JPH0138264Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an internal combustion engine that also serves as a compressor.

[Conventional technology]

Generally, internal combustion engines are provided with a compressor driven by the engine, and the compressed air from the compressor is used for appropriate purposes (for example, brake equipment).

[Problems that the idea is trying to solve]

By the way, in such an internal combustion engine, since the compressor is arranged separately and independently,
This method requires a space for installing the compressor, and has the drawback of increasing the number of parts and increasing costs.

Therefore, the Special Publication No. 56-10454 and the Utility Model Publication No. 1982-10454
Publication No. 177029 proposes an internal combustion engine that can also be used as a compressor to solve the above-mentioned drawbacks. Since the air tank is not equipped with a device that can automatically replenish compressed air when the air pressure is below the specified value, when used in a brake device, there is a risk that braking performance will deteriorate due to a lack of pressurized air.

The present invention was made in view of the above facts, and its purpose is to enable some cylinders among a plurality of cylinders to be used as a compressor without providing a separate compressor, and to obtain benefits. An air tank is provided to store compressed air, and when the pressure inside the air tank is below a predetermined value, some of the cylinders are switched to the compressor to automatically replenish the compressed air. It is about providing institutions.

[Means to solve the problem]

According to the present invention, there is provided a fuel cutoff valve disposed in a fuel supply channel for supplying fuel to some of the cylinders of an internal combustion engine body having a plurality of cylinders, and an exhaust channel of the some of the cylinders. an air tank connected by an air flow path branched on the upstream side of the exhaust flow path of the some of the cylinders from the position where the exhaust flow path is disposed; and the air flow path. The fuel cut-off valve and the exhaust on-off valve are closed by a flow passage on-off valve and a check valve disposed in the middle of the air tank, and an output signal from a pressure detection means that issues an output signal when the internal pressure of the air tank is below a predetermined value. A compressor-cum-compressor internal combustion engine is provided, which further comprises a control means for operating the flow passage opening/closing valve in an open state.

[Effect]

When the pressure of the compressed air in the air tank 42 falls below a predetermined pressure, the pressure detection means 50
Pressure switch S is closed (ON) due to the pressure signal from. When closed in this way, a signal generated in the control means 30 is transmitted to the fuel cutoff valve 2.
8, is supplied to the exhaust on-off valve 40 and the flow path on-off valve 48. When a signal is sent to the fuel cutoff valve 28, the fuel cutoff valve 28 is operated and closed, and the supply of fuel to the cylinder portion 6d is stopped.

When a signal is sent to the exhaust on-off valve 40, the exhaust on-off valve 40 is operated and closed, and the communication state of the exhaust flow path 38d is cut off. When the output is supplied to the flow path opening/closing valve 48, the exhaust flow path opening/closing valve 40 is activated and becomes open, and the air flow path 44 is brought into communication via the check valve 46.

Therefore, when the above outputs are respectively delivered, the cylinder 6d of the internal combustion engine main body 4 acts as a compressor, and the compressed air from the cylinder 6d passes through the check valve 46 of the air passage 44 to the air tank 42.
will be sent within.

When the air tank 42 is filled with compressed air and its pressure exceeds a predetermined pressure, the pressure detection means 50
Pressure switch S is opened (OFF) due to the pressure signal from. When opened in this manner, the fuel cut-off valve 28 becomes inoperative and becomes open, the exhaust on-off valve 40 becomes inactive and becomes open, and furthermore, the passage on-off valve 48 becomes inactive and becomes closed. The state will be as follows.

Therefore, when the pressure switch S is opened, the cylinder 6d acts as a combustion engine like the other cylinders 6a, 6b, and 6c, and the exhaust gas from the cylinder 6d passes through the exhaust flow path 38d and the main exhaust flow path 36 to the outside. is discharged.

〔Example〕

Hereinafter, a specific example of a compressor-cum-combustion engine constructed according to the present invention will be described with reference to the accompanying drawings.

In FIG. 1, which schematically illustrates a compressor-cum-compressor internal combustion engine, the internal combustion engine designated by the reference numeral 2 includes an internal combustion engine main body 4. As shown in FIG. The internal combustion engine main body 4 is formed with a plurality of cylinders, four cylinders 6a, 6b, 6c, and 6d in the illustrated example.

The cylinders 6a, 6b, 6c and 6d include
A fuel injection nozzle 8 is provided in each cylinder, and fuel supplied from a fuel supply system 10 is injected into the cylinders 6a, 6b, 6c, and 6d through the fuel injection nozzle 8, respectively.

The fuel supply system 10 includes a fuel tank 12 and a fuel injection pump 14, and the fuel injection pump 14 has plungers 18a, 18b, 18c and 1 corresponding to the plurality of cylinders 6a, 6b, 6c and 6d.
It is equipped with 8d.

A fuel flow path 16 is provided between the fuel tank 12 and the fuel injection pump 14, and the fuel injection pump 14
A fuel flow path 20 is provided between the fuel injection nozzle 8 and the fuel injection nozzle 8.
is installed.

The fuel passage 16 includes a main fuel supply passage 22 whose one end is connected to the fuel tank 12, a fuel supply passage 24a for supplying fuel from the main fuel supply passage 22 to the plunger 18a, and a main fuel supply passage. A fuel supply passage 24b for supplying fuel from 22 to the plunger 18b, and a fuel supply passage 2 for supplying fuel from the main fuel supply passage 22 to the plunger 18c.
4c and the main fuel supply flow path 22 to the plunger 18
It is composed of a fuel supply flow path 24d for supplying fuel to the fuel tank d.

Further, the fuel flow path 20 is connected to a fuel injection nozzle 8 disposed from the plunger 18a to the cylinder 6a.
A fuel supply passage 26a for supplying fuel to the fuel injection nozzle 8 disposed from the plunger 18b to the cylinder 6b, a fuel supply passage 26b for supplying fuel to the fuel injection nozzle 8 disposed from the plunger 18b to the cylinder 6c, The fuel supply passage 26c is configured to supply fuel to the fuel injection nozzle 8 disposed in the cylinder 6d, and the fuel supply passage 26d is configured to supply fuel from the plunger 18d to the fuel injection nozzle 8 disposed in the cylinder 6d. There is.

Therefore, in this specific example, the fuel supply channel 2
4a, 24b, 24c, 24d and fuel supply channel 2
Fuel supply passages for supplying fuel to 6a, 26b, 26c, and 26d are respectively configured.

The fuel supply system 10 is further provided with a fuel cutoff valve 28 as a fuel supply channel for supplying fuel to some of the cylinders, for example, in a fuel supply channel 24d that supplies fuel to the cylinder 6d. .

The fuel cutoff valve 28 is composed of a solenoid valve,
It is operated by an output from control means 30, which will be described later.

Note that this fuel cutoff valve 28 is connected to the fuel supply flow path 26d.
However, in such a case, the fuel from the plunger 18d can be placed in the fuel tank 1.
It is necessary to provide a return flow path for returning to No. 2.

Excess fuel within the fuel injection pump 14 is returned into the fuel tank 12 through the fuel return passage 32.

The exhaust gas in the plurality of cylinders 6a, 6b, 6c, and 6d described above is discharged to the outside through an exhaust discharge passage 34 constituted by an exhaust pipe. The exhaust exhaust flow path 34 is the main exhaust flow path 3 with one end open.
6. Main exhaust flow path 36, exhaust flow path 38a communicating with the inside of cylinder 6a, main exhaust flow path 36 and cylinder 6b
The main exhaust flow path 38c communicates with the inside of the cylinder 6c, and the exhaust flow path 38d communicates between the main exhaust flow path 36 and the inside of the cylinder 6d.

Therefore, in this specific example, the discharge channel 38
cylinder 6 by a, 38b, 38c, 38d
Discharge channels are configured at a, 6b, 6c, and 6d.

The exhaust gas discharge passage 34 is further provided with an exhaust opening/closing valve 40 in the middle of an exhaust passage 38d that communicates with the cylinder 6d as one of the cylinders.

The exhaust on/off valve 40 is composed of a solenoid valve,
It is operated by an output from control means 30, which will be described later. The exhaust flow path 38d is provided with an air flow path 44 that communicates with the air tank 42 on the upstream side of the exhaust valve 40, that is, on the engine side. This air flow path 44 includes a check valve 46 that is made up of a valve member and a spring member and that allows flow only to the air tank 42 side, and this check valve 46
A flow passage opening/closing valve 48 is disposed upstream from the disposed position, that is, on the engine side. The flow path opening/closing valve 48 is composed of a solenoid valve, and is operated by an output from a control means 30, which will be described later. The compressed air in the air tank 42 is used for appropriate purposes, such as a brake system.

The operation of the fuel cutoff valve 28, the exhaust on-off valve 40, and the flow path on-off valve 48 is controlled by the control means 30.

In FIG. 2 illustrating the control system, the control means 3
0 is equipped with a pressure switch S. This pressure switch S is activated by a pressure signal from a pressure detection means 50 that detects the pressure of compressed air in the air tank 42, and is closed (ON) when the pressure is below a predetermined pressure.

The fuel cutoff valve 28, exhaust on-off valve 40, and passage on-off valve 48 are each connected to a power source E via this pressure switch S.

Therefore, when the pressure switch S is closed, the fuel cutoff valve 28 is closed, the exhaust valve 40 is closed, and the flow path valve 48 is opened.

Next, the operation of the compressor/compressor internal combustion engine having the above-described configuration will be explained.

When the pressure of the compressed air in the air tank 42 falls below a predetermined pressure, the pressure detection means 50
Pressure switch S is closed (ON) due to the pressure signal from. When closed in this manner, a signal generated in the control means 30 is transmitted to the fuel cutoff valve 2.
8, is supplied to the exhaust on-off valve 40 and the flow path on-off valve 48. When a signal is sent to the fuel cutoff valve 28, the fuel cutoff valve 28 is operated and closed, and the supply of fuel to the cylinder portion 6d is stopped.

When a signal is sent to the exhaust on-off valve 40, the exhaust on-off valve 40 is operated and closed, and the communication state of the exhaust flow path 38d is cut off. When the output is supplied to the flow path opening/closing valve 48, the exhaust flow path opening/closing valve 40 is activated and becomes open, and the air flow path 44 is brought into communication via the check valve 46.

Therefore, when the above outputs are respectively delivered, the cylinder 6d of the internal combustion engine main body 4 acts as a compressor, and the compressed air from the cylinder 6d passes through the check valve 46 of the air passage 44 to the air tank 42.
will be sent within.

When the air tank 42 is filled with compressed air and its pressure exceeds a predetermined pressure, the pressure detection means 50
Pressure switch S is opened (OFF) due to the pressure signal from. When opened in this way, the fuel cutoff valve 28 becomes inoperable and becomes open, the exhaust on-off valve 40 becomes inoperable and becomes open, and furthermore, the passage on-off valve 48 becomes inoperable and becomes closed. The state will be as follows.

Therefore, when the pressure switch S is opened, the cylinder 6d acts as a combustion engine like the other cylinders 6a, 6b, and 6c, and the exhaust gas from the cylinder 6d passes through the exhaust flow path 38d and the main exhaust flow path 36 to the outside. is discharged.

At this time, that is, when the cylinder 6d acts as a fuel engine, high temperature exhaust gas flows through the flow path opening/closing valve 48.
Since the check valve 46 is shut off by the exhaust gas, the check valve 46 is prevented from being constantly exposed to exhaust gas, and thus the durability of the check valve 46 can be improved.

In the specific example described above, the pressure of the compressed air in the air tank 42 is detected to control the operation of the fuel cutoff valve 28, the exhaust opening/closing valve 40, and the flow path opening/closing valve 48, but the control system illustrated in FIG. It is also possible to control the operation by

In FIG. 3, a rotation speed signal from a rotation speed detection means 52 for detecting the rotation speed of the internal combustion engine 2 and a load signal from a load detection means 54 for detecting the load on the internal combustion engine 2 are respectively sent to the control means 30. Ru.

Further, the control means 30 sends operating signals generated due to the rotational speed signal and the load signal to the fuel cutoff valve 28, the exhaust on-off valve 40, and the flow path on-off valve 48.
will be sent to

In this modification, when the rotation speed of the internal combustion engine 2 is below a predetermined rotation speed and the load on the internal combustion engine 2 is low, the rotation speed signal from the rotation speed detection means 52 and the load from the load detection means 54 are an activation signal is generated in the control means 30 due to the signal;
This signal is sent to the fuel cutoff valve 28, the exhaust on-off valve 40, and the flow path on-off valve 48. When each of these signals is sent, the fuel cutoff valve 2 is activated as described above.
8 is in a closed state, the exhaust on-off valve 40 is in a closed state, and the flow path on-off valve 48 is in an open state.
d acts as a compressor, and thus compressed air from the cylinder 6d is fed into the air tank 42 via the check valve 46.

Although the compressor/compressor internal combustion engine constructed according to the present invention has been described above, the present invention is not limited to such specific examples, and various modifications and changes can be made without departing from the scope of the present invention. be.

Further, in the above specific example, the application is applied to a four-cylinder internal combustion engine, but the application is not limited to four cylinders, and can be applied to various multi-cylinder engines such as six cylinders and eight cylinders. Even in the case of a cylinder that operates as a cylinder, the number of cylinders is not limited to one.

[Effect of idea]

As described above, the compressor-cum-combustor internal combustion engine of the present invention includes a fuel cutoff valve disposed in a fuel supply passage for supplying fuel to some cylinders of an internal combustion engine body having a plurality of cylinders, and An exhaust on-off valve disposed in the exhaust flow path of some of the cylinders is connected by an air flow path branched on the upstream side of the exhaust flow path of the some cylinders from the position where the exhaust on-off valve is disposed. The fuel is shut off by an output signal from an air tank, a flow path opening/closing valve and a check valve disposed in the middle of the air flow path, and a pressure detection means that outputs an output signal when the internal pressure of the air tank is below a predetermined value. Since it is comprised of a valve and a control means for operating the exhaust opening/closing valve in a closed state and further operating the flow path opening/closing valve in an open state, compressed air from some of the cylinders can be stored in the air tank, and the air tank When the internal pressure is below a predetermined value, some of the cylinders can be switched to the compressor to automatically replenish compressed air, thereby providing a reliable compressor/compressor internal combustion engine.

[Brief explanation of the drawing]

FIG. 1 is a simplified system diagram showing the configuration of a compressor-combined internal combustion engine constructed according to the present invention; FIG. 2 is a schematic system diagram showing the control system of the compressor-combined internal combustion engine shown in FIG. 1; FIG. 3 is a schematic system diagram showing a modification of the control system. 4... Internal combustion engine main body, 6a, 6b, 6c and 6
d...Cylinder, 16...Fuel flow path, 24a, 2
4b, 24c, 24d...Fuel supply channel, 26
a, 26b, 26c, 26d... fuel supply flow path,
28...Fuel cutoff valve, 30...Control means, 34...
...Exhaust discharge channel, 38a, 38b, 38c, 38
d...Exhaust flow path, 40...Exhaust opening/closing valve, 42...
Air tank, 44...Air flow path, 46...Check valve, 48...Flow path opening/closing valve.

Claims (1)

[Scope of utility model registration request] A fuel cutoff valve disposed in a fuel supply passage for supplying fuel to some cylinders of an internal combustion engine body having a plurality of cylinders, and an exhaust disposed in an exhaust passage of said some cylinders. an on-off valve, an air tank connected by an air flow path branched upstream from a location of the exhaust on-off flow path of the exhaust flow path of some of the cylinders, and an air tank disposed in the middle of the air flow path; The closed state of the fuel cutoff valve and the exhaust on/off valve, and the closed state of the fuel cutoff valve and the exhaust on/off valve are determined based on the output signal of the flow path on/off valve and the check valve, and the pressure detection means that generates an output signal when the internal pressure of the air tank is below a predetermined value. An internal combustion engine that also serves as a compressor and includes a control means for opening a road opening/closing valve.