Acceleration enrichment for closed loop control systems

Details Acceleration enrichment for closed loop control systems Acceleration enrichment for closed loop control systems

1977-09-26

1980-01-22

Myhre, Charles J.

Internal-combustion engines

Noncompression

123 32EA, 123 32ED, 123119EC, F02D 500, F02M 706

Patent

active

041844610

ABSTRACT:
An acceleration enrichment feature for a closed loop fuel management system controlling the air/fuel mixture delivered to an internal combustion engine to regulate the roughness of the engine at a predetermined level. The enrichment feature provides increased fuel to the engine for operator induced transient conditions proportionately by sensing the rate of change of throttle angle. A throttle angle position signal is modified by circuitry providing a transfer function that introduces a lag term into the throttle angle position signal which differentiating the signal to determine the rate of change of throttle angle. The modified throttle angle position signal is additionally corrected by the amount of roughness sensed by the closed loop control and enriched for rough operations of the engine beyond a threshold and leaned for smooth operations of the engine. Acceleration enrichment pulses of a frequency dependent on the magnitude of the corrected throttle position signal are then combined with the basic fuel injection pulses of the closed loop fuel management system to provide a desired A/F ratio during operator induced transients.

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