Electromotive drive device used in engine-driven vehicle

摘要

An electromotive drive device including a small motor and a small-capacity battery more effectively improves the fuel economy of an engine-driven vehicle. An electromotive drive device includes: a motor for driving a vehicle; a battery storing electrical energy to rotate the motor; an inverter; a converting mechanism transmitting rotation of the motor to a drive shaft at a predetermined conversion ratio independently of a conversion ratio at which an engine is driven; and a control unit controlling an operation of the inverter. The control unit is configured so that upper vehicle speed limits, to which the motor is allowed to operate, can be set separately during powering and during regeneration, respectively.

主权项

1. An electromotive drive system for use in an engine-driven vehicle, the device comprising:
a motor for driving the vehicle and regenerating electric power; a battery for storing electrical energy to rotate the motor; an inverter for transforming electrical energy output from the battery into alternating current to supply the alternating current to the motor, and transforming electric power regenerated by the motor into direct current to supply the direct current back to the battery; an electronic control unit configured to control an operation of the inverter; and a converting mechanism for transmitting rotation of the motor to a drive shaft of the vehicle at a predetermined conversion ratio independently of a conversion ratio at which an engine is driven, wherein the electronic control unit is configured to set an upper vehicle speed limit, to which the motor is allowed to regenerate the electric power, to be higher than a second upper vehicle speed limit, to which the motor is allowed to drive the vehicle and to set a first maximum driving force of the motor in an absolute value during the motor driving the vehicle to be smaller than a second maximum driving force of the motor in an absolute value during the motor regenerating the electric power.