Vehicle and control method for vehicle

摘要

In a vehicle that includes an engine, a motor, a generator, a battery electrically connected to the motor and the generator, and a transmission provided between the motor and an output shaft coupled to a drive wheel, an ECU executes “battery-less travel control” in which, at the time of a failure of the battery, the battery is isolated from the motor and the generator, the generator is caused to generate electric power by generating a torque, corresponding to an accelerator pedal operation amount, from the generator, and the vehicle is caused to travel by driving the motor using the electric power generated by the generator. The ECU suppresses losing a balance of input and output electric powers between the generator and the motor by filtering the accelerator pedal operation amount when a vehicle speed exceeds a limit vehicle speed during the battery-less travel control.

主权项

1. A vehicle that travels by rotating an output shaft coupled to a drive wheel using power of at least one of an engine and a motor, comprising:
a generator that generates electric power using power of the engine; a battery that is configured to be connectable to the motor and the generator; and a controller that is programmed to:
drive the motor in a pulse width modulation control when a vehicle speed is lower than a threshold,drive the motor in rectangular control, which has an improved output but poor controllability as compared with the pulse width modulation, when the vehicle speed exceeds the threshold,determine an abnormality of the battery,execute, if the battery is determined to be abnormal, a battery-less travel control in which the battery is isolated from the motor and the generator, the generator is caused to generate electric power by generating a torque, corresponding to at least any one of an accelerator operation amount and a vehicle required torque, from the generator, and the motor is driven by using the electric power generated by the generator,determine, if the battery-less travel control is executed, if the vehicle speed exceeds the threshold, andexecute, if the vehicle speed is determined to exceed the threshold, at least one of a first process, a second process, and a third process to thereby suppress losing a balance of input and output electric powers between the generator and the motor, wherein the controller is further programmed to:
in the first process, limit a rate of variation in the accelerator operation amount,in the second process, limit rate of variation in the vehicle required torque, andin the third process, control the torque of the generator to not decrease below a predetermined lower limit.