Method of detecting start of combustion in diesel engines...

Details Method of detecting start of combustion in diesel engines... Method of detecting start of combustion in diesel engines...

2008-07-22

2008-07-22

McCall, Eric S (Department: 2855)

Measuring and testing

Vehicle chassis

Steering

Reexamination Certificate

active

07401504

ABSTRACT:
Disclosed herein is a method of estimating the start of combustion (SOC) in a diesel engine using a difference between an in-cylinder combustion pressure and a motoring pressure so as to effectively control the combustion in a combustion chamber. The method of the present invention features that it comprises the steps of: detecting a DP value defined as a difference pressure between an in-cylinder combustion pressure and a motoring pressure; detecting a crank angle (CADPxx) at a point where the detected DP value equals a specific pressure; defining an angle difference between the start of combustion (SOC) and the crank angle (CADPxx) as a detected delay angle (ΔCADD) and determining the detected delay angle (ΔCADD) through an experiment of measuring the start of combustion (SOC) and the crank angle (CADPxx); and detecting the SOC using the following Equation: SOC=CADPxx−ΔCADD, whereby the SOC can be estimated simply and accurately, and that the detected delay angle (ΔCADD) is defined as a simple function for the engine speed.

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Jennische, Mats: “Closed-Loop Control of Start of Combustion in a Homogeneous Charge Compression Ignition Engine”, Mar. 18, 2003, cover sheet and pp. 3-4.
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Glavmo, Magnus; Spadafora, Peter; Bosch, Russell: “Closed Loop Start of Combustion Control Utilizing Ionization Sensing in a Diesel Engine”SAE Technical Paper Series, 199-01-0549, Mar. 1999, cover page and pp. 1-3.
Lee, Kangyoon; Yoon, Maru; Sunwoo, Myoungho: “Detection and control of SOC for CRDI diesel engines”, Presentation 103, 20056105, pp. 1-3 (of 6) only.
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