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US 9,849,884 B2Granted
Hill start assist control method and system for vehicles
AssigneeHyundai Motor Company
InventorIn Su Kim
Life of this patent
Estimating the term…
Abstract
A hill start assist control (HAC) method and system for vehicles is provided to prevent malfunction and sensitive operation of an HAC function, generated due to misrecognition of a flat road as a hill when the vehicle is accelerated after braking on the flat road, caused by use of a value sensed by an acceleration sensor in determination of a hill. For this purpose, a corrected gradient, in which a tilt of the vehicle in the pitch direction is reflected in a gradient acquired from the value sensed by the acceleration sensor, is used as an actual road gradient value.
Claims20
A hill start assist control (HAC) method for vehicles, comprising:
- acquiring, by a controller, vehicle state information in real time;
- determining, by the controller, whether a driver braking input is received based on the vehicle state information, wherein the controller is configured to determine whether the driver breaking input is received from a signal of a brake pedal switch as a brake pedal signal;
- calculating, by the controller, a braking deceleration of the vehicle generated by braking force from information regarding braking from the vehicle state information, in response to determining that the driver braking input is received;
- determining, by the controller, a tilt of the vehicle in the pitch direction that corresponds to the calculated braking deceleration;
- calculating, by the controller, a gradient of a road from a longitudinal acceleration signal of the vehicle from the vehicle state information;
- correcting, by the controller, the road gradient, calculated from the longitudinal acceleration signal, using the tilt of the vehicle in the pitch direction, wherein the longitudinal acceleration signal is generated by an acceleration sensor;
- determining, by the controller, whether HAC entrance conditions are satisfied using the corrected road gradient and the vehicle state information acquired in real time;
- and
- generating, by the controller, braking force to prevent the vehicle from moving backwards on a hill, in response to determining that the HAC entrance conditions are satisfied, wherein the controller is configured to adjust pressure of the wheel cylinders for generating the braking force to reach a target value through an electronic stability control (ESC) hydraulic modulator.
6 more elements
A hill start assist control (HAC) system for vehicles, comprising:
- a memory configured to store program instructions;
- and
- a processor configured to execute the program instructions, the program instructions when executed configured to:
- acquire vehicle state information in real time;
- determine whether a driver braking input is received based on the vehicle state information, wherein the processor is configured to determine whether the driver braking input is received from a signal of a brake pedal switch as a brake pedal signal;
- calculate a braking deceleration of the vehicle generated by braking force from information regarding braking from the vehicle state information, in response to determining that the driver braking input is received;
- determine a tilt of the vehicle in the pitch direction that corresponds to the calculated braking deceleration;
- calculate a gradient of a road from a longitudinal acceleration signal of the vehicle from the vehicle state information;
- correct the road gradient, calculated from the longitudinal acceleration signal, using the tilt of the vehicle in the pitch direction, wherein the longitudinal acceleration signal is generated by an acceleration sensor;
- determine whether HAC entrance conditions are satisfied using the corrected road gradient and the vehicle state information acquired in real time;
- and
- generate braking force to prevent the vehicle from moving backwards on a hill, in response to determining that the HAC entrance conditions are satisfied, wherein the processor is configured to adjust pressure of the wheel cylinders for generating the braking force to reach a target value through an electronic stability control (ESC) hydraulic modulator.
9 more elements
Dependencies are inferred from the claim text.