Electronic control apparatus and method for writing backup data in electronic control apparatus

An electronic control device and data backup technology, applied in information storage, static memory, instruments, etc., can solve problems such as abnormal data writing, inability to start the vehicle in time, and inconvenience in restarting the electronic control device.

Inactive Publication Date: 2008-05-07
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, some problems may arise, for example, the inconvenience caused by the restart delay of the electronic control unit, so that the device cannot start the vehicle in time
On the other hand, if the writing is forcibly terminated in order to restart the electronic control unit, in some cases, not only an abnormality may occur in the data writing, but also a bad influence may be brought on the memory chip.

Method used

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  • Electronic control apparatus and method for writing backup data in electronic control apparatus
  • Electronic control apparatus and method for writing backup data in electronic control apparatus
  • Electronic control apparatus and method for writing backup data in electronic control apparatus

Examples

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Embodiment Construction

[0013] FIG. 1 is a circuit diagram showing an electronic control device according to an embodiment of the present invention. The electronic control unit 101 shown in FIG. 1 is used to control a vehicle engine (internal combustion engine).

[0014] An electronic control device 101 (engine control microcomputer) for controlling the engine includes a CPU 102 , RAM 103 , nonvolatile flash memory 104 , I / O 105 , and communication I / F 106 .

[0015] In the flash memory 104 (flash EEPROM) which is an electrically rewritable nonvolatile memory, a control program for controlling the engine fuel injection amount, fuel injection timing, ignition timing, idle speed, etc. is stored in advance, and, It is also used to save backup data such as learning data and fault diagnosis information.

[0016] The I / O 105 is provided to receive detection signals from the crank angle sensor, water temperature sensor, air flow sensor, etc., and output control signals to the fuel injection valve, the igni...

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PUM

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Abstract

The invention provides a electronic control apparatus and method for writing backup data in electronic control apparatus. When a power switch is turned OFF, the execution of steady process is stopped, and backup data is written into a flash memory. If the power switch is turned ON during the writing of the backup data, the backup data writing execution is allowed to last for a predetermined time T 1 after an instant when the power switch is turned ON, and if the writing of the backup data is not terminated at the time when the predetermined time T 1 has elapsed, the writing of the backup data is interrupted so that the steady process is started for being executed.

Description

technical field [0001] The present invention relates to an electronic control device including a rewritable nonvolatile memory in which backup data is written during a self-shutoff process after a power switch is turned off, and the present invention It also relates to a method for writing the backup data. Background technique [0002] Japanese Patent Application Laid-Open No. 2002-082841 discloses that, in an electronic control device including a flash memory as an electrically rewritable nonvolatile memory, during the self-disconnection period after the key switch is turned off, the control data is transferred to the flash memory. Write to fast memory. [0003] When it is required to start the next process during writing of data into the flash memory, the electronic control device is set in advance to restart after data writing to the flash memory is completed. However, in this case, some problems may arise, for example, inconvenience caused by the restart delay of the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C16/10
Inventor 星野一也汤泽雅人
Owner HITACHI LTD
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