Internal combustion engine fuel injection control system
AssigneeThe Lucas Electrical Company Limited
InventorJohn Howard Moore
Life of this patent
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Abstract
An i.c. engine fuel injection control includes a corona-discharge type transducer for measuring the mass of air aspirated by the engine. Since such a transducer is humidity sensitive a compensation circuit is provided for automatically applying a humidity correction to the control circuit which is used to control the quantity of fuel injected as a function of the transducer output. This control circuit includes an integrator to which the transducer output is periodically applied and a current source which periodically discharges the integrator, the time taken to discharge determining the quantity of fuel injected. The current source is controlled by the humidity sensitive means, to obtain the required compensation.
Claims7
An internal combustion engine fuel injection control system comprising a corona-discharge type air mass flow transducer, together with an injection control circuit and means sensitive to the humidity of air aspirated into the engine, said injection control circuit including a first circuit part which is responsive to the output of the transducer to generate a control signal and a second circuit part which is sensitive to said control signal and to the output of the humidity sensitive means to generate a signal dependent on the humidity of air aspirated into the engine.
Dependencies are inferred from the claim text.