Electronic control apparatus

A technology of electronic control devices and controllers, applied in electrical control, engine control, electrical digital data processing, etc., can solve time-consuming problems, achieve cost reduction, size reduction, and achieve the effect of calibration

Inactive Publication Date: 2005-08-24
FREESCALE SEMICON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if multiple calibrations are to be performed on a single flash EEPROM, the above-mentioned processing needs to be performed for each calibration, which is very time-consuming

Method used

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Embodiment Construction

[0028] Refer below Figure 1-7 An embodiment of the present invention is described in detail. In this example, if figure 1 As shown, it is assumed that a controlled object 11 such as an automobile engine is controlled by using an electronic control unit (ECU) 10 . That is, after the ECU 10 is installed in an automobile, calibration of control parameters as control data is performed in order to control each unit constituting the automobile.

[0029] The ECU 10 includes a CPU 10, a flash EEPROM 101 as a nonvolatile memory, and a calibration RAM 102 as a volatile memory. The ECU 10 also includes other not-shown devices such as a clock module and an A / D converter. The CPU 10 is configured to execute various programs stored in the flash EEPROM 101, the calibration RAM 102, and the like.

[0030] Flash EEPROM 101 includes data related to control commands and control parameters used by the ECU for control. The flash EEPROM 101 used in this embodiment has a storage capacity of 64...

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Abstract

The objective is to provide an electronic control apparatus capable of overwriting data in a nonvolatile memory, even during control operation. An ECU ( 10 ) includes a CPU ( 100 ), a flash EEPROM 101, and a calibration RAM ( 102 ). When calibration is performed, data in a calibration area of the flash EEPROM ( 101 ) is stored into the calibration RAM ( 102 ). A memory area of the calibration RAM ( 102 ) is overlapped over the calibration area to perform calibration. The data in the calibration area is written into the calibration RAM ( 102 ). When the calibration is completed, a super-user mode is entered in which the data stored in the calibration RAM ( 102 ) is written into the flash EEPROM ( 101 ) by use of a control register ( 113 ).

Description

technical field [0001] The present invention relates to electronic control units for controlling equipment, and more particularly to electronic control units capable of overwriting control data. Background technique [0002] Control data such as a control program and control parameters for controlling the device are stored in a nonvolatile memory (ROM) so that the control data cannot be erased even when the battery is not connected, and are sometimes provided to the user. For example, electronic control units are used to control engines, transmissions, and other automotive components, and the resulting control data is stored in the ROM of the electronic control unit. [0003] When an electronic control unit is installed in a car, the car manufacturer or dealer may wish to calibrate the control data according to the characteristics of the device being controlled, such as the actual engine or transmission. Therefore, control data is usually stored in a rewritable non-volatil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D45/00G06F11/00G06F12/06G06F12/14G11C16/10
CPCG11C16/102G11C16/105
Inventor 佐藤纯桂佐佐木章浩
Owner FREESCALE SEMICON INC
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