Gm Global Technolgoy Operations, Inc.

Howard Hans Ludwig

David C Poirier

Patrick J Westphal

Douglas C Campbell

Fred G Wood

Youssef A Ghoneim

William C Lin

Yuen-Kwok Chin

Stephen R Pastor

Hsien Heng Chen

Edward John Bedner

Michael Douglas Rizzo

Ronald Paul

Douglass L Carson

Mutasim Abdurrahman Salman

Kevin Austin O'Dea

David M Sidlosky

Michael Paul Turski

Steven L Tracht

Alan J Lee

Duane Edward Bassett

Scott D Morrison

Edmund Stanley Browalski

Vivek Jaikamal

In a vehicle with a first operating mode in which all vehicle wheels have substantially no lateral movement on a road surface and a second operating mode in which at least some of the vehicle wheels have lateral movement on the road surface, and with an actuator capable of affecting vehicle yaw rate, a vehicle yaw rate control method comprising the steps of: measuring an actual vehicle yaw rate; measuring vehicle steering wheel position; in the second mode of operation, determining a desired yaw rate command linearly responsive to the measured steering wheel position; wherein the actuator is controlled to minimize a difference between the measured vehicle yaw rate and the desired vehicle yaw rate.

Chassis control system

A brake control system method according to the steps of: determining driver commanded yaw rate; measuring actual yaw rate; determining a yaw rate error; determining, in response to vehicle conditions, a yaw rate dead band wherein the yaw rate dead band varies with vehicle conditions; comparing the yaw rate error to the dead band; and if the yaw rate error exceeds the dead band, controlling the vehicle responsive to the yaw rate error, wherein yaw rate control only occurs when the yaw rate error exceeds the dead band.

Brake control system

A vehicle yaw rate control method comprising the steps of: first estimating vehicle yaw rate responsive to a first set of criteria; second estimating vehicle yaw rate responsive to a second set of criteria, wherein the first set of criteria includes a first vehicle condition not included in the second set of criteria and wherein the second set of criteria includes a second vehicle condition not included in the first set of criteria; measuring vehicle yaw rate using a yaw rate sensor; and indicating a reverse travel condition if both of the first and second estimates have signs opposite to a sign of the measured vehicle yaw rate.

A vehicle suspension comprises dampers changeable between low and high damping modes and normally operated in the low damping mode. A damper control stores a plurality of sets of reference numbers as a function of vehicle velocity, the reference numbers of each set representing limit values of throttle velocity for the low damping mode for a given transmission gear mode. The reference numbers of each set increase in value with increasing vehicle velocity in a continuously non-linear manner so as to compensate for the decreasing acceleration and body lift produced by a given throttle velocity as vehicle velocity increases. The control changes the damper from low to high damping during vehicle acceleration for a predetermined time when the throttle velocity exceeds a throttle velocity limit reference derived from the reference number corresponding to the vehicle velocity in the set corresponding to the selected transmission gear mode. The control further changes the dampers from low to high damping for a predetermined time when vehicle deceleration exceeds a reference, when a transmission shift occurs or when engine torque first exceeds a reference.

Selectable damping vehicle suspension control responsive to engine torque

Selectable damping vehicle suspension control

A vehicle suspension comprises dampers changeable between low and high damping modes and normally operated in the low damping mode. A damper control stores a plurality of sets of reference numbers as a function of vehicle velocity, the reference numbers of each set representing limit values of throttle velocity for the low damping mode for a given transmission gear mode. The reference numbers of each set increase in value with increasing vehicle velocity in a continuously non-linear manner so as to compensate for the decreasing acceleration and body lift produced by a given throttle velocity as vehicle velocity increases. The control changes the damper from low to high damping during vehicle acceleration for a predetermined time when the throtle velocity exceeds a throttle velocity limit reference derived from the reference number corresponding to the vehicle velocity in the set corresponding to the selected transmission gear mode. The control further changes the dampers from low to high damping for a predetermined time when vehicle deceleration exceeds a reference, when a transmission shift occurs or when engine torque first exceeds a reference.

Selectable damping vehicle suspension control responsive to transmission

Growing community of inventors

Eastpoint, MI, United States of America

Howard Hans Ludwig