JPH11117774A - Suction device for multicylinder internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suction device for a multicylinder internal combustion engine with plural suction passages arranged in parallel to the longitudinal direction of a vehicle, capable of restricting the variation of torque resulting from introducing air different in density into cylinders. SOLUTION: A suction device 20 has an air cleaner 21, a throttle body 22, a surge tank 23 and an intake manifold 24. In the throttle body 22, a first passage 22L and a second passage 22R are formed to be arranged in parallel to the longitudinal direction of a vehicle. In the respective passages 22L, 22R, throttle valves 27L, 27R are provided to control the amount of suction air introduced into cylinders #1-6 for an engine 15. A hot water passage 41 extended to the longitudinal direction of the vehicle is formed in the throttle body 22. Cooling water increased in temperature after passed through a water jacket in the engine 15 is distributed in the hot water passage 41 from the front side to the rear side of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for a multi-cylinder internal combustion engine mounted on a vehicle, and more particularly, to an intake device having a plurality of passages for introducing intake air to a specific cylinder. The present invention relates to an intake device for a multi-cylinder internal combustion engine provided.

[0002]

2. Description of the Related Art Intake air is introduced into each cylinder of an internal combustion engine through an intake passage. The amount of intake air introduced into each cylinder is usually adjusted by a throttle valve provided in the intake passage, but in recent years, more intake air has been increased by utilizing the pressure pulsation of the intake air generated in the intake passage. There is proposed an intake device in which is introduced into a cylinder.

An example of such an intake device is disclosed in
JP-A-1111226 discloses "an intake device for a V-type multi-cylinder engine". As shown in FIG. 11, an intake passage 100 in the intake device includes a plurality of branch intake pipes 111 to 116 connected to the respective cylinders # 1 to # 6, and an engine 1
The left and right banks 150L, 150R are provided independently of each other, and branch intake pipes 111 to 116 are provided in the respective banks 150L, 150R.
A pair of intake pipes 120 connected to each 150R
L, 120R and their respective intake pipes 120L, 120R
Is connected to the common intake pipe 130. Therefore, the intake air that has passed through the air cleaner (not shown) flows from the common intake pipe 130 to the intake pipes 120L, 120R.
And then distributed to the cylinders # 1 to # 6 by branch intake pipes 111 to 116.

[0004] In addition, two communicating parts 160,
161 are provided, and these communication portions 160 and 16 are provided.
Opening of the on-off valves 160a, 161a, 161b provided in 1 connects the insides of the respective intake pipes 120L, 120R. In this intake device, each open / close valve 16
By opening and closing Oa, 161a, and 161b according to the rotation speed of engine 150, resonance supercharging suitable for the rotation speed is performed.

In such an intake device, generally, each intake pipe 1 provided for the left and right banks 150L, 150R.
It is desirable to set the lengths of 20L and 120R as long as possible. This is because by setting the lengths of the intake pipes 120L and 120R to be long, the resonance supercharging effect can be obtained from a lower rotation speed range.

[0006]

However, if the lengths of the intake pipes 120L and 120R are set to be long as described above, when the intake pipes 120L and 120R are arranged in a limited space of the engine room, Each intake pipe 120
L, 120R (or a part thereof) must be arranged in parallel in the front-rear direction of the vehicle, and in this case, the following problems have occurred.

That is, in the engine room, there is a flow of outside air from the front side to the rear side of the vehicle as the vehicle travels. Therefore, for example, assuming that the left side in FIG. 11 is the front side of the vehicle, the intake pipe 120L whose upstream portion is located on the front side of the vehicle is cooled by the contact of the outside air flow, and the intake pipe 120L located on the rear side is cooled. The temperature becomes lower than that of the tube 120R. Therefore, each intake pipe 120
L, 120R, a temperature difference occurs between the intake pipes 120L, 120R.
The density of the intake air flowing through the inside of each of the intake pipes 1R
It differs every 20L and 120R. As a result, the left bank 150 to which the intake air is distributed from the intake pipe 120L.
L, cylinders # 1, # 3, and # 5, and cylinders # 2, # of the right bank 150R to which intake air is distributed from the intake pipe 120R.
There is a problem that the intake air mass becomes different between # 4 and # 6, causing torque fluctuation.

[0008] Such a problem is not limited to the intake device that achieves the above-described resonance supercharging effect, but occurs in an intake device in which a plurality of intake passages are arranged in parallel in the front-rear direction of the vehicle. This is a common problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a suction apparatus for a multi-cylinder internal combustion engine in which a plurality of intake passages are arranged in parallel in the front-rear direction of a vehicle. An object of the present invention is to suppress the occurrence of torque fluctuation caused by the introduction of intake air having different densities.

[0010]

In order to achieve the above object, the invention described in claim 1 is directed to a passage for introducing intake air to a specific cylinder of a multi-cylinder internal combustion engine mounted on a vehicle. In the intake device of a multi-cylinder internal combustion engine provided with a plurality of intake introduction portions having a plurality of intake passages in parallel in the front-rear direction of the vehicle, an intake introduction portion such that a portion located on the front side of the vehicle is heated more than a portion located on the rear side The gist of the present invention is that a heating means for heating is provided.

[0011] According to the above structure, the intake means is heated by the heating means, so that a portion of the intake introduction portion located at the front side of the vehicle has a relatively higher temperature than a portion located at the rear side of the vehicle. I do. Therefore, the temperature difference between the portion located on the front side of the vehicle and the portion located on the rear side of the vehicle in the intake air introduction portion is reduced. As a result, the density difference of the intake air flowing through each passage is reduced.

According to a second aspect of the present invention, in the intake system for a multi-cylinder internal combustion engine according to the first aspect, the intake introduction section includes a throttle valve for adjusting an amount of intake air flowing into a specific cylinder for each passage. Having a throttle body,
The gist of the heating means is that the heating means includes hot water heating means for heating the throttle body by flowing hot water into a hot water passage provided in the throttle body.

According to the above construction, the throttle body is heated by the hot water flowing through the hot water passage in addition to the effect of the first aspect of the present invention. Is done.

According to a third aspect of the present invention, in the intake system for a multi-cylinder internal combustion engine according to the second aspect, the hot water heating means extends from a front side to a rear side of the vehicle in a hot water path extending in a front-rear direction of the vehicle. The main point is to heat the throttle body by circulating hot water.

In the above configuration, when the hot water in the hot water channel flows from the front side to the rear side of the vehicle, the heat is taken by the throttle body and the temperature gradually decreases. As a result, the portion of the throttle body located on the front side of the vehicle is heated by high-temperature hot water, while the portion located on the rear side is heated by low-temperature hot water. Decrease.

According to a fourth aspect of the present invention, in the intake system for a multi-cylinder internal combustion engine according to the second aspect, the length of the hot water passage in the throttle body is set to be longer toward the front of the vehicle. That is the main point.

In the above configuration, the amount of heat transmitted per hour from the hot water in the hot water channel to the portion located on the front side of the vehicle in the throttle body is compared with the amount of heat transmitted to the portion located on the rear side. Because it is relatively large,
The temperature difference between these two parts is reduced.

Therefore, according to the third or fourth aspect of the present invention, in addition to the operation of the second aspect of the present invention, the intake air flowing through each passage only by flowing hot water through the same hot water passage. Therefore, for example, it is not necessary to provide a plurality of hot water channels in the throttle body through which hot water having different temperatures flows.

According to a fifth aspect of the present invention, in the intake device for a multi-cylinder internal combustion engine according to the second to fourth aspects, the hot water passage is opened and closed according to the temperature of the hot water, and the hot water passage is opened when the hot water reaches a predetermined temperature or higher. The gist of the invention is that the closing valve is disposed in the hot water passage close to the throttle valve of the passage located at the foremost side of the vehicle among the passages.

According to the above configuration, when the temperature of the hot water passing near the valve becomes equal to or higher than the predetermined temperature, the hot water channel is closed by the valve and the hot water stops flowing in the hot water channel, so that the throttle body is heated. Stopped. Here, in the above configuration, the valve is disposed close to the throttle valve of the passage located at the foremost side of the vehicle among the passages, that is, the throttle valve in which the frost phenomenon is particularly likely to occur. The correlation between the temperature of the throttle valve in which the icing phenomenon easily occurs and the temperature of the hot water passing near the valve is enhanced. Therefore, by closing the valve when the temperature of the hot water reaches the predetermined temperature, the heating of the throttle body can be reliably stopped when the temperature of the throttle valve rises to a temperature at which the freezing phenomenon does not occur. . Therefore, the occurrence of the freezing phenomenon in the throttle valve is more reliably suppressed, and the excessive rise in the temperature of the throttle body is avoided.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment Hereinafter, a first embodiment in which the present invention is applied to an intake device of a V-type six-cylinder engine will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 1 shows an engine 15 disposed in an engine room 11 of a vehicle 10 and an intake device 20 for introducing intake air to each cylinder of the engine 15, and FIG. 2 shows an intake device. 20 is schematically shown. In FIG. 2, the members constituting the intake device 20 are shown as being arranged on a substantially straight line, but these members are actually arranged in the engine room 11 in the manner shown in FIG. I do. FIG. 3 shows a cross section taken along line 3-3 in FIG.

As shown in FIG. 1, the engine 15 of this embodiment has an engine room in which the axis of a crankshaft (not shown) is substantially perpendicular to the front-rear direction (left-right direction in FIG. 1) of the vehicle 10. The engine 15 is a horizontal engine 15 mounted in the engine 11.

The cylinder block 16 of the engine 15 is assembled with a left cylinder head 17L located on the front side (left side in the figure) of the vehicle 10 and a right cylinder head 17R located on the rear side (right side in the figure). Have been. A left bank 15L is constituted by a portion of the cylinder block 16 located on the front side of the vehicle 10 and the left cylinder head 17L, and a right bank is constituted by a portion of the cylinder block 16 located on the rear side of the vehicle 10 and the right cylinder head 17R. 15R are configured. In addition, as shown in FIG.
Cylinder # 1, third cylinder # 3, and fifth cylinder # 5 are provided, and second cylinder # 2, fourth cylinder # 4, and sixth cylinder # 6 are provided in right bank 15R.

A ventilation grill 18 is provided at the front of the vehicle 10. A radiator 31 is provided in the engine room 11 so as to face the ventilation grill 18, and a cooling fan 3 is provided behind the radiator 31.
2 are provided. The radiator 31 and the cooling fan 32 constitute a cooling device 30 for the engine 15 described later.

As the vehicle 10 travels, the outside air introduced from the ventilation grill 18 into the engine room 11 and the rotation of the cooling fan 32 rotate the ventilation grill 18 from the engine room 1
The outside air sucked into the inside 1 cools the cooling water in the radiator 31 when passing through the radiator 31, flows through the engine room 11 toward the rear side of the vehicle 10, and flows through the intake device 20. It contacts the constituent throttle body 22 and the like.

Next, the intake device 20 according to the present embodiment will be described. As shown in FIG. 2, the intake device 20 includes an air cleaner 21, a throttle body 22, a surge tank 23, an intake manifold 24, and the like.
An intake passage for introducing intake air into the inside 6 is formed.

The air cleaner 21 has an upstream portion connected to the air inlet 25 and a downstream portion connected to the throttle body 22 via a common pipe 26. Outside air (intake air) introduced from the air inlet 25 passes through the air cleaner 21 and then passes through the common pipe 26.
Introduced inside.

The vehicle 10 is located inside the throttle body 22.
A first passage 22L and a second passage 22R are respectively formed in parallel in the front-rear direction. The first passage 22L is arranged on the front side of the vehicle 10 (the lower side in FIG. 2), and the second passage 22R is arranged on the rear side of the vehicle 10 (the upper side in FIG. 2). A common pipe 26 is provided inside each of the passages 22L and 22R.
From the intake air. The throttle body 22 is formed of a metal having a high thermal conductivity, for example, aluminum.

As shown in FIG. 3, each of the passages 22L, 22R
Are provided with a first throttle valve 27L and a second throttle valve 27R that rotate about a common throttle shaft 27a. Each of these throttle valves 27L, 27R is connected to an accelerator pedal 60.
2 (shown in FIG. 2), and adjusts the cross-sectional area of each of the passages 22L and 22R by rotating in conjunction with the depression operation of the pedal 60. On the side wall of the throttle body 22, a throttle sensor 61 for detecting the amount of rotation of the throttle shaft 27a, that is, the opening of the throttle valves 27L and 27R (throttle opening) is provided.

The throttle body 22 has a hot water passage 4
1. A hot water heating device 40 including a hot water control valve 42 and the like is provided. The hot water heating device 40 will be described later.

As shown in FIG. 2, the throttle body 22
Is connected to the surge tank 23 via a separation pipe 28. The inside of the separation pipe 28 is partitioned into a left bank passage 28L and a right bank passage 28R by a partition wall 28a. The left bank passage 28L is connected to the first passage 22L of the throttle body 22, and the right bank passage 28R is connected to the second passage 22R.
Each is connected to the passage 22R. Further, the inside of the surge tank 23 is also partitioned by the partition 23a into the left bank compartment 2.
3L and a right bank compartment 23R, and the left bank compartment 23L is provided with a left bank passage 28L of the separation tube 28.
The right bank compartment 23R is connected to the right bank passage 28R.

The left bank compartment 23L is a surge tank 23
And branch passage 2 provided in intake manifold 24
9L communicates with each cylinder # 1, # 3, # 5 of the left bank 15L. Similarly, the right bank compartment 23R is also connected to the cylinders # 2, # 4, and # 6 of the right bank 15R by branch passages 29R provided in the surge tank 23 and the intake manifold 24.

The intake air introduced into the first passage 22L from the common pipe 26 passes through the left bank passage 28L and the left bank compartment 23L, and then passes through the branch passage 29L to each cylinder # 1, # 3 of the left bank 15L. , # 5. Also,
The intake air introduced into the second passage 22R from the common pipe 26 passes through the right bank passage 28R and the right bank compartment 23R, and then passes through the branch passage 29R to each cylinder # 2, # 4, # 6 of the right bank 15R. Will be introduced.

Inside the surge tank 23, there is provided a first intake control valve 291 which is opened and closed by an actuator (not shown). When the first intake control valve 291 is opened, the insides of the left bank compartment 23L and the right bank compartment 23R are communicated. The second intake control valve 2 is also opened and closed by another actuator (not shown) inside the throttle body 22.
92 are provided. When the second intake control valve 292 is opened, the first passage 22L and the second passage 22R are opened.
Inside is communicated.

An electronic control unit (not shown; hereinafter, referred to as “ECU”) of the engine 15 controls both actuators according to the rotation speed of the engine 15 and the throttle opening detected by the throttle sensor 61. The first intake control valve 291 and the second intake control valve 2
92 are respectively opened and closed. As described above, by opening and closing the intake control valves 291 and 292 in accordance with the rotation speed and the throttle opening, an optimum inertial supercharging effect can be obtained.

Next, the cooling device 30 for the engine 15 will be described. As shown in FIG. 4, the cooling device 30 includes a radiator 31, a cooling fan 32, a water pump 33, a thermostat 34, and the like. The water pump 33 is a cylinder block 1 of each bank 15L, 15R.
The cooling water is discharged to a water jacket (not shown) formed in the inside 6. Cooling water is supplied from the water jacket of the cylinder block 16 to each of the cylinder heads 17L, 17R.
Flows into a water jacket (not shown) formed therein. When passing through each water jacket, the cooling water is supplied to the cylinder block 16 and each cylinder head 17L,
The temperature rises by absorbing the heat of 17R.

A part of the cooling water passing through the water jackets of the cylinder heads 17L and 17R is supplied to the hot water heating device 40 through a water passage (not shown) formed in the intake manifold 24.

The cooling water that has passed through the water jackets of the cylinder heads 17L and 17R is introduced into the radiator 31 via the water outlet 35. The cooling water is cooled when passing through the radiator 31 and then returned to the water pump 33 via the thermostat 34. A part of the cooling water is returned from the water outlet 35 to the water pump 33 via the thermostat 34 without passing through the radiator 31. Thermostat 34
When the temperature of the cooling water is low, the valve closes to shut off the flow of the cooling water from the radiator 31 to the thermostat 34. As a result, the cooling water does not flow from the water outlet 35 to the radiator 31, and the engine 15 is warmed up early.

Next, the hot water heating device 40 provided in the throttle body 22 will be described. As shown in FIG.
Inside the throttle body 22, there is formed a hot water passage 41 located below the throttle valves 27L and 27R and extending in the front-rear direction of the vehicle 10 (the left-right direction in FIG. 3). A hot water control valve 42 is attached to a side wall of the throttle body 22 on the front side of the vehicle 10, and an upstream portion (the right portion in the figure) of the hot water passage 41 is connected to the hot water control valve 42. As shown in FIG. 4, the hot water control valve 42 is connected to the intake manifold 2.
4 is connected to a water channel (not shown). Therefore, when the hot water control valve 42 is opened, cooling water, ie, hot water, whose temperature has increased through the water jacket of the cylinder block 16 and the cylinder heads 17L and 17R is introduced into the hot water passage 41.

A union 43 is attached to the rear side wall of the vehicle 10 in the throttle body 22, and a downstream portion (the left portion in FIG. 3) of the hot water channel 41 is connected to the union 43. As shown in FIG.
The union 43 is connected to the thermostat 34. Therefore, the cooling water introduced into the hot water channel 41 flows through the hot water channel 41 from the front side to the rear side of the vehicle 10 as shown by an arrow in the figure, and then is introduced into the thermostat 34.

The hot water control valve 42 is a temperature-sensitive valve that opens and closes in accordance with the temperature of the hot water flowing into the hot water channel 41. Stop the flow of warm water. The configuration of the hot water control valve 42 will be described below.

As shown in FIG. 5, the hot water control valve 42 includes a housing 420, a valve body 430 provided in the housing 420, and a valve driving unit 440 for reciprocating the valve body 430.

The housing 420 includes an inlet pipe 421 having an inlet port 421a connected to a water channel of the intake manifold 24, and an outlet port 422a communicating with the hot water channel 41.
And an outflow pipe 422 having The hot water control valve 42 is fixed to the throttle body 22 by screwing one end of the outflow pipe 422 to the throttle body 22.

The valve body 430 includes a shaft 431 extending in the longitudinal direction of the housing 420, and a valve portion 432 fixed to one end of the shaft 431. This valve part 43
The inlet port 421a is opened or closed by the seat 2 being separated from and seated on the valve seat 421c formed in the inflow pipe 421. Also, a flange 431 formed on the shaft 431
A spring 450 is disposed between the spring a and the step portion 421d formed in the inflow pipe 421.
The valve body 430 is constantly urged by 50 toward the direction in which the valve portion 432 is separated from the valve seat 421c.

The valve driving part 440 is fixed to a bottomed cylindrical case 441 fixed by a plurality of fixing parts 421 b formed in the inflow pipe 421, and is fixed to the open end of the case 441 so that the shaft 431 can reciprocate. Supporting sleeve 44
2 is provided. The case 441 and the sleeve 44
2 form a compartment 443, and the other end of the shaft 431 is contained in the compartment 443.

Further, an elastically deformable film body 444 whose peripheral portion is sandwiched between the case 441 and the sleeve 442 is provided in the housing chamber 443 so as to include the other end of the shaft 431. Furthermore, this membrane 4
A wax 445 whose volume changes in response to temperature is filled between the case 44 and the case 441.

In the hot water control valve 42, the hot water introduced from the water channel of the intake manifold 24 to the inlet port 421a passes through the inside of the housing 420 and flows into the hot water channel 41 from the outlet port 422a. On this occasion,
The heat of the hot water is transmitted from the case 441 to the wax 445 in the storage chamber 443.

Here, the temperature of the hot water is low,
If the amount of heat transferred to the wax 445 is small,
Is contracted, and the valve body 430 is urged by the urging force of the spring 450 so that the valve portion 432 is
1c. As a result, the entrance port 421a
Is opened and the housing 420 is inserted through the inlet port 421a.
Inflow of warm water into the inside is allowed.

On the other hand, when the temperature of the hot water rises and the amount of heat transmitted to the wax 445 increases, the shaft 43
1 has a film body 444 associated with the thermal expansion of the wax 445.
Is pushed out of the accommodation room 443 by the deformation of As a result, the valve body 430 moves toward the valve seat 421c against the urging force of the spring 450. Then, when the temperature of the hot water further rises and reaches a predetermined valve closing temperature, the valve section 432 opens the valve seat 4.
21c. As a result, the entrance port 4
21a is closed, and the flow of warm water from the inlet port 421a into the housing 420 is stopped.

Incidentally, the closing temperature of the hot water control valve 42 is adjusted by appropriately combining the thermal expansion coefficient of the wax 445 and the elastic coefficient of the spring 450 so that the vicinity of the first throttle valve 27L reaches a temperature at which the freezing phenomenon does not occur. The hot water control valve 42 is set in advance based on an experiment or the like so as to close.

As described above, in the intake device 20 according to the present embodiment, the hot water passage 41 is provided in the throttle body 22, and the warm water whose temperature has risen through each water jacket is circulated in the hot water passage 41. ing. During cold operation of the engine 15, the throttle valve 27
The moisture adhering to the vicinity of the L and 27R may freeze to prevent the smooth rotation of the throttle valves 27L and 27R. However, according to the present embodiment, the heat of the hot water flowing through the hot water passage 41 causes the throttle body 22 to rotate. Is heated, the occurrence of the above-mentioned freezing phenomenon can be suppressed. As a result, each throttle valve 2 in the cold state
7L and 27R can be smoothly opened and closed.

As described above, outside air introduced from the ventilation grill 18 into the engine room 11 flows through the engine room 11 toward the rear side of the vehicle 10 and contacts the throttle body 22. Since the heat of the throttle body 22 is removed by the contact with the outside air, a portion of the throttle body 22 located on the front side of the vehicle 10 (hereinafter, abbreviated as “front side portion”) is located on a rear side (hereinafter, referred to as “front portion”). , Abbreviated as “rearward portion”).

However, in this embodiment, the hot water channel 41
Since the warm water is caused to flow from the front side to the rear side of the vehicle 10, more heat is transmitted from the warm water to the front side portion of the throttle body 22, and the temperature of the portion increases greatly. The hot water is deprived of heat by the throttle body 22 when flowing through the hot water channel 41, and the temperature gradually decreases. Therefore, according to the above configuration, the front portion of the throttle body 22 is heated by the high-temperature hot water while the rear portion is heated. This is because the side portions are heated by low-temperature hot water.

Accordingly, the temperature difference between the front side portion and the rear side portion of the throttle body 22 is reduced, and the first passage 2
The temperature difference between the intake air flowing through the 2L and the second passage 22R also decreases. As a result, the left bank 1 is passed through the first passage 22L.
The respective cylinders # 2, # 2 of the right bank 15R through the intake passage introduced into the 5L cylinders # 1, # 3, # 5 and the second passage 22R.
It is possible to suppress the occurrence of torque fluctuation due to the difference in density with the intake air introduced into # 4 and # 6.

For example, unlike the present embodiment, the hot water channel 4
The configuration in which the hot water flows from the rear side of the vehicle 10 to the front side in the vehicle 1 can also suppress the occurrence of the icing phenomenon in the throttle valves 27L and 27R described above.

However, in such a configuration, the temperature difference between the front side portion and the rear side portion of the throttle body 22 is further increased, and the torque fluctuation is increased.

Further, in such a configuration, the second passage 22
The temperature of the intake air flowing through R rises, and the right bank 1
The combustion temperature in each of the 5R cylinders # 2, # 4, and # 6 rises, and knocking frequently occurs in each of the cylinders # 2, # 4, and # 6. Therefore, the right bank 1
5R cylinders # 2, # 4, # 6 as well as left bank 1
Regarding each of the 5L cylinders # 1, # 3, and # 5, the ignition timing is retarded. Generally, when knocking occurs in a specific cylinder, ignition timing retard control is performed for all cylinders. Therefore, in the above configuration, the ignition timing is frequently retarded, resulting in a decrease in the output of the engine 15.

In this regard, the configuration according to the present embodiment suppresses the occurrence of the above-described knocking in addition to the suppression of the icing phenomenon and the torque fluctuation of the throttle valves 27L and 27R, thereby avoiding a decrease in the output of the engine 15. The above is also effective.

Further, according to the configuration of the present embodiment, for example, a hot water channel for heating the front side portion and the rear side portion of the throttle body 22 is separately provided inside the throttle body 22, and the front side portion is provided. This is different from the configuration in which high-temperature hot water flows through the hot water channel that heats the hot water channel and low-temperature hot water flows through the hot water channel that heats the rear portion, respectively.
The temperature difference between the front side portion and the rear side portion of the throttle body 22 is reduced by simply flowing hot water through
The difference in the density of the intake air flowing through L and 22R can be reduced. As a result, the structure of the hot water heating device 40 can be simplified.

Further, in the configuration according to the present embodiment, the hot water control valve 42 is
The hot water control valve 42 is attached to the front side wall of the throttle valve 27L, 27R.
Of these, it is arranged closest to the first throttle valve 27L where the icing phenomenon is most likely to occur. Therefore,
Correlation between the temperature of the hot water passing through the hot water control valve 42 and the temperature near the first throttle valve 27L is improved.

For example, unlike the present embodiment, the position of the hot water control valve 42 and the union 43 is reversed so that the hot water control valve 42 is
In the configuration that is attached to the side wall on the rear side of No. 0, the correlation between the temperature of the hot water passing through the hot water control valve 42 and the temperature near the first throttle valve 27L decreases. In such a configuration, the throttle body 22 between the first throttle valve 27L and the hot water control valve 42
This is because the temperature near the first throttle valve 27L when the temperature of the hot water passing through the hot water control valve 42 reaches a predetermined temperature greatly varies.

Accordingly, when the icing phenomenon occurring in the first throttle valve 27L is surely suppressed in this configuration, the hot water control valve 42 is closed in consideration of the temperature variation in the first throttle valve 27L. The temperature of the hot water must be set higher.
As a result, the temperature of the throttle body 22 rises excessively,
The temperature of the intake air flowing through each of the passages 22L and 22R becomes high, causing a decrease in the intake efficiency.

On the other hand, according to the configuration of this embodiment, the temperature of the hot water passing through the hot water control
Since the correlation with the temperature near the throttle valve 27L is high, when the temperature of the first throttle valve 27L rises to a temperature at which the freezing phenomenon does not occur, the hot water control valve 42 is closed to reliably heat the throttle body 22. Can be stopped. Therefore, each throttle valve 27L,
The occurrence of the freezing phenomenon at 27R is more reliably suppressed, and the excessive rise in temperature of the throttle body 22 is avoided. As a result, each throttle valve 27L, 27L
The temperature of the intake air flowing through each of the passages 22L and 22R of the throttle body 22 can be maintained at a lower temperature while a smooth opening and closing operation of the R is reliably ensured, thereby suppressing a decrease in the suction efficiency.

Next, another embodiment according to the present invention will be described focusing on differences from the first embodiment.
Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

[Second Embodiment] First, a second embodiment will be described with reference to FIG. As shown in the figure,
The hot water channel 41 in the present embodiment has a substantially L-shape unlike the linear hot water channel 41 in the first embodiment. That is, the upstream portion of the hot water channel 41 is located on the throttle body 22 in the vehicle 1 more than the first throttle valve 27L.
0 and extends upward through a portion located on the front side of the throttle body 22 and opens at an upper portion of the throttle body 22. Therefore, in the hot water channel 41, the flow path length at the front side portion of the throttle body 22 is set longer than the flow path length at the rear side portion.

According to the configuration of this embodiment, the hot water channel 4
The amount of heat transmitted per hour from the warm water in 1 to the front portion of the throttle body 22 is relatively larger than the amount of heat transmitted to the rear portion. Therefore, according to the present embodiment, in addition to the same operational effects as those of the first embodiment, the throttle body 22
The temperature difference between the front side portion and the rear side portion can be more reliably reduced to suppress the occurrence of torque fluctuation.

[Third Embodiment] Next, a third embodiment will be described with reference to FIG. As shown in the figure,
The hot water passage 41 in the present embodiment is formed inside the throttle body 22 such that a portion located below the first passage 22L is closer to the passage 22L.

According to the configuration of the present embodiment, the portion corresponding to the inner peripheral wall of the first passage 22L in the throttle body 22 has a larger amount of hot water in the hot water passage 41 than the portion corresponding to the inner peripheral wall of the second passage 22R. The heat is transmitted and the temperature rises significantly. Therefore, according to the present embodiment, in addition to providing the same operation and effect as the first embodiment, the temperature difference between the intake air flowing in each of the passages 22L and 22R is more reliably reduced, and the torque fluctuation is reduced. Can be suppressed.

[Fourth Embodiment] Next, a fourth embodiment will be described with reference to FIGS. FIG. 9 shows the lower surface of the throttle body 22.

As shown in these figures, a hot water pipe 47 is disposed below the throttle body 22 in this embodiment so as to be in close contact with the lower surface of the throttle body 22.
The hot water pipe 47 is attached to the throttle body 22 by fixing a pair of attachment plates 48 and 49 to a lower portion of the throttle body 22. Both of the mounting plates 48 and 49 have a shape which is in close contact with the hot water pipe 47 and covers a part thereof. The hot water pipe 47 and each of the mounting plates 48 and 49 are both formed of a metal having high thermal conductivity, for example, aluminum.

As shown in FIG. 9, of the mounting plates 48 and 49, the mounting plate (front mounting plate) 49 located on the front side of the vehicle 10 is the mounting plate (rear mounting plate) 4 located on the rear side.
The area of the portion covering the hot water pipe 47 is set to be larger than 8.

A hot water control valve 42 is provided at a front end (left end in FIG. 9) of the vehicle 10 in the hot water pipe 47.
The union 43 is attached to the rear end of the “0” (the right end in FIG. 9). The hot water flowing into the hot water pipe 47 through the hot water control valve 42 flows from the front side to the rear side of the vehicle 10 through the inside thereof, and the union 43
Is returned to the thermostat 34. In the present embodiment, a hot water channel 45 is formed by the internal space of the hot water pipe 47.

In the configuration according to the present embodiment, since the hot water pipe 47 is in close contact with the lower surface of the throttle body 22, the heat of the hot water is transmitted from the pipe wall of the hot water pipe 47 to the lower part of the throttle body 22. Since hot water flows inside the hot water pipe 47 from the front side to the rear side of the vehicle 10, the first
Similarly to the embodiment, the front side portion of the throttle body 22 is heated by hot water having a relatively high temperature as compared with the rear side portion, and the temperature rises greatly.

Further, in the structure according to the present embodiment, the front mounting plate 49 has a larger area for covering the hot water pipe 47 than the rear mounting plate 48, and therefore the hot water pipe 4
7 transfers more heat. Then, the heat transmitted to the front side mounting plate 49 is further transmitted from the plate to the front side portion of the throttle body 22, so that the temperature of the front side portion increases more than that of the rear side portion.

Therefore, according to the present embodiment, the same operation and effect as those of the first embodiment can be obtained. In addition, by appropriately changing the size of each of the mounting plates 48 and 49, the throttle body 22 The amount of heat transferred to the front part and the rear part can be easily adjusted to reduce the temperature difference between the two parts.

Each of the embodiments described above can be implemented by changing the configuration as follows. In the first embodiment, the hot water passage 41 is formed inside the throttle body 22 so as to extend in the front-rear direction of the vehicle 10. On the other hand, as shown in FIG. 10, the throttle body 22 may be formed so as to extend in the vertical direction at the front side portion.

In each of the second and fourth embodiments, the hot water flows in the hot water passage 41 from the front side to the rear side of the vehicle 10, but the flow direction of the hot water is reversed in the vehicle. The warm water may be circulated from the rear side of 10 toward the front side.

In each of the above embodiments, the hot water heating device 40 is provided on the throttle body 22.
The device 40 may be provided in another member constituting the intake system, for example, the separation pipe 28.

In each of the above embodiments, the engine 1
Although the throttle body 22 is heated by the cooling water of No. 5, the throttle body 22 is heated using a heating means such as an electric heater so that the front portion of the throttle body 22 is heated more than the rear portion. You may make it heat.

The hot water channel 41 in the first embodiment
Are uniform in the front-rear direction of the vehicle 10. On the other hand, the flow path diameter of the hot water path 41 located on the front side of the vehicle 10 may be set to be larger than the flow path diameter of the hot water path 41 located on the rear side. With this configuration, the amount of heat transmitted from the hot water in the hot water passage 41 to the front portion of the throttle body 22 can be further increased.

In the above embodiments, each bank 15L, 1
The passages 22L for introducing the intake air into the 5Rs, respectively.
The hot water heating device 40 is provided for the throttle body 22 having the throttle valve 22R and the throttle valves 27L and 27R disposed in the passages 22L and 22R, respectively. On the other hand, the hot water heating device 40 may be provided for a multiple throttle body having the same number of passages as the respective cylinders (for example, four cylinders) and the throttle valves respectively disposed in the passages. Good.

The throttle valves 27L and 27R in each of the above embodiments are mechanically connected to the accelerator pedal 60. For example, an electronically controlled throttle valve whose opening is adjusted by a motor is used. There may be. In such an intake device having an electronically controlled throttle valve, the temperature of the throttle body tends to be high due to the heat of the motor. In the hot water heating device 40 according to each of the above embodiments, the hot water control valve 42 suppresses an excessive rise in the temperature of the throttle body 22, and thus is suitable as a hot water heating device applied to the intake device 20 as described above.

In the above embodiments, the hot water control valve 42
The valve 42 is opened and closed in response to the temperature of the hot water. However, the valve 42 is not limited to such a temperature-sensitive valve, and the throttle valve 27L,
Any valve may be used as long as the valve closes when the temperature rises in the vicinity of 27R.

In each of the above embodiments, the present invention is applied to the intake device 20 of the V-type engine. However, the present invention can be applied to an in-line engine. Further, the present invention is not limited to the horizontal type engine, and can be applied to a vertical type engine. The technical ideas that can be grasped from the above embodiments are described below together with their effects.

The intake device for an internal combustion engine according to claim 3, wherein the hot water passage is formed in the throttle body so as to be closer to each of the passages as it is located on the front side of the vehicle. .

In the above configuration, in the portion corresponding to the inner peripheral wall of each passage in the throttle body, as the passage is located on the front side of the vehicle, more heat is transferred from the hot water in the hot water passage, so that the temperature rises significantly. Therefore, according to the above configuration, in addition to the effect of the invention described in claim 3, it is possible to more reliably reduce the temperature difference between the intake air flowing through each passage and suppress the occurrence of torque fluctuation.

[0088]

According to the first aspect of the present invention, the intake section is heated by the heating means, so that the portion of the intake section located on the front side of the vehicle is relatively positioned relative to the section located on the rear side. To raise the temperature significantly. Therefore, the temperature difference between the portion located on the front side and the portion located on the rear side of the vehicle in the intake introduction portion is reduced, so that the temperature difference of the intake air flowing through each passage of the intake introduction portion is also reduced. As a result, the density difference between the intake air flowing through each passage is reduced, and it is possible to suppress the occurrence of torque fluctuation due to the difference in the density of the intake air for each cylinder.

According to the second aspect of the present invention, the throttle body is heated by circulating hot water in a hot water passage provided in the throttle body as an intake introduction portion. Therefore, the occurrence of the icing phenomenon in the throttle valve of each passage is suppressed. As a result, according to the present invention, in addition to the effect of the first aspect, a smooth opening / closing operation of each throttle valve at the time of cold can be ensured.

According to the third aspect of the present invention, the hot water flows from the front side to the rear side of the vehicle in the hot water channel extending in the front-rear direction of the vehicle. For this reason, the portion of the throttle body located on the front side of the vehicle is heated by high-temperature hot water, while the portion located on the rear side is heated by low-temperature hot water, and the temperature difference between the two portions decreases. I do.

In the invention described in claim 4, the flow path length of the hot water channel in the throttle body is set to be longer toward the front of the vehicle. For this reason, the amount of heat per unit time transmitted from the hot water in the hot water channel to the portion located on the front side of the vehicle in the throttle body is relatively larger than the amount of heat transmitted to the portion located on the rear side. Thus, the temperature difference between the two portions is reduced.

Therefore, according to the third or fourth aspect of the present invention, the portion located on the front side and the portion located on the rear side of the vehicle in the throttle body can be obtained by merely flowing hot water through the same hot water channel. , And the difference in the density of intake air flowing through each passage can be reduced, so that, for example, it is not necessary to provide a plurality of hot water passages through which hot water having different temperatures flows in the throttle body.

As a result, according to the invention described in claim 3 or 4, in addition to the effect of the invention described in claim 2, the structure of the hot water heating means can be simplified. According to the fifth aspect of the present invention, a valve for opening and closing according to the temperature of the hot water and closing the hot water passage when the temperature of the hot water reaches a predetermined temperature or more is a throttle valve of a passage located at the foremost side of the vehicle among the passages. In the hot water channel.

Therefore, when the temperature of the throttle valve, which is most liable to cause the freezing phenomenon, rises to a temperature at which the freezing phenomenon does not occur, the heating of the throttle body can be reliably stopped. The generation is more reliably suppressed, and an excessive rise in the temperature of the throttle body is avoided.

As a result, in addition to the effects of the invention described in claims 2 to 4, the temperature of the intake air flowing through each passage of the throttle body can be further reduced while ensuring smooth opening and closing operation of each throttle valve. By keeping the temperature low, it is possible to suppress a decrease in the suction efficiency.

[Brief description of the drawings]

FIG. 1 is a plan view showing an intake device provided in an engine room of a vehicle.

FIG. 2 is a schematic configuration diagram of an intake device.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a schematic configuration diagram of an engine cooling device.

FIG. 5 is a sectional view of a hot water control valve.

FIG. 6 is a sectional view showing a hot water heating device according to a second embodiment.

FIG. 7 is a sectional view showing a hot water heating device according to a third embodiment.

FIG. 8 is a sectional view showing a hot water heating device according to a fourth embodiment.

FIG. 9 is a bottom view of a throttle body according to a fourth embodiment.

FIG. 10 is a sectional view showing an example of a configuration change of the hot water heating device.

FIG. 11 is a schematic configuration diagram showing a conventional intake device.

[Explanation of symbols]

10 vehicle, 15 engine, 20 intake system, 22
Throttle body, 22L first passage, 22R second passage, 27L first throttle valve, 27R second throttle valve, 41 hot water passage, 42 hot water control valve
43 ... Union, # 1-6 ... Cylinder.

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI F02M 35/10 311 F02M 35/10 301A

Claims (5)

[Claims] 1. A multi-cylinder internal combustion engine having an intake introduction section having a plurality of passages for introducing intake air to a specific cylinder of a multi-cylinder internal combustion engine mounted on a vehicle in parallel in a front-rear direction of the vehicle. The air intake device according to claim 1, further comprising: a heating unit that heats the air intake unit so that a portion of the air intake unit located on the front side of the vehicle is heated more than a portion located on the rear side of the vehicle. For a multi-cylinder internal combustion engine. 2. The intake body is a throttle body having a throttle valve for adjusting an amount of intake air flowing into the specific cylinder for each of the passages, and the heating means is a hot water passage provided in the throttle body. 2. The intake device for a multi-cylinder internal combustion engine according to claim 1, further comprising hot water heating means for heating the throttle body by circulating hot water therein. 3. The throttle body is heated by flowing hot water from the front side to the rear side of the vehicle through the hot water channel extending in the front-rear direction of the vehicle. An intake device for a multi-cylinder internal combustion engine according to claim 2. 4. The intake device for a multi-cylinder internal combustion engine according to claim 2, wherein the flow path length of the hot water passage in the throttle body is set longer toward the front side of the vehicle. 5. A valve for opening and closing in accordance with the temperature of the hot water and closing the hot water passage when the temperature of the hot water becomes a predetermined temperature or more is set to a throttle valve of a passage located at the most forward side of the vehicle among the passages. 5. The intake device for a multi-cylinder internal combustion engine according to claim 2, wherein the intake device is disposed close to the hot water channel.