Cam actuated gas admission valve with electro-hydraulic trim control

Patent metadata

Field	Value
Publication number	US-11566545-B2
Application number	US-201916401765-A
Country	US
Kind code	B2
Filing date	May 2, 2019
Priority date	May 2, 2019
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A gas engine is disclosed. The gas engine may include a combustion cylinder. The combustion cylinder may include an intake with an intake valve. The combustion cylinder may include an exhaust with an exhaust valve. The gas engine may include a gas admission valve assembly coupled to the intake. The gas admission assembly may include a trimmable electro-hydraulically actuatable gas admission valve to control a gas flow into the intake.

First claim

What is claimed is:

1. A gas admission valve assembly, comprising:
an actuation cylinder,
a hydraulic piston having a top end configured to be actuated by a cam and a bottom end opposite the top end, the hydraulic piston being disposed in the actuation cylinder,
a check valve to supply a hydraulic fluid to a first portion of the actuation cylinder,
an electronic controlled valve to remove the hydraulic fluid from the first portion of the actuation cylinder,
a fuel supply to supply a fuel to a second portion of the actuation cylinder,
an admission valve to remove the fuel from the second portion of the actuation cylinder, wherein the admission valve includes a body having a first end and a second end opposite the first end, the first end defining an end of the first portion and the second end defining an end of the second portion, the first portion defining a hydraulic actuation chamber that extends from the first end of the admission valve to the bottom end of the hydraulic piston, and
an electronic control module to control the electronic controlled valve to alter a hydraulic pressure in the first portion of the actuation cylinder and to control whether the admission valve is opened by rotation of the cam.

2. The gas admission valve assembly of claim 1 , wherein the hydraulic fluid is engine lubrication oil.

3. The gas admission valve assembly of claim 1 , wherein the fuel is natural gas.

4. A gas admission valve system, comprising:
an air intake for delivering fuel to a natural gas engine, and
a gas admission valve assembly including:
an actuation cylinder defining a hydraulic chamber,
a hydraulic piston to be actuated by a cam towards the hydraulic chamber and disposed in the actuation cylinder,
a seal to seal the hydraulic piston,
a first spring connected to the hydraulic piston to bias the hydraulic piston towards the cam, the first spring also being connected between the seal and a spring support within the actuation cylinder,
a check valve to supply a hydraulic fluid to a first portion of the actuation cylinder,
an electronic controlled valve to remove the hydraulic fluid from the first portion of the actuation cylinder,
a fuel supply to supply the fuel to a second portion of the actuation cylinder,
an admission valve to remove the fuel from the second portion of the actuation cylinder, and
a second spring connected to the admission valve to bias the admission valve towards the cam, the second spring extending between a valve seat and a body of the admission valve,

an electronic control module to control the electronic controlled valve to alter a hydraulic pressure in the first portion of the actuation cylinder and to control extent of movement of the admission valve,
wherein the admission valve delivers fuel to the air intake of the natural gas engine.

5. The gas admission valve system of claim 4 , wherein the electronic control module is configured to control the electronic controlled valve to alter an air/fuel ratio of a combustion cylinder of the natural gas engine.

6. The gas admission valve system of claim 4 , wherein the electronic control module is configured to control the electronic controlled valve based on a pressure measurement associated with a combustion cylinder of the natural gas engine.

7. The gas admission valve assembly of claim 1 , wherein the electronic control module is configured to close the electronic controlled valve to increase a rate of injection of the fuel via the admission valve.

8. The gas admission valve assembly of claim 1 , wherein the electronic control module is configured to open the electronic controlled valve to decrease a rate of injection of fuel via the admission valve.

9. The gas admission valve assembly of claim 1 , wherein the electronic control module is configured to actuate the electronic controlled valve at any angular position of the cam.

10. The gas admission valve system of claim 4 , wherein the hydraulic fluid is engine lubrication oil.

11. The gas admission valve system of claim 4 , wherein the electronic control module is configured to close the electronic controlled valve to increase a rate of injection of the fuel via the admission valve.

12. The gas admission valve system of claim 4 , wherein the electronic control module is configured to open the electronic controlled valve to decrease a rate of injection of fuel via the admission valve.

13. A gas admission valve assembly, comprising:
an actuation housing,
a hydraulic piston having a top end configured to be actuated by a cam and bottom end opposite the top end, the hydraulic piston being disposed in the actuation housing,
an electronic controlled valve to alter a quantity of hydraulic fluid in a first portion of the actuation housing,
a fuel supply to supply a fuel to a second portion of the actuation housing,
an admission valve to remove the fuel from the second portion of the actuation housing, the first portion defining a hydraulic actuation chamber that extends from a first end of the admission valve to the bottom end of the hydraulic piston, and
an electronic control module to control the electronic controlled valve to alter a hydraulic pressure in the first portion of the actuation housing based on a pressure measurement received from a pressure sensor, the pressure measurement being associated with a combustion cylinder of an internal combustion engine.

14. The gas admission valve assembly of claim 13 , wherein the hydraulic fluid is engine lubrication oil.

15. The gas admission valve assembly of claim 13 , wherein the fuel is natural gas.

16. The gas admission valve assembly of claim 13 , wherein the electronic control module is configured to close the electronic controlled valve to increase a rate of injection of the fuel via the admission valve.

17. The gas admission valve assembly of claim 13 , wherein the electronic control module is configured to open the electronic controlled valve to decrease a rate of injection of fuel via the admission valve.

18. The gas admission valve assembly of claim 13 , wherein the electronic control module is configured to actuate the electronic controlled valve at any angular position of the cam.

Assignees

• Caterpillar Inc

Inventors

• Chang David Yu Zhang
• Montgomery David Todd
• Fiveland Scott
• Shafer Scott F

Classifications

• F01L1/04

  by means of cams, camshafts, cam discs, eccentrics or the like (F01L1/10 takes precedence) · CPC title

• F01L1/24 Primary

  by fluid means, e.g. hydraulically · CPC title

• F02D2200/024

  Fluid pressure of lubricating oil or working fluid · CPC title

• F02D41/14

  Introducing closed-loop corrections · CPC title

• F01L2001/2427

  by means of an hydraulic adjusting device located between cam and push rod · CPC title