Patent application number | Description | Published |
20090248233 | AUTOMATIC TRANSMISSION CONTROLLER AND AUTOMATIC TRANSMISSION CONTROL METHOD - An automatic transmission controller calculates a predicted vehicle speed with reference to a measured vehicle state variable, and calculates a target transmission ratio with reference to the predicted vehicle speed, when a sensor input signal is normal which carries information about the measured vehicle state variable. The automatic transmission controller calculates the predicted vehicle speed with reference to a first alternative value instead of the measured vehicle state variable, and calculates the target transmission ratio with reference to a second alternative value instead of the predicted vehicle speed, when the sensor input signal is abnormal. The automatic transmission controller restarts calculation of the predicted vehicle speed with reference to the measured vehicle state variable, when the sensor input signal becomes normal, and restarts calculation of the target transmission ratio with reference to the predicted vehicle speed, when a predetermined condition is satisfied after the sensor input signal becomes normal. | 10-01-2009 |
20090306865 | AUTOMATIC TRANSMISSION AND CONTROL METHOD THEREOF - In an automatic transmission that performs a shift on the basis of a shift map defined by a vehicle speed Vsp and a throttle opening TVO, when the vehicle speed Vsp and the throttle opening TVO exist within a 6-7 special region, which is located within a sixth speed gear position region of the shift map and defined by a downshift line at which a downshift is performed from a seventh speed gear position serving as a maximum gear position to the sixth speed gear position and a minimum vehicle speed of an upshift line at which an upshift is performed from the sixth speed gear position to the seventh speed gear position, and this condition continues for a predetermined time period, a shift is performed to the seventh speed. | 12-10-2009 |
20110054751 | CONTROL DEVICE AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION - A control device for an automatic transmission having a torque converter includes: a determining means for determining whether to set a friction element in an engaged condition or a disengaged condition on the basis of an operating condition of a vehicle; a control means for outputting an engagement command or a disengagement command on the basis of a determination result of the determining means; and an oil pressure control means for performing control to engage the friction element upon reception of the engagement command by performing a precharge control for the friction element and then controlling the supplied oil pressure to a predetermined oil pressure and to disengage the friction element upon reception of the disengagement command by draining the oil pressure supplied to the friction element, wherein the control means comprises a prohibiting means for prohibiting output of the disengagement command in relation to the friction element following control of the friction element from the disengaged condition to the engaged condition until a predetermined condition is established. | 03-03-2011 |
20110054755 | CONTROL DEVICE AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION - A control device for an automatic transmission includes a determining unit determines that a friction element is to be set in an engaged condition in case a vehicle speed is equal to or higher than a determination reference and determining that the friction element is to be set in a disengaged condition in case the vehicle speed is lower than the determination reference, and a engagement control unit that performs control to engage or disengage the friction element on the basis of a determination result of the determining unit, wherein the engagement control unit comprises a prohibiting unit that prohibits setting of the friction element in the engaged condition until a predetermined condition is established, regardless of the determination result, after the friction element has been modified from the engaged condition to the disengaged condition. | 03-03-2011 |
20120035817 | IDLE STOP VEHICLE AND CONTROL METHOD THEREOF - An idle stop vehicle performs an idle stop to automatically stop an engine during a stop of the vehicle. The vehicle includes an idle stop condition determination unit for determining whether or not an idle stop condition holds, and an engine control unit for performing the idle stop when the idle stop condition holds before a stoppage time exceeds a specified time and prohibiting the idle stop after the stoppage time exceeds the specified time without the idle stop condition holding. | 02-09-2012 |
20120059571 | ENGINE AUTO-STOP VEHICLE AND CONTROL METHOD THEREFOR - A controller actuates an electrical oil pump when an idle stop condition or a coast stop condition holds and causes the actuation of the electrical oil pump to continue without being stopped until an accelerated state of a vehicle or a driver's intention to accelerate is determined even if the idle stop condition and the coast stop condition no longer holds thereafter. | 03-08-2012 |
20120060485 | HYDRAULIC CONTROL DEVICE, CONTROL METHOD OF THEREOF, AND AUTOMATIC TRANSMISSION - A hydraulic control device includes an oil pump for generating a hydraulic pressure by being rotated by power of a driving force source, a driving force source stopping unit that stops rotation of the driving force source when a predetermined condition holds, and a cut-off unit that cuts off transmission of the power from the driving force source to the oil pump when the driving force source rotates in a reverse direction as the rotation of the driving force source is stopped by the driving force source stopping unit. | 03-15-2012 |
20120060486 | HYDRAULIC CONTROL DEVICE, CONTROL METHOD OF THEREOF, AND AUTOMATIC TRANSMISSION - A hydraulic control circuit includes an oil pump for generating a hydraulic pressure by being rotated by power of a driving force source, a line pressure oil passage in which at least a line pressure generated by adjusting the hydraulic pressure generated by the oil pump is supplied, a driving force source stopping unit that stops the rotation of the driving force source, and a hydraulic pressure reduction suppressing unit that is provided in the line pressure oil passage and suppresses a reduction of the line pressure accompanying reverse rotation of the driving force source when the rotation of the driving force source is stopped by the driving force source stopping unit. | 03-15-2012 |
20120083388 | COAST STOP VEHICLE AND CONTROL METHOD THEREOF - A coast stop vehicle which stops an engine during the travel of the vehicle is provided with a variator including a pair of pulleys and a belt mounted between the pulleys and capable of continuously changing a speed ratio. A controller judges whether or not coast stop conditions to stop the engine during the travel of the vehicle hold, stops the engine when the coast stop conditions hold, and prevents the speed ratio from being upshifted to a higher side than a speed ratio at the time of starting the coast stop control during the coast stop control. | 04-05-2012 |
20120088629 | COAST STOP VEHICLE AND COAST STOP METHOD - A coast stop vehicle includes a variator which continuously changes a speed ratio by changing a winding diameter of a belt mounted on pulleys, a sub-transmission mechanism connected in series with the variator and shifting discrete gear positions by changing engaged states of a plurality of frictional engagement elements, and a coast stop unit which stops the rotation of the drive power source and releases the engaged frictional engagement element when the coast stop condition holds during travel. The coast stop unit includes a coast stop prohibiting unit which prohibits the coast stop regardless of the coast stop condition when it is predicted at the time of determining whether or not the coast stop condition holds that a belt tightening force of the pulley falls below an engaging force of the frictional engagement element in the engaged state by the execution of the coast stop. | 04-12-2012 |
20120135839 | CONTROLLER OF VEHICLE AND CONTROL METHOD OF VEHICLE - A controller of a vehicle, provided with a coast stop control unit which automatically stops an engine during the travel of a vehicle if coast stop conditions are met during the travel of the vehicle, and the coast stop control unit automatically stops the engine at least if a change amount of acceleration of the vehicle caused by the automatic stop of the engine is predetermined acceleration or less. | 05-31-2012 |
20120135840 | COAST STOP VEHICLE AND CONTROL METHOD FOR COAST STOP VEHICLE - A coast stop vehicle, includes an engine, a transmission arranged between the engine and drive wheels and having a plurality of gear positions, a coast stop starting unit which automatically stops the engine when a coast stop start condition holds during travel, a coast stop releasing unit which automatically starts the engine when a coast stop release condition holds during a coast stop, and a downshifting unit which starts engagement of a frictional engagement element, which realizes a lower gear position than the one when the coast stop release condition holds, before complete explosion of the engine and causes a downshift of the transmission when the coast stop release condition holds. | 05-31-2012 |
20120135841 | COAST STOP VEHICLE AND CONTROL METHOD FOR COAST STOP VEHICLE - A coast stop vehicle includes a hydraulic pressure supplying unit which supplies a hydraulic pressure to the transmission while the engine is stopped, a coast stop start condition judging unit which judges whether or not a coast stop start condition holds, a coast stop control unit which stops the engine when the coast stop start condition is judged to hold by the coast stop start condition judging unit and starts the engine when receiving an acceleration request from a driver during the coast stop, a transmission control unit which causes a downshift of the transmission when receiving the acceleration request from the driver during the coast stop, and a hydraulic control unit which supplies the hydraulic pressure to an after-shift frictional engagement element which realizes a gear position after the downshift of the transmission during the coast stop. | 05-31-2012 |
20120142494 | COAST STOP VEHICLE AND CONTROL METHOD THEREOF - A coast stop vehicle which executes coast stop control for stopping an engine during the travel of a vehicle, is provided with a frictional engagement element provided between the engine and a driving wheel, a first deceleration calculating unit which calculates first deceleration, which is rotation deceleration of a rotation shaft on the driving wheel side of the frictional engagement element, and an engagement-state control unit which controls an engagement state of the frictional engagement element so that decrease of the engine rotation speed is suppressed on the basis of the first deceleration while the coast stop control is executed. | 06-07-2012 |
20130150208 | COAST STOP VEHICLE AND CONTROL METHOD FOR COAST STOP VEHICLE - A coast stop vehicle for automatically stopping a drive source when a predetermined condition holds during the travel of the vehicle includes a drive source control unit adapted to control the automatic stop and the restart of the drive source, a transmission mechanism provided between the drive source and drive wheels, and a transmission control unit adapted to control a speed ratio of the transmission mechanism. When the drive source is restarted, the transmission control unit is adapted to control the transmission mechanism to a speed ratio higher than a predetermined speed ratio in response to an input shift request to the predetermined speed ratio, and the drive source control unit is adapted to restart the drive source in a state where the speed ratio of the transmission mechanism is higher than the predetermined speed ratio. | 06-13-2013 |
20130260929 | CONTROL DEVICE AND CONTROL METHOD FOR CONTINUOUSLY VARIABLE TRANSMISSION - The present invention is provided with a hydraulic control circuit including a hydraulic pump driven by a driving power source in order to supply an oil pressure to a hydraulic circuit, a hydraulic auxiliary unit for supplying an accumulated oil pressure to the hydraulic circuit, and a control valve for supplying at least one of oil pressures of the hydraulic pump and the hydraulic auxiliary unit to pulleys, and a control unit for executing a coast stop control to stop the driving power source while traveling and controlling, when an increase of torque inputted to the continuously variable transmission is detected or predicted during the coast stop control, the control valve so as to supply an oil pressure of the hydraulic auxiliary unit to the pulleys. | 10-03-2013 |
20130260960 | CONTROL DEVICE AND CONTROL METHOD FOR CONTINUOUSLY VARIABLE TRANSMISSION - A control device for continuously variable transmission is composed of a continuously variable transmission mechanism and friction engagement elements, and includes a control unit for decreasing, during a coast stop control to stop a driving power source in a traveling state of a vehicle, a transmission torque capacity transmittable by the friction engagement elements to fall under a belt capacity being torque transmittable by a belt using a holding force of pulleys. | 10-03-2013 |
20140106933 | COAST STOP VEHICLE - A coast stop vehicle for stopping a drive source during vehicle running includes a power transmission means arranged between the drive source and drive wheels, a coast stop control means for executing a coast stop control to stop the drive source when a coast stop condition for stopping the drive source holds during the vehicle running, an electrical oil pump for supplying oil to the power transmission means during the coast stop control, a slip detection means for detecting a slip in the power transmission means during the coast stop control, and an electrical oil pump control means for causing the electrical oil pump to discharge a second discharge pressure higher than a first discharge pressure set before the slip in the power transmission means occurs when the slip occurs in the power transmission means during the coast stop control. | 04-17-2014 |