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US 11,920,509 B2Granted
Bypass system for engine startup
AssigneeCummins Inc.
InventorsRick Vaughan Lewis, Jr., Yilun Liu, Jingxuan Liu, Trideep Singh, Carlos Alcides Lana, Stephen Cox
Life of this patent
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Abstract
Systems, methods and apparatus are disclosed for providing reduced engine start times for a fumigation type internal combustion engine. A bypass is provided that directly connects the air-fuel mixer upstream of the compressor to the intake manifold, providing the air-fuel mixture to the intake manifold during engine startup.
Claims20
A method, comprising:
- starting an internal combustion engine including an intake system and an air-fuel mixer connected to an intake manifold with first and second flow paths;
- while starting the internal combustion engine, directing an air-fuel mixture from the air-fuel mixer directly to the intake manifold through the second flow path to bypass a compressor and an intake throttle in the first flow path, and positioning the intake throttle in a closed position;
- and
- transitioning providing the air-fuel mixture to the intake manifold from the second flow path to the first flow path after the engine is started.
1 more element
An apparatus, comprising:
- an electronic controller configured to determine a compressor bypass valve command that controls a compressor bypass valve actuator to position a bypass valve in a compressor bypass flow path of an internal combustion engine, wherein the electronic controller is further configured to determine an intake throttle command that controls an intake throttle actuator to position an intake throttle in a compressor flow path of the internal combustion engine that includes a compressor;
- and
- wherein, in response to an engine startup condition, the compressor bypass valve actuator is operable to position the compressor bypass valve in response to the compressor bypass valve command, and the intake throttle actuator is operable to close the intake throttle in response to the intake throttle command, to direct an air-fuel mixture from an air-fuel mixer directly to the intake manifold through the compressor bypass flow path while closing the compressor flow path to bypass the compressor and the intake throttle in the compressor flow path.
A system, comprising:
- an internal combustion engine including an intake system with an air-fuel mixer, the air fuel mixer connected to an intake manifold of the internal combustion engine by compressor flow path that includes a compressor and an intake throttle, the intake system further including a compressor bypass flow path that includes a bypass valve and connects the air-fuel mixer with the intake manifold, wherein the compressor bypass flow path bypasses the compressor and the intake throttle;
- and
- an electronic controller configured to control the bypass valve and the intake throttle and, in response to an engine startup condition, the controller is configured to open the compressor bypass valve and close the intake throttle to direct an air-fuel mixture from the air-fuel mixer directly to the intake manifold through the compressor bypass flow path.
Dependencies are inferred from the claim text.