Lucas Industries Public Limited Company

Lucas Electrical Electronics and Systems Ltd.

James J Samuel

Albert R Tingey

In an engine management system which stores a control value and increments or decrements this according to whether an oxygen sensor in the exhaust system indicates that the engine is running lean or rich and which controls the duration of pulses applied to fuel injectors of the engine according to the stored control value, 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.

Electronic control system for an IC engine

In an engine management system which stores a control value FBPOS and increments or decrements this according to whether an oxygen sensor in the exhaust stream indicates that the engine is running lean or rich and which controls the duration of pulses applied to fuel injectors of the engine according to the deviation of the actual control value FBPOS from a reference value, a compensating adjustment is determined and applied to the pulse length duration in order to reduce any difference in the level of the actual control value FBPOS as between the closed-throttle running condition and either the open-throttle running condition or the reference value. The system thus serves to reduce the time taken to readjust upon opening and closing of the throttle and to minimize the emission of pollutants from the engine exhaust.

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Essington, United Kingdom

James J Samuel