Systems and methods for a split exhaust engine system
First Claim
1. A method, comprising:
- adjusting a timing of a first set of cylinder exhaust valves to adjust a flow of exhaust from engine cylinders to an intake passage, upstream of a compressor, via an exhaust gas recirculation (EGR) passage, where the first set of cylinder exhaust valves open at a different time than a second set of cylinder exhaust valves coupled to an exhaust passage, wherein the adjusting the timing of the first set of cylinder exhaust valves is responsive to a condition of the compressor including one or more of condensate formation at the compressor, a compressor inlet temperature less than a lower threshold temperature, a compressor outlet temperature greater than an upper threshold temperature, and a compressor speed greater than a threshold speed.
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Abstract
Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation to an intake passage via a first exhaust manifold and exhaust gas to an exhaust passage via a second exhaust manifold. In one example, a flow of exhaust (e.g., exhaust gas recirculation) from engine cylinders to the intake passage, upstream of a compressor, via an exhaust gas recirculation (EGR) passage and the first exhaust manifold may be adjusted by adjusting a timing of a first set of cylinder exhaust valves coupled to the first exhaust manifold. Additionally, the first set of cylinder exhaust valves open at a different time than a second set of cylinder exhaust valves coupled to the exhaust passage.
112 Citations
19 Claims
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1. A method, comprising:
adjusting a timing of a first set of cylinder exhaust valves to adjust a flow of exhaust from engine cylinders to an intake passage, upstream of a compressor, via an exhaust gas recirculation (EGR) passage, where the first set of cylinder exhaust valves open at a different time than a second set of cylinder exhaust valves coupled to an exhaust passage, wherein the adjusting the timing of the first set of cylinder exhaust valves is responsive to a condition of the compressor including one or more of condensate formation at the compressor, a compressor inlet temperature less than a lower threshold temperature, a compressor outlet temperature greater than an upper threshold temperature, and a compressor speed greater than a threshold speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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during a first mode, adjusting a flow of exhaust gas from a first set of cylinder exhaust valves to an intake passage, upstream of a compressor, via adjusting each of a position of an exhaust gas recirculation (EGR) valve disposed in an EGR passage and a timing of the first set of cylinder exhaust valves; during a second mode, adjusting the flow of exhaust gas via adjusting only the position of the EGR valve and not the timing of the first set of cylinder exhaust valves; and during a third mode, adjusting the flow of exhaust gas via adjusting only the timing of the first set of cylinder exhaust valves and not the position of the EGR valve. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system, comprising:
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a first set of cylinder exhaust valves coupled exclusively to a first exhaust manifold; a second set of cylinder exhaust valves coupled exclusively to a second exhaust manifold; an exhaust passage coupled to the second exhaust manifold and including a turbine; an exhaust gas recirculation (EGR) passage including an EGR valve and coupled between an intake passage, upstream of a compressor, and the first exhaust manifold; and a controller including memory with instructions stored thereon for; adjusting a timing of the first set of cylinder exhaust valves in response to a request to adjust a flow of EGR from the first exhaust manifold to the intake passage via the EGR passage, where adjusting timing of the first set of cylinder exhaust valves includes adjusting the first set of cylinder exhaust valves responsive to condensate formation at the compressor. - View Dependent Claims (18, 19)
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Specification