Vehicle parameter infrastructure security strategy

• US 8,365,037 B2
• Filed: 01/03/2007
• Issued: 01/29/2013
• Est. Priority Date: 01/03/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Katrak, Kerfegar K., McCullough, Scott A.
• Primary Examiner(s): ABRAHAM, ESAW T
• Application Number:
  US11/619,203
• Publication Number:
  US 20080157951A1
• Time in Patent Office: 2,218 Days
• Field of Search: 714/758, 714/807, 701/29
• US Class Current: 714/758
• CPC Class Codes: G05B 19/0428 Safety, monitoring G05B19/0423 takes precedence

Abstract

A method and apparatus is provided for improving integrity in data representing a plurality of condition states of a variable, including the steps of determining which condition states are operationally incompatible with one another, and generating an array of transformed integer values including a separate integer value for each condition state. The transformed integer value for each condition state in binary form is at least two bit errors removed from any transformed integer value for an identified incompatible condition state in binary form.

Claims

1. A method for improving integrity in data representing a plurality of condition states of a variable, the method comprising the steps of:

determining which condition states are operationally incompatible with one another using one or more processors; and

generating an array of transformed integer values using the one or more processors by changing initial integer values of each of the condition states to transformed integer values for the condition states, such that the transformed integer values for the condition states comprise a separate transformed integer value for each condition state, such that the transformed integer value for each condition state in binary form is at least two bit errors removed from any transformed integer value for an identified incompatible condition state in binary form.

2. The method of claim 1, wherein the condition states are determined to be operationally incompatible with one another if the condition states cannot occur together at the same time during operation of the vehicle.

3. The method of claim 1, further comprising the steps of:

redundantly identifying the transformed integer value from the generated array of transformed integer values corresponding with each of the one or more initial values; and

comparing the redundantly identified transformed integer values from step (e) with the corresponding identified transformed integer values from step (d).

4. The method of claim 3, further comprising the step of:

taking remedial action if one or more of the redundantly identified transformed integer values is not equal to the corresponding identified transformed integer value.

5. The method of claim 1, wherein:

the transformed integer values for at least two of the identified incompatible condition states include at least a 5 and a 6.

6. The method of claim 1, wherein the transformed integer values for at least two of the identified incompatible condition states are selected from the group consisting of:

5, 6, 9, and 10.

7. The method of claim 1, wherein the transformed integer values for at least two of the identified incompatible condition states are selected from the group consisting of:

3, 5, and 6.

8. The method of claim 1, wherein the data further represents a plurality of condition states of at least one additional variable, the method further comprising the steps of:

determining which condition states of the at least one additional variable are operationally incompatible with one another; and

generating an array of transformed integer values comprising an integer value for each condition state of the at least one additional variable, such that;

each condition state of a particular additional variable has a separate transformed integer value; and

the transformed integer value for each condition state of an additional variable in binary form is at least two bit errors removed from any transformed integer value for an identified incompatible condition state in binary form.

9. The method of claim 8, wherein the variable is vehicle power mode (with condition states including at least power off, run, accessory, and crank), the additional variables include at least engine run status (with condition states including at least not running, running and idling, and running and not idling), and transmission gear status (with condition states including at least reverse and any gear except reverse), and wherein:

the transformed integer values for the condition states of the power mode variable are selected from the group consisting of;

5, 6, 9, and 10;

the transformed integer values for the condition states of the engine run status variable are selected from the group consisting of;

3, 5, and 6; and

the transformed integer values for the condition states of the transmission gear status variable are selected from the group consisting of;

3 and 5.

10. The method of claim 9, wherein:

the transformed integer value for the power off condition state of the power mode variable is 5;

the transformed integer value for the run condition state of the power mode variable is 10;

the transformed integer value for the accessory condition state of the power mode variable is 6;

the transformed integer value for the crank condition state of the power mode variable is 9;

the transformed integer value for the not running condition state of the engine run status variable is 3;

the transformed integer value for the running and idling condition state of the engine run status variable is 5;

the transformed integer value for the running and not idling condition state of the engine run status variable is 6;

the transformed integer value for the reverse condition state of the transmission gear status variable is 3; and

the transformed integer value for the any gear except reverse condition state of the transmission gear status variable is 5.

11. A method for improving integrity in data representing a plurality of condition states of a plurality of variables, the variables including at least a vehicle power mode variable (with condition states including at least power off, run, accessory, and crank), an engine run status variable (with condition states including at least not running, running and idling, and running and not idling), and a transmission gear status variable (with condition states including at least reverse and any gear except reverse), and wherein the method comprises the steps of:

receiving initial values representing a plurality of condition states for a variable representing a vehicle operational parameter; and

generating an array of transformed integer values using a processor by changing the initial values of each of the condition states to transformed integer values for the condition states, such that the transformed integer values for the condition states comprise a separate transformed integer value for each condition state, such that;

the transformed integer values are different for each condition state of the variable; and

the transformed integer value for each condition state in binary form is at least two bit errors removed from the transformed integer values for each of the other condition states in binary form.

12. The method of claim 11, wherein each of the condition states are operational inconsistent with one another.

13. The method of claim 11, wherein the variable is selected from the group consisting of a power mode of the vehicle, an engine run status of the vehicle, and a transmission gear status of the vehicle.

14. The method of claim 13, further comprising the step of:

taking remedial action if one or more of the redundantly identified transformed integer values is not equal to the corresponding identified transformed integer value wherein the transformation is performed separately for each of the following variables;

the power mode of the vehicle, the engine run status of the vehicle, and the transmission gear status of the vehicle.

15. The method of claim 14, wherein:

the transformed integer values for the condition states of the power mode variable are selected from the group consisting of;

5, 6, 9, and 10;

the transformed integer values for the condition states of the engine run status variable are selected from the group consisting of;

3, 5, and 6; and

the transformed integer values for the condition states of the transmission gear status variable are selected from the group consisting of;

3 and 5.

16. The method of claim 15, wherein:

the transformed integer value for the power off condition state of the power mode variable is 5;

the transformed integer value for the run condition state of the power mode variable is 10;

the transformed integer value for the accessory condition state of the power mode variable is 6;

the transformed integer value for the crank condition state of the power mode variable is 9;

the transformed integer value for the not running condition state of the engine run status variable is 3;

the transformed integer value for the running and idling condition state of the engine run status variable is 5;

the transformed integer value for the running and not idling condition state of the engine run status variable is 6;

the transformed integer value for the reverse condition state of the transmission gear status variable is 3; and

the transformed integer value for the any gear except reverse condition state of the transmission gear status variable is 5.

17. An apparatus for improving integrity in data representing a plurality of condition states of a variable, the apparatus comprising:

means for receiving one or more initial values representing the condition states of the variable;

means for determining which condition states are operationally incompatible with one another; and

means for generating an array of transformed integer values by changing the initial values, such that the transformed integer values comprise a separate integer value for each condition state, such that the transformed integer value for each condition state in binary form is at least two bit errors removed from any transformed integer value for an identified incompatible condition state in binary form.

18. The apparatus of claim 17, further comprising:

means for identifying the transformed integer value from the generated array of transformed integer values corresponding with each of the one or more initial values.

19. The method of claim 18, further comprising:

means for redundantly identifying the transformed integer value from the generated array of transformed integer values corresponding with each of the one or more initial values; and

means for comparing the redundantly identified transformed integer values with the corresponding identified transformed integer values.

20. The method of claim 19, further comprising:

means for taking remedial action if one or more of the redundantly identified transformed integer values is not equal to the corresponding identified transformed integer value.