Controller for air-fuel ratio of engine and ignition timing during idling

Abstract

Abstract PURPOSE:To reduce the variation rate of engine revolution during idling by adding the ignition timing control during idling on the basis of the engine revolution state to the air-fuel control on the basis of the oxygen concentration in exhaust system. CONSTITUTION:When the engine cooling-water temp. is over a certain temp. and an O2 sensor 11 is in activated operation state, the output data of the O2 sensor 11 is read-in, and the air-fuel ratio in the intake system of an engine 31 is controlled by an air-fuel ratio controlling means 14 according to the data. When idle operation state is formed at this time, the output data of the O2 sensor 11 is compared with a standard set value in an ignition timing control means 16 in idling according to the output of an engine revolution state detector 12 including the O2 sensor 11. When the output of the O2 sensor 11 is larger than the standard set value, ignition timing is controlled to the delay side, and when the output is smaller than the set value, ignition timing is controlled to the advance side, and thus the time delay in air-fuel control is dissolved.

Inventors

• 👤 Hideo Ichimura
• 👤 市村　英夫

Bibliographic Details