JP4254282B2 - Intake device for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for improving an intake device structure of an internal combustion engine.
[0002]
[Prior art]
As an intake device for an internal combustion engine, there is one in which engine output performance is improved by changing the intake system volume (see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-9-137728 [0004]
[Problems to be solved by the invention]
In the intake device described in Patent Document 1, it is necessary to secure a large collector volume in order to increase the fully open output of the engine. However, if the collector volume is increased, the response delay of the intake flow rate increases during transient operation and misfires occur. There is a difficulty in drivability, such as possible occurrence.
[0005]
In addition, since the air cleaner having a considerable capacity is arranged at a location away from the collector, the entire intake system cannot be made compact.
The present invention has been made paying attention to such a conventional problem, and an object thereof is to achieve both compactness and drivability of the intake system.
[0006]
[Means for Solving the Problems]
For this reason, the present invention forms an air cleaner extending in parallel with the cylinder arrangement direction of the engine and a collector extending in parallel with the cylinder arrangement direction of the engine in parallel with each other and is integrally formed by partitioning with one partition wall, In the air cleaner, a filter element is disposed so as to partition the space in the air cleaner into an outside air side space on one end side in the cylinder arrangement direction and a clean side space on the other end side, and the partition wall includes the air cleaner . An on- off valve that opens and closes between the clean side space and the space in the collector adjacent to the clean side space is installed , and the on-off valve opens when the engine output is fully open and closes when the engine is partially loaded. In addition, an intake inlet is provided in the outside air space of the air cleaner, and the clean side space and the collector internal space are connected to each other by external clean side ducts connected to the end portions of the air cleaner and the collector , respectively. It was set as the structure which interposed the chamber.
[0007]
As a result, when the engine output is fully opened, intake air is introduced from the air cleaner to the adjacent collector via the on-off valve only, so that the airflow resistance is small and the air cleaner volume and the collector volume are combined to ensure a large volume chamber. The fully open output can be improved. On the other hand, at the time of partial load, by closing the on-off valve, the volume of the intake system can be reduced to ensure the air flow response and prevent the occurrence of misfire.
[0008]
Further, by integrating the air cleaner and the collector, a volume chamber having a necessary and sufficient size can be secured in one place, and the entire intake system can be made compact.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show an embodiment of an intake device for an internal combustion engine according to the present invention.
[0010]
An intake inlet 21 of the air cleaner 2 is connected to the downstream end of the intake inlet duct 1. The air cleaner 2 and the collector 3 are integrally formed with an outer case, and the inner spaces of the air cleaner 1 and the collector 3 are separated by a single partition 4 and are adjacent to each other.
[0011]
The air cleaner 2 is provided with a filter element 22 for filtering and purifying outside air, and the air cleaner 2 internal space on the downstream side of the filter element 22 forms a clean side space 23. The opening / closing valve 5 that opens and closes the clean side space 23 and the collector internal space 31 is attached to the partition 4 portion on the clean side space 23 side.
[0012]
The on-off valve 5 is a slot-in type as shown in FIG. 5, and a support shaft 52a of a circular valve body 52 is rotatably supported by a circular opening 51a of the valve housing 51. An actuator 53 that opens and closes the on-off valve 5 is connected. As the actuator 53, a negative pressure actuator or a step motor that guides and drives the intake negative pressure accumulated in the accumulator can be used. Then, the peripheral portion of the valve housing 51 is fitted into an opening 41 formed in the partition wall 4 and fastened and fixed. Thus, by making the on-off valve 5 a slot-in type, it is easy to attach and detach, and the inspection can be performed smoothly. In addition, by providing the on-off valve 5 on the clean side, the intake air sucked through the on-off valve 5 when the output is fully opened can be filtered by the filter element 22 to prevent the inhalation of dust, as will be described later.
[0013]
On the other hand, the clean side space 23 and the collector inner space 31 are connected to each other by a clean side duct 6 provided outside the air cleaner 2 and the collector 3. A throttle chamber 61 having a throttle valve 61 a is provided at the downstream end of the clean side duct 6. The throttle valve 61a is interlocked with an accelerator pedal or electronically controlled by an actuator based on an accelerator opening detection value.
[0014]
A throttle sensor 61b for detecting the opening of the throttle valve 61a (throttle opening) is provided, and the throttle opening detected by the throttle sensor 61b is input to the control unit 7 as an engine output signal. In the case of the electronic control type, the accelerator opening detected by the accelerator opening sensor may be input to the control unit 7 as an engine output signal. An air flow meter 8 for detecting the intake air amount is mounted on the upstream side of the clean side duct 6.
[0015]
The control unit 7 drives the actuator 53 of the on-off valve 5 when detecting the engine output fully open state (the throttle opening or the accelerator opening is a predetermined value or more) by the throttle opening (or the accelerator opening). When the on-off valve 5 is fully opened [see FIG. 5D] and a partial load (throttle opening or accelerator opening is less than a predetermined value) state is detected, the on-off valve 5 is fully closed. When the actuator 53 is a negative pressure drive type, the on-off valve 5 is driven by opening a solenoid valve interposed in the negative pressure passage and introducing a negative pressure to the actuator 53. When the actuator 53 is an electromagnetic drive type, The on-off valve 5 is driven by directly driving the actuator by energization.
[0016]
The operation of this configuration will be described.
As described above, when the engine output fully open state is detected by the control unit 7, the on-off valve 5 is opened, so that the intake air introduced from the intake air introduction duct 1 passes through the intake air inlet 21 to the air cleaner 2. Inhaled, filtered through the filter element 22 and guided to the clean side space 23.
[0017]
Then, as indicated by solid line arrows in FIG. 4, the air is sucked from the clean side space 23 through the opened on-off valve 5 into the adjacent collector space 31, and then each intake air of the manifold connected to the collector 31. It is sucked into each cylinder through a port.
[0018]
As described above, when the engine output is fully opened, the air is directly sucked from the clean side space 23 of the air cleaner 2 into the adjacent collector space 31 through only the partition wall 4, so that the passage resistance is small, and the volume of the air cleaner 2 is reduced to the volume of the collector 3. Since a large volume chamber to which is added is obtained, the fully open output can be sufficiently increased.
[0019]
Further, by forming the air cleaner 2 and the collector 3 integrally, a volume chamber having a necessary and sufficient size can be secured in one place, and the entire intake system can be made compact. That is, since this volume chamber has the effect of increasing the fully-open output by providing it directly above the manifold assembly portion, as in the above-mentioned Patent Document 1, when arranging the air cleaner and the collector separately, A large volume chamber is required only by the collector, and the air cleaner also requires a considerable volume, so that the entire intake system is enlarged. As disclosed in Japanese Patent Application Laid-Open No. 2001-241366, there is an air cleaner and a collector formed in one container between banks of a V-type internal combustion engine to achieve compactness. The collector is provided at a position distant from the passage through which the throttle valve is interposed, and since the air cleaner volume does not function as the collector volume, it is difficult to sufficiently increase the fully open output, and there is a limit to downsizing.
[0020]
On the other hand, in the present invention, by making the large volume of the air cleaner 2 function substantially as the collector volume when the output is fully opened, the volume of the entire intake system can be reduced and the size can be made as compact as possible. In particular, as in this embodiment, by providing the air clean 2 and the collector 3 in parallel with the cylinder arrangement direction of the engine, the entire engine can be made compact.
[0021]
On the other hand, at the time of partial load operation of the engine, the on-off valve 5 is closed via the actuator 53 by a signal from the control unit 7. As a result, the intake air introduced from the intake air introduction duct 1 to the clean side space 23 of the air cleaner 2 is drawn into the clean side duct 6 and throttled by the throttle valve 61a, as indicated by the one-dot chain line arrow in FIG. It is sucked into the collector space 31 and sucked into each cylinder through each intake port.
[0022]
In this way, during partial load operation, the volume immediately above the manifold section downstream of the throttle valve 61a can be reduced to only the volume of the collector space 31, so that the intake flow rate control response by operating the throttle valve 61a is good. Can be secured.
[0023]
Here, the total volume of the air cleaner 2 and the collector 3 is increased in order to increase the fully open performance of the engine output, and the volume of the collector 3 is preferably decreased in order to increase the partial load performance. The volume of the air cleaner 2 is preferably larger than the volume of the collector 3, but it is confirmed that the volume of the air cleaner 2 is preferably 6 to 7 times the volume of the collector 3 in order to sufficiently enhance both performances. .
[0024]
FIG. 6 shows the engine performance according to this embodiment. The hatched portions in the figure indicate the engine output and the margin for improving the parameters related to the engine output (engine torque, volumetric efficiency, etc.).
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external appearance of a part of an intake device for an internal combustion engine according to the present invention.
FIG. 2 is a perspective view in a completely assembled state.
3 is an enlarged cross-sectional view of a cross section A of FIG.
FIG. 4 is a system diagram crossing the main part including the control system.
FIG. 5 is a view similarly showing a configuration of a slot-in type on-off valve.
FIG. 6 is a diagram showing engine performance according to the present embodiment.
[Explanation of symbols]
2 Air cleaner 3 Collector 4 Bulkhead 5 Open / close valve 6 Clean side duct 7 Control unit 22 Filter element 23 Clean side space 31 Collector internal space 61 Throttle chamber 61a Throttle valve 61b Throttle sensor

Claims (3)

An air cleaner extending in parallel with the cylinder arrangement direction of the engine and a collector extending in parallel with the cylinder arrangement direction of the engine are arranged in parallel to each other , and are integrally formed by partitioning with one partition wall,
A filter element is disposed in the air cleaner so as to partition the space in the air cleaner into an outside air space on one end side in the cylinder arrangement direction and a clean side space on the other end side,
The partition wall is equipped with an on- off valve that opens and closes between the clean side space of the air cleaner and the space in the collector adjacent to the air cleaner , and the on-off valve opens when the engine output is fully opened, and closes when the engine is partially loaded.
An intake inlet is provided in the outside air space of the air cleaner,
An intake air of an internal combustion engine, wherein the clean side space and the internal space of the collector are connected to each other by external clean side ducts respectively connected to ends of an air cleaner and a collector, and a throttle chamber is interposed in the clean side duct. apparatus. The intake device for an internal combustion engine according to claim 1 , wherein the air cleaner volume is larger than the collector volume. 3. The intake device for an internal combustion engine according to claim 1, wherein the output fully open time is a fully open throttle opening or a fully open accelerator opening. 4.

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