Importance

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Abstract

An exhaust gas control system for controlling the flow of exhaust gases from an internal combustion engine to the turbine of a turbocharger can provide efficient engine operation over a full range of engine speeds and can be used to provide vehicle braking and reduced engine warm-up time. Such a system includes a combination valve upstream of a turbocharger turbine including diverter and restrictor sections, each section having a neutral position, the diverter and restrictor sections being independently operable from their neutral positions for concentrating the flow of exhaust gas to the turbine and for blocking the flow of exhaust gas to the turbine. Such systems can further include an ambient air temperature sensor for operating the diverter section and restrictor section in response to ambient air temperatures below a predetermined temperature for blocking the flow of exhaust gas to said turbocharger turbine for reduced warm-up times, a vehicle operator's switch for operating the diverter section and restrictor section for blocking the flow of exhaust gas to the turbocharger engine for vehicle braking, and an engine speed sensor for operating the diverter section in response to engine speeds below a predetermined speed for concentrating the flow of exhaust gas into the turbocharger turbine, for example, by directing exhaust gas from one passageway of a two passageway flow path to the other passageway.

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First Claim