Switching control of solenoid current in fuel injection systems

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123492, 323 23, G05B 1126, F02M 5100, H03K 3281




A method and apparatus for controlling the various functions of an internal combustion engine using a program-controlled microprocessor having a memory preprogrammed with various control laws and associated control schedules receives information concerning one or more engine-operating parameters such as manifold pressure, throttle position, engine coolant temperature, air temperature, engine speed or period and the like. These parameters are sensed and then supplied to input circuits for signal conditioning and conversion into digital words usable by the microprocessor. The microprocessor system computes a digital word indicative of a computer-commanded engine control operation, and output circuitry responds to predetermined computer-generated commands and to the computed digital command words for outputting corresponding pulse-width control signals for controlling such engine operations as fuel-injection, ignition timing, proportional and/or on-off EGR control, and the like.

patent: 3474576 (1973-07-01), Gordon et al.
patent: 3721836 (1973-03-01), Rippel
patent: 3786344 (1974-01-01), Davis et al.
patent: 4054828 (1977-10-01), Conzelmann et al.


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