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Interlaboratory Correlation of Chassis Dynamometer Test Results
Technical Paper
852196
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Language:
English
Abstract
The testing of passenger car fuel consumption and exhaust emissions is carried out on chassis dynamometers of various makes and specifications. Correlation of results from different installations may be carried out at regular intervals using a specially prepared vehicle containing a stable engine (for exhaust emissions), torque transducers, a fuel flow meter and an electronic data acquisition system. However, basic problems, such as establishing a consistent relationship between wheel speed of the test vehicle and the surface speed of the idler roller have received little attention.
The present paper discusses these and other problems encountered in an interlaboratory correlation round involving more than 100 drive cycle tests in nine different chassis dynamometer laboratories throughout Australia. A method is presented of setting the tyre rolling circumference of the instrumented test car, which largely eliminates the wheel speed anomaly. In addition, a data analysis procedure, which separates absorbed power into components of friction, drag and inertia, has been used for diagnosing dynamometer and fuel consumption differences.
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Authors
- R. R. M. Johnston - Division of Energy Technology Commonwealth Scientific and Industrial Research Organization
- T. B. Crowle - Division of Energy Technology Commonwealth Scientific and Industrial Research Organization
- E. A. Christie - Division of Energy Technology Commonwealth Scientific and Industrial Research Organization
- D. Proctor - Division of Energy Technology Commonwealth Scientific and Industrial Research Organization
Citation
Johnston, R., Crowle, T., Christie, E., and Proctor, D., "Interlaboratory Correlation of Chassis Dynamometer Test Results," SAE Technical Paper 852196, 1985.Also In
References
- Rogers K.J. Johnston R.R.M. “Passenger Car Testing - Acceleration Measurement on Dynamometer and Road” International Journal of Vehicle Design 5 5 1984 585
- Crowle T.B. Johnston R.R.M. “Instrumentation and Data Processing used in a Passenger Car Fuel Consumption Study” IEA Conference on Measurement Instrumentation and Digital Technology Melbourne 1984
- Johnston R.R.M. Rogers K.J. Crowle T.B. “A New Method of Chassis Dynamometer Load Calibration Referred to Track” Japan Society of Automotive Engineers Spring Convention 1985 Tokyo 21-23 May 1985
- Method of test for petrol consumption of passenger cars and their derivatives Australian Standard AS2077-1982
- British Technical Council of the Motor and Petroleum Industries, Committee for Present and Future Fuel Requirements of Engines Inter Member Car Cross-check Project Results January 1978
- Krause N. Baronick J.D. “A. Study for the Selection of Dynamometers for Emission and Consumption Measurements” Volkswagen Research Report No. FMT 7907 V/5 September 1979
- Johnston R.R.M. Crowle T.B. “Inconsistencies in Setting Chassis Dynamometer Dissipative Loads with Particular Reference to the LA4 Cycle” To be presented 1985 SAE Passenger Car Meeting September 23-26 Dearborn, Michigan
- Technical Data Book - Petroleum Refining 11 English Amer. Petroleum Inst. 1964