JPH01110847A - Idling controller for internal combustion engine - Google Patents

Abstract

PURPOSE:To improve responsiveness of the intake air of an engine by connecting the outlet of a bypass passage having an adjusting means for the bypass air quantity, to an intake manifold. CONSTITUTION:The bypass passage 13 of an intake manifold 7 is connected to the bypass passage 12 of a surge tank 6, and a check valve 14 is installed in the outlet, and the spring pressure is set to the pressure corresponding to the pressure in the surge tank 6 in the ordinary idling. Therefore, in an intake process, the check valve is opened to permit the inflow of air into an engine 9, while in other process, the inflow of air is suppressed, and the responsiveness in the reduced quantity side control of the air quantity can be improved. An air quantity adjusting means 5 is driven according to the judgement from the engine revolution speed by a control circuit 11, and when the revolution speed reduces, the air quantity is increased, and the suction rate of the engine is increased, and responsiveness is improved. When the increase of the engine revolution speed is detected, the charge quantity of the surge tank 6 is reduced, and responsiveness can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a phytolinda control device for an internal combustion engine having a surge tank.

[Conventional technology]

FIG. 6 is a cross-sectional view of a conventional idling control device described in, for example, Japanese Patent Application Laid-Open No. 59-162340. In FIG. , 2 is a throttle valve, 3 is a throttle valve provided in the throttle sensor 2,
4 is a pi-gas air passage, 5 is a means for adjusting the amount of bypass air provided in this passage 4, 6 is a surge tank provided on the downstream side of the throttle on day 2, and 7 is an intake manifold.

8 is an injector attached to the intake manifold 7 for each cylinder, 9 is an engine, and 10 is an intake valve.

Reference numeral 11 denotes a control circuit which drives the injector 8 with a predetermined O injection pulse width based on input signals from a rotation speed detection means (not shown), an air flow sensor, a water temperature sensor, a throttle sensor, etc. 9. Controls the air amount adjusting means 5.

Next, the operation of controlling the amount of air during idling will be explained. Note that the bypass air amount adjusting means 5 uses a linear solenoid. Now.

When idling, the pressure inside the surge tank 6 is usually -50
018EIF Ashi Wado, Pai! The air flow through the air passage 4 is related to the opening area of the near solenoid and the differential pressure between atmospheric pressure and the pressure inside the surge tank 6. Throttle valve 3f: fills the surge tank 6 with the air flow passing through it. . The engine 9 then sucks the air in the surge tank 6 into the cylinder during the intake stroke. Normally, air control during idling is performed to maintain a predetermined engine speed. For example, if the engine speed decreases due to an electrical load such as a headlight, the control circuit 11 increases the air flow rate to increase the engine speed. Increase the opening area of the linear solenoid so that

[Problem that the invention seeks to solve]

Since the conventional idling control device is configured as described above, even if the time to increase the opening area of the linear solenoid is short, it takes time to fill the surge tank 6, and the There were problems such as poor responsiveness of the air actually taken into the cylinder, and a delay in recovery when the engine speed decreased. Particularly in recent engines, there is a tendency to lower the moment of inertia of the engine in order to improve response and lower fuel consumption, and this has encouraged a decrease in engine speed due to electrical loads and the like.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain an idling control device for an internal combustion engine that can improve the responsiveness of intake air to the engine.

[Friendly means to resolve issues]

The idling control device according to the present invention connects the outlet of a bypass passage having a pi-gas empty means to an intake manifold.

[For production]

In this invention, since the outlet of the bypass passage is connected to the intake manifold, the rate at which the surge tank is filled with air from the bypass passage can be suppressed, and the intake air response of the engine is improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a cross-sectional view of the idling control device according to the present invention, and numerals 1 to 11 are shown in Figure @6 and are the same as the nine conventional devices. 12 is a bypass passage for the surge tank 6 connected to the bypass passage 4; 13 is a passage for this paddle passage 1;
2, the outlet of this bypass passage 13 corresponds to each cylinder of the intake manifold 7, and is connected to the engine 9.
11. Reference numeral 14 designates nine check valves provided within the outlet of each of the bypass passages 13.

FIG. 2 is an external view of the piston passage 12, with one passage on the upstream side and nine branches on the downstream side corresponding to each cylinder of the intake manifold 7.

Figure @3 is a cross-sectional view of the check valve 14, which has a known configuration consisting of a bearing 15 and a spring 16 for opening and closing the valve 14&. I! Figure 4 shows the operation diagram of the check valve 14,
The horizontal axis shows time and engine stroke, and the vertical axis shows pressure. The spring pressure of the check valve 14 is set to pg, which corresponds to the pressure in the surge tank 6 during normal idling. As a result, in the intake stroke, the lower fill pressure becomes less than pm, and the check valve 14 opens, allowing air to flow into the engine 9 from the bypass passage 13. Also, other journeys (
(compression, 51 shots, exhaust), the downstream pressure of the check valve 14 becomes more than pm, and the pulp 14 is pasted and the bypass passage 1
There is no air inflow from engine 3 to engine 9. Accordingly, the responsiveness of the control on the reduction side of the air amount can be improved.

FIG. 5 is a time chart of the operation according to this invention,
Chart 1 particularly shows the operation of the electrical load when a load is applied to the engine 9, and the electrical load is turned on at time 11 and turned off at time t3.

Chart 3 shows the behavior of the engine rotational speed at this time, where the broken line is the behavior of the conventional example and the solid line is the behavior according to the present invention.

Chart 2 shows the operation of the amount of air sucked into the engine 9 as determined by the control circuit 11 from the engine speed and drives the adjusting means 5 for adjusting the amount of air in the exhaust gas, and the broken line indicates the operation of the conventional example. .

The solid line indicates L production according to this invention. That is, 1 time t2
The adjustment means 5 is driven to increase the amount of air by determining a drop in the engine speed.

In this invention, the proportion of air taken into the engine from the adjusting means 5 is higher than in the conventional example, and as shown in Chart 2, the response is improved. Even when an increase in the engine speed is detected at time t4, the present invention improves responsiveness because the surge tank 6 is filled with less k.

In addition, in the embodiment, the bypass air amount regulator 5 is connected to the intake manifold 7 via the pipe gas passage 12 on the downstream side, or is connected directly to the pipe/gas passage 12i4.
and the intake manifold 7. Also,
Although the adjusting means 5 is integrated with the throttle body 2, it may be separated from the throttle body 2 and installed side by side.

〔Effect of the invention〕

As explained above, according to the present invention, the outlet of the No.9/9th passage having the means for adjusting the amount of bypass air is connected to the intake manifold, so that the rate at which the air from the bypass passage fills the surge tank can be suppressed. It is possible,
This can improve the responsiveness of the intake air of the engine.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an idling control device according to an embodiment of the present invention, Fig. 2 is an external view of a bypass passage of a surge tank, Fig. 3 is a sectional view of a check valve, and Fig. 4 is an explanation of the operation of the check valve. 5 is a time chart diagram explaining the present invention in detail, and FIG. 6 is a sectional view of a conventional idling control device. 316. 9 valves of throttle, 4+1. bypass passage, 510. Adjustment means for Pi/Yasu 9ki, 6... Surge tank, 7.
...Intake manifold, 9...Engine,
DESCRIPTION OF SYMBOLS 1... Control circuit, 12... Surge tank bypass passage, 13... Intake manifold high nose i[, 14... Check valve. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) An idling control device for an internal combustion engine having a surge tank, which has a bypass passage for air from the upstream side to the downstream side of the throttle valve, and a means for adjusting the amount of bypass air in this bypass passage, and has a bypass passage for adjusting the amount of bypass air. An idling control device for an internal combustion engine, characterized in that an outlet is configured to communicate into an intake manifold of each cylinder. (2) A check valve according to claim 1, characterized in that a check valve whose pressure is adjusted so as to communicate the air passage only during the intake stroke of the engine is provided in the passage divided into each cylinder of the bypass passage. Internal combustion engine idling control device.