JPS59134324A - Super-charger control device in internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce a loss in the horse power of an engine by ceasing the function of a super-charger in a range of idling, low load or deceleration where no super-charging is required, and as well to enhance the horse power of the engine by making the function of the supercharger exhibit in a high load range where the super-charging is required. CONSTITUTION:Upon engine operation in a range of idling, low load or deceleration a throttle valve is opened to its idling opening degree or slightly more. Control force is not transferred from a control lever 20 to an operating lever 22, but an intermediate lever 26 is rotated counterclockwise by the torsional force of a valve opening spring 28 to rotate the operating lever 22 counterclockwise through a wire 30 for engaging a stopper 31 with a stopper pin 32, thereby a bypass valve 17 is fully opened by means of an opening and closing lever 23. Upon engine operation in a high load range in which the throttle valve 12 is opened to a predetermined degree, the bypass valve 17 is fully closed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a supercharger control device for an internal combustion engine, in which a supercharger driven by an engine quantity or force is disposed upstream of a throttle valve in an intake passage.

In this type of engine, the idle link, which does not require supercharging, stops the function of the supercharger in low load and deceleration regions to reduce engine horsepower loss, while in high load regions that require supercharging, overload is achieved. It is necessary to improve the horsepower of the engine by ensuring that the feeding machine functions properly.

An object of the present invention is to provide the supercharger control device that can satisfy the above requirements.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. An internal combustion engine main body 1 has a cylinder block 3 on which a piston 2 is slidably connected, and a cylinder head 4 connected thereon in an overlapping manner. Combustion chamber 5
is formed. An intake port 6 and an exhaust port 7 are opened in the combustion chamber 5, and the boats 6 and T are alternately opened and closed by an intake valve 8 and an exhaust valve 9.

An intake passage 10 and an exhaust passage 11 are connected to the outer ends of the intake port 6 and the exhaust port 7, respectively.

In the intake passage 10, a throttle valve 12 for opening and closing the intake passage 10, a carburetor 13, and a supercharger 14 are sequentially arranged from the downstream side, and an air cleaner 15 is attached to the upstream end of the intake passage 10. .

The supercharger 14 is configured as a vane pump and is mechanically driven from the engine output section, and the carburetor 1
3 is configured in a variable venturi type.

An operating lever 20 is fixed to a rotating shaft 19 that is integrated with the throttle valve 12, and a wire 21 connected to an accelerator pedal (not shown) is connected to the operating lever 20.
is opened by driving the operating lever 20, and is closed by a return spring (not shown) when the accelerator pedal is released.

The intake passage 10 is provided with a bypass 16 that bypasses the supercharger 14, and the bypass 16 is provided with a bypass valve 17 that opens and closes it.

An interlocking mechanism 18 described below is interposed between the throttle valve 12 and the bypass valve 17, and when the throttle valve j2 is opened and closed, the bypass valve 17 is closed and opened via the mechanism 18. It has become.

Next, the interlocking mechanism 18 will be explained. The upper end of the operating lever 22 is rotatably supported on the rotating shaft 19, and the protrusion 20α integrated with the operating lever 20 of the throttle valve 12 receives the power to rotate the operating lever 200. An engagement pin 33 that transmits transmission to the operating lever 22 is provided in a protruding manner.

An opening/closing lever 23 is provided on the rotating shaft 24 that is integrated with the bypass valve 17.
is fixed, and its opening/closing lever 23 and bypass 16
A valve closing spring 25 made of a torsion coil spring is provided between the outer wall and the valve closing spring 25.
is provided, and the torsional force of the spring 25 applies a rotational force to the bypass valve 17 in the direction to close the bypass 16, that is, in the counterclockwise direction in FIG. In the vicinity of the bypass valve 17, the intermediate portion of the relay lever 26 is fixed to a rotating shaft 27, and a valve opening spring 28 made of a torsion coil spring is installed between the relay lever 26 and the support bracket 34 of the bypass 16.
is provided. Due to the torsional force of the valve opening spring 28, the relay lever 26 is given a rotational force in the counterclockwise direction in FIG. It is designed to open.

The lower ends of the operating lever 22 and the relay lever 26 are connected by a wire (or link) 30, and the operating lever 22 is rotated counterclockwise in FIG. A stopper 31 at the upper end of the lever 22 can be engaged with a stopper pin 32 on the outer wall of the intake passage 1o.

When the stopper 31 is engaged with the stopper pin 32 as described above, the engagement pin 33 of the operating lever 20 is separated from the operating lever 22, the bypass valve 17 is fully open, and the throttle valve 12 is closed at a predetermined angle. After that, the bypass valve 17 begins to close. Furthermore, during the opening process of the throttle valve 12, the bypass valve 17 is opened before the throttle valve 12 is fully opened.
is fully closed, and therefore, in the closing process of the throttle valve 12, when the valve 12 is closed by a predetermined angle from the fully open state, the bypass valve 17 starts to open.

Next, the operation of this embodiment will be explained. FIG. 4 shows the relationship between the opening degrees of the throttle valve 12 and the bypass valve 17 and the filling efficiency of the engine. Line A indicates that the bypass valve entire area is fully open, that is, the bypass valve 17 is open regardless of whether the throttle valve 12 is open or closed. This is a case where the engine is fully opened and supercharging is not performed, and line B
This is a case where the bypass valve area is fully closed, that is, the bypass valve 17 is fully closed regardless of whether the throttle valve 12 is opened or closed, and supercharging is always performed.

In engine idling, low load, and deceleration regions, the throttle valve 17 is opened at or slightly wider than the idling opening, and the engagement pin 33 of the operating lever 2° is spaced apart from the operating lever 22. , the operating force is not transmitted from the operating lever 20 to the operating lever 22, and therefore the relay lever 26 is rotated counterclockwise in FIG. Rotate the stopper 31 in the direction of the stopper pin 32
As a result, the bypass valve 17 is held fully open via the opening/closing lever 23.

Therefore, although the supercharger 14 is driven by the engine in this operating range, it only idles, thereby reducing the horsepower loss of the engine (points α to h in Figure 4).

In the high load region of the engine, when the operating lever 20 rotates clockwise in FIG. 1 in conjunction with the accelerator pedal and the throttle valve 12 opens by a predetermined angle, the engagement pin 33 of the operating lever 20 engages with the operating lever 22. and rotate it in the same direction. As a result, the relay lever 26 is rotated clockwise in FIG. 1 through the wire 30 against the torsional force of the valve opening spring 28, and at the same time, the bypass valve 1T is rotated counterclockwise in FIG. 1 by the torsional force of the valve closing spring 25. When the bypass valve 17 is rotated and closed in response to the opening of the throttle valve 12, the filling efficiency increases further, and when the bypass valve 17 is fully opened, the filling efficiency becomes the highest (between points b and C in Figure 4).

Next, the throttle valve 12 becomes fully open (FIG. 4d), and the upper end of the relay lever 26 touches the engagement pin 29 as shown in FIG.
More detached.

Thereafter, when the throttle valve 12 is opened by a predetermined angle by the operation opposite to that described above, the relay lever 26 is moved to the engagement pin 2 of the opening/closing lever 23.
9 and begins to open the bypass valve 17, and the bypass valve 1
After the throttle valve 7 is fully opened, the throttle valve 12 is fully closed.

In the above embodiment, the opening of the throttle valve 12 precedes the closing of the bypass valve 17, but the opening of the throttle valve 12 and the closing of the bypass valve 17 may be made to coincide.

As described above, according to the present invention, in a supercharged internal combustion engine in which a supercharger is disposed upstream of a throttle valve in the intake passage and is driven from the engine 1 lock j section, the supercharger is disposed in the intake passage. A bypass is provided to bypass the engine, and a throttle valve that closes and opens in conjunction with the opening and closing operations of the throttle valve is installed in the bypass, so the bypass valve is fully open during engine idling, low load, and deceleration regions. This allows the supercharger to idle, thereby reducing engine horsepower loss even if the supercharger continues to be driven.

In addition, since the bypass valve is fully opened before the throttle valve is fully opened, the turbocharger function can be reliably performed in the engine's high load range, increasing the engine's horsepower and improving drivability. can.

Furthermore, since the supercharging function of the supercharger is activated and stopped in a stepless manner, the switching shock can be reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall schematic diagram, FIGS. 2 and 3 are explanatory diagrams showing the opening and closing operations of the bypass valve, respectively, and FIG. 4 is an illustration of the throttle valve and the bypass valve. It is a graph showing the relationship between filling efficiency and opening/closing.

Claims (1)

[Claims] In an internal combustion engine in which a supercharger driven by an engine opening force section is disposed upstream of a throttle valve in an intake passage, a bypass for bypassing the supercharger is provided in the intake passage, and the throttle valve is connected to the bypass in the intake passage. A supercharger control device for an internal combustion engine, which is provided with a bypass valve that closes and opens in conjunction with the opening and closing operations of the throttle valve and is fully closed before the throttle valve fully opens.