JPH0227159Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an internal combustion engine with a turbocharger, which is equipped with a turbocharger and an exhaust gas recirculation device, and controls a fuel injection mechanism by taking in supercharging pressure of the turbocharger from an intake passage.

BACKGROUND OF THE INVENTION Turbochargers and exhaust gas recirculation systems (EGR systems) are well known systems. Since the amount of intake air increases when the turbocharger is operating, diesel engines have a fuel increase mechanism known as a boost compensator attached to the fuel injection pump. The air pressure is taken into account. Such a supercharging pressure intake hole is provided in the surge tank, and an EGR passage is further opened in the surge tank. In order to ensure that the exhaust gas recirculated to the surge tank is evenly distributed to each cylinder of the engine, the opening of the EGR passage is generally formed approximately at the most upstream side of the surge tank. Therefore, the above-mentioned boost pressure intake is located downstream of the EGR passage opening, and therefore a portion of the exhaust gas flows from the boost pressure intake into the boost compensator.
Negative effects from carbon clogging, dirt, and heat will occur, reducing the controllability of the boost compensator.

Purpose of the invention The purpose of the invention is to maintain normal function of the fuel injection mechanism without being adversely affected by the above-mentioned exhaust gas.

Structure of the invention The present invention is characterized in that a supercharging pressure intake part for controlling the fuel injection mechanism is provided upstream of the opening of the exhaust gas recirculation passage to the intake passage.

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

In FIG. 1, an engine main body 1 is connected to a turbine of a turbocharger 3 through an exhaust manifold 2. As shown in FIG. The intake air passage passes through the compressor of the turbocharger 3 and is connected to the engine body 1 through a compressor elbow 4, an air connector pipe 5, an intake manifold or a surge tank 6.

The EGR pipe 7 is connected from the exhaust manifold 2 to the intake manifold 6 via the EGR valve 8, and is connected to the number 9
It opens into the intake manifold 6 at approximately the most upstream position of the intake manifold 6 as shown in FIG.

A diesel engine has a fuel injection pump 10 and is fitted with a fuel increasing mechanism 11 known as a boost compensator. The fuel increase mechanism 11 is controlled by taking in the supercharging pressure of the turbocharger 3. For this purpose, the compressor elbow 4 is provided with a supercharging pressure intake hole 12, and a pipe 13 is attached to the hole 12. 13 is connected to the operating pressure receiving port 14 of the fuel increase mechanism 11.
As can be seen in FIG. 1, the intake air flows sequentially through an air cleaner (not shown), the compressor of the turbocharger 3, the compressor elbow 4, the air connector pipe 5, and the intake manifold 6. The air connector pipe 5 is located upstream of the intake manifold 6. The opening 9 of the EGR pipe 7 is located in the intake manifold 6, and the boost pressure intake hole 12 is located upstream of the opening 9.

By providing the supercharging pressure intake hole 12 upstream of the opening 9 in this way, the air taken out from the intake hole 12 as a signal pressure can be used to absorb carbon and gas in the exhaust gas introduced from the EGR passage 7. The pipe 13 and the fuel increase mechanism 11 do not come into contact with the monster.
will not be adversely affected by such things. Therefore, the normal functions of the fuel increasing mechanism and the EGR device are maintained, and clogging of the port 14 and soot accumulation, deposit accumulation, and corrosion on the fuel increasing mechanism 11 are prevented.

In FIG. 2, a boost pressure intake hole 12 is provided in the intake manifold 5 at a position slightly upstream of the EGR opening 9, and the intake hole 12 has a direction toward the intake air flow indicated by the solid arrow. A vent pipe 15 that opens is inserted. vent pipe 15
is connected to a pipe 13 leading to the fuel increase mechanism 11. Since the vent pipe 15 opens towards the air flow, even if the boost pressure intake hole 12 is placed close to the EGR opening 9, the exhaust gas flows from the opening 9 as shown by the dotted arrow. not be influenced by. As a result, the length of the pipe shown at 13 in FIG. 1 can be shortened, and the responsiveness of the fuel increasing mechanism can thereby be improved.

Effects As explained above, according to the present invention, the function of the fuel injection mechanism can be maintained without being adversely affected by the exhaust gas flowing in from the EGR passage.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an internal combustion engine with a turbocharger according to the present invention, and FIG. 2 is a sectional view showing a variation of the supercharging pressure intake part. 1...Engine body, 2...Exhaust manifold, 3...
...Turbo charger, 4...Compressor vent, 5...Air connector pipe, 6...Intake manifold, 7...EGR pipe, 9...EGR opening,
10...Fuel injection pump, 11...Fuel increase mechanism, 12...Supercharging pressure intake hole, 15...Bent pipe.

Claims (1)

[Scope of utility model registration request] In an internal combustion engine that is equipped with a turbocharger and an exhaust gas recirculation device, and further controls the fuel injection mechanism by taking in the boost pressure of the turbocharger from an intake passage, a boost pressure intake part for controlling the fuel injection mechanism An internal combustion engine with a turbocharger, characterized in that the exhaust gas recirculation device is provided upstream of an opening to an intake passage.