US 7,069,138 B2 · Method for the drift compensation of an injector for the direct fuel injection in a cylinder of an internal combustion engine as well as a device

Abstract

In the case of direct injection internal combustion engines, the problem occurs that especially the injection of a minimum amount of fuel depends in particular on different operating parameters such as the speed, the start of the injection or the rail pressure. Therefore, a method or a device is suggested in which a control unit (10) subdivides the complete range of values of at least one operating parameter into discrete sections. Subsequently, for each section, at least one operating point is specified for which a corresponding correction value depending on the operating parameter is determined and obtained. The correction value is then stored together with its corresponding operating point. This has the advantage that the correction value can be determined more accurately because interpolation can for example also be performed between two operating points.

Claims17

Dependent claims

A method for drift compensation of an injector for direct fuel injection into a cylinder of an internal combustion engine, comprising the steps of:

for injecting a defined amount of fuel, determining and learning a correction value by a control unit, the correction value operable to compensate for drift of the injector that applies to one value range of at least one operating parameter of the internal combustion engine, and
subdividing the value range of the at least one operating parameter into at least two discrete sections such that for at least one section and at least one operating point a correction value is determined and obtained depending on the at least one operating parameter,
determining a new correction value for the running adaptation of the at least one section and testing the new correction value for validity by comparing the new correction value with the current average value of all the correction values previously learned in the at least one section.

Dependencies are inferred from the claim text.

Method for the drift compensation of an injector for the direct fuel injection in a cylinder of an internal combustion engine as well as a device

Life of this patent

Method for the drift compensation of an injector for the direct fuel injection in a cylinder of an internal combustion engine as well as a device

Life of this patent

Abstract

Claims17