Cummins Emission Solutions Inc.

Holset Engineering Company, Limited

Stephen W Caddy

Randolph G Zoran

Stephen M Holl

Colin L Norris

Jamie Archer

John M Clark

Matthew Robert Brookes

Matthew Henry

An exhaust gas system includes: an engine-turbine exhaust gas conduit configured to receive exhaust gas from an engine; a turbocharger including a turbine coupled to the engine-turbine exhaust gas conduit; an injection housing coupled to the turbine and centered on an injection housing axis; a dosing module coupled to the injection housing and including an injector configured to dose reductant into the injection housing, the injector centered on an injector axis; and a bypass system including: a bypass inlet conduit coupled to the engine-turbine exhaust gas conduit, a bypass valve coupled to the bypass inlet conduit, and a bypass outlet conduit coupled to the bypass valve, the bypass outlet conduit centered on a bypass outlet conduit axis.

Exhaust gas aftertreatment system

An exhaust gas system includes an engine-turbine exhaust gas conduit, a turbocharger, a turbine-housing exhaust gas conduit, an injection housing, a dosing module, and a bypass system. The engine-turbine exhaust gas conduit is configured to receive exhaust gas. The turbocharger includes a turbine. The turbine is coupled to the engine-turbine exhaust gas conduit. The turbine-housing exhaust gas conduit is coupled to the turbine. The injection housing is coupled to the turbine-housing exhaust gas conduit and centered on an injection housing axis. The dosing module is coupled to the injection housing and includes an injector. The injector is configured to dose reductant into the injection housing. The injector is centered on an injector axis. The bypass system includes a bypass inlet conduit, a bypass valve, and a bypass outlet conduit. The bypass inlet conduit is coupled to the engine-turbine exhaust gas conduit.

A control system for a variable geometry turbocharger having a turbine driven by exhaust gas delivered to an exhaust gas inlet of the turbocharger from an engine exhaust manifold and a compressor driven by the turbine to deliver air to an engine intake manifold via an air outlet of the turbocharger. The differential pressure across the engine is monitored, and a closed loop control system adjusts the variable geometry mechanism to prevent the differential pressure exceeding a predetermined limit. In engine braking mode the variable geometry mechanism may be actuated by a signal representative of the exhaust manifold pressure. An override circuit may be provided to control the variable geometry mechanism in the event of the turbocharger rpm exceeding a predetermined limit.

Variable geometry turbocharger control system

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Huddersfield, United Kingdom

Stephen W Caddy