KR101294439B1 - a variable charge motion valve control device for gasoline direct injection engines - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable charge motion valve control device for a gasoline direct injection engine. In particular, fuel wall wetting due to improved combustion stability and flow rate due to tumble is started and started immediately after a gasoline multi point injection (MPI) engine. It is an operation mechanism for operating VCM valves (Variable Charge Motion Valves) for the purpose of improving initial start-up and reducing emissions by reducing the wetting, and it uses the problems of the existing driving motor and the negative pressure generated from the surge tank. Compensate for the disadvantages of the case to reduce the manufacturing cost by operating the VCM valve mechanically, and at the same time to operate the VCM valve by the mechanical operation using the back electromotive force at the start and start-up when the negative pressure is not sufficiently formed Direct gasoline dispense for simplified control It relates to a variable charge motion control valve apparatus for an engine.

Gasoline Direct Injection, GDI, VCM Valve

Description

Variable charge motion valve control device for gasoline direct injection engines

The present invention relates to a VCM valve for the purpose of improving initial startability and reducing emissions by starting and immediately after starting a gasoline multi-point injection (MPI) engine by improving combustion stability due to tumble and reducing fuel wall wetting due to increased flow speed. (Variable Charge Motion Valve) It is an operation mechanism for operating the mechanism, which compensates the problems of using the existing drive motor and the disadvantage of using the negative pressure generated from the surge tank to rotate the rotating plate connected to the rotating shaft By operating the VCM valve, the production cost is reduced, and at the same time, the gasoline can be easily controlled by allowing the VCM valve to be operated by mechanical operation using a counter electromotive force at the start and the initial stage when the negative pressure is not sufficiently formed. Variable Charge Motion Valve Control Station for Direct Injection Engines Relate to.

In general, gasoline direct injection (GDI) engines in which only air is sucked into the combustion chamber and fuel is injected directly into the combustion chamber by an electronically precisely controlled injector. Of course, it is possible to form a stratified mixer to achieve high power and low fuel consumption simultaneously.

In other words, the gasoline direct injection engine has three areas: theoretical air fuel ratio, lean driving zone and ultra-lean driving zone. Ideally, only the ultra-lean driving zone is pursued, but when the actual vehicle speed is below a certain level and the water temperature is below a certain range, For stability, the theoretical air-fuel ratio operation should be maintained, and a lean driving region should be made between the theoretical air-fuel ratio region and the ultra-thin operation region to minimize the impact of frequent round trips between the two regions.

On the other hand, the Electronic Management System for Multi Point Injection (hereinafter referred to as 'MPI') is referred to as a VCM valve (Variable Charge Motion Valve; referred to as 'CMS'). However, the gasoline direct injection engine (GDI) electronic control system (EMS) should use a VCM valve to control the degree of intake flow as fuel level control through the injector.

Here, the VCM valve is defined as a name collectively called a swirl control valve (SCV) or a tumble control valve (MCV) for supplying intake flow to the combustion chamber in a swirl or tumble type.

In other words, the VCM valve in the MPI engine is selectively used in the lean burn engine, etc. as needed, and its operating level is only two stages of open / close, but the VCM valve in the GDI engine is used to enhance proper intake flow during ultra-thin operation. The control of the VCM valve must be controlled in detail by dividing the opening and closing into a plurality of stages.

For this reason, it is necessary to create a proper flow in ultra-thin operation because it has a value that depends on the load and speed of the engine.

In particular, the VCM valve (in case of SCV) control device of the GDI engine according to the prior art is connected to a drive motor installed on the one side of the intake manifold, the rotary shaft is installed in the intake manifold, The SCV is mounted on the rotary shaft, and the drive motor is operated by the control signal from the ECU according to the engine speed and the opening amount signal of the accelerator pedal to open and close the SCV to supply the flow of intake air to the combustion chamber as a swirl type.

By the way, the VCM valve control apparatus of the GDI engine having the above-described configuration uses an expensive drive motor composed of a DC motor to operate the VCM valve, thereby increasing the manufacturing cost and precisely controlling the operation of the drive motor. There are problems such as complicated control logic.

Therefore, in recent years, the negative pressure generated from the surge tank is accumulated to mechanically operate the VCM valve according to the operating conditions of the engine, thereby reducing the manufacturing cost, and at the same time, the VCM valve can be operated by mechanical operation, thereby simplifying the control. The VCM valve control device of the GDI engine has been proposed to achieve this.

However, as mentioned above, the VCM valve control device of the recently proposed GDI engine is only two stages of opening and closing immediately after starting and starting, but it uses an expensive driving motor composed of a DC motor to operate the VCM valve. In addition to the cause of the rise, the control logic for precisely controlling the operation of the driving motor is complicated.

The present invention has been made to solve the problems of the prior art,

By controlling the amount of rotation of the rotating plate connected to the rotating shaft by accumulating the negative pressure generated from the surge tank, the VCM valve can be operated according to the operating conditions of the engine, thereby reducing the manufacturing cost and simultaneously operating the VCM valve by mechanical operation. It is an object of the present invention to provide a variable charge motion valve control device for a gasoline direct injection engine, which enables simple control.

The present invention for solving the above problems is provided through a port of the intake manifold, the rotating shaft is rotated during external operation, the rotary plate is formed on a portion protruding to the outside of the intake manifold, the rotary plate rotates, A VCM valve mounted on the rotating shaft in the port of the intake manifold and rotating together with the rotating shaft to open and close the inside of the port, and connected to the rotating plate to control the rotation state of the rotating plate so that the inside of the port is opened through the VCM valve. A variable charge motion valve control device for a gasoline direct injection engine including an automatic opening and closing means is provided.

The operation means is formed on one side of the surge tank connected to the intake manifold and is supplied with a negative pressure of a negative pressure chamber that accumulates negative pressure generated in the intake manifold to rotate the rotating plate connected to the VCM valve by a predetermined rotational angle. In order to maintain the opening and closing state of the VCM valve is formed on the outer side of the rotating plate and the rotating plate connected to the rotating plate is characterized in that it consists of a rotating intermittent section.

The rotating part is connected to an operating rod hinged to the rotating plate and operated by negative pressure to rotate the operating rod along an elliptic trajectory to induce a negative pressure actuator to induce rotation of the rotating plate, and a negative pressure pipe connecting the negative pressure chamber and the negative pressure actuator. And a control valve which is mounted on one side of the phase to allow the negative pressure or atmospheric pressure to be selectively supplied to the negative pressure actuator according to the control signal, and an ECU to output the control signal to the control valve according to an external signal. It is done.

The rotating interrupting portion is formed in proximity to the rotating plate and is opened in the rotating plate direction, a plunger provided inside the housing and moving forward and backward in accordance with a current flow direction of an external power source, and a circumference of the plunger for movement of the plunger. Mounted on the inner or outer circumferential surface of the housing corresponding to the power coil for guiding the flow of current, and recessed in a side portion corresponding to the plunger in a position corresponding to the open or closed state of the VCM valve Characterized in that it comprises a receiving groove for receiving the plunger advanced to the outside of the housing.

The housing is preferably provided with a return spring therein to maintain a force pushing the plunger toward the rotating plate.

The rotating plate is provided with a tension spring to guide the return to the original position when the rotation in the initial state, the tension spring is characterized in that the one end is connected to the outside of the intake manifold and the other end to the rotating plate.

The variable charge motion valve control apparatus of the gasoline direct injection engine according to the present invention configured as described above

The negative pressure generated from the surge tank is accumulated in a separate negative pressure chamber, and by operating the negative pressure actuator using the negative pressure actuator, the VCM valve is rotated in accordance with the operating conditions of the engine. There is an effect that can be reduced, and at the same time there is an effect that the control is simple by operating the VCM valve by mechanical operation.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a variable charge motion valve control apparatus of a gasoline direct injection engine according to a preferred embodiment of the present invention, Figures 2a and 2b is a pre-start or VCM valve opening state according to a preferred embodiment of the present invention 3A and 3B are diagrams illustrating an operating state of the rotating plate of the rotating plate showing the VCM valve opening state at start-up according to a preferred embodiment of the present invention.

As shown in FIG. 1, the variable charge motion valve control apparatus of a gasoline direct injection engine according to an exemplary embodiment of the present invention includes an intake manifold 10, a rotation shaft 20, a rotating plate 30, and a VCM valve 40. And operating means 100.

The intake manifold 10 forms a plurality of ports 12, and the rotation shaft 20 is rotatably inserted into each port 12 at the same time.

The rotating shaft 20 is rotated by an external operation such as a drive motor.

In addition, a VCM valve 40 is provided around the rotation shaft 20 located in each port 12.

The VCM valve 40 is provided to be rotated in the same direction and the same rotational speed with the rotation shaft 20.

In particular, the VCM valve 40 is formed in a plate shape serves to open and close each port 12 in more detail in the intake manifold 10.

In addition, the rotary shaft 20 is protruded to the outside of the outermost port 12 of the intake manifold 10, the rotary plate 30 is formed on the protruding portion of the rotary shaft 20.

The rotating plate 30 is provided to be rotated in the same direction and the same rotational speed as the rotating shaft 20.

On the other hand, the operating means 100 is connected to the rotating plate 30 to control the rotation state of the rotating plate 30 to operate to automatically open and close the port 12 inside the VCM valve 40.

That is, the operating means 100 is constrained to maintain the rotated state while rotating the rotating plate 30 in one direction or the other direction within a predetermined range.

At this time, since the rotating plate 30 is integrally connected with the rotating shaft 20 and the VCM valve 40, the rotation plate 30 is induced to open and close the port 12.

In particular, the actuating means 100 is formed on one side of the surge tank 110 connected to the intake manifold 10 to the negative pressure of the negative pressure chamber 120 to accumulate the negative pressure generated in the intake manifold 10. The opening and closing state of the VCM valve 40 is formed on the outer side of the rotating part 130 and the rotating plate 30 connected to the rotating plate 30 to rotate the rotating plate 30 connected to the VCM valve 40 by a predetermined rotation angle In order to maintain the rotation plate is made of a rotation control unit 140 to control the rotation of the 30.

That is, the rotating unit 130 controls the rotating plate 30 to reciprocately rotate within the set range by using the negative pressure of the negative pressure chamber 120, and the rotating control unit 140 rotates the rotating plate 30. It is responsible for constraining and unconstraining the state.

On the other hand, the rotating unit 130 is composed of a negative pressure actuator 132, a control valve 134 and the two oils (136, hereinafter, "ECU").

The negative pressure actuator 132 is connected to the operating rod 133 hinged to the rotating plate 30 to operate by the negative pressure to induce rotation of the rotating plate 30 by rotating the operating rod 133 along the arc trajectory. do.

At this time, the operation rod 133 hinges one end to the edge of the rotary plate 30, and connects the other end to the negative pressure actuator 132.

In addition, the negative pressure actuator 132 is preferably fixedly connected to the intake manifold 10.

In addition, the negative pressure actuator 132 is preferably made of a diaphragm operated by negative pressure.

In particular, one side of the surge tank 110 is connected to the intake manifold 10 is equipped with a negative pressure chamber 120 for accumulating the negative pressure generated in the intake manifold 10, wherein, the surge tank 110 and Between the negative pressure chambers 120, when the pressure in the surge tank 110 is more than the set negative pressure (about -0.5 bar), a check valve 115 is set is set so that the elastic modulus closes.

Therefore, if the negative pressure is largely applied to the surge tank 110 (ie, less than -0.5 bar) at the start of the engine or in the idle or low load operating region, the check valve 115 opens to the negative pressure in the negative pressure chamber 120. It accumulates.

The control valve 134 is mounted on one side of the negative pressure line 135 connecting the negative pressure chamber 120 and the negative pressure actuator 132 to selectively supply negative pressure or atmospheric pressure to the negative pressure actuator 132 according to a control signal. It plays a role.

At this time, the control valve 134 is preferably composed of a negative pressure chamber 120, a negative pressure actuator 132 and a three-way solenoid valve connected to the atmosphere.

In addition, the ECU 136 outputs a control signal to the control valve 134 according to an external signal.

Accordingly, the negative pressure actuator 132 receives the negative pressure from the negative pressure chamber 120 to reciprocate the operating rod 133 along the arc trajectory, and the rotating plate 30 is rotated by the movement of the operating rod 133. It is possible to reciprocate by an angle.

On the other hand, the rotation control unit 140 is composed of a housing 141, plunger 142, power coil 143, receiving groove 144 and the return spring 145.

The housing 141 is fixedly installed on any fixed body to be close to the rotating plate 30.

The housing 141 is opened only in the direction of the rotating plate 30.

In addition, the plunger 142 may be inserted into the housing 141 to move forward and backward along the axial direction of the housing 141.

In particular, the plunger 142 is moved forward and backward in accordance with the current flow direction of the external power source.

In addition, the power coil 143 is mounted on the inner or outer peripheral surface of the housing 141 corresponding to the circumference of the plunger 142 to move the plunger 142 to guide the flow of current.

The accommodating groove 144 is recessed at a side portion corresponding to the plunger 142 in a straight line at a position corresponding to an open state or a closed state of the VCM valve 40, and the plunger is advanced to the outside of the housing 141 ( The housing 142 serves to prevent any rotation of the rotating plate 30.

In particular, a connection terminal (not shown) is provided inside the receiving groove 144 to generate a signal when contacting the plunger 142.

In addition, the return spring 145 is provided inside the housing 141 to maintain a force pushing the plunger 142 toward the rotary plate 30.

At this time, the rotating plate 30 is provided with a tension spring 150 to guide the return to the original position when the rotation in the initial state.

That is, the tension spring 150 connects one end to the outside of the intake manifold 10 and the other end to the rotating plate 30 to return the rotating plate 30 to the original position when the rotating plate 30 is rotated in an initial state. It will generate a force to recover.

At this time, the return spring 145 and the tension spring 150 is assumed to be a coil spring.

The operating state of the rotation control unit 140 configured as described above will be described in detail.

First, Figures 2a and 2b is an operating state diagram showing the restraint of the rotating plate before the start or the VCM valve open state.

First, when the initial mounting state before starting is described, the plunger 142 in the housing 141 of the rotary control unit 140 is inserted into the receiving groove 144 which is processed in the outer part of the rotating plate 30, As a result, the VCM valve 40 is fixed in the open state.

At this time, the rotating plate 30 is mounted with a tension spring 150 in a tensioned state, and the negative pressure is not applied to the actuating rod 133 connected to the negative pressure actuator 132, and thus the force is caused by negative pressure. There is no state.

In addition, the power coil 143 is connected to the battery always-on power supply (VB +) and ground (GND), so that the current flows in the forward direction when IG ON, the return spring 145 and the plunger 142 is a rotating plate ( The electric current is supplied through a connection terminal (not shown) in the receiving groove 144 that is processed in the outer portion of the 30 to provide the ECU 136 with a signal indicating that the VCM valve 40 is open.

In addition, when the start-up situation is described, after a predetermined time (about 1 to 2 seconds before and after the start), the negative pressure in the surge tank 110 becomes less than -0.5 bar, and the negative pressure chamber 120 has the VCM valve. It is possible to accumulate a negative pressure sufficient to operate the 40.

When the control valve 134 is operated such that the negative pressure is applied to the negative pressure actuator 132 by a control signal from the ECU 136 when a sufficient negative pressure is accumulated in the negative pressure chamber 120, the negative pressure actuator ( 132 illustrates a process of opening the VCM valve 40 by rotating the rotary plate 30 in the direction in which the VCM valve 40 opens through the operation rod 133.

At this time, the plunger 142 is advanced by the return spring 145 is inserted into the receiving groove 144, the rotary plate 30 is fixed to the open state of the VCM valve 40, the rotary plate ( Tension is applied to the tension spring 150 connected to 30).

On the other hand, the plunger 142 is inserted into the receiving groove 144 that is processed in the outer portion of the rotating plate 30 and is energized with the connection terminal in the receiving groove 144, thereby the VCM valve 40 to the ECU 136 ) Will give you a signal that it is open.

3A and 3B are diagrams illustrating an operating state of the rotated state of the rotating plate showing the VCM valve open state at startup.

In this case, when the start signal is given, the battery voltage drops instantaneously, so that the reverse current flows instantaneously through the power supply coil 143 in the housing 141 that is inserted into the receiving groove 144. As the plunger 142 retreats, the rotation of the rotating plate 30 is freed, and the rotating plate 30 is rotated by the tension of the tension spring 150 that is mounted in the tensioned state of the rotating plate 30. The VCM valve 40 is opened by the rotation of the rotating shaft 20 connected to the rotating plate 30.

At this time, the plunger 142 is short-circuited with the connection terminal in the receiving groove 144 that is processed in the outer portion of the rotating plate 30, it can be seen that the VCM valve 40 is closed in the ECU 136 Will provide a signal.

1 is a block diagram of a variable charge motion valve control apparatus of a gasoline direct injection engine according to a preferred embodiment of the present invention.

Figure 2a and Figure 2b is an operating state showing the restraint of the rotating plate showing the state before the start or VCM valve open in accordance with a preferred embodiment of the present invention.

Figures 3a and 3b is an operating state of the rotated state of the rotating plate showing the VCM valve open state at startup in accordance with a preferred embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: intake manifold 20: axis of rotation

30: rotating plate 40: VCM valve

100: operating means 110: surge tank

120: negative pressure chamber 130: rotating part

132: negative pressure actuator 133: operating rod

134: control valve 136: ECU

140: rotation control part 141: housing

142: plunger 143: power coil

144: receiving groove 145: return spring

Claims (6)

A rotating shaft installed through the port of the intake manifold and rotated during external operation; A rotating plate formed at a portion protruding to the outside of the intake manifold and rotating together with the rotating shaft; A VCM valve mounted on the rotary shaft in the port of the intake manifold and rotating together with the rotary shaft to open and close the inside of the port; And operating means connected to the rotating plate to automatically open and close the inside of the port through the VCM valve by controlling the rotation state of the rotating plate; The operation means is formed on one side of the surge tank connected to the intake manifold to receive a negative pressure of the negative pressure chamber that accumulates the negative pressure generated in the intake manifold to rotate the rotary plate connected to the VCM valve by a set rotation angle A rotating part connected to the rotating plate to make it; And Is formed on the outer side of the rotating plate is made of a rotary intermittent for intermittent rotation of the rotating plate to maintain the open and closed state of the VCM valve, The rotating interrupting portion is formed to be close to the rotating plate, the housing is opened in the direction of the rotating plate; A plunger provided inside the housing and moving forward and backward in accordance with a current flow direction of an external power source; A power coil mounted on an inner or outer circumferential surface of the housing corresponding to the circumference of the plunger to guide the flow of current to move the plunger; And Receives the plunger recessed in the side portion in line with the plunger at a position corresponding to the open state or the closed state of the VCM valve and advanced to the outside of the housing, and has a connection terminal to contact the plunger Variable charge motion valve control device for a gasoline direct injection engine comprising a receiving groove for generating a. delete The method of claim 1, The rotating unit is connected to the operating rod hinged to the rotating plate is operated by the negative pressure negative pressure actuator to induce the rotation of the rotating plate by rotating the operating rod along the arc trajectory; A control valve mounted on one side of a negative pressure pipe path connecting the negative pressure chamber and the negative pressure actuator to selectively supply negative pressure or atmospheric pressure to the negative pressure actuator according to a control signal; And Variable charge motion valve control apparatus for a gasoline direct injection engine comprising an ECU for outputting a control signal to the control valve in accordance with an external signal. delete The method of claim 1, And the housing has a return spring therein to maintain a force pushing the plunger toward the rotor plate. The method of claim 1, The swivel plate is provided with a tension spring to guide the return to its original position upon rotation from the initial state; The tension spring is variable charge motion valve control device for a gasoline direct injection engine, characterized in that one end is connected to the outside of the intake manifold and the other end is connected to the rotating plate.

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