Gm Global Technolgoy Operations, Inc.

Other

Gordon L Tierney

Stephen R Pastor

Ronald Paul

Douglass L Carson

Dean E McCulloch

Bruce D Lockhart

Cyrus A Wehner

Mutasim Abdurrahman Salman

Donald L Parker

Donald E Schenk

Todd R Brown

Michael Douglas Rizzo

David Alan Thatcher

Robert J Hammersmith

Alan J Lee

Eldon Gerrald Leaphart

John E Dickinson

Duane Edward Bassett

Hong Xing Hu

In a vehicle with an active brake control system a control method comprising to the steps of: determining individual wheel speeds of the vehicle wheels responsive to sensor output signals (,); determining a vehicle reference velocity responsive to the individual wheel speeds (,); measuring vehicle yaw rate (,); determining a delta velocity for each wheel responsive to the individual wheel speed for the wheel and the vehicle reference velocity (,); and when the active brake control system is in the active state for at least one of the wheels, (a) setting a base delta velocity for the one wheel equal to the delta velocity for the one wheel immediately prior to the active brake control obtaining the active state for the one wheel (,); (b) determining a control term responsive to the measured vehicle yaw rate (,), wherein the control term represents a desired delta velocity for the one wheel; (c) setting a first target change in delta velocity responsive to the base delta velocity and the control term (,); and (d) controlling a first wheel brake for the one wheel so that a difference between the delta velocity for the one wheel and the desired delta velocity for the one wheel is minimized (,).

Brake control system

A sensor-responsive control method for use on a motor vehicle, comprising the steps of: measuring a vehicle yaw rate; measuring a vehicle lateral acceleration; responsive to the measured yaw rate and lateral acceleration, estimating a steering wheel angle; determining an error signal responsive to the difference between the estimated steering wheel angle and an adaptive steering position signal; and updating the adaptive steering position signal responsive to the error signal, wherein the adaptive steering position signal is quickly determined after the vehicle begins to move.

Sensor-responsive control method and apparatus

The present invention is directed to a method and apparatus for estimating incline and bank angles of a road surface upon which a front wheel drive vehicle is travelling. Each nondriven rear wheel is equipped with a rotational speed sensor. The vehicle is further equipped with longitudinal and lateral accelerometers mounted to the vehicle chassis above the centerline of the rear axle. Outputs from the speed sensors and accelerometers are fed into a vehicle on-board controller and utilized in computing the incline and bank angles of the road surface. Updated incline and bank angles are maintained in the controller's memory for access by various control systems to alter vehicle attributes for improved handling and operation.

Method and apparatus for estimating incline and bank angles of a road

To provide an ABS/TC integration and method of utilization thereof which is an alternative to those previously provided and to maximize the utilization of the actuator in both the ABS and TC functions the present invention is brought forth. The present invention provides an ABS/TC integration with a common actuator which maximizes the operation of the actuator when in either an ABS or TC braking mode.

Combined traction control and anti-lock braking system

A traction controller which modulates brake pressure to prevent excessive wheel spin in each of the driven wheels of a vehicle senses a side to side spin cycling condition of the driven wheels and increases the brake pressure of the driven wheel having the lesser of the two driven wheel brake pressures to a larger percentage of the other driven wheel brake pressure to inhibit the side to side spin cycling condition. The side to side spin cycling condition is represented by one driven wheel accelerating with a positive jerk value while the other driven wheel is decelerating with a negative jerk value.

Vehicle traction control system

A traction control system for limiting the slip of a driven wheel determines an excessive spinning condition of the wheel in response to an excess driving torque applied from the vehicle engine. If the vehicle speed is less than a predetermined value, a braking force is applied to the wheel that is a predetermined function of the spin ratio of the wheel and when the vehicle speed is greater than the predetermined value, a braking force is applied to the wheel that is a predetermined function of the difference between the driven wheel speed and the vehicle speed.

Entitled vehicle traction control system

The net engagement pressure of a torque converter clutch is controlled in response to a commanded slip and a slip error indication, for isolating engine torque perturbations from the vehicle driveline. The transmission of an excessive level of engine speed perturbation is detected and used to develop a correction amount for the measured slip. The correction amount increases the slip error indication and causes the slip to be controlled at a higher level, thereby reducing the amount of transmitted engine torque perturbation.

Closed loop clutch slip control system with turbine roughness control

The net engagement pressure of a torque converter clutch having a negative slope capacity vs. slip characteristic is controlled to stably regulate the clutch slip, and thereby isolate engine torque perturbations from the vehicle driveline. The pressure is scheduled with a proportional term responsive to transient slip speed deviations and an integral term responsive to steady state slip speed deviations. Feed forward terms responsive to the throttle changes which force steady state slip speed deviations act to increase the speed of response of the integral term.

Growing community of inventors

Washington, MI, United States of America

Gordon L Tierney