Control method for air-fuel ratio

Abstract

Abstract PURPOSE: To perform accurate air-fuel ratio control in the entire running range of an engine, by controlling the air fuel ratio on the basis of compensated information corresponding to the running condition of the engine, among pieces of compensated information which are corrected by the output of an air-fuel ratio sensor and stored. CONSTITUTION: Receiving an interruption instructing signal supplied from a rotational frequency counter 101, an interruption controller 102 sends out an interruption signal for calculation of an injected quantity of fuel to stop the main routine of a central processing unit 100. The CPU100 receives a sucked quantity of air from an analogue input port 104 and an engine's rotational frequency from a rotational frequency counter 101 and reads various kinds of compensated quantities for fuel injection, which are compensated by the output of an air-fuel ratio sensor 14 and stored in a random access memory 107, to perform the compensated calculation of the injected quantity. The injected quantity of fuel thus calculated with compensation is set in a counter 109 to control a fuel injection valve 5. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Toshio Kondo
• 👤 Akio Kobayashi
• 👤 Tomomi Sakaeno
• 👤 Shigehiko Tajima

Bibliographic Details