Method of controlling an operation of an inlet valve system and an inlet valve control system

Patent metadata

Field	Value
Publication number	US-10428746-B2
Application number	US-201415532237-A
Country	US
Kind code	B2
Filing date	Dec 8, 2014
Priority date	Dec 8, 2014
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A method of controlling an operation of an inlet valve system arranged in connection with each cylinder of an internal combustion piston engine, includes monitoring at least one parameter relating to engine load conditions, controlling using a primary control procedure an opening and closing timing of an inlet valve in response to the at least one parameter, and feeding charge air into the cylinder when the inlet valve is open. In a secondary control procedure a parameter relating to engine load conditions is measured and the closing timing of the inlet valve of the inlet valve system is controlled in response to the at least parameter independently from and with higher priority than the primary control procedure.

First claim

The invention claimed is:

1. A method of controlling an operation of an inlet valve system arranged in connection with each cylinder of an internal combustion piston engine, which method comprises during the operation of the engine steps of
1) Monitoring at least one parameter relating to engine load conditions,
2) Controlling, using a primary control procedure, a closing timing of an inlet valve of the inlet valve system in response to the at least one parameter obtained in the step 1), before a bottom dead center, wherein the primary control procedure closes the inlet valve within a first range between a first crank angle value and a second crank angle value before the bottom dead center, and
3) Feeding charge air into the said cylinder via the inlet valve of the inlet valve system when the inlet valve is open,

and by using a secondary control procedure the closing timing of the inlet valve of the inlet valve system is controlled in response to at least one parameter relating to the engine load conditions independently from and with higher priority than by using the primary control procedure,
which secondary procedure closes the inlet valve within a second range between a third crank angle and a fourth crank angle in respect to the bottom dead center, which third crank angle is outside the first range, and the third crank angle is closer to the bottom dead center than the first range.

2. A method of controlling an operation of an inlet valve system according to claim 1 , wherein in the secondary control procedure the at least one parameter is a measured pressure of the charge air.

3. A method of controlling an operation of an inlet valve system according to claim 1 wherein the secondary control procedure is practiced parallel with and independently on the primary control procedure, which secondary procedure closes the inlet valve at a third crank angle in respect to the bottom dead center, which third crank angle is equal to or less than the second crank angle value.

4. A method of controlling an operation of an inlet valve system according to claim 3 , wherein the first range is 70-100 degrees before the bottom dead center.

5. A method of controlling an operation of an inlet valve system according to claim 3 , wherein the first range is 70-100 degrees before the bottom dead center, and the second range is 55-70 degrees before the bottom dead center.

6. A method of controlling an operation of an inlet valve system according to claim 1 , wherein the at least one parameter for the primary control procedure and the at least one parameter for the secondary control procedure are acquired independently from each other.

7. A method of controlling an operation of an inlet valve system according to claim 1 , wherein the at least one parameter for the primary control procedure and the at least one parameter for the secondary control procedure are different parameters.

8. A method of controlling an operation of an inlet valve system according to claim 1 , wherein the at least one parameter for the primary control procedure and for the secondary control procedure is the same parameter.

9. A method of controlling an operation of an inlet valve system according to claim 1 , wherein charge air is fed to the engine pressurized in two super-charging stages.

10. A method of controlling an operation of an inlet valve system according to claim 1 , wherein the charge air fed into the cylinder at a pressure higher than 5 bar.

11. A method of controlling an operation of an inlet valve system according to claim 1 , wherein the secondary control procedure closes the inlet valve at latest at a crank angle which result in compression pressure lower than a predetermined maximum compression pressure prior to ignition.

12. A method of controlling an operation of an inlet valve system according to claim 1 , wherein the primary control procedure and secondary control procedure are used for control a common mechanical actuator.

13. A method of controlling an operation of an inlet valve system according to claim 1 , wherein the primary control procedure and secondary control procedure are used for control a mechanical actuator dedicated to the each of the primary control procedure and secondary control procedure.

14. A method of controlling an operation of an inlet valve system according to claim 1 , wherein the first range is 70-100 degrees before the bottom dead center, and the second range is 55-70 degrees before the bottom dead center.

15. An inlet valve control system for use in connection with a cylinder-of an internal combustion piston engine, the inlet valve control system-comprising:
a monitoring unit arranged to monitor at least one parameter relating to engine load conditions, a primary control unit arranged to control closing timing of an inlet valve of the inlet valve system in response to at least one parameter relating to the engine load conditions,
wherein the inlet valve control system comprises a secondary control unit arranged to control the closing timing of the inlet valve in response to at least one parameter relating to the engine load conditions independently from and with higher priority than the primary control unit, and
wherein the primary control unit is arranged to close the inlet valve within a first range between a first crank angle value and a second crank value in respect to the bottom dead center, and the secondary control unit is arranged to close the inlet valve within a second range between a third crank angle and a fourth crank angle before a bottom dead center, wherein the third crank angle is outside the first range, and the third crank angle is closer to the bottom dead center than the first range.

16. An inlet valve control system according to claim 15 , wherein the secondary control unit is arranged to control the closing timing of the inlet valve in response to measured pressure and/or temperature of the charge air.

17. An inlet valve control system according to claim 15 , wherein the primary control unit is arranged to close the inlet valve-within a range of 70-100 degrees before the bottom dead center.

18. An inlet valve control system according to claim 15 , wherein the primary control unit is arranged to close the inlet valve-within a range of 70-100 degrees before the bottom dead center and the secondary control unit is arranged to close the inlet valve arranged to close the inlet valve within a range of 55-70 degrees before the bottom dead center.

19. An inlet valve control system according to claim 15 wherein the secondary control unit is arranged to control the closing timing of the inlet valve by actuating a mechanical valve closing system.

20. An inlet valve control system according to claim 15 wherein the primary control unit is provided with computer executable instructions to control closing timing of an inlet valve of the inlet valve system in response to at least one parameter relating to engine load conditions, and the secondary control unit is provided with computer executable instructions to close the inlet valve in response to at least one parameter relating to the engine load conditions independently from and with higher priority than the primary control unit.

21. An inlet valve control system according to claim 15 , wherein the primary control unit and the secondary control unit are arranged to control a mechanical actuator dedicated to each of the control units.

22. An inlet valve control system according to claim 15 , wherein the primary con

Assignees

• Waertsilae Finland Oy

Inventors

• Hedvik Sören
• Sundsten Magnus

Classifications

• F01L1/16

  Silencing impact; Reducing wear · CPC title

• F02D13/0234 Primary

  changing the valve timing only · CPC title

• F01L2013/0089

  with means for delaying valve closing · CPC title

• F01L1/26

  characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder (with coaxial valves F01L1/28) · CPC title

• F01L1/146 Primary

  Push-rods · CPC title