FR2765630A1 - Exhaust gas recirculating valve assembly - Google Patents

Abstract

The recirculation is controlled by a dual valve with one valve controlling the total gas flow and the other controlling partial gas recirculation, into the inlet manifold. Both valves are mounted in a common block and covered by a common cover (10). The cover has a single multi-point connector (40) for the electric supplies and a single connecting port (24) for the pneumatic supply.The separate valve actions are controlled using pneumatic servo force, e.g. low pressure, with the control valves solenoid controlled. The moulded cover includes the distribution tracks for the electric control for the solenoid and the distribution ducts for the pneumatics

Description

The present invention relates to a device for

  valve, in particular exhaust gas re-injection valve

  ment, for internal combustion engines, comprising at least two valve elements actuated independently of one another by vacuum actuating devices and

  switching means housed in a common housing and

  associated with actuation devices.

State of the art.

  It is known to use reinjection valves

  exhaust gases in internal combustion engines.

  These valves are used to mix the intake air of an internal combustion engine with its exhaust gases to reduce the oxygen content of the intake air. Reducing the oxygen content of the intake air minimizes the formation of oxides

  nitrogen produced by combustion in the engine.

  Exhaust gas reinjection valves,

  known, include two valve devices actuated independently

  pending; a first device regulates the overall air flow in the valve device and the second regulates the addition of exhaust gases. The valve devices are actuated by pneumatic vacuum boxes, constituting vacuum actuators. The devices

  for this purpose are connected to a source of depres-

  if we. Actuating devices are controlled by

  switching means constituted for example by electro-

  valves. The solenoid valves regulate the application of depres-

actuation device.

  In known valve devices, both the actuating devices and the switching means

  are housed in a common housing. Each of the means of com-

  mutation is connected by an appropriate connection to the vacuum source and each of the switching means is connected

  by a connection associated with a voltage source.

  The disadvantage is that of a large number of connections for the operation of the valve device. In addition to the complexity of the assembly, there are a large number of points to be sealed.

Advantages of the invention.

  The present invention aims to remedy these drawbacks and to this end relates to a device for

  valve of the type defined above, characterized in that a neck

  housing circle includes both connecting lines for the electrical contact of the switching means and the pneumatic contacting of the actuating devices,

  these means being connected to corresponding power sources

  laying by a connection means.

  This device offers the advantage, compared to

  known solutions, to minimize the means of

  tage, connection and sealing. The fact that a housing cover comprises at the same time connection paths with an electrical contacting of the switching means and a pneumatic contacting of the actuation means, each connected by a connection to the power sources, each time there is only one connection for pneumatic contacting and only one connection for electrical contacting. The internal distributions are ensured by the connection paths integrated into the housing cover. In particular in the case of a housing cover in the form of an injected plastic part, the connection paths can be integrated during the manufacture of the

  housing cover, which avoids any additional junction

  shut up which would require additional sealing. Only one connection for the pneumatic contact and one

  connection for electrical contact. The number of drivers

  the connecting links connected to the valve device is thus also

slightly reduced.

  According to other advantageous features of the invention: * a connection module is integrated in the cover of

  housing, this module ensuring both the electrical connections

that and pneumatic.

  * the pneumatic connection is connected to a vacuum source by a connection and connection points for the

  connection of actuating devices.

  * the connection points are formed by nozzles of

  connection integrating the switching means.

  * the electrical connection is formed by power lines

  integrated in the connection module.

  * the power lines are integrated in the module

  connection in that the contact sheets are positioned

  born during the injection used to manufacture the module

of connection.

  * the connection module is a part injected in material

plastic.

  * the housing cover is detachably connected to the

  valve device by at least one hooking means.

  Drawings. The present invention will be described below in more detail with the aid of an exemplary embodiment

  shown schematically in the accompanying drawings in the-

  which: - Figure 1 is a perspective view of a housing cover, - Figure 2 is a top view of the housing cover of Figure 1, - Figure 3 is a side view of the housing cover

box of figure 1.

  Description of the exemplary embodiment.

  The perspective view of Figure 1 shows a housing cover 10 of a single exhaust gas re-injection valve, itself not shown. The housing cover 10 includes a first cover segment 12 and a second cover segment 14. The cover segments 12

  and 14 are in the form of pots and are placed on installations

  actuation in the form of pneumatic vacuum boxes

  valve device. The construction and operation of the actuating devices will not

  detailed in the context of this description because it

  these are generally known means.

  The cover segments 12 and 14 are covered

  green by a closure module 16 which comprises, on the one hand, a pneumatic connection 18, and, on the other hand, an electrical connection 20. The pneumatic connection 18 is constituted by a tubular element 22 having a connection with a source to depression not shown. The element 22 comprises integrated connection points 26 (FIG. 3) by which the pneumatic vacuum boxes are connected to the pneumatic connection 18. Nozzles 28 are provided; they are integral with the tubular element 22 and open into the segments of

cover 12 and 14.

  The nozzles 28 receive at the same time a shutter member (not shown) of a switching means in the form of a solenoid valve 34 (FIG. 2) for the devices

  actuation. The obturation unit communicates

  tion between the tubular element 22 and the cover segments

  key 12, 14 for closing and opening. The solenoid valves 34 include electrical contacts 36 which come into contact with electrical lines 38 integrated into the connection module 16. In the example shown, a total of three electrical lines 38 are provided, by means of which the two solenoid valves 34 are controlled. An electrical line 38 is provided to supply a control signal to each of the solenoid valves; the third power line 38 is the

  common ground line of the solenoid valves 34. The electric lines

  triques 38 exit the connection module 16 via a connector

nector 40.

  The electrical lines 38 consist for example of integrated contact sheets 42, at the time of injection of the connection module 16, according to the diagram of

  connection, in the form of pre-

  assemblies. This eliminates the need for additional resources to

  electrical insulation and / or waterproofing. The electric lines

  triques 38 leave the connection module 16 only at the contact points of the contact connector 40 and

  connection contacts 36 of the solenoid valves 34.

  The housing cover 10 with its module

  connection 16 allows the two devices to be connected simultaneously

  actuating devices of the valve device to a vacuum source and to a voltage source; only one connection point is necessary for the vacuum (connection

  24) and a single connection point for the electrical contact

  (connector 40). In the case of gate valve devices

  several actuating devices and / or switching means

  tion, the housing cover 10 is developed in a cor-

  corresponding so that regardless of the number of actuating devices and / or switching means, it suffices each time to have a connection for the vacuum source and a connection for the voltage source. The housing cover 10 also includes nozzles 48 to which a reference air source (atmospheric air) can be connected for the actuating devices. As clearly shown in Figures 1 and 3, the housing cover 10 can be connected to the housing of the exhaust gas reinjection valve by means

  attachment 44 to ensure mechanical strength. Windows

  very hanging 46 are provided for this purpose through the-

  what can come from the corresponding hooking nozzles

in the housing.

  This provides a removable connection between the housing cover 10 and the integrated connection module 16 and the housing. By simply hanging the housing cover 10, the device can be completed in a simple manner

  valve. Overall, we thus obtain, with simple means,

  ples, an injected plastic part which is advantageously manufactured in series, with a connection module 16 comprising both the electrical and pneumatic contact means for the valve device. The compact construction and the fact that the housing cover 10 consists of a single piece with an integrated connection module 16

  eliminates complicated sealing means.

Claims (7)

R E V E N D I C A T I O N S   1) Valve device, in particular an exhaust gas re-injection valve, for internal combustion engines,   comprising at least two independently actuated valve elements   each of them by vacuum actuators and switching means housed in a common housing and associated with the actuators, characterized in that a housing cover (10) has both connecting lines for the electrical contact of the switching means (34) and the pneumatic contacting of the actuating devices, these means being connected to corresponding power sources by a connection means (24, 40).   2) valve device according to claim 1, characterized in that a connection module (16) is integrated in the housing cover (10), this module ensuring both the connections   electric and pneumatic (18, 20).   3) Valve device according to any one of the claims.   1 and 2, characterized in that   the pneumatic link (18) is connected to a vacuum source   via a connection (24) and connection points (26)   for the connection of actuating devices.   4) valve device according to claim 3, characterized in that the connection points (26) are constituted by nozzles   connection (28) integrating the switching means (34).    ) Valve device according to any one of the preceding claims, characterized in that   the electrical connection (20) is formed by electrical lines   ques (38) integrated in the connection module (16).   6) A valve device according to claim 5, characterized in that the electrical lines (38) are integrated in the connection module (16) in that the contact sheets (42) are positioned during the injection serving to the manufacture of connection module (16).   7) valve device according to claim 2, characterized in that   the connection module (16) is a part injected in ma- plastic.   8) Valve device according to any one of the claims.   above, characterized in that the housing cover (10) is detachably connected to the   valve device by at least one hooking means (44).