JPH09317480A - Intercooler for turbocharged engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling efficiency of an intercooler by fitting gas injection nozzle members through the inside of the cooling fins of the intercooler to for injecting therefrom cooling gas from a cooling gas accumulator part toward the cooling fins. SOLUTION: When a master switch 28 installed about the driver's seat is turned on, a control unit 25 reads therein the temperature of air flowing in an intercooler unit 14 detected by a temperature sensor 27 and indicates the temperature on a control panel 29. Through the observation of the flow air temperature in the intercooler unit 14, when a turbocharger 12 is in its full boosting with the aid of the control panel 29, a push switch 26 is turned on as occasion to open a control valve 23, which causes the cooling gas in a spray can unit 21 to be fed through a tube 24 to gas injection nozzles disposed in the intercooler unit 14 and to be injected toward cooling fins for their effective cooling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an intercooler mounted on a turbocharger of a turbocharged engine of an automobile or the like to cool intake air to the engine.

[0002]

2. Description of the Related Art Gasoline engines for automobiles and the like are roughly classified into four-stroke engines and two-stroke engines according to the relationship between the piston stroke and the cycle, but the crankshaft makes one revolution with one reciprocation of the piston. That is, a 4-cycle engine that performs one cycle of compression / combustion / expansion / exhaust by two rotations of the crankshaft has become the mainstream of automobiles, small ships, and small aircraft. This gasoline engine has a very fast flame propagation speed of fuel, so there is no limit on combustion in the rotational speed, and the rotational speed can be easily obtained by advancing the ignition timing as the rotational speed increases. Although it is possible to obtain high horsepower with this engine, simply increasing the displacement will cause deterioration of fuel efficiency and engine weight, so it is not suitable for "high performance engine" mounted in racing cars and sports cars. is there. Then, what was conceived was to make the mechanism of the engine body higher so as to improve the output without changing the displacement.

Representative examples of improving the output by increasing the mechanism of the engine body are DOHC and multi-valve. The DOHC engine is an engine that has two camshafts arranged above the combustion chamber and has a mechanism that moves the intake valve and the exhaust valve by the respective camshafts. It is possible to increase the intake and exhaust valve diameters and the inertia of the valve operating system. It has features such as reduced weight and increased allowable rotation speed of the valve train, and can be used up to high rotation speeds. This type of engine is the overwhelming majority of the engines installed in racing cars. In addition, a multi-valve engine has been commonly used in which two valves are increased to four per cylinder to improve intake and exhaust efficiency.

On the other hand, it is generally well known that the output can be improved by adding a supercharger to the intake system of a conventional engine. A supercharger is a method of increasing the output by sending a large amount of air-fuel mixture into a cylinder, and there are a turbocharger and a supercharger as typical superchargers. The turbocharger uses the energy of the exhaust gas to rotate the turbine for supercharging, whereas the supercharger directly uses the rotational force of the engine to rotate the rotor for supercharging. Since a turbocharged engine converts exhaust energy into boost pressure, a large torque can be obtained from medium speed to high speed with a large amount of exhaust gas, but a so-called turbo lag pickup delay, that is, reaction or acceleration to accelerator operation. There will be a time delay in the rise of the torque at the time,
It is suitable for high-speed engine because of high charging efficiency in high speed range. On the other hand, in the engine with a supercharger, the rotational force of the crankshaft is directly transmitted to the rotor by a belt to obtain the boost pressure. Due to this direct drive, a uniform torque improvement from low speed to high speed has been obtained, and it is possible to react sensitively to accelerator operation, but due to the large inertial mass of the supercharger impeller, it is suitable for high-speed rotation. Is not suitable for.

As described above, the turbocharger, which has been firmly established as an engine for racing cars and sports cars, has entered the second generation, and the turbo lag is reduced from when the accelerator is depressed until when supercharging is started, and the engine speed is low. Various improvements have been made to improve the effect. For example, using ceramics for the shaft and blades to reduce the weight, changing the angle of the nozzle installed in the turbine to speed up the flow rate of exhaust gas at low revolutions, twin twin chargers instead of one Turbochargers are also in practical use. According to this, it is theoretically possible to improve the output by 30% to 50% or more. This is because an engine with a turbocharger can obtain a large explosive force only by forcibly sending atmospheric pressure into the cylinder by the turbocharger and maintaining a high compression ratio in the cylinder. However, it is not so easy in reality, and the durability and reliability of the engine may be greatly sacrificed due to abnormal combustion due to high compression, thermal fatigue of the engine material, distortion due to the temperature of the drive system, etc. There is a limit to increasing pressure.
The intercooler was conceived there.

The intercooler is a kind of cooling device like the radiator and the oil cooler, but unlike the radiator that cools the engine body with water or air and the oil cooler that cools the engine oil, it is pressurized by a turbocharger. It cools the gas supplied to the engine with the atmosphere or water, and is installed between the turbocharger and the intake manifold. As a result, if the intercooler cools the intake body that has been pressurized by the turbocharger and has risen in temperature and the air density has dropped, the intake body supplied to the engine cylinder will have a high air density, It is said that the efficiency will increase and a significant improvement in horsepower and torque can be expected.

[0007]

However, in the case of the water cooling type, the conventional intercooler described above has a large mass of water, and a complicated cooling system and a large amount of water for effective cooling. Therefore, in a racing car or a sports car in which the power weight ratio is extremely important, a fatal point such as an unnecessary increase in weight becomes a problem. Further, even in the case of the air-cooling type intercooler, even if the weight problem of the water-cooling type does not occur, the cooling effect greatly varies depending on the place where the intercooler is installed. Therefore, in vehicles equipped with a front engine, an intercooler can be installed near the radiator to make it easier to introduce cool air, or as shown in FIG.
In a vehicle equipped with a rear engine, the intercooler 2 is provided on the upper surface of the engine body 1, and the ventilation panel 5 is provided on the engine lid 4 integrated with the rear spoiler on the upper surface of the engine room 3 to introduce outside air into the engine room 3. However, since either method is greatly affected by the outside temperature, it is effective in operation under severe conditions for the engine, such as running in hot weather with high outside temperature or full open running with high thermal efficiency of the engine. A crucial problem such as the inability to obtain effective cooling air has not been solved. Therefore, the present invention uses these conventional intercoolers as a basic unit, and is able to obtain the cooling air extremely effectively when needed without being affected by the air permeability of the engine room or the outside air. Offering is an issue.

[0008]

In view of the above problems, the invention according to claim 1 cools the intake air of an engine with a turbocharger by using air or water and increases the charging and charging efficiency of the intake air charged by the turbocharger. An intercooler for an engine with a turbocharger that improves the gas injection nozzle member that is inserted through the cooling fins of the intercooler for the engine with a turbocharger, and a gas that is detachably attached to the gas injection nozzle member. Supply pipe member or gas supply hose member, gas supply control unit detachably attached to the gas supply pipe member or gas supply hose member, and cooling gas detachably attached to the gas supply control unit to supply cooling gas An engine with a turbocharger, characterized by comprising a pressure accumulator and It is obtained by the intercooler. According to the second aspect of the present invention, in the gas injection nozzle member, a plurality of gas injection holes penetrating from the outer diameter surface to the inner diameter portion of the pipe member having a hollow interior of a predetermined length are formed at regular intervals. good. According to the invention of claim 3, the gas supply control unit may output an injection signal to the gas injection nozzle member in response to a signal that a switch provided in the operator's cab is turned on. According to the invention of claim 4, the gas supply control unit may cause the gas injection nozzle member to inject gas at a predetermined timing according to a detection signal from an intake air temperature sensor provided in the intercooler. . According to the invention of claim 5, in the cooling gas pressure accumulating section, a plurality of cooling gas cylinders may be arranged and the whole may be housed in the heat insulating case.

According to the first to fourth aspects of the invention, first, when the cooling gas cylinders are arranged in the cooling gas pressure storage section housed in the heat insulating case, the cooling gas filled in the cooling gas cylinders is discharged from the cooling gas pressure storage section. Pressure is supplied to the gas supply control unit via the gas supply pipe member or the gas supply hose member. Therefore, when the switch provided in the driver's cab is turned on, the gas supply control unit reads the ON signal from the switch and supplies the cooling gas pressurized and supplied to the gas supply control unit to the injection nozzle member. As a result, the gas is injected from the gas injection nozzle member that penetrates the cooling fins of the intercooler to the cooling fins, and a layer of cooling gas is formed around the cooling fins, which is added by the turbocharger. The compressed air supplied to the intercooler is instantaneously cooled by the evaporation action of the cooling gas and supplied to the intake manifold of the engine. Further, the same effect can be obtained even if the gas supply control unit causes the gas injection nozzle member to inject the gas at a predetermined timing according to the detection signal from the intake air temperature sensor provided in the intercooler.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Regarding an embodiment to which an intercooler of an engine with a turbocharger of the present invention is applied,
This will be described with reference to the drawings. FIG. 2 is a perspective view showing the appearance of an intercooler to which the present invention is applied, and FIGS. 3 and 4 are explanatory views showing the internal structure of the intercooler. The appearance of the intercooler of this embodiment is composed of four cooling cells 7 sandwiched between the intercooler body frames 6 as shown in FIG. Further, an intake pipe 8 for introducing the air supplied from the turbocharger into the cooling cell 7, an exhaust pipe 9 for discharging the air cooled by the cooling cell 7 to the outside, and a cooling fin 7a.
And a cooling gas supply pipe 10 for supplying a cooling gas to the.

On the other hand, as shown in FIG. 3 (a), the internal structure of the intercooler of this embodiment is such that the cooling gas supply pipe 10 is provided inside the intercooler body frame 6 on the intake pipe 8 side to which the turbocharger is connected. Is provided with a connection pipe 10a communicating with the
As shown in FIG. 3B, a long nozzle unit 10b extends downward from the a so as to project downward in a branched shape and the tip of the nozzle unit 10b is inserted into the cooling fin 7a of the cooling cell 7. I have put it out. In addition, this nozzle unit 10
In b, a plurality of injection nozzles 10c for ejecting the cooling gas so as to be emitted to the inside of the cooling fin 7a are formed. As shown in FIG. 3B, the cooling cell 7 has a structure in which a large number of folded long cooling fins 7a are sandwiched by pressing plates 7b from both sides. As described above, the nozzle unit 10b is inside the cooling fins 7a. It penetrates through. In this way, as shown in FIG. 4, all of the plurality of nozzle units 1 are provided inside the cooling unit 7.
0b is inserted, and these are connected to the cooling gas supply pipe 10 through the connection pipe 10a.

Next, a specific mounting structure, mounting method and operation of the intercooler of this embodiment will be described with reference to the drawings. FIG. 5 is a system diagram in which two intercoolers of this embodiment are applied to a twin turbo 6-cylinder engine. The twin-turbo 6-cylinder engine used in the present embodiment is, as shown in the figure, a left-right 3-cylinder cylinder bank 11
It is a twin turbo engine equipped with a turbocharger 12 for each, and the basic layout is as follows. First, the air intake 13 that introduces outside air into the turbocharger 12,
The twin intercooler unit 14 supplied with the booster from the turbocharger 12, the intake manifold 15 supplying the cool air from the unit to the engine, the throttle valve 16, and the exhaust gas of the engine from the turbocharger 12
Exhaust manifold 17 to be sent to the drive side of the vehicle, a waste gate valve 18 provided there, and an exhaust bypass pipe 1 for communicating the exhaust manifold 17
9, an exhaust muffler 20 for receiving exhaust gas, a spray can unit 21 in which one or more cooling gas spray cans including a CFC-based refrigerant are detachably mounted and stocked, and these spray can units 21 are protected from shock and high temperature A heat insulating case 22 made of styrofoam, a control valve 23 for supplying or shutting off the cooling gas supplied from the spray can unit 21 according to a signal from the outside, and a cooling gas supplied from the control valve 23 for the twin intercooler unit 14 A flexible pipe or a flexible tube 24, a control unit 25 for controlling the opening and closing of the control valve 23 according to a signal from the outside or a previously stored program,
A push switch 26 for manually inputting a cooling gas injection signal to the control unit 25, a temperature sensor 27 for detecting the ventilation temperature of the twin intercooler unit 14 and outputting it to the control unit 25, ON / OFF of the control unit 25, and manual / automatic Control panel 29 for displaying various commands processed by master switch 28 and control unit 25 for switching
It is composed of Control unit 25 is C
It is a so-called microcomputer including a PU, a ROM, a RAM, an I / O port, and a bus line connecting these.

Here, the twin turbo 6 having the above structure
The action and effect of the intercooler of the present embodiment in the cylinder engine will be described based on FIG. First, when the master switch 28 provided in the driver's seat is turned on, the control unit 25 constantly reads the ventilation temperature of the twin intercooler unit 14 detected by the temperature sensor 27,
It is displayed on the control panel 29. When the engine is started in this state and the vehicle is in the running state, the control panel 29
Indicates the intake air temperature that has risen due to the addition of the turbocharger 12. Therefore, the driver monitors the ventilation temperature of the twin intercooler unit 14 when the turbocharger 12 is at full boost, such as during full-open acceleration, and turns on the push switch 26 as necessary. Then, the control unit 25 reads the signal from the push switch 26 and immediately outputs an open signal to the control valve 23. The control valve 23 cuts off the cooling gas, which has been blocked until then, through a flexible pipe or a flexible tube 24.
It is supplied to the cooling gas supply pipe 10 of the intercooler main body frame 6 shown in FIG. As a result, the cooling gas flows from the connection pipe 10a into the nozzle unit 10b, and is injected from the injection nozzle 10c into the cooling fins 7a of the cooling cell 7. Due to this action, the vicinity of the cooling fin 7a is instantaneously reduced by about -20 regardless of the outside air temperature.
It will be lowered almost once. As a result, the supplied intake air flowing through the cooling cell 7 of the intercooler body frame 6 is also rapidly cooled, and high-density intake air is supplied to the intake manifold 15 of the engine.

Due to this action, the boost pressure of the turbocharger at the time of acceleration of the turbocharged engine is instantaneously increased from a normal value, and even under a severe condition such as a high outside air temperature or hot weather for the turbocharged engine. It has become possible to fully demonstrate the performance of the turbo engine. Also, R of the control unit 25
The twin intercooler unit 14 detected by the temperature sensor 27 is stored in advance in the OM with a program for sequential control or feedback control of the injection conditions and injection timing of the cooling gas injected by the nozzle unit 10b.
If the control unit 25 outputs an injection command to the nozzle unit 10b according to the ventilation temperature of
From small displacement engines for light vehicles to large displacement turbo engines for large trucks, it will be possible to fully demonstrate its performance. It should be noted that in the above-described embodiment, the one-stage turbo engine in which two banks of the engine are respectively used by the two turbocharger units is explained, but the present invention is not limited to this, and one turbocharger unit is used. It is equipped with a single turbo engine that handles both banks of 6 cylinders and two turbocharger units of different sizes for low speed and high speed, and uses two turbos in two stages to smoothly raise the supply effect from low speed, The same effect can be obtained by applying it to a two-stage twin turbo engine that pulls to the peak power range as it is. The cooling gas accumulator may include a plurality of cartridges in which a plurality of cooling gas cylinders are mounted side by side, and the entire cartridge may be housed in a heat insulating case. It is also possible to mount the four cooling gas injection nozzle units 2c near the upper surface, the lower surface, the side surface, etc. of the four cooling cells 4c, respectively.

[0015]

As described above in detail, according to the inventions according to claims 1 to 5, the boost pressure of the turbocharger during acceleration of the engine with the turbocharger is instantaneously increased from a normal value, or the turbocharger is boosted. For the engine with a charger, it has become possible to fully demonstrate the performance of the turbo engine even under harsh conditions such as high outside temperatures and hot weather. The gas supply control unit stores in advance a program for sequential control or feedback control of the injection conditions and injection timings of the cooling gas injected by the gas injection nozzle member, and the gas supply control unit operates in accordance with the temperature detected by the intake air temperature sensor. By outputting an injection command to the gas injection nozzle member, it will be possible to fully demonstrate the performance from small displacement engines for light vehicles to large displacement turbo engines for large trucks. It is an epoch-making invention that has succeeded in perfectly complementing the weaknesses of the engine with the engine and bringing out its performance perfectly.
The benefits to the automobile industry are enormous.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle equipped with a rear engine, which is an example of a conventional technique related to the present invention.

FIG. 2 is a perspective view showing the appearance of an intercooler of an embodiment to which an intercooler for a turbocharged engine of the present invention is applied.

FIG. 3A is a partially cutaway perspective view showing the internal structure of an intercooler of an embodiment to which an intercooler for a turbocharged engine according to the present invention is applied, and FIG. 3B is a cutaway front view of the same portion.

FIG. 4A is a partially cutaway plan view showing the internal structure of the intercooler of the embodiment to which the intercooler of the engine with a turbocharger of the present invention is applied, and FIG. 4B is a transverse sectional view.

FIG. 5 is a twin turbo 6 for the intercooler of the present embodiment.
It is a system diagram applied to a cylinder engine.

[Explanation of symbols]

 1 Engine Body 2 Intercooler 3 Engine Room 4 Engine Lid 5 Ventilation Panel 6 Intercooler Body Frame 7 Cooling Cell 7a Cooling Fin 7b Pressing Plate 8 Intake Pipe 9 Exhaust Pipe 10 Cooling Gas Supply Pipe 10a Connection Pipe 10b Nozzle Unit 10c Injection Nozzle 11 3 cylinder cylinder bank 12 turbocharger 13 air intake 14 twin intercooler unit 15 intake manifold 16 throttle valve 17 exhaust manifold 18 waste gate valve 19 exhaust bypass pipe 20 exhaust muffler 21 spray can unit 22 insulation case 23 control valve 24 flexible pipe or flexible Tube 25 Control unit 26 Push switch 27 Degree sensor 28 master switch 29 control panel

Claims (5)

[Claims] 1. An intercooler for a turbocharged engine, which cools intake air of a turbocharged engine with air or water to improve charge-charging efficiency of intake air charged by the turbocharger. A gas injection nozzle member penetratingly attached to a cooling fin of an intercooler of an engine, a gas supply pipe member or a gas supply hose member detachably attached to the gas injection nozzle member, and the gas supply pipe member or gas supply An engine with a turbocharger, comprising a gas supply control unit detachably attached to the hose member, and a cooling gas pressure storage unit detachably attached to the gas supply control unit to supply cooling gas. Intercooler. 2. The gas injection nozzle member is characterized in that a plurality of gas injection holes penetrating from an outer diameter surface to an inner diameter portion of a pipe member having a hollow inside of a predetermined length are formed at regular intervals. An intercooler for an engine with a turbocharger according to claim 1. 3. The gas supply control unit is configured to output an injection signal to the gas injection nozzle member in response to a signal indicating that a switch provided in a driver's cab is turned on. Intercooler for turbocharged engine described in. 4. The gas supply control unit causes the gas injection nozzle member to inject gas at a predetermined timing according to a detection signal from an intake air temperature sensor provided in the intercooler. An intercooler for a turbocharged engine according to Item 1. 5. The intercooler for an engine with a turbocharger according to claim 1, wherein the cooling gas pressure accumulating section has a plurality of cooling gas cylinders arranged side by side and accommodated entirely in a heat insulating case.