Priming control system for fuel injected engines
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United States of America Patent
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Apr 25, 1995
Grant Date -
N/A
app pub date -
May 5, 1993
filing date -
May 5, 1993
priority date (Note) -
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Abstract
In a microprocessor-based electronic engine control system or ECU for electronic fuel injection which determines the amount of fuel to be injected on the basis of engine RPM and throttle opening position, modified by factors derived from sensed conditions of the engine and the environment, a single, long pulse width priming fuel pulse is injected upon cranking the engine. The priming fuel pulse is selected as an inverse function of engine temperature and delivered to the throttle bodies within a first period of time after the engine is initially turned over. The engine revolutions are counted until the engine starts. If the engine fails to reach a predetermined RPM for a predetermined time period (indicating that it has been successfully started) within a certain number of revolutions of the crankshaft, then a second priming pulse is delivered. The pulse width of the second pulse is independent of the pulse width of the first priming pulse but is again dependent on the engine temperature. The sets of first and second pulse widths correlated to engine temperature are preferably stored in ECU look-up table memory.
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