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JPS5644822A - Self diagnostic method in air fuel ratio control system - Google Patents

Self diagnostic method in air fuel ratio control system

Info

Publication number
JPS5644822A
JPS5644822A JP12076879A JP12076879A JPS5644822A JP S5644822 A JPS5644822 A JP S5644822A JP 12076879 A JP12076879 A JP 12076879A JP 12076879 A JP12076879 A JP 12076879A JP S5644822 A JPS5644822 A JP S5644822A
Authority
JP
Japan
Prior art keywords
signal
output
check
control circuit
feed back
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP12076879A
Other languages
Japanese (ja)
Inventor
Toshio Ishii
Yasunori Mori
Osamu Abe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12076879A priority Critical patent/JPS5644822A/en
Publication of JPS5644822A publication Critical patent/JPS5644822A/en
Pending legal-status Critical Current

Links

Landscapes

  • Testing Of Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Test And Diagnosis Of Digital Computers (AREA)

Abstract

PURPOSE: To facilitate the trouble discrimination in the control circuit to improve maintainability by a method wherein a signal fed back from the output signal of the switching element operated by a check signal is compared with the check signal at the output terminal.
CONSTITUTION: A feed back loop is configured to feed back the output signals at switching elements Q3, Q4 operated by the check signal sent out of control circuit 3, to the input terminal side, via switching means 26 operated manually or by the check program. And the trouble discrimination is carried out by comparison between the feed back signal and the check signal at the output terminal of control circuit 3. For example, loop switch 26 is turned ON by the activation of the check program and next, a check signal of high level output is applied to the base of transistor Q3. And when the signal fed back to input terminal I1 is not of low level, it is discriminated that the output at output terminal O1 is abnormal.
COPYRIGHT: (C)1981,JPO&Japio
JP12076879A 1979-09-21 1979-09-21 Self diagnostic method in air fuel ratio control system Pending JPS5644822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12076879A JPS5644822A (en) 1979-09-21 1979-09-21 Self diagnostic method in air fuel ratio control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12076879A JPS5644822A (en) 1979-09-21 1979-09-21 Self diagnostic method in air fuel ratio control system

Publications (1)

Publication Number Publication Date
JPS5644822A true JPS5644822A (en) 1981-04-24

Family

ID=14794514

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12076879A Pending JPS5644822A (en) 1979-09-21 1979-09-21 Self diagnostic method in air fuel ratio control system

Country Status (1)

Country Link
JP (1) JPS5644822A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58197551A (en) * 1982-05-12 1983-11-17 Mitsubishi Electric Corp Function checking system of on-vehicle digital computer device
JPS58207157A (en) * 1982-03-29 1983-12-02 キヤリア・コ−ポレイシヨン Self-inspection method and apparatus for microprocessor control section

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58207157A (en) * 1982-03-29 1983-12-02 キヤリア・コ−ポレイシヨン Self-inspection method and apparatus for microprocessor control section
JPS58197551A (en) * 1982-05-12 1983-11-17 Mitsubishi Electric Corp Function checking system of on-vehicle digital computer device

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