Lubricating and cooling control method for high-horsepower diesel engine

Abstract

The invention discloses a high-horsepower diesel engine lubrication and cooling control method, and relates to an engine lubrication technology, when an ECU receives a high-horsepower diesel engine starting instruction, firstly, an oil pump is controlled to be started to provide lubricating oil for a part kinematic pair, meanwhile, whether the oil pressure reaches a preset pressure threshold value or not is detected, and if yes, the engine is started; if yes, the ECU automatically activates a high-horsepower diesel engine starting instruction to start the high-horsepower diesel engine; and when the high-horsepower diesel engine flames out and stops, whether an oil pump needs to be activated for post-lubrication or not is judged according to the running duration before the high-horsepower diesel engine flames out and the running rotating speed during flameout, and if yes, the oil pump is controlled to be started, and the oil pump runs for the set post-lubrication duration. According to the high-horsepower diesel engine, parts inside the high-horsepower diesel engine are lubricated before the high-horsepower diesel engine is started and when the high-horsepower diesel engine is stopped, the lubricating performance of the parts after the high-horsepower diesel engine is stopped is ensured, frictional wear during the high-horsepower diesel engine is stopped is reduced, and the effect of prolonging the service life of the high-horsepower diesel engine is achieved.

Description

Technical Field

[0001] The invention relates to engine lubrication technology, and more particularly to a high-horsepower diesel engine lubrication and cooling control method. Background Art

[0002] High-horsepower diesel engines are valuable and are matched with large equipment such as mining machinery, large ships, and generator sets. The reliability of diesel engine operation is of great concern. During the startup process, the diesel engine needs to overcome the friction resistance of the moving parts. At this time, there is no oil between the moving parts, and there is no oil film on the moving parts. The friction resistance is large. The larger the engine displacement, the greater the friction resistance. After long-term operation, the friction of the moving parts of the diesel engine is serious, which will cause great damage to the crankshaft bearing and crankshaft journal, affecting its life.

[0003] In the existing technology, large emergency standby units periodically start the oil pump for pre-lubrication. However, in high-horsepower diesel engines, due to the large size of each component and the large amount of heat storage, even after shutdown, there is still high temperature and heat between the moving pairs of components. When shut down, the moving pairs of components still rotate under the action of inertia, but the oil pump has stopped working, so that the moving pairs of components after shutdown cannot be adequately lubricated, resulting in a large friction resistance between the moving pairs of components. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-horsepower diesel engine lubrication and cooling control method in view of the deficiencies of the prior art, so as to achieve lubrication of the internal parts of the high-horsepower diesel engine before starting and when stopping.

[0005] A high-horsepower diesel engine lubrication and cooling control method according to the present invention comprises:

[0006] The pre-start lubrication step is used for, when the ECU receives a command to start the high-horsepower diesel engine, first controlling the oil pump to start and provide lubricating oil to the moving parts of the components, and at the same time detecting whether the oil pressure reaches a preset pressure threshold. If so, the ECU automatically activates the high-horsepower diesel engine start command to start the high-horsepower diesel engine;

[0007] The post-shutdown lubrication step is used to determine whether it is necessary to activate the oil pump for post-lubrication when the high-horsepower diesel engine is shut down, based on the running time before the high-horsepower diesel engine is shut down and the running speed when it is shut down. If necessary, the oil pump is controlled to start and run for the set post-lubrication time.

[0008] Preferably, when the operating speed exceeds a set speed threshold, the lubrication time after the oil pump is activated.

[0009] Preferably, when the operating speed is less than a set speed threshold, and the operating time is less than a set time threshold, the lubrication time after the oil pump is activated.

[0010] Preferably, in the pre-start lubrication step, if the engine oil pressure does not reach the pressure threshold, an emergency start command is activated by a manual button to start the high-horsepower diesel engine.

[0011] Preferably, a maximum lubrication time before starting is set, and when the high-horsepower diesel engine still fails to start after exceeding the maximum lubrication time before starting, an oil pump fault instruction is generated, and a manual start prompt message is generated at the same time.

[0012] Preferably, when the oil pump is working, the ECU monitors in real time whether the oil pump has a fault, and if the oil pump has a fault, a stop command is generated to stop the oil pump from working.

[0013] Beneficial Effects

[0014] The advantages of the present invention are:

[0015] 1. After the high-horsepower diesel engine is turned off, the ECU can automatically trigger the oil pump to work for post-lubrication according to the running speed and duration of the high-horsepower diesel engine before it is turned off, so as to cool and lubricate the high-temperature parts such as the moving parts, ensure the post-shutdown lubrication performance between the parts, reduce the friction and wear during shutdown, and play a role in prolonging the life of the high-horsepower diesel engine.

[0016] 2. The pre-lubrication function is associated with the high-horsepower diesel engine start function, that is, after the pre-lubrication is completed, the high-horsepower diesel engine is automatically activated for start. This design ensures that the internal parts of the high-horsepower diesel engine can be fully lubricated before starting, ensuring the reliability of the high-horsepower diesel engine start. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic flow chart of the high-horsepower diesel engine lubrication and cooling control method of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the lubrication system of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0020] See also Figure 1-Figure 2 The present invention discloses a high-horsepower diesel engine lubrication and cooling control method, which includes a pre-start lubrication step and a post-stop lubrication step.

[0021] like Figure 1 As shown in the figure, in the lubrication system, the ECU is connected to the oil pump relay, oil pressure sensor, and vehicle control unit (VCU) through a wiring harness, and exchanges information and control through analog and digital signals. This structure can realize the pre-lubrication function before starting a high-horsepower diesel engine, and can automatically start the diesel engine when the oil pressure reaches the set value.

[0022] Specifically, the pre-start lubrication step is used to control the oil pump relay to close when the ECU receives a command to start a high-horsepower diesel engine, and the oil pump starts to work to provide lubricating oil for the moving parts of the components. When the oil pump is working, the ECU detects in real time whether the oil pressure reaches the preset pressure threshold, and also detects whether the continuous working time of the oil pump exceeds the maximum oil supply time of the pre-start lubrication and whether there is any fault in the oil pump.

[0023] If the oil pressure reaches the preset pressure threshold, the ECU automatically activates the high-horsepower diesel engine start command to start the high-horsepower diesel engine. However, before the oil pressure reaches the pressure threshold, if the high-horsepower diesel engine needs to be started urgently, the emergency start command can be activated by the manual button to start the high-horsepower diesel engine.

[0024] In the pre-start lubrication step, when the high-horsepower diesel engine still fails to start after exceeding the maximum lubrication time before start, that is, the oil pump running time exceeds the maximum lubrication time before start, an oil pump fault instruction is generated, and a manual start prompt message is generated at the same time to prompt the staff to perform an emergency start of the high-horsepower diesel engine through the manual button.

[0025] When the oil pump is working, the ECU monitors in real time whether there is any fault in the oil pump. If there is a fault in the oil pump, a stop command is generated to stop the oil pump from working to protect it, and the command to automatically start the high-horsepower diesel engine is canceled at the same time.

[0026] The post-shutdown lubrication step is used to determine whether it is necessary to activate the oil pump for post-lubrication when the high-horsepower diesel engine is shut down, based on the running time before the high-horsepower diesel engine is shut down and the running speed when it is shut down, so as to realize the lubrication function of the high-horsepower diesel engine after it is shut down.

[0027] Specifically, when the operating speed of a high-horsepower diesel engine exceeds the speed threshold, the oil pump is activated to run the post-lubrication time. When the operating speed of a high-horsepower diesel engine is too high, due to the high internal heat, activating the oil pump for post-lubrication can ensure the lubrication performance of the high-horsepower diesel engine after shutdown, while also effectively cooling it down and reducing its internal wear during shutdown. In addition, when the operating speed is less than the set speed threshold, and the operating time is less than the set time threshold, the oil pump is activated to run the post-lubrication time. This design mainly takes into account the problem of insufficient lubrication when starting a high-horsepower diesel engine for a short time and at a low speed. Therefore, under such working conditions, the method of activating the oil pump for post-lubrication can effectively solve this problem.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A high-horsepower diesel engine lubrication and cooling control method, characterized in that: The method is: The pre-start lubrication step is used for, when the ECU receives a command to start the high-horsepower diesel engine, first controlling the oil pump to start and provide lubricating oil to the moving parts of the components, and at the same time detecting whether the oil pressure reaches a preset pressure threshold. If so, the ECU automatically activates the high-horsepower diesel engine start command to start the high-horsepower diesel engine; The post-shutdown lubrication step is used to determine whether it is necessary to activate the oil pump for post-lubrication when the high-horsepower diesel engine is shut down, based on the running time before the high-horsepower diesel engine is shut down and the running speed when it is shut down. If necessary, the oil pump is controlled to start and run for the set post-lubrication time.

2. A high-horsepower diesel engine lubrication and cooling control method according to claim 1, characterized in that: When the operating speed exceeds a set speed threshold, the oil pump is activated to operate the lubrication time.

3. A high-horsepower diesel engine lubrication and cooling control method according to claim 1, characterized in that: When the operating speed is less than a set speed threshold, and the operating time is less than a set time threshold, the oil pump is activated to operate the lubrication time.

4. A high-horsepower diesel engine lubrication and cooling control method according to claim 1, characterized in that: In the pre-start lubrication step, if the engine oil pressure does not reach the pressure threshold, an emergency start command is activated by a manual button to start the high-horsepower diesel engine.

5. A high-horsepower diesel engine lubrication and cooling control method according to claim 4, characterized in that: A maximum lubrication time before starting is set. When the high-horsepower diesel engine still fails to start after exceeding the maximum lubrication time before starting, an oil pump fault instruction is generated, and a manual start prompt message is generated at the same time.

6. A high-horsepower diesel engine lubrication and cooling control method according to claim 1, characterized in that: When the oil pump is working, the ECU monitors in real time whether the oil pump has any faults. If the oil pump has any faults, a stop command is generated to stop the oil pump from working.

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