ENGINE EXHAUST SYSTEM

Claims

1. A method for supplying a fuel-air mixture to a vehicle engine, comprising: determining the pressure difference between the air intake pressure for air flowing to the engine and the exhaust gas pressure for exhaust gas flowing out of the engine; determining, on the basis of at least said pressure difference, the amount of fuel to be injected into the engine; and injecting a specified amount of fuel into the engine.

2. The method according to paragraph 1, characterized in that the determination of the pressure difference includes: determination of air intake pressure; and determination of exhaust gas pressure.

3. The method according to paragraph 1, further comprising: determining the engine speed; and in this case, the amount of fuel to be injected is additionally determined on the basis of the specified engine speed.

4. The method according to paragraph 1, further comprising: throttle position determination; and in this case, the amount of fuel to be injected is additionally determined on the basis of the specified throttle position.

5. The method according to paragraph 1, further comprising: determination of the changed pressure difference; determining, based on at least said changed pressure difference, a specified quantity of fuel to be injected into the engine; and injecting a specified, precise amount of fuel into the engine.

6. The method according to paragraph 1, further comprising: determining that the pressure difference has increased; determining, based on at least the increased pressure difference, a reduced amount of fuel to be injected into the engine; and injecting a specified reduced amount of fuel into the engine.

7. The method according to paragraph 1, further comprising: determining that the pressure difference has decreased; determining, based on at least the reduced pressure difference, a reduced amount of fuel to be injected into the engine; and injecting a specified reduced amount of fuel into the engine.

8. A method for controlling the flow of exhaust gas from an engine, comprising: pressure determination; and movement, based at least on said pressure, of a valve hydraulically connected to the exhaust gas flow path in: a first position such that at least a majority of the exhaust gas flows along a first exhaust gas flow path, bypassing the exhaust gas turbine, the turbocharger; a second position such that at least a majority of the exhaust gas flows along a second exhaust gas flow path passing through the exhaust gas turbine; and at least one intermediate position between said first position and said second position such that the exhaust gas flows partly along the first exhaust gas flow path and partly along the second exhaust gas flow path.

9. The method according to paragraph 8, characterized in that: the determination of pressure includes the determination of the pressure difference; and The determination of the specified pressure difference includes: determining a predetermined boost pressure of the air flowing into the engine, and determination of the actual boost pressure of air flowing into the engine.

10. The method according to claim 9, characterized in that determining the actual boost pressure includes determining, using the first sensor, the air pressure at the intake for air flowing into the engine.

11. The method according to claim 9, characterized in that determining the predetermined boost pressure includes at least one of: determining the position of the throttle lever; and determining the degree of opening of the throttle valve.

12. The method according to claim 9, characterized in that determining the predetermined boost pressure includes at least one of: determining the position of the throttle lever; determining the engine speed; and determining the degree of opening of the throttle valve.

13. The method according to paragraph 9, further comprising: determining that the difference between the preset boost pressure and the actual boost pressure is less than a threshold difference; determining, based on said difference being less than a threshold difference, a desired valve position for the valve from a set of fine adjustment data relating to fine adjustment of the pressure, wherein the set of fine adjustment data provides a desired valve position to reduce the difference between a predetermined boost pressure and an actual boost pressure, wherein the set of fine adjustment data is based on at least one of a throttle position and an engine speed; and movement of the valve to the required valve position following the determination of the required valve position.

14. The method according to claim 8, characterized in that determining the pressure includes determining the pressure difference; and additionally includes: determining that the pressure difference is greater than the threshold difference; determining, based on a pressure difference that is greater than a threshold difference, a desired valve position for a valve from a set of coarse adjustment data relating to a coarse pressure adjustment, wherein the set of coarse adjustment data provides a desired valve position to reduce the difference between the desired boost pressure and the intake pressure, wherein the set of coarse adjustment data is based on at least one of a throttle position and an engine speed; and movement of the valve to the required valve position following the determination of the required valve position.

15. The method according to paragraph 8, characterized in that: The definition of pressure includes: determining, using a first sensor, the air intake pressure for air flowing into the engine, and determining, using a second sensor, an exhaust gas pressure for exhaust gas flowing from the engine; and wherein the method additionally includes: determining a predetermined pressure difference between the exhaust gas pressure and the intake air pressure; and determining that the difference between the pressure difference and a predetermined pressure difference is different from zero; and moving the valve based on at least said pressure, comprising moving the valve based on at least said difference being different from zero, and moving the valve to one of: second position; and at least one intermediate position.

16. The method according to claim 15, characterized in that the predetermined pressure difference is determined based on the throttle position and engine speed.

17. A method for controlling the flow of exhaust gas from an engine, comprising: determination of the throttle position using the throttle position sensor; determining, using the engine sensor, the engine speed for the engine; moving, based on at least one of the throttle position and the engine speed, a valve hydraulically connected between the turbocharger and the engine to one of: a first position such that at least a majority of the exhaust gas flows along a first exhaust gas flow path, bypassing the exhaust gas turbine, the turbocharger; a second position such that at least a majority of the exhaust gas flows along a second exhaust gas flow path passing through the exhaust gas turbine; and at least one intermediate position between said first position and said second position, such that the exhaust gas flows partly along the first exhaust gas flow path and partly along the second exhaust gas flow path.

18. The method of claim 17, wherein the valve movement is based on at least one of a throttle position, an engine speed, and a temperature of an exhaust pipe operatively connected to the engine.

19. The method according to paragraph 17, further comprising: determination of pressure difference by: determining a preset boost pressure of air flowing into the engine, wherein the predetermined boost pressure is determined based on at least one of the throttle position and the engine speed, and determining the actual boost pressure of the air flowing into the engine; and in this case, the valve movement is additionally based on the specified pressure difference.

20. The method according to claim 19, characterized in that determining the actual boost pressure includes determining, using the first sensor, the air pressure at the intake of air flowing into the engine.

21. The method according to paragraph 17, further comprising: determining the temperature of the outlet pipe located in the flow direction upstream of the valve; and wherein the valve movement is additionally based on the specified outlet pipe temperature.

22. The method according to paragraph 17, further comprising, before moving the valve: determining whether the engine is operating at low altitude or high altitude; extracting, after determining that the engine is operating at low altitude, the desired valve position from the low altitude data set; extracting, after determining that the engine is operating at high altitude, the desired valve position from the high altitude data set; and in this case: moving the valve includes moving the valve to a specified desired position, wherein the desired position is one of a first position, a second position and at least one intermediate position.

23. The method according to claim 22, characterized in that determining whether the engine is operating at a low altitude above sea level or at a high altitude above sea level includes determining the atmospheric pressure using the first pressure sensor.

24. The method according to paragraph 17, further comprising: determining, based on at least one of the throttle position and the engine speed, a threshold engine pressure difference; determination of the actual engine pressure difference; determining that the actual pressure difference is greater than the threshold pressure difference; and moving, based at least on an actual pressure difference that is greater than a threshold pressure difference, the valve to a first position if the valve is in one of a second position and at least one intermediate position.

25. The method according to paragraph 24, characterized in that determining the actual pressure difference of the engine includes: determination, using a pressure sensor at the outlet, of the pressure at the outlet along the flow after the engine; determining, using an intake air sensor, the intake air pressure in the flow direction before the engine; and determination of the specified difference in pressure between the exhaust and intake air pressure.

26. A method for controlling the flow of exhaust gas from an engine, comprising: determining that the exhaust gas pressure of the air flowing out of the engine exceeds the exhaust gas pressure threshold, positioning a valve fluidly coupled between the turbocharger and the engine in a first position such that a majority of the exhaust gas flows along a first exhaust gas flow path passing through an exhaust gas turbine of the turbocharger; and moving the valve, based at least on the exhaust gas pressure exceeding the threshold exhaust gas pressure, to one of: a second position such that at least a majority of the exhaust gas flows along a second exhaust gas flow path, bypassing the exhaust gas turbine; and at least one intermediate position between said first position and said second position, such that the exhaust gas flows partly along the first exhaust gas flow path and partly along the second exhaust gas flow path.