Device for controlling the compression rate of a variable compression ratio engine, comprising a two-way solenoid valve provided with a secondary circuit for fluid refilling

Patent metadata

Field	Value
Publication number	US-10830160-B2
Application number	US-201816490489-A
Country	US
Kind code	B2
Filing date	Feb 28, 2018
Priority date	Mar 1, 2017
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

A device for controlling the compression rate of a variable compression ratio engine comprises: an actuating cylinder comprising a piston defining two chambers for receiving a pressure fluid, a pressure accumulator supplying the pressure fluid, a first fluid circuit connecting the upper chamber to the accumulator and comprising a first valve assembly for controlling the flow of the fluid in the first fluid circuit, and a second fluid circuit connecting the lower chamber to the accumulator and comprising a second valve assembly for controlling the flow of a fluid in the second fluid circuit. At least one of the fluid circuits comprises a bypass conduit arranged so as to connect one of the chambers to the accumulator. The bypass conduit comprises a non-return valve.

First claim

The invention claimed is:

1. A device for controlling a compression ratio of a variable compression ratio engine, comprising:
an actuating cylinder comprising a piston defining two chambers for receiving a pressurized fluid on opposing sides of the piston;
a pressure accumulator supplying the pressurized fluid;
a first fluid circuit connecting a first chamber of the two chambers to the accumulator and comprising a first valve assembly for controlling the flow of the fluid in the first fluid circuit;
a second fluid circuit connecting a second chamber of the two chambers to the accumulator and comprising a second valve assembly for controlling the flow of the fluid in the second fluid circuit;
wherein at least one of the first fluid circuit and the second fluid circuit has a bypass conduit connecting at least one chamber of the two chambers to the accumulator, the bypass conduit including a non-return valve configured to block flow of the fluid from the at least one chamber to the accumulator.

2. The device of claim 1 , wherein the bypass conduit is arranged to make a circuit parallel to the respective fluid circuit connected to the chamber to which the bypass conduit is connected.

3. The device of claim 2 , wherein the bypass conduit is configured to connect the second chamber to the accumulator.

4. The device of claim 3 , wherein each of the first fluid circuit and the second fluid circuit comprises a bypass circuit comprising a non-return valve.

5. The device of claim 4 , wherein the first valve assembly and the second valve assembly are connected to the accumulator by a common conduit.

6. The device of claim 5 , wherein the first fluid circuit and the second fluid circuit, and the first valve assembly and the second valve assembly are arranged with a magnetic actuator to form a solenoid valve allowing the simultaneous opening and closing of the first and second chambers to which the valves are respectively connected.

7. The device of claim 1 , wherein the bypass conduit is configured to connect the second chamber to the accumulator.

8. The device of claim 1 , wherein each of the first fluid circuit and the second fluid circuit comprises a bypass circuit comprising a non-return valve.

9. The device of claim 1 , wherein the first valve assembly and the second valve assembly are connected to the accumulator by a common conduit.

10. The device of claim 1 , wherein the first fluid circuit and the second fluid circuit, and the first valve assembly and the second valve assembly are arranged with a magnetic actuator to form a solenoid valve allowing the simultaneous opening and closing of the first and second chambers to which the valves are respectively connected.

11. A solenoid valve, comprising:
two valve assemblies each for controlling the flow of a fluid supplied under pressure by a pressure accumulator, each valve assembly having a valve body comprising a longitudinal channel with an axis communicating with at least two fluid circuits; and
a valve arrangement comprising a piston movably mounted within the longitudinal channel between a fluid circuit opening position to allowing the fluid to pass from one fluid circuit to another and a fluid circuit closing position relative to each other, the piston comprising a magnetizable end portion and an end, opposite the magnetizable end portion, forming a valve adapted to rest against a seat to cause the closing position, and a single electromagnetic actuator adapted to simultaneously control the displacement of the piston of each valve assembly into the opening position of the fluid circuits, the actuator, interposed between the two valve assemblies, comprising an electromagnetic coil having a coil bore housing a stationary magnetizable target extending opposite the magnetizable end portions of the pistons of each valve assembly, wherein at least one of the fluid circuits of the solenoid valve comprising a bypass conduit provided with a non-return valve arranged to block the flow of fluid toward the accumulator.

12. The solenoid valve of claim 11 , wherein the non-return valve is connected in parallel with the fluid circuit to which it is connected.

13. The solenoid valve of claim 12 , wherein the non-return valve is connected in parallel with the part of the fluid circuit connecting the channel to the accumulator.

14. The solenoid valve of claim 13 , wherein each fluid circuit has a bypass circuit including a non-return valve.

15. The solenoid valve of claim 11 , wherein the non-return valve is connected in parallel with the part of the fluid circuit connecting the channel to the accumulator.

16. The solenoid valve of claim 11 , wherein each fluid circuit has a bypass circuit including a non-return valve.

17. A variable compression ratio engine comprising a device for controlling the compression ratio, the device comprising:
an actuating cylinder comprising a piston defining two chambers for receiving a pressurized fluid on opposing sides of the piston;
a pressure accumulator supplying the pressurized fluid;
a first fluid circuit connecting a first chamber of the two chambers to the accumulator and comprising a first valve assembly for controlling the flow of the fluid in the first fluid circuit;
a second fluid circuit connecting a second chamber of the two chambers to the accumulator and comprising a second valve assembly for controlling the flow of the fluid in the second fluid circuit;
wherein at least one of the first fluid circuit and the second fluid circuit has a bypass conduit connecting at least one chamber of the two chambers to the accumulator, the bypass conduit including a non-return valve configured to block flow of the fluid from the at least one chamber to the accumulator.

Assignees

• Rabhi Vianney
• MCE 5 Development

Inventors

• Bigot Sylvain
• Teyssier Benjamin
• Besson François

Classifications

• F02D2700/035

  without modifying the volume of the compression space, e.g. by changing the valve timing · CPC title

• F02D15/00 Primary

  Varying compression ratio · CPC title

• F02B75/04

  Engines with variable distances between pistons at top dead-centre positions and cylinder heads · CPC title

• F15B2201/411

  having valve means · CPC title

• F15B1/02

  Installations or systems with accumulators · CPC title