Adaptive Crash Height Adjustment Using Active Suspensions

• US 20140195113A1
• Filed: 01/08/2013
• Published: 07/10/2014
• Est. Priority Date: 01/08/2013
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Lu, Jianbo, Hrovat, Davor, Pilutti, Thomas E., Tseng, Eric H., Filev, Dimitar P., Engleman, Jerry H.
• Granted Patent: US 8,892,304 B2
• Time in Patent Office: Days
• US Class Current: 701/37
• CPC Class Codes: B60G 17/0165 to an external condition, e.g. rough road surface, side wind
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 2400/823 Obstacle sensing
• CPC Class Codes: B60G 2500/30 Height or ground clearance
• CPC Class Codes: B60G 2600/02 Retarders, delaying means, dead zones, threshold values, cut-off frequency, timer interruption
• CPC Class Codes: B60G 2600/182 Active control means
• CPC Class Codes: B60G 2800/222 during collision

Abstract

A vehicle crash safety system includes a pre-crash sensing system configured for gathering and/or receiving target vehicle ride-height data, and at least one actuator operatively coupled to the sensing system and configured for adjusting a height of a portion of a host vehicle responsive to a command from the sensing system. A timing of the command is responsive to an estimated dynamic response time of the at least one actuator.

Claims

1. A vehicle crash safety system comprising:

a pre-crash sensing system configured for gathering and/or receiving target vehicle ride-height data; and

at least one actuator operatively coupled to the sensing system and configured for adjusting a height of a portion of a host vehicle responsive to a command from the sensing system, the sensing system being configured for timing the command responsive to an estimated dynamic response time of the at least one actuator.

2. The safety system of claim 1 wherein the pre-crash sensing system is configured for generating host vehicle dynamics data, a target vehicle threat assessment, and target vehicle bumper or doorsill location data, and wherein the system further comprises a Dynamic State Self-Tuning (DSST) controller in electronic communication with said pre-crash sensing system, said DSST controller generating a reference ride-height signal as a function of said host vehicle dynamics data, target vehicle threat assessment, and target vehicle bumper or doorsill location data;

and a Rule-Based Height Regulator (RBHR) controller in operative communication with said DSST controller and an adjustable suspension system,

3. The safety system of claim 2 wherein the RBHR controller is programmed to adjust the height of the portion of the vehicle by operating the at least one actuator, in response to said reference ride-height signal and measured host vehicle suspension height, when said target vehicle threat assessment indicates an imminent crash event;

and wherein said RBHR controller output modifies said host vehicle suspension height as a function of a height-error signal related to said target and host vehicle ride-heights, and said RBHR incorporates a multivariable rule-based strategy for vehicle suspension height adjustment.

4. The safety system of claim 1 wherein the at least one actuator is a relatively slow-response actuator.

5. The safety system of claim 1 wherein the at least one actuator is a relatively fast-response actuator.

6. The safety system of claim 1 wherein the a pre-crash sensing system includes a controller configured to formulate a representation of a dynamic response of the at least one actuator.

7. The safety system of claim 1 wherein the sensing system includes a blind spot warning system, and wherein the height-adjustment command is generated responsive to input from the blind spot warning system.

8. The safety system of claim 1 wherein said pre-crash sensing system comprises at least one of a vision system, radar system, lidar system, or transponder/receiver system.

9. The safety system of claim 1 wherein said target vehicle threat assessment data includes target range, closing velocity, approach angle and target vehicle type.

10. The safety system of claim 1 wherein said vehicle dynamics data includes vehicle speed, yaw rate, steering wheel angle and bumper height.

11. The safety system of claim 8 wherein said pre-crash sensing system comprises a sensor fusion stage producing said target vehicle threat assessment as a weighted output of signals from at least two of said vision system, radar system, lidar system, or transponder/receiver system.

12. A vehicle crash safety system comprising:

a pre-crash sensing system configured for gathering and/or receiving target vehicle ride-height data; and

at least one actuator operatively coupled to the sensing system and configured for changing a height of a portion of the vehicle responsive to a command, wherein the command is generated responsive to a level of downforce to be applied to a road surface by at least one vehicle wheel.

13. The safety system of claim 12 wherein the system is configured for timing initiation of the command responsive to an estimated dynamic response time of the at least one actuator.

14. The safety system of claim 12 wherein the at least one actuator is configured to control timing of application of vehicle brakes.

15. The safety system of claim 12 wherein the a pre-crash sensing system is configured for generating host vehicle dynamics data, a target vehicle threat assessment, and target vehicle bumper or doorsill location data, and wherein the system further comprises a Dynamic State Self-Tuning (DSST) controller in electronic communication with said pre-crash sensing system, said DSST controller generating a reference ride-height signal as a function of said host vehicle dynamics data target vehicle threat assessment, and target vehicle bumper or doorsill location data;

a Rule-Based Height Regulator (RBHR) controller in operative communication with said DSST controller and an adjustable suspension system, said RBHR controller programmed to adjust the host vehicle suspension height by said suspension system, in response to said reference ride-height signal and measured host vehicle suspension height, when said target vehicle threat assessment indicates an imminent crash event; and

wherein said DSST controller and said RBHR controller comprise a centralized ride-height controller architecture separate from said adjustable suspension system.