CN107542605A - Triple valve and vehicle for D-EGR systems - Google Patents

Abstract

The invention provides a kind of triple valve and vehicle for D egr systems, triple valve includes：Valve body, valve body have air admission hole, first row stomata and second row stomata, and air admission hole connects with the exhaust outlet of any one cylinder in engine, and first row stomata connects with gas handling system, and second row stomata connects with gas extraction system；Switching device, switching device are arranged in valve body；Drive device, drive device are arranged for driving switching device axial movement to turn on air admission hole and first row stomata or air admission hole and second row stomata.So in engine cold-start, switching device can turn on air admission hole and second row stomata, so that the waste gas in in-engine multiple cylinders all flows to catalyst converter, catalyst converter can be caused to be rapidly achieved operating temperature, and then the discharge of pernicious gas can be reduced, the environmental-protecting performance of vehicle can be improved.

Description

Three-way valve for D-EGR system and vehicle

technical field

The invention relates to the technical field of vehicles, in particular to a three-way valve for a D-EGR system and a vehicle with the three-way valve.

Background technique

The research and development idea of D-EGR (Dedicated Exhaust Gas Recirculation-specialized exhaust gas recirculation) comes from the Southwest Research Institute of the United States. It is envisaged that only a single cylinder is used to participate in the exhaust gas recirculation process, so as to reduce the redundant consumption in the exhaust gas recirculation process energy. During the operation of the engine, the exhaust gas in only one cylinder enters the EGR pipeline and participates in the exhaust cycle after passing through the combustion chamber, which means that this system will provide a constant 25% exhaust gas recirculation rate (referred to as the EGR rate ). Because it can maintain a relatively high and stable EGR rate, the engine can work stably at a higher compression ratio, so D-EGR can improve engine fuel economy while reducing emissions.

But D-EGR has an obvious disadvantage, that is, the emission is very poor at cold start, the main reason is that the exhaust gas volume is reduced by 25%, the catalytic converter cannot reach the working temperature in a short time, and the uncatalyzed exhaust gas is directly discharged into the atmosphere, So resulting in poor emissions. How to improve cold start emission is a problem that D-EGR engine must solve.

Contents of the invention

In view of this, the present invention aims to propose a three-way valve for the D-EGR system to solve the problem of poor emission when the engine is cold started.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A three-way valve for a D-EGR system, the vehicle includes an engine, an intake system and an exhaust system, the three-way valve includes: a valve body, the valve body has an intake hole, a first exhaust hole and a second exhaust hole, the air intake hole communicates with the exhaust port of any cylinder in the engine, the first exhaust hole communicates with the intake system, and the second exhaust hole communicated with the exhaust system; a switching device, the switching device is arranged in the valve body; a driving device, the driving device is configured to drive the switching device to move axially so as to conduct the air intake hole and The first exhaust hole or the air intake hole and the second exhaust hole.

Further, the driving device includes: a driving member and a rod body, the driving member drives the rod body to move along the axial direction of the rod body, the rod body extends into the valve body, and the switching device is installed on the rod body superior.

Further, the valve body is provided with a boss, and a through hole is arranged in the boss, and the rod body extends into the valve body through the through hole.

Further, the switching device includes: a first gasket and a second gasket, the first gasket and the second gasket are spaced apart from each other on the rod body, and the first gasket is suitable for sealing The first vent hole and the second gasket are suitable for sealing the second vent hole.

Further, the edge of the first gasket has a first guiding slope, and the edge of the second sealing gasket has a second guiding slope.

Further, the valve body includes: a first valve body and a second valve body, the first valve body has the air inlet hole and the second exhaust hole, and the second valve body has the first valve body The exhaust hole, the first valve body and the second valve body are fixedly connected.

Further, the first valve body is generally V-shaped, and the second valve body is generally linear.

Further, the included angle between the air inlet hole and the first air outlet hole is greater than the angle between the air inlet hole and the second air outlet hole, and is greater than 90°.

Further, both the valve body and the switching device are made of alloy stainless steel.

Compared with the prior art, the three-way valve of the present invention has the following advantages:

According to the three-way valve used in the D-EGR system of the present invention, the three-way valve can connect the exhaust port and the intake system of any cylinder of the engine or the exhaust port and the exhaust gas of any cylinder of the engine. system, so that all the exhaust gas in the cylinder can flow to the catalytic converter of the exhaust system when the vehicle is in the cold start condition, so that the catalytic converter can quickly reach the working temperature, thereby reducing the emission of harmful gases and improving the environmental protection performance of the vehicle. During the normal running of the vehicle, the exhaust gas in one cylinder can enter the combustion chamber in each cylinder through the intake system for combustion, thereby reducing the nitrogen oxide content in the exhaust gas and improving the environmental performance and fuel economy of the vehicle.

Another object of the invention is to propose a vehicle.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A vehicle includes the above-mentioned three-way valve.

According to the vehicle of the present invention, including the above-mentioned three-way valve for the D-EGR system, due to the above-mentioned three-way valve for the D-EGR system, the vehicle emits less harmful gas during cold start, and nitrogen gas during normal operation. Oxygen emissions are low, which can improve environmental performance and fuel economy.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the connection diagram of three-way valve described in the embodiment of the present invention and engine, intake system and exhaust system;

Fig. 2 is a sectional view of the three-way valve described in the embodiment of the present invention;

Fig. 3 is another cross-sectional view of the three-way valve according to the embodiment of the present invention.

Explanation of reference signs:

Three-way valve 100; engine 200; cylinder 210; intake system 300; exhaust system 400;

Valve body 10; air inlet a; first exhaust hole b; second exhaust hole c; boss 11; first valve body 12; second valve body 13;

Switching device 20; first sealing gasket 21; first guiding inclined surface 211; second sealing gasket 22; second guiding inclined surface 221;

Drive device 30 ; drive member 31 ; rod body 32 .

detailed description

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

The three-way valve 100 of the embodiment of the present invention will be described in detail below with reference to the accompanying drawings and embodiments. The three-way valve 100 can be applied to the D-EGR system of a vehicle. For example, as shown in FIG. 1 , the vehicle includes an engine 200 , an intake system 300 and an exhaust system 400, the three-way valve 100 is connected between the engine 200, the intake system 300 and the exhaust system 400, so as to control the direction of gas flow.

As shown in FIGS. 2 and 3 , a three-way valve 100 for a D-EGR system according to an embodiment of the present invention may include: a valve body 10 , a switching device 20 and a driving device 30 , the valve body 10 has an air inlet a, The first exhaust hole b and the second exhaust hole c, as shown in FIG. The second exhaust hole c communicates with the exhaust system 400 . Wherein, the engine 200 may include a plurality of cylinders 210, the intake port a is only in communication with the exhaust port of one cylinder 210 in the plurality of cylinders 210, preferably, the cylinder 210 is located on one side of other cylinders 210, so that other cylinders The exhaust gas of 210 can flow to the catalytic converter of the exhaust system 400 through the exhaust manifold, and after being catalyzed by the catalyst in the catalytic converter, the exhaust gas is discharged into the atmosphere, and the exhaust port of the cylinder 210 is connected with the intake port of the three-way valve 100 The hole a is connected, so that the exhaust gas of the cylinder 210 can be discharged to the intake system 300 through the first exhaust hole b or discharged to the catalyst of the exhaust system 400 through the second exhaust hole c.

As shown in Figures 2 and 3, the switching device 20 is disposed in the valve body 10, and the driving device 30 is configured to drive the switching device 20 to move axially so as to conduct the air inlet a and the first exhaust hole b or the air inlet a and the second vent c. The axial direction is the axial direction of the driving device 30 , which will be described in detail below. It can be understood that the driving device 30 can drive the switching device 20 to move axially, and the switching device 20 can seal the second exhaust hole c. At this time, the switching device 20 can conduct the air inlet a and the first exhaust hole b, from The exhaust gas entering the cylinder 210 through the intake hole a can be discharged into the pipeline of the intake system 300 through the first exhaust hole b, and the exhaust gas is mixed with other gases and enters each cylinder 210 to participate in the combustion of the combustion chamber. This switching mode can be applied to the normal driving process of the vehicle, so that the nitrogen oxides in the exhaust gas emitted by the vehicle are significantly reduced, thereby improving the environmental protection performance and fuel economy of the vehicle.

The switching device 20 can seal the first exhaust hole b. At this time, the switching device 20 can connect the intake hole a and the second exhaust hole c, and the exhaust gas in the cylinder 210 taken in from the intake hole a can pass through the second row The air hole c is discharged into the catalytic converter of the exhaust system 400. This switching mode can be applied to the cold start condition of the vehicle, so that all the exhaust gas in the multiple cylinders 210 is discharged to the catalytic converter, so that the catalytic converter can quickly reach the working temperature. The emission of harmful gas can be avoided, and the environmental protection performance of the vehicle can be improved.

As shown in Fig. 2 and Fig. 3, the driving device 30 may include: a driving member 31 and a rod body 32, the driving member 31 is connected to the rod body 32, and the driving member 31 drives the rod body 32 to move along the axial direction of the rod body 32, the above-mentioned driving device 30 The axial direction of the rod body 32 is the axial direction of the rod body 32 , the rod body 32 extends into the valve body 10 , and the switching device 20 is installed on the rod body 32 . Thus, the driving member 31 can drive the rod body 32 to move along the length direction of the rod body 32 (ie, the axial direction), so that the switching device 20 can move axially along with the rod body 32 . Wherein, the driving member 31 may be an electromagnetic driver.

Specifically, as shown in FIG. 2 and FIG. 3 , a boss 11 may be provided on the valve body 10 , and a through hole is arranged in the boss 11 , and the rod body 32 extends into the valve body 10 through the through hole. Wherein the through hole is closely matched with the rod body 32, so that the leakage of exhaust gas can be avoided. Moreover, the boss 11 can improve the structural strength of the valve body 10 at least to a certain extent.

As shown in Figures 2 and 3, the switching device 20 may include: a first gasket 21 and a second gasket 22, the first gasket 21 and the second gasket 22 are spaced apart on the rod body 32, the first gasket 21 is suitable for sealing the first vent hole b, and the second gasket 22 is suitable for sealing the second vent hole c. By arranging the first sealing pad 21 and the second sealing pad 22, the moving stroke of the rod body 32 can be shortened at least to a certain extent, so that the switching device 20 can be switched rapidly, the three-way valve 100 can be responsive, and the electromagnetic driver can be reduced. Moving the stroke burden can improve the working reliability of the electromagnetic drive.

Wherein, when the first gasket 21 seals the first exhaust hole b, the vehicle is in a cold start condition, and at this time the exhaust gas pressure is relatively small, so the exhaust gas leakage between the through hole and the rod body 32 is very small. When the gasket 22 seals the second exhaust hole c, the vehicle is in a normal running state, and the exhaust gas pressure is relatively high at this time, but the through hole and the exhaust gas are isolated by the second sealing gasket 22, so that no exhaust gas leaks.

Optionally, as shown in FIGS. 2 and 3 , the edge of the first gasket 21 may have a first guiding slope 211 , and the edge of the second sealing gasket 22 may have a second guiding slope 221 . The first guide slope 211 can facilitate the first gasket 21 to seal the first exhaust hole b, and can improve the sealing reliability of the first gasket 21 to the first exhaust hole b, and the second guide slope 221 can facilitate the second sealing The gasket 22 seals the second vent hole c, and can improve the sealing reliability of the second gasket 22 to the second vent hole c.

According to a specific embodiment of the present invention, as shown in Figure 2 and Figure 3, the valve body 10 may include: a first valve body 12 and a second valve body 13, the first valve body 12 has an air inlet a and a second valve body The exhaust hole c, the second valve body 13 has a first exhaust hole b, and the first valve body 12 and the second valve body 13 are fixedly connected. The first valve body 12 and the second valve body 13 can be connected by flange faces, and the flange faces can be fixedly connected by bolts. During the assembly process, the rod body 32 and the switching device 20 can extend into the first valve body 12, and the second valve body 13 is fixedly connected with the first valve body 12 after the rod body 32 and the switching device 20 are placed, so that the valve body can 10 has a reasonable design, which can improve the assembly efficiency of the three-way valve 100. As shown in FIGS. 2 and 3 , the first valve body 12 may be generally V-shaped, and the second valve body 13 may be generally linear. In this way, the overall structure of the valve body 10 can be simplified, the production difficulty of the valve body 10 can be reduced, and the production efficiency of the valve body 10 can be improved.

Preferably, as shown in Figure 2 and Figure 3, the angle between the air inlet a and the first air outlet b can be greater than the angle between the air inlet a and the second air outlet c, and greater than 90 °. Because the vehicle is in a normal running state, the time for the second gasket 22 to seal the second exhaust hole c is longer, in other words, the communication time between the air inlet a and the first exhaust hole b is longer. Reasonably setting the angle between the intake hole a and the first exhaust hole b can better reduce the flow resistance of the exhaust gas, thereby improving the smoothness of the exhaust gas flow.

In addition, it should be noted that the three-way valve 100 can be directly installed on the engine 200. Due to the high exhaust gas temperature, the exhaust gas temperature of a diesel engine is close to 800°C, and the exhaust gas temperature of a gasoline engine is close to 1000°C. Therefore, the three-way valve 100 needs to be able to withstand high temperatures. , The valve body 10 and the switching device 20 may both be made of high temperature resistant alloy stainless steel.

According to the three-way valve 100 for the D-EGR system of the embodiment of the present invention, the three-way valve 100 can be connected to the exhaust port of any cylinder 210 of the engine 200 and the intake system 300 or to be connected to any one of the engine 200 The exhaust port of the cylinder 210 and the exhaust system 400 can make the exhaust gas in the cylinder 210 all flow to the catalytic converter of the exhaust system 400 when the vehicle is in a cold start condition, so that the catalytic converter can quickly reach the working temperature, thereby reducing harmful The emission of gas can improve the environmental protection performance of the vehicle, and during the normal running of the vehicle, the exhaust gas in a cylinder 210 can pass through the intake system 300 and then enter the combustion chamber in each cylinder 210 for combustion, thereby reducing the nitrogen content in the exhaust gas. The oxide content can improve the environmental protection performance and fuel economy of the vehicle.

According to the vehicle of the embodiment of the present invention, including the three-way valve 100 for the D-EGR system of the above-mentioned embodiment, due to the three-way valve 100 for the D-EGR system of the above-mentioned embodiment, the harmful gas is released when the vehicle is cold started. Less emissions, less nitrogen oxide emissions during normal work, which can improve environmental performance and fuel economy.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. A kind of 1. triple valve (100) for D-EGR systems, it is characterised in that the vehicle include engine (200), Gas handling system (300) and gas extraction system (400), the triple valve (100) include：

   Valve body (10), the valve body (10) have air admission hole (a), first row stomata (b) and second row stomata (c), institute The exhaust outlet that air admission hole (a) is stated with any one cylinder (210) in the engine (200) connects, the first row Stomata (b) connects with the gas handling system (300), and the second row stomata (c) connects with the gas extraction system (400)；

   Switching device (20), the switching device (20) are arranged in the valve body (10)；

   Drive device (30), the drive device (30) be arranged for driving the switching device (20) axial movement with Turn on the air admission hole (a) and the first row stomata (b) or the air admission hole (a) and the second row stomata (c).
2. 2. the triple valve (100) according to claim 1 for D-EGR systems, it is characterised in that the driving dress Putting (30) includes：Actuator (31) and the body of rod (32), the actuator (31) drive the body of rod (32) along described The axial movement of the body of rod (32), the body of rod (32) are stretched into the valve body (10), switching device (20) installation On the body of rod (32).
3. 3. the triple valve (100) according to claim 2 for D-EGR systems, it is characterised in that the valve body (10) On be provided with boss (11), is provided with through hole in the boss (11), the body of rod (32) stretches into institute through the through hole State in valve body (10).
4. 4. the triple valve (100) according to claim 2 for D-EGR systems, it is characterised in that the switching dress Putting (20) includes：First sealing gasket (21) and the second sealing gasket (22), first sealing gasket (21) and described second Sealing gasket (22) is spaced apart on the body of rod (32) and set, and first sealing gasket (21) is suitable to seal the first row Stomata (b), second sealing gasket (22) are suitable to seal the second row stomata (c).
5. 5. the triple valve (100) according to claim 4 for D-EGR systems, it is characterised in that described first is close The edge of packing (21) has the first guiding surface (211), and the edge of second sealing gasket (22) has second to be oriented to tiltedly Face (221).
6. 6. the triple valve (100) according to claim 1 for D-EGR systems, it is characterised in that the valve body (10) Including：First valve body (12) and the second valve body (13), there is the air admission hole (a) and the on first valve body (12) Two steam vents (c), there is first row stomata (b), first valve body (12) and described on second valve body (13) Two valve bodies (13) are fixedly connected.
7. 7. the triple valve (100) according to claim 6 for D-EGR systems, it is characterised in that first valve Body (12) generally V-shaped, the generally straight shape of second valve body (13).
8. 8. the triple valve (100) according to claim 1 for D-EGR systems, it is characterised in that the air admission hole (a) angle between the first row stomata (b) is more than between the air admission hole (a) and the second row stomata (c) Angle, and more than 90 °.
9. 9. the triple valve (100) according to claim 1 for D-EGR systems, it is characterised in that the valve body (10), The switching device (20) is made by stainless steel alloy material.
10. 10. a kind of vehicle, it is characterised in that including being used for D-EGR systems according to any one of claim 1-9 Triple valve (100).