Wastegate control to reduce charge air cooler condensate
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-023/00
F02B-033/44
F02B-037/18
F02D-041/00
F02B-037/16
출원번호
US-0886086
(2013-05-02)
등록번호
US-9181859
(2015-11-10)
발명자
/ 주소
Glugla, Chris Paul
Yamada, Shuya Shark
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Voutyras, Julia
인용정보
피인용 횟수 :
2인용 특허 :
6
초록▼
Methods and systems are provided for adjusting a wastegate in response to condensate forming conditions in a charge air cooler (CAC). In one example, a wastegate may be opened in response to an induction pressure greater than a threshold pressure when the induction pressure is greater than required
Methods and systems are provided for adjusting a wastegate in response to condensate forming conditions in a charge air cooler (CAC). In one example, a wastegate may be opened in response to an induction pressure greater than a threshold pressure when the induction pressure is greater than required to produce a manifold pressure required for a torque demand. Further, a compressor recirculation valve may be opened to further reduce the induction pressure during certain driving conditions.
대표청구항▼
1. A method of reducing charge air cooler condensate in an engine system comprising: while operating the engine, adjusting a wastegate in a bypass around a turbine arranged in an engine exhaust passage in response to condensate forming conditions in a charge air cooler when an induction pressure of
1. A method of reducing charge air cooler condensate in an engine system comprising: while operating the engine, adjusting a wastegate in a bypass around a turbine arranged in an engine exhaust passage in response to condensate forming conditions in a charge air cooler when an induction pressure of air measured upstream of a throttle and downstream of the charge air cooler in an engine intake passage is greater than a requested level, the requested level based on an engine torque demand. 2. The method of claim 1, further comprising opening the wastegate in response to the condensate forming conditions when the induction pressure is greater than the requested level and the engine is at steady-state conditions, where steady-state conditions include at least one of when the engine torque demand is not increasing and when the engine is operating at a relatively constant pedal position that is greater than zero and that maintains a vehicle speed within a threshold speed of an average speed, and wherein the requested level is based on an amount of charge air required to produce the engine torque demand and an engine intake manifold pressure required to produce the amount of charge air. 3. The method of claim 2, wherein steady-state conditions include at least one of a cruise control operation and a constant pedal position and wherein the throttle and charge air cooler are arranged in the engine intake passage, upstream of engine cylinders of the engine. 4. The method of claim 2, wherein the condensate forming conditions include at least one of the induction pressure being greater than atmospheric pressure and a humidity greater than a first threshold. 5. The method of claim 4, further comprising opening a compressor recirculation valve arranged in a bypass around a compressor disposed in the engine intake passage, where the compressor is at least partially driven by the turbine, in addition to opening the wastegate, in response to at least one of the induction pressure being greater than a threshold pressure, the threshold pressure a threshold amount greater than atmospheric pressure, the humidity being greater than a second threshold, the second threshold greater than the first threshold, and a compressor surge condition. 6. The method of claim 2, further comprising closing the wastegate in response to at least one of the induction pressure decreasing to or below atmospheric pressure and an increase in torque demand. 7. The method of claim 1, further comprising closing the wastegate and opening a compressor recirculation valve arranged in a bypass around a compressor disposed in the engine intake passage, where the compressor is at least partially driven by the turbine, in response to the condensate forming conditions when the induction pressure is greater than the requested level and the engine is not at steady-state conditions. 8. The method of claim 1, further comprising closing the wastegate in response to the condensate forming conditions when the induction pressure is not greater than the requested level and wherein the requested level is an engine intake manifold pressure that produces an amount of charge air that produces the engine torque demand. 9. A method of reducing charge air cooler condensate in an engine system, comprising: during operation of the engine: in response to an induction pressure measured between a charge air cooler and intake throttle in an engine intake passage greater than a first threshold pressure, during driving conditions when the induction pressure is greater than a requested level, the requested level based on a torque demands and the engine is at steady-state where the torque demand is not increasing, opening a wastegate in a bypass around a turbine in an engine exhaust passage to decrease the induction pressure. 10. The method of claim 9, further comprising opening the wastegate in response to a humidity greater than a first threshold, during driving conditions when the induction pressure is greater than the requested level and the engine is at steady-state. 11. The method of claim 10, further comprising opening a compressor recirculation valve arranged in a bypass around a compressor disposed in the engine intake passage, where the compressor is at least partially driven by the turbine, in response to at least one of the induction pressure being greater than a second threshold pressure, the second threshold pressure being greater than the first threshold pressure, the humidity being greater than a second threshold, the second threshold being greater than the first threshold, and a compressor surge condition. 12. The method of claim 11, further comprising closing the wastegate responsive to at least one of the torque demand increasing and the induction pressure decreasing to or below the first threshold pressure and then closing the compressor recirculation valve responsive to at least one of the requested level of the induction pressure being greater than the induction pressure and the induction pressure decreasing to or below the second threshold pressure. 13. The method of claim 9, further comprising, after the opening the wastegate to decrease the induction pressure, closing the wastegate responsive to at least one of the induction pressure decreasing to or below the first threshold pressure and an increase in torque demand. 14. The method of claim 9, further comprising opening a compressor recirculation valve arranged in a bypass around a compressor disposed in the engine intake passage, where the compressor is at least partially driven by the turbine, and closing the wastegate when the engine is not at steady-state and the torque demand is increasing. 15. The method of claim 9, wherein the first threshold pressure is based on a pressure at which condensate forms in the charge air cooler. 16. The method of claim 15, wherein the first threshold pressure is atmospheric pressure. 17. A method of reducing charge air cooler condensate in an engine system, comprising: during a first condition of an engine, opening a wastegate arranged in a bypass around a turbocharger turbine disposed in an engine exhaust passage and maintaining a position of a compressor recirculation valve arranged in a bypass around a turbocharger compressor disposed in an engine intake passage upstream of a charge air cooler in response to at least one of an induction pressure measured between the charge air cooler and an intake throttle in the engine intake passage being greater than a first threshold pressure and a humidity upstream of the charge air cooler greater than a threshold; and during a second condition of the engine, opening the compressor recirculation valve and closing the wastegate in response to at least one of the induction pressure being greater than the first threshold pressure and the humidity greater than the threshold. 18. The method of claim 17, wherein the first condition includes when the induction pressure is greater than a requested level, the requested level required-based on a torque demand, and the engine is at steady-state, where steady-state includes at least one of when the engine torque demand is not increasing and when the engine is operating at a relatively constant pedal position that is greater than zero and that maintains a vehicle speed within a threshold speed of an average speed. 19. The method of claim 18, further comprising opening the compressor recirculation valve in response to at least one of a compressor surge condition and the induction pressure being greater than a second threshold pressure, the second threshold pressure being greater than the first threshold pressure. 20. The method of claim 17, wherein the second condition includes when the induction pressure is greater than a requested level, the requested level based on a torque demand and the engine is not at steady-state.
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