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Engine control system for maintaining idle speed

Image Number 4 for United States Patent #5492094.

An engine controller (12) controls engine idle speed via control of a bypass throttle valve (96) and an ignition timing system (88). The ignition system (88) also provides a retard in ignition timing during cold operation to rapidly warm a catalytic converter (20) coupled to the engine exhaust (48). When first entering the idle speed control mode, an initial throttle position corresponding to an initial desired inducted mass air flow is first provided as a function of predetermined conditions such as air conditioner status. This initial value (238, and 402-412) is corrected to prevent any decrease in idle speed which would otherwise occur as a result of the afore-mentioned retard in ignition timing.

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