Inverter circuit, inverter control device, and vehicle drive device

Abstract

The invention provides an inverter circuit, an inverter control device, and a vehicle drive device. An inverter circuit for driving an electric motor, which is a drive source of a vehicle, is provided with: a parking lock instruction detection unit for detecting a parking lock instruction for suppressing rotation of drive wheels of the vehicle; and an energization stopping unit that stops the drive current to the electric motor when the parking lock instruction is detected. Alternatively, the inverter circuit that drives an electric motor, which is a drive source of a vehicle, is provided with: a parking lock instruction detection unit that detects a parking lock instruction that suppresses rotation of drive wheels of the vehicle; a rotation angle detection unit that detects a rotor rotation angle of the electric motor; and a control unit that, when the parking lock instruction is detected, controls the electric motor such that the rotor rotation angle becomes a constant value or less.

Description

technical field [0001] The present disclosure relates to an inverter circuit, an inverter control device, and a vehicle drive device that supply driving power to a motor mounted on a vehicle or the like. Background technique [0002] As vehicles such as electric vehicles and hybrid vehicles using motors as the drive source become more sophisticated, the inverters that supply electric power to the motors and their control circuits are required to be highly functional. In these vehicles, an electronic control unit (ECU: Electronic Control Unit) determines the running state of the vehicle, the driving operation state of the driver, and the like based on detection signals from various sensors and signals from an on-vehicle device. [0003] Generally, a vehicle is provided with a parking lock mechanism that prevents rotation of an axle when the vehicle is parked. Also in an electric vehicle or the like, the tire is mechanically fixed by engaging a lock pin with a gear or the lik...

AI Technical Summary

Problems solved by technology

As a result, during the parking lock process, a large current flows through the motor, causing problems such as temperature rise of the motor, temperature rise of the inverter circuit, and power consumption.

[0008] In addition, in an electric vehicle equipped with a parking lock control device described in Japanese Laid-Open Publication No. 2018-176832, etc., for example, when the parking lock mechanism does not operate due to a failure or the like, and the drive cannot be driven When the wheels are mechanically fixed, there is a problem that the vehicle cannot be stopped

[0009] In such a case, there is also a problem that, in order to maintain the stopped state of the vehicle, even if the vehicle is shifted to the parking lock, the driver needs to respond by operating the brake pedal, etc., and the burden on the driver becomes large.

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