Adjusting automobile suspension system

• US 4,191,274 A
• Filed: 08/22/1977
• Issued: 03/04/1980
• Est. Priority Date: 08/22/1977
• Status: Expired due to Term

• Current Assignee: Spring Hill Laboratories Incorporated
• Original Assignee: Spring Hill Laboratories Incorporated
• Inventors: Goldberg, Jerome, Bloch, Christopher D.
• Primary Examiner(s): Bertsch, Richard A.
• Application Number:
  US05/826,709
• Time in Patent Office: 925 Days
• Field of Search: 280/707, 280/6 R, 280/6 H, 280/6.11, 280/661, 180/103 R
• US Class Current: 180/282
• CPC Class Codes: B60G 17/0162 mainly during a motion involving steering operation, e.g. cornering, overtaking B60G17/0164 takes precedence
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 2204/14 Mounting of suspension arms
• CPC Class Codes: B60G 3/26 Means for maintaining substantially-constant wheel camber during suspension movement ; Means for controlling the variation of the wheel position during suspension movement B60G3/202, B60G3/22, B60G7/003, B60G7/006 take precedence; means for adjusting camber, castor, or toe-in B62D17/00
• CPC Class Codes: B60G 7/006 Attaching arms to sprung or unsprung part of vehicle, characterised by comprising attachment means controlled by an external actuator, e.g. a fluid or electrical motor B62D7/146 takes precedence
• CPC Class Codes: B62D 17/00 Means on vehicles for adjusting camber, castor, or toe-in

Abstract

An adjusting automobile suspension system providing a controlled camber response to the attitude of a vehicle, for example when the vehicle is navigating a turn. The system includes sensors that monitor the magnitude of centrifugal and vertical forces on the vehicle, the direction and degree that the steering wheel is being turned and camber of each wheel with respect to the vehicle body. In response to the sensed change in the vehicle'"'"'s attitude, monitored by a central control processor, a series of servo mechanisms are activated to alter the camber of each wheel to maximize tire contact with the road.

Claims

1. An adjusting vehicle suspension system for a vehicle having a chassis and an individual suspension system at each wheel of the vehicle comprising

sensing means at each wheel of the vehicle to sense the height of the vehicle chassis with respect to each said wheel;

sensing means on said vehicle to sense changes in steering wheel direction of said vehicle;

sensing means on said vehicle to sense centrifugal force acting on said vehicle;

control means carried by said vehicle to receive the sensed changes in vehicle height with respect to each said wheel, changes in steering wheel direction of said vehicle and centrifugal force acting on said vehicle;

said control means including means for controlling camber adjustment means at each said wheel to effect changes in wheel camber to maintain optimum road contact between each said wheel and the road according to a predetermined camber for each wheel based on a correlation of the centrifugal force acting on the vehicle displacement of the vehicle sensed at each wheel.

2. An adjusting vehicle suspension system for a vehicle as defined in claim 1 wherein said camber adjustment means at each said wheel includes activated means operative to adjust each said wheels camber responsive to a signal received from said control means.

3. An adjusting vehicle suspension system for a vehicle as defined in claim 2 including servo control means operative to control said activated means responsive to said signal received from said control means.

4. An adjusting vehicle suspension system for a vehicle as defined in claim 3 including means at each said wheel to sense the actual degree of wheel camber of each wheel.

5. An adjusting vehicle suspension system for a vehicle as defined in claim 4 including means to send the sensed changes in wheel camber from said wheel camber sensing means to said servo control means whereby said servo control means is operative to adjust wheel camber until the signal received from said control means equals the signal received from said wheel camber sensing means.

6. An adjusting vehicle suspension system for a vehicle as defined in claim 1 including means within said control means to discern between vehicle conditions of short duration such as bumps and rapid steering wheel direction changes to preclude wheel camber adjustments responsive to such short duration conditions.

7. An adjusting vehicle suspension system for a vehicle as defined in claim 1 wherein said control means includes means to adjust wheel camber responsive to sensed static load distribution in said vehicle.

8. An adjusting vehicle suspension system for a vehicle as defined in claim 1 wherein said control means includes means for adjusting wheel camber at each wheel to a neutral camber position when said vehicle is sensed to be in a skid attitude.

9. An adjusting vehicle suspension system for a vehicle as defined in claim 1 including means to detect a malfunction in the system to lock out said camber adjustment means at each wheel and maintain each said wheel at a neutral camber attitude when a malfunction is sensed.

10. An adjusting vehicle suspension system for a vehicle as defined in claim 1 wherein said activated means comprises hydraulically activated means.