VEHICLE CONTROL APPARATUS AND VEHICLE CONTROL METHOD
First Claim
1. A vehicle control apparatus comprising:
- an electric motor configured to output a torque for driving a vehicle;
a clutch including an electric motor side element and a driving wheel side element, wherein the electric motor side element is connected to the electric motor and the driving wheel side element is connected to a driving wheel of the vehicle, wherein the clutch is configured to set according to hydraulic pressure a transmitted torque capacity for torque transmission between the electric motor side element and the driving wheel side element, and wherein the hydraulic pressure is regulated to a control setpoint; and
a controller configured to set the control setpoint, wherein the controller is further configured to;
implement a drive mode by allowing slippage between the electric motor side element and the driving wheel side element of the clutch and controlling rotational speed of the electric motor in a manner that the electric motor side element of the clutch rotates faster by a controlled difference than the driving wheel side element of the clutch;
determine whether the vehicle is stationary;
obtain an actual value of the output torque of the electric motor; and
perform a procedure in response to determination that the vehicle is stationary when in the drive mode, wherein the procedure includes;
a first operation of reducing the control setpoint from an initial point;
a second operation of calculating a corrected point of the control setpoint based on a change of the actual value of the output torque of the electric motor with respect to the reduction of the control setpoint by the first operation;
a third operation of setting the control setpoint to a precharge point after the first operation, wherein the precharge point is higher than the corrected point; and
a fourth operation of setting the control setpoint to the corrected point after the third operation.
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Accused Products
Abstract
A hybrid electric vehicle has a first mode in which slippage of a clutch between an electric motor and a driving wheel is allowed and controlled by rotational speed control of the electric motor and a second mode in which the slippage of the clutch is allowed and controlled by rotational speed control of an engine. When the vehicle is stationary in the first mode, a controller reduces a control setpoint of hydraulic pressure of the clutch from an initial point. The controller identifies a reference point of the control setpoint with which actual output torque of the electric motor is substantially constant with respect to the reduction of the control setpoint. Then, the controller increases the control setpoint to a precharge point, and reduces the control setpoint to a corrected point that is lower than or substantially equal to the initial point and higher than the reference point.
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Citations
9 Claims
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1. A vehicle control apparatus comprising:
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an electric motor configured to output a torque for driving a vehicle; a clutch including an electric motor side element and a driving wheel side element, wherein the electric motor side element is connected to the electric motor and the driving wheel side element is connected to a driving wheel of the vehicle, wherein the clutch is configured to set according to hydraulic pressure a transmitted torque capacity for torque transmission between the electric motor side element and the driving wheel side element, and wherein the hydraulic pressure is regulated to a control setpoint; and a controller configured to set the control setpoint, wherein the controller is further configured to; implement a drive mode by allowing slippage between the electric motor side element and the driving wheel side element of the clutch and controlling rotational speed of the electric motor in a manner that the electric motor side element of the clutch rotates faster by a controlled difference than the driving wheel side element of the clutch; determine whether the vehicle is stationary; obtain an actual value of the output torque of the electric motor; and perform a procedure in response to determination that the vehicle is stationary when in the drive mode, wherein the procedure includes; a first operation of reducing the control setpoint from an initial point; a second operation of calculating a corrected point of the control setpoint based on a change of the actual value of the output torque of the electric motor with respect to the reduction of the control setpoint by the first operation; a third operation of setting the control setpoint to a precharge point after the first operation, wherein the precharge point is higher than the corrected point; and a fourth operation of setting the control setpoint to the corrected point after the third operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vehicle control method of controlling an object with a controller, wherein the object includes:
- an electric motor configured to output a torque for driving a vehicle;
a clutch including an electric motor side element and a driving wheel side element, wherein the electric motor side element is connected to the electric motor and the driving wheel side element is connected to a driving wheel of the vehicle, wherein the clutch is configured to set according to hydraulic pressure a transmitted torque capacity for torque transmission between the electric motor side element and the driving wheel side element, and wherein the hydraulic pressure is regulated to a control setpoint, the vehicle control method comprising;implementing a drive mode by allowing slippage between the electric motor side element and the driving wheel side element of the clutch and controlling rotational speed of the electric motor in a manner that the electric motor side element of the clutch rotates faster by a controlled difference than the driving wheel side element of the clutch; determining whether the vehicle is stationary; obtaining an actual value of the output torque of the electric motor; and performing a procedure in response to determination that the vehicle is stationary when in the drive mode, wherein the procedure includes; a first operation of reducing the control setpoint from an initial point; a second operation of calculating a corrected point of the control setpoint based on a change of the actual value of the output torque of the electric motor with respect to the reduction of the control setpoint by the first operation; a third operation of setting the control setpoint to a precharge point after the first operation, wherein the precharge point is higher than the corrected point; and a fourth operation of setting the control setpoint to the corrected point after the third operation.
- an electric motor configured to output a torque for driving a vehicle;
Specification