Suspension control calibration integrity

• US 7,684,911 B2
• Filed: 06/20/2005
• Issued: 03/23/2010
• Est. Priority Date: 06/20/2005
• 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: Katrak, Kerfegar K., Palazzolo, Steven D., Seifert, Mark A.
• Primary Examiner(s): Black; Thomas G
• Assistant Examiner(s): LOUIE, WAE LENNY
• Application Number:
  US11/157,208
• Publication Number:
  US 20060287790A1
• Time in Patent Office: 1,737 Days
• Field of Search: 701/29, 701/37, 701/38
• US Class Current: 701/37
• CPC Class Codes: B60G 17/06 Characteristics of dampers , e.g. mechanical dampersB60G17/015 takes precedence
• CPC Class Codes: B60G 2600/70 Computer memory; Data storage, e.g. maps for adaptive control
• CPC Class Codes: B60G 2800/7022 Calibration of a sensor, e.g. automatically

Abstract

A vehicle includes a semi-active suspension including suspension dampers controllably adjustable in accordance with electronic stability control commands and ride and handling commands. Vehicle steering response states, turning direction states and vehicle dynamics states are binary coded in respective state variables and suspension control calibrations are binary coded in calibration words. Integrity and security of state variables and calibration words are ensured in efficient binary digit resource allocation schemes.

Claims

1. Method for controlling a vehicular suspension in a vehicle having a plurality of independently controllable suspension units including independent jounce and rebound control capabilities comprising:

providing a calibration memory device having a first pair of bits corresponding to jounce control and a second pair of bits corresponding to rebound control for each of a plurality of predetermined vehicle driving condition states and for each of said plurality of independently controllable suspension units wherein a first complementary arrangement of the first pair of bits corresponds to a first jounce control calibration, and wherein a second complementary arrangement of the first pair of bits corresponds to a second jounce control calibration, and wherein the first complementary arrangement of the second pair of bits corresponds to a first rebound control calibration, and wherein the second complementary arrangement of the second pair of bits corresponds to a second rebound control calibration;

determining which one of the plurality of the predetermined vehicle driving condition states is active;

selecting from the calibration memory device the respective first and second pairs of bits for each of the plurality of independently controllable suspension units corresponding to the active one of the plurality of the predetermined vehicle driving condition states; and

controlling each of the plurality of independently controllable suspension units in accordance with the complementary arrangements of the respective first and second pairs of bits.

2. The method for controlling a vehicular suspension as claimed in claim 1 wherein determining which one of the plurality of the predetermined vehicle driving condition states is active comprises:

providing a memory location within a memory device for storing valid binary codes corresponding to vehicle driving condition states; and

storing within the memory location valid binary codes;

wherein each valid binary code has a first ratio of individual bit states and is differentiated from other valid binary codes by differences between at least two complementary bits.

3. The method for controlling a vehicular suspension as claimed in claim 2 wherein valid binary codes that have no identical adjacent bits correspond to an oversteer vehicle driving condition state.

4. The method for controlling a vehicular suspension as claimed in claim 1 wherein respective first and second pairs of bits are stored in predetermined ones of the first and second complementary arrangements in a non-volatile memory device.

5. The method for controlling a vehicular suspension as claimed in claim 1 wherein respective first and second pairs of bits are set to ones of the first and second complementary arrangements in a read-write memory device as a function of predetermined vehicle operating parameters.

6. The method for controlling a vehicular suspension as claimed in claim 1, wherein jounce and rebound control of each suspension unit are respectively effectuated by one of (i) electronic stability control (ESC) commands, and (ii) ride and handling control (R&

H) commands, depending upon the respective first pair of bits and the second pair of bits.

7. Computer-based vehicular suspension control system for controlling a plurality of independently controllable suspension units including independent jounce and rebound control capabilities comprising:

a programmable controller operating under the control of a program to control each of the plurality of independently controllable suspension units in accordance with calibrations corresponding to a plurality of vehicle driving condition states; and

a calibration memory device having a first pair of bits corresponding to jounce control and a second pair of bits corresponding to rebound control for each of the plurality of predetermined vehicle driving condition states and for each of the plurality of independently controllable suspension units wherein a first complementary arrangement of the first pair of bits corresponds to a first jounce control calibration, and wherein a second complementary arrangement of the first pair of bits corresponds to a second jounce control calibration, and wherein the first complementary arrangement of the second pair of bits corresponds to a first rebound control calibration, and wherein the second complementary arrangement of the second pair of bits corresponds to a second rebound control calibration.

8. The computer-based vehicular suspension control system as claimed in claim 7 wherein said plurality of predetermined vehicle driving condition states are stored as valid binary codes within a memory device wherein each valid binary code is characterized by a predetermined ratio of corresponding bit states and is differentiated from all other valid binary codes by differences between at least two complementary bits of each respective valid binary code.

9. The computer-based vehicular suspension control system as claimed in claim 8 wherein valid binary codes that have no identical adjacent bits correspond to an oversteer vehicle driving condition state.

10. The computer-based vehicular suspension control system as claimed in claim 8 wherein the memory device comprises a non-volatile memory device and the respective first and second pairs of bits are stored therein in predetermined ones of the first and second complementary arrangements.

11. The computer-based vehicular suspension control system as claimed in claim 8 wherein the memory device comprises a read-write memory device and the respective first and second pairs of bits are periodically set therein to ones of the first and second complementary arrangements as a function of predetermined vehicle operating parameters.

12. The computer-based vehicular suspension control system as claimed in claim 7, wherein jounce and rebound control of each suspension unit are respectively effectuated by one of (i) electronic stability control (ESC) commands, and (ii) ride and handling control (R&

H) commands, depending upon the respective first pair of bits and the second pair of bits.