JPS63306252A - Multiple throttle unit for internal combustion engine - Google Patents

Abstract

PURPOSE:To improve function of multi-cylinder engine by arranging a solenoid valve in the way of a tube coupling between one end of hole communicating through downstream of respective throttle valves and the upstream of the throttle valve. CONSTITUTION:Balance holes 8, 8' are made between communication holes 9, 9' and throttle bodies 1, 1' in order to absorb rattling of shafts 5, 6 and fixing error of throttle valves 2, 2', 3, 3'. A collection tube 10 is added to the balance holes 8, 8' and a solenoid valve 11 is arranged at the upstream side. Bypass air quantity is controlled with open valve time interval of the solenoid valve 11. Consequently, response and output are improved, resulting in improvement of engine function.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multiple throttle device for an automobile engine.
In particular, the present invention relates to an air amount control device suitable for controlling air flow rate.

[Conventional technology]

Fuel injection systems, which have grown in popularity on the promise of improved output, still have room for improvement in terms of transient response due to the presence of a volume section located downstream of the transfer valve. To deal with this problem, Torikaisho Gi-140141 proposes a multiple throttle valve, but due to the relationship between the throttle valve and the amount of accelerator depression, there is a method for adjusting the amount of air between each cylinder, especially at low engine speeds. has not been disclosed.

[Problem that the invention seeks to solve]

In the above conventional technology, in the case of multiple throttles, the increase in the opening area with respect to the throttle opening is larger than in the case of a conventional single throttle, so adjustment in the low opening range is sensitive and becomes a bottleneck for practical use. .

To solve this problem, in the region where the throttle opening is small, the air volume measurement ratio is reduced by the opening of the throttle valve, and an electromagnetic solenoid valve is used that intermittently opens and closes this air volume by introducing air into the auxiliary passage. We propose a control method.

[Means for solving problems]

The disadvantage of the multiple throttle system is that the increase in air volume is too large in response to changes in the throttle valve opening, and the problem is
The air volume setting is too loud. Therefore, in this case, the problem is solved by controlling the amount of bypass air in the low speed range of the engine, and controlling the amount of air with the throttle valve opening when the engine speed increases.

[Effect]

The amount of bypass air is controlled by the opening time width of the solenoid valve.

This valve opening time width is the engine rotation speed N.

It is determined by the opening degree θ of the throttle valve, and these N, 0
When the N is below a certain value, the electromagnetic valve is activated and these N
, θ exceeds a certain value, the operation of the electromagnetic valve is stopped and the amount of air is measured by the throttle valve opening.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Each throttle body 1, 1' has two throttle valves 2, 2'.
and 3,3', and downstream outlets 4.4 of these throttle valves.
', 4'' and 4#' are connected to the intake port (not shown) of each engine. Throttle valves 2, 2' and 3, 3
' is opened and closed by the shaft 5' being rotated by a lever 12 which rotates in accordance with the amount of depression of an accelerator pedal (not shown), and at the same time, the links 7 and 7' shaft 6 are rotated.

In the case of a multiple throttle, the amount of air flowing downstream of each throttle valve is determined by the backlash of the shafts 5 and 6, the throttle valve 2゜2', 3.3
To absorb these errors, the communication holes 9, 9' and the throttle body 1
, 1' is a standard practice to provide a balance hole 8° 8' between the holes. In the present invention, a collecting pipe 10 is added to the balance holes 8, 8', a solenoid valve 11 is installed on the upstream side thereof, and a pipe 21 upstream of the collecting pipe 10 is connected to the intake pipe 10 upstream of the throttle valve.
Connected to 4. The electromagnetic valve 11 is controlled based on commands from a controller, which will be described later.

Figure 2 shows a modification of the case shown in Figure 1, with the throttle body 1
This is the case when four throttle valves 2.2', 2' and 2"' are installed in the throttle valve 2.2'.

A collecting pipe 10 is installed downstream of 2′ and 2″′ on the upstream side of the communication hole.
A solenoid valve 11 is provided to control the amount of air flowing into the collecting pipe 10. The example shown in FIG. 2 has a simpler structure than the case shown in FIG. 1 because the number of link parts is reduced.

FIG. 3 schematically shows the overall structure when installed in an engine 21 with multiple throttles opened.

The engine 12 has a throttle body 1. An air amount sensor 15 is installed upstream of the intake cylinder 14. Air cleaner 16 is installed. Furthermore, an exhaust pipe 19 is attached to the engine 12,
An air-fuel ratio sensor 20 is attached to the collecting part of the exhaust pipe 19.

Here, multiple throttles 2.2', 2' and 21' shown in FIG. 2 are attached to the throttle body 1,
A throttle valve opening sensor 13 is added to this to detect the throttle valve opening. In addition, each intake boat has two injection valves.
2.22'22' and 22'' are provided, respectively;
Throttle valve 2.2'.

A communication hole 8.8" communicates the downstream sides of 2" and 2"'.

9.9', and the collecting pipe 10 upstream of these communication holes
An electromagnetic valve 11 is installed in and connected to a pipe 21 that communicates with the intake cylinder 14.

Here, the electromagnetic valve 11 includes an air amount sensor 15, a rotation speed sensor 17 that detects the rotation speed of the engine 12, a throttle valve 2. The signal from the throttle valve opening sensor 13 that detects the opening is guided to the control 18, where it is calculated and controlled.

An example of a method of controlling the electromagnetic valve 11 at this time is shown in FIG. Engine speed N.

The throttle valve opening degree O is detected, and this signal is compared with the value stored in the aforementioned controller 18, and the detected value is compared with the preset rotation speed No. and the throttle valve opening degree θ0, and the setting is made. When the value is smaller than the set value, the electromagnetic valve is operated, and when it is larger than the set value, the operation of the electromagnetic valve is stopped.

The electromagnetic valve 11 opens and closes at regular intervals depending on operating conditions, and the opening time width is further controlled.

〔Effect of the invention〕

According to the present invention, it is possible to improve the response and output of the multiple throttle system, but it is also possible to avoid the disadvantage of poor air volume controllability in the low rotation range, thereby making a significant contribution to improving engine performance.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a specific embodiment of the multiple throttle system according to the present invention, FIG. 2 is a diagram showing another embodiment of FIG. 1, and FIG. 3 is a configuration diagram when installed in an engine. FIG. 4 is a diagram showing an example of specific control of turning on and off the operation of the electromagnetic valve of the multiple throttle. 1... Throttle body, 2... Throttle valve, 3
... Throttle valve, 4... Outlet, 5... Shaft, 6... Shirt 1~. 7... Link, 8... Communication hole, 9... Communication hole. 7i 2Z Fig. 3/S・-q Air volume 16---Air 2 Nona 17・-times Shoe Hidensa

Claims (1)

[Claims] 1. In a multi-cylinder engine, a multiple throttle system in which one throttle valve is provided per cylinder has a hole that communicates downstream of each throttle valve, and one end of this hole is connected to the upstream side of the throttle valve by a pipe, and the pipe Place a solenoid valve in the middle of the
A multiple throttle device for an internal combustion engine, characterized in that the operation of the electromagnetic valve is controlled according to the engine speed and the opening degree of the throttle valve, which are stored in advance in a storage device, in accordance with the operating conditions of the engine.