Mode changeover control device for a hybrid vehicle
First Claim
1. A control device for a hybrid vehicle including an engine, a motor/generator, and at least one driving wheel, the hybrid vehicle operable in an electric drive mode in which the vehicle is powered only by the motor/generator and a hybrid drive mode in which the vehicle is powered by both the engine and the motor/generator, the control device comprising:
- a controller configured to;
set a first threshold level of an accelerator opening;
set a second threshold level of the accelerator opening, wherein a hysteresis value is defined between the first threshold level and the second threshold level;
change the hysteresis value based on at least one of a vehicle operating state and a driving environment, wherein the at least one of the vehicle operating state and the driving environment includes a temperature of an electric drive control system including the motor/generator, and the controller is configured to change the hysteresis value by increasing the hysteresis value as the temperature of the electric drive control system including the motor/generator increases;
receive a signal corresponding to the accelerator opening;
initiate a changeover from the hybrid drive mode to the electric drive mode if the accelerator opening is less than the first threshold level; and
initiate a changeover from the electric drive mode to the hybrid drive mode if the accelerator opening is greater than the second threshold value.
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Accused Products
Abstract
A mode changeover control device for a hybrid vehicle includes an engine, a motor/generator and at least one driving wheel. A changeover between an electric drive mode using only the electric motor to power the at least one driving wheel and a hybrid drive mode using both the engine and the electric motor to power the at least one driving wheel is controlled. The drive mode is changed from the hybrid drive mode to the electric drive mode if the accelerator opening is less than a first threshold level, and the drive mode is changed from the electric drive mode to the hybrid drive mode if the accelerator opening is greater than a second threshold level. A hysteresis value is defined between the first threshold level and the second threshold level, and the hysteresis value is changed based on a vehicle operating state.
24 Citations
20 Claims
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1. A control device for a hybrid vehicle including an engine, a motor/generator, and at least one driving wheel, the hybrid vehicle operable in an electric drive mode in which the vehicle is powered only by the motor/generator and a hybrid drive mode in which the vehicle is powered by both the engine and the motor/generator, the control device comprising:
a controller configured to; set a first threshold level of an accelerator opening; set a second threshold level of the accelerator opening, wherein a hysteresis value is defined between the first threshold level and the second threshold level; change the hysteresis value based on at least one of a vehicle operating state and a driving environment, wherein the at least one of the vehicle operating state and the driving environment includes a temperature of an electric drive control system including the motor/generator, and the controller is configured to change the hysteresis value by increasing the hysteresis value as the temperature of the electric drive control system including the motor/generator increases; receive a signal corresponding to the accelerator opening; initiate a changeover from the hybrid drive mode to the electric drive mode if the accelerator opening is less than the first threshold level; and initiate a changeover from the electric drive mode to the hybrid drive mode if the accelerator opening is greater than the second threshold value. - View Dependent Claims (2, 3, 4)
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5. A control device for a hybrid vehicle including an engine, a motor/generator, and at least one driving wheel, the hybrid vehicle operable in an electric drive mode in which the vehicle is powered only by the motor/generator and a hybrid drive mode in which the vehicle is powered by both the engine and the motor/generator, the control device comprising:
a controller configured to; set a first threshold level of an accelerator opening; set a second threshold level of the accelerator opening, wherein a hysteresis value is defined between the first threshold level and the second threshold level; change the hysteresis value based on at least one of a vehicle operating state and a driving environment; receive a signal corresponding to the accelerator opening; initiate a changeover from the hybrid drive mode to the electric drive mode if the accelerator opening is less than the first threshold level; and initiate a changeover from the electric drive mode to the hybrid drive mode if the accelerator opening is greater than the second threshold value, wherein the at least one of the vehicle operating state and the driving environment includes a vehicle speed and the hysteresis value is changed by increasing the hysteresis value as the vehicle speed decreases. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A control device of a hybrid vehicle including an engine, a motor/generator, and at least one driving wheel, the hybrid vehicle operable in an electric drive mode in which the vehicle is powered only by the motor/generator and a hybrid drive mode in which the vehicle is powered by both the engine and the motor/generator, the control system comprising:
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means for setting a first threshold level of an accelerator opening; means for setting a second threshold level of the accelerator opening, wherein a hysteresis value is defined between the first threshold level and the second threshold level; means for changing the hysteresis value based on the temperature of an electric drive control system including the motor/generator; means for receiving a signal corresponding to the accelerator opening; means for initiating a changeover from the hybrid drive mode to the electric drive mode if the accelerator opening is less than the first threshold level; and means for initiating a changeover from the electric drive mode to the hybrid drive mode if the accelerator opening is greater than the second threshold value.
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12. A method for controlling a hybrid vehicle including an engine, a motor/generator, and at least one driving wheel, the hybrid vehicle operable in an electric drive mode in which the vehicle is powered only by the motor/generator and a hybrid drive mode in which the vehicle is powered by both the engine and the motor/generator, the method comprising:
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setting a first threshold level of an accelerator opening; setting a second threshold level of the accelerator opening, wherein a hysteresis value is defined between the first threshold level and the second threshold level; changing the hysteresis value based on at least one of a vehicle operating state and a driving environment by decreasing the first threshold level with vehicle speed based on a total amount of a change to the hysteresis value and maintaining the second threshold level unchanged in response to the change to the hysteresis value; receiving a signal corresponding to the accelerator opening; initiating a changeover from the hybrid drive mode to the electric drive mode if the accelerator opening is less than the first threshold level; and initiating a changeover from the electric drive mode to the hybrid drive mode if the accelerator opening is greater than the second threshold value. - View Dependent Claims (13, 14, 15)
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16. A method for controlling a hybrid vehicle including an engine, a motor/generator, and at least one driving wheel, the hybrid vehicle operable in an electric drive mode in which the vehicle is powered only by the motor/generator and a hybrid drive mode in which the vehicle is powered by both the engine and the motor/generator, the method comprising:
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setting a first threshold level of an accelerator opening; setting a second threshold level of the accelerator opening, wherein a hysteresis value is defined between the first threshold level and the second threshold level; changing the hysteresis value based on at least one of a vehicle operating state and a driving environment; receiving a signal corresponding to the accelerator opening; initiating a changeover from the hybrid drive mode to the electric drive mode if the accelerator opening is less than the first threshold level; and initiating a changeover from the electric drive mode to the hybrid drive mode if the accelerator opening is greater than the second threshold value, wherein the at least one of the vehicle operating state and the driving environment includes a vehicle speed and the hysteresis value is changed by increasing the hysteresis value as the vehicle speed decreases. - View Dependent Claims (17, 18, 19, 20)
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Specification