Title:
AIR-FUEL RATIO CONTROL DEVICE FOR ENGINE
Document Type and Number:
Japanese Patent JP3493697
Kind Code:
B2
Abstract:
PURPOSE: To prevent fluctuation of an air-fuel ratio at the time of half activity of an O2 sensor by changing a control starting timing according to output responsiveness of the O2 sensor when a fuel injection amount is feed back-controlled on the basis of the detection signal of the O2 sensor arranged in an exhaust system.
CONSTITUTION: In an engine 2, air is supplied from an intake pipe 1 through a throttle chamber 4 provided with a throttle valve 5 and a bypass passage 3 provided with an ISCV 7. Fuel is supplied from a fuel injector 6. The ISCV (current control type solenoid valve) 7 and the fuel injector 6 are respectively controlled at least by an ECU(engine control unit) 8 on the basis of the detection signal outputted from an O2 sensor 16 arranged by an exhaust pipe 13. As a result, the air-fuel ratio of air mixture is controlled. In this case, output responsiveness of the O2 sensor 16 is detected by the ECU 8. The feed back control starting timing of a fuel injection amount by the fuel injector 16 is changed in response to the detected output responsivenes.
Inventors:
Shuji Mitsui
Kazufumi Arino
Kazufumi Arino
Application Number:
JP28263193A
Publication Date:
February 03, 2004
Filing Date:
November 11, 1993
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
F02D41/14; (IPC1-7): F02D41/14
Domestic Patent References:
| JP3217635A |
Attorney, Agent or Firm:
Hiroshi Maeda (7 outside)