Control device for vehicle electric drive motor and vehicle with the same

Abstract

A controller for vector-controlled motor of vehicle judges whether a battery needs to be warmed up in accordance with an output of a battery temperature sensor, and when the battery needs to be warmed up, in situation (i) where the vehicle is stopped, sets a q-axis current value of the motor at zero, or when a brake is released from the situation (i), sets a q-axis current at a value corresponding to a drive torque for a vehicle creep operation, and sets a d-axis current at a value for battery warm-up. When the battery needs to be warmed up in situation (ii) where the vehicle is running, the controller sets a q-axis current at a value corresponding to a drive torque of vehicle running and sets a d-axis current at a value for the battery warm-up in relation to the q-axis current value.

Description

technical field [0001] The present invention relates to a control device for a drive motor for driving a vehicle and a vehicle (for example, an electric vehicle, a hybrid vehicle, etc.) equipped with the control device, and more particularly to motor control for controlling electric power supplied from a battery to a motor subjected to vector control device. Background technique [0002] Conventionally, a chargeable and dischargeable secondary battery (hereinafter referred to as a battery) is known as a motor power source of an electric vehicle or a hybrid vehicle using an electric motor as a driving source for vehicle running. The battery has a property that its charge-discharge characteristics decrease when the battery temperature decreases, and it is preferable to preheat the battery when the vehicle is stopped for a long time and then restarted from a cold start in winter or in cold regions where the external temperature is low. [0003] As a prior art for battery warm-...

AI Technical Summary

Problems solved by technology

[0007] However, when it is intended to apply the battery warm-up operation (cold start operation) of the above-mentioned Patent Document 1 to a vehicle whose driving source is only an electric motor, that is, a so-called electric vehicle, since the battery warm-up operation of Patent Document 1 uses the internal combustion engine The operation and the d-axis current of the driving motor are used together, so it cannot cope with

That is, when the technology of Patent Document 1 is applied to an electric vehicle, since only the d-axis current of the vector control flows during cold start (when battery warm-up is required), it can be handled when the vehicle is stopped, but in the driving mode ( In the mode in which the required drive torque to the motor is generated via the accelerator), since the q-axis current (torque component current) is generated, only the d-axis current cannot flow, which is difficult to deal with

On the other hand, in a hybrid vehicle, during battery warm-up operation, only the d-axis current flows through the driving motor (the q-axis current is zero: the driving motor does not rotate), and the vehicle is driven exclusively by the internal combustion engine. Therefore, from the viewpoint of environmental protection such as reducing exhaust emissions, the characteristics of hybrid vehicles cannot be fully utilized.

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