Patent application number | Description | Published |
20120088630 | SYSTEM AND METHOD FOR CONTROLLING AN AUTOMATIC ENGINE STOP-START - A system and method for controlling automatic stop-start of a motor vehicle is provided. The system and method is configured to enable an automatic stop-start mode of operation based on vehicle conditions. In addition, the system and method is configured to selectively actuate an accumulator to prime the transmission for a smooth restart. | 04-12-2012 |
20120088631 | SYSTEM AND METHOD FOR CONTROLLING AN AUTOMATIC ENGINE STOP-START BASED ON TRANSMISSION CONDITIONS - A system and method for controlling automatic stop-start of a motor vehicle is provided. The system and method is configured to disable an automatic stop-start mode of operation based on accumulator pressure conditions. | 04-12-2012 |
20120088632 | SYSTEM AND METHOD FOR CONTROLLING AN AUTOMATIC ENGINE RESTART - A system and method for controlling automatic stop-start of a motor vehicle is provided. The system and method is configured to enable an automatic stop-start mode of operation that minimizes clutch fill during engine restart. | 04-12-2012 |
20120089306 | PRESSURE REGULATION METHOD FOR AN AUTOMATIC TRANSMISSION - A transmission control system for a vehicle includes a transmission control module (TCM), a solenoid valve, a pressure regulator valve, and a transmission element. The TCM includes a control algorithm providing output signals to valve drive electronics, where the valve drive electronics supply current to the solenoid valve. The solenoid valve controls an output pressure located in a passage between the pressure regulator valve and the transmission element. During an engine start-up condition of the vehicle, the control algorithm of the TCM includes control logic for activating a solenoid adjustment algorithm. The solenoid adjustment algorithm decreases the sensitivity of the valve drive electronics when supplying current to the solenoid valve. The solenoid adjustment algorithm is activated for a predetermined amount of time after engine start-up, and is then terminated. Alternatively, the solenoid adjustment algorithm is activated until a vehicle operating condition reaches a particular value, and is then terminated. | 04-12-2012 |
20130047759 | MULTI-SPEED TRANSMISSION WITH AN ENGINE START/STOP ENABLER - A transmission includes an input member, an output member, a plurality of torque-transmitting mechanisms that are selectively engageable to establish at least four forward speed ratios and at least one reverse speed ratio between the input member and the output member, and one or more latches associated with one or more of the torque-transmitting mechanisms. The one or more latches engages the respective torque-transmitting mechanisms during or prior to a start event. | 02-28-2013 |
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 |
20130116898 | SYSTEM AND METHOD FOR CONTROLLING AN AUTOMATIC ENGINE STOP-START ACCUMULATOR - A system and method for controlling automatic stop-start of a motor vehicle is provided. The system and method is configured to enable an automatic stop-start mode of operation based on vehicle conditions. In addition, the system and method is configured to selectively actuate an accumulator to prime the transmission for a smooth restart. | 05-09-2013 |
20130232962 | HYDRAULIC CONTROL FOR A VEHICLE POWERTRAIN - A hydraulic control system and method for controlling a hydraulic system of a vehicle powertrain is provided, which includes an accumulator arranged to accumulate fluid when an engine is turned on, to retain fluid when the engine is turned off, and to discharge fluid to the transmission when the engine is restarted. The accumulator is actively filled through a controlled valve, and it may also be filled passively, for example, via ball check-valve. The method of controlling the hydraulic system includes providing a fluid line pressure to the transmission by opening a fluid passage when the engine is turned on; opening a valve to actively accumulate fluid from the fluid line pressure into an accumulator; closing the valve to retain the fluid in the accumulator; and discharging the fluid from the accumulator to the fluid passage when the engine is restarted. | 09-12-2013 |
20130263584 | SYSTEM AND METHOD FOR ACCUMULATOR FLUID MIXING - A system and method for controlling an accumulator for use with a hydraulic circuit is provided. The system and method is configured to determine a set of accumulator temperature indicators and discharge and charge the accumulator as a function of the set of accumulator temperature indicators. | 10-10-2013 |
20130264164 | METHOD OF OPERATING A TORQUE CONVERTER CLUTCH - A method of operating a torque converter clutch in an engine start-stop vehicle improves launch after an auto stop event. During the autostop event, hydraulic fluid is supplied to the torque converter clutch operator through one or more solenoid valves by an auxiliary electric pump. When the prime mover is started at the conclusion of the autostop event, the torque converter clutch is thus locked, assuring rapid and sufficient torque transfer through the torque converter to the transmission and improved acceleration during vehicle launch. As the vehicle accelerates, the hydraulic pressure in the clutch operator is reduced and slip through the clutch increased to achieve a smooth launch and return to conventional torque converter operation. | 10-10-2013 |
20140011626 | MULTI-SPEED TRANSMISSION WITH AN ENGINE START/STOP ENABLER - A transmission includes an input member, an output member, a plurality of torque-transmitting mechanisms that are selectively engageable to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member, and one or more latches associated with one or more of the torque-transmitting mechanisms. The one or more latches engages the respective torque-transmitting mechanisms during or prior to a start event. | 01-09-2014 |
20140032065 | ACCUMULATOR FLUID TEMPERATURE ESTIMATION ALGORITHM - A system includes an accumulator control module that selectively releases automatic transmission fluid from an accumulator. The accumulator control module also receives a plurality of measured characteristics of the accumulator. A temperature estimation module estimates a temperature of the automatic transmission fluid within the accumulator based on at least one of the measured characteristics of the accumulator. An engine start-stop module selectively disables automatic start-stop events of an internal combustion engine based on the estimated temperature of the automatic transmission fluid within the accumulator. | 01-30-2014 |
20140046553 | SYSTEM AND METHOD FOR CONTROLLING AN ACCUMULATOR BASED ON VEHICLE CONDITIONS - A system and method for controlling an accumulator in a transmission of a motor vehicle includes the steps of determining whether the motor vehicle has been turned off, sensing at least one operating condition of the motor vehicle, and comparing the at least one operating condition to a reference condition. If the at least one operating condition of the motor vehicle fulfills the reference condition and if the motor vehicle has been turned off then the accumulator is discharged. | 02-13-2014 |
20140163845 | HYDRAULIC ACCUMULATOR FILL ESTIMATION FOR CONTROLLING AUTOMATIC ENGINE STOP/START - A method of preventing an automatic engine stop includes: determining a pressure difference between an accumulator fill volume and a fluid conduit in selective fluid communication with the accumulator fill volume; determining a change in the accumulator fill volume from the determined pressure difference; adding the change in the accumulator fill volume to a previous estimate of the accumulator fill volume to determine a current estimate of the accumulator fill volume; comparing the current estimate of the accumulator fill volume to a predetermined threshold; and preventing an automatic engine stop if the current estimate of the accumulator fill volume is below the predetermined threshold. | 06-12-2014 |