摘要:
A method for controlling torque transmitted between an internal combustion engine and a torque transmission device includes controlling actuation of a torque converter clutch device effective to maintain an engine output within a predetermined range when an input to the transmission is less than a threshold, and controlling actuation of the torque converter clutch device effective to maintain a relative speed across the torque converter substantially at a predetermined magnitude when the input to the transmission is greater than the threshold.
摘要:
A method and apparatus are provided for controlling actuation of a clutch device for a torque converter operative to transmit torque between an engine and a transmission. The method comprises controlling actuation of the clutch device effective to maintain an engine speed within a predetermined speed range when a transmission input speed is less than a threshold; and, controlling actuation of the clutch device effective to maintain slippage across the torque converter substantially at a predetermined slippage level when the transmission input speed is greater than the threshold.
摘要:
An automatic transmission control system for controlling gear shifting in an automatic transmission in a motor vehicle having an automatic transmission in a motor vehicle in operative communication with a transmission control unit, the transmission control unit has adaptive gearshift logic that operates to compensate for variations in vehicle conditions and road conditions, wherein the transmission control unit outputs at least one gearshift command to the transmission to control shifting of gears in accordance with the adaptive gearshift logic. A control method uses the adaptive gearshift logic to control gear shifting within the transmission in accordance with adaptive gearshift points that compensate for variations in vehicle conditions and road conditions.
摘要:
A method for controlling torque transmitted between an internal combustion engine and a torque transmission device includes controlling actuation of a torque converter clutch device effective to maintain an engine output within a predetermined range when an input to the transmission is less than a threshold, and controlling actuation of the torque converter clutch device effective to maintain a relative speed across the torque converter substantially at a predetermined magnitude when the input to the transmission is greater than the threshold.
摘要:
A powertrain control includes monitoring map preview information, determining a road gradient factor based upon the map preview information, and adapting a transmission shift schedule based upon the road gradient factor.
摘要:
A system and method for providing TCC control and/or transmission gear shift control by considering the rate of change of the accelerator pedal or throttle position. The method determines whether the rate of change of the throttle position exceeds a predetermined positive rate of change or a predetermined negative rate of change and, if so, releases the TCC to provide TCC control. Alternatively, or additionally, the method can provide a transmission gear down-shift or up-shift depending on which direction the throttle position is changing. Once the TCC and/or gear shift control has been initiated, the method can start a timer and then return to normal TCC and/or gear shift control after the timer has expired. The TCC and/or gear shift control can also return to normal if the rate of change of the throttle position indicates that the throttle is being returned to its previous position.
摘要:
An automatic transmission control system for controlling gear shifting in an automatic transmission in a motor vehicle having an automatic transmission in a motor vehicle in operative communication with a transmission control unit, the transmission control unit has adaptive gearshift logic that operates to compensate for variations in vehicle conditions and road conditions, wherein the transmission control unit outputs at least one gearshift command to the transmission to control shifting of gears in accordance with the adaptive gearshift logic. A control method uses the adaptive gearshift logic to control gear shifting within the transmission in accordance with adaptive gearshift points that compensate for variations in vehicle conditions and road conditions.
摘要:
A control strategy is provided for controlling engagement of a clutch during vehicle launch. A feed-back input command and a feed-forward input command are utilized and summed to determine a clutch control command. The feed back input command uses a reference slip profile having a low speed portion and a high speed portion. In the low speed portion, the slip is a function of engine speed. In the high speed portion, the slip is a function of transmission output speed or vehicle speed.
摘要:
A family of power transmissions wherein each family member includes three planetary gearsets each having three members and six selectively engageable torque-transmitting mechanisms. The planetary gearsets have members that are continuously interconnected by at least three interconnecting members. The torque-transmitting mechanisms are selectively engaged in combinations of two to establish at least seven forward speed ratios and one reverse speed ratio in the three planetary gearsets.
摘要:
A method for responding to a rapid change in engine torque includes monitoring a change in engine torque and determining a rapid change in engine torque when the change in engine torque exceeds a threshold change in engine torque. Subsequent to determining a rapid change in engine torque, an increase in the torque converter slip is provided by reducing the torque converter clutch pressure command by a selected value and thereafter the feedback control is deactivated for a predetermined duration. Subsequent to the predetermined duration, the feedback control is reactivated to decrease the torque converter slip toward a desired torque converter slip value.