SYSTEMS AND METHODS FOR REAL-TIME ANGLE-DOMAIN MEASUREMENT OF FILTERED CYLINDER PRESSURE

摘要

Techniques for measuring cylinder pressure include receiving an analog cylinder pressure signal indicative of pressure in a cylinder of an engine and an angular position signal indicative of an angular position of the engine. The analog cylinder pressure signal is converted to a digital cylinder pressure signal by (i) windowing the analog cylinder pressure signal in the angle-domain using the angular position signal and (ii) sampling the windowed analog cylinder pressure signal in the time-domain, and the digital cylinder pressure signal is filtered in the time-domain to obtain a filtered digital cylinder pressure signal. A measured pressure in the angle domain is obtained by sampling the filtered digital cylinder pressure signal using the angular position signal, and operation of the engine is controlled using the measured cylinder pressure.

主权项

1. A cylinder pressure measurement system, comprising:
a first analog cylinder pressure sensor configured to generate a first analog cylinder pressure signal indicative of pressure in a first cylinder of an engine; an engine position sensor configured to generate an angular position signal indicative of an angular position of the engine; and a controller configured to:
receive the first analog cylinder pressure signal and the angular position signal;convert the first analog cylinder pressure signal to obtain a first digital cylinder pressure signal by (i) windowing the first analog cylinder pressure signal in the angle-domain using the angular position signal and (ii) sampling the windowed first analog cylinder pressure signal in the time-domain;filter the digital cylinder pressure signal in the time-domain to obtain a first filtered digital cylinder pressure signal;obtain a measured pressure in the first cylinder of the engine in the angle domain by sampling the first filtered digital cylinder pressure signal using the angular position signal; andcontrol operation of the engine using the measured cylinder pressure in the first cylinder of the engine.