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US 10,518,766 B2Granted
Control system for hybrid vehicle, hybrid vehicle, and control method for hybrid vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKensei Hata, Akira Murakami, Hidekazu Nagai, Takahito Endo, Yuji Iwase
Life of this patent
Estimating the term…
Abstract
When an engine is started by causing a first motor coupled to first drive wheels to motor the engine while a hybrid vehicle is turning with the engine stopped, an electronic control unit controls output torque of a second motor, in such a direction as to curb change of a steering characteristic of the hybrid vehicle due to change of drive torque of the first drive wheels induced by motoring of the engine by the first motor.
Claims14
A control system for a hybrid vehicle, the hybrid vehicle including
- an engine and a first motor each configured to deliver drive torque to first drive wheels as one pair of front wheels and rear wheels,
- a second motor configured to deliver drive torque to second drive wheels as the other pair of the front wheels and the rear wheels, and
- a differential mechanism including
- a first rotational element configured to receive torque of the engine,
- a second rotational element configured to receive torque of the first motor, and
- a third rotational element configured to deliver torque to the first drive wheels,
- the control system comprising
- an electronic control unit configured to:
- perform motoring of the engine by the first motor;
- and
- control output torque of the second motor when motoring of the engine by the first motor is performed while the hybrid vehicle is turning with the engine stopped, in such a direction as to curb change of a steering characteristic of the hybrid vehicle due to change of drive torque of the first drive wheels induced by motoring of the engine by the first motor, wherein
- the first drive wheels are the front wheels, and the second drive wheels are the rear wheels, and
- the electronic control unit is configured to
- determine whether a drive torque sharing ratio of the front wheels is equal to or larger than a predetermined reference value;
- and
- reduce the output torque of the second motor, when the drive torque sharing ratio of the front wheels is equal to or larger than the reference value, and motoring of the engine by the first motor is performed;
- and
- the drive torque sharing ratio of the front wheels is a ratio of drive torque of the front wheels to overall drive torque of the hybrid vehicle when the hybrid vehicle turns while traveling with the output torque of the first motor and the output torque of the second motor.
15 more elements
A control system for a hybrid vehicle, the hybrid vehicle including
- an engine and a first motor each configured to deliver drive torque to first drive wheels as one pair of front wheels and rear wheels,
- a second motor configured to deliver drive torque to second drive wheels as the other pair of the front wheels and the rear wheels, and
- a differential mechanism including
- a first rotational element configured to receive torque of the engine,
- a second rotational element configured to receive torque of the first motor, and
- a third rotational element configured to deliver torque to the first drive wheels,
- the control system comprising
- an electronic control unit configured to:
- perform motoring of the engine by the first motor;
- and
- control output torque of the second motor when motoring of the engine by the first motor is performed while the hybrid vehicle is turning with the engine stopped, in such a direction as to curb change of a steering characteristic of the hybrid vehicle due to change of drive torque of the first drive wheels induced by motoring of the engine by the first motor, wherein
- the first drive wheels are the front wheels, and the second drive wheels are the rear wheels, and
- the electronic control unit is configured to:
- determine whether a drive torque sharing ratio of the front wheels is smaller than a predetermined reference value;
- and
- increase the output torque of the second motor, when the drive torque sharing ratio of the front wheels is smaller than the reference value, and motoring of the engine by the first motor is performed;
- the drive torque sharing ratio of the front wheels is a ratio of drive torque of the front wheels to overall drive torque of the hybrid vehicle when the hybrid vehicle turns while traveling with the output torque of the first motor and the output torque of the second motor.
14 more elements
A hybrid vehicle comprising:
- an engine and a first motor each configured to deliver drive torque to first drive wheels as one pair of front wheels and rear wheels;
- a second motor configured to deliver drive torque to second drive wheels as the other pair of the front wheels and the rear wheels;
- and
- a differential mechanism including
- a first rotational element configured to receive torque of the engine,
- a second rotational element configured to receive torque of the first motor, and
- a third rotational element configured to deliver torque to the first drive wheels;
- and
- an electronic control unit configured to
- perform motoring of the engine by the first motor, and
- control output torque of the second motor when motoring of the engine by the first motor is performed while the hybrid vehicle is turning with the engine stopped, in such a direction as to curb change of a steering characteristic of the hybrid vehicle due to change of drive torque of the first drive wheels induced by motoring of the engine by the first motor, wherein
- the first drive wheels are the front wheels, and the second drive wheels are the rear wheels, and
- the electronic control unit is configured to:
- determine whether a drive torque sharing ratio of the front wheels is equal to or larger than a predetermined reference value;
- and
- reduce the output torque of the second motor, when the drive torque sharing ratio of the front wheels is equal to or larger than the reference value, and motoring of the engine by the first motor is performed, and
- the drive torque sharing ratio of the front wheels is a ratio of drive torque of the front wheels to overall drive torque of the hybrid vehicle when the hybrid vehicle turns while traveling with the output torque of the first motor and the output torque of the second motor.
14 more elements
A hybrid vehicle comprising:
- an engine and a first motor each configured to deliver drive torque to first drive wheels as one pair of front wheels and rear wheels;
- a second motor configured to deliver drive torque to second drive wheels as the other pair of the front wheels and the rear wheels;
- and
- a differential mechanism including
- a first rotational element configured to receive torque of the engine,
- a second rotational element configured to receive torque of the first motor, and
- a third rotational element configured to deliver torque to the first drive wheels;
- and
- an electronic control unit configured to
- perform motoring of the engine by the first motor, and
- control output torque of the second motor when motoring of the engine by the first motor is performed while the hybrid vehicle is turning with the engine stopped, in such a direction as to curb change of a steering characteristic of the hybrid vehicle due to change of drive torque of the first drive wheels induced by motoring of the engine by the first motor, wherein
- the first drive wheels are the front wheels, and the second drive wheels are the rear wheels, and
- the electronic control unit is configured to:
- determine whether a drive torque sharing ratio of the front wheels is smaller than a predetermined reference value;
- and
- increase the output torque of the second motor, when the drive torque sharing ratio of the front wheels is smaller than the reference value, and motoring of the engine by the first motor is performed,
- the drive torque sharing ratio of the front wheels is a ratio of drive torque of the front wheels to overall drive torque of the hybrid vehicle when the hybrid vehicle turns while traveling with the output torque of the first motor and the output torque of the second motor.
14 more elements
A control method for a hybrid vehicle, the hybrid vehicle including
- an engine and a first motor configured to deliver drive torque to first drive wheels which are front wheels,
- a second motor configured to deliver drive torque to second drive wheels which are rear wheels,
- a differential mechanism including
- a first rotational element configured to receive torque of the engine,
- a second rotational element configured to receive torque of the first motor,
- a third rotational element configured to deliver torque to the first drive wheels, and
- an electronic control unit configured to perform motoring of the engine by the first motor,
- the control method comprising:
- controlling, by the electronic control unit, output torque of the second motor when motoring of the engine by the first motor is performed while the hybrid vehicle is turning with the engine stopped, in such a direction as to curb change of a steering characteristic of the hybrid vehicle due to change of drive torque of the first drive wheels induced by motoring of the engine by the first motor
- determining whether a drive torque sharing ratio of the front wheels is equal to or larger than a predetermined reference value;
- and
- reducing the output torque of the second motor, when the drive torque sharing ratio of the front wheels is equal to or larger than the reference value, and motoring of the engine by the first motor is performed,
- wherein the drive torque sharing ratio of the front wheels is a ratio of drive torque of the front wheels to overall drive torque of the hybrid vehicle when the hybrid vehicle turns while traveling with the output torque of the first motor and the output torque of the second motor.
10 more elements
A control method for a hybrid vehicle, the hybrid vehicle including
- an engine and a first motor configured to deliver drive torque to first drive wheels which are front wheels,
- a second motor configured to deliver drive torque to second drive wheels which are rear wheels,
- a differential mechanism including
- a first rotational element configured to receive torque of the engine,
- a second rotational element configured to receive torque of the first motor,
- a third rotational element configured to deliver torque to the first drive wheels, and
- an electronic control unit configured to perform motoring of the engine by the first motor,
- the control method comprising:
- controlling, by the electronic control unit, output torque of the second motor when motoring of the engine by the first motor is performed while the hybrid vehicle is turning with the engine stopped, in such a direction as to curb change of a steering characteristic of the hybrid vehicle due to change of drive torque of the first drive wheels induced by motoring of the engine by the first motor;
- determining whether a drive torque sharing ratio of the front wheels is smaller than a predetermined reference value;
- and
- increasing the output torque of the second motor, when the drive torque sharing ratio of the front wheels is smaller than the reference value, and motoring of the engine by the first motor is performed,
- wherein the drive torque sharing ratio of the front wheels is a ratio of drive torque of the front wheels to overall drive torque of the hybrid vehicle when the hybrid vehicle turns while traveling with the output torque of the first motor and the output torque of the second motor.
10 more elements
Dependencies are inferred from the claim text.