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Method for improving storage accuracy of automotive electronic control unit mileage data

An electronic control unit and data storage technology, applied in static memory, instruments, etc., can solve the problems of deviation of total mileage, short life of EEPROM storage, etc., and achieve the effect of long service life, safe and efficient storage

Active Publication Date: 2013-07-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of short EEPROM storage life and deviation of total mileage caused by damage to individual storage units when EEPROM is used to store vehicle electronic control unit mileage, and proposes a method for improving the storage accuracy of vehicle electronic control unit mileage

Method used

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  • Method for improving storage accuracy of automotive electronic control unit mileage data
  • Method for improving storage accuracy of automotive electronic control unit mileage data
  • Method for improving storage accuracy of automotive electronic control unit mileage data

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Experimental program
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specific Embodiment approach 1

[0018] Specific implementation mode 1. Combination figure 1 ~8 describes the method of improving the storage accuracy of the mileage data of the vehicle electronic control unit, the specific process is as follows:

[0019] Step 1. Allocate and initialize the storage unit in the EEPROM to store the mileage data of the vehicle electronic control unit; wherein, the space of each storage unit occupies two bytes, and the position number of the storage unit is from 0 to 15, and the initial value of each storage unit is The value is set to 0xFFFF;

[0020] Step 2, when the vehicle starts, read the total mileage data from the EEPROM into the vehicle electronic control unit memory; wherein, the total mileage data S is equal to the sum of all storage unit data plus 15;

[0021] Step 3. When reading the total mileage from the EEPROM, analyze the vehicle electronic control unit mileage data in the storage unit, identify the damaged storage unit, and correct the invalid vehicle electronic...

specific Embodiment approach 2

[0025] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the specific steps of identifying the damaged storage unit described in step 3 are as follows:

[0026] Step 3-1: Extract the features of the vehicle electronic control unit mileage data in the storage unit:

[0027] The smallest total mileage data in the latest 16 updated total mileage data is S min =16a+b, the largest total mileage data is S max =16a+b+15 (0≤a, 0≤b≤15), when b=0, the minimum total mileage is located on the storage unit numbered 0, S min =16a, the maximum total mileage is located on the storage unit numbered 15, S max =16a+15, the data on each storage unit is equal to [S / 16]=a, when b≠0, the minimum total mileage is located on the storage unit numbered b, and the maximum total mileage is located on the numbered storage unit On the storage unit of b-1, S max =16a+b+15=16(a+1)+(b-1), the data on the storage unit from 0 to b-1 of the position number is all ...

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Abstract

The invention discloses a method for improving storage accuracy of automotive electronic control unit mileage data, and relates to the technical field of automotive electronics. The method aims at solving the problems that an EEPROM (electrically erasable programmable read-only memory) is short in storage life, and deviation of the total mileage is caused by damage of an individual storage unit when the EEPROM is used for storing the automotive electronic control unit mileage. The method comprises the steps that Step 1, storage units are distributed and initialized in the EEPROM to store the automotive electronic control unit mileage data; Step 2, when an automobile is started, the total mileage data is read from the EEPROM to an automotive electronic control unit memory; Step 3, the automotive electronic control unit mileage data in the storage units is analyzed, the damaged storage unit is identified, and the invalid automotive electronic control unit mileage data is corrected; and Step 4, when the automobile is driven, the total mileage data is renewed to the EEPROM in real time. The method is applicable to the technical field of the automotive electronics.

Description

technical field [0001] The invention relates to the technical field of automotive electronics. Background technique [0002] Vehicle electronic control unit mileage data is generally stored using EEPROM (Electrically Erasable Programmable Read-Only Memory), which is a memory chip that does not lose data after power failure. After the engine is turned off, the mileage data of the vehicle electronic control unit is stored in the EEPROM. After the engine is started next time, the electronic control unit can read the total mileage after the last driving from the EEPROM. If the ordinary data storage method is adopted, the mileage data of the vehicle electronic control unit is directly stored in a fixed storage unit of the EEPROM. Since the mileage data of the vehicle electronic control unit must be frequently updated when driving, it is easy to cause this fixed storage unit to repeat. Write and erase, and the upper limit of the number of write / erase operations for each storage u...

Claims

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Application Information

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IPC IPC(8): G11C29/08
Inventor 李正超高会军于金泳王海鹏许雲淞裴一飞张立宪
Owner HARBIN INST OF TECH
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