Braking system for estimating vehicle reference speed in a vehicle during a wheel slip event
AssigneeVeoneer Nissin Brake Systems Japan Co., Ltd.
InventorsShawn Wang, Huan Fu, Long Ying
Life of this patent
Estimating the term…
Abstract
A method for updating a vehicle reference speed for a vehicle is disclosed. The method includes increasing brake pressure to at least one wheel of the plurality of wheels and determining, via an electronic control unit, that a first wheel speed of the at least one wheel is less than a second wheel speed of another wheel of the plurality of wheels. The method also includes estimating the vehicle reference speed of the vehicle based upon the first wheel speed of the at least one wheel.
Claims20
A method for updating a vehicle reference speed of an all-wheel drive vehicle during acceleration, the all-wheel drive vehicle having a plurality of wheels, the method comprising:
- repeatedly increasing brake torque to at least one wheel of the plurality of wheels on at least one axle until it is determined, via an electronic control unit:
- (1) that a first wheel speed of the at least one wheel on the at least one axle is not less than a second wheel speed of another wheel of the plurality of wheels on the same axle and (2) that a predetermined brake torque limit threshold has been reached, the predetermined brake torque limit threshold being preprogrammed into a memory of the electronic control unit as a function of an engine torque of the all-wheel drive vehicle;
- holding the brake torque at the predetermined brake torque limit threshold for a predetermined amount of time;
- and
- updating a prior estimate of the vehicle reference speed of the vehicle based upon the first wheel speed.
A method for updating a vehicle reference speed of an all-wheel drive vehicle during acceleration, the all-wheel drive vehicle having a plurality of wheels, the method comprising:
- determining each wheel of the plurality of wheels is potentially experiencing wheel slippage;
- repeatedly increasing brake torque to at least one wheel of the plurality of wheels on at least one axle until it is determined, via an electronic control unit:
- (1) that a first wheel speed of the at least one wheel on the at least one axle is not less than a second wheel speed of another wheel of the plurality of wheels on the same axle and (2) that a predetermined brake torque limit threshold has been reached, the predetermined brake torque limit threshold being preprogrammed into a memory of the electronic control unit as a function of an engine torque of the all-wheel drive vehicle;
- holding the brake torque at the predetermined brake torque limit threshold for a predetermined amount of time;
- and
- updating a prior estimate of the vehicle reference speed of the vehicle based upon the first wheel speed.
A braking system for a vehicle that updates a vehicle reference speed of an all-wheel drive vehicle during acceleration, the all-wheel drive having a plurality of wheels, the braking system comprising:
- a braking system;
- an electronic control unit (ECU) for controlling the braking system, the ECU configured to:
- repeatedly increase brake torque to at least one wheel of a plurality of wheels on at least one axle until it is determined (1) that a first wheel speed of the at least one wheel on the at least one axle is not less than a second wheel speed of another wheel of the plurality of wheels on the same axle and (2) that a predetermined brake torque limit threshold has been reached, the predetermined brake torque limit threshold being preprogrammed into a memory of the electronic control unit as a function of an engine torque of the all-wheel drive vehicle;
- hold the brake torque at the predetermined brake torque limit threshold for a predetermined amount of time;
- and
- update a prior estimate of the vehicle reference speed of the vehicle based upon the first wheel speed.
Dependencies are inferred from the claim text.