JPH09136551A - Intake device of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To close a first intake duct and to open a second intake duct that is open at a higher position than the first intake duct so as to surely prevent water from being sucked into an engine if water may be sucked in through the opening of the first intake duct for use under normal conditions. SOLUTION: A first intake duct 14 and a second intake duct 15 having an opening 15a near a bonnet are made to branch from each other, and a switching valve 18 which selectively opens and closes each intake duct 14, 15 is placed at this branching part 16 and is operated by the breaker circuit of a radiator fan motor 10 via an electromagnetic actuator 19 for opening or closing. If the vehicle 1 enters a deep puddle, etc., a radiator fan 9 is dipped in water, the current consumed by the radiator fan motor 10 becomes excessive, the breaker circuit is switched on, and thus the switching valve 18 is switched by the actuator 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first intake duct used for normal traveling and a second intake duct used when traveling in a deep pool of water and having an opening at a position higher than the first intake duct opening. The present invention relates to an intake device for an engine that includes an intake duct and selectively switches between the intake ducts.

[0002]

2. Description of the Related Art When driving a vehicle, it is sometimes necessary to drive over a deep pool of water formed by heavy rain or flood, a road like a river, or an off-road such as a spring or wetland.

However, since the intake duct of a general engine is often opened near the front grill, when the water level rises near the front grill, water or muddy water is sucked from the opening of the intake duct and combustion of the engine is disturbed. Therefore, there is an inconvenience that the engine stalls and the vehicle cannot run.

In order to deal with this, for example, in Japanese Utility Model No. 62-
In Japanese Patent No. 43929, a lid is provided at the inlet opening of the front end of the intake duct, the lid being openable and closable via a hinge, and a float for rotating the lid in the closing direction by buoyancy is attached to the lid. Further, by providing a second intake port, which is a one-way valve that takes in intake air when the inlet opening is closed, at a position higher than the front end inlet opening of the intake duct, the intake duct tip is normally provided. Intake air is taken from the inlet opening of the section, and when the water level rises, the lid is rotated by the buoyant force of the float to close the inlet opening at the tip of the intake duct, and the one-way valve is opened by the negative pressure of the intake to open the second intake port at a high position. There is disclosed a technique for preventing intake of water into the engine when the water level rises by taking in intake air from.

Further, Japanese Utility Model Laid-Open No. 62-56424 discloses a first intake duct that opens in the front grill surface and a second intake duct that opens in the front fender on the side of the vehicle, midway through the intake duct of the engine. A float switch that activates the switch contact when the water level is above a predetermined level is installed in the float chamber that receives the water when the vehicle enters the water pool, and the opening and closing provided for each intake duct by the operation of the float switch. By selectively opening and closing the valve, the first intake duct is normally opened and the second intake duct is closed during normal operation, and low-temperature intake air is taken in from the front grille surface to prevent a decrease in engine charging efficiency and to reduce the water level. At the time of rising, the first intake duct is closed by the operation of the float switch, and the second intake duct is opened, which is higher than that of the first intake duct. Incorporating air through the second air intake duct which opens into location, technique for preventing suction of water into the engine during level rise is disclosed.

[0006]

However, in the first prior art example described above, when the water level rises, the lid is rotated only by the buoyancy of the float to close the inlet opening at the tip of the intake duct that is normally used. Insufficient sealing, and
The lid may rotate due to vibrations when the vehicle is running, unnecessarily closing the intake duct inlet opening, which is unreliable, and the one-way valve that constitutes the second intake opening is opened by the intake negative pressure. Therefore, the intake resistance at this time is large, and the engine output may fluctuate when the second inlet is opened due to the blockage of the intake inlet opening, and the engine output may fluctuate in the opposite case.

Further, in the second prior art example, the control pressure to each actuator is electrically switched to selectively open and close the on-off valve provided in each duct, so that the sealing property of the lid is ensured. In addition, although the increase in intake resistance is prevented, since the float switch detects a rise in the water level, vibration of the vehicle may also activate the float switch to unnecessarily open and close each intake duct. Therefore, switching of the switches is complicated, and water may be sucked into the engine at this time, and similarly, there is an inconvenience of low reliability.

In view of the above circumstances, the present invention surely detects the water when there is a risk of sucking water from the opening of the first intake duct which is normally used, and closes the first intake duct, and It is an object of the present invention to provide a highly reliable engine intake device that opens a second intake duct that is opened at a position higher than the intake duct opening and does not malfunction due to vibration or the like when the vehicle is running.

[0009]

In order to achieve the above object, the invention according to claim 1 is located at a position higher than a first intake duct that normally uses an intake duct of an engine and an opening of the first intake duct. Second with an opening at the water level
In the intake device of the engine equipped with an intake duct switching device that branches to the intake duct of, and selectively opens and closes each intake duct according to the water level with respect to the vehicle, when the current consumption of the radiator fan motor is overcurrent, An intake duct switching control means for operating the intake duct switching device to close the first intake duct and open the second intake duct is provided.

According to a second aspect of the invention, in the first aspect of the invention, the first intake duct opens near the front grill, and the second intake duct extends near the bonnet and opens. The intake duct switching device is arranged at a branch portion between the first intake duct and the second intake duct, and when the first intake duct is closed, the second intake duct switching device is provided.
Of the radiator fan motor, and the intake duct switching control means is constituted by an opening / closing valve that closes the second intake duct when the first intake duct is opened, and an actuator that operates the opening / closing valve. Connected to a power supply line for supplying power to the radiator fan motor when the current consumption of the radiator fan motor is normally OFF and the first intake duct is opened by the actuator, and when the current consumption of the radiator fan motor is overcurrent, the actuator is turned on. And a breaker circuit that opens the second intake duct.

That is, according to the first aspect of the present invention, when the current consumption of the radiator fan motor is normal, the first intake duct is opened and the second intake duct is closed, so that the first intake air used in the normal time is used. When intake air is taken into the engine from the duct and the radiator fan gets submerged in water due to the rise in water level to the vehicle, the current consumption of the radiator fan motor becomes overcurrent, and at this time, the intake duct switching control device operates the intake duct switching device. Then, the opening / closing valve closes the first intake duct and opens the second intake duct, and intake air to the engine is taken in from the second intake duct opening at a position higher than the first intake duct. Water is prevented from being sucked in.

According to the second aspect of the present invention, when the current consumption of the radiator fan motor is normal, the breaker circuit connected to the power supply line of the radiator fan motor is turned off.
The actuator opens the first intake duct whose opening / closing valve opens near the front grill and closes the second intake duct which extends and opens near the bonnet, and opens the first intake duct near the front grill from the engine. Intake of low temperature is taken in. Further, when the radiator fan is submerged in water due to the rise in the water level with respect to the vehicle, the current consumption of the radiator fan motor becomes an overcurrent, the breaker is turned on to operate the actuator, and the actuator switches the open / close valve to open near the front grill. The first intake duct is closed and the second intake duct is opened, and intake air to the engine is taken in from the second intake duct that opens near the hood that is higher than the first intake duct opening. Water is prevented from being sucked into the engine from the intake duct.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention. FIG. 1 is a partially cutaway side view showing an essential portion of a vehicle, and FIG. 2 is a breaker circuit diagram of an engine intake device according to the present invention. .

Reference numeral 1 shown in FIG. 1 denotes a vehicle, 2 denotes an engine room of the vehicle 1, 3 denotes a hood for opening and closing the engine room 2, and 4 denotes an engine.

A radiator 6 for cooling the cooling water heated by heat exchange with the engine 4 is provided on the front grill 5 side of the engine room 2, and a rear surface 7 of the radiator 6 and a front surface of the engine 4 are provided. A radiator fan 9 and a radiator fan motor 10 for driving the radiator fan 9 are provided between the radiator fan 9 and the radiator fan 9.

On the other hand, the engine 4 is attached to a cross member via an engine mounting device (not shown) and is elastically supported by the vehicle body. The engine 4 is mounted on the engine 4 via an intake duct 11, an air cleaner 12 and an intake pipe 13. Intake air into each cylinder (not shown).

The intake duct 11 includes an air cleaner 12
The first intake duct 14 extending toward the front grill 5 side and opening near the front grill 5 above the radiator 6, and the outside air introduction port of the bonnet 3 extending toward the rear side of the bonnet 3 upstream of the bonnet 3. 3a and a second intake duct 15 that has an opening 15a at a position higher than the opening 14a of the first intake duct 14 and is branched into two parts. An intake duct switching device 17 for selectively switching and using the second intake duct 15 is provided.

This intake duct switching device 17 is specifically, the first intake duct 14 and the second intake duct 1 described above.
5 is provided at a branching portion 16 with each of these intake ducts 1
An on-off valve 18 for selectively opening and closing 4, 4 and the on-off valve 1
8 and an electromagnetic actuator 19 for switching. The electromagnetic actuator 19 is switched by a breaker circuit 20 as an example of an intake duct switching control means.

The breaker circuit 20 in the present embodiment is a normally open breaker circuit, and as shown in FIG. 2, a power supply line 21 for supplying power to the radiator fan motor 10.
When the current consumption of the radiator fan motor 10 exceeds the set value, the contact 22 is turned on by the exciting coil 23 provided in the power supply line 21, and the electromagnetic coil 24 of the electromagnetic actuator 19 is connected to the power supply line 21. The electromagnetic actuator 19 is switched to operate by energizing.

That is, in the present embodiment, when the current consumption of the radiator fan motor 10 is less than the set value, the breaker circuit 20 is turned off and the electromagnetic coil 24 of the electromagnetic actuator 19 is de-energized, so that the electromagnetic actuator 19 is operated. The lever 25 of the electromagnetic actuator 19 is brought into a projecting state by the urging force of a spring (not shown) installed inside the opening / closing valve 15 via the link 26.
Is positioned as shown by the broken line in FIG. 1, so that the first intake duct 14 opening near the front grill 5 is opened and the second intake duct 15 is closed. At the time of overcurrent, the breaker circuit 20 is turned on to energize the exciting coil 24 of the electromagnetic actuator 19, and the exciting force thereof causes the lever 25 to retreat against the biasing force of the spring to open / close the valve via the link 26. By rotating 18 in the clockwise direction as shown in FIG. 1 and positioning the opening / closing valve 18 in the state shown by the solid line in the figure, the first intake duct 14 is closed and the opening of the first intake duct 14 is opened. It is configured to open the second intake duct 15 having the opening 15a at a position higher than 14a.

Next, the operation will be described.

During normal operation of the vehicle, the current consumption of the radiator fan motor 10 is less than the set value and the breaker circuit 20
Is turned off, the electromagnetic coil 24 of the electromagnetic actuator 19 is de-energized. Therefore, at this time, the lever 25 of the electromagnetic actuator 19 is brought into a protruding state by the urging force of a spring (not shown) built in the electromagnetic actuator 19, and the opening / closing valve 15 is opened via the link 26.
The first intake duct 14 located near the front grill 5 is opened and the second intake duct 15 is closed. Then, low-temperature air is supplied to the engine 4 from the vicinity of the front grill 5 on the front surface of the vehicle through the first intake duct 14, thereby preventing a decrease in charging efficiency of the engine 4.

On the other hand, the vehicle 1 enters a deep pool of water,
When the water level with respect to the vehicle rises and the radiator fan 9 is submerged in water, the rotation resistance of the radiator fan 9 increases significantly due to the water, and the radiator fan motor 10 that rotates the radiator fan 9 is overloaded and the radiator fan motor 10 is consumed. The current exceeds the set value. Therefore, the breaker circuit 20 is turned on to energize the exciting coil 24 of the electromagnetic actuator 19, and the exciting force thereof causes the lever 25 to retreat against the urging force of the spring, and the on-off valve 18 is opened via the link 26. As shown in FIG. 1, the on-off valve 18 is rotated clockwise as shown by the solid line in FIG. 1, the first intake duct 14 opening near the front grill is closed, and the first intake air is closed. Duct 14
The second intake duct 15 having the opening 15a at a position higher than the opening 14a is opened, and fresh air is supplied to the engine 4 via the second intake duct 15.

Therefore, when the vehicle 1 enters a deep pool of water or the like, the first intake duct 14 opening near the front grill 5 on the front surface of the vehicle, which is normally used, is closed and the water is discharged from the first intake duct 14. Is prevented from being sucked into the engine, and at this time, fresh air is sucked into the engine 4 through the second intake duct 15 that is open at a high position, so that combustion failure and engine stall of the engine 4 are prevented.

Here, the first intake duct 14 which is normally used in response to the rise of the water level with respect to the vehicle and the second intake duct 15 which has the opening 15a at a position higher than the opening 14a of the first intake duct 14 are provided. At the time of switching, since the intake ducts 14 and 15 are switched depending on whether the current is the overcurrent state by using the consumed current of the radiator fan motor 10, the float is used as in the above-described prior example, while the vehicle is running. It is possible to reliably and properly switch the intake ducts 14 and 15 without being affected by vibration and without unnecessarily switching the intake ducts 14 and 15.

The present invention is not limited to this embodiment,
The radiator fan 9 and the radiator fan motor 1 described above.
Reference numeral 0 also includes a condenser fan of an air conditioner condenser and a condenser fan motor that are installed together with the radiator 6.

Further, although the normally open type breaker circuit 20 is used in the present embodiment, a normally closed type breaker circuit may be used. In this case, an operation reverse to that of the present embodiment is performed as an electromagnetic actuator. Use an actuator that does.

Further, in the present embodiment, the breaker circuit is used as the intake duct switching control means, but, for example, an electronic control unit (ECU) for controlling the engine.
May be adopted as the intake duct switching means, the consumption current of the radiator fan motor may be input to the electronic control unit to determine whether it is in an overcurrent state, and the electromagnetic actuator may be operated based on the determination result. .

[0030]

According to the first aspect of the present invention, the water level rise for the vehicle is determined based on the current consumption of the radiator fan motor without directly detecting the water level by the float, and the water level rise for the vehicle causes the radiator fan to rise. When the radiator is soaked in water, the current consumption of the radiator fan motor becomes an overcurrent, and at this time, the intake duct switching control means operates the intake duct switching device to close the first intake duct which is normally used by the opening / closing valve. 1
Since the second intake duct that is opened at a position higher than the opening of the intake duct is opened, if there is a risk that water will be sucked in from the first intake duct opening that is normally used, this will be reliably detected before The first intake duct is closed and the first is
The second intake duct, which is open at a position higher than the intake duct opening, can be opened to reliably prevent water from being sucked into the engine from the first intake duct, thus preventing engine malfunction and engine stall. It can be surely prevented. Also, when switching between the first intake duct that is normally used and the second intake duct that has an opening at a position higher than the opening of the first intake duct in response to the rise in the water level with respect to the vehicle, the current consumption of the radiator fan motor is increased. Based on the above, the water level rise for the vehicle is judged depending on whether it is an overcurrent state or not, and each intake duct is switched, so while the float is used as in the preceding example, it is affected by vibration etc. during vehicle running. As a result, the intake ducts are not unnecessarily switched, the intake ducts can be switched reliably and appropriately, and an intake system for a highly reliable engine can be obtained.

According to the second aspect of the invention, in addition to the above effects, when the current consumption of the radiator fan motor is normal, the breaker circuit connected to the power supply line of the radiator fan motor is turned off, and the on-off valve is opened by the actuator. The first intake duct opening near the grill is opened, the second intake duct extending near the bonnet and opening is closed, and low-temperature intake air is taken into the engine from the first intake duct opening near the front grill, Also, if the radiator fan gets submerged in water due to the rise in water level to the vehicle, the current consumption of the radiator fan motor will become an overcurrent, the breaker circuit will turn ON and the actuator will operate, and the actuator will switch the open / close valve to open near the front grill. The first intake duct is closed and the second intake air is closed. Is opened, and intake air is taken into the engine from the second intake duct that opens near the hood that is higher than the opening of the first intake duct, preventing the intake of water from the first intake duct to the engine. Therefore, the second intake duct, which is opened when there is a risk of sucking water from the first intake duct, can be opened at a relatively high place, and the second intake duct is higher than the conventional intake system for an engine. It is possible to respond even at the water level, and also
Only one on-off valve is needed to selectively open and close each intake duct, and further, a radiator fan is simply used as compared with a conventional engine intake device that selectively switches between the first intake duct and the second intake duct. Since a breaker circuit that turns on and off according to an overcurrent is inserted into the power line of the motor and the actuator for switching the on-off valve is operated by the breaker circuit, the breaker circuit can be easily incorporated into a conventional engine intake device. It can be realized easily with a simple structure.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a main part of a vehicle.

FIG. 2 is a circuit diagram of a breaker of an intake system for an engine according to the present invention.

[Explanation of symbols]

 1 Vehicle 4 Engine 10 Radiator Fan Motor 14 First Intake Duct 14a First Intake Duct Opening 15 Second Intake Duct 15a Second Intake Duct Opening 16 Branch 17 Intake Duct Switching Device 18 Opening / Closing Valve 19 Actuator 20 Breaker circuit (intake duct switching control means) 21 Power line

Claims (2)

[Claims] 1. An engine intake duct is branched into a first intake duct which is normally used and a second intake duct which has an opening at a position higher than the opening of the first intake duct and is used when the water level rises. In an intake system for an engine equipped with an intake duct switching device that selectively opens and closes each intake duct according to the water level with respect to the vehicle, when the current consumption of the radiator fan motor is overcurrent, the duct switching device is activated. An intake system for an engine, comprising: intake duct switching control means for closing the first intake duct and opening the second intake duct. 2. The first intake duct opens near the front grill, the second intake duct extends and opens near the bonnet, and the intake duct switching device includes the first intake duct and the first intake duct. An on-off valve which is disposed at a branch portion of the second intake duct and which opens the second intake duct when the first intake duct is closed and closes the second intake duct when the first intake duct is opened; The intake duct switching control means is connected to a power supply line for supplying power to the radiator fan motor, and the current consumption of the radiator fan motor is normally turned off to allow the actuator to operate. The first intake duct is opened, and when the radiator fan motor current consumption is overcurrent, it is turned on to operate the actuator and An intake device for an engine according to claim 1, characterized in that the consisted breaker circuit to open the air intake duct.