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A Turbocharged Engine with Microprocessor Controlled Boost Pressure
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English
Abstract
A prototype boost pressure control system, utilizing a microprocessor to govern the wastegate settings, has been developed and tested on a turbocharged petrol engine with intercooler. The Volvo Computer Controlled Turbo (VCCT)-system allows optimum boost pressure settings for varied operating conditions.
A knock detecting system retards ignition and lowers boost simultanously, minimizing torque loss with no increase of exhaust gas temperature. For high performance turbo engines this strategy is important, since at continous high power operation no increase in thermal loading (with risk for degraded durability), can be accepted.
Vehicle tests show significant improvements in performance and fuel economy.
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Citation
Rydqvist, J., Sandberg, L., and Wallin, R., "A Turbocharged Engine with Microprocessor Controlled Boost Pressure," SAE Technical Paper 810060, 1981, https://doi.org/10.4271/810060.Also In
References
- “Volvo B21 Engine” Automotive Design Engineering November 1974 14 15
- Wallace T.F “BUICK's Turbocharged V6-Powertrain for 1978” Paper 780413 SAE Congress and Exposition Detroit-Michigan February 27 - march 3, 1978
- Gillbrand P. “Knock Detector System Controlling Turbocharger Boost Pressure” Paper 800833 SAE Passenger Car Meeting Dearborn June 9-13, 1980
- Glöcker O. Knapp H. Manger Hansjörg “Present Status and Future Development of Gasoline Fuel System for Passenger Cars” Paper 800467 SAE Congress and Exposition Detroit-Michigan February 25-29, 1980