Control system for hybrid vehicle
AssigneesToyota Jidosha Kabushiki Kaisha, DENSO TEN Limited
InventorsYukari Okamura, Yasuhiro Oshiumi, Yumeto Shiraki
Life of this patent
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Abstract
A control system for a hybrid vehicle that reduces delay in engagement of a clutch when shifting an operating mode by manipulating the clutch. A controller is configured to adjust a speed of a first motor to a first standby speed at which the speed difference in a first clutch is reduced when an operating mode will be shifted from a single-motor mode to a first mode, and adjust a speed of the first motor to a second standby speed at which a speed difference in the second clutch is reduced when the operating mode will be shifted from the single-motor mode to a second mode.
Claims10
A control system for a hybrid vehicle, comprising:
- a prime mover including an engine, a first motor, and a second motor;
- a first differential mechanism that performs a differential action among a first rotary element that is connected to the engine, a second rotary element that is connected to the first motor, and a third rotary element that transmits torque to a pair of drive wheels;
- a second differential mechanism that performs a differential action among a fourth rotary element that is connected to the second motor, a fifth rotary element that is connected to the third rotary element, and a sixth rotary element;
- a first engagement device that selectively connects the first rotary element to the sixth rotary element;
- and
- a second engagement device that selectively connects any of the fourth rotary element, the fifth rotary element, and the sixth rotary element,
- wherein a speed of the first engagement device and the second engagement device are controlled respectively by the first motor when engaged, and
- an operating mode is selected from a plurality of modes including
- a first mode established by engaging the first engagement device,
- a second mode established by engaging the second engagement device, in which the torque delivered to the drive wheels is smaller compared to the first mode, and
- a single-motor mode established by disengaging both of the first engagement device and the second engagement device, in which the hybrid vehicle is propelled only by a drive torque generated by the second motor,
- each of the first engagement device and the second engagement device comprises an input element and an output element engaged to each other to transmit the torque, and
- a speed difference between the input element and the output element of each of the first engagement device and the second engagement device is controlled by the first motor,
- the control system comprising:
- a controller that controls the first motor,
- wherein the controller is configured to
- estimate an operating mode to be shifted from the single-motor mode to the first mode and the second mode,
- adjust a speed of the first motor to a first standby speed at which the speed difference between the input element and the output element of the first engagement device is reduced, when the controller estimates that the operating mode will be shifted from the single-motor mode to the first mode, and
- adjust the speed of the first motor to a second standby speed at which the speed difference between the input element and the output element of the second engagement device is reduced, when the controller estimates that the operating mode will be shifted from the single-motor mode to the second mode.
Dependencies are inferred from the claim text.