JP2002357161A - Method/device for increasing intake air temperature of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impede generation of white smoke of exhaust gas at cold time. SOLUTION: Cooling water 12 increased in temperature via an engine main unit is allowed to flow along part of an intake passage 9, a temperature of intake air 4 flowing in this intake passage 9 is increased by a heat exchange with the cooling water 12. That is, at cold time of low temperature of the outside air, in the case of holding an idling condition (similar to even in the case of low speed operating condition) for over a long time by stopping a ship on the sea, a supercharge pressure by a turbocharger is no so increased high, and the intake air 4 at a temperature left as not so increased high is introduced to an intake air introducing port 13 of an intake pipe 5, but the cooling water 12 increased in the temperature via the engine main unit is introduced to a cooling water passage 11 from a cooling water introducing port 15, when the cooling water is heat exchanged with the intake air 4 flowing in the intake passage 9, this intake air 4 is made warm air of relatively high temperature, to be guided to the engine main unit, generation of white smoke of exhaust gas is impeded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for increasing the temperature of intake air of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, in a small boat engine used for a fishing boat or a fishing boat, there is a case where the engine is stopped at sea and the fishing boat is kept idling for a long time when enjoying fishing or fishing. is there.

In such a case, the temperature of the cooling water or the like passing through the engine rises and rises, but the temperature of the intake air to the engine is not much different from the outside air temperature. For example, an engine equipped with a turbocharger However, since the supercharging pressure in the idling state does not increase so much, the intake air temperature is guided to the engine without increasing so much.

[0004]

However, when idling is performed for a long time in cold weather, white smoke is likely to be generated in the exhaust gas due to the low intake air temperature, as described above. There was a problem.

The present invention has been made in view of the above circumstances, and has as its object to prevent white smoke from being generated in exhaust gas during cold weather.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for raising the temperature of intake air of an internal combustion engine, which is capable of preventing the emission of white smoke from exhaust gas by increasing the temperature of the intake air in cold weather. The cooling water whose temperature has risen is caused to flow along a part of the intake passage, and the temperature of the intake air flowing through the intake passage is increased by heat exchange with the cooling water.

[0007] With this configuration, the intake air flowing through the intake passage is heated in the middle by heat exchange with the cooling water heated through the engine body, and is guided to the engine body. Therefore, white smoke is not generated in the exhaust gas even if idling is performed for a long time (same as in the case of low-speed operation) in cold conditions where the outside air temperature is low.

Further, when the method of the present invention is specifically carried out, for example, a cooling water passage adjacent to a part of an intake passage for guiding intake air to an engine body along a longitudinal direction of the intake passage with a partition wall interposed therebetween. May be integrally formed, and the cooling water whose temperature has been raised may be introduced into the cooling water passage via the engine main body to exchange heat with the intake air flowing in the intake passage through the partition wall.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 shows a case where the present invention is applied to a small boat engine used for a fishing boat or a fishing boat. 2 is an enlarged view showing the details of the intake pipe of FIG. 1, and FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2, respectively.

The engine body 1 shown in FIG. 1 is equipped with a twin turbo 2. An intake air 4 taken from each air cleaner 3 provided at both ends of the twin turbo 2 is supplied to a compressor 2a. The intake air 4 pressurized by each of the compressors 2a is sent through an intake pipe 5 to an intercooler 6 for cooling, and the intake air 4 is guided from the intercooler 6 to an intake manifold (not shown) to supply the intake air 4 to each of the engine main bodies 1. It is distributed to cylinders.

Further, the exhaust gas 7 discharged from each cylinder of the engine body 1 is sent to each turbine 2b of the twin turbo 2 via an exhaust manifold (not shown), and the exhaust gas 7 that drives each turbine 2b is sent. The air is exhausted from the exhaust port 8 to an exhaust pipe (not shown).

In this embodiment, an intake pipe 5 for guiding the intake air 4 guided from each compressor 2 a of the twin turbo 2 to the engine main body 1 is provided in an intake passage 9 in the intake pipe 5.
A cooling water passage 11 adjacent to the cooling water passage 11 is formed integrally with the cooling water passage 11 along the longitudinal direction of the cooling water passage 11. It is configured so that heat can be exchanged with the intake air 4 flowing in the intake passage 9.

That is, the intake pipe 5 shown here has an intake passage 9 and a cooling water passage 11 which run parallel to each other with a partition wall 10 interposed therebetween, as is particularly apparent from FIG. It has a square pipe shape, and is provided with two intake ports 13 for receiving pressurized intake air 4 from each compressor 2a of the twin turbo 2 on the lower surface on the intake passage 9 side. At one longitudinal end of the passage 9, an intake outlet 14 for sending the intake air 4 to the intercooler 6 is provided.
A cooling water inlet 15 for receiving cooling water 12 from the engine body 1 is provided at one longitudinal end of one side, and the cooling water 12 is supplied to a radiator (not shown) at the other longitudinal end. A cooling water discharge port 16 for sending out is provided.

When the ship is stopped on the sea in cold weather with low outside air temperature and held in an idling state for a long time (the same applies to a low-speed operation state), the supercharging pressure in the twin turbo 2 is too small. Since the temperature does not increase, the intake air temperature is introduced into the two intake ports 13 of the intake pipe 5 without increasing so much. However, the cooling water 12 heated through the engine body 1 cools the intake pipe 5. Since the air is introduced into the cooling water passage 11 from the water inlet 15 and flows in a counterflow along the intake passage 9, the temperature of the intake air 4 flowing through the intake passage 9 is increased by heat exchange with the cooling water 12. The warm air having a relatively high temperature is led to the engine body 1.

Therefore, according to the above embodiment, the temperature of the intake air 4 flowing through the intake passage 9 is increased in the middle by heat exchange with the cooling water 12 heated through the engine main body 1 and guided to the engine main body 1. Therefore, white smoke of the exhaust gas 7 can be reliably prevented even if idling is performed for a long time (the same applies to the case of low-speed operation) in cold conditions where the outside air temperature is low.

Further, as shown in this embodiment, the exhaust gas 7
In order to reliably prevent the formation of white smoke, the intake passage 9 and the cooling water passage 11 are constituted by the integrally formed one-piece intake pipe 5, so that the intake passage 9 and the cooling water passage 11 Compared with the case where each is configured by a separate system, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced. As a result, the cost can be significantly reduced.

The method and apparatus for increasing the temperature of intake air of an internal combustion engine according to the present invention are not limited to the above-described embodiment.
The present invention can be similarly applied to engines other than small boat engines and engines not equipped with a turbocharger such as a twin turbo. Also, the flow directions of the intake air and the cooling water need not necessarily be counter-flow types, and may be parallel flow types. May be adopted, furthermore, fins and the like for increasing the heat exchange efficiency may be appropriately provided on the partition walls, and of course, various changes may be made without departing from the gist of the present invention. It is.

[0019]

According to the above-described method and apparatus for increasing the temperature of intake air for an internal combustion engine according to the present invention, the following various excellent effects can be obtained.

(I) According to the method for raising the intake air temperature of an internal combustion engine according to the first aspect of the present invention, the intake air flowing through the intake passage is exchanged with the cooling water heated via the engine body. So that it can be led to the engine body,
Even if idling is performed for a long time (same as in the case of low-speed operation) in cold conditions where the outside air temperature is low, white smoke of exhaust gas can be reliably prevented.

(II) In the intake air temperature raising apparatus for an internal combustion engine according to the second aspect of the present invention, a cooling water passage is integrated with a part of the intake passage when reliably preventing the exhaust gas from becoming white smoke. Since the intake passage and the cooling water passage are formed as a single component, the number of parts and the number of assembling steps can be reduced as compared with the case where each of the intake passage and the cooling water passage is configured by a separate system. The cost can be reduced, and the cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an example of an embodiment of the present invention.

FIG. 2 is an enlarged view showing details of an intake pipe of FIG. 1;

3 is a view in the direction of arrows III-III in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine main body 4 Intake 5 Intake pipe 9 Intake passage 10 Partition wall 11 Cooling water passage 12 Cooling water

Claims (2)

[Claims] 1. A method of raising the temperature of intake air in an internal combustion engine, wherein the temperature of intake air is raised in cold weather to prevent the emission of white smoke from exhaust gas. A method for raising the temperature of intake air of an internal combustion engine, wherein the temperature of intake air flowing along a part of the passage and flowing through the intake passage is increased by heat exchange with the cooling water. 2. An intake air temperature raising device for an internal combustion engine, wherein the temperature of the intake air is raised in cold weather to prevent the emission of white smoke from the exhaust gas. An adjacent cooling water passage is formed integrally along the longitudinal direction of the intake passage with a partition wall interposed therebetween, and the cooling water whose temperature has been raised through the engine body is introduced into the cooling water passage and the cooling water passage is introduced through the partition wall into the intake passage. An intake air temperature raising device for an internal combustion engine, which is configured to be capable of exchanging heat with intake air flowing through the intake air.