Control system for electric vehicles

Abstract

The present invention is provided with: a motor that drives wheels of an electric vehicle; an engine that has a catalyst for purifying exhaust gas; a drive battery that supplies power to a first rotary electric machine; and a control device that controls the electric vehicle, wherein the control device executes engine output restriction control for executing temperature increase of the catalyst while restricting the engine to a predetermined output when the temperature increase of the catalyst is required, and motor output restriction control for controlling the motor while restricting the output of the motor.

Claims

1. The motor that drives the wheels of the electric vehicle, An engine having a catalyst to purify exhaust gases, A drive battery that supplies power to the motor, A control device for controlling the electric vehicle, Equipped with, The control device calculates the required output, which is the output required by the electric vehicle, and determines the motor required output and engine required output in order to achieve the required output. The control device, when it is necessary to raise the temperature of the catalyst, Engine output limiting control that performs temperature rise of the catalyst while limiting the engine to a predetermined output, Motor output limit control that limits the motor output to the predetermined output limit if the motor request output exceeds the predetermined output limit, and controls the motor output to the motor request output if the motor request output does not exceed the predetermined output limit; Execute, The control device is The charge level of the aforementioned drive battery is obtained, If the charge level is less than a predetermined charge level, a first motor output limit control is performed to limit the motor output to a first output limit value; if the charge level is equal to or greater than the predetermined charge level, a second motor output limit control is performed to limit the motor output to a second output limit value higher than the first output limit value. Control system for electric vehicles.

2. The electric vehicle has a generator, The engine drives the generator, and the generated electricity can be stored in the drive battery. In the first motor output limiting control, the motor is controlled such that the charge level of the drive battery remains constant by determining the first output limiting value according to the amount of power generated when the engine is limited to a predetermined output to drive the generator. The control system for an electric vehicle according to claim 1.

3. The control device is The temperature of the catalyst is obtained, If the temperature is higher than a predetermined temperature, a third motor output limit control is performed to limit the motor output to a third output limit value that is higher than the first output limit value. The control system for an electric vehicle according to claim 1.

4. The motor output limit value in the motor output limit control is changed according to the charge state of the drive battery. A control system for an electric vehicle according to any one of claims 1 to 3.

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