Methods and systems are provided for managing a compressor temperature using EGR to address surge and condensation. A variable mixture of cooled compressor recirculation flow and hot EGR is provided to a compressor inlet. A composition of the mixture is adjusted to maintain a compressor inlet temper
Methods and systems are provided for managing a compressor temperature using EGR to address surge and condensation. A variable mixture of cooled compressor recirculation flow and hot EGR is provided to a compressor inlet. A composition of the mixture is adjusted to maintain a compressor inlet temperature sufficiently warm so as to reduce ingestion of condensation, and a compressor outlet temperature sufficiently cold to be within component temperature limits with flow above the surge limit.
대표청구항▼
1. A method of controlling a boosted engine, comprising: determining, via an electronic control unit, engine operating conditions including determining a required amount of compressor recirculation;adjusting one or more of a first valve in a compressor recirculation passage, and a second valve in an
1. A method of controlling a boosted engine, comprising: determining, via an electronic control unit, engine operating conditions including determining a required amount of compressor recirculation;adjusting one or more of a first valve in a compressor recirculation passage, and a second valve in an exhaust gas recirculation passage, to form a mixture of compressor recirculation flow from downstream of a charge air cooler with exhaust gas flow from the exhaust gas recirculation passage; anddelivering the mixture to a compressor inlet. 2. The method of claim 1, wherein the exhaust gas includes exhaust gas drawn from downstream of an exhaust manifold turbine, the exhaust gas flowing between the exhaust manifold and an exhaust gas recirculation (EGR) valve. 3. The method of claim 2, wherein the exhaust gas flowing between the exhaust manifold and the EGR valve includes the exhaust gas bypassing an EGR cooler and flowing unobstructed between the exhaust manifold and the EGR valve. 4. The method of claim 2, further comprising, estimating a compressor inlet temperature and adjusting a composition of the mixture based on the compressor inlet temperature. 5. The method of claim 4, wherein the adjusting includes, when EGR required to raise compressor inlet temperature does not exceed a combustion limit, decreasing an amount of compressor recirculation flow and increasing an amount of exhaust gas in the mixture as the compressor inlet temperature falls below a threshold, and when EGR required to raise compressor inlet temperature exceeds the combustion limit, disabling the addition of exhaust gas to the mixture while increasing the amount of compressor recirculation flow in the mixture as the compressor inlet temperature falls below the threshold. 6. The method of claim 5, wherein the threshold is based on one or more of ambient temperature, ambient humidity, and a water content of the mixture. 7. The method of claim 6, wherein decreasing an amount of compressor recirculation flow includes decreasing an opening of the first valve located in the compressor recirculation passage coupling an outlet of the charge air cooler to the compressor inlet, and wherein increasing an amount of exhaust gas includes increasing an opening of the second valve located in the exhaust gas recirculation passage coupling an outlet of the turbine to the compressor inlet. 8. The method of claim 7, wherein the compressor recirculation passage is coupled to the exhaust gas recirculation passage at a junction located downstream of each of the first and second valves and upstream of the compressor inlet. 9. The method of claim 1, further comprising adjusting a composition of the mixture based on a compressor outlet temperature and a combustion stability limit, the adjusting including one or more of increasing an amount of compressor recirculation flow and decreasing an amount of exhaust gas in the mixture as the compressor outlet temperature exceeds a threshold while a combustion stability limit is not exceeded. 10. The method of claim 1, further comprising adjusting a composition of the mixture based on an indication of compressor surge, the adjusting including increasing an amount of compressor recirculation flow and optionally decreasing an amount of exhaust gas in the mixture as the indication of surge exceeds a threshold. 11. A method for a boosted engine, comprising: estimating, via an electronic control unit, engine operating conditions based on air intake flow at at least one of a compressor inlet or a charge air cooler outlet indicating condensation and based on a compressor air intake flow indicating a surge condition;during a first condition, mixing compressor recirculation flow from downstream of a charge aft cooler with exhaust gas recirculation flow from an exhaust gas recirculation passage, flowing unobstructed from downstream of a turbine, in a first proportion responsive to a condensation threshold temperature; andduring a second condition, mixing the compressor recirculation flow with the exhaust gas recirculation in a second, different proportion responsive to surge,adjusting one or more of a first valve in a compressor recirculation passage, and a second valve in a exhaust gas recirculation passage to control the mixing of flow into the engine during the first and second conditions. 12. The method of claim 11, wherein during each of the first and second conditions, the mixture is delivered to a compressor inlet. 13. The method of claim 12, wherein the first proportion includes a higher amount of exhaust gas recirculation and a lower amount of compressor recirculation flow and wherein the second proportion includes a lower amount of exhaust gas recirculation and a higher amount of compressor recirculation flow. 14. The method of claim 13, wherein the exhaust gas recirculation flowing unobstructed includes low pressure exhaust gas recirculation in the mixture, flowing unobstructed from downstream of the turbine to the compressor inlet via an exhaust gas recirculation (EGR) valve without passing through an intercooler. 15. The method of claim 11, wherein the second condition includes a compressor ratio being outside a hard surge limit, and wherein the first condition includes a compressor inlet temperature being below a threshold, the threshold based on each of ambient humidity, ambient temperature, and a water content of the exhaust gas recirculation. 16. An engine system, comprising: an engine including an intake throttle;a turbocharger including a compressor driven by a turbine;a temperature sensor coupled to the compressor;a charge air cooler coupled downstream of the compressor;a first path including a first valve for recirculating compressed aircharge from downstream of the charge air cooler and upstream of the throttle to a compressor inlet;a second path including a second valve for recirculating exhaust gas from downstream of the turbine to the compressor inlet, the second path merging with the first path downstream of the second valve and upstream of the compressor inlet; anda controller with computer readable instructions stored on a non-transitory medium for: receiving one or more of a compressor inlet temperature and a compressor outlet temperature from the temperature sensor; andsending a control signal to adjust each of the first and second valve to provide a variable mixture of compressor recirculation flow and exhaust gas recirculation to the compressor inlet, a composition of the variable mixture adjusted based on one or more of the compressor inlet temperature and the compressor outlet temperature. 17. The system of claim 16, wherein the composition adjusted based on one or more of the compressor inlet temperature and the compressor outlet temperature includes adjusting the composition to maintain the compressor inlet temperature above a first threshold and/or maintain the compressor outlet temperature below a second threshold. 18. The system of claim 17, wherein adjusting each of the first and second valve to provide a variable mixture includes increasing an opening of the first valve while decreasing an opening of the second valve to reduce a temperature of the mixture and decreasing the opening of the first valve while increasing the opening of the second valve to increase the temperature of the mixture. 19. The system of claim 18, wherein the controller includes further instructions for adjusting the composition of the variable mixture based on an indication of surge, the adjusting including increasing the opening of the first valve while decreasing the opening of the second valve. 20. The system of claim 19, wherein the adjusting includes, responsive to the indication of surge, fully opening the first valve while fully closing the second valve, and wherein the adjusting responsive to the compressor inlet temperature includes fully closing the first valve while fully opening the second valve.
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