HYBRID VEHICLE DRIVE CONTROL SYSTEM
First Claim
1. A hybrid vehicle drive control system for a hybrid vehicle which comprises a drive system including an engine, a motor, a first clutch disposed between the engine and the motor, a second clutch disposed between the engine and a drive wheel, and operative, upon receipt of an engine start request, to engage the first clutch to thereby start the engine using a torque of the motor, the control hybrid vehicle drive system comprising:
- a second clutch control unit programmed to conduct a second clutch control of the second clutch to disconnect a torque transmission path between the motor and the drive wheel upon the engine start request;
a motor rotational speed control unit programmed to reduce a motor rotational speed through a motor rotational speed reduction control of the motor while the torque transmission path between the motor and the drive wheel is disconnected;
an engine start control unit programmed to engage the first clutch to start the engine using the torque of the motor while the motor rotational speed is reduced, and to fully engage the second clutch after complete combustion of the engine; and
a shift control unit programmed to conclude a downshift of a transmission, during a time from starting the engine to a time of full engagement of the second clutch in the torque transmission path between the motor and the drive wheel being disconnected.
1 Assignment
0 Petitions
Accused Products
Abstract
A hybrid vehicle drive control system is configured to start an engine irrespective of a motor rotational speed or a driving scene. In the hybrid vehicle drive control system, upon receiving an engine startup request, the engine is started by engaging a first clutch provided between the engine and a motor using the torque of the motor. A second clutch is provided between the motor and the drive wheel. The second clutch is disengaged by a second clutch control operation to reduce the motor rotation speed as a result of the motor rotational speed control by a motor rotation speed-controlling operation. The control system may thus increase the maximum motor output enable torque to ensure the start of the engine by the surplus torque irrespective of a motor rotational speed or driving scene.
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Citations
10 Claims
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1. A hybrid vehicle drive control system for a hybrid vehicle which comprises a drive system including an engine, a motor, a first clutch disposed between the engine and the motor, a second clutch disposed between the engine and a drive wheel, and operative, upon receipt of an engine start request, to engage the first clutch to thereby start the engine using a torque of the motor, the control hybrid vehicle drive system comprising:
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a second clutch control unit programmed to conduct a second clutch control of the second clutch to disconnect a torque transmission path between the motor and the drive wheel upon the engine start request; a motor rotational speed control unit programmed to reduce a motor rotational speed through a motor rotational speed reduction control of the motor while the torque transmission path between the motor and the drive wheel is disconnected; an engine start control unit programmed to engage the first clutch to start the engine using the torque of the motor while the motor rotational speed is reduced, and to fully engage the second clutch after complete combustion of the engine; and a shift control unit programmed to conclude a downshift of a transmission, during a time from starting the engine to a time of full engagement of the second clutch in the torque transmission path between the motor and the drive wheel being disconnected. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10)
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4. (canceled)
Specification