Hybrid vehicle drive control system
First Claim
1. A hybrid vehicle drive control system comprising:
- an engine;
a motor/generator;
a first clutch configured and arranged to change a first torque transfer capacity between the engine and the motor/generator;
a second clutch configured and arranged to change a second torque transfer capacity between the motor/generator and at least one drive wheel; and
a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged,the controller being further configured to set the second torque transfer capacity to a value that is more than zero and less than a target motor/generator torque of the motor/generator when starting the engine during a drive mode change from the electric drive mode to the hybrid drive mode,the controller being further configured to generate slippage in the second clutch by setting the second torque transfer capacity of the second clutch to the value that is less than the target motor/generator torque for engine startup, and to engage the first clutch regardless of a rotational state of the motor/generator.
1 Assignment
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Accused Products
Abstract
A hybrid vehicle drive control system is configured to perform engine startup when switching from an electric drive mode to a hybrid drive mode, without creating a sense of output torque loss. In particular, a controller selectively controls a first clutch disposed between the engine and the motor/generator and a second clutch disposed between the motor/generator and a drive wheel to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged. The controller sets the second torque transfer capacity to a value that is more than zero and less than the target motor/generator torque of the motor/generator when switching from the electric drive mode to the hybrid drive mode and when starting the engine.
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Citations
21 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 configured and arranged to change a first torque transfer capacity between the engine and the motor/generator; a second clutch configured and arranged to change a second torque transfer capacity between the motor/generator and at least one drive wheel; and a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged, the controller being further configured to set the second torque transfer capacity to a value that is more than zero and less than a target motor/generator torque of the motor/generator when starting the engine during a drive mode change from the electric drive mode to the hybrid drive mode, the controller being further configured to generate slippage in the second clutch by setting the second torque transfer capacity of the second clutch to the value that is less than the target motor/generator torque for engine startup, and to engage the first clutch regardless of a rotational state of the motor/generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A hybrid vehicle drive control system comprising:
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an engine; a motor/generator; a first clutch configured and arranged to change a first torque transfer capacity between the engine and the motor/generator; a second clutch configured and arranged to change a second torque transfer capacity between the motor/generator and at least one drive wheel; and a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged, the controller being further configured to set the second torque transfer capacity to a value that is more than zero and less than a target motor/generator torque of the motor/generator when starting the engine during a drive mode change from the electric drive mode to the hybrid drive mode, the controller being further configured to set the second torque transfer capacity of the second clutch by controlling the second torque transfer capacity of the second clutch when starting the engine, the controller being further configured to set the second torque transfer capacity of the second clutch when starting the engine to a smaller value of a maximum drive force that can be generated by the motor/generator and a target vehicle drive force, the controller being further configured to reduced the second torque transfer capacity of the second clutch when starting the engine to generate a prescribed slippage in the second clutch, the controller being further configured to control the prescribed slippage in the second clutch by performing feedback control of the second torque transfer capacity of the second clutch when the second clutch is determined to be operating in a coefficient of friction stable region in which the slippage of the second clutch is greater than or equal to a predetermined slippage value, the controller being further configured to control the prescribed slippage in the second clutch by performing feedforward control of the second torque transfer capacity of the second clutch when the second clutch is determined to be operating in a coefficient of friction unstable region in which the slippage of the second clutch is less than the predetermined slippage value, the controller being further configured to set the second torque transfer capacity of the second clutch to a sum of a target drive force equivalent component, the first torque transfer capacity of the first clutch, and a second clutch slip control component of the torque, when in the coefficient of friction stable region, and the controller being further configured to set the second torque transfer capacity of the second clutch to a sum of the target drive force equivalent component and the first torque transfer capacity of the first clutch when in the coefficient of friction unstable region.
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13. A hybrid vehicle drive control system comprising:
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an engine; a motor/generator; a first clutch configured and arranged to change a first torque transfer capacity between the engine and the motor/generator; a second clutch configured and arranged to change a second torque transfer capacity between the motor/generator and at least one drive wheel; and a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged, the controller being further configured to set the second torque transfer capacity to a value that is more than zero and less than a target motor/generator torque of the motor/generator when starting the engine during a drive mode change from the electric drive mode to the hybrid drive mode, the controller being further configured to set at least one of the second torque transfer capacity of the second clutch and the target motor/generator torque of the motor/generator, which are used in setting the second torque transfer capacity of the second clutch when starting the engine, to a sum of a target drive force equivalent component and a first torque transfer capacity of the first clutch when the second clutch is determined to be operating in a coefficient of friction unstable region in which the slippage of the second clutch is less than a predetermined slippage value, and the controller being further configured to set at least one of the second torque transfer capacity of the second clutch and the target motor/generator torque of the motor/generator, which are used in setting the second torque transfer capacity of the second clutch when starting the engine, to a sum of the target equivalent component, the first torque transfer capacity of the first clutch, and a second clutch slip control component of the torque when the second clutch is determined to be operating in a coefficient of friction stable region in which the slippage of the second clutch is greater than or equal to the predetermined slippage value. - View Dependent Claims (14, 15)
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16. A hybrid vehicle drive control system comprising:
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an engine; a motor/generator; a first clutch configured and arranged to change a first torque transfer capacity between the engine and the motor/generator; a second clutch configured and arranged to change a second torque transfer capacity between the motor/generator and at least one drive wheel; and a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged, the controller being further configured to set the second torque transfer capacity to a value that is more than zero and less than a target motor/generator torque of the motor/generator when starting the engine during a drive mode change from the electric drive mode to the hybrid drive mode, the controller being further configured to set the second torque transfer capacity of the second clutch by controlling the target motor/generator torque of the motor/generator when starting the engine, and the controller being further configured to set the target motor/generator torque of the motor/generator to a sum of the target drive force, the first clutch transfer torque component, and the second clutch slip control component of the torque, minus an engine torque estimated value after starting the engine.
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17. A hybrid vehicle drive control system comprising:
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an engine; a motor/generator; a first clutch configured and arranged to change a first torque transfer capacity between the engine and the motor/generator; a second clutch configured and arranged to change a second torque transfer capacity between the motor/generator and at least one drive wheel; and a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged, the controller being further configured to set the second torque transfer capacity to a value that is more than zero and less than a target motor/generator torque of the motor/generator when starting the engine during a drive mode change from the electric drive mode to the hybrid drive mode, the controller being further configured to selectively perform one of first starting engagement of the first clutch and then starting the engine, first starting the engine and then starting the engagement of the first clutch, and simultaneously starting the engagement of the first clutch and starting the engine, depending on at least one of a slipping state of the second clutch and a requested engine response when starting the engine. - View Dependent Claims (18)
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19. A hybrid vehicle drive control system comprising:
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an engine; a motor/generator; a first clutch configured and arranged to change a first torque transfer capacity between the engine and the motor/generator; a second clutch configured and arranged to change a second torque transfer capacity between the motor/generator and at least one drive wheel; and a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged, the controller being further configured to set the second torque transfer capacity to a value that is more than zero and less than a target motor/generator torque of the motor/generator when starting the engine during a drive mode change from the electric drive mode to the hybrid drive mode; the controller being further configured to set the second torque transfer capacity of the second clutch to a sum of a target drive force equivalent component, the first torque transfer capacity of the first clutch, and a second clutch slip control component of the torque when in a coefficient of friction stable region in which slippage of the second clutch is greater than or equal to a predetermined slippage value, and the controller being further configured to set the second torque transfer capacity of the second clutch to a sum of the target drive force equivalent component and the first torque transfer capacity of the first clutch when in a coefficient of friction unstable region in which the slippage of the second clutch is less than the predetermined slippage value.
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20. A hybrid vehicle drive control system comprising:
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an engine; a motor/generator; a first clutch configured and arranged to change a first torque transfer capacity between the engine and the motor/generator; a second clutch configured and arranged to change a second torque transfer capacity between the motor/generator and at least one drive wheel; and a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged, the controller being further configured to set the second torque transfer capacity to a value that is more than zero and less than a target motor/generator torque of the motor/generator when starting the engine during a drive mode change from the electric drive mode to the hybrid drive mode, and the controller being further configured to switch from a second clutch torque transfer capacity control to a hybrid drive mode control when the second clutch is determined to be operating in a coefficient of friction unstable region in which the slippage of the second clutch is less than a predetermined slippage value.
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21. 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 first torque transfer capacity between the first and second power supply means; second power transfer means for selectively changing a second 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 for setting the second torque transfer capacity to a value that is more than zero and less than a target torque of the second power supply means when starting the first power supply means during a drive mode change from the electric drive mode to the hybrid drive mode, and the controller means further including a function for generating slippage in the second power transfer means by setting the second torque transfer capacity of the second power transfer means to the value that is less than the target torque for engine startup, and a function for engaging the first power transfer means regardless of a rotational state of the second power supply means.
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Specification