ENGINE FEEDBACK CONTROL SYSTEM AND METHOD

摘要

This disclosure provides a system and method for controlling internal combustion engine system to reduce operation variations among plural engines. The system and method utilizes single-input-single-output (SISO) control in which a single operating parameter lever is selected from among exhaust gas recirculation (EGR) fraction and charge air mass flow (MCF), and a stored reference value associated with the selected lever is adjusted for an operating point in accordance with a difference between a measured emissions characteristic and a pre-calibrated reference value of the emissions characteristic for that operating point. Adjusting the selected operating parameter lever towards the theoretical pre-calibrated reference value of the operating parameter lever for each of plural operating points can reduce engine-to-engine variations in engine out emissions.

主权项

1. A system, comprising:
a selection circuit configured to select, for an operating point of an internal combustion engine, one operating parameter lever and one emissions characteristic, said selected operating parameter lever related to one of an exhaust gas recirculation fraction or a charge air mass flow; a reference retrieving circuit adapted to retrieve a stored pre-calibrated reference value associated with the selected emissions characteristic for the selected operating parameter lever, said pre-calibrated reference value based on predetermined reference data associated with a respective operating point of a nominal internal combustion engine; a difference calculating circuit adapted to:
receive data corresponding to a measured value of the selected emissions characteristic, andcalculate a difference between the pre-calibrated reference value of the selected emissions characteristic for the nominal internal combustion engine and the measured value of the selected emissions characteristic for the internal combustion engine; a controller adapted to provide a control instruction based on the calculated difference; and an operating parameter adjustment circuit adapted to:
receive the control instruction,determine an adjustment factor value based on the control instruction and the operating point,retrieve a stored operating parameter reference value related to selected operating parameter lever for the respective operating point, andstore an adjusted value of the stored operating parameter reference value based on the adjustment factor value.