DEAERATING AND AERATING DEVICE FOR A SUPERCHARGED INTERNAL COMBUSTION ENGINE

• US 20100000499A1
• Filed: 04/19/2007
• Published: 01/07/2010
• Est. Priority Date: 04/25/2006
• Status: Active Grant

• Current Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Original Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Inventors: Braun, Mirko, Ruppel, Stefan, Ozkaya, Yakup, Dunsch, Robert
• Granted Patent: US 8,191,538 B2
• Time in Patent Office: Days
• US Class Current: 123/559.1
• CPC Class Codes: F01M 13/022 using engine inlet suction
• CPC Class Codes: F01M 13/028 of positive pressure
• CPC Class Codes: F01M 2013/0005 with systems regulating the pressure in the carter

Abstract

The present invention relates to a deaerating and aerating device (19) for an internal combustion engine (1) for discharging blowby gas out of a crankcase (3), comprising a first line (20) which is connected at one end to the crankcase (3) and at the other end to a fresh gas line (7) downstream of a supercharging device (10) and which contains a deaerating valve (23), and a second line (21) which is connected at one end to the fresh gas line (7) upstream of the supercharging device (10) and at the other end to the crankcase (3) and which contains a throttle device (28) and, parallel thereto, a non-return check valve (29) which provides a blocking action in the direction of the crankcase (3).

Claims

1. A deaerating and aerating device for a supercharged internal combustion engine, in particular in a motor vehicle, for discharging blow-by gas out of a crankcase of the internal combustion engine, comprising:

a first line, which is selectively connected to the crankcase at one end, and which is selectively connected at the other end downstream from a supercharging device of the internal combustion engine to a fresh gas line of the internal combustion engine, and which contains a deaerating valve that is designed so that beyond a predetermined limit value of a pressure difference applied thereto, it limits a volume flow leading to the fresh gas line to a predetermined target value, and

a second line, which is selectively connected at one end upstream from the charging device to the fresh gas line which is selectively connected at the other end to the crankcase and which contains a throttle device designed, so that at a predetermined target value of a pressure difference applied thereto, it adjusts a volume flow leading to the crankcase;

whereby the second line contains parallel to the throttle device a nonreturn cutoff valve which blocks the flow from the fresh gas line to the crankcase, so that the throttle device forms a bypass that bypasses the nonreturn cutoff valve.

2. The deaerating and aerating device according to claim 1, characterized in that

one of the bypass and the throttle device are integrated into the nonreturn cutoff valve.

3. The deaerating and aerating device according to claim 1, characterized in that

an opening resistance and a flow-through resistance of the nonreturn cutoff valve are lower than a flow-through resistance of one of the bypass and the throttle device.

4. The deaerating and aerating device according to claim 1, characterized in that

an opening resistance and a flow-through resistance of the nonreturn cutoff valve are selected so that the vacuum prevailing at a connection point at which the second line is connected to the fresh gas line is sufficient in full-load operation of the internal combustion engine to adjust one of a predetermined vacuum in the crankcase and to exhaust a predetermined amount of blow-by gas.

5. The deaerating and aerating device according to claim 1, characterized in that

the first line contains a nonreturn cutoff device which cuts off the flow from the fresh gas line to the connection point.

6. The deaerating and aerating device according to claim 5,

characterized in that

the nonreturn cutoff device is integrated into the deaerating valve.

7. The deaerating and aerating device according to claim 1,

characterized in that

the deaerating valve one of the bypass and the throttle device are coordinated with one another, so that in idling operation of the internal combustion engine one of the pressure drop in the crankcase is limited to a predetermined vacuum, and the blow-by gas exhausting from the crankcase is limited to a predetermined volume flow.

8. The deaerating and aerating device according to claim 1, characterized in that the first line is connected to the fresh gas line downstream from at least one of a supercharging air cooler, a throttle valve, and an introduction point of an exhaust gas recirculation device.

9. The deaerating and aerating device according to claim 1, characterized in that the second line is connected to the fresh gas line downstream from at least one of an air flow meter, and an air filter.

10. The deaerating and aerating device according to claim 1, characterized in that

a separator device for separating at least one of oil and droplets from the blow-by gas is provided in the first line and in the second line.

11. The deaerating and aerating device according to claim 2, characterized in that an opening resistance and a flow-through resistance of the nonreturn cutoff valve are lower than a flow-through resistance of one of the bypass and the throttle device.

12. The deaerating and aerating device according to claim 2, characterized in that an opening resistance and a flow-through resistance of the nonreturn cutoff valve are selected so that the vacuum prevailing at a connection point at which the second line is connected to the fresh gas line is sufficient in full-load operation of the internal combustion engine to adjust one of a predetermined vacuum in the crankcase and to exhaust a predetermined amount of blow-by gas.

13. The deaerating and aerating device according to claim 2, characterized in that the first line contains a nonreturn cutoff device which cuts off the flow from the fresh gas line to the connection point.

14. The deaerating and aerating device according to claim 2, characterized in that the deaerating valve and one of the bypass and the throttle device are coordinated with one another, so that in idling operation of the internal combustion engine one of the pressure drop in the crankcase is limited to a predetermined vacuum, and the blow-by gas exhausting from the crankcase is limited to a predetermined volume flow.

15. The deaerating and aerating device according to claim 2, characterized in that the first line is connected to the fresh gas line downstream from a supercharging air cooler and a throttle valve.

16. The deaerating and aerating device according to claim 2, characterized in that the first line is connected to the fresh gas line downstream from a supercharging air cooler and an introduction point of an exhaust gas recirculation device.

17. The deaerating and aerating device according to claim 2, characterized in that the first line is connected to the fresh gas line downstream from a supercharging air cooler, a throttle valve, and an introduction point of an exhaust gas recirculation device.

18. The deaerating and aerating device according to claim 2, characterized in that the second line is connected to the fresh gas line downstream from at least one of an air flow meter and an air filter.

19. The deaerating and aerating device according to claim 2, characterized in that a separator device for separating at least one of oil and oil droplets from the blow-by gas is provided in the first line and in the second line.

20. The deaerating and aerating device according to claim 3, characterized in that the second line is connected to the fresh gas line downstream from at least one of an air flow meter and an air filter.