JP2002349274A - Variable nozzle mechanism operation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable nozzle mechanism operation device of a variable displacement turbine capable of remotely controlling a vane angle of a nozzle vane with an extremely simple and inexpensive structure, having high reliability by surely preventing the occurrence of failure of a vane angle control device, capable of continuously changing the vane angle of the nozzle vane by following a change in an engine operation state, improving responsiveness of the turbine, and reducing an engine sound in a variable nozzle mechanism of the variable displacement turbine. SOLUTION: The variable nozzle mechanism of the variable displacement turbine is constituted so as to change the vane angle of the nozzle vane via a nozzle vane operation link by operation of an actuator, and is characterized in that the actuator is constituted as a linearly controlling actuator, the actuator and the nozzle vane operation link are connected by a flexible wire, and the vane angle of the nozzle vane is constituted so as to be continuously changeable according to output of the actuator via the flexible wire and the nozzle vane operation link by the actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercharger (exhaust turbocharger) of an internal combustion engine and the like, and the blade angles of a plurality of nozzle vanes arranged along the circumferential direction of a turbine are controlled by operating an actuator. The present invention relates to a variable nozzle mechanism operating device for controlling and operating a variable nozzle mechanism of a variable capacity turbine configured to be changed via a nozzle vane operation link.

[0002]

2. Description of the Related Art In an internal combustion engine with a supercharger, exhaust gas sent from a spiral scroll to a turbine rotor in order to match a flow rate of exhaust gas from the engine with a gas flow rate which is an optimum operating condition of the supercharger. 2. Description of the Related Art A supercharger including a variable capacity turbine that varies a flow rate according to an operation state of an engine has been widely used in recent years.

FIG. 3 shows an example of a variable nozzle mechanism operating device for controlling and operating a variable nozzle mechanism that changes the blade angle of a nozzle vane by operating an actuator in order to set the turbine capacity in such a variable capacity turbine. FIG.
In the figure, reference numeral 100 denotes a variable capacity turbine (hereinafter referred to as a turbine), and a nozzle vane 102 having a variable blade angle.
It has. 101 is a turbine rotor. During the operation of the turbine, a detection signal of the supply pressure of the engine (not shown) from the supply pressure sensor 23 and a detection signal of the engine speed from the engine speed sensor 24 are input to the control unit 103.

[0005] Magnet valves 105a, 105b and 105c are three-way opening / closing controls. An air tank 1 is provided at the entrance of each of the magnet valves 105a, 105b and 105c.
Compressed air is led from the air valve 04 through an air pipe 106, while the magnet valves 105a, 105b, 105
The outlet side of c is connected to the air cylinder 108. The air cylinder 108 is provided with three spools of two positions in series, and the three magnet valves 105a,
Eight positions can be controlled in combination with 105b and 105c. Then, the control unit 103 calculates a blade angle of the nozzle vane corresponding to the engine operation state based on the engine operation state detection signal, and inputs an opening / closing signal according to the blade angle calculation value to the three magnet valves 105a, 105b, and 105c. The three
When the two magnet valves 105a, 105b, 105c are selectively opened and closed, the magnet valves 105a, 105b,
05b, 105c to the air pipes 107a, 107b, 10
Working air is selectively supplied to the three inlet ports of the air cylinder 108 through the air cylinder 10c.
The eight output terminals are controlled to eight positions.

A link 011 is fixed to an output end of the air cylinder 108, and the link 011 is rotatably connected to a lever 9 constituting a variable nozzle mechanism on the turbine 100 side via a pin 012. The root of the lever 9 is rotatably supported by a lever shaft 10 attached to the main body of the turbine 100. However, when the output end of the air cylinder 108 is set to the 8-position control position via the control unit 103 and the three magnet valves 105a, 105b, 105c, the lever shaft is connected via the link 011 and the lever 9. The rotation of the lever shaft 10 causes the drive ring (not shown) of the variable nozzle mechanism 200 to rotate, and the rotation of the drive ring changes the blade angle of the nozzle vane 102 to the control position.

[0006]

However, in the prior art shown in FIG. 3, a plurality of three-way opening / closing control magnet valves (105a, 105a) using compressed air are used.
05b, 105c,...) And the air cylinder 108 at the two positions of the multiple input ports are connected to the air pipes (107a, 107b,
107c) to change the vane angle of the nozzle vanes 102, so that the air piping increases, the device becomes larger, the cost increases, and malfunctions such as leakage of working air occur. There is a problem with the reliability of blade angle control.

In the prior art, the magnet valves 105a, 105b,
5c and 3 input port 2 position air cylinder 108
And the output end of the air cylinder 108 is set to 8
The structure is such that the position of the nozzle vanes 102 is controlled in accordance with the engine operating state.
Of the engine is intermittently changed, so that the supply and displacement of the engine with respect to the change in the engine operating state change intermittently, so that the engine noise increases.

The present invention has been made in view of the problems of the prior art, and in a variable nozzle mechanism of a variable capacity turbine, a blade angle of a nozzle vane can be remotely controlled with a very simple and low-cost structure, and a failure of a blade angle control device occurs. Variable capacity that has high reliability because it is reliably prevented, and that the blade angle of the nozzle vane can be continuously changed according to changes in the engine operating state to improve the responsiveness of the turbine and reduce engine noise An object of the present invention is to provide a variable nozzle mechanism operating device for a turbine.

[0009]

According to the present invention, in order to solve the above-mentioned problem, the blade angles of a plurality of nozzle vanes arranged along the circumferential direction of the turbine are controlled by operating an actuator. In a variable nozzle mechanism of a variable capacity turbine configured to change via a nozzle vane operation link, the actuator is configured as a linear control type actuator capable of continuously changing the displacement of an output end, and the actuator and the nozzle vane are changed. The operation link is connected with a flexible wire such as a Mohs wire, and the blade angle of the nozzle vane can be continuously changed by the actuator according to the output of the actuator via the flexible wire and the nozzle vane operation link. We propose a variable nozzle mechanism operating device characterized by comprising .

Preferably, a control box accommodating the actuator and the controller is installed at a location separated from the variable capacity turbine, and an output end of the actuator is connected to the flexible wire. To connect to the nozzle vane operation link of the variable capacity turbine.

[0011] The invention described in claim 2 is based on the first aspect.
An engine operating state detecting means for detecting an engine operating state such as an engine speed and an air supply pressure; and adapting the engine operating state based on the engine operating state detection signal input from the engine operating state detecting means. Nozzle angle calculating means for calculating a blade angle of the nozzle vane (nozzle angle); and actuator operation amount calculating means for calculating an operation amount of the actuator corresponding to the blade angle calculated by the nozzle angle calculating means. A controller for continuously changing the operation amount of the actuator in accordance with the engine operating state is provided.

According to this invention, the actuator is configured as a linear control type actuator in which the displacement of the output terminal can be continuously changed, and the operation amount of the actuator is continuously changed by the controller according to the engine operating state. Thus, the blade angle of the nozzle vanes can be continuously changed with respect to the engine operating state, and the responsiveness of the turbine to the change in the engine operating state is improved. As a result, the change in the supply and exhaust of the engine with respect to the change in the engine operating state is continuous, and the engine noise can be reduced. Also, any type of actuator can be used as long as it is a displacement output type, so that it is easy to increase the driving force of the variable nozzle mechanism, and the device of the present invention can be applied to a large-sized variable capacity turbine. .

According to the invention, the output of the actuator and the variable nozzle mechanism for operating the nozzle vane are connected by a flexible wire including a Mohs wire, and the displacement output of the actuator is connected to the flexible wire. The control box containing the actuator and controller can be changed without transmitting air or hydraulic piping through the variable nozzle mechanism without causing leakage of air or hydraulic oil from the piping. The variable nozzle mechanism can be easily remotely controlled by being installed at a location remote from the capacity turbine.

As a result, the control box can be freely installed, the space in the engine having the variable capacity turbine can be effectively used, and the apparatus can be reduced in size by eliminating the need for air piping and hydraulic piping.
Cost can be reduced. Further, since the air piping and the hydraulic piping are not required, malfunctions such as leakage of working air and working oil are prevented from occurring, and reliability of blade angle control is improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, unless otherwise specified. It's just

FIG. 1 is an overall configuration diagram of a variable nozzle mechanism operating device in a variable capacity turbine according to an embodiment of the present invention, and FIG. 2 is a control block diagram of a nozzle vane blade angle.

In FIG. 1 showing the overall configuration of a variable nozzle mechanism operating device according to an embodiment of the present invention, reference numeral 200 denotes a variable nozzle mechanism of a variable capacity turbine 100 (see FIG. 3, hereinafter referred to as a turbine). In the variable nozzle mechanism 200, reference numeral 11 denotes a link fixed to an end of the Morse wire 5 described later, and reference numeral 9 denotes a lever, the end of which is rotatably connected to the link 11 via a pin 12. Reference numeral 10 denotes a lever shaft, which is rotatably supported on the main body side of the turbine 100. A root portion of the lever 9 is fixed to one end and a root portion of the lever 13 is fixed to the other end. Reference numeral 14 denotes a drive ring, which is connected to the other end of the lever 13 and is rotated by the swing of the lever 13 so that the nozzle vane 102
To change the wing angle. The configuration itself of the variable nozzle mechanism 200 described above is known.

Reference numeral 1 denotes a control box, in which an actuator 3 and a controller 2 for controlling and operating the actuator 3 are housed. The actuator 3
Is a linear control type actuator in which the displacement of the output end can be continuously changed, and may be an electric type or an electro-hydraulic type as long as it is a displacement output type. Since the configuration of the actuator 3 is known, a detailed description of the structure is omitted. 5
Is a Morse wire, one end of which is connected to the output end 4 of the actuator 3 and the other end of which is connected to the link 11 of the variable nozzle mechanism 200. The Morse wire 5 is inserted into the outer tube 6 so as to be relatively movable.
Protects the Morse wire 5. Reference numeral 7 denotes an abutment fixed to the main body 15 of the engine or the turbine. An intermediate portion of the outer tube 6 protecting the Mohs wire 5 is fixed to the abutment 7 via a support portion 8 so that the Mohs wire 5 can be operated stably. ing.

As shown in FIG. 2, during the operation of the variable displacement turbine equipped with the variable nozzle mechanism operating device having the above-described configuration, a detection signal of the supply pressure of the engine from the supply pressure sensor 23 and an engine speed sensor are provided. From 24, an engine operating state detection signal including an engine speed detection signal and the like is input to the nozzle angle calculation unit 21 of the controller 2. A nozzle angle setting unit 27 sets an appropriate nozzle angle for each engine operating state. The nozzle angle calculation unit 21 selects (or calculates) a nozzle angle corresponding to the detection signal from the nozzle angle setting unit 27 based on the input engine operation state detection signal, and sends the selected nozzle angle to the actuator operation amount calculation unit 22. input.

The actuator operation amount calculation unit 22 calculates the operation amount of the nozzle vane 102 (see FIG. 3) driving actuator 3 which becomes the selected value of the nozzle angle, that is, the blade angle in the nozzle angle calculation unit 21. hand,
Output to the actuator 3. The actuator 3
Transmits a displacement output corresponding to the selected value of the blade angle to the Mohs wire 5, and the displacement of the Mohs wire 5
Is transmitted to the drive ring 14 via the lever 9, lever shaft 10, and lever 13 of the variable nozzle mechanism 200, and the rotation of the drive ring 14 causes the nozzle vane 1 to rotate.
02 (see FIG. 3) is changed.

Therefore, according to this embodiment, the actuator 3 is configured as a linear control type actuator in which the displacement of the output terminal 4 can be continuously changed, and the operation amount of the actuator is controlled by the controller 2 in the engine operating state. , The blade angle of the nozzle vanes 102 can be continuously changed with respect to the engine operating state, and the responsiveness of the turbine 100 to the change in the engine operating state is improved. Any type of 3 itself can be used as long as it is a displacement output type, so that the driving force of the variable nozzle mechanism 200 can be easily increased.

The output end of the actuator 3 and the variable nozzle mechanism 200 for operating the nozzle vane 102 are connected by a Mohs wire 5, and the displacement output of the actuator 3 is transmitted via the Mohs wire 5 to the variable nozzle mechanism 200. The control box 1 in which the actuator 3 and the controller 2 are housed can be connected to the turbine 100 (see FIG. 1) without the need for air piping or hydraulic piping, and without causing leakage of air or hydraulic oil from the piping. 3) and a variable nozzle mechanism 2
00 can be easily remotely controlled.

[0023]

As described above, according to the present invention, the output end of the actuator and the variable nozzle mechanism are connected by a flexible wire, and the displacement output of the actuator is transmitted through the flexible wire. Because it is transmitted to the variable nozzle mechanism,
A control box containing an actuator and a controller is installed at a place away from the variable capacity turbine without the need for air pipes or hydraulic pipes, and without causing leakage of air or hydraulic oil from the pipes. The mechanism can be easily remotely controlled.

This eliminates the need for air piping and hydraulic piping, which makes it possible to reduce the size and cost of the apparatus, to prevent malfunctions such as leakage of working air and working oil, and to improve the reliability of blade angle control. The performance is improved. In addition, since the actuator and the variable nozzle mechanism are connected only by a flexible wire, the degree of freedom in installing the control box can be obtained, and the space in the engine having the variable capacity turbine can be effectively used. Become.

Further, the actuator is constituted by a linear control type actuator in which the displacement of the output end can be continuously changed, and the operation amount of the actuator is continuously changed in accordance with the engine operation state. In contrast, the blade angle of the nozzle vanes can be continuously changed, and the responsiveness of the turbine to changes in the engine operating state is improved. As a result, the change in the supply and exhaust of the engine with respect to the change in the engine operating state is continuous, and the engine noise can be reduced. Further, any type of actuator can be used as long as it is a displacement output type, so that it is easy to increase the driving force of the variable nozzle mechanism, and the device of the present invention can be applied to a large-sized variable capacity turbine. .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a variable nozzle mechanism operating device in a variable capacity turbine according to an embodiment of the present invention.

FIG. 2 is a control block diagram of a nozzle vane blade angle in the embodiment.

FIG. 3 is an overall configuration diagram of a variable nozzle mechanism operating device according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control box 2 Controller 3 Actuator 5 Mohs wire 6 Outer tube 7 Abutment 8 Support part 9 Lever 10 Lever shaft 11 Link 13 Lever 14 Drive ring 21 Nozzle angle calculation part 22 Actuator operation amount calculation part 100 Variable capacity turbine 102 Nozzle vane 200 Variable nozzle mechanism

Claims (3)

[Claims] 1. A variable nozzle mechanism of a variable capacity turbine configured to change a blade angle of a plurality of nozzle vanes arranged along a circumferential direction of a turbine via a nozzle vane operation link by operating an actuator.
The actuator is configured as a linear control actuator in which the displacement of the output end can be continuously changed, and the actuator and the nozzle vane operation link are connected by a flexible wire such as a Mohs wire, and the actuator is A variable nozzle mechanism operating device, characterized in that a blade angle of the nozzle vane can be continuously changed in accordance with an output of the actuator via a flexible wire and a nozzle vane operating link. 2. An engine operating state detecting means for detecting an engine operating state such as an engine load, an engine speed, an air supply pressure and the like, and based on the engine operating state detecting signal inputted from the engine operating state detecting means. Nozzle angle calculation means for calculating a blade angle (nozzle angle) of the nozzle vane adapted to the engine operation state, and actuator operation for calculating an operation amount of the actuator corresponding to the blade angle calculated by the nozzle angle calculation means 2. The variable nozzle mechanism operating device according to claim 1, further comprising a controller having an amount calculating means for continuously changing an operation amount of the actuator in accordance with the engine operating state. 3. A control box containing the actuator and the controller is installed at a location separated from the variable capacity turbine, and an output end of the actuator is connected to a nozzle vane operating link of the variable capacity turbine by the flexible wire. 3. The variable nozzle mechanism operating device according to claim 2, wherein: