JPH03242422A - Subchamber type diesel engine - Google Patents

Abstract

PURPOSE:To prevent unburnt fuel and an intermediate product from being discharged while suppressing production of NOx by arranging a heat resisting plate unit, having a heating element, in a subchamber. CONSTITUTION:A heat resisting plate unit 6, which is for fuel from a fuel injection nozzle 4 of injecting the fuel to collide in a direction of a communication hole 16 on the center axis of a subchamber 2, is arranged therein. The plate unit 6 is provided with a heating element 21 controlled by a controller 20. In this way, the fuel, injected from the fuel injection nozzle 4, collides against the plate unit 6 to form a circular film, and ignition is surely caused while promoting mixing with intake air to produce a good mixture. Ignition combustion to the fuel is surely and promptly attained by heating of the heating element 21 at the time of a partial load or the like at a low temperature. Accordingly, unburnt fuel and an intermediate product are prevented from being discharged by performing good combustion while suppressing production of NOx.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sub-chamber type diesel engine in which a main chamber and a sub-chamber are communicated through a communication hole.

[Conventional technology]

Conventionally, a stratified air supply engine, in which the central part of the piston head of a piston protrudes to form a collision part and a concave cavity is formed around the collision part, utilizes the collision jet of fuel.
A methanol engine with a KA-type combustion chamber has been disclosed (e.g. 'Internal Combustion Engine-l Vol. 27,
No. 345, July 9, 1988, pp. 35-42). In an internal combustion engine having such a combustion chamber, fuel injected from a single-hole nozzle of a fuel injection nozzle collides with a flat protrusion of a piston head and spreads in a disk shape, and then due to the squish flow caused by the upward movement of the piston, the fuel is is forced into the lower part of the cavity and mixes with air to form a mixture.

Furthermore, in the combustion chamber structure of an internal combustion engine disclosed in Japanese Utility Model Application Publication No. 58-79018, a part of the combustion chamber is formed by an annular member made of ceramics, and the annular member crosses the combustion chamber. It has a rod-shaped portion, and a heating element is embedded in the rod-shaped portion.

Furthermore, Japanese Patent Application No. 118245 filed by the present applicant
No. 3 discloses an adiabatic alcohol engine in which a pre-chamber G is provided with a red-hot body. A cough cut alcohol engine includes an inner wall of a combustion chamber having a sectioned structure made of a material with low thermal conductivity, an alcohol fuel injection nozzle arranged in the combustion chamber, and a wall surface of the inner wall with which the injected alcohol from the injection nozzle collides. There is a red rail body which detects the operating status of the engine from a ceramic material with a high capacitance placed in the middle, and a sensor that detects the operating condition of the engine. It is housed in a controller that controls turning off the red-hot body.

[Problems to be Solved by the Invention] However, in the combustion chamber structure of the internal combustion engine disclosed in the above-mentioned Japanese Utility Model Application Publication No. 58-79018, a heating element is provided in the auxiliary combustion chamber to promote vaporization of the fuel. , it is not aimed at producing a good mixture of injected fuel and air.

By the way, in an engine using a piston equipped with the above-mentioned 03KA type combustion chamber, the collision surface on which the fuel injected from the single-hole nozzle collides is a flat protrusion of the piston head, and the fuel collides with the protrusion. There is a phenomenon in which the particles diffuse into a disk shape. Therefore, it is conceivable to utilize the phenomenon in which the fuel injected from the fuel injection nozzle spreads in a disc shape in the subchamber to generate a good mixture of intake air and fuel, thereby improving the combustion state. Furthermore, it is conceivable to provide a heating element in the pre-chamber to further improve the combustion state during partial load and startup.

The purpose of this invention is to solve the above problems,
In order to generate a mixture of injected fuel and air in the auxiliary chamber, we focused on the pattern of the fuel spray trajectory by the combustion chamber of the 03KA type, placed a plate such as a disk in the auxiliary chamber, and used a cough plate as a cough plate. Fuel is injected at low pressure from the fuel injection nozzle, and the injected fuel collides with the plate and is uniformly dispersed in a circular film shape, and is completely different from the mixing in the combustion chamber of the 03KA type. The air introduced from the chamber into the auxiliary chamber through the communication hole is allowed to flow in without generating a swirl, and the flow direction of the incoming air and the fuel injection direction of the fuel which is diffused and injected in a disc shape are made to intersect in a substantially orthogonal state. In order to promote mixing and control the temperature in the subchamber to the optimum level, a heating element is provided on the plate, and when the temperature is low, such as during partial load, the heating element is heated to immediately raise the plate. A pre-chamber type diesel engine that collides fuel to assist ignition combustion, ensures good combustion, prevents the emission of unburned fuel or intermediate products, and suppresses NOXO generation by causing the main combustion to occur in the pre-chamber. The purpose is to provide an engine.

[Means to solve the problem]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides a sub-chamber disposed at the throat of a cylinder, a communication hole that communicates the sub-chamber with the main chamber, a fuel injection nozzle that injects fuel onto the central axis of the sub-chamber, and a fuel injection nozzle that injects fuel from the fuel injection nozzle. The present invention relates to a pre-chamber type diesel engine having a heat-resistant plate disposed within the pre-chamber substantially perpendicular to the fuel injection direction to cause the injected fuel to collide.

Further, in this pre-chamber type diesel engine, the plate body is disposed substantially perpendicular to an axis connecting the nozzle of the fuel injection nozzle and the communication hole, and the plate body is fixed to a wall body of the pre-chamber. and is supported by a bracket with fluid ports.

The pre-chamber diesel engine also includes a sensor that detects the operating state of the engine, and a controller that controls turning on and off the heating element in response to a detection signal from the sensor.

[Operation] The pre-chamber type diesel engine according to the present invention is constructed as described above and functions as follows. That is, this sub-chamber type diesel engine has a sub-chamber disposed in the cylinder head and a communication hole that communicates the sub-chamber with the main chamber, and a fuel injection nozzle that injects fuel onto the central axis of the sub-chamber. In order to cause the injected fuel to collide, a heat-resistant plate is disposed in the auxiliary chamber almost perpendicular to the fuel injection direction, so that the fuel injected at low pressure from the fuel injection nozzle collides with the plate and forms a disc. Spread evenly. Therefore, the inflow direction of the air flowing from the main chamber into the auxiliary chamber through the communication hole without causing swirl and the fuel injection direction of the fuel that is injected while being diffused in a disk shape intersect at right angles to promote mixing. . In addition, in order to adjust the temperature of the plate in the auxiliary chamber to the optimum temperature, a heating element is provided on the plate, and when the temperature is low, such as during partial load, the heating element is applied to immediately raise the plate to maintain a good temperature. It is possible to perform searing to prevent the discharge of unburned fuel or intermediate products, and to perform main combustion in the auxiliary chamber to suppress the generation of No.

Furthermore, this pre-chamber type diesel engine includes a sensor that detects the operating state of the engine, and a controller that turns on the heating element in response to a detection signal such as a partial load below a predetermined value from the sensor. At low temperatures such as during partial load, the heating of the heating element reliably and quickly ignites and burns the fuel, suppresses the generation of unburned gas, improves startability, and improves engine efficiency.

In addition, since this injection system injects fuel in liquid form, it is possible to use large-diameter nozzle holes and perform fuel injection in a short time. is produced quickly, and combustion is therefore rapid, resulting in excellent cycle efficiency.

(Embodiments) Hereinafter, embodiments of the pre-chamber type diesel engine according to the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the pre-chamber type diesel engine according to the present invention, and FIG. 2 is a plan view showing an example of a plate disposed in the pre-chamber shown in FIG.

As shown in FIG. 1, this sub-chamber type diesel engine includes a main chamber 1, a sub-chamber 2 disposed above the main chamber 1, and a fuel injection nozzle 4 having a nozzle 17 opened in the center of the sub-chamber 2. Consists of. The wall body 5 constituting the subchamber 2 is connected to the cylinder and the rad 3
It is arranged in a hole 9 formed in. The cylinder head 3 is fixed to the cylinder block 8 via a gasket 30. A cylinder liner 10 is fitted into a cylinder formed in the cylinder block 8. The main chamber 1 is formed in a region surrounded by the lower surface of the cylinder head 3, the cylinder liner 10, and the upper surface of the piston head of the piston 11. The communication hole 16 that communicates the main chamber 1 and the sub-chamber 2 is
It is formed on the lower surface of the cylinder head 3. here,
The auxiliary chamber 2 and the communication hole 16 may be configured to have a heat insulating structure. A communication hole 16 that communicates the main chamber 1 with the auxiliary chamber 2 is formed perpendicularly to the lower surface of the throat of the cylinder, and is inserted into the cylinder so that the intake air flowing from the main chamber 1 into the auxiliary chamber 2 is pushed in so as not to generate a swirl. Ru. In addition, the wall body 5 constituting the subchamber 2
Although shown in the figure, is composed of an upper wall body 5A and a lower wall body 5B, the structure is not limited to this, but it can also be composed of a wall body divided into two in the axial direction, for example. Moreover, the subchamber 2 and the communication hole 16 may be formed by casting.

In this pre-chamber type diesel engine, an exhaust port 14 is formed in the cylinder head 3.
An exhaust valve 13 is arranged so as to be opened and closed by being guided by the pulp guide. Further, in this pre-chamber type diesel engine, the intake boat may be formed in the cylinder head, although not shown, or in the lower part of the cylinder block into which the cylinder liner is fitted. You can also use it as

This pre-chamber type diesel engine is particularly characterized by the structure of the pre-chamber 2 and its control. A hole 16, a fuel injection nozzle 4 that injects fuel onto the central axis of the sub-chamber 2, and a circle arranged in the sub-chamber 2 substantially perpendicular to the fuel injection direction to cause the fuel injected from the fuel injection nozzle 4 to collide. It has a plate body 6 such as a plate, and a heating element 21 provided on the plate body 6. This plate body 6 is connected to the nozzle 1 of the fuel injection nozzle 4.
The plate body 6 is arranged on the axis connecting the fuel injection direction of the fuel injected from the connecting hole hole 6 and the center part of the connecting hole hole 6. Supported by Particularly, as shown in FIG. 2, the bracket 7 is provided with a fluid vent 12 for passing fluid such as intake air flowing from the main chamber 1 into the auxiliary chamber 2 and flames jetting out from the auxiliary chamber 2 to the main chamber 1. We are prepared. This heating element 21 is made of, for example, silicon nitride (Si, I'+4
), a glow plug, a hot plug, an E-tube, etc., in which a conductor such as tungsten is embedded in a plate 6 made of a ceramic material such as silicon carbide (SiC) or a composite material, can be used to fill the groove bottom. In addition, the fuel injection nozzle 4 is attached to the cylinder through a mounting hole 19 formed in the nozzle 3 and a mounting hole 1 formed in the wall body 5.
The nozzle 17 of the fuel injection nozzle 4 is opened on the upper surface of the wall 5 so as to face the plate 6 .

In this pre-chamber type diesel engine a, the heating element 21 provided on the plate 6 is supplied with current from the 1iB 26 through the line 27, and when the switch 25 is turned on and off according to commands from the controller 20, The temperature of the main fabric body 6 is thereby controlled. That is, the plate 6 is heated by flowing a current through the conductor of the heating element 21. Detection signals from each sensor that detects the engine operating state are input to the controller 20, such as a temperature detection signal from a temperature sensor 24 that detects the temperature of the plate 6 or the wall temperature of the subchamber 2, and the engine rotation speed. A rotation detection signal from a rotation sensor 23 that detects the engine load, and a load detection signal from the load sensor 22 that detects the engine load are input. The temperature of the temperature sensor 24 can be detected, for example, by measuring the resistance value of the heating element 21 and predicting the temperature, or by detecting the temperature of the subchamber 21.
The temperature can be detected by providing a temperature sensor such as a thermistor on the wall 5. The engine rotation speed can be detected by measuring the crankshaft rotation speed with a rotation sensor. Further, the engine load can be detected by measuring the amount of depression of the accelerator pedal or the flow rate of fuel injected from the fuel injection nozzle 4. The controller 20 receives each detection signal from each sensor, and performs control to turn on and off the switch 25 of the heating element 21 in response to the detection signal. For example, when the engine is under partial load or when starting, the temperature of the plate 6 is low and HC1 unburned gas is generated, which may reduce startability, engine efficiency, etc., so the controller 2
0 turns on the heating element 21, energizes the heating element 21, heats the plate 6, promotes vaporization of the injected fuel, improves starting performance and ignition performance, and prevents misfire from occurring.

Further, the injection port 17 of the fuel injection nozzle 4 in this pre-chamber type diesel engine is formed as a single injection hole, and fuel is injected from the fuel injection nozzle 4 at low pressure. The injected fuel injected at low pressure collides with the flat surface of the plate 6 while remaining in a liquid state without vaporizing, and forms a disk-shaped trajectory 15 along the surface.
That is, it becomes a fuel film and diffuses into the subchamber 2. There, it mixes with the non-swirl air flow flowing from the main chamber 1 into the auxiliary chamber 2, ignites, vaporizes, and burns.

In this circular film, the fuel becomes more dilute toward the outer periphery, and the fuel mixes with air faster toward the outer periphery.

Moreover, the fuel located on the outer periphery of the circular fuel film has an earlier injection timing, and a longer activation time and vaporization time. Then, the fuel film is burned from the outer periphery toward the center. Furthermore, when the engine is operating at low speed and low load, if the plate body 6 is at a low temperature, the plate body 6
The fuel that collides with and adheres to the heating element 21 is blown out from the auxiliary chamber 2 to the main chamber 1 as unburned gas.
to immediately raise the temperature of the plate 6 in the auxiliary chamber 2, raise the temperature of the plate 6 to suppress the generation of unburned gas, and prevent unburned gas from being blown into the main chamber 1. Also, the unburned gas can be completely combusted in the main chamber 1 and exhausted from the exhaust port 14.

In this pre-chamber type diesel engine, depending on the case, the pre-chamber 2 and the communicating hole 16 may be groove-bottomed with a highly insulating structure to maintain the pre-chamber 2 and the communicating hole 16 at a high temperature.

When configuring the subchamber 2 and the communication hole 16 with a heat insulating structure,
Although the walls 5 of the subchamber 2 and the communication hole 16 are not shown,
For example, a heat insulating member made of a low thermal conductivity material such as aluminum titanate or potassium titanate, a metal outer cylinder fitted to the outer periphery of the cut member, and silicon nitride (SixN4) or silicon carbide placed on the inner surface of the heat insulating member. The inner wall body may be made of a heat-resistant ceramic material such as (SiC) or a composite material.

Next, the operation of the pre-chamber type diesel engine according to the present invention will be explained with reference to FIGS. 1, 2, and 3. FIG. 3 is a process flow diagram showing an example of the operation of the pre-chamber type diesel engine according to the present invention.

When the engine starts, the fuel injection pump and the like are driven and controlled. First, as a first step, by driving the engine, the engine rotation speed X is detected by the rotation sensor 23, the detection signal is manually input to the controller 20, and the load sensor 22 detects the engine load. The detection signal is input to the controller 20, and the wall temperature T of the auxiliary chamber 2 or the plate 6 is detected by the temperature sensor 24, and the detection signal is input to the controller 20 (step 30).

In the controller 20, the engine rotation speed X detected by the rotation sensor 23 is a predetermined rotation speed N, which is calculated in advance. A comparison is made to determine whether or not the value is larger than that (step 31).

The engine rotation speed N is a predetermined rotation speed N. If it is smaller, the engine is running at low speed and the plate 6 disposed in the auxiliary chamber 2 is not at a high temperature, so fuel is injected from the fuel injection nozzle 4 onto the plate 6 and collided with it. However, the injected fuel cannot take away the heat of vaporization from the wall surface, so the heating element 21 is turned on by a command from the controller 20.
A current is supplied to the conductor of the heating element 21. T! The heating element 21 supplied with the first flow is heated by electric power, and the plate 6 becomes high in temperature (step 35).

The engine rotation speed NE is a predetermined rotation speed X. If it is larger, it is determined that the engine is running at high speed and the plate 6 is at a high temperature.Then, the load sensor 22 detects the engine load, and the controller 20 determines the engine load in advance. A comparison is made to determine whether or not the engine load is greater than the calculated predetermined engine load LE0 (step 32).

The engine load is the same as the engine load. If it is smaller, the engine is under low load and the plate 6 in the subchamber 2 is not at a high temperature, so even if fuel is injected from the fuel injection nozzle 4 onto the plate 6 and collided with it, The injected fuel cannot take vaporization heat from the wall surface, so current is supplied to the conductor of the heating element 21 in response to a command from the controller 20 (step 35). The heating element 21 supplied with electric current is heated by the electric power, and the plate 6 becomes high in temperature.Therefore, the fuel injected from the fuel injection nozzle 4 is heated by the electric power. collide,
Ignition combustion can be promoted by the cough plate body 6, and HC
2. Generation of unburned gas, etc. can be prevented.

Further, the engine load is set to a predetermined engine load I-to.
If it is larger, the engine is at high speed and high load;
After determining that combustion is actively occurring, the temperature sensor 24 detects the wall temperature T, and the controller 20 sets the wall temperature T to a predetermined pre-calculated wall temperature T. A comparison is made to determine whether or not the value is larger than that (step 33).

The wall of the auxiliary chamber 2 or the plate body 6: 4T is a predetermined wall temperature T. If it is smaller, the plate 6 is at a low temperature and not at a high temperature, so even if the fuel is injected from the fuel injection nozzle 4 and collides with the plate 6, the injected fuel will not absorb vaporization heat from the wall surface. Can not. Therefore, current is supplied to the conductor of the heating element 21 according to a command from the controller 20 (step 35).
). The heating element 21 supplied with electric current is heated by the electric power, and the plate 6 becomes high in temperature.Therefore, the fuel injected from the fuel injection nozzle 4 is heated by the electric power. Upon collision, ignition and combustion can be promoted by the cough plate body 6, and generation of unburned HC1 gas and the like can be prevented.

Also, the wall temperature T of the subchamber 2 or the plate 6 is a predetermined wall temperature. If it is larger, the subchamber 2 is at a high temperature, combustion is actively occurring, and the plate body 6 is at a high temperature. Therefore, even if the heating element 21 is not turned on and heated, the injected fuel is well promoted to vaporize and is in a state where it can be ignited and combusted well. Stop the supplied Ti flow, that is, turn off the heating element 21 (Step 34)
There, the fuel injected from the fuel injection nozzle 4 collides with the plate 6 heated by the combustion gas, takes heat from the plate 6, and the fuel takes away sufficient heat of vaporization, forming a circular film. The diffused liquid fuel generates a good mixture with the intake air, promotes ignition furnace firing, prevents the generation of unburned gas such as HC1 intermediate raw material, improves startability, and improves engine efficiency.

〔Effect of the invention〕

The pre-chamber type diesel engine according to the present invention is also constructed as described above, and has the following effects. That is, this auxiliary chamber type diesel engine includes a auxiliary chamber arranged in the cylinder head, a communication hole that communicates the auxiliary chamber with the main chamber, a fuel injection nozzle that injects fuel onto the central axis of the auxiliary chamber, and the fuel injection nozzle. i'ii arranged in the sub-chamber substantially perpendicular to the fuel injection direction to cause the fuel injected from the nozzle to collide with the fuel injected from the nozzle;
Since it has a fixed plate and a heating element provided on the plate,
The fuel injected at low pressure from the salt injection nozzle collides with the plate and is uniformly spread as a disc-shaped film along the flat surface of the plate. At this time, if the plate is at a low temperature due to partial load, etc., the plate is heated by the heating element, so the plate is immediately raised and maintained at a high temperature, and the jets collide with the plate. The fuel sufficiently absorbs the heat of vaporization and becomes a disc-shaped film and is uniformly diffused, so that the disc shape is aligned with the flow direction of the air that flows from the main chamber through the communication hole into the auxiliary chamber without creating a swirl. The direction of the fuel injection is perpendicular to the fuel injection direction of the fuel film that is diffused and injected, promoting mixing and allowing immediate ignition and combustion, resulting in good combustion and unburned fuel or intermediate products. can be prevented from being emitted.

That is, when the engine is operating at low speed and under low load, the plate is at a low temperature, but the heating element is turned on and the plate is heated, so that the liquid injected fuel that collides with the plate is sufficient. In addition, since the combustion chamber of this diesel engine is of the pre-chamber type, when it is burned in the pre-chamber as described above, it is burnt as a rich fuel.
By blowing out the flame from the auxiliary chamber to the main chamber, the fuel equivalence ratio and combustion temperature are lowered, so the generation of NO8 can be further suppressed. can.

Specifically, the fuel becomes more dilute toward the outer periphery of the disc-shaped fuel film, and the fuel mixes with air faster toward the outer periphery. Moreover, the fuel located on the outer periphery of the circular fuel film has an earlier injection timing, and a longer activation time and vaporization time. Then, the fuel film is combusted from the outer periphery toward the center, and the fuel is in a good combustion state in the auxiliary chamber, and the main combustion occurs in the auxiliary chamber.

Further, in this pre-chamber type diesel engine, the plate body is disposed substantially perpendicular to an axis connecting the nozzle of the fuel injection nozzle and the communication hole, and the plate body is fixed to a wall body of the pre-chamber. In addition, since it is supported by a plater (y) equipped with fluid holes, the injected fuel injected into the plate can be spread in a preferred circular film shape. Furthermore, the plate body can be reliably placed in the sub-chamber with the bracket,
Moreover, since the bracket covers the large fluid passage, the bracket does not obstruct the flow of fluid, and air is introduced from the main chamber into the sub-chamber in a non-swirling manner. Additionally, the flame is smoothly blown out from the auxiliary chamber to the main chamber.

In addition, this pre-chamber type diesel engine has a sensor that detects the operating state of the engine, and a controller that controls turning on and off the heating element in response to a starting signal from the sensor, so that the engine is under partial load. When the temperature is low, such as when the heating element is heated, the ignition combustion of the fuel is reliably and quickly prevented, the generation of unburned gas can be suppressed, the startability can be improved, and the engine efficiency can be improved. That is, when the detected value of the operating state of the engine is a signal value higher than a predetermined set value, in other words, when the engine is running at high speed and under high load, the plate in the auxiliary chamber is at a high temperature, so that no current is applied to the heating element. The fuel vaporizes well and can be reliably ignited and combusted even if it is not heated by flowing the fuel, so the heating element is turned off and sufficient heat of vaporization is given to the injected fuel to generate a good air-fuel mixture and ignite. Allows for smooth combustion.

Furthermore, when the detected value of the operating state of the engine is a signal value lower than a predetermined set value, in other words, when the engine is at low speed and low load, the plate in the auxiliary chamber is not at a high temperature, so it responds to the operating state. Then, according to a command from a controller, a current is applied to the heating element to increase the plate body, and the injected fuel collides with the heated plate body, thereby assuring ignition combustion, and smoothly igniting the injected fuel. Burn, HC
This prevents the generation of unburned gas such as, and improves startability and engine efficiency.

Therefore, in the pre-chamber type diesel engine according to the present invention, the temperature of the plate in the pre-chamber is always maintained at an optimum temperature by on/off control of the heating element in the plate in the pre-chamber in the entire operating range. As a result, sufficient vaporization heat is given to the fuel injected from the fuel injection nozzle, vaporization is always promoted, a good air-fuel mixture is generated, ignition occurs reliably, and main combustion occurs in the pre-chamber. can be carried out, achieving good and smooth combustion,
The generation of unburned gas such as HC and NOx can be prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the pre-chamber type diesel engine according to the present invention, FIG. 2 is a plan view showing an example of a plate disposed in the pre-chamber shown in FIG. 1, and FIG. FIG. 2 is a process flow diagram showing an example of the operation of the pre-chamber diesel engine according to the present invention. 1------Main chamber, 2---Sub chamber, 3---Cylinder head, 4---Fuel injection nozzle, 5---One wall body, 6 plate body, 7- ------Brackenoto, 9----
One hole, 11 piston, 12---m-fluid port, 16
----One communication hole, 17- Nozzle, 20---Controller, 21 Silencer, 22---One load sensor, 23
---One rotation sensor, 24--One temperature sensor Fig. 2

Claims (3)

[Claims] (1) An auxiliary chamber arranged in the cylinder head, a communication hole that communicates the auxiliary chamber with the main chamber, a fuel injection nozzle that injects fuel in the direction of the communication hole on the central axis of the auxiliary chamber, and the fuel injection nozzle. A pre-chamber type diesel engine having a heat-resistant plate disposed in the pre-chamber for colliding fuel injected from the pre-chamber, and a heating element provided on the plate. (2) The plate body is arranged substantially perpendicular to an axis connecting the nozzle of the fuel injection nozzle and the communication hole, and the plate body is fixed to a wall body of the subchamber and is provided with a fluid port. The pre-chamber diesel engine according to claim 1, wherein the pre-chamber diesel engine is supported by a bracket. (3) A sensor that detects the operating state of the engine, and turns on the heating element in response to a detection signal from the sensor.
The pre-chamber type diesel engine according to claim 1, further comprising a controller that controls turning off.