Method of multiple injection timing control

Abstract

The invention relates to a method of multiple injection timing control. A method for adjusting fuel injection timing in an internal combustion engine including a cylinder and configured to operate multiple fuel injections in the cylinder per combustion cycle includes monitoring in-cylinder pressure through a first combustion cycle, determining actual combustion phasing metrics based upon the in-cylinder pressure, monitoring a baseline fuel injection timing comprising a first injection timing and a second injection timing, providing expected combustion phasing metrics based upon the baseline fuel injection timing, comparing the actual combustion phasing metrics to the expected combustion phasing metrics, and adjusting the baseline fuel injection timing in a second combustion cycle based upon the comparing.

Description

technical field [0001] The present invention relates to the operation and control of internal combustion engines. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Injection in different portions of the combustion cycle has different effects on the resulting combustion cycle, including effects on engine work output, emissions, and combustion stability. The fuel injection timing for each of the multiple fuel injections may be controlled, adjusted, or corrected, for example, by monitoring engine load and using calibration values ​​to determine the proper timing of each pulse in the multiple injection schedule. However, such methods are only as accurate as the calibration values ​​allow. Furthermore, it will be appreciated that such methods are reactive and include a time lag, controlling engine operation for a period of time after the measured input. ...

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However, such methods are only as accurate as the calibration values ​​allow

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