Vehicle and vehicle control method
AssigneesToyota Jidosha Kabushiki Kaisha, Aisin Aw Co., Ltd.
InventorsNobuyuki Tanaka, Shoji Nagata
Life of this patent
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Abstract
In a hybrid vehicle including an engine, a motor, a generator, and a battery that is electrically connected to the motor and the generator, an ECU performs “battery-less travel control” enabling the vehicle to travel when a fault occurs in the battery by disconnecting the battery from an electrical system including the motor and the generator and driving the motor using power that is generated by the generator using the power of the engine. When the battery-less travel control is underway and a vehicle speed V exceeds a vehicle speed limit Vsh, the ECU implements a vehicle speed limitation. As a result, a control mode of the motor is less likely to shift to a rectangular control mode during the battery-less travel control.
Claims7
A vehicle that is caused to travel by rotating an output shaft coupled to a drive wheel using drive power generated by at least one of an engine and a motor, comprising:
- a generator that generates electric power using the power of the engine;
- a battery configured to be connectable to the motor and the generator;
- and
- a control apparatus programmed to:
- control the motor and the generator,
- determine if a vehicle speed is lower than a threshold,
- if the vehicle speed is lower than the threshold, drive the motor through a pulse width modulation control of an inverter connected to the motor,
- if the vehicle speed is not lower than the threshold, drive the motor through a rectangular control of the inverter, and the motor can provide a larger torque but poor controllability in comparison with the pulse width modulation control,
- determine an abnormality in the battery,
- if the abnormality in the battery is determined, perform a battery-less travel control in which the battery is disconnected from the motor and the generator, and the motor is driven using the electric power generated by the generator, and
- if the abnormality in the battery is determined and the battery-less travel control is performed, suppress execution of the rectangular control by implementing a vehicle speed limitation.
A control method for a vehicle that is caused to travel by rotating an output shaft coupled to a drive wheel using drive power generated by at least one of an engine and a motor, the vehicle including a generator that generates electric power using the power of the engine and a battery configured to be connectable to the motor and the generator, the control method comprising the steps of:
- determining if a vehicle speed is lower than a threshold;
- if the vehicle speed is lower than the threshold, driving the motor through a pulse width modulation control of an inverter connected to the motor;
- if the vehicle speed is not lower than the threshold, driving the motor through a rectangular control of the inverter, and the motor can output a larger torque but poor controllability in comparison with the pulse width modulation control;
- determining an abnormality in the battery;
- if the abnormality in the battery is determined, performing a battery-less travel control in which the battery is disconnected from the motor and the generator, and the motor is driven using the electric power generated by the generator;
- and
- if the abnormality in the battery is determined and the battery-less travel control is performed, suppressing execution of the rectangular control by implementing a vehicle speed limitation.
A vehicle that is caused to travel by rotating an output shaft coupled to a drive wheel using drive power generated by at least one of an engine and a motor, comprising:
- a generator that generates electric power using the power of the engine;
- a battery configured to be connectable to the motor and the generator;
- a transmission provided between the motor and the output shaft, the transmission having a gear speed that can be set to either a low speed position or a high speed position having a smaller speed ratio than the low speed position;
- and
- a control apparatus programmed to:
- control the motor and the generator,
- determine if a vehicle speed is lower than a threshold,
- if the vehicle speed is lower than the threshold, drive the motor through a pulse width modulation control of an inverter connected to the motor,
- if the vehicle speed is not lower than the threshold, drive the motor through a rectangular control of the inverter, and the motor can provide a larger torque but poor controllability in comparison with the pulse width modulation control,
- determine an abnormality in the battery,
- if the abnormality in the battery is determined, perform a battery-less travel control in which the battery is disconnected from the motor and the generator, and the motor is driven using the electric power generated by the generator,
- if the abnormality in the battery is determined and the battery-less travel control is performed, suppress execution of the rectangular control by controlling the vehicle speed to be at or below a limit value corresponding to the threshold, and
- control the threshold and the limit value to be larger when the gear speed is set at the high speed position than when the gear speed is set at the low speed position.
Dependencies are inferred from the claim text.