Hybrid vehicle control system
AssigneeMazda Motor Corporation
InventorsTadashi Saito, Yutaro Fukuda
Life of this patent
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Abstract
In a hybrid vehicle control system, when a first traveling mode using torque of an electric motor is switched to a second traveling mode using torque of an engine, a controller performs an engine start control by applying an engagement pressure to a first clutch and by cranking the engine by the electric motor, so as to start the engine. Specifically, the controller obtains a predicted start time and an actual start time by the engine start control, and corrects the engagement pressure so as to decrease the engagement pressure applied to the first clutch at a subsequent time of starting the engine, when the actual start time is shorter than the predicted start time.
Claims8
A hybrid vehicle control system, comprising:
- an engine;
- an electric motor;
- a clutch configured to switch between a transmission of torque between the engine and the electric motor, and a non-transmission of the torque;
- and
- a controller configured to control the engine, the electric motor, and the clutch,
- wherein the controller is configured to:
- determine whether or not to switch a traveling mode of a hybrid vehicle from a first traveling mode in which the clutch is set to a disengaged state and the hybrid vehicle travels by using the torque of the electric motor without using the torque of the engine, to a second traveling mode in which the clutch is set to an engaged state and the hybrid vehicle travels by using at least the torque of the engine;
- perform a control for an engine start by applying an engagement pressure to the clutch so as to change the clutch from the disengaged state to the engaged state, and by cranking the engine by the electric motor, when the traveling mode of the hybrid vehicle is determined to be switched from the first traveling mode to the second traveling mode;
- calculate a predicted start time from a start of the control for the engine start to an end of the engine start;
- obtain an actual start time from the start of the control for the engine start to an actual end of the engine start;
- correct the engagement pressure so as to decrease the engagement pressure which is applied to the clutch at the time of performing the control for a subsequent engine start, when the actual start time is shorter than the predicted start time;
- and
- make the engagement pressure applied to the clutch larger than when a request for accelerating the hybrid vehicle is not issued by a driver, in order to shorten a start time of the engine, under a condition that the traveling mode of the hybrid vehicle is determined to be switched from the first traveling mode to the second traveling mode, when the request for accelerating the hybrid vehicle is issued by the driver.
Dependencies are inferred from the claim text.