Method and system for achieving constant average impact deceleration independent of vehicle load

• US 20040078127A1
• Filed: 10/19/2002
• Published: 04/22/2004
• Est. Priority Date: 10/19/2002
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Johnson, Nancy L., Browne, Alan Lampe
• Granted Patent: US 6,879,897 B2
• Time in Patent Office: Days
• US Class Current: 701/45
• CPC Class Codes: B60R 19/00 Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions reinforcement elements for side doors B60J5/0412; mudguards B62D
• CPC Class Codes: B60R 2019/007 Means for adjusting or regulating the crash absorption capacity of the vehicle, e.g. when detecting an impending collision
• CPC Class Codes: B60R 2019/262 with means to adjust or regulate the amount of energy to be absorbed
• CPC Class Codes: B60R 21/01516 using force or pressure sensing means
• CPC Class Codes: B62D 21/15 having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body bumpers B60R19/02; shock absorbers in general F16F

Abstract

A method for achieving a constant average deceleration of a vehicle is disclosed. In an exemplary embodiment, the method includes comparing an effective load mass of the vehicle to a baseline load mass. If the effective load mass differs from the baseline load mass by at least a designated percentage, then upon detection of a vehicle impact, energy absorbing structures within the vehicle are adjusted so as to alter crush forces of the vehicle, thereby resulting in a desired average deceleration of the vehicle.

Claims

1. A method for achieving a constant average deceleration of a vehicle, the method comprising:

comparing an effective loaded mass of the vehicle to a baseline loaded mass; and

if said effective loaded mass differs from said baseline loaded mass by at least a designated percentage, then upon detection of a vehicle impact, adjusting energy absorbing structures within the vehicle so as to alter crush forces of the vehicle, thereby resulting in a desired average deceleration of the vehicle.

2. The method of claim 1, further comprising:

determining a gross loaded vehicle mass;

determining, for each occupant of the vehicle, occupant mass and restraint status information, said occupant restraint status information indicative of whether said occupant is restrained within the vehicle; and

calculating said effective loaded mass of the vehicle, based upon said gross loaded vehicle mass and said occupant mass and restraint status information.

3. The method of claim 2, wherein:

if said effective loaded mass exceeds said baseline loaded mass by at least said designated percentage, then a stroking force of at least one selected energy absorbing structure is increased upon detection of a vehicle impact.

4. The method of claim 2, wherein:

if said effective load mass is less than said baseline load mass by at least said designated percentage, then a stroking force of at least one selected energy absorbing structure is decreased upon detection of a vehicle impact.

5. The method of claim 2, wherein:

if said effective loaded mass exceeds said baseline loaded mass by at least said designated percentage, then a stroking force of at least one selected energy absorbing structure is increased upon detection of a vehicle impact; and

if said effective load mass is less than said baseline load mass by at least said designated percentage, then a stroking force of at least one selected energy absorbing structure is decreased upon detection of a vehicle impact.

6. The method of claim 5, wherein said at least one selected energy absorbing structure includes at least one of:

an expandable space-filling crush structure, an inflatable structure, a metallic bellows, a piston, a compressible space-filling crush structure, a pneumatic stroking device, a hydraulic stroking device, and a magnetorheological material stroking device.

7. The method of claim 2, wherein:

said gross loaded vehicle mass is determined from load sensors within the vehicle;

said occupant mass and restraint status information is determined from seat load sensors and seat belt use sensors within the vehicle.

8. A method for achieving a constant average deceleration of a vehicle, the method comprising:

determining a gross loaded vehicle mass;

determining, for each occupant of the vehicle, occupant mass and restraint status information, said occupant mass and restraint status information indicative of whether said occupant is restrained within the vehicle;

calculating an effective loaded mass of the vehicle, based upon said gross loaded vehicle mass and said occupant mass and restraint status information;

comparing said effective loaded mass of the vehicle to a baseline loaded mass; and

if said effective loaded mass differs from said baseline loaded mass by at least a designated percentage, then upon detection of either a vehicle impact or an imminent vehicle impact, adjusting energy absorbing structures within the vehicle so as to alter crush forces of the vehicle, thereby resulting in a desired average deceleration of the vehicle.

9. The method of claim 8, wherein:

if said effective loaded mass exceeds said baseline loaded mass by at least said designated percentage, then a stroking force of at least one selected energy absorbing structure is increased upon detection of a vehicle impact; and

if said effective load mass is less than said baseline load mass by at least said designated percentage, then a stroking force of at least one selected energy absorbing structure is decreased upon detection of a vehicle impact.

10. The method of claim 9, wherein said at least one selected energy absorbing structure includes at least one of:

an expandable space-filling crush structure, an inflatable structure, a metallic bellows, a piston, a compressible space-filling crush structure, a pneumatic stroking device, a hydraulic stroking device, and a magnetorheological material stroking device.

11. The method of claim 9, wherein:

said gross loaded vehicle mass is determined from load sensors within the vehicle;

said occupant mass is determined from seat load sensors within the vehicle; and

said occupant restraint status information is determined from seat belt use sensors within the vehicle.

12. The method of claim 9, wherein:

said vehicle impact is determined from at least one impact sensor within the vehicle; and

said imminent vehicle impact is determined from at least one robust pre-impact sensor within the vehicle.

16. The method of claim 9, wherein said at least one selected energy absorbing structure includes at least one of:

an expandable space-filling crush structure, an inflatable structure, a metallic bellows, a piston, a compressible space-filling crush structure, a pneumatic stroking device, a hydraulic stroking device, and a magnetorheological material stroking device.

13. A system for achieving a constant average deceleration of a vehicle, comprising:

a system controller;

a plurality of load sensors included in the vehicle and in communication with said system controller;

a plurality of seat load sensors in the vehicle and in communication with said system controller;

a plurality of seat belt use sensors in the vehicle and in communication with said system controller;

at least one impact sensor for detecting a vehicle impact, said at least one impact sensor in communication with said system controller; and

at least one energy absorbing structure within the vehicle;

wherein, if an effective loaded mass of the vehicle differs from a baseline loaded mass by at least a designated percentage, then said system controller causes said at least one energy absorbing structure to be adjusted so as to alter crush forces of the vehicle, thereby resulting in a desired average deceleration of the vehicle.

14. The system of claim 13, wherein said system controller calculates said effective loaded mass by:

determining a gross loaded vehicle mass from said load sensors;

determining, for each occupant of the vehicle, occupant mass and restraint status information from said plurality of seat load sensors and said plurality of seat belt use sensors, said occupant mass and restraint status information indicative of the mass of any unbelted occupants of the vehicle; and

reducing said gross loaded vehicle mass by the mass of unbelted occupants.

15. The system of claim 13, wherein:

if said effective loaded mass exceeds said baseline loaded mass by at least said designated percentage, then said system controller causes a stroking force of at least one selected energy absorbing structure to be increased upon detection of a vehicle impact; and

if said effective load mass is less than said baseline load mass by at least said designated percentage, then said system controller causes a stroking force of at least one selected energy absorbing structure to be decreased upon detection of a vehicle impact.