Quick starting device and method for multi-cylinder diesel engine and diesel engine

Abstract

The invention relates to the technical field of diesel engines, and particularly discloses a quick starting device for a multi-cylinder diesel engine, the diesel engine and a method. The quick starting device is suitable for the multi-cylinder diesel engine comprising a first cylinder and a second cylinder, and comprises a connecting pipe which is arranged to be communicated with a first air inlet channel of the first cylinder and a second combustion chamber in the second cylinder; and the stop valve is connected to the connecting pipe and is arranged to selectively open and close a gas passage in the connecting pipe. According to the quick starting device, a part of pipelines and a stop valve are additionally arranged on the basis of the structure of an existing multi-cylinder diesel engine, gas in the exhaust stroke of the diesel engine can be secondarily utilized, the gas inlet temperature is increased in a self-heating mode, and then the low-temperature starting capacity is improved.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engines, and in particular to a multi-cylinder diesel engine quick starting device and method. Background Art

[0002] A diesel engine is an internal combustion engine that uses diesel as fuel. It raises the temperature by compressing air. When the temperature reaches the auto-ignition point of diesel, diesel is injected and mixed with air to form a combustible mixture. After combustion, it pushes the piston to run, thereby generating power. Multi-cylinder diesel engines use multiple cylinders to work alternately. They have the advantages of strong power and stable operation. They can run for a long time in relatively harsh working environments and have higher reliability. In low-temperature environments, diesel engines often have difficulty starting. There are two main reasons. On the one hand, due to the low ambient temperature, the oil temperature is low, the friction resistance torque increases, and the starting system cannot drive the diesel engine to a speed above the ignition speed, making it difficult to start; another reason is that due to the low intake temperature, the temperature at the end of the compression of the diesel engine is also low, which does not meet the ignition requirements of the diesel engine and cannot be started.

[0003] In the prior art, there are several ways to improve the low-temperature starting capability: using auxiliary systems to preheat the engine oil and coolant, reducing the drag torque, increasing the temperature around the combustion chamber, and thus increasing the compression end temperature; increasing the battery capacity to increase the capacity of the starting motor; and adding a preheating device to the intake duct to preheat the intake air using the battery power or the heat from the combustion of fuel to increase the compression end temperature. However, the above-mentioned prior arts all have certain disadvantages: preheating the engine oil and coolant requires sufficient preparation before starting the diesel engine, which is time-consuming and labor-intensive, and often requires additional preheating equipment, and the pipelines and control methods are very complicated; the method of increasing the battery capacity, under low temperature conditions, the discharge capacity of the battery is sharply reduced, and increasing the battery capacity often has little benefit. Improving the capacity of the starting motor often means redundant design. After all, generally speaking, a diesel engine will not be in a low-temperature environment for a long time. When used in a non-low-temperature environment, a large battery capacity and a large-capacity motor will increase the weight of the diesel engine, which is not conducive to the use of the diesel engine. Preheating the intake air through a preheating device makes the diesel engine intake duct more complicated, and it only works during the starting process. The rest of the time it is in a complex working environment of the intake duct, and its reliability is worrying.

[0004] Chinese patent 201611077017.2 discloses a diesel engine quick start structure and method, the core of which is to release the gas in the compression process through solenoid valve control, reduce the compression anti-torque, and increase the diesel engine speed at start-up, so as to achieve quick start. This solution has three problems: First, the compression anti-torque is indeed reduced by venting, which is conducive to the diesel engine starting, but when ignition is required, the solenoid valve must be turned off, and the compression anti-torque continues to recover. In other words, this technology only delays the compression anti-torque, not reduces it; second, when the diesel engine starts, the speed of the starter motor also increases, and the torque provided by the motor is reduced at this time. The compression anti-torque is delayed to this time, which is not conducive to starting from the perspective of torque; third, if the motor overcomes the compression anti-torque, the energy provided by the motor to overcome the compression will be released again during the diesel engine power stroke, which is more conducive to the diesel engine reaching a higher speed. If this part of the energy is released in advance, it is not conducive to the diesel engine reaching a higher speed.

[0005] Therefore, how to effectively improve the low-temperature starting capability has become a technical problem that needs to be urgently solved in the field of diesel engine technology. Summary of the invention

[0006] In view of the shortcomings of the prior art, the main purpose of the present invention is to provide a multi-cylinder diesel engine quick starting device, a diesel engine and a method. The quick starting device adds some pipelines and a stop valve to the structure of the existing multi-cylinder diesel engine, and can improve the low-temperature starting ability by self-heating the diesel engine, and at the same time increase the intake temperature by reusing the gas in the exhaust stroke.

[0007] In order to solve at least one of the above technical problems, the present invention adopts the following technical solution: According to the present invention, a multi-cylinder diesel engine quick starting device is provided, wherein the multi-cylinder diesel engine comprises a first cylinder and a second cylinder. The quick starting device comprises: a connecting pipe, configured to connect a first intake passage of the first cylinder with a second combustion chamber inside the second cylinder; and a shut-off valve, connected to the connecting pipe and configured to selectively open and close a gas passage in the connecting pipe.

[0008] According to an embodiment of the present invention, a first intake valve mounting hole is formed on the first intake passage of the first cylinder, and the shut-off valve is mounted in the first intake valve mounting hole.

[0009] According to an embodiment of the present invention, a second intake valve mounting hole is formed on the second fire surface of the second cylinder, and the shut-off valve is installed in the second intake valve mounting hole.

[0010] According to one embodiment of the present invention, the connecting pipe includes: a first connecting pipe section, configured to connect the first intake passage of the first cylinder and the shut-off valve; and a second connecting pipe section, configured to connect the shut-off valve and a second combustion chamber inside the second cylinder.

[0011] According to an embodiment of the present invention, the stop valve is an electronic stop valve.

[0012] According to one embodiment of the present invention, it also includes a controller that is communicatively connected to the electronic shut-off valve, and the controller is configured to: during the starting process of the multi-cylinder diesel engine, when the second cylinder is in a compression stroke, open the shut-off valve; during the starting process of the multi-cylinder diesel engine, when the second cylinder is in a non-compression stroke, close the shut-off valve; and during the entire normal operation of the multi-cylinder diesel engine, close the shut-off valve.

[0013] According to an embodiment of the present invention, a sealing member is provided at the pipe interface of the connecting pipe.

[0014] According to the present invention, a multi-cylinder diesel engine quick starting method is provided, wherein the multi-cylinder diesel engine comprises a first cylinder, a second cylinder and a multi-cylinder diesel engine quick starting device as described in any of the above embodiments. The quick starting method comprises the following steps: the multi-cylinder diesel engine starts to start, and as the crankshaft rotates, when the second piston moves upward and enters the compression stroke, the gas temperature in the second combustion chamber increases; the shut-off valve is opened to connect the first intake passage of the first cylinder with the second combustion chamber inside the second cylinder, so that the compressed high-temperature gas enters the first intake passage of the first cylinder from the second combustion chamber inside the second cylinder; as the starting continues, when the first cylinder enters the intake stroke, the shut-off valve is closed, and the high-temperature gas is sucked into the first cylinder along with the intake stroke, increasing the compression end temperature to achieve ignition; the starting is completed, and the shut-off valve is closed.

[0015] According to one embodiment of the present invention, the method for quickly starting a multi-cylinder diesel engine further comprises: during the starting process of the multi-cylinder diesel engine, when the second cylinder is in a compression stroke, opening the stop valve; during the starting process of the multi-cylinder diesel engine, when the second cylinder is in a non-compression stroke, closing the stop valve; and during the entire process of normal operation of the multi-cylinder diesel engine, closing the stop valve.

[0016] According to the present invention, there is provided a diesel engine, comprising: a first cylinder; a second cylinder; and the multi-cylinder diesel engine quick starting device described in any one of the above embodiments.

[0017] By adopting the above technical solution, the present invention has at least one of the following advantages compared with the prior art: (1) The device of the present invention is used to modify the existing multi-cylinder diesel engine, which is low-cost and easy to operate; (2) The method according to the present invention can improve the low-temperature starting capability by self-heating the diesel engine; (3) According to the method of the present invention, the gas in the exhaust stroke is reused to increase the intake temperature, thereby achieving rapid starting of a multi-cylinder diesel engine under low temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of a multi-cylinder diesel engine in the prior art; Figure 2 A schematic diagram of a multi-cylinder diesel engine quick starting device according to an embodiment of the present invention; Figure 3 A schematic diagram of a multi-cylinder diesel engine quick starting device according to another embodiment of the present invention; Figure 4 A schematic diagram of a multi-cylinder diesel engine quick starting device according to another embodiment of the present invention; Figure 5 The figure is a flow chart of a method for quickly starting a multi-cylinder diesel engine according to an embodiment of the present invention.

[0020] In the accompanying drawings, 100, a first cylinder, 110, a first cylinder liner, 111, a first combustion chamber, 120, a first fire surface, 130, a first piston, 140, a first intake valve, 150, a first intake passage, 151, a first intake valve mounting hole, 160, a first exhaust valve, 170, a first exhaust passage; 200, a second cylinder, 210, a second cylinder sleeve, 211, a second combustion chamber, 220, a second fire surface, 221, a second intake valve mounting hole, 230, a second piston, 240, a second intake valve, 250, a second intake passage, 260, a second exhaust valve, 270, a second exhaust passage; 300. Quick starting device, 310. Connecting pipe, 311. First connecting pipe section, 312. Second connecting pipe section, 320. Stop valve. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0022] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to appreciate that multiple modifications are feasible without actually departing from the teaching of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the directions or positions indicated by the terms "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the drawings, which are only for the convenience of description and should not be understood as limitations on the present technical solution.

[0024] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0025] The starting of a diesel engine mainly includes the following steps: the intake process, during the intake stroke of the diesel engine, the piston moves downward, the intake valve opens, and air is sucked into the cylinder through the intake duct; the compression process, the piston moves from the bottom dead center to the top dead center, the intake valve and the exhaust valve are closed, and the air is compressed. During the compression process, the temperature and pressure of the air rise sharply, creating conditions for the combustion of the fuel; the combustion process, when the piston approaches the top dead center, the injector sprays high-pressure fuel into the cylinder. Since the air temperature in the cylinder is very high at this time, the fuel is quickly atomized and mixed with the air to form a combustible mixture. Under the action of high temperature and high pressure, the mixture spontaneously ignites, generating a powerful explosive force, pushing the piston downward to do work; the exhaust process, the piston moves from the bottom dead center to the top dead center, the exhaust valve opens, and the exhaust gas after combustion is discharged from the cylinder.

[0026] To start a diesel engine, the starting motor needs to have sufficient capacity to drive the diesel engine and drive it to a certain speed to ensure that the compression end temperature of the diesel engine reaches the compression ignition temperature, so that the diesel engine can be started smoothly. When the diesel engine is started at low temperature, the resistance torque that the starting motor needs to overcome increases, and the intake temperature is low. At the same time, the temperature of the parts around the combustion chamber is also low, which will lead to low compression end temperature and cause starting difficulties.

[0027] During a normal start, the gas sucked into the combustion chamber during the intake stroke is compressed during the compression stroke. The compression force comes from the starter motor. After compression, high-temperature and high-pressure gas is formed. Then, during the power stroke, this part of the gas will do work. At this time, the temperature and pressure are reduced. The gas after work is discharged through the exhaust pipe during the exhaust stroke as the exhaust valve opens. If the temperature at the end of the compression reaches the compression ignition temperature and the diesel is successfully injected, the diesel will be compression-ignited and the start will be successful. Otherwise, the start will fail.

[0028] like Figure 1 As shown, the conventional multi-cylinder diesel engine comprises at least a first cylinder 100 and a second cylinder 200. Specifically, the first cylinder 100 mainly comprises: a first cylinder liner 110; a first fire surface 120 disposed at the top of the first cylinder liner 110; and a first piston 130 installed inside the first cylinder liner 110. The first cylinder liner 110 is the main part of the first cylinder 100, which provides a closed first combustion chamber 111 for the movement of the first piston 130, and bears the gas pressure and the lateral force of the first piston 130. The first fire surface 120 is located at the top of the first cylinder liner 110, and plays the role of closing the cylinder liner and supporting other components. The first fire surface 120 is usually provided with an intake port and an exhaust port, and a first intake valve 140 and a first exhaust valve 160 are respectively installed, which are used to connect the first intake passage 150 and the first exhaust passage 170. In addition, the first fire surface 120 can also leave a position for installing various sensors and seals. Generally, the first firepower surface 120 and the first cylinder sleeve 110 can be fixed by bolts or other connection methods to ensure the sealing of the first cylinder 100. The first piston 130 is a moving part in the first cylinder 100, which performs reciprocating linear motion in the first cylinder sleeve 110 and can be connected to an external mechanism through a piston rod (not shown in the figure) to convert the pressure energy of the gas into mechanical energy. Further, the first cylinder 100 may also include sealing members such as piston rings and sealing rings to prevent gas leakage in the first cylinder 100 and external impurities from entering the first cylinder 100. The second cylinder 200 has a similar structure to the first cylinder 100, including: a second cylinder sleeve 210, a second firepower surface 220 and a second piston 230. Among them, a second combustion chamber 211 is defined in the second cylinder sleeve 210, and a second intake valve 240 and a second exhaust valve 260 are provided on the second firepower surface 220, which are respectively used to connect the second intake passage 250 and the second exhaust passage 270. The piston rod of the first cylinder 100 and the piston rod of the second cylinder 200 may be connected to the crankshaft, and the crankshaft is driven to rotate by the alternating operation of the cylinders.

[0029] According to one aspect of the present invention, a multi-cylinder diesel engine quick starting device is provided, which aims to transform a traditional multi-cylinder diesel engine and achieve the technical effect of quick starting of the multi-cylinder diesel engine under low temperature conditions by combining reasonable operation steps. Figure 2As shown, a multi-cylinder diesel engine quick starting device 300 according to an embodiment of the present invention generally comprises a connecting pipe 310 and a shut-off valve 320. Specifically, the connecting pipe 310 is configured to connect the first intake passage 150 of the first cylinder 100 with the second combustion chamber 211 inside the second cylinder 200, and the shut-off valve 320 is connected to the connecting pipe 310 and configured to selectively open and close the gas passage in the connecting pipe 310. In this embodiment, a first intake valve mounting hole 151 is provided on the first intake passage 150 of the first cylinder 100, and the shut-off valve 320 is installed in the first intake valve mounting hole 151. Thus, the connecting pipe 310 is a complete pipeline, directly connecting the shut-off valve 320 to the second combustion chamber 211 inside the second cylinder 200.

[0030] Figure 3 A multi-cylinder diesel engine quick starting device 300 according to another embodiment of the present invention is shown. Figure 2 The difference of the illustrated embodiment is that a second intake valve mounting hole 221 is provided on the second fire surface 220 of the second cylinder 200, and the shut-off valve 320 is installed in the second intake valve mounting hole 221. Therefore, the connecting pipe 310 is a complete pipeline, directly connecting the shut-off valve 320 to the first intake passage 150 of the first cylinder 100.

[0031] Figure 4 A multi-cylinder diesel engine quick starting device 300 according to another embodiment of the present invention is shown. Figure 2 The difference between the illustrated embodiment is that the connecting pipe 310 comprises: a first connecting pipe section 311, which is configured to connect the first intake passage 150 of the first cylinder 100 and the shut-off valve 320; and a second connecting pipe section 312, which is configured to connect the shut-off valve 320 and the second combustion chamber 211 inside the second cylinder 200. Thus, the shut-off valve 320 is installed at a certain position in the middle of the entire connecting pipe 310. Those skilled in the art can determine the specific installation position of the shut-off valve 320 according to the actual modification environment.

[0032] In an embodiment of the present invention, the stop valve 320 is an electronic stop valve, which can be connected to the controller for communication and perform the following operations under the control of the controller: during the starting process of the multi-cylinder diesel engine, when the second cylinder 200 is in the compression stroke, the stop valve 320 is opened; during the starting process of the multi-cylinder diesel engine, when the second cylinder 200 is in the non-compression stroke, the stop valve 320 is closed; and during the entire process of normal operation of the multi-cylinder diesel engine, the stop valve 320 is closed.

[0033] Preferably, suitable seals may be provided at all interfaces of the newly added component connecting pipe 310 and the stop valve 320 to ensure the sealing of the first cylinder 100 and the second cylinder 200 .

[0034] According to another aspect of the present invention, there is provided a multi-cylinder diesel engine comprising the quick starting device described in any one of the above embodiments.

[0035] According to another aspect of the present invention, a method for quickly starting a multi-cylinder diesel engine is provided, and the method is applicable to a multi-cylinder diesel engine having the quick starting device as described above. The method generally comprises the following steps: Step S101, the multi-cylinder diesel engine starts to start, and as the crankshaft rotates, when the second piston 230 moves upward and enters the compression stroke, the gas temperature in the second combustion chamber 211 increases; Step S102, opening the stop valve 320, connecting the first intake passage 150 of the first cylinder 100 with the second combustion chamber 211 inside the second cylinder 200, so that the compressed high-temperature gas enters the first intake passage 150 of the first cylinder 100 from the second combustion chamber 211 inside the second cylinder 200; Step S103, as the start continues, when the first cylinder 100 enters the intake stroke, the stop valve 320 is closed, and the high-temperature gas is sucked into the first cylinder 100 along with the intake stroke, increasing the compression end temperature to achieve ignition; Step S104, completing the startup, and closing the stop valve 320.

[0036] Based on the above steps, when the multi-cylinder diesel engine is started, the second piston 230 of the second cylinder 200 in the compression stroke moves upward. At this time, the stop valve 320 is opened. After the gas is compressed, it is filled into the first cylinder 100 in the intake stroke through the connecting pipe 310 and the stop valve 320. Due to the compression process, heat is generated, the temperature rises, and the gas enters the first intake passage 150 of the first cylinder 100 through the stop valve 320, driving away the cold air in the first intake passage 150 and replacing it with hot air. After the compression stroke is completed, the stop valve 320 is closed. At this time, the air in the first intake passage 150 of the first cylinder 100 in the intake stroke is a high-temperature gas after a compression and temperature increase, which can eliminate the influence caused by the low temperature, and the high-temperature intake can greatly increase the temperature of the compression end point. Therefore, when the first cylinder 100 is in the compression stroke, a higher compression end point temperature can be obtained, thereby achieving ignition and completing the start.

[0037] Preferably, when the stop valve 320 is an electronic stop valve, it can be controlled by the controller to perform the following operations: during the starting process of the multi-cylinder diesel engine, when the second cylinder 200 is in the compression stroke, the stop valve 320 is opened; during the starting process of the multi-cylinder diesel engine, when the second cylinder 200 is in the non-compression stroke, the stop valve 320 is closed; and during the entire process of normal operation of the multi-cylinder diesel engine, the stop valve 320 is closed.

[0038] The working principle of the multi-cylinder diesel engine quick starting device of the present invention is that at low temperature, the high-temperature and high-pressure gas formed by the compression stroke is discharged into the intake duct of another cylinder through a pipeline, and the low-temperature air in the intake duct of the cylinder is discharged, so that the air inhaled by the cylinder during the intake stroke is no longer low-temperature air, but heated high-temperature air, thereby reducing the influence of low temperature on starting, greatly improving the compression terminal temperature of the cylinder, making it easier to compress and ignite, and smoothly starting the diesel engine, thereby achieving the purpose of improving the cold engine starting capability of the diesel engine.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced by equivalents without departing from the spirit and scope of the present invention, it should be included in the protection scope of the claims of the present invention.

[0040] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention is limited to these examples; under the idea of ​​the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A multi-cylinder diesel engine quick starting device, characterized in that: The multi-cylinder diesel engine comprises a first cylinder (100) and a second cylinder (200), and the quick starting device (300) comprises: A connecting pipe (310) configured to connect the first air intake passage (150) of the first cylinder (100) with the second combustion chamber (211) inside the second cylinder (200); as well as A stop valve (320) is connected to the connecting pipe (310) and is configured to selectively open and close the gas passage in the connecting pipe (310).

2. The multi-cylinder diesel engine quick starting device according to claim 1, characterized in that: A first intake valve mounting hole (151) is provided on the first intake passage (150) of the first cylinder (100), and the stop valve (320) is mounted in the first intake valve mounting hole (151).

3. The multi-cylinder diesel engine quick starting device according to claim 1, characterized in that: A second intake valve mounting hole (221) is provided on the second fire surface (220) of the second cylinder (200), and the stop valve (320) is mounted in the second intake valve mounting hole (221).

4. The multi-cylinder diesel engine quick starting device according to claim 1, characterized in that: The connecting pipe (310) comprises: A first connecting pipe section (311) is configured to connect the first air intake passage (150) of the first cylinder (100) and the stop valve (320); and The second connecting pipe section (312) is configured to connect the stop valve (320) and the second combustion chamber (211) inside the second cylinder (200).

5. The multi-cylinder diesel engine quick starting device according to any one of claims 1 to 4, characterized in that: The stop valve (320) is an electronic stop valve.

6. The multi-cylinder diesel engine quick starting device according to claim 5, characterized in that: It also includes a controller that is in communication with the electronic stop valve, and the controller is configured as follows: During the starting process of the multi-cylinder diesel engine, when the second cylinder (200) is in a compression stroke, opening the stop valve (320); During the starting process of the multi-cylinder diesel engine, when the second cylinder (200) is in a non-compression stroke, closing the stop valve (320); and During the entire process of normal operation of the multi-cylinder diesel engine, the stop valve (320) is closed.

7. The multi-cylinder diesel engine quick starting device according to claim 1, characterized in that: A sealing member is provided at the pipe interface of the connecting pipe (310).

8. A method for quickly starting a multi-cylinder diesel engine, characterized in that: The multi-cylinder diesel engine comprises a first cylinder (100), a second cylinder (200) and a multi-cylinder diesel engine quick starting device according to any one of claims 1 to 7, and the quick starting method comprises the following steps: The multi-cylinder diesel engine starts to start, and as the crankshaft rotates, when the second piston (230) moves upward and enters a compression stroke, the temperature of the gas in the second combustion chamber (211) increases; Opening the stop valve (320) to connect the first intake passage (150) of the first cylinder (100) with the second combustion chamber (211) inside the second cylinder (200), so that the compressed high-temperature gas enters the first intake passage (150) of the first cylinder (100) from the second combustion chamber (211) inside the second cylinder (200); As the start-up continues, when the first cylinder (100) enters an intake stroke, the stop valve (320) is closed, and the high-temperature gas is sucked into the first cylinder (100) along with the intake stroke, thereby increasing the compression end temperature to achieve ignition; After the startup is completed, the stop valve (320) is closed.

9. The multi-cylinder diesel engine quick starting method according to claim 8, characterized in that: Also includes: During the starting process of the multi-cylinder diesel engine, when the second cylinder (200) is in a compression stroke, opening the stop valve (320); During the starting process of the multi-cylinder diesel engine, when the second cylinder (200) is in a non-compression stroke, closing the stop valve (320); and During the entire process of normal operation of the multi-cylinder diesel engine, the stop valve (320) is closed.

10. A diesel engine, characterized in that: Include: First cylinder (100); A second cylinder (200); and A multi-cylinder diesel engine quick starting device (300) as claimed in any one of claims 1 to 7.

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