JPS605782B2 - Internal combustion engine intake control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake control device that adds part of exhaust gas or the exhaust gas and dilution air to the intake system of an internal combustion engine depending on the operating state.

Generally, an exhaust gas recirculation device for an internal combustion engine is installed to reduce harmful nitrogen oxides (NOx) in the exhaust gas, and it recirculates a portion of the exhaust gas and guides it from the intake system of the internal combustion engine into the cylinder to lower the combustion temperature. This reduces the generation of NOx.

However, when exhaust gas is recirculated, the combustion efficiency within the cylinder is generally poor, and when a large amount of exhaust gas is recirculated, not only does the output and fuel efficiency deteriorate dramatically, but it also impairs drivability and can lead to problems such as engine stalling. . Therefore,
Conventionally, the amount of exhaust gas recirculation has been controlled in a complicated manner in accordance with various operating conditions, taking into consideration the amount of nitrogen gas generated, output, and fuel efficiency.

By the way, in addition to the above-mentioned exhaust gas recirculation method, a lean combustion method is known as a means for reducing the amount of N○× generated in the combustion process. For example, the purpose is to burn a mixture of 16 to 2 iron wall degree satisfactorily in a combustion chamber, and since this lean mixture generally has poor ignitability and poor combustibility, various methods have been adopted as countermeasures.

For example, the climbing room combustion method, stratified combustion method, and direct flow generation method are known, but in these methods, ignition performance is improved by guiding a rich mixture to the vicinity of the spark plug or scavenging the vicinity of the spark plug. At the same time, it improves the mixing of fuel and air by generating strong vortices, etc.
Moreover, it increases the flame propagation speed and improves combustibility.

The above two methods for reducing the amount of N○× generated each have their advantages and disadvantages.The exhaust gas recirculation method has a high reduction rate of N○×, but as mentioned above, it is inferior in terms of output and fuel efficiency, while the lean burn method Although it is difficult to control air and fuel consumption using a carburetor and the reduction rate of N○× is low, L fuel efficiency is improved, and drivability is better than that of the exhaust gas recirculation method. In addition, generally speaking, when the temperature of the intake air taken into the intake passage is low, the density is high, and the air-fuel ratio of the air-fuel mixture generated in the carburetor increases, and the air-fuel mixture tends to be lean. When the temperature rises moderately, some of the fuel is vaporized in the fuel passage of the carburetor, which not only causes problems such as vapor lock, but also causes instability in the air-fuel ratio due to changes in intake air temperature, such as HC, C○, N○× As the emissions of harmful gases such as these increase, problems occur that lead to deterioration in fuel efficiency and drivability.

Therefore, in recent years, particularly in automobile engines, there has been a tendency for intake air temperature control devices to be attached to air cleaners in order to keep the intake air temperature as constant as possible and stabilize the air-fuel ratio.

This intake air temperature control device collects outside air at ambient temperature and air that has become high temperature due to engine heating and guides the warm air into the intake passage. This configuration includes a warm air control valve that controls the ratio. Generally, the intake air temperature in the intake passage is detected by a bimetal, and the deformation of the bimetal is directly applied to the warm air control valve, thereby controlling according to the intake air temperature. ing.

The main object of the present invention is to adopt a negative pressure type warm air suction device having a vacuum motor, and to cause the controller pressure acting on the device to also act on the operator pressure chamber of the exhaust gas recirculation amount control means for controlling the amount of exhaust gas recirculation. An object of the present invention is to provide an intake air control device for an internal combustion engine that can improve drivability and fuel efficiency when the atmospheric temperature is low. Another object of the present invention is to employ a negative pressure type warm air intake device having a vacuum motor, and to operate a negative pressure chamber of an exhaust gas recirculation amount control means provided in the intake system and to dilute the intake air-fuel mixture. To provide an air intake control device for an internal combustion engine that can improve drivability and fuel efficiency when atmospheric temperature is low by operating an air amount control means that controls the amount of air introduced into an intake system. There is a particular thing.

Another object of the present invention is to provide an intake control system for an internal combustion engine that can reduce the amount of N2 generated by adding a portion of exhaust gas and air to the intake system depending on the operating conditions.

Still another object of the present invention is to provide an air intake control device for an internal combustion engine, particularly for an automobile, which maximizes the amount of NOx generated while minimizing a decrease in output, deterioration in fuel consumption, and drivability. There is a particular thing.

Still another object of the present invention is to smoothly switch between the exhaust gas recirculation and the inflow of dilution air without causing an overlap between the two or a time lag such as a period during which the two are stopped, thereby preventing knocking. There is no occurrence, and the drivability during the above switching is good, and the NO 9E
An object of the present invention is to provide an air intake control system, especially for an automobile internal combustion engine, in which the amount of air flow is reduced.

Another object of the present invention is to reduce NOx mainly by recirculating exhaust gas when driving in urban areas where low-speed driving ranges are frequently used, and to reduce NOx emissions by injecting diluting air when driving in suburban areas where high-speed driving ranges are often used. An object of the present invention is to provide an air intake control device for an internal combustion engine, especially for automobiles, which improves fuel efficiency.

Still another object of the present invention is to provide a pneumatic intake control device that is simple in structure, inexpensive, and highly reliable. The above-mentioned objects include an exhaust gas recirculation amount control means which has a negative pressure chamber and controls the amount of recirculation of exhaust gas recirculated from the exhaust passage to the intake passage in accordance with the magnitude of the control negative pressure acting on the negative pressure chamber; A first negative pressure passage that introduces a specific intake negative pressure generated in the intake passage to the upper pressure chamber, an air passage that opens the negative pressure chamber to the atmosphere, and a negative pressure chamber that has a negative pressure chamber. Negative pressure control means that opens and closes the air passage according to the magnitude of the control negative pressure generated, and a vacuum motor that guides outside air at atmospheric temperature activated from outside and warm air that has become high temperature due to engine heating to the intake passage. A warm air control valve that controls the intake ratio, which guides the intake negative pressure to the working chamber of the vacuum motor; A thermo valve that detects the temperature and controls the opening degree of the IJ leaf hole according to the intake air temperature; a fourth negative pressure passage in which a check valve is installed that allows air to flow only in the direction of the vacuum motor; When the intake air temperature is low, the thermovalp closes and a relatively large intake negative pressure is supplied to the working chamber of the vacuum motor via the second negative pressure passage, and the warm air control valve opens to supply warm air. As the intake rate increases, the relatively large intake negative pressure is supplied to the negative pressure chamber of the air pressure control means through the fourth negative pressure passage, and the negative pressure control means opens the air passage to the atmosphere. An intake control device for an internal combustion engine, characterized in that the vacuum valve is configured to be in a closed state;
Or an exhaust gas recirculation amount control means that has a negative pressure chamber and controls the amount of exhaust gas recirculated from the exhaust passage to the intake passage according to the magnitude of the control negative pressure acting on the negative pressure chamber, and dilutes the intake air-fuel mixture. an air amount control means that has a negative pressure chamber and controls the amount of air input from an air passage provided in the intake system in accordance with the magnitude of the controller pressure acting on the negative pressure chamber; A first negative pressure passage that introduces a specific intake negative pressure generated in the intake passage to each of the negative pressure chambers, an air passage that individually opens each of the negative pressure chambers to the atmosphere, and a negative pressure chamber that has the same negative pressure. Negative pressure control means performs slit control such that when one of the air passages is open, the other is opened depending on the magnitude of the control negative pressure generated in the pressure chamber, and the vacuum motor operates from outside to control the outside air at atmospheric temperature. and a warm air control valve that controls the intake rate of warm air that has become high temperature due to engine heating and is guided to the intake passage, a second negative pressure passage that guides intake negative pressure to the working chamber of the vacuum motor, and the vacuum motor. a leaf hole for supplying atmospheric air to the working chamber of the valve, a thermovalp for detecting the temperature of the intake air in the intake passage and controlling the relationship between the leaf holes and the leaf hole according to the temperature of the intake air, and a negative pressure chamber of the negative pressure control means. A third negative pressure passage that introduces a specific intake negative pressure generated in the intake passage, the working chamber of the vacuum motor, and the negative pressure chamber of the negative control means are connected to each other, so that air flows only in the direction of the vacuum motor. A fourth negative pressure passage is provided with a check valve that allows circulation, and when the intake air temperature is low, the thermovalve closes and a relatively large intake air is passed through the second pressure passage. The internal air pressure is supplied to the working chamber of the vacuum motor, the warm air control valve opens and the intake ratio of warm air increases, and the relatively large intake negative pressure is applied to the negative pressure control means through the fourth negative pressure passage. and the negative pressure control means opens an air passage connected to the exhaust gas recirculation amount control means and closes an air passage connected to the air amount control means. This is achieved by an intake control device for an internal combustion engine, which is characterized in that it is configured such that the engine is in a closed state, and further by an embodiment device to be described later.

Next, the present invention will be explained in detail with reference to an embodiment shown in FIG.

In the embodiment of the present invention shown in FIG. 1, a conventional general carburetor 2 is attached to the upper part of an intake manifold 8 which distributes and supplies intake air to each cylinder of an automobile multi-cylinder internal combustion engine (not shown). The air cleaner 3 distributes grains, and the intake air-fuel mixture is generated by the fuel injected from the main nozzle 6 by the venturi 5 of the carburetor 2 or the throttle valve 7 while the air purified by the air cleaner 3 flows downstream through the intake passage 4. The fuel is mixed with fuel injected from a slow-type fuel boat (not shown) drilled into the wall of the nearby intake pipe, and then mixed with exhaust gas supplied from the exhaust gas recirculation passage 8 or with secondary air in the intake manifold. It is formed.

The throttle valve 7 is rotated around the throttle shaft 9 in conjunction with an accelerator pedal (not shown). Three boats 11 are located on the intake passage wall which is located upstream of the upstream free end 10 in the fully closed position, and which becomes downstream of the Okame-yui end turtle 0 when the throttle valve 7 is engaged. , 12 and 13 are drilled.

In addition, each boat 11 to 13 in Fig. 1 is drawn differently from the actual position for convenience of explanation of the negative pressure circuit described in detail below, and the actual shape and shape of each boat in this example are The arrangement is such that a negative pressure having negative pressure characteristics described below is generated.

One end of the exhaust gas recirculation passage 8 is connected to an exhaust passageway, particularly an exhaust boat formed in the engine body (not shown), and the other end is connected to the intake manifold 1 through a customs port. Three exhaust gas recirculation amount control valves 14, 15, and 16 that open and close are interposed, and the control valves 15 and 16 are located upstream with respect to the control valve 14 and are arranged in parallel with each other.

One end of a link 19 is connected to the rear part of the valve body 18 of the control valve 14, which closes when the tip of the control valve 14 closes to the valve seat i7 provided in the exhaust gas recirculation passage 81, and the other end of the link 19 is connected to the throttle shaft. The valve body 18 is connected to the free end of a lever 20 mounted on the valve body 9, and the valve body 18 is provided with a bellows 21 for dust prevention.

The control valve 15 opens and closes the main passage 22 of the exhaust gas recirculation passage 8,
The control valve 16 opens and closes the bypass passage 23 thereof. The valve body 24 of the control valve 15 is a differential pressure responsive device 2 having a diaphragm 25 and a negative pressure chamber 26 formed on the negative side of the diaphragm.
The valve body 24 is fixed to the center of the diaphragm 25 and urged in the closing direction by a spring 28. On the other hand, the valve body 29 of the control valve 16 is operated by a differential pressure response device 32 having a diaphragm 30 and a negative pressure chamber 31 formed on one side of the diaphragm. At the same time, it is urged in the opening direction by a spring 33.

By the way, there is a clean side 34 of the air cleaner 3 on the upstream side due to the interposed position of the control valve 14 in the exhaust gas recirculation passage 8, and further downstream from the position where the control valves 15 and 16 are interposed.
An air passage 35 is opened, and an air valve 36 for opening and closing the air passage 35 is interposed in the middle of the air passage 35.

The valve body 37 of the air valve 36 is opened and closed by a differential pressure response device 38, and the device 38 includes a diaphragm 39 from which the valve body 37 protrudes from the center and a negative pressure chamber 40.
7 is biased by a spring 41 in a direction to close the air passage 35.

A cooling water passage 42 constituting a heat riser is provided in the intake manifold 1, and a thermovalve 43 is attached to the passage 42. The thermovalve 43 has a structure in which a rod 45 is displaced by thermal expansion of a wax element 44 protruding into the cooling water passage 42, and a valve body 46 is opened and closed.When the valve body 46 is opened, a air filter 47 is opened and closed. There are four atmosphere opening passages 49 and 5 in the intervening atmosphere opening hole 48.
0, 51 and 52 are simultaneously opened, and when they are closed, the atmosphere opening holes 48 of the four passages 49, 50, 51, and 52 are opened.
The lotus road to the area was cut off, and traffic between the various passages was also cut off.

Incidentally, a negative pressure control layer 53 (not shown) installed at a suitable location in the engine body or engine room has an on-off valve 5 that selectively opens and closes two air passages 54 and 55.
6, and an atmosphere opening hole 58 having an air filter 57 which is passed through when the on-off valve 56 is connected to the air passage 54 or 55.
, a diaphragm 69 that operates the on-off valve 56, a negative pressure chamber 60 formed on one side of the diaphragm 59, and an atmospheric pressure chamber 6 conveyed to the atmosphere opening hole 58 formed on the other side.
1, a negative pressure passage 62 that guides the negative pressure chamber 601, a spring 63 that biases the diaphragm 62 in the direction in which the on-off valve 56 closes, and a weak spring force that biases the on-off valve 56 in the opening direction. A spring 64 is built in, and the negative pressure passage 6
2, an orifice 65 and a check valve 66 are installed in parallel, the air passage 54 is branched into an air passage 67 and an air passage 681, and a check valve 69 is installed in the passage 68.

In addition, the air cleaner 3 is equipped with an intake air temperature control device 70, and the intake air temperature control device 70 includes a heat coil 72 that collects outside air that has become hot due to heating of an exhaust manifold 71 attached to the engine body (not shown). , a warm air duct 74 that guides the collected warm air to the middle of the nose 73 of the air cleaner 3, a warm air control valve 76 that controls the intake ratio of warm air by operating the vacuum motor 75, and an operating chamber 77 of the vacuum motor 75. Su of intake passage 4. A negative pressure passage 78 that guides the intake manifold negative pressure generated downstream from the throttle valve 7, a leaf hole 79 provided in the middle of the negative pressure passage 78 for sucking the atmosphere, and an intake air inside the clean side 34 of the air cleaner 3. It is equipped with a thermovalve 61 that detects the temperature from the bimetal 801 and controls the opening degree of the overpass leaf hole 79 according to the intake air temperature. The vacuum motor 75 has a configuration in which a diaphragm 83 that connects the warm-up control valve 76 to the center via a rod 82 is pressed downward in FIG. At this time, the diaphragm 83 is positioned in the lower part of FIG. 1 due to the biasing force of the spring 84, the warm air control valve 76 fully closes the warm air duct 74, and fully opens the nose 73, so that negative pressure is introduced into the working chamber 77. Diamond. When the flamm 83 is sucked upward in FIG. 1 against the biasing force of the spring 84, the warm air control valve 76 rotates around a pin 85 attached to the nose 73 to move the warm air duct 74 into the working chamber 77. The lens 73 is opened at a rate corresponding to the magnitude of the negative pressure generated in the area, and the lens 73 is narrowed by that amount.

Orifices 86 and 87 are installed on the upstream and downstream sides of the relief hole 79 of the negative pressure passage 78, respectively. is aimed at stabilizing the operation of the vacuum motor 75.

In this embodiment, when the temperature of the intake air inside the thermovalve 811 and the air cleaner 3 reaches approximately 4000, the small J-hole 79
is fully opened to bring the working chamber 77 of the vacuum motor 75 to approximately atmospheric pressure, and the pressure of the relief hole 79 is set to gradually decrease as the intake air temperature decreases below 4,000 ℃.

The three boats 11, 12 and 1 provided in the carburetor 2
3, the boat 11 is connected to the negative pressure chamber 9 of a conventional negative pressure type ignition advance device 89 through a negative pressure passage 88, and is connected to the negative pressure chamber 9 of a conventional negative pressure type ignition advance device 89 through a negative pressure passage 91 branched from the negative pressure passage 88. It is connected to the atmosphere opening passage 51 which is opened and closed by the thermovalve 43, and is further transported to the negative pressure chamber 31 of the differential pressure response device 32 and the air passage 67 via the negative pressure passage 92. Another negative pressure passage 93 branched from 88
It is connected to the negative pressure chamber 40 and the air passage 55 of the differential pressure response device 38 via.

The boat 12 is connected to the negative pressure chamber 26 of the differential pressure response device 27 via a negative pressure passage 94, and is connected to the atmosphere opening passage 68 via a negative pressure passage 95 branched from the middle of the negative pressure passage 94. Furthermore, the negative pressure passage 94 is connected in the middle to an atmosphere opening passage 49 which is opened and closed by a thermovalve 43 .

Further, the boat 13 is connected to the orifice 65 of the negative pressure control device 53 via a negative pressure passage 96, and is also connected to an atmosphere opening passage 50 that branches from the negative pressure passage 96 and is opened and closed by a thermovalve 43. Further, the atmosphere opening passage 52 which is opened and closed by the thermovalve 43 is a negative pressure passage 78.
It is connected to the check valve 66 of the pressure control device 53 through a negative pressure passage 97 that branches off from the middle of the atmosphere opening passage 52.

Among the above-mentioned passages, the negative pressure passage 91 is provided with an orifice 98, the negative pressure passage 92 is provided with an orifice 99, the negative pressure passage 93 is provided with an orifice 100, and the atmospheric release passage 52 is provided with an orifice 99, An orifice 101 is inserted between the closed position of the negative pressure passage 9 and the negative pressure passage 78.

Furthermore, the port 12 and the boat 13 are also provided with orifices 102 and 103, respectively.

According to the above configuration, the intake manifold negative pressure generated downstream of the throttle valve 7 in the intake passage 4 while the engine is running is diluted by the air taken in from the small J-hole 79 midway through the negative pressure passage 78. It is guided into the working chamber 77 of the vacuum motor 75 in a state where the vacuum motor 75 is closed.

In this case, even if the atmosphere opening passage 52 is open to the atmosphere,
Since the orifice 101 has a large restricting resistance, the negative pressure in the negative pressure passage 78 is reduced to the atmosphere opening passage 52.
It is hardly diluted by air from outside.

Therefore, a negative pressure of a magnitude corresponding to the opening degree of the relief hole 79 acts on the working chamber 77, and when the intake air temperature reaches a high temperature of 40 qo or more, the thermovalve 81 is activated, the relief hole 79 is fully opened, and the working chamber 77 becomes approximately atmospheric pressure, the warm air control valve 76 completely closes the warm air duct 74, and the intake air is only outside air at atmospheric temperature taken in through the opening □ of the nose 73. 81 operates, the relief hole 79 obtains a function according to the intake temperature, and the negative pressure adjusted by the thermovalve 81 acts on the working chamber 77, and the warm air control valve 76 adjusts the function of the warm air duct 74. is controlled according to the intake air temperature, and outside air at atmospheric temperature and air heated by the exhaust manifold 71 are drawn in from the entrance of the nose 73 and are drawn into the nose 73 through the support air duct 74 collected by the heat cowl 72. The intake rate of warm air is controlled to keep the intake air temperature approximately constant.

Negative pressure generated in the boat 11 of the carburetor 2 (hereinafter referred to as disbu-
A negative pressure chamber 9 of a negative pressure type ignition advance device 89 is guided through a negative pressure passage 88 to control the ignition timing of a distributor (not shown), and the negative pressure passage 91
, 92 to the negative pressure chamber 31 of the differential pressure response device 32 to control the opening and closing of the control valve 16, and also to the negative pressure chamber 40 of the rhombic pressure response device 38 via the negative pressure passage 93. This controls the opening and closing of the air valve 36.

In addition, negative pressure (hereinafter referred to as EG) generated at port 12 of carburetor 2
R boost) is led to the negative pressure chamber 26 of the differential pressure response device 27 via the negative pressure passage 94, and controls the opening and closing of the control valve 15.

Furthermore, negative pressure (hereinafter referred to as V) generated in the boat 13 of the carburetor 2
(referred to as CU negative pressure) is supplied to the negative pressure chamber 60 of the negative pressure control device 53 via the negative pressure passage 96, the orifice 65, and the negative pressure passage 62.
is guided to perform opening/closing switching control of the on-off valve 56.

Further, the control valve 14 is linked to the throttle valve 7 by a link 19.
The opening degree is approximately proportional to the opening degree of the throttle valve 7.

The flow rate of exhaust gas recirculated from the exhaust passage through the exhaust gas recirculation passage 8 into the intake manifold is first controlled by the control valves 15 and 16.
After being controlled by the control valve 14, it is further controlled by the control valve 14.

The control valve 16 mainly controls a relatively small amount of exhaust gas recirculation at low loads, and the control valve 15 mainly controls the amount of exhaust gas recirculation in an operating range of medium load or higher.

On the other hand, the flow rate of the air that is guided from the clean side 34 of the air cleaner 34 through the air passage 35 to the exhaust gas recirculation passage 8 and then introduced into the intake manifold 1 is first controlled by the air valve 36, and then the exhaust gas recirculation is carried out. Similar to control valve 1
It is also controlled by 4.

Next, an example of the operation of the control valves 15, 16 and the air valve 36 will be explained with reference to the output diagram shown in FIG.

In Fig. 2, the solid line A is the full-open output line when the throttle valve 7 is fully open, the solid line B is the output line at an idle function (for example, when the throttle valve 7 is opened 3 degrees), and the two-dot chain line F is the steady running curve. , point C indicates a vehicle speed of 40 motors/day, point D indicates a vehicle speed of 60 motors/day, and point E indicates a vehicle speed of 80 motors/day.

Control valve 16 and air valve 36 on which the disboost acts
is open in the operating range to the left of the dashed line G; the control valve 15, on which the EGR boost operates, is opened in the operating range to the left of the dashed line; The opening degree corresponds to the size of the EGR boost in the operating range of This prevents vibrations in the engine body due to stability and a decrease in full-throttle output.

In addition, since exhaust gas recirculation is performed by the differential pressure between the exhaust gas pressure and the intake manifold member pressure, if the flow resistance of the exhaust gas recirculation passage 8 is equal, the operating state where the opening degree of the throttle valve 7 is small and the intake manifold negative pressure is high is The amount of exhaust gas recirculation increases, and there is a problem that the amount of exhaust gas recirculation becomes excessive in low load ranges, and too small in medium and high load regions, but this problem is inversely proportional to the engine output of the control valve 14. This is solved by the relational characteristic that reduces the amount of aperture. Similarly, the supply of secondary air via the air passage 35 is controlled by the control valve 14 to obtain suitable supply amount characteristics.

When the engine is cold (for example, when the water temperature in the cooling water passage 42 is 70°C or lower), the valve body 46 of the thermovalp 43 is open, and the atmosphere passes through the air filter 47 through the atmosphere opening hole 48 to the atmosphere opening passages 49, 50. , 51, 52.

Therefore, the atmosphere introduced into the atmosphere opening passage 51 is guided to the negative pressure chamber 31 via the negative pressure passage 92, closes the control valve 16, and enters the negative pressure passage 88 from the passage 91 in which the orifice 98 is inserted. The discharge boost flowing into the negative pressure chamber 9 of the negative pressure type ignition advance device 89 is weakened, and the vacuum advance angle of the distributor is delayed by the weakened amount, resulting in a low advance state. .

Further, the atmosphere introduced into the atmosphere opening passage 50 passes through the negative pressure passage 96, the orifice 65, and the negative pressure passage 62 to the negative pressure chamber 6.
At this time, the VCU negative pressure generated in the boat 13 has almost no effect due to the orifice 103 installed in the boat 13, and the negative pressure chamber 60 becomes atmospheric pressure, and the on-off valve 5
6 closes the air passage 54 and opens the air passage 55 by the biasing force of the spring 63.

Further, the atmosphere introduced into the atmosphere opening passage 49 is guided to the negative pressure chamber 26 via the negative pressure passage 94, and at this time, the influence of the ECR negative pressure is suppressed by the orifice 102 installed in the boat 12. Further, atmospheric pressure acts on the check valve 66 via the atmosphere opening passage 52 and the negative pressure passage 97, and the negative pressure chamber 26 becomes approximately atmospheric pressure, thereby closing the control valve 15.

In addition, since the on-off valve 56 opens the air passage 55, the atmosphere enters the air passage 5 through the air filter 57 and the atmosphere opening hole 58.
5, this atmosphere is introduced into the negative pressure chamber 4 of the differential pressure response device 38.
0, the negative pressure chamber 40 is brought to approximately atmospheric pressure, and the air valve 3
6 is closed. From the above, when the engine is on the side, the vacuum advance of the distributor is retarded and
If the exhaust gas temperature is increased and, for example, a catalytic converter is installed in the exhaust passage as shown in this example, or if an exhaust gas purification device such as a thermal reactor is installed, the temperature of the exhaust gas purification device will increase. Warmth is promoted, and
Since the control valves 15 and 16 and the air valve 36 are closed to stop the exhaust gas recirculation and the injection of air for air mixture dilution, deterioration of the drive performance is prevented. After warming up the engine (cooling water temperature is 70q0 or more), thermo valve 4
The valve body 46 of No. 3 is connected to the atmosphere opening passages 49, 50, 51 and 5.
2 is closed, and in this state and in a low-speed operating state, for example, in the operating region to the left of the solid line J in FIG. 2, the VCU member pressure generated in the boat 13 is
3 negative pressure chamber 601 is conducted, but this VCU negative pressure is 4
- The suspension diaphragm 59 is positioned downward as shown in FIG. 1 by the biasing force of the spring 63, and the on-off valve 56 opens the air passage 55 and closes the air passage 54 as before the engine warm-up.

Therefore, in this state, the ECR member pressure is conducted to the negative pressure chamber 26, the disboost is conducted to the negative pressure chamber 31, and the control valve 1
5 and 16 have a relationship depending on the pressure of each member, and proper exhaust gas recirculation is performed, and the air valve 36 is kept closed as in front of the engine waist, and the exhaust gas recirculation provides a sufficient NOk reduction effect. has been achieved.

On the other hand, in a high-speed operating state after warming up the engine, for example in the operating range to the right of the solid line J in FIG. 1, the on-off valve 56 opens the air passage 54, closes the air passage 55,
Atmospheric air is introduced into the air passage 54 through an atmospheric vent hole 58.

The atmosphere introduced into the air passage 54 passes through the air passage 68 and the negative pressure passages 95 and 94 and is led to the member pressure chamber 26. In this case as well, the influence of the ECR negative pressure is small and the negative pressure chamber 26 is at approximately atmospheric pressure. Therefore, the control valve 15 is closed. Further, the atmosphere introduced into the air passage 54 is guided to the negative pressure chamber 31 via the air passage 67 and the negative pressure passage 92, and the negative pressure chamber 31 becomes approximately atmospheric pressure, and the control valve 1
6 closes. In this case, the interposition of the orifice 99 does not particularly affect the disboost.

By the way, since the air passage 55 is closed by the on-off valve 56, the negative pressure chamber 40' of the differential pressure response device 38 is connected to the discharge boost, and the air valve 36 adjusts the function depending on the magnitude of the displacement. get. As described above, in the high-speed operation state after the pig machine, the control valves 15 and 16 are closed to stop the exhaust gas recirculation as in the case of the waist machine, while the air valves 36 to 36 are opened at the opening degree according to the operating state. air passage 35
Since more air is injected into the intake passage 4, it is possible to prevent a decrease in output due to exhaust gas recirculation, a decrease in exhaust gas performance, and an excessive rise in temperature in the exhaust system.
The amount of x generated is reduced, fuel efficiency is improved, and the occurrence of knocking due to excessive ignition is suppressed.

In addition, an orifice 6 is provided in the negative pressure passage 62 of the negative pressure control device 53.
5, there is a delay in transmitting the VCU negative pressure generated in the boat 13 to the negative pressure chamber 60 during the transition period from low speed to high speed, and even if the operating state is shifted to high speed, for the time being When the on-off valve 56 does not switch, a sudden change in the air-fuel ratio is avoided for a while during speed increase, preventing deterioration of drivability, and the stoppage of exhaust gas recirculation is delayed, resulting in an increase in speed. In addition, according to the above embodiment, when speeding up or decelerating, there is a seamless and smooth transition from exhaust gas recirculation to atmospheric input, or from atmospheric input to exhaust gas recirculation. ``Drivability is good, with no large temporary fluctuations in output during the above-mentioned gear shift.

By the way, even after the engine has been warmed up, if the outside temperature is, for example, 0.
℃ or lower, the thermovalve 81 fully closes or substantially fully opens the relief hole 79 and guides high negative pressure to the working chamber 77 of the vacuum motor 75 to open the warm air control valve 76.
is fully opened, and this high negative pressure is led to the negative pressure passage 97 via the orifice 101, and further to the negative pressure chamber 601 via the check valve 66 and the negative pressure passage 62,
The VCU pressure generated in the boat 13 has little influence due to the interposition of the orifice 65, and the negative pressure chamber 60 has a high negative pressure regardless of the VCU pressure, except in high-speed operating conditions, which will be described later. As in the operating state, the on-off valve 56 opens the air passage 54 and closes the air passage 55.

Therefore, the outside air temperature is extremely low and the combustion performance of the engine is poor.
Under operating conditions in which the amount of N○× discharged is small and drivability is problematic, the exhaust gas recirculation is suppressed and the deterioration and increase in drivability is prevented.

In high-speed operating conditions, the throttle valve 7 has a large influence;
The intake manifold pressure decreases, and even though the thermovalve 81 closes the relief hole 79, the negative pressure acting on the check valve 66 through the negative pressure passage 97 is conducted to the negative pressure chamber 60 by the check valve 66. First, the negative pressure control device 53 is controlled by the VCU negative pressure. In this embodiment, if a negative pressure of approximately 200 Yanagi Hg or more does not act on the negative pressure passage 97, the check valve 6 is operated by the biasing force of the spring.
6 is set not to open.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is an engine output diagram for explaining the operation of the above embodiment. 1: Intake manifold, 2: Carburetor, 3: Air cleaner,
4: Intake passage, 7 Misthrottle valve, 8: Exhaust gas recirculation passage, 11, 12, 13: Boat, 14715, 16: Exhaust gas recirculation amount control valve, 27, 32, 38: Differential pressure response device, 2
6, 29, 40, 60, 90: Negative pressure chamber, 35: Air passage, 36: Air valve 43: Thermo valve, 49, 50,
51, 52: Atmospheric opening passage, 53: Negative pressure control device, 54
, 55, 67, 68: Air passage, 56: Open/close valve, 62,
78, 88, 91, 92, 93, 94, 95, 96, 9
7: Negative pressure passage, 65, 86, 87, 98, 99, 100
, 101, 102, 103: Orifice, 66, 69:
Check valve, 70: Intake air temperature control device, 72: Heat cowl, 73: Nose, 74: Warm air duct, 75: Vacuum motor, 76: Warm air control valve, 77: Working chamber, 7
9: Relief hole, 81: Thermo valve, 89: Ignition advance device. Little brother 2 diagram Purple J diagram

Claims (1)

[Claims] 1. Exhaust gas recirculation amount control that has a negative pressure chamber and controls the amount of recirculation of exhaust gas that is recirculated from the intake passage to the intake passage in accordance with the magnitude of the control negative pressure acting on the negative pressure chamber. means, a first negative pressure passage that conducts a specific intake negative pressure generated in the intake passage to the negative pressure chamber, an air passage that opens the negative pressure chamber to the atmosphere, and a negative pressure chamber that includes a negative pressure chamber; Negative pressure control means opens and closes the air passage according to the magnitude of the control negative pressure generated in a second negative pressure passage that guides intake negative pressure to the working chamber of the vacuum motor; a relief hole that supplies atmospheric air to the working chamber of the vacuum motor; a thermovalve that controls the opening degree of the relief hole according to the intake air temperature; and a third valve that conducts a specific intake negative pressure generated in the intake passage to the negative pressure chamber of the negative pressure control means.
A fourth negative pressure passage is provided with a check valve that communicates the negative pressure passage of the vacuum motor with the working chamber of the vacuum motor and the negative pressure chamber of the negative pressure control means and allows air to flow only in the direction of the vacuum motor. However, when the intake air temperature is low, the thermovalve closes and relatively large intake negative pressure is supplied to the working chamber of the vacuum motor via the second negative pressure passage, and the warm air control valve opens to adjust the intake ratio of warm air. increases, the relatively large intake negative pressure is supplied to the negative pressure chamber of the negative pressure control means through the fourth negative pressure passage, and the negative pressure control means opens the air passage to the atmosphere to reduce the exhaust gas. An intake control device for an internal combustion engine, characterized in that the recirculation amount control means is configured to be in a closed state. 2 Exhaust gas recirculation amount control means having a negative pressure chamber and controlling the amount of recirculation of exhaust gas recirculated from the exhaust passage to the intake passage according to the magnitude of the control negative pressure acting on the negative pressure chamber, which dilutes the intake air-fuel mixture. an air amount control means having a negative pressure chamber and controlling the amount of air input from an intake passage provided in the intake system in accordance with the magnitude of the control negative pressure acting on the negative pressure chamber; A first negative pressure passage that conducts a specific intake negative pressure generated in the intake passage to each of the negative pressure chambers, an air passage that individually opens each of the negative pressure chambers to the atmosphere, and a negative pressure chamber. Negative pressure control means that performs switching control such that one of the air passages is open and the other closed depending on the magnitude of the controlled negative pressure generated in the negative pressure chamber, and is operated by a vacuum motor to heat the outside air at atmospheric temperature and the engine. a warm air control valve that controls the intake ratio of warm air that has become high in temperature and is guided to the intake passage; a second negative pressure passage that guides the intake negative pressure to the working chamber of the vacuum motor; and a supply of atmospheric air to the working chamber of the vacuum motor. a thermovalve that detects the intake air temperature in the intake passage and controls the opening degree of the relief hole according to the intake air temperature; A third negative pressure passage that conducts intake negative pressure and a check valve that connects the working chamber of the vacuum motor and the negative pressure chamber of the negative pressure control means and allows air to flow only in the direction of the vacuum motor are interposed. A fourth negative pressure passage is provided, and when the intake air temperature is low, the thermovalve is closed and a relatively large intake negative pressure is supplied to the working chamber of the vacuum motor via the second negative pressure passage, thereby controlling warm air. As the valve opens and the intake ratio of warm air increases, the relatively large intake negative pressure is supplied to the negative pressure chamber of the negative pressure control means through the fourth negative pressure passage, and the negative pressure control means The air passage connected to the exhaust gas recirculation amount control means is opened to the atmosphere and the air passage connected to the air amount control means is closed, so that at least the exhaust gas recirculation amount control means is in a closed state. Intake control device for internal combustion engines. 3. The device according to claim 1, for controlling the intake air of an internal combustion engine, in which an orifice is interposed in the negative pressure passage that conducts a specific intake negative pressure generated in the intake passage to the negative pressure chamber of the negative pressure control means. Device. 4. In the device according to claim 1, the specific intake negative pressure generated in the intake passage connected to the negative pressure chamber of the negative pressure control means causes the throttle valve disposed in the intake passage to be fully closed. An internal combustion engine in which negative pressure is generated in a port provided in an intake pipe wall that is located upstream of the upstream free end of the throttle valve and downstream of the free end when the throttle valve is opened. intake control device. 5. In the device set forth in claim 1, an air release passage is connected to the negative pressure chamber of the exhaust gas recirculation amount control means, and a thermovalve is connected to the passage to detect the engine temperature and open only when the engine is cold. Air intake control device for an internal combustion engine. 6. In the device according to claim 2, an atmosphere opening passage is connected to each of the negative pressure chamber of the exhaust gas recirculation amount control means and the negative pressure chamber of the negative pressure control means, and the engine temperature is connected to both the atmosphere opening passages. An intake control device for internal combustion engines equipped with a thermovalve that detects and opens only when the engine is cold. 7. In the device according to claim 2, an air passage for intake mixture dilution is opened in the exhaust gas recirculation passage downstream of the position where the exhaust gas recirculation amount control means is installed, and the air passage is opened downstream of the opening position of the air passage. An intake control device for an internal combustion engine that includes a flow control valve that operates in accordance with the opening degree of the throttle valve of the carburetor in the side exhaust gas recirculation passage. 8. In the device according to claim 2, the intake control of an internal combustion engine includes an orifice interposed in the negative pressure passage that conducts a specific intake negative pressure generated in the intake passage to the negative pressure chamber of the negative pressure control means. Device. 9. In the device according to claim 2, the specific intake negative pressure generated in the intake passage connected to the negative pressure chamber of the negative pressure control means causes the throttle valve disposed in the intake passage to be fully closed. An internal combustion engine in which negative pressure is generated in a port provided in an intake pipe wall that is located upstream of the upstream free end of the throttle valve and downstream of the free end when the throttle valve is opened. intake control device.