Motorola Corporation

Jeffrey T Barylak

Jeffrey P Kotowski

A fixed volume receiving cavity (18) of a fuel injector (11) receives fuel from a fuel inlet valve means (23, 24) in accordance with the time duration(T.sub.A) of fuel metering control signal pulses (100). Injection occurrence control signal pulses ( b 101) actuate a compressed air inlet valve means (26-30) connected to the cavity to inject the contents of the cavity through an outlet valve (20) and into a combustion chamber (15) of an engine. The fuel metering pulses (100) are developed by a microprocessor (50). Circuitry (53-66; 70-79,66) separate from and external to the microprocessor receives the fuel metering control signal pulses and provides, in response thereto, the fuel injection occurrence control signal pulses. Use of a fixed volume receiving cavity in the injector, in combination with the time-controlled fuel inlet valve means, eliminates many mechanical likages required in most prior injectors. Deriving the fuel injection occurrence signal pulses from the fuel metering signal pulses allows the microprocessor to produce only a single output signal (Y) to implement fuel injection control.

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Palatine, IL, United States of America

Jeffrey T Barylak