JP2000154726A - Intake control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress power loss in an internal combustion engine and a load increase in a vehicle power source by generating negative pressure in a negative pressure generator by resonance of a partitioning member due to vibration at the time of operating the internal combustion engine, accumulating negative pressure in a negative pressure accumulating tank and opening, closing and driving an intake control valve by making accumulated negative pressure as a driving source. SOLUTION: When a partitioning plate 32 is resonated by vibration of an internal combustion engine 10 during an operation in a prescribed rotation area of the internal combustion engine 10, volume chambers 33, 34 repeat changes in volume, air within a negative pressure accumulating tank 43 is discharged to the atmosphere via the volume chambers 33, 34 and prescribed negative pressure is accumulated within the negative pressure accumulating tank 43. At the time of an operation in a high speed area of the internal combustion engine 10, a switching valve 24 is opened by a control device 50 by energizing the solenoid coil and negative pressure within the negative pressure accumulating tank 43 is supplied to a negative pressure chamber of a negative pressure actuator 23. As a result, an intake control valve 22 is opened, intake from also a second intake passage is performed in addition to intake from a first intake passage up to the time and an increase in engine output can be contrived.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an intake control system for an internal combustion engine, and more particularly to an intake control system for an internal combustion engine that injects fuel directly into a combustion chamber.

[0002]

2. Description of the Related Art Conventionally, a plurality of intake passages are provided for each cylinder of an internal combustion engine for the purpose of, for example, generating a swirl in a combustion chamber of the internal combustion engine or controlling an intake air amount in accordance with an operation state of the internal combustion engine. In order to open and close corresponding ones of the intake passages at the same time, the intake control valves respectively arranged in the corresponding intake passages are driven to be opened and closed by a negative pressure type actuator operated by a negative pressure generated in the intake passage. The intake control device for an internal combustion engine described above is widely known.

[0003] In recent years, an internal combustion engine (direct injection type internal combustion engine) for directly injecting fuel into a combustion chamber to reduce fuel consumption has become widespread. In this type of internal combustion engine, generally, the throttle valve is almost fully opened except at the time of idling. Therefore, when the above-described intake control device is applied to this type of internal combustion engine, a sufficient negative pressure for operating the negative pressure type actuator is used. There was a problem that can not be obtained.

Therefore, conventionally, a positive pressure accumulator tank for accumulating the positive pressure of the intake air pulsation generated in the intake passage and a negative pressure accumulator tank for accumulating the negative pressure generated in the intake passage are provided, and the intake control valve is positively operated. Japanese Patent Application Laid-Open No. 5-2561 discloses an intake control device which is driven to open and close by an actuator operated by a positive pressure in a pressure accumulation tank and a negative pressure in a negative pressure accumulation tank.
No. 42 has proposed this.

[0005]

However, since the positive pressure of the intake pulsation does not become so large, a sufficient positive pressure for operating the actuator cannot be stored in the positive pressure accumulator tank. There was a problem that the valve could not be opened and closed.

[0006] The above-mentioned problem is caused, for example, by storing a predetermined negative pressure or positive pressure in a negative pressure accumulator tank or a positive pressure accumulator tank using a negative pressure pump or a positive pressure pump driven by an internal combustion engine or a motor. Alternatively, the problem can be solved by operating the actuator by positive pressure or by electrically operating the actuator by a motor, a solenoid, or the like. However, according to these means, the power loss of the internal combustion engine increases and the load on the vehicle power supply increases.

Therefore, an object of the present invention is to provide an intake control device suitable for a direct injection type internal combustion engine, which does not cause a power loss of the internal combustion engine or an increase in the load on a vehicle power supply.

[0008]

Technical measures taken to solve the above-mentioned problems include an intake control valve disposed in an intake passage of an internal combustion engine, a negative pressure actuator for driving the intake control valve to open and close, An intake control device for an internal combustion engine comprising a switching means for selectively communicating the negative pressure type actuator with a negative pressure supply source, wherein the negative pressure supply source is slidably and airtightly slidable into the housing. A partition member provided; two volume chambers partitioned and formed in the housing by the partition member to communicate with the atmosphere and the negative pressure accumulating tank via an atmosphere passage and a negative pressure passage, respectively; A first one-way valve which is mounted and allows only air flow from the negative pressure accumulator tank to the volume chamber, and a second one which is interposed in each of the air passages and allows only air flow from the volume chamber to atmosphere. on the other hand A negative pressure generator configured to generate a negative pressure when the partition member resonates at a frequency in a predetermined rotational speed range of the internal combustion engine; and accumulates a negative pressure generated by the negative pressure generator. And a negative pressure accumulator tank connected to the switching means.

According to this means, the negative pressure is generated by the negative pressure generator and the negative pressure is stored in the negative pressure accumulator tank by the resonance of the partition member at the vibration frequency during the operation of the internal combustion engine in the predetermined rotational speed range. Can be The intake control valve is opened and closed by a negative pressure type actuator that applies a negative pressure in the negative pressure accumulation tank via a switching means.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an intake control device for an internal combustion engine according to the present invention will be described below with reference to the drawings.

1 and 2, a direct injection type internal combustion engine 1
The intake manifold 12, one end of which is connected to the cylinder head 11 and the other end of which is connected to the surge tank 16, is connected to swirl ports 17a, 18a, 19a, 20a formed in the cylinder head 11 for each cylinder. First intake passages 12a, 13a, 14a, and 15a, and straight ports 17b, 18b, 19b, and 2 formed for each cylinder.
0b, the second intake passages 12b, 13b, 14b,
15b are alternately provided on the same axis.

Cylinder head 11 of intake manifold 12
At the side end, the first intake passages 12a, 13a, 14a, 15
a and a support hole is formed through the second intake path 12b, 13b, 14b, 15b in the radial direction, and one valve shaft 21 is rotatably supported in the support hole. At a portion of the valve shaft 21 penetrating through the second intake passages 12b, 13b, 14b, 15b, a disk-shaped intake control for opening and closing the second intake passages 12b, 13b, 14b, 15b according to the rotation of the valve shaft 21. Valves 22 are respectively mounted.

One end of a valve shaft 21 is connected to one end of a rod of a negative pressure type actuator 23 via a link. The negative-pressure actuator 23 has a negative-pressure chamber airtightly defined in a body by a plate with a diaphragm (not shown) connected to the other end of the rod, and a plate and a spring (not shown) provided in the negative-pressure chamber. The rod is constantly urged to the side that closes the intake control valve 22, and the negative pressure applied to the negative pressure chamber causes the plate and rod to be sucked into the negative pressure chamber side against the spring to control the intake. This is a known method for opening the valve 22.

A negative pressure chamber (not shown) of the negative pressure type actuator 23 is communicated with a negative pressure accumulating tank 43 through a pipe 25, and a well-known switching valve 24 is interposed in the pipe 25. . The switching valve 24 is formed of a three-way two-position solenoid valve. When the solenoid coil (not shown) is not energized, the switching valve 24 communicates the negative pressure chamber with the atmosphere and cuts off the communication between the negative pressure storage tank 43 and the negative pressure chamber and the atmosphere. When the power is supplied, the negative pressure chamber and the negative pressure accumulation tank 43 are communicated. The energization of the solenoid coil is controlled by the control device 50 according to the operating state of the internal combustion engine.

The negative pressure storage tank 43 includes a negative pressure generator 30.
Is connected. The negative pressure generator 30 has a housing 31 attached to the internal combustion engine 10.
Inside 1, there is provided a partition plate 32 whose outer periphery is airtightly attached to a housing 31 via a diaphragm 32a and is movable in the axial direction. Housing 31
Inside, two volume chambers 33 and 34 are defined by a partition plate 32 and a diaphragm 32a. Each of the volume chambers 33 and 34 is connected to a negative pressure accumulation tank
The first one-way valves 37 and 38 are provided in each of the negative pressure passages 35 and 36 and allow only air flow from the negative pressure accumulating tank 43 to the volume chambers 33 and 34. I have. Further, each of the volume chambers 33 and 34 is
0, each of which communicates with the atmosphere, and
9 and 40 are provided with second one-way valves 41 and 42 that allow only air flow from the volume chambers 33 and 34 to the atmosphere.

The housing 31 is mounted on the internal combustion engine 10 such that the direction of movement of the partition plate 32 coincides with the highest vibration direction of the internal combustion engine 10. In addition, the mass of the partition plate 32 and the volumes of the volume chambers 33 and 34 (spring constants of the air springs) are determined by the natural frequency of the negative pressure generator 30 determined by these factors. For example, the frequency is set so as to match the frequency of the internal combustion engine 10 at 1000 to 2000 rpm).

In the above configuration, during operation of the internal combustion engine 10 in the above-described predetermined rotation range, the partition plate 32 resonates due to the vibration of the internal combustion engine 10, and the volume chambers 33 and 34 repeatedly change in volume, and the negative pressure accumulation tank The air in 43 is discharged to the atmosphere via the volume chambers 33 and 34. As a result, a predetermined negative pressure is stored in the negative pressure storage tank 43.

In the low and medium speed ranges of the internal combustion engine 10, the switching valve 24
No current is supplied to a solenoid coil (not shown), and the intake control valve 22 is in a closed state. Thereby, the first intake passages 12a, 13a, 14a, 15a are provided in the combustion chamber of the internal combustion engine.
Intake is made via the.

In the high speed range of the internal combustion engine, a current is supplied to a solenoid coil (not shown) of the switching valve 24 by the control device 50, and the negative pressure type actuator 2 is supplied through the switching valve 24.
The negative pressure in the negative pressure accumulation tank 43 is supplied to the negative pressure chamber 3. As a result, the intake control valve 22 is opened, and the first intake passages 12a, 13a, 14a, 1
Air is taken in through the 5a and the second intake passages 12b, 13b, 14b, 15b.

In the above-described embodiment, the negative pressure generated by the negative pressure generator 30 is stored in the negative pressure accumulation tank 43. However, as shown by a broken line in FIG. 43 are connected in a pipe 60 and a one-way valve 61 that allows air to flow only from the negative pressure accumulator tank 43 to the surge tank 16 is interposed in the pipe 60, thereby generating gas in the intake manifold 12. The negative pressure to be generated may also be stored in the negative pressure storage tank 43.

Further, in the above-described embodiment, the partition member of the negative pressure generator 30 is constituted by the partition plate 32 in which the diaphragm 32a is integrated. However, as shown in FIG. It is also possible to configure the partition member with the free piston 70 attached.

[0022]

As described above, according to the present invention, the negative pressure is generated by the negative pressure generator due to the resonance of the partition member at the frequency during the operation of the internal combustion engine in the predetermined rotational speed range. Since a predetermined negative pressure can be stored in the negative pressure storage tank, even in a direct injection internal combustion engine in which a sufficient negative pressure is not generated in the intake passage, power loss of the internal combustion engine and an increase in the load of the vehicle power supply are not caused. The intake control valve can be opened and closed by the negative pressure in the negative pressure storage tank via the negative pressure actuator.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an intake control device for an internal combustion engine according to the present invention.

FIG. 2 is a partial sectional view showing a cylinder head and an intake manifold of the internal combustion engine shown in FIG.

FIG. 3 is a modification of the partition member of the negative pressure generator in the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Internal combustion engine 11 Cylinder head 12 Intake manifold 12a, 13a, 14a, 15a 1st intake path 12b, 13b, 14b, 15b 2nd intake path 22 Intake control valve 23 Negative pressure type actuator 24 Switching valve (switching means) 30 Negative pressure generation Container 31 Housing 32 Partition plate (partition member) 32a Diaphragm (partition member) 33, 34 Volume chamber 35, 36 Negative pressure passage 37, 38 First one-way valve 39, 40 Atmospheric passage 41, 42 Second one-way valve 43 Negative Pressure accumulator tank

Claims (1)

[Claims] An intake control valve disposed in an intake passage of an internal combustion engine, a negative pressure actuator for opening and closing the intake control valve, and switching means for selectively communicating the negative pressure actuator with a negative pressure supply source. An intake control device for an internal combustion engine, comprising: a housing; a partition member provided in the housing so as to be airtightly movable; and a partition member formed in the housing by the partition member to form an atmosphere. And two volume chambers that communicate with the negative pressure storage tank via an atmosphere passage and a negative pressure passage, and are interposed in each of the negative pressure passages and allow only air flow from the negative pressure storage tank to the volume chamber. A first one-way valve and a second one-way valve interposed in each of the air passages and allowing only air flow from the volume chamber to the atmosphere, wherein the partitioning member is provided at a predetermined rotational speed range of the internal combustion engine. A negative pressure generator that generates a negative pressure by resonating at a frequency; and a negative pressure storage tank that stores the negative pressure generated by the negative pressure generator and is communicated with the switching unit. An intake control device for an internal combustion engine, comprising: