JPS5943488Y2 - Intake system for internal combustion engines for vehicles - Google Patents

Description

[Detailed description of the invention] This invention relates to an intake system for a vehicle internal combustion engine that can prevent foreign matter such as snow, water, mud, etc. from entering the air cleaner in snowy and rainy weather, when driving on puddles or on snow-melting roads. It is something.

In order to improve the operating efficiency (cycle efficiency) of the engine, it is desirable to introduce relatively low-temperature air from outside the vehicle body, and a cold air intake system is known as one means for this purpose.

The cold air intake method introduces cold air from outside the vehicle body into the air cleaner by providing the opening of the air intake passage for introducing the air into the air cleaner in a position where air from outside the vehicle body can be directly sucked. Vehicles that use this cold air intake system have the advantage of increasing engine operating efficiency in good weather, but they also have the advantage of increasing engine operating efficiency in good weather.
When driving on roads with puddles and melting snow, the opening of the cold air intake passage directly sucks in air from outside the vehicle, which naturally causes water and mud scattered by the vehicle traveling in front or the vehicle traveling in the opposite direction. Another disadvantage is that foreign substances such as rain and snow are easily absorbed.

These inhaled foreign substances can enter the engine and cause engine trouble, or on days when the temperature is low, the inhaled water passes through the air cleaner and adheres to the carburetor valve. and freeze,
This causes various problems such as carburetor icing.

Another air intake method is to introduce two air intakes so that in winter, air can be introduced from an internal air intake passage with an opening in the engine room, and in summer, air can be introduced from a cold air intake passage with the above structure. There are some types that have a passage, but since this type was originally intended to switch between the two intake passages seasonally, the switching mechanism installed in the engine room is manually operated. After switching to the cold air intake passage, the same problem as above occurs because the intake passage is used as is.

Furthermore, Japanese Utility Model Publication No. 45-28161 discloses that the switching mechanism is linked to an operating mechanism for controlling a heating device in the vehicle interior, so that when the vehicle interior is heated, the intake air is inevitably routed through the inside air intake path. In this case, inhalation of too cold air that would cause icing on the air volume is automatically prevented, but
It is not possible to prevent water and mud from entering the engine when driving in the rain.

The present invention was developed against this background, and normally maintains high engine operating efficiency by inhaling cold air from outside the vehicle body, but when driving in the rain, there is a risk of inhaling mud, etc. in the engine compartment. The purpose of this device is to provide an intake system that can prevent engine failure by taking air from a position where there is no air in the vehicle body. an air intake passage comprising a cold air intake passage having an opening in the engine compartment; and an inside air intake passage branching from the cold air intake passage and having an opening in the engine room;
In an intake system for a vehicle internal combustion engine that is connected to an air cleaner, one of the cold air intake passage and the inside air intake passage is selectively connected to the air cleaner at a branching point between the cold air intake passage and the inside air intake passage. A switching valve is provided, and the switching valve is normally maintained in a state where the cold air intake passage and the air cleaner are communicated with each other, and a wiper switch mechanism that controls the windshield wiper of the vehicle is placed in a position to operate the windshield wiper. The present invention is characterized in that an operating mechanism is provided which always switches the switching valve to a state in which the inside air suction passage and the air cleaner are communicated with each other in a certain state.

The present invention will be explained in more detail below based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the intake device according to the present invention. In the figure, 6 is an air cleaner for cleaning intake air, and the air cleaned by the air cleaner is supplied to an air supply path 6a.
It is then supplied to the engine.

A cold air intake passage 1 is connected to the air cleaner 6, and an opening 1a thereof is provided at a front grille T at the front of the vehicle body, where air from outside the vehicle body can be most easily taken in.

Near the connection between the cold air intake passage 1 and the air cleaner 6, there is an internal air intake passage 2 having an opening in the engine room.
is provided by branching downward.

At the branching part of the cold air suction path 1 and the inside air suction path 2, there is a valve portion 3a pivotally mounted on the inner surface of the cold air suction path 1 so as to be rotatable in the vertical direction; A switching valve 3 consisting of an iron core 3b is provided.

The iron core 3b is loosely inserted into a hole formed in the upper wall of the branch part of the cold air intake passage 1, and a solenoid 4 installed with its hollow part aligned with the hole. In order to seal and push the iron core 3b downward, an elastic sealing plate 4a is fixed inside the earthen wall of the branch part of the cold air suction passage 1.

Then, this iron core 3b is moved in the vertical direction by the excitation and demagnetization of the solenoid, and the valve part 3 that is interlocked with this is moved in the vertical direction.
a is activated to switch the air intake path.

Between the solenoid 4 and the power source 90, there is a dedicated valve changeover switch 5a provided on the instrument panel, steering wheel, dashboard, console, etc. so that it can be easily operated from the driver's seat, and a generator for the windshield wiper motor 8. The wiper switch 5b, which also serves as a stop control, is connected in parallel so that excitation and demagnetization of the solenoid 4 can be controlled by any switch.

Note that the diode 10 is for preventing current from being supplied to the window wiper motor 8 when the valve changeover switch 5a is closed, and 5c is a key switch.

In the intake system having such a configuration, a wiper switch 5 is provided to operate the windshield wiper in good weather.
b is in the open state, so by opening the valve changeover switch 5a and disconnecting it from the power supply,
The air introduced into the air cleaner 6 is also supplied to the cold air intake passage 1, thereby increasing the operating efficiency of the engine.

Next, in order to ensure visibility during thunderstorms, the wiper switch 5b for starting and stopping the windshield wiper is closed, but at the same time, the solenoid 4 is connected to the power source and energized, and the switching valve 3 is switched. Therefore, the connection between the cold air intake passage 1 and the air cleaner 6, which are likely to inhale air containing foreign substances such as snow, rain, mud, etc., is automatically cut off, and the air is removed from the inside air intake passage 2, which is not likely to inhale these foreign substances. will be supplied.

Furthermore, even in good weather, when the vehicle is driving through puddles, snow-melting roads, etc., there is a risk that foreign matter will be sucked into the air cleaner if cold air intake path 1 is used. Since the solenoid 4 can be excited by closing the valve changeover switch 5a, the air suction path is switched to the inside air suction path regardless of the operation of the windshield wiper to prevent foreign matter from being sucked into the air cleaner 6. You can also do it.

As described above, the intake system according to the present invention prevents snow, water, etc. from being sucked into the air cleaner, which prevents troubles such as carburetor icing and engine trouble that tend to occur when the outside temperature is low in the conventional cold air intake system. There will be no more rebirth.

In order to shorten the warm-up time when starting the engine, if a warm air intake passage is provided to suck air warmed by the exhaust manifold, this can also be used as an inside air intake passage. be.

Furthermore, the switch mechanism that controls the electric signal sent to the solenoid 4 for operating the switching valve 3 is, of course, not limited to that shown in this embodiment, and a wiper switch can also be used alone. It is sufficient that the switching valve is always switched to a state where the inside air intake passage and the air cleaner are communicated with each other, at least when the wiper switch mechanism is in the position where the windshield wiper is operated.

The operating mechanism for operating the switching valve is composed of a diaphragm with a negative pressure introduction path connected to the intake manifold, and a solenoid valve for negative pressure control provided in the negative pressure introduction path. It is also possible to switch the air intake path to the air cleaner by controlling the electrical signal transmitted to the wiper switch mechanism.

As detailed above, the present invention uses the cold air intake passage in good weather to increase engine operating efficiency, and in thunderstorms, puddles, and when driving on roads with melting snow, switches to the inside air intake passage and uses the air cleaner. This prevents foreign matter from being sucked in to avoid engine trouble, and also prevents carburetor icing, which tends to occur when the outside temperature is low.

In addition, the operating mechanism of the switching valve that switches between the cold air intake path and the inside air intake path is controlled using a wiper switch mechanism, so when the wipers are activated, such as when driving in the rain, the intake air is inevitably This is done from the inside air intake passage, which effectively prevents water and mud from entering the air cleaner and further into the engine.

[Brief explanation of the drawing]

The drawing is an explanatory view showing one embodiment of the intake device according to the present invention. 1: cold air intake passage, 1a: cold air intake passage opening, 2: inside air intake passage, 3: switching valve, 3a: valve portion, 3b = iron core, 4: solenoid, 4a: seal plate, 5a: valve switching switch, 5b: wiper switch, 5C: key switch, 6:
Air cleaner, 6a: air supply path, γ: front grill, 8: window wiper motor, 9: power supply, 10: diode.

Claims (1)

[Scope of utility model registration request] An air intake passage that includes a cold air intake passage that has an opening at a position where air from outside the vehicle body can be directly taken in, and an inside air intake passage that is branched from the cold air intake passage and has an opening in the engine room. In the intake system for a vehicle internal combustion engine, the air cleaner is connected to the cold air intake passage and the inside air intake passage, at a branching point between the cold air intake passage and the inside air intake passage. A switching valve is provided for communication between the cold air intake passage and the air cleaner, and a wiper switch mechanism for controlling a windshield wiper of the vehicle is in a position to operate the windshield wiper. An intake system for an internal combustion engine for a vehicle, characterized in that an actuation mechanism is provided for switching the switching valve to a state in which the internal air intake passage and the air cleaner are communicated without fail.