Abstract: A fuel injection system for an internal combustion engine utilizing output signals from existing "dual magneto" ignition system to produce output pulses in synchronism with the revolution of the output shaft. A pressure transducer measures the pressure in the intake manifold while a control system generates a VALVE OPEN signal in synchronism with the magneto signal and having a duration proportional to the pressure in the intake manifold to open the fuel injectors and provide fuel to the engine. A special engine starting fuel schedule, hot enrichment schedule, cold enrichment schedule and auto-lean fuel schedule are also generated by the control system.

Abstract: An electronic and mechanical fuel feeding system comprises a mechanical fuel induction system coupled with an electronic fuel injection system through a diverter valve in fluid communication with a mechancial pump. The diverter valve includes a valve actuator responsive to an electrical signal to couple the inlet of the diverter valve with the outlet of the valve connected in fluid communication with electronically controlled injector nozzles. Alternatively, absence of an electrical control signal at the valve actuator causes coupling of the inlet of the diverter valve to a second outlet coupled in fluid communication with a mechanical carburetion system. In the preferred embodiment, the electronic fuel injection system comprises a control circuit responsive to changes in engine speed, manifold pressure, exhaust gas temperature and cylinder temperature so that accurately metered amounts of fuel are delivered by the injector nozzles to the engine cylinders.