Methods and systems are provided for discharging condensate from a turbocharger arrangement of an internal combustion engine. Specifically, in on example, condensate may be drained from a condensate reservoir by opening a drain valve coupled to the condensate reservoir. Further, the drain valve may
Methods and systems are provided for discharging condensate from a turbocharger arrangement of an internal combustion engine. Specifically, in on example, condensate may be drained from a condensate reservoir by opening a drain valve coupled to the condensate reservoir. Further, the drain valve may be closed responsive to engine operating conditions indicating the condensate reservoir has been completely drained.
대표청구항▼
1. An engine method, comprising: determining engine operating conditions including an initial engine pressure;determining whether it is time to open a drain valve based on the engine operating conditions, and if so, opening the drain valve, the drain valve arranged in a connecting line, the connecti
1. An engine method, comprising: determining engine operating conditions including an initial engine pressure;determining whether it is time to open a drain valve based on the engine operating conditions, and if so, opening the drain valve, the drain valve arranged in a connecting line, the connecting line coupled to an outlet of a condensate reservoir, the condensate reservoir fluidly coupled to an intake tract downstream of a charge air cooler; andclosing the drain valve in response to an engine pressure decreasing below the initial engine pressure by a threshold amount,wherein the opening the drain valve includes opening the drain valve at pre-determined time intervals during engine operation. 2. The engine method of claim 1, wherein the opening the drain valve includes opening the drain valve responsive to engine operating conditions and wherein the engine operating conditions include one or more of ambient air temperature and temperatures of the charge air cooler. 3. The engine method of claim 1, further comprising opening the drain valve only during steady-state engine operating conditions, the steady-state engine operating conditions including a constant torque demand. 4. The engine method of claim 1, wherein determining engine operating conditions further comprises determining an initial air-fuel ratio, the method further comprising closing the drain valve in response to an air-fuel ratio decreasing below the initial air-fuel ratio by a threshold amount. 5. The engine method of claim 1, wherein determining engine operating conditions further comprises determining an initial mass air flow, the method further comprising closing the drain valve in response to a mass air flow in the intake tract upstream of the condensate reservoir increasing above the initial mass air flow by a threshold amount. 6. The engine method of claim 1, wherein the engine pressure is an engine intake pressure and wherein the threshold amount is determined based on a pressure drop associated with charge air escaping from the intake tract through the condensate reservoir and the drain valve. 7. An engine system, comprising: an intake manifold of an engine;a turbocharger;a charge air cooler positioned in an intake tract, upstream of the intake manifold;a condensate reservoir coupled to the intake tract, downstream of the charge air cooler, an outlet of the condensate reservoir coupled to an exhaust gas tract via a connecting line, a drain valve arranged in the connecting line controlling a flow of condensate from the condensate reservoir to a portion of the exhaust gas tract which is downstream of a diesel particulate filter and a catalytic converter; anda control unit with computer-readable instructions for determining an initial mass air flow in the intake tract, and then opening the drain valve to drain condensate from the condensate reservoir, and then closing the drain valve responsive to a mass air flow in the intake tract upstream of the condensate reservoir increasing above the initial mass air flow by a threshold amount. 8. The engine system of claim 7, wherein the instructions further include instructions for determining an initial air-fuel ratio before opening the drain valve, and instructions for closing the drain valve responsive to an air-fuel ratio decreasing below the initial air-fuel ratio by a threshold amount. 9. The engine system of claim 8, wherein the air-fuel ratio is determined by a lambda sensor positioned in the exhaust tract. 10. The engine system of claim 7, wherein the instructions further include instructions for determining an initial pressure difference before opening the drain valve, and instructions for closing the drain valve responsive to a pressure difference between the intake tract and ambient air decreasing below the initial pressure difference by a threshold amount. 11. The engine system of claim 7, wherein the instructions further include instructions for determining whether the engine is at steady-state and instructions for maintaining the drain valve closed when the engine is not at steady-state. 12. An engine method, comprising: determining engine operating conditions including an initial air-fuel ratio;determining whether it is time to open a drain valve based on the engine operating conditions, and if so, opening the drain valve, the drain valve fluidly communicating with a reservoir outlet of a condensate reservoir, the condensate reservoir fluidly coupled to an intake tract downstream of a charge air cooler; andclosing the drain valve in response to an air-fuel ratio decreasing below the initial air-fuel ratio by a threshold amount. 13. The engine method of claim 12, wherein the opening the drain valve includes opening the drain valve periodically at pre-determined time intervals during engine operation. 14. The engine method of claim 12, wherein the air-fuel ratio is measured with an air-fuel ratio sensor positioned in an exhaust gas tract downstream of an engine and upstream of one or more of a catalytic converter and a diesel particulate filter. 15. The engine method of claim 12, further comprising determining whether steady-state engine operating conditions are present and opening the drain valve only during steady-state engine operating conditions, the steady-state engine operating conditions including a constant torque demand. 16. The engine method of claim 12, wherein determining engine operating conditions further comprises determining an initial engine pressure, the method further comprising closing the drain valve in response to an engine pressure decreasing below the initial engine pressure by a threshold amount. 17. The engine method of claim 16, wherein the engine pressure is a pressure difference between an intake tract pressure and ambient air pressure. 18. The engine method of claim 12, wherein determining engine operating conditions further comprises determining an initial mass air flow, the method further comprising closing the drain valve in response to a mass air flow in the intake tract upstream of the condensate reservoir increasing above the initial mass air flow by a threshold amount. 19. The engine method of claim 12, wherein the threshold amount is determined based on a decrease in air-fuel ratio associated with charge air escaping from the intake tract through the condensate reservoir and the open drain valve.
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이 특허에 인용된 특허 (3)
Goettel Walter E. ; Cunkelman Brian L. ; Wagner Daniel G. ; Drummond Roger, Aftercooler bypass means for a locomotive compressed air system.
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