Variable geometry turbocharger control system
AssigneeHolset Engineering Company Limited
InventorStephen W. Caddy
Life of this patent
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Abstract
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.
Claims8
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, comprising sensor means for monitoring an engine operating parameter including at least a function of the pressure within the engine exhaust manifold, and closed loop control means receiving the output of said sensor means for controlling the displacement of a variable geometry mechanism located upstream of the turbine to maintain the monitored parameter within predetermined limits, wherein said monitored parameter is at least a function of the difference between the pressures within the engine exhaust manifold and the engine intake manifold.
Dependencies are inferred from the claim text.