초록 ▼

A fuel pressure control for an alternate-fuel engine utilizes adaptively learned corrections for fuel injection pulsewidth to dynamically adjust a base fuel pressure control signal. The resulting fuel pressure control can thus be characterized as open-loop with closed-loop correction based on air/fu

A fuel pressure control for an alternate-fuel engine utilizes adaptively learned corrections for fuel injection pulsewidth to dynamically adjust a base fuel pressure control signal. The resulting fuel pressure control can thus be characterized as open-loop with closed-loop correction based on air/fuel ratio error. The control dynamically adjusts the fuel pressure in a manner to optimize the air/fuel ratio control instead of controlling to a predetermined pressure, and fuel pressure measurement is not required.

대표청구항 ▼

1. A method of controlling a fuel pressure control mechanism in an alternate-fuel internal combustion engine where fuel is delivered to the engine for a duration that is scheduled to achieve a desired air/fuel ratio, the method comprising the steps of: retrieving a calibrated base fuel pressure c

1. A method of controlling a fuel pressure control mechanism in an alternate-fuel internal combustion engine where fuel is delivered to the engine for a duration that is scheduled to achieve a desired air/fuel ratio, the method comprising the steps of: retrieving a calibrated base fuel pressure control value based on measured engine operating conditions; dynamically adjusting said base fuel pressure control value based on a deviation of an actual air/fuel ratio from said desired air/fuel ratio to form a fuel pressure command; and controlling said fuel pressure control mechanism in accordance with said fuel pressure command. 2. The method of claim 1, including the steps of: forming and updating a table of adaptive fuel delivery corrections for different engine operating conditions based on an integral of said deviation; retrieving an adaptive fuel delivery correction from said table based on said measured engine operating conditions; and adjusting said base fuel pressure control value in accordance with said retrieved adaptive fuel delivery correction to form said fuel pressure command. 3. The method of claim 1, wherein said fuel pressure control mechanism is a fuel pump, and said fuel pressure command controls a speed of said fuel pump. 4. The method of claim 1, wherein said fuel pressure control mechanism is a fuel pressure regulator, and said fuel pressure command controls a regulating pressure of said fuel pressure regulator.