Supercharged internal combustion engine

Abstract

A supercharged internal combustion engine includes an intake tract and a throttle element. Between the compressor and the throttle element, the intake tract is gas-conductively connected on the low-pressure side to a first line and on the high-pressure side to a second line via an overrun air recirculation valve. A fuel tank having an activated carbon filter is provided for supplying fuel to the internal combustion engine, the fuel tank being gas-conductively connected via a valve to a tank venting valve. Between the compressor and the throttle element, the intake tract is gas-conductively connected on the low-pressure side to a third line and on the high-pressure side to a fourth line via the tank venting valve. The overrun air recirculation valve and the tank venting valve are arranged in parallel in terms of flow and the first and third lines and the second and fourth lines are, at least in sections, the same lines.

Claims

1. A supercharged internal combustion engine comprising: an intake tract in which a compressor is arranged; and a throttle element that is arranged in the intake tract between the compressor and the internal combustion engine, wherein between the compressor and the throttle element, the intake tract is gas-conductively connected on the low-pressure side to a first line and on the high-pressure side to a second line via an overrun air recirculation valve, a fuel tank having an activated carbon filter is provided for supplying fuel to the internal combustion engine, the fuel tank being gas-conductively connected via a valve to a tank venting valve, between the compressor and the throttle element, the intake tract is gas-conductively connected on the low-pressure side to a third line and on the high-pressure side to a fourth line via the tank venting valve, and the overrun air recirculation valve and the tank venting valve are arranged in parallel in terms of flow and the first and third lines and the second and fourth lines are, at least in sections, the same lines, wherein the throttle element is disposed in the fourth line.

2. The supercharged internal combustion engine as claimed in claim 1, wherein the overrun air recirculation valve and the tank venting valve are arranged in a common housing, and the tank venting valve comprises a Venturi nozzle and a flow widening valve.

3. The supercharged internal combustion engine as claimed in claim 2, wherein the activated carbon filter is gas-conductively connected to the intake tract via the valve.

4. The supercharged internal combustion engine as claimed in claim 3, wherein a first throttle element, via which the tank venting valve is shut off, is provided in the first or second line.

5. The supercharged internal combustion engine as claimed in claim 1, wherein the tank venting valve comprises a Venturi nozzle and a flow widening valve.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) FIG. 1 is a schematical depiction of an internal combustion engine according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE DRAWING

(2) FIG. 1 shows a supercharged internal combustion engine 1 according to the embodiments of the invention having an intake tract 2, in which a compressor 3, e.g. a compressor of an exhaust turbocharger or a supercharger, is arranged. Also arranged in the intake tract 2, between the compressor 3 and the internal combustion engine 1, is a throttle element 4, e.g. a throttle valve. Between the compressor 3 and the throttle element 4, the intake tract 2 can be gas-conductively connected on the low-pressure side to a first line 5 and on the high-pressure side to a second line 6 by means of an overrun air recirculation valve 7, wherein it should also be possible to fully close the overrun air recirculation valve 7.

(3) To supply fuel to the internal combustion engine 1, a fuel tank 8 is furthermore provided, having an activated carbon filter 16, which can be gas-conductively connected to a tank venting valve 10 by means of a valve 9. Between the compressor 3 and the throttle element 4, the intake tract 2 can furthermore be gas-conductively connected on the low-pressure side to a third line 11 and on the high-pressure side to a fourth line 12 by means of the tank venting valve 10.

(4) According to the embodiments of the invention, the overrun air recirculation valve 7 and the tank venting valve 10 are arranged in parallel in terms of flow, and the first line 5 and the third line 11 and the second line 6 and the fourth line 12 are, at least in sections, the same lines.

(5) The overrun air recirculation valve 7 and the tank venting valve 10 are furthermore arranged in a common housing 13 in order to save installation space.

(6) For a particularly robust embodiment, the tank venting valve 10 includes a Venturi nozzle 14 and a flow widening valve 15.

(7) In a further advantageous embodiment, the fuel tank 8 and the activated carbon filter 16 in the embodiment example in FIG. 1 can be gas-conductively connected to the intake tract 2 by means of the valve 9. It is thus possible to draw the hydrocarbon vapors out of the activated carbon filter 16 by means of the vacuum prevailing in the intake tract in the unsupercharged mode of the internal combustion engine and feed them to combustion.

(8) As an option, a first throttle element 18, by means of which the tank venting valve 10 can be shut off, is provided in the first line 5. As an alternative, the throttle element 18 can also be arranged in the second line 6, as illustrated in FIG. 1. By means of this embodiment, hydrocarbon vapors are drawn out of the activated filter 16 only when required.

(9) The combination according to the embodiments of the invention of two functions in a valve combination (overrun air recirculation valve 7 in parallel with the tank venting valve 10 in a single housing 13) eliminates the duplicated gas supply and gas discharge lines 5, 6, 11, 12 to and from the valves 7, 10, the second control cable for the valves 7, 10 and a second component holder for a second housing. Advantages thus arise in terms of costs, installation space and weight without functional disadvantages.

LIST OF REFERENCE SIGNS

(10) 1. internal combustion engine 2. intake tract 3. compressor 4. throttle element 5. first line 6. second line 7. overrun air recirculation valve 8. fuel tank 9. valve 10. tank venting valve 11. third line 12. fourth line 13. housing 14. Venturi nozzle 15. flow widening valve 16. activated carbon filter 17. manifold 18. first throttle element

(11) The foregoing disclosure has been set forth merely to illustrate the embodiments of the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.