Hybrid vehicle drive control system
First Claim
1. A hybrid vehicle drive control system comprising:
- an engine;
a motor/generator;
a first clutch arranged to change a torque transfer capacity between the engine and the motor/generator;
a second clutch arranged to change a torque transfer capacity between the motor/generator and at least one drive wheel of a hybrid vehicle; and
a controller configured to selectively control the first and second clutches to switch between an electric drive mode by releasing the first clutch and engaging the second clutch, and a hybrid drive mode by engaging both the first and second clutches, the controller being configured to execute a slip control of the second clutch when the first clutch is being connected to start the engine during a mode change from the electric drive mode to the hybrid drive mode by controlling the torque transfer capacity of the second clutch to a target drive force required by the hybrid vehicle, and by simultaneously increasing a torque of the motor/generator by an amount corresponding to a torque required to start the engine while maintaining a slipping state of the second clutch until connection of the first clutch is completed.
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Accused Products
Abstract
A hybrid vehicle drive control system selectively switches from an electric drive (EV) mode in which a first clutch is released and a second clutch is engaged, and a hybrid drive (HEV) mode in which both clutches are engaged. A slip control of the second clutch is executed when the first clutch is being connected to start the engine during switching from EV mode to HEV mode by controlling a torque transfer capacity of the second clutch to a required drive force, and by simultaneously increasing a motor/generator torque by an amount corresponding to a torque required to start the engine while maintaining a slipping state of the second clutch until connection of the first clutch is completed. Thus, a loss of torque is not felt by the driver and the shock is small when the engine is started during switching from EV mode to HEV mode.
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Citations
16 Claims
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1. A hybrid vehicle drive control system comprising:
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an engine;
a motor/generator;
a first clutch arranged to change a torque transfer capacity between the engine and the motor/generator;
a second clutch arranged to change a torque transfer capacity between the motor/generator and at least one drive wheel of a hybrid vehicle; and
a controller configured to selectively control the first and second clutches to switch between an electric drive mode by releasing the first clutch and engaging the second clutch, and a hybrid drive mode by engaging both the first and second clutches, the controller being configured to execute a slip control of the second clutch when the first clutch is being connected to start the engine during a mode change from the electric drive mode to the hybrid drive mode by controlling the torque transfer capacity of the second clutch to a target drive force required by the hybrid vehicle, and by simultaneously increasing a torque of the motor/generator by an amount corresponding to a torque required to start the engine while maintaining a slipping state of the second clutch until connection of the first clutch is completed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A hybrid vehicle drive control system comprising:
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first power supply means for supplying a first source of power;
second power supply means for supplying a second source of power;
first power transfer means for selectively changing a torque transfer capacity between the first and second power supply means;
second power transfer means for selectively changing a torque transfer capacity between the second power supply means and at least one drive wheel of a hybrid vehicle; and
control means for selectively controlling the first and second power transfer means to switch between an electric drive mode by releasing the first power transfer means and engaging the second power transfer means, and a hybrid drive mode by engaging both the first and second power transfer means, the control means further including a function of executing a slip control of the second power transfer means when the first power transfer means is being connected to start the first power supply means during a mode change from the electric drive mode to the hybrid drive mode by controlling the torque transfer capacity of the second power transfer means to a target drive force required by the hybrid vehicle, and by simultaneously increasing a torque of the second power supply means by an amount corresponding to a torque required to start the first power supply means while maintaining a slipping state of the second power transfer means until connection of the first power transfer means is completed. - View Dependent Claims (14)
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15. A hybrid vehicle drive control method comprising:
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selectively changing a torque transfer capacity between an engine and a motor/generator using a first clutch;
selectively changing a torque transfer capacity between the motor/generator and at least one drive wheel of a hybrid vehicle;
selectively controlling the first and second clutches to switch between an electric drive mode by releasing the first clutch and engaging the second clutch, and a hybrid drive mode by engaging both the first and second clutches; and
executing a slip control of the second clutch when the first clutch is being connected to start the engine during a mode change from the electric drive mode to the hybrid drive mode by controlling the torque transfer capacity of the second clutch to a target drive force required by the hybrid vehicle, and by simultaneously increasing a torque of the motor/generator by an amount corresponding to a torque required to start the engine while maintaining a slipping state of the second clutch until connection of the first clutch is completed. - View Dependent Claims (16)
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Specification