AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

Title:

AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

Japanese Patent JP3677784

Kind Code:

B2

Abstract:

PURPOSE: To improve air-fuel ratio control precision during a time starting from the starting of an engine to the start of feedback control of an air-fuel ratio.
CONSTITUTION: When an oxygen sensor 9 is activated after the starting of an engine 1, feedback control of an air-fuel ratio by using an oxygen sensor 9 and an air-fuel ratio learning correction value L#AST is learnt by a water temperature Tw and a lapse time TMAST after starting, which serve as a parameter. Meanwhile, during a time starting from the starting of the engine 1 to the start of feedback control of an air-fuel ratio, a water temperature Tw and an air-fuel ratio learning correction value LαAST after a starting corresponding to a lapse time TMAST after a starting are estimated based on a learning result of an air-fuel ratio learning correction value LAST.

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Inventors:

Hirofumi Tsuchida

Application Number:

JP32757693A

Publication Date:

August 03, 2005

Filing Date:

December 24, 1993

Export Citation:

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Assignee:

Nissan Motor Co., Ltd

International Classes:

F02D45/00; F02D41/04; F02D41/06; F02D41/14; F02D41/34; (IPC1-7): F02D41/14; F02D41/04; F02D41/06; F02D41/34; F02D45/00

Domestic Patent References:

JP60153446A
JP60224956A
JP4043838A
JP61025952A
JP5026083A
JP5214993A
JP60261948A
JP61190139A

Attorney, Agent or Firm:

Tomijio Sasashima

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