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A Turbocharged Engine with Microprocessor Controlled Boost Pressure

1981; Linguagem: Inglês

10.4271/810060

2688-3627

J. E. Rydqvist, Lori Sandberg, R. Wallin,

Refrigeration and Air Conditioning Technologies

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 Trubo (VCCT)-system allows optimum boost pressure settings for varied operating conditions. A knock detecting system retards ignition and lowers boost simultaneously, minimizing torque loss with no increase of exhaust gas temperature. For high performance turbo engines this strategy is important, since at continuous 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.