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Crankshaft Position Measurement with Applications to Ignition Timing, Diagnostics and Performance Measurement
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Abstract
This paper introduces a high accuracy method of measuring crankshaft angular position of an I-C engine. The method uses a sensor which couples magnetically to the starter ring gear. There are many automotive applications of this measurement of crankshaft angular position including ignition timing reference, engine performance measurement and certain diagnostic functions. The present paper disusses only the ignition timing application. Engine performance measurements are reported in refs. (1,2,3). The diagnostic application is discussed in refs. (4-5).
The passage of a starter ring gear tooth past the sensor axis causes a pulse to be generated in the sensor output. The waveform of this sensor voltage is independent of engine angular speed (including zero speed). However, this waveform is a function of gear tooth profile and is consequently influenced by gear wear.
The present method uses a finite state machine to process the sensor output signal. This method is highly versatile and is readily adaptable to provide a signal having suitable format for timing reference for an arbitrary electronic ignition system. The method is particularly well suited for a distributorless ignition system.
Another benefit of the finite state machine signal processing is its ability to correct for sensor errors. Sensor errors can occur randomly due for example to electrical noise and, in extreme cases, to broken ring gear teeth. The error correcting feature makes this method highly fault tolerant and essentially insensitive to the condition of the ring gear.
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Authors
Citation
Dong, Y., Rizzoni, G., and Ribbens, W., "Crankshaft Position Measurement with Applications to Ignition Timing, Diagnostics and Performance Measurement," SAE Technical Paper 871914, 1987, https://doi.org/10.4271/871914.Also In
References
- Rizzoni G. “A Passenger Vehicle Onboard Computer System for IC Engine Fault Diagnosis, Performance Measurement and Control,” Proc. 37th IEEE Vehicular Technology Conference Tampa, Fi. June 1-3 1987 450 457
- Ribbens W. B. “A New Metric for Torque Nonuniformity,” SAE Intl. Congress & Exposition Cobo Hall, Detroit, Mich. Feb. 28 Mar. 4 1983 SAE 830425
- Henein N. “A Diagnostic Technique for the Identification of Misfiring Cylinders,” SAE Intl. Congress and Exposition Cobo Hall Detroit, Mich. 1987 SAE 870546
- Rizzoni G. “A Dynamic Model for the Internal Combustion Engine,” Department of Electrical Engineering and Computer Science, The University of Michigan Ann Arbor February 1986
- Ribbens W. B. Gross D. “Torque Nonuniformity Measurements in Gasoline Fueled Passenger Cars Equipped with automatic Transmission - Theory and Experimental Results,” SAE Intl. Congress and Exposition Cobo Hall Detroit, Mich. Feb. 24-28 1986 SAE 860114