JPS6039861B2 - Intake device for multi-cylinder engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake device for a multi-cylinder engine.

For multi-cylinder engines, the number of operating cylinders is increased or decreased depending on the operating condition. For example, in a 3-cylinder engine, when idling or under light load, only one cylinder is operated, and the number of operating cylinders is increased or decreased depending on the operating condition.
Some systems operate with two cylinders under moderate loads, and operate with all three cylinders under higher loads to maintain the optimum air supply ratio at all times, thereby improving fuel efficiency.

In such a multi-cylinder engine, in order to achieve the above technical concept, a control valve is generally provided in a part or all of the intake manifold, and the control valve is controlled by the opening of the throttle valve. We are trying to open the valve accordingly. but,
In all of these, the relationship of the control valve is made to correspond to the opening degree of the throttle valve, so for example, as shown in FIG.
, 23 pass through the irregular combustion range, an unstable castle exists only within the throttle valve opening range x.

If the vehicle is driven continuously within this range x, an unpleasant shock occurs in the vehicle, which has the disadvantage of impairing the riding comfort. The purpose of the present invention is to provide an intake device for a multi-cylinder engine that does not impair the ride feeling and avoids wasteful consumption of fuel. and an interlocking mechanism for interlocking the control valve with the opening/closing operation of the shark valve; and an interlocking mechanism for interlocking the control valve with the opening/closing operation of the shark valve; a negative pressure sensitive means for opening and closing a control valve by the negative pressure sensitive means; and an operating mechanism for opening and closing a control valve by the negative pressure sensitive means; the valve, and the negative pressure in the intake pipe equipped with the specific control valve, which increases with the opening of the throttle valve and the specific control valve, is detected by the negative pressure sensitive means and the operating mechanism is actuated. , at least one of the remaining control valves is opened instantaneously at a constant rate, and thereafter, the interlocking mechanism moves the remaining control valve with the throttle valve according to the opening state of the throttle valve. The reason is that the valve was made to open.

The present invention will be described below with reference to embodiments shown in the drawings.

In the embodiment shown in FIG. 2, each intake pipe 1, 12, 13
The control valves 2, 22, 23 are arranged in the control valve 2, and are linked with the throttle valve 3 in a manner to be described later.

The throttle valve 3 has a throttle lever 5 fixedly connected to its shaft 4.
、、Connected to the upper end of the throttle lever or punch 6
It is linked to an accelerator pedal (not shown) via. Control valves 2, 22, and 23 are all normally closed, and control valve 2 is closed momentarily when the engine is idling, and control valves 22 and 23 are closed momentarily when throttle valve 3 is at a constant rate. The structure is such that a constant relationship (a relationship exceeding the irregular combustion range Q) is established. That is, the control valve 2 disposed in the intake pipe 1 is always urged open by a tension spring 7, and is opened by an interlocking lever 9 interlocked with the throttle valve 3 via a rod 8. ,
Alternatively, the negative pressure actuator 10 is opened by the negative pressure actuator 10, and the idle operating state of the engine is detected. Similarly, the control valve 22 is always energized to close by the tension spring 72, and the throttle valve 3 is adjusted to open at a constant speed (when the engine is running at a medium speed). At this time, the negative pressure actuator 102 is operated to open the control valve 22 to a certain degree (an opening degree exceeding the irregular combustion range Q), and then the shark valve 3 is Similarly, the control valve 23 is always urged to close by a tension spring 73, and when the throttle valve 3 is at a constant level (high-speed engine operation). , the negative pressure actuator 103 is operated to open the control valve 23 to a certain degree (a degree exceeding the irregular combustion range o), and then the rod 83 and the interlocking lever 9 are opened.
It is adjusted to open in conjunction with the throttle valve 3 via the throttle valve 3. FIG. 3 shows specific means for causing the control valves 2, 22, 23 to perform the above operations.

This means is achieved by fixedly connecting the lever 12 to the shaft 11 of the control valve 2, and furthermore, the interlocking lever 9 and the quick-acting lever 13 are attached to the shaft, and the interlocking lever 9 and the quick-acting lever 13 are rotated counterclockwise. Only when rotating, the control valve 2 is brought into abutting engagement with the lever 12 to operate the control valve 2 in the opening direction. Quick actuation lever 13 connects Oribe to negative pressure actuator 101 via rod 14 . Therefore, the control valve 2 is always biased clockwise (closing direction) by the tension spring 7 via the lever 12 and shaft 11, and when the negative pressure actuator 10 is actuated, the quick-actuation lever 13 is rotated counterclockwise. Then, the lever comes into contact with the lever 12, and then the lever 12 is rotated counterclockwise to instantaneously set the control valve 2 to a constant opening. (See FIG. 40) The operating force from the accelerator pedal transmitted to the movement lever 9 through the rod 8 rotates the lever counterclockwise, causing the lever to come into contact with the lever 12, and then The control valve 2 is moved with the shark valve 3 by rotating the control bar 12 counterclockwise (see FIG. 4m). In the embodiment shown in FIG. 2, the pressure chamber 15 of the negative pressure actuator 10 is connected to the downstream side of the control valve 22 in the intake pipe 12 via the switching valve 16. The pressure chamber 15 is opened to the atmosphere, and the idling operating state is confirmed by an appropriate means such as detecting the engine rotational speed, and the pressure chamber 15 and the intake pipe 1 are
2 and the downstream of the control valve 22 at 2.

In addition, each pressure chamber 1 of the negative pressure actuator 102, 103
52 and 153 are connected to the upstream side of the control valves 2 and 22 in the intake pipes 1 and 12, respectively. The operation of the above embodiment will be explained below, and the configuration will also be explained in detail.

First, when the engine is in an idling operating state, the pressure chamber 15 of the negative pressure actuator 101 is connected to the downstream side of the control valve 22 in the intake pipe 12 via the switching valve 16. Therefore, negative pressure from the intake pipe 12 acts on the pressure chamber 15 of the negative pressure actuator 10, and the control valve 2,
is related to a certain opening degree (opening degree exceeding the irregular combustion range Q).
In such a state, the negative pressure in the intake pipe 1 is not so large that the negative pressure actuator 102 is not actuated, and similarly, almost no negative pressure is generated in the intake pipe 12, so Negative pressure actuator 103 also does not operate. Therefore, the air-fuel mixture is drawn into the engine only through the intake pipe 1. Subsequently, the shark valve 3 is opened, and in conjunction with this, the control valve 2 is also opened, and when the engine enters a mid-range operation state, the negative pressure inside the intake pipe 1 increases, and its negative pressure actuator 102 is activated. , the control valve 22 has a certain relationship (a relationship exceeding the irregular combustion range Q).

Furthermore, when the throttle valve 3 becomes closed, not only the control valve 2 but also the control valve 22 become involved, and the engine enters a high-speed operating state. Therefore, in the same aircraft as above, the negative pressure inside the intake pipe 13 increases, and the negative pressure causes the negative pressure actuator 103 to increase.
is operated, and the control valve 23 opens to a certain degree (a degree exceeding the irregular combustion range Q). Thereafter, control valves 2, 22, and 23 are all opened depending on the degree of throttle valve 3. The graph in FIG. 10 shows such characteristics. From this state, when the accelerator pedal is gradually released, each control valve 2, 22, 23 follows the operation opposite to the above, sequentially closing the control valves 23, 22, and finally the shark valve is closed. 3. When the opening becomes small and the engine enters an idling state, the switching valve 16 is operated to operate the negative pressure actuator 10 of the intake pipe 12 and maintain the control valve 2 at a constant opening. As explained above, the present invention provides a control valve in each intake pipe of a multi-cylinder engine, thereby increasing the number of cylinders in use according to idling, low-medium speed, and high-speed operation, and all control valves during deceleration. The basic technical idea is to bring the device into a fully closed state, and in addition to the above-mentioned embodiments, various aspects can be explored within the scope of the claims.

For example, as shown in FIG. 5, each pressure chamber of the negative pressure actuators 10'2, 10'3 is
The control valves 2, 22 may be connected to the downstream side of the control valves 2, 22. In this case, negative pressure actuators 10'2, 10'3
indicates the direction in which negative pressure acts on the diaphragm and the biasing direction of the compression spring in the negative pressure actuator 1 of the above embodiment.
Reverse the case of 02 and 103, and connect the intake pipe 1. , 12 becomes small, the negative pressure actuators 10'2, 10
'3 should be activated. In addition, intake pipe 1
, a negative pressure actuator 10'. Since it is sufficient to maintain the control valve 2 at a constant opening when the engine is idling, the negative pressure actuator 10' is used as a stopper as shown in Fig. 6, and the pressure chamber 15' is opened. Control valve 22 of intake pipe 12
The setting pressure of the compression spring can be determined so that the spring passes through the spring on the downstream side of the spring, and the set pressure of the compression spring is not activated by the negative pressure during idling, but is activated by the negative pressure (the negative pressure increases) during deceleration. As described above, the intake system for a multi-cylinder engine according to the present invention instantaneously exceeds the asymmetric combustion range and opens at the initial stage of the control valve, so it provides excellent riding feeling and also prevents the engine from decelerating. In this case, the control valve is fully closed, so wasteful fuel consumption can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the characteristics of a conventional multi-cylinder engine equipped with a control valve, FIG. 1 is a graph showing characteristics of a multi-cylinder engine according to the present invention, and FIG. Conceptual plan view showing the intake device of a cylinder engine, Fig. 3 1
3 is a partial cross-sectional view of the same, FIG. 4 is a vertical cross-sectional view showing the operating mode, and FIG. FIG. 6 is a partial vertical cross-sectional view showing another embodiment for maintaining the control valve at a constant opening in the idling state. 11, 12, 13... Intake pipe, 2,, 22, 23...
... Control valve, 3 ... Throttle valve, 4 ... Shaft, 5, ... Throttle lever, 52, 53 ... Lever,
6... Link village, 7,, 72, 73... Tension spring, 8..., 82, 83... Rod, 9, 92,
93... Interlocking lever, 101, 102, 103...
Negative pressure actuator, 11... shaft, 12,,1
22, 123...Lever・131, 132, 133
...Quick action lever. Figure 1 Figure 2 Figure 3 Figure 5 Figure 4 Figure 6

Claims (1)

[Claims] 1. In a multi-cylinder engine that supplies air-fuel mixture from one throttle valve to each cylinder via an intake manifold, a control valve is disposed in each intake pipe of the manifold so as to be normally closed, and an interlocking mechanism that links the control valve with the opening and closing operations of the throttle valve; a negative pressure sensitive means in the intake pipe that operates by detecting a negative pressure state in another intake pipe; and a negative pressure sensitive means that opens and closes the control valve. an actuation mechanism is provided, one specific control valve among the control valves is opened by the operation of an interlocking mechanism accompanying the opening of the throttle valve, and the valve increases as the throttle valve and the specific control valve open; By detecting the negative pressure in the intake pipe equipped with the specific control valve with the negative pressure sensing means and activating the operating mechanism, at least one of the remaining control valves is opened instantaneously to a constant opening degree. At the same time, the interlocking mechanism thereafter opens the remaining control valves in conjunction with the throttle valve in accordance with the opening state of the throttle valve.