Vehicle-mounted electronic control apparatus

A vehicle-mounted electronic control and equipment technology, which is applied to vehicle components, circuits or fluid pipelines, transportation and packaging, etc., can solve the problem of inability to erase data, etc.
CN102555950AInactive Publication Date: 2012-07-11DENSO CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DENSO CORP
Publication Date
2012-07-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a vehicle-mounted electronic control apparatus (21), which comprises a selection circuit (34). The selection circuit is connected with the voltage of the first power supply line (22) of a battery (5) through an ignition switch (2) and is also connected with the voltage of the second power supply line (23) of the battery (5) through the normally open contact (4a) of a main relay (4). The selection circuit is also connected with the voltage of the third power supply line (24) of the battery (5) through the coil (4b) of the main relay (4). Then the highest voltage among the above three voltages is adopted by the selection circuit. The selection circuit can continue provide the voltage of the battery to a power supply line (35) regardless of the on-off state of the ignition switch. Meanwhile, circuits, such as the RAM (10) of a micro computer (7) and the like, can be continuously operated by the selection circuit. In addition, a flash (135) can be initialized through a simplified operation, wherein the battery is disconnected and then is connected again.
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Description

technical field

[0001] The present invention relates to an on-vehicle electronic control device that controls the supply of electric power from a battery regardless of the state of an ignition switch.

[0002] The present invention also relates to an on-vehicle electronic control device that initializes data in a nonvolatile memory when an operation is started after a battery is disconnected and connected again. Background technique

[0003] Conventional vehicle-mounted electronic control devices disclosed in Patent Documents 1, 2, etc., such as Figure 10 configured as shown in the example.

[0004] [Patent Document 1] JP 2005-307851 A (US 2005 / 0236900 Al)

[0005] [Patent Document 2] JP 2006-105001 A (US 2006 / 0072365 Al)

[0006] In this conventional in-vehicle electronic control device, an electronic control device (hereinafter referred to as ECU) 1 that controls a vehicle engine turns on a main relay 4 through a drive circuit 3 when an ignition switch 2 is turned on. ...

Claims

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