VEHICLE CONTROL APPARATUS AND VEHICLE CONTROL METHOD
First Claim
1. A vehicle control apparatus comprising:
- an engine configured to output a torque for driving a vehicle;
an electric motor configured to output a torque for driving the 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 an electric motor speed control 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;
implement an engine speed control drive mode by allowing the slippage of the clutch and controlling rotational speed of the engine 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;
perform a procedure of reducing the control setpoint in response to determination that the vehicle is stationary when the slippage of the clutch is being allowed and controlled;
permit the procedure when in the electric motor speed control drive mode; and
inhibit the procedure when in the engine speed control drive mode.
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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.
44 Citations
11 Claims
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1. A vehicle control apparatus comprising:
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an engine configured to output a torque for driving a vehicle; an electric motor configured to output a torque for driving the 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 an electric motor speed control 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; implement an engine speed control drive mode by allowing the slippage of the clutch and controlling rotational speed of the engine 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; perform a procedure of reducing the control setpoint in response to determination that the vehicle is stationary when the slippage of the clutch is being allowed and controlled; permit the procedure when in the electric motor speed control drive mode; and inhibit the procedure when in the engine speed control drive mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicle control method of controlling an object with a controller, wherein the object includes:
- an engine configured to output a torque for driving a vehicle;
an electric motor configured to output a torque for driving the vehicle; and
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 an electric motor speed control 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; implementing an engine speed control drive mode by allowing the slippage of the clutch and controlling rotational speed of the engine 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; performing a procedure of reducing the control setpoint in response to determination that the vehicle is stationary when the slippage of the clutch is being allowed and controlled; permitting the procedure when in the electric motor speed control drive mode; and inhibiting the procedure when in the engine speed control drive mode.
- an engine configured to output a torque for driving a vehicle;
Specification