KR20130108791A

KR20130108791A - Positive crankcase ventilation valve for vehicle and controlling method thereof

Info

Publication number: KR20130108791A
Application number: KR1020120030517A
Authority: KR
Inventors: 하동현
Original assignee: 현대자동차주식회사
Priority date: 2012-03-26
Filing date: 2012-03-26
Publication date: 2013-10-07

Abstract

The present invention relates to a vehicle V-valve and a control method thereof, which can eliminate the operation noise by preventing direct contact between the valve body 110 and the armature 130 during the movement of the armature 130 according to the positive or negative pressure. Not only that, but also the durability can be improved.

Description

Vehicle V-valve and its control method {POSITIVE CRANKCASE VENTILATION VALVE FOR VEHICLE AND CONTROLLING METHOD THEREOF}

The present invention relates to a PCV valve for a vehicle and a control method thereof, and more particularly, to a PCV valve for a vehicle and a control method thereof configured to reduce shock noise more effectively through an electronic control using a force of a magnetic field.

Blow-by gas generated in the compression stroke and the expansion stroke during engine operation of the vehicle flows into the crankcase (the space formed between the cylinder block and the oil pan) through the gap between the cylinder and the piston of the engine. The blow-by gas introduced into the furnace contains components harmful to the human body, and thus is configured to be reburned through a ventilation system.

As a component of the ventilation system, there is a PCV valve (hereinafter referred to as a 'PCV valve') mounted on a passage connecting the crankcase and the intake manifold.

The PCV valve is a valve for adjusting the flow rate of the blow-by gas flowing into the intake manifold according to the negative pressure state or the static pressure state according to the operating conditions of the engine, the conventional mechanical PCV valve 10 is shown in FIG. Similarly, the valve body 11, the valve plunger 12, the first spring 13, and the second spring 14 are configured to contain negative pressure in the intake manifold according to the engine operating conditions (low RPM state, High vacuum state) Since the valve plunger 12 moves to the right in the state of the city to block the valve passage 15, the flow rate of blow-by gas becomes small, and conversely, if a static pressure occurs in the intake manifold (high RPM state, low vacuum) The valve plunger 12 moves to the left side by the force of the first spring 13 to open the valve passage 15 as shown in the drawing, and thus the flow rate of blow-by gas increases.

However, in the conventional PCV valve 10 as described above, when the valve plunger 12 moves, direct impact of the valve body 11 and the valve plunger 12 causes a large impact noise, and also easily breaks down due to rapid durability. There was a disadvantage of being broken or broken.

In order to prevent this, as shown in FIG. 2, another conventional PCV valve 20 using MR fluid has been proposed. The PCV valve 20 includes a fluid chamber 22 filled with MR fluid 21, When the valve plunger 23 is moved, the coil part 24 provided at one end of the valve plunger 23, the pressure sensor 25, the ECU 26 for controlling the current supply to the coil part 24, and the like are included. By changing the viscosity of the MR fluid 21 to exert a damping force to prevent a strong contact between the valve body 27 and the valve plunger 23, thereby reducing the impact noise and improve the durability.

However, the conventional PCV valve 20 using the MR fluid as described above is a configuration that merges the fluid and the mechanical structure together, there is a disadvantage that is not easy to implement substantially, the cost is increased by using expensive MR fluid There are disadvantages, especially since the configuration does not take into account the characteristics of the MR fluid whose viscosity changes with temperature changes.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

Republic of Korea Patent Publication No. 10-2007-0039717.

Accordingly, the present invention has been made to solve the above problems, by preventing direct contact between the valve body and the armature during the movement of the armature corresponding to the conventional valve plunger to further improve the impact noise reduction and durability improvement In particular, the purpose of the present invention is to provide a vehicle valve valve and a control method thereof in which a failure occurs and a cost is low, since it is not necessary to consider characteristics due to temperature change.

In order to achieve the above object, a vehicle V-valve valve for vehicles according to the present invention comprises: an armature installed to be movable along a valve passage formed in a valve body; One end is fixed to the valve body and the other end is fixed to the armature so that when the positive pressure occurs on the intake manifold side according to the engine operating condition, the armature is provided to the armature so that the valve passage can be kept closed. An elastic member for moving the; And fixedly installed on the inside and outside of the armature to generate a magnetic field with an applied current when the armature moves with the force of the elastic member when a positive pressure is generated on the intake manifold to generate a magnetic reaction force in the opposite direction in which the armature moves. Reaction force generation mechanism; characterized in that it comprises a.

Both ends of the valve passage are a crankcase connecting passage connected to the crankcase side and an intake manifold connecting passage connected to the intake manifold side; The armature moves toward the crankcase connecting passage by the force of the elastic member when positive pressure is generated on the intake manifold side, and when a negative pressure is generated on the intake manifold side or a current is applied to the reaction force generating mechanism. If it is, characterized in that configured to move toward the intake manifold connecting passage while winning the force of the elastic member.

One end of the crankcase connecting passage and the armature in contact with the crankcase connecting passage are each formed in a trapezoidal shape so that the valve body and the armature come into contact with each other to maintain improved airtightness through trapezoidal surface contact. It is characterized by.

The crankcase connection passage is characterized in that the inner sealing member is fixed to prevent the direct noise between the valve body and the armature to prevent impact noise and to improve the airtight performance.

The outer circumferential surface of the valve body is characterized in that the outer sealing member is fixedly installed to maintain the airtightness between the valve body and the cylinder head cover.

The reaction force generating mechanism is installed to be wound around the outer periphery of the armature coil member to generate a magnetic field when the current is applied; N pole of the permanent magnet is fixed to the interior space of the armature; And an S pole of the permanent magnet fixedly installed on an inner circumferential surface of the valve passage that is outside of the armature.

A position sensor fixed to an inner circumferential surface of the valve passage to detect a moving direction of the armature; And a controller configured to receive the signal of the position sensor to determine the positive and negative pressure states and to control the application of current to the reaction force generating mechanism.

In the control method of the vehicle PVC valve according to the present invention, the positive / negative pressure judging step of judging whether the positive pressure or the negative pressure is generated on the intake manifold side according to the movement direction of the armature located in the valve body after the engine is started. ; And applying a current to the coil member under the control of the controller so as to generate a magnetic reaction force in a direction opposite to the movement direction of the armature when a positive pressure is generated, and applying a current to block the application of current to the coil member when a negative pressure occurs. Determination step; characterized in that it comprises a.

When the armature moves toward the crankcase connecting passage connected to the crankcase side, the controller is characterized in that it determines that the positive pressure has occurred on the intake manifold side.

When the armature moves toward the intake manifold connecting passage connected to the intake manifold side, the controller determines that a negative pressure has occurred at the intake manifold side.

The magnitude of the magnetic reaction force generated when the current is applied to the coil member is smaller than the movement force of the armature.

According to the vehicle V-valve according to the present invention, it is possible to eliminate the operation noise due to the armature movement, to improve the durability as well as to further reduce the weight and cost significantly.

1 is a view of a conventional mechanical PCV valve,
2 is a view of a PCV valve using a conventional MR fluid,
3 is a view of the PCV valve according to the present invention in the negative pressure state,
4 is a cross-sectional view taken along line II of FIG. 3;
5 is a view of a PCV valve according to the present invention in a constant pressure state,
6 is a flowchart illustrating a control method of a PCV valve according to the present invention;
Figure 7 is a graph measuring the noise of the PCV valve and the conventional PCV valve according to the present invention.

Hereinafter, with reference to the accompanying drawings, a vehicle V-valve according to a preferred embodiment of the present invention and a control method thereof will be described.

The vehicle PCV valve 100 according to the present invention has a configuration including a valve body 110, an armature 130, an elastic member 140, and a reaction force generating mechanism 150 as shown in FIGS. 3 to 5.

The valve body 110 is installed by being assembled to the cylinder head cover, the outer sealing member 120 is fixed to the outer peripheral surface of the valve body 110 to maintain the airtight between the valve body 110 and the cylinder head cover It is installed.

A valve passage 111 penetrating both ends of the valve body 110 is formed inside the valve body 110, and one end of the valve passage 111 is connected to the crankcase side of the crankcase connection passage 111a. The other end of the valve passage 111 is an intake manifold connecting passage 111b connected to the intake manifold side.

The armature 130 is located in the valve passage 111 and is installed to be movable along the valve passage 111.

That is, the armature 130 moves toward the crankcase connecting passage 111a by the force of the elastic member 140 when positive pressure is generated on the intake manifold side, and a negative pressure is generated on the intake manifold side. In this case or when the current is applied to the reaction force generating mechanism 150 is configured to move toward the intake manifold connecting passage (111b) while winning the force of the elastic member 140.

In addition, the armature 130 has a structure in which the inner space 131 is empty, and the empty inner space 131 is provided with an N pole of a permanent magnet described later.

The elastic member 140 has a structure in which one end is fixed to the valve body 110 and the other end is fixed to the armature 130, that is, one end of the elastic member 140 has an intake manifold connection passage ( 111a) is fixed to the valve body 110 and the other end is a structure installed to be fixed to one end of the armature 130 toward the intake manifold connecting passage (111a).

The elastic member 140 provides the armature 130 with an elastic force so that the valve passage 111 maintains a sealed state as shown in FIG. 5 when a positive pressure occurs in the intake manifold side according to an engine operating condition. It serves to move the 130 to the crankcase connecting passage (111a).

To this end, the elastic member 140 is preferably a compression spring, but is not limited thereto.

The reaction force generating mechanism 150 is fixedly installed on the inside and outside of the armature 130 to generate a magnetic field with a current applied when the armature 130 moves with the force of the elastic member 140 when a positive pressure is generated on the intake manifold side. Thus, the armature 130 serves to generate a magnetic reaction force in the opposite direction in which the armature 130 moves, and a detailed description of the reaction force generation mechanism 150 will be given below when describing the operation of the embodiment of the present invention.

The reaction force generating mechanism 150 is installed to be wound around the outer circumference of the armature 130, the coil member 151 for generating a magnetic field upon application of current, and permanently installed in the inner space 131 of the armature 130 The N pole 152 of the magnet and the S pole 153 of the permanent magnet installed to be fixed to the inner peripheral surface of the valve passage 111 that is outside the armature 130.

Meanwhile, when the valve body 110 and the armature 130 contact each other, that is, as shown in FIG. 5, the armature 130 contacts the crankcase connection passage 111a of the valve body 110 and thus the valve passage 111. ), The crankcase connection passage 111a of one end of the armature 130 and the valve body 110 is a trapezoidal surface contact so as to maintain an improved airtight performance when closing the crankcase connection. One end of the armature 130 in contact with the passage (111a) and the crankcase connecting passage (111a) is characterized in that each cross section is formed in a trapezoidal shape (112,132).

In addition, the crankcase connection passage 111a prevents direct contact between the valve body 110 and the armature 130 to prevent shock noise and at the same time improve the airtight performance of the inner sealing member 160. ) Is fixedly installed.

The outer sealing member 120 and the inner sealing member 160 is preferably formed of rubber, but is not limited thereto.

In addition, the PCV valve 100 according to the present invention is installed to be fixed to the inner peripheral surface of the valve passage 111 to detect the movement direction of the armature 130 and the position sensor 170 The controller 180 may further include a controller 180 that determines a positive pressure and a negative pressure state by receiving a signal and simultaneously controls the application of current to the reaction force generating mechanism 150.

On the other hand, in the control method of the vehicle PCV valve according to the present invention, after the start of the engine is determined according to the direction of movement of the armature 130 located in the valve body 110, whether the positive pressure or the negative pressure is generated on the intake manifold side Negative pressure determination step; And applying a current to the coil member 151 under the control of the controller 180 so as to generate a magnetic reaction force in a direction opposite to the movement direction of the armature 130 when the positive pressure is generated, and when the negative pressure occurs, the coil Characterized in that it comprises a; current applying step of blocking the application of current to the member 151.

Here, when the armature 130 is moved toward the crankcase connection passage 111a connected to the crankcase side, the controller 180 determines that the positive pressure has occurred at the intake manifold side, and the armature 130 is the intake manifold. When the controller 180 moves to the intake manifold connecting passage 111b connected to the side, the controller 180 determines that a negative pressure is generated at the intake manifold side.

In addition, the magnitude of the magnetic reaction force generated when the current is applied to the coil member 151 is characterized in that it is smaller than the movement force of the armature 130.

Hereinafter, the operation and control of the PCV valve 100 according to the embodiment of the present invention will be described with reference to FIGS. 3 to 6.

PCV valve 100 according to the invention is based on operating in the state that the vehicle is started (ON).

The state of the PCV valve 100 of FIG. 3 is a state in which negative pressure is generated at the intake manifold side, and when negative pressure is generated, the armature 130 overcomes the force of the elastic member 140 and moves toward the intake manifold connecting passage 111b. As a result, since the valve passage 111 is in an open state, the flow rate of the blow-by gas increases.

The movement of the armature 130 is detected by the position sensor 170, the signal of the position sensor 170 is transmitted to the controller 180, the controller 180 determines the movement direction of the armature 130 At the intake manifold side, it is determined whether a negative pressure or a positive pressure is generated.

That is, when the armature 130 moves toward the intake manifold connecting passage 111b, the controller 180 determines that a negative pressure is generated at the intake manifold side, in which case the controller 180 is a coil member ( In step 151, control is performed such that no current is applied (step S1 of FIG. 6).

And, the state of the PCV valve 100 of FIG. 6 is a state in which the positive pressure is generated on the intake manifold side, and when the positive pressure is generated, the armature 130 receives both the positive pressure and the restoring force of the elastic member 140 and the crankcase connection passage ( 111a), which causes the valve passage 111 to be blocked by the armature 130, so that the flow rate of blow-by gas is reduced or blocked.

On the other hand, when the pressure on the intake manifold side is changed from the negative pressure as shown in FIG. 3 to the static pressure as shown in FIG. 5, the armature 130 moves toward the crankcase connection passage 111a as shown in FIG. 5 to crankcase connection passage 111a. Bar is to be sealed, wherein the PCV valve 100 of the present invention has a configuration to prevent the armature 130 is in direct contact with the valve body 100 in order to improve noise prevention and durability.

That is, when the inner sealing member 160 made of rubber is fixedly installed in the crankcase connecting passage 111a, the armature 130 moves toward the crankcase connecting passage 111a to seal the crankcase connecting passage 111a. The armature 130 first comes into contact with the inner sealing member 160.

Therefore, the PCV valve 100 according to the present invention is to be made to contact the inner sealing member 160 when the change from the negative pressure to the positive pressure, thereby preventing the occurrence of impact noise and improve durability. .

In addition, when the pressure on the intake manifold side is changed from negative pressure to positive pressure and at the same time the armature 130 moves toward the crankcase connection passage 111a, the controller 180 receiving the signal from the position sensor 170 receives the armature ( On the basis of the moving direction of 130, it is determined that the positive pressure is generated on the intake manifold side.

When the controller 180 determines that the positive pressure is generated as described above, the controller 180 controls the current to be applied to the coil member 151. (Step S2 of FIG. 6)

When the current is applied to the coil member 151, the magnetic reaction force (F1) against the moving force of the armature 130 moving toward the crankcase connecting passage (111a) by the force of the magnetic field according to the left hand law of Fleming This will occur.

In FIG. 5, arrow M1 is a direction of current generated when current is applied to the coil member 151, and M2 is a direction of a magnetic field moving from the N pole of the permanent magnet to the S pole.

That is, a magnetic reaction force F1 is generated to move the armature 130 in a direction opposite to the movement direction of the armature 130 moving toward the crankcase connection passage 111a. Accordingly, the armature ( 130 is to slowly move toward the crankcase connecting passage 111a to seal the valve passage 111 in contact with the inner sealing member 160.

In other words, when a positive pressure occurs on the intake manifold side, a magnetic reaction force F1 is generated that counteracts the movement force of the armature 130 moving toward the crankcase connecting passage 111a, whereby the armature 130 is cranked. Instead of moving rapidly toward the case connection passage 111a, the valve passage 111 is sealed by moving slowly, thereby preventing shock noise and improving durability.

Then, when the pressure on the intake manifold side is changed from the positive pressure to the negative pressure again, the armature 130 is changed from the state of FIG. 5 to the state of FIG. 3 again to open the valve passage 111.

Further, the PCV valve 100 according to the present invention has one end of the armature 130 and the crankcase connection passage when the armature 130 moves toward the crankcase connection passage 111a to seal the valve passage 111. As the structure 111a) makes trapezoidal surface contact, the PCV valve 100 can further improve the airtight performance of the valve passage 111 in a constant pressure state.

In addition, the PCV valve 100 according to the present invention has an advantage in that the elastic member 140 is composed of one compared to the conventional PCV valve having two springs to reduce weight and reduce cost.

In addition, the PCV valve 100 according to the present invention has an advantage that can be relatively easy to implement in a mechanical configuration that does not use a fluid whose viscosity changes in accordance with the temperature change, in particular can eliminate the disadvantage of easy failure and greatly increase the cost There is an advantage to reduce.

On the other hand, Figure 7 shows a graph of the noise measured for the conventional PCV valve and the PCV valve according to the present invention, the section A and B measured the noise at the same time as a result compared to the conventional PCV valve It can be seen that the noise of the PCV valve according to the present invention is greatly reduced.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

100-PCV Valve 110-Valve Body
120-External sealing member 130-Amateur
140-Elastic member 150-Reaction force generator
160-Internal sealing member 170-Position sensor
180-controller

Claims

Armature 130 is installed to move along the valve passage 111 formed in the valve body 110;
One end is fixed to the valve body 110 and the other end is fixed to the armature 130 so that the valve passage 111 maintains a closed state when a static pressure occurs at the intake manifold side according to engine operating conditions. An elastic member 140 for providing an elastic force to the armature 130 to move the armature 130; And
The armature 130 is fixed to the inside and outside of the armature 130 to generate a magnetic field with the current applied when the armature 130 moves with the force of the elastic member 140 when a positive pressure is generated on the intake manifold side. Reaction force generating mechanism for generating a magnetic reaction force in the opposite direction to move (150).

The method according to claim 1,
Both ends of the valve passage 111 are the crankcase connection passage 111a connected to the crankcase side and the intake manifold connection passage 111b connected to the intake manifold side;
The armature 130 moves toward the crankcase connecting passage 111a by the force of the elastic member 140 when positive pressure occurs on the intake manifold side, and when negative pressure occurs on the intake manifold side. Or when the current is applied to the reaction force generating mechanism 150, the vehicle V-valve characterized in that configured to move toward the intake manifold connecting passage (111b) while winning the force of the elastic member (140).

The method according to claim 2,
One end of the armature 130 in contact with the crankcase connection passage 111a and the crankcase connection passage 111a is formed through trapezoidal surface contact when the valve body 110 and the armature 130 come into contact with each other. Vehicle V-valve characterized in that each cross section is formed in a trapezoidal shape to maintain improved airtight performance.

The method according to claim 2,
The crankcase connection passage 111a has an inner sealing member 160 which prevents direct noise between the valve body 110 and the armature 130 to prevent shock noise and improve airtight performance. Vehicle V-valve characterized in that the fixed installation.

The method according to claim 1,
PC valves, characterized in that the outer sealing member 120 is fixed to the outer peripheral surface of the valve body 110 to maintain the airtightness between the valve body 110 and the cylinder head cover.

The method according to claim 1,
The reaction force generating mechanism 150 is installed to be wound around the outer circumference of the armature 130, the coil member (151) for generating a magnetic field when the current is applied;
An N pole 152 of a permanent magnet fixedly installed in the inner space 131 of the armature 130; And
Vehicle V-vessel, characterized in that it comprises the S pole 153 of the permanent magnet is fixed to the inner circumferential surface of the valve passage 111 that is outside the armature (130).

The method according to claim 1,
A position sensor 170 installed to be fixed to an inner circumferential surface of the valve passage 111 to detect a moving direction of the armature 130; And
And a controller (180) for controlling the application of current to the reaction force generating mechanism (150) at the same time as receiving the signal from the position sensor (170) to determine the positive and negative pressure states.

A positive / negative pressure judging step of determining whether positive pressure or negative pressure is generated on the intake manifold side according to the moving direction of the armature 130 located in the valve body 110 after the engine is started; And
When a positive pressure occurs, a current is applied to the coil member 151 under the control of the controller 180 so as to generate a magnetic reaction force in a direction opposite to the movement direction of the armature 130, and when the negative pressure occurs, the coil member And a current application determining step of cutting off the application of the current to the unit 151.

The method according to claim 8,
When the armature (130) moves toward the crankcase connecting passage (111a) connected to the crankcase side, the controller 180 determines that the positive pressure is generated on the intake manifold side.

The method according to claim 8,
When the armature 130 moves toward the intake manifold connecting passage 111b connected to the intake manifold side, the controller 180 determines that a negative pressure is generated at the intake manifold side. Way.

The method according to claim 8,
The magnitude of the magnetic reaction force generated when the current applied to the coil member (151) is smaller than the moving force of the armature (130).