Electric vehicle drive control device and control method therefor

Abstract

An electric vehicle drive control device includes a first electric motor and a second electric motor; a differential device that includes first, second and third rotational elements, wherein the first rotational element is connected with the first electric motor, the second rotational element is connected with the second electric motor, and the third rotational elements is connected with the engine; a transmission that is connected with the second electric motor via a transmission shaft, and that shifts a speed of a rotation transferred from the transmission shaft; and a controller that: judges whether an engine start request for starting the engine is generated and whether a downshift request is generated; and starts, if the engine start request and the downshift request are generated, one of an engine start control and a downshift control when the other of the engine start control and the downshift control is executed.

Description

technical field [0001] The invention relates to an electric vehicle drive control device and a control method thereof. Background technique [0002] Conventionally, a vehicle driving device is mounted on an electric vehicle, such as a hybrid vehicle, and transmits the torque of the engine, that is, a part of the engine torque to the generator, and transmits the rest of the torque to the drive wheels. A vehicle drive device has a planetary gear assembly including a sun gear, a ring gear, and a planetary carrier. Furthermore, the above-mentioned carrier is connected to the engine, the ring gear and the electric motor are connected to the driving wheel through the transmission, the sun gear is connected to the generator, and the rotation output from the above-mentioned ring gear and the electric motor is transmitted to the driving wheel. and make it drive. [0003] However, when the electric motor is driven, and the torque of the electric motor, that is, the electric motor to...

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned conventional vehicle drive device, even if any one of the engine start control and the downshift control is performed first, the rotation speed of the generator, that is, the generator rotation speed After a sharp increase and then a sharp decrease, or a sharp decrease and then a sharp increase, the rotation speed of the generator continuously fluctuates greatly

[0006] As a result, the inertial torque generated with the fluctuation of the generator rotation speed is transmitted to the driving wheels, causing a shift shock and reducing the driving feeling.

[0007] In addition, since the other control is started after the end of one control, the time until the end of the overall control is prolonged, so the response of the hybrid vehicle to the accelerator operation of the driver is slow.

As a result, a sense of discomfort is produced and the driving feeling is reduced

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