Hill start assist method and a controller for hill start assist of a vehicle
First Claim
1. A hill start assist method for a vehicle, the method comprising:
- using an acceleration sensor to sense a degree of a slope resistance when the vehicle is stationary on a slope;
detecting a hill start intention based on a change of parameters or statuses related to the vehicle occurred during starting of the vehicle on a hill, the change of parameters or statuses including detecting at least one of;
a release of a brake pedal of the vehicle;
ora drop in engine speed; and
after the hill start intention has been detected, using an electronic controller to convert a sensed slope resistance into a target torque of the engine, and controlling the engine to increase an engine torque to the target torque to counteract a momentary rearward rolling of the vehicle without further engaging a brake of the vehicle.
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Abstract
A hill start assist method for a vehicle includes a vehicle-mounted controller for sensing an intention to start on an uphill slope, and converts a sensed gradient resistance into a target torque, and enables the engine to have adequate torque reserve in advance; therefore, in the subsequent start, driving wheels can obtain sufficient driving force to ensure that the vehicle will not slide backward. Furthermore, for a manual automobile, the engine torque is boosted in an early stage during a clutch release by a driver, thus accelerating the rotation speed of the engine, and avoiding, to a certain extent, engine stalling caused by a too quick or too much clutch release, compared with the situation where the engine is completely idling.
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Citations
16 Claims
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1. A hill start assist method for a vehicle, the method comprising:
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using an acceleration sensor to sense a degree of a slope resistance when the vehicle is stationary on a slope; detecting a hill start intention based on a change of parameters or statuses related to the vehicle occurred during starting of the vehicle on a hill, the change of parameters or statuses including detecting at least one of; a release of a brake pedal of the vehicle;
ora drop in engine speed; and after the hill start intention has been detected, using an electronic controller to convert a sensed slope resistance into a target torque of the engine, and controlling the engine to increase an engine torque to the target torque to counteract a momentary rearward rolling of the vehicle without further engaging a brake of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A controller for a hill start assist of a vehicle, the controller comprising:
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a first device for sensing a degree of a slope resistance when the vehicle is stationary on a slope; a second device for detecting a hill start intention based on a change of parameters or statuses related to the vehicle occurring during starting movement of the vehicle on a hill, the change of parameters or statuses including at least one of; a release of a brake pedal of the vehicle;
ora drop in engine speed of an engine of the vehicle; and a third device for converting a sensed slope resistance into a target torque for the engine after the hill start intention has been detected, and controlling the engine to increase an engine torque to the target torque to counteract a momentary rearward rolling of the vehicle without further engaging a brake of the vehicle. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification