Ignition limp home circuit for electronic engine control systems

Details Ignition limp home circuit for electronic engine control systems Ignition limp home circuit for electronic engine control systems

1978-02-27

1981-01-13

Gruber, Felix D.

Boots, shoes, and leggings

123486, 371 11, F02P 508, F02P 1106

Patent

active

042453151

ABSTRACT:
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 absolute pressure, throttle position, engine coolant temperature, air temperature, engine speed or period and the like. These parameters are measured and their value or status is 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 particular computer-commanded engine control operation and output circuitry responds to predetermined computer-generated commands and to the computed digital words for converting it into a corresponding pulse-width control signal for controlling such engine operations as fuel-injection, ignition timing, proportional and/or on-off EGR control, and the like. The engine control system further includes "limp home" circuitry for enabling the engine to function for a predetermined time even after the microprocessor fails to enable the vehicle to get to a place of repair or the like.

REFERENCES:
patent: 4094274 (1978-06-01), Harada et al.
patent: 4099495 (1978-07-01), Kiencke et al.
patent: 4127092 (1978-11-01), Fresow et al.
patent: 4128082 (1978-12-01), Aoki

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