Boots – shoes – and leggings
Patent
1989-05-08
1990-11-13
Chin, Gary
Boots, shoes, and leggings
180142, 180143, 280 91, B62D 602
Patent
active
049706470
ABSTRACT:
A rear wheel steering system in which the rear steering command is retrieved from a three dimensional (3D) lookup table as a function of both front wheel steering angle and vehicle speed in normal operating modes, and from a two dimensional (2D) lookup table as a function of front wheel steering angle without regard to the vehicle speed under conditions where the vehicle speed information is deemed not credible. If the measured vehicle speed is judged to be not credible, it is replaced with an estimated or recently measured credible vehicle speed value, and the replacement value is then used in connection with the measured front wheel steering angle signal to retrieve a rear wheel steering command from the 3D lookup table. However, when the front wheels have been returned to the straight ahead position, the rear wheel steering angle command is retrieved from the 2D lookup table as a sole function of the measured front wheel steering angle. When the vehicle speed signal abnormality is corrected and the front wheels are returned to the straight ahead position, the system reverts to the normal operating mode in which the rear steering command is retrieved from the 3D lookup table as a function of both the front wheel steering angle and the measured vehicle speed.
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patent: 4893825 (1990-01-01), Janson
Goings Janet S.
Karadsheh Sam M.
Mackovjak John M.
Morrison Scott D.
Chin Gary
General Motors Corporation
Navarre Mark A.
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