In recent years considerable interest has been placed on the detection of engine misfire. As part of the California Air Resources Board on-board diagnostics regulations for 1994 model year vehicles , misfire should be monitored continuously by the engine diagnostic system. It is expected that the next generation of on-board diagnostics regulations will demand monitoring of partial misfire as well. This paper describes the application of a misfire detection method based on a measurement of crankshaft angular velocity to a high-performance automotive engine. The work described here confirms the potential of this misfire detection method in a particularly challenging application. The development of the misfire detection algorithm considered here starts from the method originally proposed and by Ribbens and Rizzoni ([2, 3, 4, 5 and 6], [9, 10, 11, 12 and 13], [15-16]), and also studied and improved upon by others ([7,8,14,19], for example). This paper illustrates the application of the method through appropriate signal processing techniques to a 12-cylinder high-performance engine (5.7-liter Lamborghini Diablo VT engine). It has been suggested [17, 18] that a measurement of engine angular velocity is in itself not sufficient to detect misfire in engines with many cylinders, and at high engine speed. On the contrary, we show in this paper that with suitable signal processing it is possible to successfully apply this method to a very high performance V-12 engine. It should be noted that in a 12-cylinder engine it may be very difficult to identify even two continuously misfiring cylinders even for an experienced test driver. Thus, the importance of this particular application for the engine manufacturer goes beyond meeting the CARB and EPA requirements. This paper summarizes the signal processing algorithms and the experimental work performed by the authors to carry out an initial validation of the method on an engine connected to an eddy-current brake. In this first phase of the research the experimental tests were carried out considering one or few misfires in a cycle. Work is currently in progress to perform chassis dynamometer and road tests. The work reported in this paper is still in the research stages. Further work must be done before it can be implemented in a production unit. © Copyright 1995 Society of Automotive Engineers, Inc.
All Science Journal Classification (ASJC) codes
- Automotive Engineering
- Safety, Risk, Reliability and Quality
- Industrial and Manufacturing Engineering
Azzoni, P., Cantoni, G., Minelli, G., Moro, D., Rizzoni, G., Ceccarani, M., & Mazzetti, S. (1995). Measurement of engine misfire in the lamborghini 533 V-12 engine using crankshaft speed fluctuations. SAE Technical Papers, -. https://doi.org/10.4271/950837