Class / Patent application number | Description | Number of patent applications / Date published |
701062000 | Fail-safe control (e.g., preventing a gear shift) | 50 |
20080215218 | Control Device For Automatic Transmission - ECU executes a program including the step (S | 09-04-2008 |
20080221763 | VEHICLE TRANSMISSION SHIFT INHIBIT METHOD AND APPARATUS - A control method is provided including detecting transmission output speed and a forward and reverse shift request, and executing inhibit limits when the detected speed exceeds a predetermined threshold speed. The inhibit limits slow the output speed to zero upon detection of a shift request at output speeds above the threshold, with a pedal progression map executed upon reaching zero output speed. The limits approach zero output torque as vehicle speed increases, reaching zero at a relatively high speed and simulating a neutral transmission upon a detected shift request at high speed. A vehicle is also provided having a transmission, a sensor for detecting transmission output speed, a sensor for detecting a shift request, and a PCM having an algorithm and a threshold transmission output speed. The algorithm inhibits a shift event in the direction opposite that of vehicle travel upon detection when vehicle speed is greater than the threshold. | 09-11-2008 |
20090005943 | Vehicle Speed Control System and Straddle-Type Vehicle - A vehicle speed control system for a vehicle including a failure detector configured to determine whether or not a failure occurs in the vehicle, a vehicle speed restriction controller configured to control a driving power source to decrease a vehicle speed of the vehicle when the failure detector detects the failure, and a driving state detector configured to detect a driving state of the vehicle. The vehicle speed restriction controller is configured to determine a deceleration pattern according to the driving state detected by the driving state detector at detection of the failure. | 01-01-2009 |
20090082932 | Select Assist Device for Automatic Transmission - A control unit | 03-26-2009 |
20090082933 | SHIFT CONTROL DEVICE FOR AUTOMATIC TRANSMISSION AND CONTROL METHOD THEREOF - An automatic transmission calculates a current thermal load state of the frictional element, predicts (S | 03-26-2009 |
20090112425 | Method for Operating an Automatic Gearbox - A method of operating an automatic transmission of a motor vehicle, in particular a variable-speed transmission. The automatic transmission includes at least five shift elements, at least three of which are engaged in a forward and a reverse gear to transfer torque or force. When disengaging gears for shifting the automatic transmission from a forward or reverse gear to a neutral position, at least one of the at least three shift elements that are engaged in the respective forward or reverse gear is completely disengaged. | 04-30-2009 |
20090112426 | Method and device for detecting a malfunction of a control coupling - A method for detecting a fault in a coupling having the coupling elements that are movable against each other, which are situated between a first drive unit and a second drive unit, having the steps of providing a torque by the second drive unit, activating the coupling so that the coupling elements are moved into a position which, in the normal state of the coupling, corresponds to a touch point position which corresponds to a position of the coupling elements in which, in the normal state of the coupling, the coupling elements lie against each other, but no torque is able to be transmitted between the coupling elements, determining, after the setting in of the touch point position, whether a torque is being transmitted from the second drive unit to the first drive unit via the coupling, as well as detecting a fault in the coupling if it is determined that a certain torque is being transmitted via the coupling. | 04-30-2009 |
20090138165 | AUTOMOBILE OPERATION APPARATUS AND METHOD DESIGNED FOR FAILURE OF DRIVE GEAR OF AUTOMATIC TRANSMISSION - Provided is an automobile operation apparatus and method designed for failure of a drive gear of an automatic transmission that enable an automobile to be driven by moving only a gearshift lever when a D gear for forward driving malfunctions. The automobile operation apparatus is designed for failure of a drive gear of an automatic transmission having a normal mode constituted by P, R, N and D gears, and a sport mode. The automobile operation apparatus includes up/down switches for shifting a gear of the automatic transmission up or down when a gearshift lever is shifted from the normal mode to the sport mode, a detection means for detecting whether the gearshift lever is shifted to the sport mode, and a control means for controlling a D gear operation at the up/down switches when the D gear is abnormal and the detection means detects a mode change. Therefore, an automobile can be driven, even when a D gear for forward driving malfunctions, by a virtual drive mode switch that is equivalent to the D gear in an emergency. | 05-28-2009 |
20090292431 | CONTROL APPARATUS FOR SHIFT RANGE CHANGEOVER DEVICE - A control apparatus for a shift range changeover device determines temporary abnormality, when a detection output of a rotation position of a motor continues to be abnormal for a first abnormality determination period. The control apparatus further determines persistent abnormality and performs predetermined failsafe processing, when the detection output further continues to be abnormal for a second abnormality period following the first abnormality period. If the temporary abnormality is determined within a feedback control permission period, motor feedback control is prohibited to control the shift range to the neutral range. If the temporary abnormality is determined after the feedback control permission period, the same control operation as before the temporary abnormality is performed. | 11-26-2009 |
20090312928 | METHOD FOR MONITORING A STARTING PROCESS OF A MOTOR VEHICLE - The invention relates to a method for monitoring a starting process of a motor vehicle, having a drive train, with a driving motor, a torque transfer system, and a transmission, a controller, and an actuator controlled by the controller for actuating the torque transfer system. If a starting observer detects that, despite a clear starting request, no starting occurs, appropriate measures supporting the starting of the motor vehicle are thereupon initiated. | 12-17-2009 |
20090319145 | METHOD FOR DETECTING THE PERFORMANCE OF A SKIP SHIFT DEVICE - A skip shift device performance detecting method used to more accurately enable skip shift diagnostic execution in a manual transmission equipped vehicle where a skip shift has been requested and a transmission clutch remains engaged. Where a skip shift request ceases during clutch engagement, a timed loop is used to monitor if clutch disengagement occurs before the loop times out. Where clutch disengagement occurs before the loop times out, skip shift diagnostic execution is enabled. Where the loop times out before disengagement, skip shift diagnostic execution is disabled. Where the skip shift is requested and the clutch remains engaged, the skip shift request is monitored to determine whether it is withdrawn before clutch disengagement. If it is withdrawn before clutch disengagement, the aforementioned timed monitoring loop is executed. If it is not withdrawn before clutch disengagement, execution of the skip shift diagnostic is enabled. | 12-24-2009 |
20100042302 | METHOD FOR THE EMERGENCY ACTUATION OF AN AUTOMATED DOUBLE CLUTCH TRANSMISSION OF A MOTOR VEHICLE - A method for emergency actuation of an automated dual-clutch transmission of a vehicle with electrohydraulic control via a transmission control device. The method includes disengaging one clutch of the dual-clutch transmission, in order to realize emergency operation of the transmission and applying pressure on the other clutch after an error signal is transmitted indicating a malfunction of the transmission and/or the transmission control device. In order to keep the complexity of the hardware of the hydraulic system low, both clutches are disengaged, when an error signal occurs, and adjusted to a safe initial state, and an actuating pressure is only re-applied to one of the two clutches after the initial state is reached. In addition to the already existing elements of the hydraulic system, only one device or software is required which detects and selects the clutch that is more advantageous for continued driving operation. | 02-18-2010 |
20100082209 | HYDRAULIC CONTROL DEVICE FOR AUTOMATIC TRANSMISSION - A hydraulic control device for an automatic transmission that includes a fail-safe function to establish a fail-safe traveling state where a predetermined shift speed is established, and a fail-safe stopping state where the primary pressure to all of the hydraulic servos is cut-off when a failure occurs. The hydraulic control device is able to switch between the fail-safe traveling state and the fail-safe stopping state even after a failure occurs, thereby enhancing a limp-mode function. | 04-01-2010 |
20100145583 | SHIFT CONTROL DEVICE - In a shift control device operative to determine shift positions based on an absolute positional information related to a mechanical displacement of a shift mechanism, it is intended that the shift positions are accurately determined regardless of disturbance and deterioration with time. It is determined as to whether a varying width of a position voltage PV representing absolute positional information relative to a varying width of a pulse count number CP representing relative positional information is larger than an varying allowable range. When a state, under which difference between the both variations is larger than the varying allowable range, continues beyond a determining time T, a determination is made that persistent disturbance is existed in the position voltage PV, and a correlation between the position voltage PV and the shift positions “P”, “R”, “N” and “D” is learnt and corrected. This allows the correlation to be corrected even if a variation occurs in the position voltage PV due to for instance variations in a disturbance magnetic field or an environmental temperature, a change with time of an output characteristic of a hall element | 06-10-2010 |
20100204893 | PROCESS FOR MONITORING THE DIRECTION OF FRICTIONAL DRIVE FROM A VEHICLE TRANSMISSION AT NEAR-ZERO VEHICLE SPEED - A process of monitoring a drive direction of an automatic or automated vehicle transmission at near-zero vehicle speed via an engaged gear. A desired direction of drive of the transmission is determined from an engaged gear at the time the vehicle begins motion. An actual direction of drive is determined from the transmission and, if different from the desired direction of drive, an error signal is produced. The process includes determining the actual drive either from a sensed rotational direction of a transmission input shaft and a sensed rotational direction of a transmission output shaft or a sensed valve setting, a sensed pressure in an transmission electro-hydraulic control system or on a transmission shifting element or from a sensed direction of rotation of a transmission gearset element or from axial movement or force of a transmission constructional element. | 08-12-2010 |
20100222974 | CONTROL APPARATUS AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION - An ECU executes a program including the step (S | 09-02-2010 |
20100318271 | CONTROL SYSTEM FOR AUTOMATIC TRANSMISSION - A control system for an automatic transmission that does not require a cut-off valve, and that can inhibit a reverse control even if a detection unit for detecting a shift range fails. The control system includes a first friction engagement element, which is engaged in predetermined forward and reverse shift speeds, a detection unit that detects a shift range from shift ranges that include a forward range and a reverse range; a failure judgment unit for judging failure of the detection unit, and an avoidance unit for shifting to a forward shift speed that does not engage the first friction engagement element if the failure judgment unit determines that the detection unit has failed. | 12-16-2010 |
20100324792 | METHOD FOR BLOCKING INADMISSIBLE GEAR SHIFTS IN A TRANSMISSION AND SHIFT ASSEMBLY FOR A TRANSMISSION - A method of blocking inadmissible gearshift processes in a transmission with a plurality of shifting devices which, in order to carry out a shift process, are moved by actuating devices when a shift command is sent by a control unit to the relevant actuating device. The actuating devices exchange data with one another and the control unit such that the actuating device of the shifting device to be shifted is activated only if clearance is given by at least another actuating device. In a transmission with a control unit and a plurality of actuating devices for the actuation of shifting devices, the actuating devices are associated with at least one shaft and connected for data exchange with one another and with the control unit such that the actuating device of the shifting device to be shifted can be activated provided that clearance has been given by at least one other actuating device. | 12-23-2010 |
20100332093 | VEHICLE CONTROL UNIT AND VEHICLE EQUIPPED WITH THE SAME - A vehicle control unit and a vehicle equipped with the vehicle control unit are provided, the vehicle control unit being capable of preventing a breakdown of a vehicle caused by an erroneous operation upon carrying out a departure operation. In a vehicle control unit for controlling a vehicle on the basis of a detection signal obtained from a shift range detecting unit configured to detect a shift range selected by a shift operating unit, a vehicle speed detecting unit configured to detect a vehicle speed, and an engine rpm detecting unit configured to directly or indirectly detect an engine rpm, when the vehicle speed detecting unit detects that a vehicle speed is less than a reference vehicle speed V | 12-30-2010 |
20110010064 | SHIFT-BY-WIRE FAIL CONTROL DEVICE FOR VEHICLE WITH AUTOMATIC TRANSMISSION - A shifting apparatus includes an actuator to direct a travel range setting of a vehicle transmission, a selector to indicate a desired travel range setting, a transmission controller to move the actuator into the travel range setting in response to the desired travel range setting of the selector, and a restrictor to restrict an output of a drive motor if the vehicle transmission is in a travel range setting other than the desired travel range setting. A method to control a vehicle transmission includes detecting a travel range setting of the vehicle transmission, detecting a desired travel range setting of a selector, and entering a limp-home mode if the detected travel range setting is different from the desired travel range setting and a detected vehicle travel direction corresponding to the detected travel range setting is the same as a desired travel direction corresponding to the desired travel range setting. | 01-13-2011 |
20110137533 | METHOD FOR CONTROLLING TCU FAIL-SAFE USING ELECTRONIC SHIFT LEVER - The present invention relates to a method for controlling a TCU fail-safe using an electronic shift lever. A failure state of TCU is verified through CAN BUS (serial communication, or hardware wire) using an electronic shift lever unit, and a parking sprag is forcibly unlocked from a parking gear by pulling an override cable for parking by the an electronic shift lever unit when TCU being in the failure state, so that the implementation of fail-safe according to a failure of TCU is accomplished with higher control stability than using a transmission and without an addition of a component or a change of design. | 06-09-2011 |
20110137534 | SHIFTING RANGE SENSING APPARATUS - A shifting range sensing system, may include a shift lever pivotally connected to a vehicle body, a shift range sensing apparatus to sense a pivotal movement of the shift lever, an inhibitor switch mounted in a transmission, and a controller taking an emergency measure when a signal of the inhibitor switch and a signal of the shifting range sensing apparatus do not indicate the same shifting range. | 06-09-2011 |
20130066529 | VEHICLE DRIVE DEVICE - In a vehicle drive device including a transmission mechanism | 03-14-2013 |
20130080008 | CONTROL DEVICE OF VEHICLE CONTINUOUSLY VARIABLE TRANSMISSION - A control device of a vehicle continuously variable transmission, includes a pair of variable pulleys consisting of an input-side variable pulley and an output-side variable pulley whose effective diameters are variable; a transmission belt wound around the pair of variable pulleys; an electromagnetic valve that controls an oil pressure fed to prevent a slip of the transmission belt; and an oil pressure sensor that detects the oil pressure controlled by the electromagnetic valve, wherein a sensor failure determination for determining whether a failure occurs in the oil pressure sensor is executed after execution of an electronic valve failure determination for determining whether a failure occurs in the electromagnetic valve. | 03-28-2013 |
20130151095 | Method and System for Providing a Neutral Hold Mode in a Shift-by-Wire Transmission - A method and system provides a Neutral Hold mode in a vehicle having a shift-by-wire transmission with a return to park feature. The Neutral Hold mode is entered upon detecting when the transmission control mechanism has been used a first time to select Neutral when a driver's door is open or has been used a second time to select Neutral. When in Neutral Hold mode, the transmission will stay in Neutral and not shift to Park upon detecting that a driver has exited the vehicle. | 06-13-2013 |
20130151096 | Method and System for Providing a Neutral Tow Mode in a Shift-by-Wire Transmission - A method and system provides a Neutral Tow mode in a vehicle with a shift-by-wire transmission by displaying a Neutral Tow mode option when the transmission control mechanism has been used to select Park, an ignition switch is on, and an engine is off or an information button has been pushed and entering a Neutral Tow mode upon detecting a triggering event. The Neutral Tow mode is canceled upon detecting a certain sequence of events, such as turning on the ignition switch, depressing and holding a brake pedal, and selecting Park. When in Neutral Tow mode the transmission will stay in Neutral, without automatically shifting to Park or using battery power, thereby enabling the vehicle to be towed long distances without draining battery power. | 06-13-2013 |
20130151097 | Method and System for Providing a Voting Strategy for Determining a Mode State in a Shift-by-Wire Transmission - A voting strategy is used to determine the mode state of a transmission when a vehicle is restarted. A Powertrain Control Module, a Transmission Range Control Module, and a Gear Shift Module communicate through a communication network during execution of the voting strategy. Each module stores a remembered mode state (Normal, Neutral Hold, Neutral Tow, etc.) of the transmission in non-volatile memory. Upon module initialization, the Powertrain Control Module will compare its own remembered mode state of the transmission with the remembered mode state reported by the other two modules. A basic voting strategy is that if two of the three modules report the same remembered mode state then the Powertrain Control Module changes the transmission to that same mode state. | 06-13-2013 |
20130218430 | FAIL-TO-NEUTRAL SYSTEM AND METHOD FOR TOROIDAL TRACTION DRIVE AUTOMATIC TRANSMISSION - A fail-to-neutral diagnostic technique for a transmission that includes a variator may include monitoring a state of a pressure differential valve fluidly coupled to a high side pressure applied to at least one actuator coupled to at least one corresponding roller of the variator and also fluidly coupled to a low side pressure applied to the at least one actuator, determining from the state of the pressure differential valve a variator torque sign corresponding to whether torque transferred by the at least one roller is positive or negative, determining an expected variator torque sign based on current operating conditions of the transmission, and commanding the transmission to a true neutral condition if the determined variator torque sign is different from the expected variator torque sign. | 08-22-2013 |
20130261913 | SAFETY CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION AND METHOD FOR CONTROLLING AUTOMATIC TRANSMISSION - A safety control apparatus for an automatic transmission includes a speed range detector, an oil temperature detector, a vehicle speed detector, a speed-range shifting device, a shift inhibiting device, and a maximum-speed limiting device. The shift inhibiting device is configured to inhibit an automatic downshift and a manual downshift by a driver if the speed-range shifting device performs a forcible upshift. The maximum-speed limiting device is configured to limit a maximum vehicle speed to a third vehicle speed if an oil temperature reaches a second oil temperature which is higher than a first oil temperature and if a vehicle speed is not lower than a second vehicle speed which is higher than a first vehicle speed. | 10-03-2013 |
20130275016 | AUTOMATIC TRANSMISSION CONTROL APPARATUS - The present invention provides an automatic transmission control apparatus which comprises a first temperature detection device for detecting a temperature of hydraulic oil stored in an automatic transmission; an automatic transmission control device installed in a same casing as that in which the hydraulic oil is stored; a second temperature detection device for detecting a temperature of the automatic transmission control device; and a malfunction determination section for comparing the temperature of the automatic transmission control device detected by the second temperature detection device with the temperature of the hydraulic oil detected by the first temperature detection device to determine whether or not a malfunction occurs in the first temperature detection device. | 10-17-2013 |
20130317714 | CONTROL DEVICE AND CONTROL METHOD FOR SPEED CHANGE DEVICE - One of two clutches etc. engaged concurrently with each other to establish a second speed, a third speed, or a fourth speed is determined in advance as an abnormal-time engagement element that is kept engaged when an abnormality occurs in which one different clutch or brake is engaged during concurrent engagement of the two clutches etc. The other of the two clutches etc. is determined in advance as an abnormal-time slipping element that is caused to slip when such an abnormality occurs. During concurrent engagement of the two clutches etc., a hydraulic pressure (target hydraulic pressure) to be supplied to the abnormal-time engagement element is set to be higher than a hydraulic pressure (target hydraulic pressure) to be supplied to the abnormal-time slipping element. | 11-28-2013 |
20130338891 | REDUNDANT CONTROLS FOR A MULTI-MODE TRANSMISSION - A transmission includes an electro-hydraulic controller that includes redundancy in the hydraulic circuit that permits single fault failures to be compensated for by changing the flow path of hydraulic fluid to bypass the single fault failure. The redundancy results in the ability of the transmission to maintain full operation in all modes. | 12-19-2013 |
20140074367 | FAIL-TO-NEUTRAL SYSTEM AND METHOD FOR A TOROIDAL TRACTION DRIVE AUTOMATIC TRANSMISSION - A fail-to-neutral diagnostic technique for a transmission that includes a variator may include monitoring a state of a pressure differential valve fluidly coupled to a high side pressure applied to at least one actuator coupled to at least one corresponding roller of the variator and also fluidly coupled to a low side pressure applied to the at least one actuator, determining from the state of the pressure differential valve a variator torque sign corresponding to whether torque transferred by the at least one roller is positive or negative, determining an expected variator torque sign based on current operating conditions of the transmission, and commanding the transmission to a true neutral condition if the determined variator torque sign is different from the expected variator torque sign. | 03-13-2014 |
20140303861 | VEHICLE CONTROL APPARATUS - A vehicle control device includes: a first calculation processing portion outputting a calculation result based on an input value; and a second calculation processing portion acquiring the same input value as the input value of the first calculation processing portion, the second calculation processing portion detecting an abnormality of the first calculation processing portion based on comparison between the input value of the second calculation processing portion and the calculation result of the first calculation processing portion or based on whether the calculation result is a predefined highly safe state value at which a relatively high safety state of a vehicle is acquired. | 10-09-2014 |
20150321551 | ELECTRONIC SHIFTER LIMP-HOME TECHNIQUES - Limp-home techniques for situations when an electronic shifter of a vehicle malfunctions include detecting, at a controller of the vehicle, a malfunction of the electronic shifter of the vehicle, the electronic shifter being configured to control shifting of a transmission of the vehicle in response to a gear control input provided by operation of the electronic shifter. The techniques include, in response to detecting the malfunction of the electronic shifter, receiving, at the controller, the gear control input from actuation of the one or more actuators of a steering wheel of the vehicle. The techniques also include controlling, by the controller, shifting of the transmission in response to the gear control input received from the one or more actuators of the steering wheel. | 11-12-2015 |
20150377345 | Apparatus for Controlling an Automatically Shifting Transmission - The apparatus suppresses manual shifting options in an electronically controlled automatic transmission with a manual mode in the active transportation mode of a motor vehicle by appropriate programming of an electronic transmission control unit. The transmission can be operated only in the automatic mode. Preferably, only the forward gears can be selected in this case, the weakest shift element, in particular the weakest brake or clutch in an automatic transmission, always being closed in the forward gears. | 12-31-2015 |
20160017986 | AUTOMATIC TRANSMISSION FAILURE DETERMINATION APPARATUS - In an apparatus for determining failure of a double-clutch automatic transmission having a line pressure-regulating valve, pressure-regulating valves and select valves, it is determined whether the pressure regulated by the line pressure-regulating valve is equal to or greater than a predetermined pressure and it is determined that the line pressure-regulating valve has failed if the pressure regulated by the line pressure-regulating valve is determined to be less than the predetermined pressure, whereas it is determined that one from among the pressure-regulating valves and select valves has failed if the pressure regulated by the line pressure-regulating valve is determined to be equal to or greater than the predetermined pressure. | 01-21-2016 |
20160017990 | APPARATUS FOR DETECTING ABNORMAL HYDRAULIC PRESSURE OF AUTOMATIC TRANSMISSION - In an apparatus for detecting abnormal hydraulic pressure of an automatic transmission having first and second input shafts that input rotation of an engine through first and second clutches and an idler shaft that inputs the rotation through a third clutch, and equipped with a hydraulic pressure supply circuit having a first pressure-regulating valve that generates line pressure, a line pressure-regulating valve that controls operation of the first pressure-regulating valve based on a line pressure command value, and first, second and third hydraulic pressure detectors that detect the hydraulic pressures of first, second and third oil passages respectively, it is determined whether abnormality that makes the high pressure abnormally high has occurred in the line pressure-regulating valve based on the hydraulic pressures detected by at least one of the first, second and third hydraulic pressure detectors and a line pressure command value, when predetermined operating conditions of the vehicle are satisfied. | 01-21-2016 |
20160053887 | TRANSMISSION WITH ELECTRONIC RANGE SELECTOR AND PRE-EMPTIVE POWER LOSS CONTROL LOGIC - A vehicle includes an engine, a transmission with a shift valve, an alternator, an auxiliary battery, a voltage sensor operable to measure an auxiliary voltage, and an electronic transmission range selection (ETRS) system. The ETRS system includes a controller, and also an electronic range selector device that transmits an electronic range request signal to the controller to request the shift of the transmission to a requested operating range. The controller executes a method to predict a loss of auxiliary power aboard the vehicle, and to control an action of the vehicle in response to the predicted loss of auxiliary power. The electronic range request signal is received from the range selector device and auxiliary voltage. The controller calculates a slope of a decrease in the measured auxiliary voltage. A control action is executed with the alternator is in the charging state and the calculated slope exceeds a calibrated slope threshold. | 02-25-2016 |
20160076643 | TRANSMISSION NODE SPEED MONITORING - A method for monitoring a fixed-gear transmission includes deriving a node speed relationship for each of the planetary gear sets based upon a center distance and a gear ratio and determining equivalent speed parameters for nodes of the planetary gear sets based upon a transmission input speed state, an intermediate node speed state and a transmission output speed state. A clutch slip speed relationship is determined for each of the clutches based upon the node speed relationships for the planetary gear sets and the equivalent speed parameters for nodes of the planetary gear sets. Rotational speed sensors monitor the input transmission speed, the intermediate node speed and the transmission output speed. A clutch slip speed for each of the clutches is determined based upon the respective clutch slip speed relationship and the monitored input transmission speed, the monitored intermediate node speed and the monitored transmission output speed. | 03-17-2016 |
20160102758 | Method for Detecting a Nonoperational Shift Element in an Automatic Transmission - A method for detecting a malfunctioning shift element in an automatic transmission is provided. The method includes operating the automatic transmission in an intermediate gear. A selected shift element of the automatic transmission is commanded to a disengaged configuration in the intermediate gear. The method also includes measuring a gear ratio of the automatic transmission while the automatic transmission is operating in the intermediate gear, and determining whether the selected shift element of the automatic transmission is malfunctioning based at least in part on the gear ratio of the automatic transmission in the intermediate gear. | 04-14-2016 |
20160138708 | METHOD OF CHECKING ABNORMALITY IN OIL PRESSURE OF TCU - A method of checking an abnormality in oil pressure of a transmission control unit (TCU) may include determining whether an oil pressure signal transmitted from the TCU to an electric oil pump (EOP) device is normal, transmitting a specific oil pressure value to the EOP device, the specific oil pressure value being set for determining whether the oil pressure signal transmitted from the TCU is normal, determining whether an oil pressure corresponding to the specific oil pressure value is sensed at the EOP device, determining whether a decrease range of the oil pressure sensed at the EOP device belongs within a predetermined range when compared to the specific oil pressure value, and determining whether to perform abnormality control over a transmission by operating the EOP device at set minimum revolutions per minute when the decrease range of the oil pressure sensed at the EOP device is beyond the predetermined range. | 05-19-2016 |
20160144862 | METHOD AND SYSTEM FOR CONTROLLING A VEHICLE POWERTRAIN - The invention relates to a method of controlling a vehicle powertrain including determining that a performance feature associated with the powertrain is outside of a desired performance range. A plurality of operation parameters that are associated with the powertrain are identified that have a relationship to the performance feature. An adjustment is automatically made to at least one of the identified operation parameters to thereby bring the performance feature closer to the desired performance range. Preferably, the relationship comprises a mathematical model that corresponds to how the operation parameters influence whether the performance feature is within the desired performance range, the method further comprising identifying an actuator failure associated with the powertrain; determining at least one of the operation parameters corresponding to the actuator failure; determining a value of the corresponding operation parameter that is indicative of the actuator failure; and using the determined value as a fixed value for the corresponding operation parameter in the mathematical model. | 05-26-2016 |
20160153552 | DIAGNOSTIC METHOD FOR SHIFTING ACTUATOR OF TRANSMISSION | 06-02-2016 |
701063000 | Responsive to faulty sensor | 6 |
20080221764 | AUTOMATIC TRANSMISSION AND CONTROL METHOD THEREOF - In an automatic transmission of this invention, a determination as to whether or not a failure has occurred in a friction element is made repeatedly while a vehicle is traveling, and control to specify the failed friction element is begun when a vehicle speed falls to or below a predetermined value for the first time following detection of the failure in the friction element (S | 09-11-2008 |
20110040463 | METHOD AND SYSTEM FOR CALIBRATING A PRESSURE SENSOR FOR AN AUTOMATIC TRANSMISSION - A method and control system for operating a transmission includes a transmission control module determining a transmission sensor signal and a transmission pressure sensor offset prior to starting a vehicle engine and an engine start initiator starting the vehicle engine. The transmission control module controls a transmission function in response the transmission pressure sensor offset and the pressure sensor signal. | 02-17-2011 |
20130080009 | SYSTEM AND METHOD FOR ESTIMATING HYDRAULIC PRESSURE WITHIN AND CONTROLLING A DRY DUAL CLUTCH TRANSMISSION - A control system for a dry dual clutch transmission (DCT) includes first, second, and third modules. The first module detects whether a hydraulic pressure sensor of a hydraulic fluid delivery system in the dry DCT has failed. The second module estimates a pressure of hydraulic fluid within an accumulator of the hydraulic fluid delivery system based on one of (i) torque generated by and temperature of a hydraulic fluid pump and (ii) a drain down period of the accumulator and a period since the hydraulic fluid pump was on. The third module controls start/stop of the hydraulic fluid pump based on the estimated hydraulic fluid pressure when the hydraulic pressure sensor has failed. | 03-28-2013 |
20130317715 | Control Device for Vehicle - An ECU determines whether or not there is an abnormality (shift pattern abnormality) in a combination of shift signals provided from a shift position sensor. After occurrence of the shift pattern abnormality is determined, the ECU determines whether or not a first condition that a shift pattern changes into a normal pattern of a drive range is satisfied, and whether or not a second condition that a vehicle is running (a driver has an intention to cause the vehicle to run) is satisfied. When occurrence of the shift pattern abnormality is determined, the ECU stops generation of driving force of the vehicle and prohibits switching to the drive range. When the above-mentioned first condition and second condition are satisfied after occurrence of the shift pattern abnormality is determined, the ECU switches the shift range to the drive range indicated by the shift pattern and recovers the driving force. | 11-28-2013 |
20130325275 | CONTROL DEVICE FOR VEHICLE - An ECU determines whether or not there is an abnormality (shift pattern abnormality) in a combination of shift signals provided from a shift position sensor. After occurrence of the shift pattern abnormality is determined, ECU determines whether or not a first condition that a shift pattern has changed into a normal pattern of a drive range, a second condition that a brake is ON and a vehicle is in a stop state is satisfied, and a third condition that an accelerator is OFF satisfied. When occurrence of the shift pattern abnormality is determined, ECU stops generation of driving force of the vehicle and prohibits switching to the drive range. When ECU determines that the above-mentioned first to third conditions are satisfied after occurrence of the shift pattern abnormality is determined, ECU switches the shift range to the drive range indicated by the shift pattern. | 12-05-2013 |
20160017987 | AUTOMATIC TRANSMISSION FAILURE DETERMINATION APPARATUS - In an apparatus for determining failure of an automatic transmission having gear engaging mechanisms that engage one of gears to input shafts and an output shaft to establish one of speeds corresponding to the engaged one of the gears, a first to third pressure-regulating valves, a first and second shift valves, the solenoid valve is energized to output clutch pressure to the one of the gear engaging mechanisms through the first oil passage when the clutch pressure is less than a prescribed pressure, determines whether the one of the gear engaging mechanisms operates based on output of an operating state detector, determines that the second pressure-regulating valve has failed when the one of the gear engaging mechanisms is determined to be inoperative, whereas determines that at least one of the solenoid valve and a pressure detector has failed when the one of the gear engaging mechanisms is determined to be operative. | 01-21-2016 |