Delphi Technologies, Inc.

Other

Steven Paul Loudon

Eric Edward Krueger

Kevin Austin O'Dea

Michael John Check

Aleksander Boguslaw Hac

Hsien Heng Chen

Edward John Bedner

Michael Douglas Rizzo

Bryan Todd Fulmer

Eldon Gerrald Leaphart

Raymond Kurt Schubert

Andrew A Beach

Todd David Brown

Kevin J Zelenka

Julien Guiet

Noise produced during a supplemental brake apply is reduced eliminated by reducing the quantity of additional brake fluid supplied to the pump during the apply. The prime valve is opened only at the initiation of the supplemental apply to supply a predetermined small quantity of brake fluid to the accumulator and pump inlet and is then closed for the remainder of the apply. The quantity of extra fluid supplied can be retained by the accumulator and does not need to by blown off back to the master cylinder. The apply valve of the non-regulated wheel brake is controlled to regulate pressure to the regulated wheel brake through the apply valve thereof, which is left open while the release valve of the regulated wheel brake is left closed. The release valve of the non-regulated wheel is controlled to maintain a lower pressure at the non-regulated wheel, preferably equal to the master cylinder pressure whenever possible, while permitting fluid flow back to the accumulator. The more even flow of this arrangement through the circuit permits operation with the smaller quantity of extra brake fluid. The reduction in blow-off events reduces objectionable noise produced by the blow-off valve when the vehicle operator initiates manual brake apply during a supplemental apply.

Method of controlling a brake valve apparatus

The invention provides a method of progressive engagement of all-wheel drive for a mobile vehicle. A set of vehicle parameters is sensed, and an all-wheel drive lock value is determined based on the sensed set of vehicle parameters. Vehicle subsystem control activation is determined, and the all-wheel drive lock value is adjusted based on the vehicle subsystem control activation determination. An all-wheel drive controller is engaged based on the adjusted all-wheel drive lock value.

Method and system for progressive engagement of all-wheel drive

A system and method of vehicle stability enhancement control the method comprising the steps of determining a Delta Velocity of the vehicle, determining one of an understeer and an oversteer condition of the vehicle, applying a percentage of the Delta Velocity to an outside front and an outside rear wheel in the oversteer condition, and applying a percentage of the Delta Velocity to an inside front and an inside rear wheel in the understeer condition. The system and method may further comprise the step of applying the Delta Velocity to a rear wheel during the oversteer condition or applying the Delta Velocity to a front wheel during the understeer condition using fluid pressure from a master cylinder when braking is occurring.

System and method for vehicle stability enhancement control with surface estimate

A vehicle brake control providing understeer correction through an increase in differential brake pressure favoring the inside wheel applies the increase, in the absence of anti-lock braking activity, across the rear wheels unless one or more sensors indicates a likely low traction condition on the inside rear wheel, in which case the increase is applied to the front pair of wheels. Preferred sensors include a suspension position sensor for the inside rear wheel or other sensor derived information from a suspension control system that indicates large body roll in a turn together with forward body pitch. In the absence of a suspension control system, preferred sensors include vehicle lateral and longitudinal accelerometers indicating vehicle roll and pitch together with a steer angle sensor indicating a significant turn. An indication could also be derived from a normal force sensor on the wheel or normal force information derived from other sensors such as a tire pressure sensor.

Vehicle braking apparatus having understeer correction with axle selection

An integrated active steering and braking control system for providing one or more corrective yaw moments to a vehicle in response to a plurality of signals indicative of operational and environmental conditions related to the vehicle is disclosed. The system comprises a reference model, an estimator, a vehicle level brake/steer controller, and an actuator controller. The reference model provides a feedforward front steering angle correction signal a feedforward rear steering angle correction signal, a desired yaw rate signal, a desired lateral velocity signal, and a desired side slip angle signal. The estimator provides an estimated surface coefficient of adhesion signal, an estimated lateral velocity signal, and an estimated side slip angle signal. In response to the signals from the reference model and the estimator, the vehicle level brake/steer controller provides either a desired speed differential signal, a desired front steering angle signal and/or a desired rear steering angle signal. The actuator controller selectively provides a corrective braking signal to a brake actuator, a corrective front steering signal to a steering actuator, and a corrective rear steering signal to the steering actuator as a function of the desired speed differential signal, the desired front steering angle signal, and the desired rear steering angle signal, respectively.

Integrated control of active tire steer and brakes

A system and method of vehicle stability enhancement control during ABS operation, the method comprising the steps of determining whether ABS mode is active; determining whether VSE is required; calculating a target wheel speed for each wheel if ABS mode is active and VSE is required; calculating an adjusted wheel slip for each wheel by subtracting the wheel speed for each wheel from the target wheel speed for each wheel and dividing the difference by the target wheel speed for each wheel; and determining an ABS control mode for each wheel using the adjusted wheel slip. The method further provides the step of calculating the target wheel speed for each wheel, in which the step of calculating the target wheel speed for each wheel further comprises adding a VSE modification term for each wheel to the vehicle speed to calculate the target wheel speed.

System and method for vehicle stability enhancement control during ABS operation

A motor vehicle mounted system is responsive to sensed or estimated vehicle lateral acceleration and vehicle speed for detecting and signaling when the vehicle is operating on a racetrack. The system determines whether the vehicle is in a high lateral acceleration state or a low lateral acceleration state and when the vehicle is maintaining a minimum speed. The system increments a count when the vehicle is in the high lateral acceleration state if the vehicle has maintained the minimum speed for a first time since the last increment or decrement of the count and decrements the count when the vehicle is in the low lateral acceleration state if the vehicle has maintained the minimum speed for a second time since the last increment or decrement of the count. The system detects and signals operation on a racetrack while the count exceeds a predetermined threshold count and otherwise detects and signals no operation on a racetrack. Racetrack driving is thus detected through repeated episodes of high lateral acceleration during high speed turns on racetrack curves and corners.

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Howell, MI, United States of America

Steven Paul Loudon