KR20020051785A - boost pressure controlling system of turbocharger - Google Patents

Abstract

PURPOSE: A control system for boost pressure of a turbocharger is provided to variably control the boost pressure according to the driving state. CONSTITUTION: In an actuator comprising a pressure introducing part introducing the boost pressure supplied from a turbocharger, a piston(10) vertically moving by the boost pressure in the actuator, a piston rod(7) connected to the piston and opening a wastegate(5) when the piston is moved vertically, a spring(8) installed inside the actuator to support the piston so that shutting off the wastegate by moving up the piston at a low boost pressure, An actuator control system comprises an 'N' port installed at the part high pressure is applied in a compressor housing of the turbocharger, a 'J' port installed at the part low pressure is applied in the compressor housing of the turbocharger, first and second solenoid valves connected to the 'N' port and the 'J' port, the first introducing part(22) of the actuator introducing the pressure of the 'N' port, the second introducing part(23) of the actuator introducing the pressure of the 'J' port, a partition plate(20) installed at the piston rod inside the actuator, the second stoppers(21) installed at the upper and lower parts inside the actuator to restrict the movement of the partition plate, and an ECU controlling the first and second solenoid valves of the 'N' port and the 'J' port of the compressor according to the driving condition of a vehicle.

Description

Boost pressure controlling system of turbocharger

The present invention relates to a boost pressure control apparatus for a turbocharger capable of controlling various boost pressures generated in a turbocharger of a vehicle according to a driving type.

An actuator of a general turbocharger is installed to drive a west gate that bypasses the exhaust gas of the exhaust pipe when the compressed air of the intake pipe is over a predetermined pressure.

In general, increasing the engine displacement increases the engine output. That is, in order to improve the output of the engine, a large amount of air must be sucked into the cylinder. The vehicle turbocharger is one of the devices used to increase the engine output by increasing the amount of intake air in the cylinder as described above.

1 is a schematic diagram of a boost pressure control device of a conventional turbocharger, wherein the turbocharger is configured by connecting a turbine 2 and a compressor 4 to a drive shaft 11, wherein the turbine 2 drives an engine. Rotating by the pressure of the exhaust gas generated at the time, the compressor (4) during the rotation of the turbine (2) also operates at the same time to compress the air to generate a boost pressure. The boost pressure actuates the actuator 6 to regulate the westgate 5. The fuel injection amount required for combustion is supplied to the engine by the adjustment of the west gate 5.

As shown in FIG. 2, the conventional actuator 6 includes a pressure introduction portion of an actuator for introducing a boost pressure supplied from a turbocharger, a piston 10 operating up and down by a boost pressure in the actuator 6, A piston rod (7) connected to the piston (10) to operate the west gate (5) during vertical movement of the piston (10), and a spring (8) installed in the actuator to elastically support the piston (10). It consists of.

In the actuator 6, if the pressure supplied from the compressor 4 of the turbocharger is less than the force of the elastic spring 8, the westgate 5 is closed, and the pressure supplied from the compressor 4 of the turbocharger is When the elastic spring 8 is larger than the force of the elastic spring 8, the west gate 5 is opened to reduce the wheel rotation speed of the turbocharger so that the boost pressure supplied to the intake machine does not exceed a certain pressure.

In this case, however, as shown in FIG. 3, the role of the actuator 6 is that if the pressure supplied from the compressor 4 of the turbocharger is less than the force of the elastic spring 8, the westgate 5 is closed. The section A and the pressure supplied from the compressor 4 of the turbocharger are larger than the force of the elastic spring 8 to form the section B where the west gate 5 opens. The actuator has a problem that only two types of control are possible, A and B. That is, there is a problem that only one of the low speed or high speed parts of the turbocharger can be controlled at the target.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide an actuator control apparatus capable of controlling various boost pressures generated in a turbocharger of a vehicle engine according to a driving type.

The actuator control system of the present invention for achieving the above object is a pressure introduction portion of the actuator for introducing a boost pressure supplied from the turbocharger, a piston which is operated up and down by a boost pressure in the actuator, and is connected to the piston In the actuator consisting of a piston rod for opening and closing the west gate in the vertical operation of the piston, and a spring installed inside the actuator to support the piston to raise the piston when the boost pressure is low to close the west gate,

An N port installed at a high pressure in the turbocharger compressor housing 15, a J port installed at a low pressure in the compressor housing, first and second solenoid valves connected to the N port and the J port, and The movement of the diaphragm is performed on the first introduction portion of the actuator into which the pressure of the N port is introduced, the second introduction portion into which the pressure of the J port is introduced, the diaphragm provided on the piston rod inside the actuator, and the upper and lower portions of the actuator. And a second stopper for limiting and an electronic controller for controlling the first and second solenoid valves of the J port and the N port of the compressor according to the driving state of the vehicle.

1 is a schematic diagram of a boost pressure control device of a conventional turbocharger;

2 is a cross-sectional view showing the structure of a conventional actuator for driving a turbocharger;

Figure 3a is a cross-sectional view showing a compressor housing of the turbocharger according to the present invention;

Figure 3b is a cross-sectional view having a solenoid valve in the compressor housing of the turbocharger according to the present invention;

4 is a cross-sectional view showing the structure of an actuator for driving a turbocharger according to the present invention;

5A is a characteristic diagram showing control of a boost pressure according to a conventional engine rpm;

Figure 5b is a characteristic diagram showing the control of the boost pressure in various forms according to the present invention,

Figure 6 is a block diagram showing the control of an actuator according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1-pipe 2-turbine

3-intake 4-compressor

5-Westgate 6-Actuator

7-piston rod 8-spring

9-First Stopper 10-Piston

11-drive shaft 15-compressor housing

20-plate 21-second stopper

22-First Introduction 23-Second Introduction

24-N port 25-J port

26-Second Solenoid Valve 27-Second Solenoid Valve

28-ECU

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

Figure 3 is a block diagram showing a control device of the turbocharger compressor housing 15 according to an embodiment of the present invention, the control device of the compressor housing 15 is installed where the pressure in the turbocharger compressor housing 15 is formed high The N port 24, the J port 25 installed in the place where the pressure in the compressor housing 15 is formed low, the first solenoid valve 26 connected to the N port 24, and the J port 25 A second solenoid valve (27) connected to the &lt; RTI ID = 0.0 &gt;), &lt; / RTI &gt;

4 is a configuration diagram of an actuator according to an embodiment of the present invention, in which the first introduction portion 22 of the actuator 6 into which the pressure of the N port 24 of the turbocharger compressor housing 15 is introduced, The second introduction portion 23 through which the pressure of the J port 25 is transmitted, the piston 10 which is operated up and down by a boost pressure in the actuator 6, and the actuator 6 to support the piston 10. Spring 8 to raise the piston 10 to close the west gate 5 when the boost pressure is low, and a west gate connected to the piston 10 to operate the piston 10 up and down. (5) for limiting the movement of the diaphragm (20), the diaphragm (20) provided in the piston rod (7) inside the actuator (6), and the upper and lower portions of the actuator (6) The second stopper 21 is provided.

FIG. 6 shows various types of boost pressures by controlling solenoid valves connected to the N port 24 and the J port 25 of the compressor 4.

Fig. 7 is a block diagram showing the control logic of the actuator.

Hereinafter, the operation of the boost pressure control device of the turbocharger according to the present invention will be described.

Figure 5 shows the boost pressure generated by the existing actuator (6). The illustrated figure closes the second solenoid valve 27 connected to the J port 25 of the compressor 4 and opens the first solenoid valve 26 connected to the N port 24 of the compressor 4. It can be obtained by.

The type B type of Fig. 6 is used to obtain low starting speed and acceleration performance by obtaining a high boost pressure in a low speed section. To this end, the second solenoid valve 27 connected to the J port 25 of the compressor 4 is opened, and the first solenoid valve 26 connected to the N port 24 of the compressor 4 is also opened. Since the pressure of the second introduction portion 23 of the actuator 6 connected to the J port 25 is high, the piston 10 of the actuator 6 is not operated so that the westgate does not open. This state is maintained until a type A of FIG. 6 passes, and the second solenoid valve 27 of the J port 25 of the compressor 4 is reached at a point in time to obtain the form as shown in FIG. Closing

The type C type of FIG. 6 is used when the high boost pressure is obtained in the high speed section to improve the high fuel economy and to obtain output enhancement. To this end, the first solenoid valve 26 connected to the N port 24 of the compressor 4 is opened, and the second solenoid valve 27 connected to the J port 25 of the compressor 4 is also closed. At this time, since the pressure of the first introduction portion 22 of the actuator 6 connected to the N port 24 of the compressor 4 is high, the piston 10 of the actuator 6 is operated to open the west gate 5. do. After reaching the high speed section, the second solenoid valve 27 connected to the J port 25 of the compressor 4 is opened, and the first solenoid valve 26 connected to the N port 24 of the compressor 4 is opened. ) Is also closed, so that the west gate 5 is closed. In other words, as the pressure of the turbine 2 increases, the boost pressure increases.

By using the pressure difference generated in the compressor housing of the turbocharger as described above, the boost pressure can be controlled according to the required form by turning on / off the first and second solenoid valves. As described above, the boost pressure can be controlled according to the required shape, thereby achieving fuel efficiency improvement at low starting speed and high speed.

Claims (2)

A pressure introduction portion 14 of an actuator for introducing a boost pressure supplied from a turbocharger, a piston 10 which is operated up and down by a boost pressure in the actuator 6, and connected to the piston 10 so as to connect the piston ( Piston rod (7) for opening and closing the west gate (5) during the vertical operation of the 10) and the actuator (6) to support the piston (10) to raise the piston (10) when the boost pressure is low to raise the waist In the actuator 6 consisting of a spring 8 which causes the gate 5 to close, N port 24 provided where the pressure in the turbocharger compressor housing 15 is formed high, J port 25 installed where the pressure in the compressor housing 15 is formed low, and the N ports 24 and J First and second solenoid valves 26 and 27 connected to the port 25, the first introduction portion 22 of the actuator 6 into which the pressure of the N port 24 is introduced, and the J port 25 The movement of the diaphragm 20 is performed on the second introduction portion 23 through which the pressure of the gas is introduced, the diaphragm 20 provided on the piston rod 7 inside the actuator 6, and the upper and lower parts inside the actuator 6. An electronic control device 28 for controlling the second stopper 21 for limiting and the first and second solenoid valves 26 and 27 of the J port 25 and the N port 24 of the compressor according to the driving state of the vehicle. Turbocharger actuator (6) control device for a vehicle, characterized in that it comprises a. During the low speed section of the vehicle, the first and second solenoid valves 26 and 27 of the J port 25 and the N port 24 are opened to prevent the west gate 5 from being opened, and then the rpm of the engine is maintained at a constant speed. In addition, the second solenoid valve 27 of the J port 25 is closed, and the first solenoid valve 26 of the N port 24 is opened and the second solenoid valve of the J port 25 is opened during the high speed section of the vehicle. After closing (27), when the RPM of the engine reaches the high speed section, the second solenoid valve 27 of the J port 25 is opened and the first solenoid valve 26 of the N port 24 is closed. By allowing the gate 5 to be closed, the first and second solenoid valves 26 and 27 of the J port 25 and the N port 24 to increase the boost pressure of the engine when the vehicle starts at low speed and runs at high speed. Vehicle actuator control device having an electronic control device for controlling the 28.