Air fuel ratio controller

Abstract

Abstract PURPOSE: To quickly end the transient conditions detected by a transistion sensor for an air fuel ratio control unit by changing control gain of a specified time control circuit. CONSTITUTION: In an air fuel ratio control unit which performs feed back control of air bleed for a carbureter, a decision circuit 22 decides whether the signal from an O2 sensor for an exhaust air system represents lean or rich status and compares those signals with a triangle wave in a comparison 24. The triangle wave is supplied from a triangle generation circuit 26 through a PI control circuit 23 which computes proportional integral control. Air bleed solenoid valves 14 and 15 are controled based on this result, thus forming a theoretical air fuel ratio. When the engine comes in transition operation, the signal from a sensor 20 is transmitted to a retension circuit 27 and then output to a selection circuit 29 for a specified time so as to increase the control gain for the PI circuit 23. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Jun Suzuki
• 👤 Hisashi Osano

Bibliographic Details