Title:
AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JPS6397819
Kind Code:
A
Abstract:
PURPOSE:To stabilize an air-fuel ratio, by a method wherein, by introducing secondary air during low load running in that an accel pedal is stepped on from an idling posi tion, the generation of a catalyst smell is prevented, and by stopping introduction of the secondary air during idling, feedback of an air-fuel ratio is performed. CONSTITUTION:In an internal combustion engine, a catalyst converter 1a is disposed in an exhaust pipe 1. In this case, a means 2, controlling introduction of secondary air to the upper stream of the catalyst converter 1a, and a means 3, adapted to control an air-fuel ratio of air-fuel mixture introduced to the internal combustion engine, is provided. Further, means 4 and 5, performing closed loop control and opening loop control, respectively, of an air-fuel ratio controlled by the air-fuel ratio control means 3, are provided. Moreover, a means 6 is provided for discriminating whether an air-fuel ratio is a closed loop control condition or an opening loop control condition according to the running state of the internal combustion engine and switching the control conditions. And a control means 7 is provided for actuating the opening loop control means 5 in a non-idling state under a partial lead state and actuating the secondary air introducing means 2.
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Inventors:
SATO YASUSHI
Application Number:
JP24208086A
Publication Date:
April 28, 1988
Filing Date:
October 14, 1986
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/22; F02D41/00; F02D41/14; (IPC1-7): F01N3/22; F02D41/14
Attorney, Agent or Firm:
Aoki Akira