Torque control system and torque control method for hybrid vehicle

A torque control system for a hybrid vehicle, comprising:

• an engine and an electric motor serving as drive power sources of the vehicle;
• a clutch connected to an output side of said engine;
• a transmission connected to an output side of said clutch;
• engine torque control means for controlling a torque of said engine;
• shift control means for performing a gear shift operation by selectively engaging and, disengaging said clutch and selectively shifting gears of said transmission while the engine torque is being temporarily varied by said engine torque control means;
• accelerator control input detecting means for detecting a depression amount of an accelerator pedal by a driver;
• depression amount corresponding engine torque estimating means for estimating a depression amount corresponding engine torque that corresponds to the detected depression amount;
• actual engine torque estimating means for estimating an actual engine torque;
• motor torque control means for controlling torque of said motor, said motor torque control means including,
• first control means for controlling a torque of said motor based on the estimated depression amount corresponding engine torque while said clutch is in a totally disengaged state, and
• second torque control means for controlling the torque of said motor based on a difference between the estimated depression amount corresponding engine torque and the estimated actual engine torque when said clutch is in at least one of a state prior to disengagement and after engagement;
• actual motor torque detecting means for detecting an actual motor torque;
• and
• necessary motor torque detecting means for detecting a required motor torque based on the detected actual motor torque and the estimated depression amount corresponding engine torque,
• wherein said engine torque change rate changing means includes,
• first correcting means for increasing the rate of change in the engine torque when the detected actual motor torque is greater than the detected required motor torque while the engine torque is decreasing, and
• second correcting means for decreasing the rate of change in the engine torque when the detected actual motor torque is smaller than the detected required motor torque while the engine torque is decreasing.

A torque control system for a hybrid vehicle, comprising:

• an engine and an electric motor serving as drive power sources of the vehicle;
• a clutch connected to an output side of said engine;
• a transmission connected to an output side of said clutch;
• engine torque control means for controlling a torque of said engine;
• shift control means for performing a gear shift operation by selectively engaging and disengaging said clutch and selectively shifting gears of said transmission while the engine torque is being temporarily varied by said engine torque control means;
• accelerator control input detecting means for detecting a depression amount of an accelerator pedal by a driver;
• depression amount corresponding engine torque estimating means for estimating a depression amount corresponding engine torque that corresponds to the detected depression amount;
• actual engine torque estimating means for estimating an actual engine torque;
• motor torque control means for controlling torque of said motor, said motor torque control means including,
• first control means for controlling a torque of said motor based on the estimated depression amount corresponding engine torque while said clutch is in a totally disengaged state, and
• second torque control means for controlling the torque of said motor based on a difference between the estimated depression amount corresponding engine torque and the estimated actual engine torque when said clutch is in at least one of a state prior to disengagement and after engagement;
• actual motor torque detecting means for detecting an actual motor torque;
• and
• necessary motor torque detecting means for detecting a required motor torque based on the detected actual motor torque and the estimated depression amount corresponding engine torque,
• wherein said engine torque change rate changing means includes,
• first correcting means for decreasing the rate of change in the engine torque when the detected actual motor torque is larger than the detected required motor torque while the engine torque is increasing, and
• second correcting means for increasing the rate of change in the engine torque when the detected actual motor torque is smaller than the detected required motor torque while the engine torque is increasing.

A torque control method for a hybrid vehicle, comprising:

• providing an engine and an electric motor serving as drive power sources of the vehicle;
• providing a clutch connected to an output side of said engine;
• providing a transmission connected to an output side of said clutch;
• detecting a depression amount of an accelerator pedal by a driver;
• estimating a depression amount corresponding engine torque that corresponds to the detected depression amount;
• estimating an actual engine torque;
• initiating a gear shift operation by selectively engaging and disengaging said clutch and selectively shifting gears of said transmission while varying the engine torque;
• controlling a torque of said motor based on the estimated depression amount corresponding engine torque while said clutch is in a totally disengaged state;
• increasing the torque of said motor based on a difference between the estimated depression amount corresponding engine torque and the estimated actual engine torque as the estimated actual engine torque is decreased prior to disengagement of said clutch for performing the gear shift operation;
• and
• decreasing the torque of said motor based on the difference as the estimated actual engine torque is increased prior to engagement of said clutch after performing the gear shift operation.

A torque control method for a hybrid vehicle, comprising:

• providing an engine and an electric motor serving as drive power sources of the vehicle;
• providing a clutch connected to an output side of said engine;
• providing a transmission connected to an output side of said clutch;
• detecting a depression amount of an accelerator pedal by a driver;
• estimating a depression amount corresponding engine torque that corresponds to the detected depression amount;
• estimating an actual engine torque;
• initiating a gear shift operation by selectively engaging and disengaging said clutch and selectively shifting gears of said transmission while varying the engine torque;
• controlling a torque of said motor based on the estimated depression amount corresponding engine torque while said clutch is in a totally disengaged state;
• controlling the torque of said motor based on a difference between the estimated depression amount corresponding engine torque and the estimated actual engine torque when said clutch is in at least one of a state prior to disengagement and after engagement;
• detecting an actual motor torque;
• detecting a required motor torque based on the detected actual motor torque and the estimated depression amount corresponding engine torque;
• increasing a rate of change in the engine torque when the detected actual motor torque is greater than the detected required motor torque while the engine torque is decreasing;
• and
• decreasing the rate of change in the engine torque when the detected actual motor torque is smaller than the detected required motor torque while the engine torque is decreasing.

A torque control method for a hybrid vehicle, comprising:

• providing an engine and an electric motor serving as drive power sources of the vehicle;
• providing a clutch connected to an output side of said engine;
• providing a transmission connected to an output side of said clutch;
• detecting a depression amount of an accelerator pedal by a driver;
• estimating a depression amount corresponding engine torque that corresponds to the detected depression amount;
• estimating an actual engine torque;
• initiating a gear shift operation by selectively engaging and disengaging said clutch and selectively shifting gears of said transmission while varying the engine torque;
• controlling a torque of said motor based on the estimated depression amount corresponding engine torque while said clutch is in a totally disengaged state;
• and
• controlling the torque of said motor based on a difference between the estimated depression amount corresponding engine torque and the estimated actual engine torque when said clutch is in at least one of a state prior to disengagement and after engagement;
• detecting an actual motor torque;
• detecting a required motor torque based on the detected actual motor torque and the estimated depression amount corresponding engine torque;
• decreasing a rate of change in the engine torque when the detected actual motor torque is smaller than the detected required motor torque while the engine torque is increasing;
• and
• increasing the rate of change in engine torque when the detected actual motor torque is smaller than the detected required motor torque while the engine torque is increasing.