Adjusting automobile suspension system

• US 4,371,191 A
• Filed: 02/20/1980
• Issued: 02/01/1983
• 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:
  US06/123,024
• Time in Patent Office: 1,077 Days
• Field of Search: 280/707, 280/691, 280/661
• US Class Current: 280/5.501
• CPC Class Codes: B60G 17/0163 the control involving steering geometry, e.g. four-wheel steering
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 2200/46 camber angle
• CPC Class Codes: B60G 2200/4622 Alignment adjustment
• CPC Class Codes: B60G 2200/464 Caster angle
• CPC Class Codes: B60G 2204/14 Mounting of suspension arms
• CPC Class Codes: B60G 2204/62 Adjustable continuously, e.g. during driving
• 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 7/003 of adjustable length
• 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, the forces acting on such vehicle and/or the type of road surface for example when the vehicle is navigating a turn and/or accelerating or braking. 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, the magnitude of longitudinal forces acting on the vehicle, the individual rotational wheel speed at each wheel of the vehicle and camber of each wheel with respect to the vehicle body. In response to the sensed change in the vehicle'"'"'s attitude, the sensed forces acting upon such vehicle, and/or the type of road surface monitored by a central control processor, a series of servo mechanisms are activated to alter the camber of each wheel to optimize tire contact with the road surface, as well as to adjust other suspension parameters (toe-in/toe-out caster, wheel height, wheel track) of each wheel due to mechanical misconfigurations that become inherent in certain suspension designs when servo-mechanisms alter the camber of each wheel.

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 centrifugal force acting on said vehicle;

sensing means on said vehicle to sense longitudinal forces acting on said vehicle due to acceleration or deceleration;

control means carried by said vehicle to receive sensed changes in vehicle performance as indicated by the said sensing means;

said control means including means to alter and adjust camber, castor, toe-in/out, or wheel track of each said wheel with respect to said vehicle chassis to maintain optimum road contact between each said wheel and the road based on a correlation of the factors sensed by said sensing means.

2. An adjusting vehicle suspension system for a vehicle as defined in claim 1 including sensing means associated with each said wheel to sense rotational speed of each said wheel.

3. An adjusting vehicle suspension system for a vehicle as defined in claim 1 including sensing means on said vehicle to sense changes in steering wheel direction of said vehicle.

4. An adjusting vehicle suspension system for a vehicle as defined in claim 1 including sensing means associated with each said wheel to sense rotational speed of each said wheel and sensing means on said vehicle to sense changes in steering wheel direction of said vehicle.

11. An adjusting vehicle suspension system for a vehicle as defined in claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 wherein said means to adjust at least one selected attitude of each said wheel includes activated means operative to alter and adjust each said wheel'"'"'s attitude responsive to a signal received from said control means.

12. An adjusting vehicle suspension system for a vehicle as defined in claim 11 including servo control means operative to control said activated means responsive to said signal received from said control means.

13. An adjusting vehicle suspension system for a vehicle as defined in claim 12 including means at each said wheel to sense the actual degree of said wheel'"'"'s attitude.

14. An adjusting vehicle suspension system for a vehicle as defined in claim 13 including means to send the sensed changes in wheel attitude from said wheel attitude sensing means to said servo control means whereby said servo control means is operative to adjust the wheel attitude until the signal received from said control means equals the signal received from said wheel attitude sensing means.

15. An adjusting vehicle suspension system for a vehicle as defined in claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 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 attitude adjustments responsive to such short duration conditions.

16. An adjusting vehicle suspension system for a vehicle as defind in claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 wherein said control means includes means for adjusting and altering a wheel'"'"'s attitude responsive to sensed static load distribution in said vehicle.

17. An adjusting vehicle suspension system for a vehicle as defined in claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 wherein said control means for adjusting and altering a wheel'"'"'s attitude includes means to adjust said wheel'"'"'s attitude to a predetermined neutral position when said vehicle is in a skid attitude.

18. An adjusting vehicle suspension system for a vehicle as defined in claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 including means to detect a malfunction in the system to lock out said means to alter and adjust a wheel'"'"'s attitude and maintain each wheel in a predetermined neutral attitude when a malfunction in said control means is sensed.

5. 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 centrifugal force acting on said vehicle;

sensing means associated with each said wheel to sense rotational speed of each said wheel;

control means carried by said vehicle to receive sensed changes in vehicle performance as indicated by the said sensing means;

said control means including means to alter and adjust camber, castor, toe-in/out, or wheel track of each said wheel with respect to said vehicle chassis to maintain optimum road contact between each said wheel and the road based on a correlation of the factors sensed by said sensing means.

6. An adjusting vehicle suspension system for a vehicle as defined in claim 5 including sensing means on said vehicle to sense changes in steering wheel direction of said vehicle.

7. 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 longitudinal forces acting on said vehicle due to acceleration or deceleration;

control means carried by said vehicle to receive sensed changes in vehicle performance as indicated by the said sensing means;

said control means including means to alter and adjust camber, castor, toe-in/out, or wheel track of each said wheel with respect to said vehicle chassis to maintain optimum road contact between each said wheel and the road based on a correlation of the factors sensed by said sensing means.

8. An adjusting vehicle suspension system for a vehicle as defined in claim 7 including sensing means associated with each said wheel to sense rotational speed of each said wheel.

9. 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 associated with each said wheel to sense rotational speed of each said wheel;

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

control means carried by said vehicle to receive sensed changes in vehicle performance as indicated by the said sensing means;

said control means including means to alter and adjust camber, castor, toe-in/out, or wheel track of each said wheel with respect to said vehicle chassis to maintain optimum road contact between each said wheel and the road based on a correlation of the factors sensed by said sensing means.

10. 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 associated with each said wheel to sense rotational speed of each said wheel;

sensing means on said vehicle to sense longitudinal forces acting on said vehicle due to acceleration or deceleration;

control means carried by said vehicle to receive sensed changes in vehicle performance as indicated by the said sensing means;

said control means including means to alter and adjust camber, castor, toe-in/out, or wheel track of each said wheel with respect to said vehicle chassis to maintain optimum road contact between each said wheel and the road based on a correlation of the factors sensed by said sensing means.