SYSTEM FOR CONTROLLING AN AIR HANDLING SYSTEM INCLUDING A DUAL-STAGE VARIABLE GEOMETRY TURBOCHARGER
First Claim
1. An air handling system for an internal combustion engine, comprising:
- a dual stage turbocharger including a high-pressure turbine having an exhaust gas inlet fluidly coupled to an exhaust manifold of the engine and an exhaust gas outlet, and a low-pressure turbine having an exhaust gas inlet fluidly coupled to the exhaust gas outlet of the high-pressure turbine and an exhaust gas outlet fluidly coupled to ambient,a turbine bypass passageway having one end fluidly coupled to the exhaust gas inlet of the high-pressure turbine and an opposite end fluidly coupled to the exhaust gas outlet of the high-pressure turbine,a turbine bypass throttle disposed in-line with the turbine bypass passageway, the turbine bypass throttle controllable between fully closed and fully open positions to control a flow of exhaust gas through the turbine bypass passageway, anda control circuit including a memory having instructions stored therein that are executable by the control circuit to determine a turbine bypass control signal as a function of a target flow rate of exhaust gas through the turbine bypass throttle, a target temperature of the exhaust manifold and a target outlet temperature of the high pressure turbine, and to control a position of the turbine bypass throttle between the fully closed and fully open positions using the turbine bypass control signal to selectively divert exhaust gas flow from the exhaust manifold away from the exhaust gas inlet of the high-pressure turbine.
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Accused Products
Abstract
A system is provided for controlling an air handling system for an internal combustion engine. A dual-stage turbocharger includes a high-pressure compressor and variable geometry turbine combination fluidly coupled to a low-pressure compressor and variable geometry turbine combination. A control circuit includes a memory having instructions stored therein that are executable by the control circuit to determine a target low-pressure compressor ratio, a target high-pressure compressor ratio, a target high-pressure compressor inlet temperature and a target high-pressure compressor inlet pressure as a function of a target outlet pressure of the high-pressure compressor and a temperature, a pressure and a target flow rate of air entering the air inlet of the low-pressure compressor, and to control the geometries of the low-pressure and high-pressure turbines as a function of the target low-pressure compressor ratio the target high-pressure compressor ratio respectively.
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Citations
20 Claims
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1. An air handling system for an internal combustion engine, comprising:
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a dual stage turbocharger including a high-pressure turbine having an exhaust gas inlet fluidly coupled to an exhaust manifold of the engine and an exhaust gas outlet, and a low-pressure turbine having an exhaust gas inlet fluidly coupled to the exhaust gas outlet of the high-pressure turbine and an exhaust gas outlet fluidly coupled to ambient, a turbine bypass passageway having one end fluidly coupled to the exhaust gas inlet of the high-pressure turbine and an opposite end fluidly coupled to the exhaust gas outlet of the high-pressure turbine, a turbine bypass throttle disposed in-line with the turbine bypass passageway, the turbine bypass throttle controllable between fully closed and fully open positions to control a flow of exhaust gas through the turbine bypass passageway, and a control circuit including a memory having instructions stored therein that are executable by the control circuit to determine a turbine bypass control signal as a function of a target flow rate of exhaust gas through the turbine bypass throttle, a target temperature of the exhaust manifold and a target outlet temperature of the high pressure turbine, and to control a position of the turbine bypass throttle between the fully closed and fully open positions using the turbine bypass control signal to selectively divert exhaust gas flow from the exhaust manifold away from the exhaust gas inlet of the high-pressure turbine. - View Dependent Claims (2, 3, 4, 5)
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6. An air handling system for an internal combustion engine, comprising:
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a dual stage turbocharger including a low-pressure compressor rotatably coupled to a low-pressure variable geometry turbine, the low-pressure compressor having an air inlet fluidly coupled to ambient and an air outlet, and a high-pressure compressor rotatably coupled to a high-pressure variable geometry turbine, the high-pressure compressor having an air inlet fluidly coupled to the air outlet of the low-pressure compressor and an air outlet fluidly coupled to an intake manifold of the engine, a low-pressure turbine actuator responsive to a low-pressure variable geometry turbine control signal to control a geometry of the low-pressure variable geometry turbine, a high-pressure turbine actuator responsive to a high-pressure variable geometry turbine control signal to control a geometry of the high-pressure variable geometry turbine, and a control circuit including a memory having instructions stored therein that are executable by the control circuit to determine a target low-pressure compressor ratio, a target high-pressure compressor ratio, a target high-pressure compressor inlet temperature and a target high-pressure compressor inlet pressure as a function of a target outlet pressure of the high-pressure compressor and a temperature, a pressure and a target flow rate of air entering the air inlet of the low-pressure compressor, to produce the low-pressure variable geometry turbine control signal as a function of the target low-pressure compressor ratio and to produce the high-pressure variable geometry control signal as a function of the target high-pressure compressor ratio, the target high-pressure compressor inlet temperature and a target high-pressure compressor inlet pressure. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification