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Microprocessor Engine Controller
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English
Abstract
This paper describes a microprocessor engine controller designed for onboard control of closed-loop fuel injection, spark advance, and exhaust-gas recirculation. Developed through the preproduction prototype stage, the controller utilizes software subroutines to accomplish such operations as multiplication and interpolation. Ignition is controlled by means of time delays from relatively widely spaced crankshaft-position pulses. Emissions, driveability, fuel-economy, and hardware-cost comparisons are made between the microprocessor engine controller and a 1977 production analog electronic-fuel-injection controller with a mechanical-advance-controlled distributor. Directions for future development efforts are also described.
Citation
Hartford, T., "Microprocessor Engine Controller," SAE Technical Paper 780118, 1978, https://doi.org/10.4271/780118.Also In
References
- Bruijning H. G. Kleuters W. J. Poolman P. J. “Ignition and Electronic Injection Control for the Future,” Institution of Mechanical Engineers May 1973
- Camp J. Rachel T. L. “Closed-Loop Electronic Fuel and Air Control of Internal-Combustion Engines,” SAE Paper No. 750369 February 1975
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- Oswald R. S. Laurance N. L. Devlin S. S. “Design Consideration for an Onboard Computer System,” SAE Paper No. 750434 February 1975
- Russell J. B. Nedbal R. G. “Air/Fuel-Ratio Control Using A Single Microprocessor,” SAE Paper No. 770006 February 1977
- Barman A. W. Henrich R. S. “A Microprocessor Input/Output for Automotive Engine Control,” SAE International Automotive Engineering Congress and Exposition Detroit, Michigan 27 February 3 March 1978
- Gunda R. Rachel T. L. “Electronic Fuel Injection Utilizing Feedback Techniques,” IEEE Intercon Conference Record March 1974