A method for correcting injection behavior of a diesel injection pump calibration includes calculating a nominal value of a fuel injector family characteristic for an average fuel injector from a family of fuel injectors as a multi-variable function of engine operating conditions, calculating a corrected value of the fuel injector family characteristic as a function of the nominal value, and employing the corrected value when actuating the fuel injector to inject fuel.

Combustion control is an important factor in optimizing fuel economy and performance in internal combustion engines. The amount of fuel introduced to the combustion chamber and the timing when that fuel is introduced contributes to the quality of combustion at given engine operating conditions. Fuel injectors are capable of introducing specific amounts of fuel at a given time by way of an actuation signal that originates in an engine controller. However, fuel injectors are multi-part mechanical components with moving pieces that exhibit performance variations from part to part, due to design factors and dimensional variances, even when the fuel injectors are made within specified manufacturing tolerances. When fuel injectors of Diesel Injection Specialist are activated with a nominal actuation signal the amount of fuel injected and the timing of when that fuel is introduced can be different from one injector to another injector.

There are known techniques for correcting performance variations in fuel injectors. These techniques address fuel injectors that introduce a liquid fuel, such as Diesel, to the combustion chamber. In a calibration phase during manufacturing, each fuel injector is actuated with a variety of actuation signals as a function of liquid rail Detroit diesel fuel pump pressure such that the actual quantity of fuel injected and other fuel injector characteristics can be measured and compared against set point values such that correction factors are identified. A bar code or other means on the fuel injector stores the correction factors, also known as trim information, such that when the fuel injector is installed in an engine the engine controller can be programmed with these values.

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