JPS63239313A - Variable capacity supercharging device - Google Patents

Abstract

PURPOSE:To enable the supercharged pressure to be controlled in response to the vehicle speed and load by dividing the inside of the housing of a supercharger into a rotor chamber and a pressure chamber by means of a partition plate which may be free to slide in the axial direction, and then introducing the intakepipe negative pressure or the supercharged pressure through a solenoid valve into the pressure chamber. CONSTITUTION:The inside of the housing 20 of a variable capacity supercharger 7, in which both the driving side and the driven side rotors 21, 22 are stored, is divided into a rotor chamber 25 and a pressure chamber 26 by means of a partition plate 23, which is provided on the shafts 21a, 22a of both rotors 21,22 so that it may be free to slide in the axial direction. The pressure chamber 26 is interconnected by means of a passage 8c with the control chamber 9a of a duty solenoid valve 9. In addition, the solenoid valve 9 is controlled through a control circuit 12 according to the output of a throttle valve opening sensor 14 and a vehicle speed sensor 15 in such a manner that the valve is caused to open in response to the output signal of duty factors which are made larger as the vehicle speed is increased, and then, the partition plate 23 is moved to the rotor side as a result of opening the valve 9 so that the supercharged pressure is increased.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an efengin feeder for automatic IlI, in which a partition wall that is slidable in the direction of the rotating shaft is provided in the Roots blower casing constituting the supercharger to make the supercharging volume variable and to adjust the supercharging pressure to the vehicle speed. The present invention also relates to a variable displacement A-type supercharging device which is controlled according to the load. [Conventional technology]

Conventionally, since the volume and efficiency of a supercharger installed in an automobile engine are always constant, it has been difficult to obtain an optimal supercharging pressure depending on the vehicle speed and load. Therefore, it is common to take measures such as installing a bypass passage and a valve in the intake passage of an engine equipped with a supercharger, or adding a similar device. Further, as a supercharger with a variable capacity, for example, as shown in Japanese Patent Laid-Open No. 60-209629, it is equipped with an air pump that is driven by the engine and forcibly feeds combustion air to the intake system. In a supercharged engine, it is known that the air pump is of a variable displacement heavy type, and the air pump is configured to increase or decrease its discharge volume in accordance with the degree of acceleration caused by the accelerator pedal.

[Problems to be solved by the invention]

However, in the conventional embodiment described above, a bypass passage is provided in the engine intake system and a V4 position is required to control the opening and closing of valves, etc., which has disadvantages such as a complicated structure and lacks practicality. . The present invention has been made in view of the above-mentioned circumstances, and in order to make the housing volume of the supercharger variable, a partition plate is provided on the shaft of the rotor inside the housing, and the partition plate is configured to slide in the direction of the shaft. The object of the present invention is to provide a variable capacity supercharging device which controls supercharging pressure according to vehicle speed and load.

[Means to solve the problem]

In order to achieve the above object, according to the present invention, in a supercharged engine having a supercharger disposed in an intake pipe of the engine, the inside of the housing of the supercharger is connected to the rotor of the supercharger. The pressure chamber is divided into a rotor chamber and a pressure chamber via a partition plate that is slidable in the direction of the shaft, and an intake pipe is connected to the pressure chamber of the supercharger from the upstream and downstream sides of the supercharger. A passage guiding negative pressure or supercharging pressure is communicated through a duty solenoid valve that is duty-controlled, and the duty solenoid valve is configured to be switchable by a throttle valve opening signal and a vehicle speed signal. be.

[For production]

Based on the above configuration, according to the present invention, the inside of the supercharger housing is divided into a rotor chamber and a pressure chamber via a partition plate that slides in the shaft direction of the rotor of the supercharger, and the rotor chamber volume is reduced. It is configured to be variable and control the efficiency of boost pressure, and when the engine is at low speed and low load,
Since the intake pipe negative pressure on the downstream side of the turbocharger is introduced into the pressure chamber of the turbocharger and increases the rotor chamber volume, it is not necessary to provide a bypass passage (supercharging pressure will leak. Also, at high speeds and high loads, , the duty is controlled by the throttle opening signal and the vehicle speed signal, and positive pressure downstream of the turbocharger is introduced into the pressure chamber of the turbocharger, reducing the rotor chamber volume and improving the turbocharging efficiency. By making the volume of the rotor chamber of the supercharger variable, it becomes possible to perform appropriate supercharging control according to vehicle speed and load.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail based on the attached drawings. FIG. 1 is a schematic configuration diagram showing a supercharger device for an automobile engine according to the present invention, and FIG. 2 is a longitudinal cross-sectional view showing a variable capacity supercharger according to the present invention. Main body, 2 is an intake pipe, 3 is an exhaust pipe, 4 is a fuel injection valve,
5 indicates an air cleaner, and 6 indicates a throttle valve. A variable displacement supercharger 7 is installed in the intake pipe 2 that introduces the intake air drawn from the air cleaner 5 into the engine body 1, and exclusively supplies intake air from the upstream and downstream sides of the variable displacement supercharger Ia7. The passage &a, 8b is the mi of the duty solenoid valve 9 which performs duty control by a three-way valve etc.
IIJ111 of the duty solenoid valve 9 is connected to the control chamber 9a, and the passage 8C is connected to the IIJ111 chamber 9a of the duty solenoid valve 9.
It communicates with a pressure chamber of a variable displacement supercharger 7, which will be described later. The upstream passage 8a of the variable capacity supercharger 7 has a throttle 1
0 is provided, and when the solenoid valve 9 opens, most of the positive pressure due to supercharging leaks through the passage 8a into the intake pipe 2 between the downstream of the throttle valve 6 and the upstream of the supercharger 7, causing supercharging. This prevents variable capacity control of machine 7 from becoming impossible. In addition, the control chamber 9a of the duty solenoid valve 9
, the passage 8b communicating with the downstream side of the intake pipe 2 is 17fl.
A related valve 11 is installed, and when the solenoid 13 is energized by a drive signal from the control circuit 12, it opens the passage 8b and acts to return the negative pressure of the supercharger 7 to positive pressure. Furthermore, as shown in FIG. 3, signals from a throttle valve opening sensor 14 and a vehicle speed sensor 15 are input to the control circuit 12, respectively, and the throttle valve opening calculation means 16 and vehicle speed calculation means 17 are used to open the throttle valve. At the same time, the throttle valve opening signal θ and the vehicle speed signal N are input to the duty ratio search unit 1B, and the duty ratio is searched from the corresponding address using the three-dimensional map shown in FIG. Then, a duty ratio signal is outputted to the duty solenoid valve 9 via the drive circuit 19. On the other hand, in the variable capacity supercharging fi7 according to the present invention, as shown in FIG.
．． A partition plate 23 that can freely slide in the axial direction of the shafts 21a and 22a of 22 is disposed on the shafts 21a and 22a via a sealing material 24 such as a ring.
The interior of the housing 20 is divided into a rotor chamber 25 by the partition plate 23.
and a pressure chamber 26. The partition plate 23 includes a shaft 21a of the pressure chamber 26,
The pressure chamber 26 is biased by a spring 27 interposed on the outer periphery of the valve 22a, and communicates with the control chamber 9a of the duty solenoid valve 9 via a passage 8C. Also, the Q of the above supercharger 7! A drive pulley 28 driven by a belt by an engine crankshaft (not shown) is fixed to one end shaft 21b of the moving rotor 21, and a gear chamber divided by a pressure chamber 26 and a partition wall 29 is attached to the other end shaft. A drive gear 31 is fixedly positioned within the rotor 30 and meshes with a driven gear 32 that is fixed to the shaft 22a of the driven rotor 22. Here, a partition plate 23 disposed inside the housing 20
is set by a spring 27 so that the volumes of the rotor chamber 25 and the pressure chamber 2G are equal, and the pressure chamber 2G is
The upstream passage 8a of the supercharger 7 is communicated with the intake pipe negative pressure via the passage 8C, and the pressure v2G becomes negative pressure, which pulls the partition plate 23 against the spring 27. When the volume of the chamber 25 increases and the rotor chamber 25 acts as a bypass passage, and conversely, the downstream passage 8b of the supercharging fM7 is communicated with the pressure chamber 26 via the passage 8C, the pressure chamber 26
becomes higher pressure than the rotor chamber 25 and pushes the partition plate 23, the volume of the rotor v25 becomes smaller and the supercharging pressure increases. Hereinafter, the operation of the variable capacity supercharger according to the present invention configured as described in detail will be explained. First, when the engine is idling or at low load and low speed, the fourth
Since the duty ratio 0% is searched using the three-dimensional map shown in the figure, the valve 11 of the duty solenoid valve 9 remains closed to the passage 8b, so the difference between the downstream of the throttle valve 6 and the upstream of the supercharger 7 is Intake pipe negative pressure is introduced into the negative pressure chamber 26 of the supercharger 7 through the passage 8a, and the partition plate 23 is pulled against the biasing force of the spring 21, the volume of the rotor chamber 25 is increased, and the rotor 21, 22 and Since the supercharging pressure leaks from between the partition plate 23 and the partition plate 23, the supercharging pressure hardly increases. Further, as the throttle valve 6 is opened and the vehicle speed increases, the duty ratio increases, and the duty ratio signal outputted from the drive circuit 19 of the control circuit 12 to the duty solenoid valve 9 increases, and the duty ratio signal output from the drive circuit 19 of the control circuit 12 to the duty solenoid valve 9 increases. Since the valve 11 opens the passage 8b, the supercharging pressure downstream of the supercharging ta7 is introduced into the pressure chamber 26 of the supercharger 7, and the biasing force of the spring 27 and the introduced positive pressure cause the partition plate to close. 23 is the rotor 21. in the rotor chamber 25.
22 side, the leak m is reduced and the supercharging pressure is increased. In addition, in order to prevent engine damage due to an increase in supercharging pressure from the supercharger 7 when the engine rotates at high speed, as shown in FIG. ! 2 pressure sensor 3
3 is installed in the control circuit 12, and an intake pipe pressure calculation means 34 is installed in the control circuit 12.
is provided so that when the intake pipe pressure downstream of the supercharger 7 exceeds a predetermined value, the correction unit 35 forcibly sets the duty ratio to 0.
%, and by doing this, when the boost pressure exceeds a predetermined value, the leakage in the supercharger 7 is increased and the boost pressure is lowered, thereby protecting the engine. It is possible to achieve this goal. Effects of the Invention As described in detail above, according to the present invention, by providing the shaft of the rotor inside the housing of the supercharger with a partition plate that is slidable in the shaft direction, the rotor chamber volume of the supercharger can be reduced. The supercharger is configured to make the supercharger variable and control the supercharging pressure according to the vehicle speed and load.As in the conventional example, a bypass passage is provided outside the supercharger, and the opening and closing is controlled by a valve, etc. This eliminates the need for complicated devices such as servicing, and enables appropriate control of supercharging pressure according to vehicle speed and load with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a supercharger device for an automobile engine according to the present invention, FIG. 2 is a longitudinal sectional view showing a variable capacity supercharger according to the present invention, and FIG. 3 is a schematic diagram showing a supercharger device according to the present invention. FIG. 4 is a block diagram showing a control circuit; FIG. 4 is an explanatory diagram of a map showing a duty ratio based on a throttle valve opening signal θ and a vehicle speed signal N; FIG. 5 is a block diagram of a control circuit showing another embodiment of the present invention. be. DESCRIPTION OF SYMBOLS 1... Engine body, 2... Intake pipe, 6... Throttle valve, 7... Variable capacity supercharger, 8a, a
b, 8c... passage, 9... duty solenoid valve, 11... valve, 12... control circuit, 1
4...Throttle opening sensor, 15...Vehicle speed sensor>20...Housing, 21...Drive side rotor, 2
1a... Shaft, 22... Driven side rotor, 22a
... shaft, 23 ... partition plate, 25 ... rotor chamber, 26 ... pressure air, 27 ... spring. Figure 2

Claims (1)

[Scope of Claims] A supercharged engine in which a supercharger is disposed in an intake pipe of the engine, wherein the inside of the housing of the supercharger is provided on the shaft of the rotor of the supercharger, and the It is divided into a rotor chamber and a pressure chamber via a partition plate that can be slid in the shaft direction, and intake pipe negative pressure or supercharging pressure is introduced into the pressure chamber of the turbocharger from the upstream and downstream sides of the turbocharger. 1. A variable capacity supercharger device, wherein the variable displacement passage communicates with a duty solenoid valve whose duty is controlled, and the duty solenoid valve is switchable by a throttle valve opening signal and a vehicle speed signal.