Method for recreating valid calibration data for an engine control module

• US 20050071075A1
• Filed: 09/30/2003
• Published: 03/31/2005
• Est. Priority Date: 09/30/2003
• Status: Active Grant

• Current Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Original Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Inventors: Avery, Richard M. Jr., Super, Leopold, Letang, Dennis
• Granted Patent: US 6,941,219 B2
• Time in Patent Office: Days
• US Class Current: 701/115
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F02D 41/2435 characterised by the writing medium, e.g. bar code
• CPC Class Codes: F02D 41/2487 Methods for rewriting
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An engine control module, and method for operating the same for controlling an internal combustion engine. The engine control module comprising a processor for executing instructions to controlled the engine. The engine control module partitioning its memory used to store calibration data. The memory is partitioned into user-changeable and non-user-changeable portions. Only the user-changeable portions are repeatedly backed up. These portions are backed up such that the engine control module can recreate valid calibration data when a memory failure has occured and the engine control module.

Claims

1. A method for operating an engine control module having a volatile memory and a first non-volatile memory, the engine control module operable for copying data between the memories, such as calibration data used to control operation of the engine, the method comprising:

partitioning the volatile memory and the first non-volatile memory into user-changeable and non-user-changeable portions, the portions including calibration data for use by the engine control module to control an engine; and

copying only the user-changeable portion of the volatile memory to the first non-volatile memory for storage in response to changing of the calibration data stored at the volatile memory.

2. The method of claim 1 further comprising backing up the user-changeable portion of the first non-volatile memory prior to receiving the changed calibration data, the backing up comprising copying only the user-changeable portion of the first non-volatile memory to a second non-volatile memory for storage.

3. The method of claim 2 wherein the backing up comprises compressing the user-changeable portion of the first non-volatile memory prior to copying to the second non-volatile memory, the second-volatile memory correspondingly storing a compressed version of the user-changeable portion of the first non-volatile memory.

4. The method of claim 2 further comprising verifying the calibration instruction copied to the first non-volatile memory prior to backing up the calibration data to the second non-volatile memory.

5. The method of claim 4 further comprising copying to the volatile memory in response to rebooting of the engine control module one of (i) the user-changeable and non-user-changeable portions of the first non-volatile memory or (ii) the entire second non-volatile memory and the non-user-changeable portion of the first non-volatile memory.

6. The method of claim 5 wherein the user-changeable and non-user-changeable portions of the first non-volatile memory is copied to the volatile memory if the first non-volatile memory is without defects.

7. The method of claim 5 wherein the entire second non-volatile memory and the non-user-changeable portion of the first non-volatile memory are copied to the volatile memory if the first non-volatile memory is defective.

8. The method of claim 5 further comprising uncompressing the entire second non-volatile memory if copied to the volatile memory.

9. The method of claim 1 wherein partitioning the memory comprises predefining which portions of the memory includes data which may be changed based on the engine operation controlled by the data.

10. A method for limiting memory failure of a engine control module, the method comprising:

partitioning a volatile memory and a first non-volatile memory of the engine control module into user-changeable and non-user-changeable portions, the portions including calibration data for use by the engine control module to control an engine; and

copying only the user-changeable portion of the volatile memory to the user-changeable portion of the first non-volatile memory in response to changing of the calibration data stored at the volatile memory to limit memory failure due to repeatedly copying the calibration data to the first non-volatile memory.

11. The method of claim 10 further comprising backing up the user-changeable portion of the first non-volatile memory prior to receiving the changed calibration data, the backing up comprising copying only the user-changeable portion of the first non-volatile memory to a second non-volatile memory for storage.

12. The method of claim 11 wherein the backing up comprises compressing the user-changeable portion of the first non-volatile memory prior to copied to the second non-volatile memory, the second-volatile memory correspondingly storing a compressed version of the user-changeable portion of the first non-volatile memory.

13. The method of claim 11 further comprising verifying the calibration instruction copied to the first non-volatile memory prior to backing up the calibration data to the second non-volatile memory.

14. The method of claim 13 further comprising copying to the volatile memory in response to rebooting of the engine control module one of (i) the user-changeable and non-user-changeable portions of the first non-volatile memory or (ii) the entire second non-volatile memory and the non-user-changeable portion of the first non-volatile memory.

15. The method of claim 14 wherein the user-changeable and non-user-changeable portions of the first non-volatile memory is copied to the volatile memory if the first non-volatile memory is without defects.

16. The method of claim 14 wherein the entire second non-volatile memory and the non-user-changeable portion of the first non-volatile memory are copied to the volatile memory if the first non-volatile memory is defective.

17. The method of claim 14 further comprising uncompressing the entire second non-volatile memory if copied to the volatile memory.

18. The method of claim 10 wherein partitioning the memory comprises predefining which portions of the memory include data which may be changed based on the engine operation controlled by the data.

19. An engine control module for controlling an internal combustion engine, the engine control module comprising:

a processor for executing instruction to control the engine;

a first non-volatile memory having first and second partitions, the first partition storing engine calibration data classified as user-changeable, the second partition storing engine calibration data classified a non-user-changeable;

a volatile memory that is loaded with the contents of both the first and second non-volatile memory partitions at reset of the engine control module such that the engine control module operates using the volatile memory wherein the processor executes data to control the engine in accordance with the user-changeable and non-user-changeable parameters;

wherein, in response to the changing of the user-changeable engine calibration data in the volatile memory, the engine controller is configured to copy only the user-changeable engine calibration data from the volatile memory to the first partition of the first non-volatile memory.

20. The engine control module of claim 19 further comprising a second non-volatile memory, the engine control module configured to verify the changes to the changed first-partition and to copy the changed first partition of the non-volatile memory to the second non-volatile memory if the changes are verified.