ISC transfer

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Description:

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Transfer function for the ISC actuator. Initial values for this function should come directly from flow data provided by fuel systems. Data must be generated at the expected idle vacuum setting for each particular application. Subsequent data generated in the airflow prediction study, as described in the desired RPM section, can be used to fine-tune the transfer function as sufficient numbers of vehicles are sampled. The calibrated leakage is subtracted from DESMAF to obtain the actual flow required from the ISC actuator. This value, clipped as a minimum allowed actuator airflow, becomes the input to the ISC duty cycle transfer function. Output is the specified ISC duty cycle.