HYBRID VEHICLE AND CONTROL METHOD THEREOF

摘要

A hybrid vehicle provided with an engine, a first motor generator, a planetary gear mechanism, a second motor generator, a battery, a battery state sensing unit which senses the voltage and the residual capacity of the battery, a steepness sensor which senses the uphill steepness, an accelerator pedal depression amount sensor, and a controller. The minimum rotation speed of the engine is set in accordance with the uphill steepness and the accelerator pedal depression amount, when the hybrid vehicle is travelling in reverse and the battery is charged with the voltage of the battery equal to or below a first threshold or the residual capacity of the battery equal to or below a second threshold.

主权项

1. A hybrid vehicle comprising:
an engine; a first motor generator; a motive power distribution mechanism which distributes motive power transmitted from the engine to the first motor generator and a vehicle drive shaft; a second motor generator which transmits motive power to the vehicle drive shaft; a chargeable and dischargeable battery which transmits electric power to and from the first motor generator and the second motor generator; a battery state sensing unit which senses the voltage and the residual capacity of the battery; a steepness sensor which senses an uphill steepness in the travel direction; an accelerator pedal depression amount sensing unit which senses the accelerator pedal depression amount; and a controller which controls the rotation speed of the engine, wherein the controller comprises a first engine rotation speed setting unit which sets a minimum rotation speed of the engine in accordance with
the uphill steepness in the travel direction sensed by the steepness sensor; andthe accelerator pedal depression amount sensed by the accelerator pedal depression amount sensing unit, when the hybrid vehicle is travelling in reverse as a result of driving the vehicle drive shaft using the second motor generator; and the battery is charged by driving the first motor generator using the engine with the voltage of the battery equal to or below a first threshold or the residual capacity of the battery equal to or below a second threshold.