초록 ▼

A strategy for quantifying and compensating for between-engine variations in engine static timing, fuel pump phasing and overall system bandwidth includes a control circuit operable to manage a fuel control system including a high pressure, cyclically operable fuel pump and at least one fuel injecto

A strategy for quantifying and compensating for between-engine variations in engine static timing, fuel pump phasing and overall system bandwidth includes a control circuit operable to manage a fuel control system including a high pressure, cyclically operable fuel pump and at least one fuel injector operable to supply fuel to an internal combustion engine from a fuel collection unit. In one embodiment, the strategy of the present invention is operable to determine peak values of the fuel pressure within fuel collection unit and corresponding engine position values for a number of different engine speeds and solve a corresponding model-based system of equations to determine a combined engine static timing and fuel pump phasing error as well as a first overall system bandwidth value. In another embodiment, the strategy of the present invention is operable to determine peak values of the pressure within a combustion chamber of the engine along with associated engine position values for a number of different engine speeds and solve for the engine static timing error alone and/or a second overall system bandwidth value. In yet another embodiment, the two foregoing strategies may be combined to produce separately the first and second bandwidth values as well as the individual engine static timing and fuel pump phasing error values. In any case, the computed error and bandwidth values may be used to improve the accuracy of sampled engine and/or fuel control system parameters as they relate to engine position.

대표청구항 ▼

1. Apparatus for determining errors in monitored operating parameters of a fuel system for an internal combustion engine, comprising:means for sensing a pressure associated with a fuel system of an internal combustion engine and producing a pressure signal corresponding thereto, said pressure signal

1. Apparatus for determining errors in monitored operating parameters of a fuel system for an internal combustion engine, comprising:means for sensing a pressure associated with a fuel system of an internal combustion engine and producing a pressure signal corresponding thereto, said pressure signal having peak values corresponding to peak pressure values thereof; means for determining a reference position of said internal combustion engine and producing a reference position signal corresponding thereto; means for determining first and second engine positions at which peak values of said pressure signal occur for at least first and second engine speeds; and means for determining a first operating parameter error value as a function of said first and second engine positions relative to said reference engine position.