Electronic control system for an IC engine.

摘要

In an engine management system which stores a control value (FBPOS) and increments or decrements this according to whether an oxygen sensor (20) in the exhaust system (18) indicates that the engine (10) is running lean or rich and which controls the duration of pulses (32) applied to fuel injectors (26) of the engine according to the stored control value (FBPOS), a compensating adjustment is determined and applied to the pulse length duration in order to maintain the mark/space ratio of the indicating signal from the oxygen sensor at an optimum value. This avoids unacceptable exhaust emissions which might otherwise occur under some conditions.