Method for controlling a variable charge air cooler
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-029/04
F02B-033/44
F02M-025/07
F02D-023/00
출원번호
US-0590072
(2012-08-20)
등록번호
US-9169809
(2015-10-27)
발명자
/ 주소
Buckland, Julia Helen
Glugla, Chris Paul
Wade, Robert Andrew
Devries, Jason Eugene
Cockerill, Charles A.
McConville, Gregory Patrick
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Voutyras, Julia
인용정보
피인용 횟수 :
0인용 특허 :
17
초록
Embodiments for a charge air cooler are provided. In one example, an engine method comprises during a first mode, decreasing a volume of a charge air cooler in response to a compressor operation upstream of the charge air cooler. In this way, compressor surge may be prevented.
대표청구항▼
1. A method of operating a turbocharged engine having an electronic control unit including non-transitory instructions stored in memory, the method comprising: determining operating conditions of a compressor indicating whether the compressor is in a surge region or in a non-surge region;decreasing
1. A method of operating a turbocharged engine having an electronic control unit including non-transitory instructions stored in memory, the method comprising: determining operating conditions of a compressor indicating whether the compressor is in a surge region or in a non-surge region;decreasing a volume of a charge air flow by adjusting an actuator of a charge air cooler valve to decrease a number of passages through which the charge air flows within the charge air cooler, disposed downstream of the compressor, in response to the operating conditions of the compressor. 2. The method of claim 1, wherein the determining operating conditions of the compressor comprises at least one of: determining a current compressor operation in the surge region based on pressure ratio across the compressor and mass air flow rate through the compressor andpredicting a compressor operation in the surge region upon transitioning from one operating condition of the engine to a next operating condition of the engine, based on the current pressure ratio across the compressor and mass air flow rate through the compressor and the next operating condition of the engine. 3. The method of claim 2, wherein said at least one of the determining the current compressor operation and the predicting the compressor operation being in the surge region is based on engine speed and load. 4. The method of claim 2, wherein said at least one of the determining the current compressor operation and the predicting the compressor operation being in the surge region is based on mass air flow rate through the compressor and a level of provided boost pressure of the compressor. 5. The method of claim 1, wherein adjusting the actuator to close the charge air cooler valve arranged in an inlet tank of the charge air cooler to direct air flow through a second volume of the charge air cooler where the second volume is a subset of an entire, first volume of the charge air cooler and wherein the first volume and the second volume both have cooling tube inlets positioned within the inlet tank of the first volume. 6. The method of claim 5, further comprising, determining an estimated condensation formation value within the charge air cooler; andadjusting the volume of the charge air cooler based on the estimated condensation formation value within the charge air cooler having been determined by the electronic control unit based on engine operating conditions. 7. The method of claim 6, wherein the determining operating conditions of the compressor further comprises: determining a current compressor operation in the non-surge region, andwherein determining the estimated condensation formation value within the charge air cooler are based on mass air flow, ambient temperature, charge air cooler outlet temperature, and an EGR amount. 8. The method of claim 6, wherein the adjusting the volume of the charge air cooler based on the estimated condensation formation value further comprises: closing the charge air cooler valve arranged in an inlet tank of the charge air cooler to direct air flow through a subset of an entirety of the charge air cooler when the estimated condensation value exceeds a threshold, andopening the charge air cooler valve to direct air flow through the entirety of the charge air cooler when the estimated condensation value is less than a threshold,where the subset of the entirety and the entirety of the charge air cooler share some cooling tube inlets positioned within the inlet tank of the entirety of the charge air cooler, the shared cooling tube inlets being adjacent to remaining cooling tube inlets of the entirety of the charge air cooler. 9. A method of operating a turbocharged engine having an electronic control unit including non-transitory instructions stored in memory, the method comprising: determining operating conditions of a compressor;under a first condition, routing intake air through a second volume of a charge air cooler (CAC) via adjusting a charge air cooler valve (CAC valve) based on a compressor surge condition of the compressor, the second volume being a subset of a first volume of the CAC; andunder a second condition, selectively routing intake air through the first or second volume via adjusting the CAC valve based on an estimated condensation formation value within the CAC. 10. The method of claim 9, wherein the first condition comprises current or predicted compressor operation within a surge region, and wherein the second condition comprises compressor operation within a non-surge region. 11. The method of claim 10, wherein the surge region comprises an area of a compressor flow map around a surge line, the surge line based on compressor pressure ratio and mass air flow. 12. The method of claim 9, wherein the intake air is intake air from the compressor and wherein routing the intake air through the second volume based on the compressor surge condition further comprises closing the CAC valve arranged in an inlet tank of the CAC to direct intake air flow from the compressor through the second volume and block air from flowing through a remaining portion of the first volume to prevent compressor surge, where the first volume and the second volume share some cooling tube inlets positioned within the inlet tank of the first volume, and where the closing the CAC valve is controlled by the electronic control unit. 13. The method of claim 9, wherein selectively routing intake air through the first or second volume based on the estimated condensation formation value further comprises, when the estimated condensation formation value is below a threshold, opening the CAC valve arranged in an inlet tank of the CAC to direct intake air flow from the compressor through the first volume, where the first volume is an entirety of the CAC and when the estimated condensation formation value is above the threshold, closing the CAC valve to direct intake air flow from the compressor through the second volume and block air from flowing through a remaining portion of the first volume, where the first volume and the second volume share some cooling tube inlets positioned within the inlet tank of the first volume, and where the opening and closing the CAC valve is controlled by the electronic control unit. 14. The method of claim 9, wherein the condensation formation value is estimated based on engine load and CAC outlet temperature, wherein the CAC includes a plurality of cooling tubes, and wherein all the cooling tubes of the plurality of cooling tubes comprise the first volume and a portion of the plurality of cooling tubes comprise the second volume. 15. An engine system, comprising: a charge air cooler;a charge air cooler valve configured to selectively route intake air through a first volume or through a second volume of the charge air cooler, where the second volume is a subset of the first volume and the second volume shares some cooling tube inlets positioned within an inlet tank of the first volume;a turbocharger including a compressor and a turbine; anda controller including non-transitory instructions stored in memory to: when the compressor is operating in or predicted to operate in a surge region, adjust a position of the charge air cooler valve based on compressor conditions; andwhen the compressor is operating in a non-surge region, adjust the position of the charge air cooler valve based an estimated condensation formation value within the charge air cooler. 16. The engine system of claim 15, further comprising a compressor recirculation valve, and wherein the controller includes further instructions to, if the position of the charge air cooler valve is adjusted based on the estimated condensation formation value, adjust a position of the compressor recirculation valve to avoid compressor surge. 17. The engine system of claim 15, wherein when the charge air cooler valve is open, air is routed through the first volume and when the charge air cooler valve is closed, air is routed through the second volume, wherein the shared cooling tube inlets are adjacent to remaining tube inlets of the first volume, and wherein the charge air cooler includes a plurality of cooling tubes, where all the cooling tubes of the plurality of cooling tubes comprise the first volume and a portion of the plurality of cooling tubes comprise the second volume. 18. The engine system of claim 17, wherein the controller includes further instructions to close the charge air cooler valve when the compressor is operating in or predicted to operate in the surge region. 19. The engine system of claim 17, wherein the controller includes further instructions to open the charge air cooler valve when the estimated condensation formation value is below a threshold and close the charge air cooler valve when the estimated condensation formation value is above the threshold. 20. The engine system of claim 17, wherein the controller includes further instructions to open the charge air cooler valve when a compressor outlet temperature is above a threshold.
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