ACTIVE TUNING SYSTEM FOR ENGINE CONTROL UNIT

• US 20150006066A1
• Filed: 06/27/2013
• Published: 01/01/2015
• Est. Priority Date: 06/27/2013
• Status: Active Grant

• Current Assignee: HONDATA Incorporated
• Original Assignee: HONDATA Incorporated
• Inventors: Stevens, Derek
• Granted Patent: US 9,371,792 B2
• Time in Patent Office: Days
• US Class Current: 701/115
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 35/027 using knock sensors
• CPC Class Codes: F02D 41/062 for starting F02D41/061 takes precedence
• CPC Class Codes: F02D 41/2445 characterised by a plurality of learning conditions or ranges
• CPC Class Codes: F02D 41/2451 characterised by what is learned or calibrated
• CPC Class Codes: F02D 41/2454 Learning of the air-fuel ratio control
• CPC Class Codes: F02D 41/2493 Resetting of data to a predefined set of values
• CPC Class Codes: F02D 41/263 the program execution being modifiable by physical parameters
• CPC Class Codes: F02P 5/151 with means for compensating the variation of the characteristics of the engine or of a sensor, e.g. by ageing
• CPC Class Codes: F02P 5/152 dependent on pinking detecting or indicating knocks in internal-combustion engines G01L23/22
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for an engine control unit to update internal tables based on feedback from the engine without external computing, comprising the steps of establishing flash memory and RAM memory in the ECU, assigning a portion of the RAM memory to storage of a table of engine conditions from the flash memory, updating all program code pointers to the table to read the table from the assigned portion of RAM, and revise the table in RAM based on input received from the engine sensors.

Claims

1. A method for an engine control unit to update internal tables based on feedback from the engine without external computing, comprising the steps of:

establishing flash memory and RAM memory in the ECU;

assigning a portion of the RAM memory to storage of a table of engine conditions from the flash memory;

updating all program code pointers to the table to read the table from the assigned portion of RAM; and

revise the table in RAM based on input received from the engine sensors.

2. The method of claim 1, wherein an engine sensor includes an oxygen sensor.

3. The method of claim 1, wherein an engine sensor includes an engine knock sensor.

4. The method of claim 1, wherein an engine sensor includes a cam angle position sensor.

5. The method of claim 1, wherein an engine sensor includes an engine load sensor.

6. The method of claim 1, wherein at engine start-up, the ECU copies tables from flash memory after a cold boot, and saves previous values of the tables where no cold boot occurs.

7. The method of claim 1, wherein a knock count is summed from a knock count sensor, and a knock count adjustment value is increased by a step size if the knock count sum is increased when compared with a previous knock count sum.

8. The method of claim 1, wherein a current knock adjustment value is calculated from values in a knock adjustment table, an engine noise table, and index values for engine conditions.

9. The method of claim 1, wherein a lambda sensor delay is determined to account for a delay between a lambda sensor reading and a change in engine conditions.