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A Servo Vehicle Driver for EPA Emission Tests
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English
Abstract
An electronic servo controller, combined with an electric chassis dynamometer and a synchronized mini-computer generated command signal, provides consistent and smooth driving of development vehicles on EPA emission runs. The electronic controller provides the necessary signals to actuate the throttle servo to power the engine, and to generate braking torque on the chassis rolls of the electric dynamometer. The servo gain and compensation circuits allow accurate and stable operation over a wide range of engine loads, transmission gear ratios, and car speeds. A single gain-compensation network is sufficient for vehicles used in AC's catalytic converter development program. Safety shutdown circuits and ease of installation are provided in the design.
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Citation
Levijoki, A., Ayres, J., Yu, R., and Hammel, M., "A Servo Vehicle Driver for EPA Emission Tests," SAE Technical Paper 730532, 1973, https://doi.org/10.4271/730532.Also In
References
- Brainard N. R. Brown A. E. “A Laboratory for 1975-76 Vehicle Emission Testing.” Paper 730531 SAE National Automobile Engineering Meeting Detroit May 1973
- Moore M. L. “Assurance and Control of Vehicle Emission Testing.” Paper 730534 SAE National Automobile Engineering Meeting Detroit May 1973
- “Exhaust Emission Standards and Test Procedures.” Federal Register, Part II 36 128 July 1971
- Thaler G. J. Brown R. G. “Analysis & Design of Feedback Control Systems.” New York McGraw-Hill 1960
- Holl W. H. “Variables for Emission Test Data Analysis.” Paper 730533 SAE National Automobile Engineering Meeting Detroit May 1973