阅读说明：本技术 紧急停车系统及紧急停车方法 (Emergency stop system and emergency stop method ) 是由 宋杨 季永会 王志磊 郭亚琼 于 2021-08-18 设计创作，主要内容包括：本发明提供了一种紧急停车系统及紧急停车方法,解决了紧急情况下,柴油机无法立刻停止工作的问题。该紧急停车系统包括与油箱连接的第一管路、与燃油喷射系统连接第二管路、连接管路和油泵,第一管路、第二管路和连接管路相连通,油泵位于连接管路上；当处于正常工况时,连接管路的入口与第一管路连通,其出口与第二管路连通,油泵工作时能使流体经连接管路进入至第二管路；当处于紧急停车工况时,连接管路的入口与第二管路连通,其出口与第一管路连通,油泵工作时能使燃油将连接管路进入至第一管路。上述油泵的惯性运转使系统中的残留燃油依次经连接管路出口、第一管路被吸入至油箱中,减少残留燃油,防止燃油系统继续工作,达到快速停车的效果。(The invention provides an emergency stop system and an emergency stop method, which solve the problem that a diesel engine cannot stop working immediately in an emergency. The emergency stop system comprises a first pipeline connected with an oil tank, a second pipeline connected with a fuel injection system, a connecting pipeline and an oil pump, wherein the first pipeline, the second pipeline and the connecting pipeline are communicated, and the oil pump is positioned on the connecting pipeline; when the oil pump works, fluid can enter the second pipeline through the connecting pipeline; when the emergency stop working condition is met, the inlet of the connecting pipeline is communicated with the second pipeline, the outlet of the connecting pipeline is communicated with the first pipeline, and fuel oil can enter the connecting pipeline into the first pipeline when the oil pump works. The inertial operation of the oil pump enables residual fuel oil in the system to be sucked into the oil tank through the connecting pipeline outlet and the first pipeline in sequence, so that the residual fuel oil is reduced, the fuel oil system is prevented from continuing to work, and the effect of rapid parking is achieved.)

1. An emergency shutdown system, comprising a first pipeline connected to a fuel tank, a second pipeline connected to a fuel injection system, a connecting pipeline, and an oil pump, wherein:

the first pipeline, the second pipeline and the connecting pipeline are communicated, and the oil pump is positioned on the connecting pipeline;

when the oil pump works, fluid can enter the second pipeline through the connecting pipeline;

when the emergency stop working condition is met, the inlet of the connecting pipeline is communicated with the second pipeline, the outlet of the connecting pipeline is communicated with the first pipeline, and fuel oil can enter the connecting pipeline into the first pipeline when the oil pump works.

2. The emergency shutdown system of claim 1, further comprising a switching valve communicating the first line, the connecting line, and the connecting line;

when the switching valve is in a normal working condition, the inlet of the connecting pipeline is communicated with the first pipeline through the switching valve, and the outlet of the connecting pipeline is communicated with the second pipeline;

when the emergency stop working condition is met, the switching valve is switched to communicate the inlet of the connecting pipeline with the second pipeline and communicate the outlet of the connecting pipeline with the first pipeline.

3. The emergency parking system of claim 1 further comprising a two-position, five-way valve, wherein a branch port is present on the connecting line, the branch port being located downstream of the oil pump, wherein:

when the two-position five-way valve is in a normal working condition, a solenoid valve on a first working position of the two-position five-way valve is electrified, the first pipeline is used as an oil inlet pipe and communicated with a port B of the first working position, the second pipeline is used as an oil outlet pipe and communicated with a port A of the first working position, an inlet of the connecting pipeline is communicated with a port P of the first working position, an outlet of the connecting pipeline is communicated with a port R of the first working position, and the branch pipe orifice is connected with the port S of the first working position; in the first working position of the two-position five-way valve, the interface A is communicated with the interface R, the interface B is communicated with the interface P, and the interface S is blocked;

when the two-position five-way valve is in an emergency stop state, a solenoid valve on a second working position of the two-position five-way valve is electrified, the second pipeline is used as an oil inlet pipe and communicated with an A ' interface of the second working position, the first pipeline is used as an oil outlet pipe and communicated with a B ' interface of the second working position, an inlet of the connecting pipeline is communicated with a P ' interface of the second working position, the branch pipe orifice is communicated with an S ' interface of the second working position, and an outlet of the connecting pipeline is communicated with an R ' interface of the second working position; and in a second working position of the two-position five-way valve, the A ' interface is communicated with the P ' interface, the B ' interface is communicated with the S ' interface, and the R ' interface is blocked.

4. The emergency parking system of claim 3 wherein there is a one-way valve on the connecting line that allows only fluid flowing through the oil pump to flow to the two-position, five-way valve.

5. Emergency stop system according to any of claims 1-3, further comprising an exhaust line connected in parallel with the oil pump for exhausting residual gases from the system.

6. The emergency shutdown system of claim 5, wherein a manual supply pump and a one-way purge valve are present on the exhaust line, the one-way purge valve being located downstream of the manual supply pump, the manual supply pump being operable to allow gas in the system to be vented through the one-way purge valve.

7. The emergency shutdown system of claim 6, wherein a fuel chamber is also present on the vent line between the manual supply pump and the one-way purge valve for collecting residual fuel in the system.

8. The emergency parking system of claim 3 further comprising a control unit electrically connected to the two-position five-way valve, wherein the control unit is configured to control the solenoid valve in the first operating position or the solenoid valve in the second operating position of the two-position five-way valve to be energized.

9. An emergency stop method based on the emergency stop system according to any one of claims 1 to 8, comprising the steps of:

when the fuel injection system is in a normal working condition, the inlet of the connecting pipeline is communicated with the first pipeline, the outlet of the connecting pipeline is communicated with the second pipeline, and the oil pump works to enable fluid to enter the second pipeline through the connecting pipeline and be sprayed out by the fuel injection system;

when the emergency stop working condition is met, the inlet of the connecting pipeline is communicated with the second pipeline, the outlet of the connecting pipeline is communicated with the first pipeline, and the oil pump works to enable fuel oil to enter the first pipeline through the connecting pipeline and flow back to the oil tank.

10. The emergency parking method of claim 9 further comprising a two-position, five-way valve, wherein a branch port is present on the connecting line, the branch port being located downstream of the oil pump, wherein:

when the two-position five-way valve is in a normal working condition, the electromagnetic valve on the first working position of the two-position five-way valve is electrified, so that the interface A on the first working position is communicated with the interface R, the interface B on the first working position is communicated with the interface P, and the interface S is blocked; the first pipeline is used as an oil inlet pipe and communicated with a port B of the first working position, the second pipeline is used as an oil outlet pipe and communicated with a port A of the first working position, an inlet of the connecting pipeline is communicated with a port P of the first working position, an outlet of the connecting pipeline is communicated with a port R of the first working position, and a branch pipe orifice is connected with a port S of the first working position;

when the two-position five-way valve is in an emergency stop state, the electromagnetic valve on the second working position of the two-position five-way valve is electrified, so that the interface A ' is communicated with the interface P ', the interface B ' is communicated with the interface S ', and the interface R ' is blocked; at the moment, the second pipeline is used as an oil inlet pipe and communicated with the A ' interface of the second working position, the first pipeline is used as an oil outlet pipe and communicated with the B ' interface of the second working position, the inlet of the connecting pipeline is communicated with the P ' interface of the second working position, the branch pipe orifice is communicated with the S ' interface of the second working position, and the outlet of the connecting pipeline is communicated with the R ' interface of the second working position.

Technical Field

The invention relates to the technical field of diesel engines, in particular to an emergency stop system and an emergency stop method.

Background

The rotating speed of the diesel engine exceeds the specified rotating speed, the diesel engine is likely to have a runaway fault, the combustion of the diesel engine is out of control, the vibration intensity is greatly increased, the power far exceeds the design index, the diesel engine is likely to have a shaft holding or cylinder pulling fault, the diesel engine is likely to be damaged, and the health of operators is likely to be damaged. Therefore, when the rotating speed of the diesel engine exceeds a rated value, the diesel engine receives a stop command and needs to be decelerated immediately.

The emergency stop method in the prior art is roughly two methods:

1. the air inlet pipe is closed, so that the air inlet amount is reduced, the combustion is stopped due to oxygen deficiency,

2. the fuel inlet pipe is closed urgently, and combustion is stopped by stopping fuel supply.

The applicant has found that the prior art has at least the following technical problems: in the first method, the air inlet pipe and the cylinder cover store certain air, so that the combustion lasts for a period of time, and the rotating speed of the diesel engine cannot be reduced quickly; in the second method, since the oil pump, the fuel pipe, the fuel injection nozzle, and the like have a certain amount of oil, the combustion process does not stop immediately, and the diesel engine continues to operate.

Disclosure of Invention

The invention aims to provide an emergency stop system and an emergency stop method, which aim to solve the technical problem that the residual air or fuel in the system can not stop the operation of a diesel engine immediately under the emergency condition in the prior art; the technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides an emergency stop system, which comprises a first pipeline connected with an oil tank, a second pipeline connected with a fuel injection system, a connecting pipeline and an oil pump, wherein:

the first pipeline, the second pipeline and the connecting pipeline are communicated, and the oil pump is positioned on the connecting pipeline;

when the oil pump works, fluid can enter the second pipeline through the connecting pipeline;

when the emergency stop working condition is met, the inlet of the connecting pipeline is communicated with the second pipeline, the outlet of the connecting pipeline is communicated with the first pipeline, and fuel oil can enter the connecting pipeline into the first pipeline when the oil pump works.

Preferably, the emergency stop system further includes a switching valve communicating the first pipe, the connection pipe, and the connection pipe;

when the switching valve is in a normal working condition, the inlet of the connecting pipeline is communicated with the first pipeline through the switching valve, and the outlet of the connecting pipeline is communicated with the second pipeline;

when the emergency stop working condition is met, the switching valve is switched to communicate the inlet of the connecting pipeline with the second pipeline and communicate the outlet of the connecting pipeline with the first pipeline.

Preferably, the emergency stop system further comprises a two-position five-way valve, a branch pipe port is arranged on the connecting pipeline, and the branch pipe port is located downstream of the oil pump, wherein:

when the two-position five-way valve is in a normal working condition, a solenoid valve on a first working position of the two-position five-way valve is electrified, the first pipeline is used as an oil inlet pipe and communicated with a port B of the first working position, the second pipeline is used as an oil outlet pipe and communicated with a port A of the first working position, an inlet of the connecting pipeline is communicated with a port P of the first working position, an outlet of the connecting pipeline is communicated with a port R of the first working position, and the branch pipe orifice is connected with the port S of the first working position; in the first working position of the two-position five-way valve, the interface A is communicated with the interface R, the interface B is communicated with the interface P, and the interface S is blocked;

when the two-position five-way valve is in an emergency stop state, a solenoid valve on a second working position of the two-position five-way valve is electrified, the second pipeline is used as an oil inlet pipe and communicated with an A ' interface of the second working position, the first pipeline is used as an oil outlet pipe and communicated with a B ' interface of the second working position, an inlet of the connecting pipeline is communicated with a P ' interface of the second working position, the branch pipe orifice is communicated with an S ' interface of the second working position, and an outlet of the connecting pipeline is communicated with an R ' interface of the second working position; and in a second working position of the two-position five-way valve, the A ' interface is communicated with the P ' interface, the B ' interface is communicated with the S ' interface, and the R ' interface is blocked.

Preferably, a check valve is arranged on the connecting pipeline, and the check valve only allows fluid flowing through the oil pump to flow to the two-position five-way valve.

Preferably, the emergency stop system further comprises an exhaust pipeline, and the exhaust pipeline is connected with the oil pump in parallel and used for exhausting residual gas in the system.

Preferably, a manual supply pump and a one-way air release valve are arranged on the exhaust pipeline, the one-way air release valve is positioned at the downstream of the manual supply pump, and when the manual supply pump works, gas in the system can be released through the one-way air release valve.

Preferably, a fuel cavity is further arranged on the exhaust pipeline, and the fuel cavity is located between the manual supply pump and the one-way air release valve and used for collecting residual fuel in the system.

Preferably, the emergency stop system further comprises a control unit, the control unit is electrically connected with the two-position five-way valve, and the control unit is used for controlling the electromagnetic valve on the first working position or the electromagnetic valve on the second working position of the two-position five-way valve to be electrified.

The invention also provides an emergency stop method based on the emergency stop system, which comprises the following steps:

when the fuel injection system is in a normal working condition, the inlet of the connecting pipeline is communicated with the first pipeline, the outlet of the connecting pipeline is communicated with the second pipeline, and the oil pump works to enable fluid to enter the second pipeline through the connecting pipeline and be sprayed out by the fuel injection system;

when the emergency stop working condition is met, the inlet of the connecting pipeline is communicated with the second pipeline, the outlet of the connecting pipeline is communicated with the first pipeline, and the oil pump works to enable fuel oil to enter the first pipeline through the connecting pipeline and flow back to the oil tank.

Preferably, the emergency stop system further comprises a two-position five-way valve, a branch pipe port is arranged on the connecting pipeline, and the branch pipe port is located downstream of the oil pump, wherein:

when the two-position five-way valve is in a normal working condition, the electromagnetic valve on the first working position of the two-position five-way valve is electrified, so that the interface A on the first working position is communicated with the interface R, the interface B on the first working position is communicated with the interface P, and the interface S is blocked; the first pipeline is used as an oil inlet pipe and communicated with a port B of the first working position, the second pipeline is used as an oil outlet pipe and communicated with a port A of the first working position, an inlet of the connecting pipeline is communicated with a port P of the first working position, an outlet of the connecting pipeline is communicated with a port R of the first working position, and a branch pipe orifice is connected with a port S of the first working position;

when the two-position five-way valve is in an emergency stop state, the electromagnetic valve on the second working position of the two-position five-way valve is electrified, so that the interface A ' is communicated with the interface P ', the interface B ' is communicated with the interface S ', and the interface R ' is blocked; at the moment, the second pipeline is used as an oil inlet pipe and communicated with the A ' interface of the second working position, the first pipeline is used as an oil outlet pipe and communicated with the B ' interface of the second working position, the inlet of the connecting pipeline is communicated with the P ' interface of the second working position, the branch pipe orifice is communicated with the S ' interface of the second working position, and the outlet of the connecting pipeline is communicated with the R ' interface of the second working position.

Compared with the prior art, the emergency stop system and the emergency stop method provided by the invention have the following beneficial effects: under the normal working condition, the inlet of the connecting pipeline is communicated with the first pipeline, the outlet of the connecting pipeline is communicated with the second pipeline, and fuel in the fuel tank enters a fuel injection system under the pressure driving by using an oil pump in the connecting pipeline; when the emergency stop is carried out, certain gas or oil is remained in the system, the oil pump cannot stop running instantly due to inertia, the inlet of the connecting pipeline is switched to be communicated with the second pipeline, the outlet of the connecting pipeline is communicated with the first pipeline, and the inertial running of the oil pump enables the residual fuel oil in the system to be sucked into the oil tank through the outlet of the connecting pipeline and the first pipeline in sequence, so that the residual fuel oil is reduced, the fuel oil system is prevented from working continuously, and the effect of rapid stop is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the emergency stop system of the present invention under normal operating conditions;

FIG. 2 is a schematic structural diagram of the emergency stop system of the present invention under an emergency stop condition;

FIG. 3 is a schematic fuel flow diagram of the emergency stop system under normal operating conditions;

fig. 4 is a schematic fuel flow diagram of the emergency stop system during an emergency stop condition.

FIG. 1 shows a first pipeline; 2. a second pipeline; 3. an oil pump; 4. a two-position five-way valve; 5. connecting a pipeline; 6. an exhaust line; 7. a manual supply pump; 8. a one-way exhaust valve; 9. a fuel oil chamber; 10. a one-way valve; 11. a branch pipe orifice; 12. and (4) a joint.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the equipment or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The embodiment of the invention provides an emergency stop system and an emergency stop method, which can suck residual fuel in the system into an oil tank, prevent the fuel system from continuously working and achieve the effect of quickly stopping.

The technical solution provided by the present invention is explained in more detail below with reference to fig. 1 to 4.

Example one

As shown in fig. 1-4, wherein the direction of the arrows in fig. 3 and 4 indicate the direction of flow of the fuel; the embodiment provides an emergency stop system, which comprises a first pipeline 1 connected with an oil tank, a second pipeline 2 connected with a fuel injection system, a connecting pipeline 5 and an oil pump 3, wherein the first pipeline 1, the second pipeline 2 and the connecting pipeline 5 are communicated, and the oil pump 3 is positioned on the connecting pipeline 5; when the oil pump 3 works, fluid can enter the second pipeline 2 through the connecting pipeline 5; in the process, the first pipeline 1 is used as an oil inlet pipe, the second pipeline 2 is used as an oil outlet pipe, and the oil pump 3 is operated to pressurize fuel oil in a fuel oil tank to a fuel oil injection system for spraying.

When the emergency stop working condition is met, the inlet of the connecting pipeline 5 is communicated with the second pipeline 2, the outlet of the connecting pipeline is communicated with the first pipeline 1, and the oil pump 3 can enable fuel oil to enter the connecting pipeline 5 into the first pipeline 1 when working. In the process, the second pipeline 2 is used as an oil inlet pipe, the first pipeline 1 is used as an oil outlet pipe, and the fuel in the system flows back to a fuel tank through the inertia running after the oil pump 3 is stopped.

Compared with the prior art, the emergency stop system of the embodiment has the following beneficial effects: under the normal working condition, the inlet of the connecting pipeline 5 is communicated with the first pipeline 1, the outlet of the connecting pipeline is communicated with the second pipeline 2, and fuel in the fuel tank enters a fuel injection system under the pressure driving by utilizing the oil pump 3 in the connecting pipeline 5; because certain gas or oil remains in the system during emergency stop, and the oil pump 3 cannot stop running instantly due to inertia, the inlet of the connecting pipeline 5 is switched to be communicated with the second pipeline 2, the outlet of the connecting pipeline 5 is communicated with the first pipeline 1, and the inertial running of the oil pump 3 enables the residual fuel oil in the system to be sucked into the oil tank through the outlet of the connecting pipeline 5 and the first pipeline 1 in sequence, so that the residual fuel oil is reduced, the fuel oil system is prevented from working continuously, and the effect of rapid stop is achieved.

Wherein, it should be understood that, under normal working conditions, the oil pump 3 operates, so that the fuel in the oil tank enters the fuel injection system through the connecting pipeline 5 and the second pipeline 2 in sequence through the inlet of the connecting pipeline 5 and is sprayed out; in the emergency stop state, the oil pump 3 continues to operate due to inertia after receiving a stop command, and at the moment, the oil pump 3 rotates due to inertia, so that residual fuel in the connecting pipeline 5 enters the first pipeline 1 through an outlet of the connecting pipeline 5 and is sucked into the oil tank. In an emergency stop state, the inertial running of the oil pump 3 and the switching of the pipelines are utilized to realize the return of the residual fuel into the liposuction oil tank.

As an optional implementation manner, the emergency stop system in this embodiment further includes a switching valve, the switching valve communicates the first pipeline 1, the connecting pipeline 5 and the connecting pipeline 5; when the valve is in a normal working condition, the inlet of the connecting pipeline 5 is communicated with the first pipeline 1 through the change-over valve, and the outlet of the connecting pipeline 5 is communicated with the second pipeline 2; at this time, the first pipeline 1 is used as an oil inlet pipe, the second pipeline 2 is used as an oil outlet pipe, and fluid flowing through the change-over valve can enter the second pipeline 2 through the connecting pipeline 5 and the change-over valve in sequence; when in the emergency stop condition, the change-over valve is switched to communicate the inlet of the connecting pipeline 5 with the second pipeline 2 and communicate the outlet of the connecting pipeline 5 with the first pipeline 1. At this time, the change-over valve switches the first pipeline 1 to the oil outlet pipe and switches the second pipeline 2 to the oil inlet pipe, and the fuel can sequentially enter the first pipeline 1 and the fuel tank through the connecting pipeline 5 and the change-over valve.

The function of the above-mentioned changeover valve is to selectively communicate the inlet of the connecting line 5 with the first line 1 or the second line 2 and selectively communicate the outlet of the connecting line 5 with the second line 2 or the first line 1.

In the present embodiment, a specific implementation of the switch valve is provided, and as shown in fig. 1 to fig. 4, the emergency parking system further includes a two-position five-way valve 4, that is, the switch valve of the present embodiment includes the two-position five-way valve 4, a branch port 11 exists on the connecting pipeline 5, and the branch port 11 is located downstream of the oil pump 3, where: when the two-position five-way valve is in a normal working condition, the electromagnetic valve on the first working position of the two-position five-way valve 4 is electrified, the first pipeline 1 is used as an oil inlet pipe and communicated with the interface B of the first working position, the second pipeline 2 is used as an oil outlet pipe and communicated with the interface A of the first working position, the inlet of the connecting pipeline 5 is communicated with the interface P of the first working position, the outlet of the connecting pipeline 5 is communicated with the interface R of the first working position, and the branch pipe port 11 is connected with the interface S of the first working position; in the first working position of the two-position five-way valve 4, the interface A is communicated with the interface R, the interface B is communicated with the interface P, and the interface S is blocked;

when the emergency stop state is in, the electromagnetic valve on the second working position of the two-position five-way valve 4 is electrified, the second pipeline 2 is used as an oil inlet pipe and communicated with an A ' interface of the second working position, the first pipeline 1 is used as an oil outlet pipe and communicated with a B ' interface of the second working position, an inlet of the connecting pipeline 5 is communicated with a P ' interface of the second working position, the branch pipe port 11 is communicated with an S ' interface of the second working position, and an outlet of the connecting pipeline 5 is communicated with an R ' interface of the second working position; in the second working position of the two-position five-way valve 4, the A ' interface is communicated with the P ' interface, the B ' interface is communicated with the S ' interface, and the R ' interface is blocked.

The two-position five-way valve 4 is mature in the field of the prior art, and the two-position means two working positions of the valve core of the electromagnetic valve, namely a first working position and a second working position; "five-way" means that the solenoid valve has five air pipe interfaces (in the prior art, the five interfaces are usually named by A, B, R, P, S differentiation). The working principle of the two-position five-way valve 4 is as follows: the electromagnetic valve is internally provided with a closed cavity, through holes are formed in different positions, each hole is communicated with different oil pipes, a valve is arranged in the middle of the cavity, electromagnets are arranged on two sides of the cavity, when a left magnet coil is electrified, the valve body is attracted to the left side, and the first working position works; when the right side magnet coil is electrified, the valve body can attract the right side, and the second working position works. The movement of the valve body is controlled to block or leak different oil drainage holes. Because the oil inlet hole is normally opened, hydraulic oil can enter different oil discharge pipes, then the piston of the oil cylinder is pushed by the pressure of the oil, the piston drives the piston rod, and the piston rod drives the mechanical device to move. Therefore, the mechanical motion is controlled by controlling the current of the electromagnet, and the communication of different interfaces is realized.

Referring to fig. 3, under a normal working condition, the left side magnet coil of the two-position five-way valve 4 is energized (left side in the figure), the first working position works (left side working position), the interface a is communicated with the interface R, the interface B is communicated with the interface P, and the interface S is blocked; referring to the arrow direction, under the action of the oil pump 3, the fuel oil sequentially passes through the first pipeline 1, the two-position five-way valve 4, the connecting pipeline 5, the two-position five-way valve 4 and the second pipeline 2 and then enters the fuel oil injection system; referring to fig. 4, under the emergency stop condition, the right side magnet coil (right side in the figure) of the two-position five-way valve 4 is powered on, the second working position works (right side working position), the interface a ' is communicated with the interface P ', the interface B ' is communicated with the interface S ', and the interface R ' is blocked; referring to the arrow direction, the inertial operation of the oil pump 3 enables the fuel in the connecting pipeline 5 to enter the oil tank through the two-position five-way valve 4 and the first pipeline 1, so that the fuel in the system is reduced, and the system is prevented from continuously working.

As an alternative embodiment, referring to fig. 1-4, a check valve 10 is arranged on the connecting line 5, and the check valve 10 only allows the fluid flowing through the oil pump 3 to flow to the two-position five-way valve 4, so as to prevent the fuel from flowing backwards.

After the emergency stop of the diesel engine, the operation of the diesel engine is affected due to the presence of gas and/or residual fuel in the system.

In view of this problem, as shown in fig. 1 to 4, the emergency shutdown system further includes an exhaust line 6, and the exhaust line 6 is connected in parallel with the oil pump 3 for exhausting residual gas in the system.

The exhaust line 6 enables the gases in the system to be exhausted after an emergency stop, preventing the gases in the system from affecting the subsequent operation of the diesel engine.

Specifically, referring to fig. 1-4, a manual supply pump 7 and a one-way vent valve are arranged on the vent pipeline 6, the one-way vent valve is located at the downstream of the manual supply pump 7, and when the manual supply pump 7 works, gas in the system can be exhausted through the one-way vent valve. The manual feed pump 7 is well known in the art and its construction will not be described in detail. The manual supply pump 7 is manually used, the pump body works, air is conveniently discharged through the one-way exhaust valve 8, and the use is convenient.

In an alternative embodiment, a fuel chamber 9 is also present on the vent line 6, the fuel chamber 9 being located between the manual feed pump 7 and the one-way purge valve for collecting residual fuel in the system.

Because residual fuel oil possibly exists after the system is in emergency stop, the fuel oil pump 3 and the manual fuel oil supply pump are connected in parallel, the fuel oil cavity 9 is placed at the highest position of the fuel oil system, oil gas is conveniently discharged, the one-way vent valve of the fuel oil cavity 9 can be opened, fuel oil is extruded by the manual fuel oil supply pump, when part of the fuel oil flows out of the one-way vent valve, the oil gas is indicated to be discharged from the system, and finally the one-way vent valve is closed.

As an optional implementation manner, the emergency stop system further includes a control unit (ECU), the control unit (ECU) is electrically connected to the two-position five-way valve 4, and the control unit (ECU) is configured to control the energization of the electromagnetic valve in the first working position or the electromagnetic valve in the second working position of the two-position five-way valve 4.

In the embodiment, the electrifying states of two sides of the two-position five-way valve 4 are controlled according to the instruction of the ECU, the two-position five-way valve 4 is equivalent to a switching value, quick response can be realized, other fuel pipelines do not need to move, and the reliability of the system is ensured.

The emergency stop system of the embodiment sends an instruction to the two-position five-way valve 4 according to the ECU instruction and the engine running condition, and the operation process is as follows:

a. when the diesel engine is in a normal working condition, the working mode is as follows:

referring to fig. 3, the two-position five-way valve 4 is in the positive communication mode, fuel enters the first pipeline 1 (the first pipeline 1 serves as an oil inlet pipe), then enters the interface B of the two-position five-way valve 4, then passes through the two-position five-way valve 4, flows out from the interface P of the two-position five-way valve 4, enters the connecting pipeline 5, enters the onboard oil pump 3, flows in the connecting pipeline 5 through the check valve 10, then flows into the interface R of the two-position five-way valve 4, flows into the second pipeline 2 (the second pipeline 2 serves as an oil outlet pipe) from the interface a of the two-position five-way valve 4, and finally enters the fuel injection system.

b. When the diesel engine is in the emergency stop working condition, the working mode is as follows:

referring to fig. 4, the two-position five-way valve 4 is in an oblique communication mode, and in the case of emergency stop, under the action of inertial force, the oil pump 3 continues to rotate, and fuel oil is sucked out from the fuel oil injection system, enters the interface a ' of the two-position five-way valve 4, flows out from the interface P ' of the two-position five-way valve 4, enters the inlet of the oil pump 3 through the connecting pipeline 5, enters the interface S ' of the two-position five-way valve 4 through the check valve 10, flows into the first pipeline 1 (the first pipeline 1 serves as an oil outlet pipe) from the interface B of the two-position five-way valve 4, and finally enters the oil tank. To prevent leakage of a section of the connecting line 5, it is sealed using a two-position, five-way valve 4 and a fitting 12.

c. When the engine is started after emergency stop, the working modes of the engine are as follows:

the two-position five-way valve 4 is in a positive communication mode, after emergency stop, the oil pump 3 sucks out fuel oil of a fuel oil system, oil mist gas possibly exists in the fuel oil system due to vacuum pumping, oil gas in the system needs to be removed, firstly, the one-way air release valve is opened, then, the manual fuel oil supply pump is repeatedly squeezed, the fuel oil is extracted to enter the fuel oil cavity 9, when the one-way air release valve flows out of the fuel oil cavity 9, the fact that the oil gas is basically removed from the system is shown, and finally, the one-way air release valve is closed.

Example two

The embodiment provides an emergency stop method based on the emergency stop system, which comprises the following steps:

when the fuel injection system is in a normal working condition, the inlet of the connecting pipeline 5 is communicated with the first pipeline 1, the outlet of the connecting pipeline is communicated with the second pipeline 2, and the oil pump 3 works to enable fluid to enter the second pipeline 2 through the connecting pipeline 5 and be sprayed out by the fuel injection system;

when the emergency stop working condition is met, the inlet of the connecting pipeline 5 is communicated with the second pipeline 2, the outlet of the connecting pipeline is communicated with the first pipeline 1, and the oil pump 3 works to enable fuel oil to enter the first pipeline 1 through the connecting pipeline 5 and flow back to the oil tank.

The conventional method is to stop the vehicle in an emergency manner by cutting off the gas or oil, but the diesel engine still continues to work for a certain time due to the fact that certain gas or oil is remained in the system, so that the diesel engine cannot brake immediately, and unpredictable faults can be caused.

According to the emergency stop method, fuel of the fuel system is sucked, residual fuel is reduced, the fuel system is prevented from continuously working, and the effect of quickly stopping the vehicle is achieved.

As an alternative embodiment, the emergency stop system further comprises a two-position five-way valve 4, a branch port 11 is present on the connecting pipeline 5, the branch port 11 is located downstream of the oil pump 3, wherein:

when the two-position five-way valve is in a normal working condition, the electromagnetic valve on the first working position of the two-position five-way valve 4 is electrified, so that the interface A on the first working position is communicated with the interface R, the interface B on the first working position is communicated with the interface P, and the interface S is blocked; a first pipeline 1 is used as an oil inlet pipe and communicated with a port B of a first working position, a second pipeline 2 is used as an oil outlet pipe and communicated with a port A of the first working position, an inlet of a connecting pipeline 5 is communicated with a port P of the first working position, an outlet of the connecting pipeline 5 is communicated with a port R of the first working position, and a branch pipe orifice 11 is connected with a port S of the first working position;

when the vehicle is in an emergency stop state, the electromagnetic valve on the second working position of the two-position five-way valve 4 is electrified, so that the interface A ' is communicated with the interface P ', the interface B ' is communicated with the interface S ', and the interface R ' is blocked; at the moment, the second pipeline 2 is used as an oil inlet pipe and communicated with an A ' interface of the second working position, the first pipeline 1 is used as an oil outlet pipe and communicated with a B ' interface of the second working position, an inlet of the connecting pipeline 5 is communicated with a P ' interface of the second working position, the branch pipe port 11 is communicated with an S ' interface of the second working position, and an outlet of the connecting pipeline 5 is communicated with an R ' interface of the second working position.

The power-on state of the electromagnetic two-position five-way valve 4 is controlled according to the instruction of the ECU, the electromagnetic two-position five-way valve 4 is equivalent to a switching value, the system can respond quickly, and the reliability of the system is ensured by utilizing the movement inertia of the oil pump 3 and avoiding the movement of other fuel pipelines.

The particular features, structures, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.