An air induction system for an engine is disclosed. The air induction system has a compressor operable to compress air directed into the engine, a bypass valve, and a throttle valve. The bypass valve may be disposed between the compressor and the engine and may have a valve element movable to select
An air induction system for an engine is disclosed. The air induction system has a compressor operable to compress air directed into the engine, a bypass valve, and a throttle valve. The bypass valve may be disposed between the compressor and the engine and may have a valve element movable to selectively divert a portion of the compressed air away from the engine in response to a desired air-to-fuel ratio of the engine. The throttle valve may be disposed between the bypass valve and the engine and may have a valve element movable to selectively restrict the flow of compressed air into the engine in response to a desired air-to-fuel ratio of the engine. The movements of the valve elements of the bypass and throttle valves may be substantially sequential.
대표청구항▼
What is claimed is: 1. A method of regulating the flow of intake air through an engine, the method comprising: operating a compressor to compress a flow of intake air; opening a first valve to selectively and independently divert an increasing portion of the compressed air away from the engine whil
What is claimed is: 1. A method of regulating the flow of intake air through an engine, the method comprising: operating a compressor to compress a flow of intake air; opening a first valve to selectively and independently divert an increasing portion of the compressed air away from the engine while the compressed air entering the engine is substantially unrestricted by a second valve; and operating the second valve to selectively and independently increase a restriction on the flow of compressed air into the engine while the first valve is held open at a maximum flow-passing position, wherein operating the first valve and opening the second valve are performed sequentially. 2. The method of claim 1, wherein the step of operating the second valve is initiated after the step of operating the first valve has been initiated. 3. The method of claim 1, wherein the step of operating the first valve is performed during a high load condition and the step of operating the second valve is performed during a low load condition. 4. The method of claim 3, wherein the low load condition includes a load less than about 25% of a rated load. 5. The method of claim 1, further including: sensing a characteristic of the compressed air; generating a signal indicative of the characteristic; and controlling at least one of the first and second valves in response to the signal. 6. The method of claim 1, wherein selectively diverting includes selectively diverting the portion of the compressed air from the compressor back into the compressor. 7. The method of claim 1, further including, after selectively and independently restricting the flow of compressed air, cooling the air flowing toward the engine. 8. An air induction system for an engine, comprising: a means for compressing air and directing the compressed air into the engine; a means for diverting a portion of the flow of compressed air away from the engine; and a means for restricting the flow of compressed air into the engine, wherein: during a first range of engine conditions, the means for diverting is moved to a maximum flow-diverting condition before the means for restricting is used to restrict the flow of compressed air into the engine; during a second range of engine conditions, the means for restricting is moved to a minimum flow-restricting before initiating a movement of the means for diverting toward a flow-blocking position; and only one of the means for diverting and means for restricting is moved at a time during operation in the first and second ranges of engine conditions. 9. The air induction system of claim 8, wherein the means for restricting is configured to regulate the flow of compressed air through the engine during a low load condition while the means for diverting is held in a flow-passing position. 10. The air induction system of claim 9, wherein the low load condition includes a load less than about 25% of a rated load. 11. The air induction system of claim 8, further including: a means for monitoring a characteristic of the compressed air and for generating a signal indicative of the characteristic; and a means for controlling the means for diverting and the means for restricting in response to the signal. 12. The air induction system of claim 8, wherein the means for diverting is further configured to selectively divert the portion of the compressed air from the means for compressing back into the means for compressing. 13. An air induction system for an engine, comprising: a compressor operable to compress air directed into the engine; a fluid conduit fluidly connecting at least the compressor and the engine; a bypass valve positioned to fluidly connect at least a point downstream of the compressor to a point upstream of the compressor, the bypass valve having a valve element independently movable to selectively divert a portion of the flow of compressed air away from the engine; and a throttle valve positioned on the fluid conduit, the throttle valve having a valve element independently movable to selectively restrict the flow of compressed air into the engine; and a controller in communication with the bypass valve and the throttle valve, the controller being configured to: during a first range of engine conditions, open the bypass valve to a maximum flow-passing position before initiating a closing movement of the throttle valve that increases a flow restriction through the throttle valve; and during a second range of engine conditions, open the throttle valve to a maximum flow-passing position before initiating a closing movement of the bypass valve that decreases flow through the bypass valve to the engine, wherein only one of the bypass and throttle valves is moved at a time during the first and second ranges of engine conditions. 14. The air induction system of claim 1, wherein the controller is configured to regulate the flow of compressed air through the engine during a low load condition by moving the throttle valve while the bypass valve is held in a flow-passing position. 15. The air induction system of claim 14, wherein the low load condition includes a load less than about 25% of a rated load. 16. The air induction system of claim 1, further including: a sensor configured to generate a signal indicative of a characteristic of the compressed air, wherein the controller is in communication with the sensor and at least one of the bypass and throttle valves is controlled in response to the signal. 17. The air induction system of claim 1, wherein the bypass valve is configured to selectively divert the portion of the compressed air from the compressor back into the compressor. 18. The air induction system of claim 1, further including an air cooler positioned between the throttle valve and the engine. 19. A power system, comprising: an engine configured to produce a power output; an air induction system configured to direct compressed air into the engine, the air induction system comprising: a compressor operable to compress the air directed into the engine; a bypass valve positioned to fluidly connect at least a point downstream of the compressor to a point upstream of the compressor, the bypass valve having a valve element independently movable to selectively divert a portion of the compressed air from the compressor back into the compressor; a throttle valve positioned on the fluid conduit, the throttle valve having a valve element independently movable to selectively restrict the flow of compressed air into the engine; and a controller in communication with the bypass valve and the throttle valve, the controller being configured to: during a first range of engine conditions, open the bypass valve to a maximum flow-passing position before initiating a closing movement of the throttle valve that increases a flow restriction through the throttle valve; and during a second range of engine conditions, open the throttle valve to a maximum flow-passing position before initiating a closing movement of the bypass valve that decreases flow through the bypass valve to the engine, wherein only one of the bypass and throttle valves is moved at a time during the first and second ranges of engine conditions. 20. The power system of claim 19, wherein: the controller is configured to regulate the flow of compressed air through the engine during a low load condition by moving the throttle valve while the bypass valve is held in a flow-passing position. 21. The power system of claim 20, wherein the low load condition includes a load less than about 25% of a rated load. 22. The power system of claim 21, wherein the air induction system further includes: a sensor configured to generate a signal indicative of a characteristic of the compressed air, wherein the controller is in communication with the sensor and at least one of the bypass and throttle valves is controlled in response to the signal.
Hofstetter,Matthias, Method and control device for controlling a turbocharger having a turbine-side charging pressure control and a circulating-air valve.
Cholvin Robert L. (Santa Monica CA) McInerney Charles E. (Rolling Hills Estates CA) Nancarrow James N. (Torrance CA) Gantz Jack L. (Marina Del Rey CA), Supercharged diesel engine air inflow control system.
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