JPS62291429A - Supercharging device for engine - Google Patents

Abstract

PURPOSE:To extend the life of, and improve the reliability of an intake air exciting device through permitting the intake air exciting device to function only in case of necessity by providing an intake air exciting device in an intake air passage, and then, when the engine is in the low-load operating range, causing a control valve to close so as to make the intake air exciting device inoperative. CONSTITUTION:There is provided an intake air exciting device 20 in an intake air passage 11 which is made up of each of the independent exhaust air passages 5A-5D and an intake air main passage 6. In addition, in the intake air exciting device 20 is provided a positive displacement part 21, whose one side is connected to the intake air passage 11, and the other side is connected by means of a pressure conduit tube 10 to an exhaust air passage 12. And further, within the positive displacement part 21 is provided a partition 24, which is supported with a spring 26 and provided with a bellows member 25 on its surroundings, so that the inside of the positive displacement part 21 is partitioned into an intake air chamber 22 which is connected to the intake air passage 11 side and an exhaust air passage 23 which is connected to an exhaust air passage 12 side. While, in the pressure conduit tube 10 is provided an opening and closing control valve 19, and then, the opening and closing control valve 19 is kept closed when the engine is in the low-load operating range, and caused to open gradually as the throttle opening increases.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an engine supercharging device.

(Prior art) Conventionally, in engines, attempts have been made to improve the engine output by increasing the filling efficiency of the intake air by using the dynamic effect of the intake air, but this dynamic effect alone is not enough. A sufficient supercharging effect cannot be obtained because the level of pressure waves generated in the intake passage is relatively small.For this reason, as disclosed in, for example, Japanese Utility Model Application Publication No. 185027/1983, the exhaust pulsation of the engine is reduced. An attempt has been made to provide an intake air excitation means in the intake air passage, which has a partition wall that vibrates in response to vibrations, to vibrate the intake air by the vibration of the partition wall, to obtain a large pressure wave, and thereby to increase the intake air filling efficiency. There is.

By the way, in this way, the partition wall is vibrated by exhaust pulsation,
In this way, in the intake air vibrator that vibrates the intake air, due to its structure, fatigue of the vibrating part including the partition wall progresses quickly, and the life of the intake air vibrator is comparatively long! 1. For τ; +1 and -, it is necessary to ensure improved reliability by extending the life of the intake vibration excitation device.

However, in the above-mentioned known example, since the partition wall is provided directly facing the exhaust passage, the vibration action is continuous during engine operation, regardless of whether vibration is necessary or not. However, it cannot be said that the life span of the intake vibration excitation device is taken into account.

(Object of the Invention) The present invention is intended to solve the problems pointed out in the above-mentioned section of the prior art. The purpose of this invention is to extend the life of the intake vibration excitation device and improve its reliability.

(Means for Achieving the Object) As a means for achieving the above object, the present invention provides an engine equipped with an intake passage connected to an intake port of a cylinder and an exhaust passage connected to an exhaust port of a cylinder. In,
In the intake passage, a volume part having a predetermined volume is divided into two chambers separated from each other by a partition wall that can vibrate in response to pressure pulsations. Further, an intake vibration excitation device is provided in which the other chamber is connected to the exhaust passage through a pressure conduit so that the intake air is excited by the pulsation of the exhaust pressure through the partition wall. A control valve for controlling opening and closing of the pressure conduit is provided between the intake vibration excitation device and the exhaust passage, and the control valve is configured to be closed at least in a low-load operating region of the engine.

(Function) In the present invention, by using the above means, the control valve is closed and the intake vibration device is inoperable in a low-load operating range where a large amount of engine output is not required, so that the output characteristics of the engine are almost completely impaired. Therefore, it is possible to shorten the operating time of the intake air vibration device relative to the total operating time of the engine, that is, to reduce the cumulative number of vibrations of the partition wall.

(Example).

Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows an intake/exhaust system diagram of a four-cylinder automobile engine equipped with a supercharging device according to an embodiment of the present invention, and in the figure, reference numeral I designates the engine body. Four cylinders 2 A, 2 B, 2 C, 2 of this engine body 1
D each intake port 3A, 3B.

3C and 3D have independent intake passages 5A and 5r3, respectively.
゜5C and 5D are connected. Each independent intake passage 5
A, 5B, 5C, and 5D are gathered together by a main intake passage 6 on the upstream side thereof, and together with the main intake passage 6 constitute an intake passage 11. Furthermore, an air flow meter 15 and an air cleaner 1 are installed at the most upstream position of this intake passage 11.
6 also includes the air flow meter I5 and the air cleaner 1.
6 and the independent intake passage 5A, 513.5
A throttle valve 17 is installed immediately upstream of the collecting part of C and 5D.
are provided for each.

On the other hand, each exhaust bow of each cylinder 2A, 2B, 2C, 2D 1
-71 A, 4 B, A C,, 1rlft
-Some 1. ? ! ”, July air passage 7 in S
Δ, 7B, 7C, and 7D are connected.

Each independent exhaust passage 7A, 7B, 7C, 7D is
On the downstream side thereof, they are gathered together by a main exhaust passage 8, and together with the main exhaust passage 8, constitute an exhaust passage 12.

Further, in this embodiment, by applying the present invention, an intake vibration device 20, which will be described later, is provided in the intake passage 11. This intake vibration device 20 has a predetermined volume, and has one side communicating with the intake passage 11 and the other side communicating with the exhaust passage I2 via the pressure conduit 1o. It is equipped with 21. A partition wall 24 having a bellows member 25 around it is fitted into the volume portion 21 and is elastically supported by a spring 2G. The bellows section 25 divides the chamber into two chambers: an intake chamber 22 communicating with the intake passage 11 and an exhaust chamber 23 communicating with the exhaust passage 12 via the pressure conduit 10.

If the intake/exhaust system is constructed in this way and the intake vibration device 20 is provided facing the intake passage I1, the dynamic effect of the intake air itself in the intake passage IL and the intake vibration vibration device 2 will be
A higher level of supercharging effect can be obtained by the synergistic effect with the intake air vibration effect caused by zero. That is, by appropriately setting the length of the intake passage +1, the intake chamber 2 of the intake vibration device 20
2 functions as a pressure reversal section, and an intake pulsation is generated in the intake passage II due to the dynamic effect of intake air, that is, due to the ringing effect. The exhaust pulsation introduced into the exhaust chamber 23 through the oscillation causes the intake air in the intake passage 11 to vibrate. This is amplified by the vibration action of the vibration device 20, resulting in a higher peak pressure and a pressure pulsation.This high intake air pulsation pressure increases the intake air filling efficiency and realizes high output operation of the engine.

By the way, the intake vibration by this intake vibration vibration device 20 is as follows.
Since this is done by vibrating the bulkhead 24 due to exhaust pulsation in a double series manner, if this is done continuously during the entire operation of the engine, fatigue of the single culm wall 24 or the bellows member 25 will rapidly progress. As mentioned above, there is a concern that the life of the intake vibration excitation device 20 will be shortened due to these damages, and that its reliability will be reduced.

However, in part B of this embodiment, the present invention is applied to provide a control valve 19 for opening (closing) the passage in the two-legged pressure conduit lO, but the operation of this control valve 19 is controlled as shown in FIG. As shown by the curve σ, in the low throttle opening range below the throttle opening α, that is, in the low load operating range of Ennon, the control valve 19 is kept open, and the throttle opening α is kept open.
In the above-mentioned high throttle opening range, that is, in the high load operating range of the engine, the throttle opening is increased and the valve is gradually opened to the full open position. In FIG. 1, reference numeral 30 is a controller, and the controller 30 sends a control signal to the actuator 32 of the control valve I9 in response to a throttle signal S1 input from the throttle opening sensor 31. S, and actuates the actuator ν32 to open and close the control valve 19.

When the operating characteristics of the control valve 19 are set in this way, as shown by curve 1 in FIG. In contrast, in the high-load operation region of the engine where high output is required, the intake vibration device ρ20 is not activated, and the supercharging is performed by the synergistic effect of the dynamic effect and the vibration effect. It becomes possible to supercharge the water and obtain high output. That is, the influence of the reduction in engine output performance due to the stoppage of the intake vibration device 20 is minimized, and the intake vibration device 20 continues to operate excellently for +1!7, that is, the intake vibration device 20 It becomes possible to reduce the number of vibrations of the vibrating part. As a result, compared to the case where the intake vibration exciter 20 is operated throughout the entire operating range of the engine, the intake vibration
20's 71 life can be extended, and the reliability of the intake vibration exciter 2Q will be improved accordingly.

In addition, in FIG. 2, the curve I1. is a torque curve when the intake vibration excitation device 20 is inactive, that is, when there is no vibration effect, and curve 7. is a torque curve when the intake vibration excitation device 20 is operated through the entire throttle opening range.

By the way, in the case where the opening characteristic of the control valve 19 is set to, for example, a valve opening characteristic that opens from the throttle opening to full throttle, According to Figure 2, the curve l-1+, tl= is connected to point a and point b.
- A large torque fluctuation occurs at the position where the throttle opening α moves from point C to point d; Since the engine torque is set to gradually open, the engine torque changes smoothly as shown by the curve Lo in Fig. 2, and the torque jerk as in the case 1 does not occur, but the driving feeling is 4 tons better. You can get it.

(Effects of the Invention) The engine supercharging device of the present invention is an engine including an intake passage connected to an intake port of a cylinder and an exhaust passage connected to an exhaust port of a cylinder.
If the volume part has a predetermined volume and is divided into two chambers H1 which are isolated from each other by a partition wall that can vibrate in response to pressure pulsations, one of the chambers is connected to the intake passage and the other An intake vibration excitation device is provided in which the chamber is connected to the two-leg exhaust passage through a pressure conduit so that the intake air is excited by the pulsation of the exhaust pressure through the partition wall, and The present invention is characterized in that a control valve for controlling opening and closing of the pressure conduit is provided between the vibration device and the exhaust passage, and the control valve is configured to be closed in a low-load operating region of the engine.

Therefore, according to the engine supercharging device of the present invention, the control valve is closed and the intake vibration device is deactivated in the low-load range where engine output is not required so much, so that the engine output characteristics can be improved. This promotes a reduction in the operating time of the intake air vibrator relative to the total operating time of the engine, that is, a reduction in the cumulative number of vibrations of the bulkhead, with little loss, resulting in an extended life of the intake air vibrator and its reliability. The effect is that the performance is improved and the quality is improved.

[Brief explanation of the drawing]

FIG. 1 is an intake/exhaust system diagram of an engine equipped with a supercharging device according to an embodiment of the present invention, and FIG. 2 is a control characteristic diagram and a torque curve diagram of a control valve in the engine shown in FIG. 1. 1...Engine body 2A-2D...Cylinder 3A-3D...Intake port 48-4D...Exhaust port 5A-5D...Independent intake passage 6 ...Intake main passage 7A to 7D ...Independent exhaust passage 8 ...Exhaust main passage IO...Pressure conduit 11 ...Intake passage 12 ... Exhaust passage 17...Throttle valve 19...''Control valve 20...Intake vibration device 21...Volume section 22...Intake chamber 23...・Exhaust chamber 24 ..... Partition wall 25 ..... Bellows member 26 ..... Spring α Fully open throttle opening

Claims (1)

[Claims] 1. In an engine equipped with an intake passage connected to an intake port of a cylinder, and an exhaust passage connected to an exhaust port of a cylinder, the intake passage has a volume portion having a predetermined volume, and the volume portion has a predetermined volume. The partition wall is divided into two chambers separated from each other by a partition wall that can vibrate in response to pressure pulsations, and one of the chambers is communicated with the intake passage and the other chamber is communicated with the exhaust passage via a pressure conduit. An intake vibration excitation device is provided in which the intake air is excited by pulsation of exhaust pressure through the pressure conduit, and a control valve for controlling opening and closing of the pressure conduit is provided between the intake vibration vibration device and the exhaust passage. A supercharging device for an engine, characterized in that the control valve is configured to close at least in a low load operating region of the engine.