A method and system for rapid pressure build-up and low pressure lubrication of a diesel engine

Abstract

The application discloses a diesel engine quick pressure building low pressure lubrication method, relates to the field of engine lubrication, and solves the technical problem that the existing diesel engine lubrication system causes piston cooling deterioration, poor lubrication of a moving accessory, and excessive oil temperature rise and bearing bush temperature rise when oil pressure is too low. The method comprises the following steps: step one, setting a standard main oil passage oil temperature parameter group; step two, acquiring a real-time main oil passage oil pressure value and a preliminary target oil pressure value, comparing the real-time main oil passage oil pressure value with the preliminary target oil pressure value, and when the real-time main oil passage oil pressure value is not equal to the preliminary target oil pressure value, making the real-time main oil passage oil pressure value equal to the preliminary target oil pressure value by controlling a variable displacement oil pump. The application further discloses a diesel engine quick pressure building low pressure lubrication system. The application improves the working reliability of the diesel engine, effectively reduces accessory consumption power and friction power, and is beneficial to improving fuel economy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine lubrication, more particularly, it relates to a diesel engine rapid pressure building low pressure lubrication method and system. BACKGROUND

[0002] Lubrication is essential for engines, good lubrication can not only reduce the frictional resistance and wear of the moving surface of the engine, but also has the effects of cleaning, cooling, sealing and anti-corrosion, etc., which can further improve the performance and reliability of the engine. There are generally two kinds of existing engine lubrication methods, namely oil throwing lubrication and forced pressure lubrication.

[0003] As shown in Figure One The traditional diesel engine lubrication system generally consists of a lubricating oil pool (oil sump), an oil pump, an oil cooler, an oil filter and a main oil gallery of the engine body. Generally, the oil is stored in the lubricating oil pool (oil sump), the oil is delivered to the oil cooler by the oil pump for cooling, then filtered through the oil filter, and finally the cleaned and cooled oil enters the main oil gallery of the engine body, and is distributed to each moving pair of the diesel engine through a series of oil galleries.

[0004] When the diesel engine is stopped, the oil in the oil cooler, the oil filter and the main oil gallery of the engine body will flow back to the lubricating oil pool (oil sump), i.e. stop backflow; when the diesel engine is started, since there is no oil in the oil inlet gallery due to stop backflow, the time for the oil pump to pump out oil will have a certain time lag, and the oil needs to fill the oil cooler, the oil filter and the oil pipe of the oil gallery first, before lubrication can be achieved, resulting in a long pressure building time of the lubrication system of the diesel engine, which is prone to cause dry friction and severe wear of the moving pairs, and has a greater impact on the reliability of the moving pairs.

[0005] In addition, oil pressure is an important indicator to ensure the normal operation of the diesel engine lubrication system. When the oil pressure is reduced, the accessory consumption power and friction power can be effectively reduced, which is beneficial to improve fuel economy; but when the oil pressure is too low, it will lead to deterioration of piston cooling, poor lubrication of moving accessories, excessive oil temperature rise and bearing shell temperature rise, which is not conducive to the normal operation of the diesel engine. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a diesel engine rapid pressure building low pressure lubrication method and system to solve the technical problems of existing diesel engine lubrication systems, i.e. piston cooling deterioration, poor lubrication of moving accessories, excessive oil temperature rise and bearing shell temperature rise when the oil pressure is too low.

[0007] The diesel engine rapid pressure building low pressure lubrication method comprises,

[0008] Step 1: setting a standard main oil gallery oil temperature parameter group;

[0009] Step 2: Obtain the real-time main oil passage oil pressure value and the preliminary target oil pressure value. Compare the real-time main oil passage oil pressure value and the preliminary target oil pressure value. When the real-time main oil passage oil pressure value and the preliminary target oil pressure value are not equal, control the variable displacement oil pump to make the real-time main oil passage oil pressure value and the preliminary target oil pressure value equal.

[0010] Step 3: Reduce the real-time main oil passage oil pressure value to a preset first oil pressure value. After the main oil passage oil pressure stabilizes, collect the second oil pressure value of the main oil passage and the real-time main oil passage oil temperature parameter set. Calculate the main oil passage oil temperature rise parameter set based on the real-time main oil passage oil temperature parameter set and the standard main oil passage oil temperature parameter set.

[0011] Step 4: Compare the main oil passage oil temperature rise parameter group with the preset main oil passage oil temperature rise standard parameter group. When the values ​​in the main oil passage oil temperature rise parameter group are all less than or equal to the values ​​in the main oil passage oil temperature rise standard parameter group, return to step 3.

[0012] When the value in the main oil passage oil temperature rise parameter group is greater than the value in the main oil passage oil temperature rise standard parameter group, the second oil pressure value is added to the first oil pressure value.

[0013] To further improve the method, the preliminary target oil pressure value is obtained by acquiring the average torque and average speed of the engine under relatively stable operating conditions, and calibrating the preliminary target oil pressure value based on the average torque and average speed.

[0014] Furthermore, the method for obtaining the average torque and average speed under stable engine operating conditions is as follows:

[0015] Step 1: Obtain real-time torque and real-time speed within a preset period;

[0016] Step 2: Calculate the average torque, average speed, maximum torque amplitude, and maximum speed amplitude within the cycle;

[0017] Step 3: Compare the maximum torque value with the preset stable torque standard value, and compare the maximum speed value with the preset stable speed standard value. When the maximum torque value is less than or equal to the stable torque standard value and the maximum speed value is less than or equal to the preset stable speed standard value, it indicates that the engine is in a relatively stable operating condition during the cycle; otherwise, it indicates that the engine is in an unstable operating condition during the cycle.

[0018] Step 4: When the engine is in a relatively stable operating condition, the torque difference is obtained by subtracting the average torque of the current cycle from the average torque of the previous cycle, and the speed difference is obtained by subtracting the average speed of the current cycle from the average speed of the previous cycle. The torque difference is compared with a preset torque difference threshold, and the speed difference is compared with a preset speed difference threshold. If the torque difference is greater than or equal to the torque difference threshold or the speed difference is greater than or equal to the speed difference threshold, the average speed and average torque of the current cycle are output; otherwise, the average speed and average torque of the current cycle are not output.

[0019] Furthermore, the start-up time is set, and the main oil passage oil pressure value is obtained within the start-up time before the engine starts. When the main oil passage oil pressure value within the start-up time is less than the preset main oil passage oil pressure start-up value, the pre-built pressure oil pump is started to make the main oil passage oil pressure value greater than or equal to the main oil passage oil pressure start-up value.

[0020] When the main oil passage oil pressure value is greater than or equal to the preset main oil passage oil pressure start value during the start-up time, the pre-built compressor oil pump is shut down.

[0021] Furthermore, the standard main oil passage oil temperature parameter set includes the standard piston throat temperature T. 活塞 Standard spindle bearing temperature T 主 and standard connecting rod big end bearing temperature T 连杆 Standard main oil passage oil temperature T 机 ;

[0022] The real-time main oil passage oil temperature parameter group includes the real-time main oil passage oil temperature T. 机-new Real-time piston throat temperature T 活塞-new Real-time spindle bearing temperature T 主-new and real-time connecting rod big end bearing temperature T 连杆-new ;

[0023] The main oil passage oil temperature rise parameter group includes oil temperature rise, piston throat temperature rise, main bearing temperature rise, and connecting rod big end bearing temperature rise.

[0024] Furthermore, the expression for calculating the oil temperature rise is:

[0025]

[0026] Among them, T 机油温升 For oil temperature rise, T 机-new For real-time oil temperature, T 机 The standard main oil passage oil temperature is given by S, where S is the safety factor.

[0027] The expression for calculating the temperature rise of the main bearing is:

[0028]

[0029] Among them, T 主轴瓦温升 Main bearing temperature rise, T 主-new For real-time spindle bearing temperature, T 主 The standard spindle bearing temperature is given by S, which is the safety factor.

[0030] Furthermore, the expression for calculating the temperature rise at the piston throat is as follows:

[0031]

[0032] Among them, T 活塞温升 For piston throat temperature rise, T 活塞-new The real-time piston throat temperature is represented by S, which is the safety factor.

[0033] Furthermore, the expression for calculating the temperature rise of the connecting rod big end bearing is as follows:

[0034]

[0035] Among them, T 连杆温升 For the temperature rise of the connecting rod big end bearing, T 连杆 For standard connecting rod big end bearing temperature, T 连杆-new S represents the real-time temperature of the connecting rod big end bearing, and S is the safety factor.

[0036] A diesel engine rapid pressure build-up low-pressure lubrication system, comprising,

[0037] An oil pressure and temperature sensor is used to acquire the real-time main oil passage oil pressure and the real-time main oil passage oil temperature T. 机-new It also outputs the main oil passage oil pressure signal and the main oil passage oil temperature signal;

[0038] Wireless temperature sensor used to acquire real-time piston throat temperature T 活塞-new Real-time spindle bearing temperature T 主-new and real-time connecting rod big end bearing temperature T 连杆-new It also outputs piston throat temperature signal, main bearing temperature signal, and connecting rod big end bearing temperature signal;

[0039] The torque and speed module is used to acquire the average torque and average speed of the engine and output the average torque signal and average speed signal of the engine.

[0040] The main oil passage oil pressure module is used to receive the average torque signal and average speed signal of the engine, and calibrate the preliminary target oil pressure value according to the average torque signal and average speed signal of the engine and output the preliminary target oil pressure signal.

[0041] A variable displacement oil pump is used to control the oil pressure solenoid valve to change the amount of oil pumped.

[0042] The central processing module is used to receive the main oil passage oil pressure signal, the main oil passage oil temperature signal, the piston throat temperature signal, the main bearing temperature signal, the connecting rod big end bearing temperature signal, and the preliminary target oil pressure signal.

[0043] The central processing module controls the variable displacement oil pump to lubricate the moving parts through the aforementioned diesel engine rapid pressure build-up and low-pressure lubrication method.

[0044] As a further improvement, the system also includes:

[0045] A lubricating oil sump, used to seal the crankcase of the engine;

[0046] A pre-pressurization oil pump is used to build up pressure before the engine starts;

[0047] An oil cooler is used to cool engine oil.

[0048] An oil filter is used to filter engine oil.

[0049] An oil circuit check valve is installed at the oil outlet of the engine's oil pump to control the flow of oil from the oil pump.

[0050] Beneficial effects

[0051] The advantages of this invention are:

[0052] 1. This invention obtains the initial target oil pressure by measuring the average torque and average speed of the engine when it is in a relatively stable operating condition, and controls the main oil passage oil pressure by adjusting the flow rate of the variable displacement oil pump. This reduces the main oil passage oil pressure while meeting lubrication requirements, ensuring good lubrication of moving parts, improving the reliability of the diesel engine, effectively reducing accessory consumption and friction work, and improving fuel economy.

[0053] 2. This invention sets a start-up time and obtains the main oil passage oil pressure value within the start-up time before engine start-up. When the main oil passage oil pressure value within the start-up time is less than the preset main oil passage oil pressure start-up value, the pre-pressurized oil pump is started to make the main oil passage oil pressure value greater than or equal to the main oil passage oil pressure start-up value, ensuring that the main oil passage of the engine body contains at least the main oil passage oil pressure start-up pressure oil, shortening the pressure build-up time of the diesel engine's lubrication system, and facilitating the rapid oil pumping of the oil pump. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of a traditional lubrication circuit layout.

[0055] Figure 2This is a flowchart illustrating the low-pressure lubrication system of the present invention.

[0056] Figure 3 This is a flowchart illustrating the operation of the torque and speed module of the present invention.

[0057] Figure 4 This is a flowchart illustrating the rapid pressure build-up system of the present invention.

[0058] Figure 5 This is a schematic diagram of the diesel engine rapid pressure build-up low-pressure lubrication system of the present invention. Detailed Implementation

[0059] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0060] See Figures 2-5 The present invention provides a method for rapid pressure build-up and low-pressure lubrication of a diesel engine, such as... Figure 2 As shown, the method includes,

[0061] Step 1: Set the standard main oil passage oil temperature parameter group.

[0062] The standard main oil passage oil temperature parameter set includes the standard piston throat temperature T. 活塞 Standard spindle bearing temperature T 主 and standard connecting rod big end bearing temperature T 连杆 Standard main oil passage oil temperature T 机 .

[0063] The real-time main oil passage oil temperature parameter group includes the real-time main oil passage oil temperature T. 机-new Real-time piston throat temperature T 活塞-new Real-time spindle bearing temperature T 主-new and real-time connecting rod big end bearing temperature T 连杆-new .

[0064] Step 2: Obtain the real-time main oil passage oil pressure value and the initial target oil pressure value. Compare the real-time main oil passage oil pressure value and the initial target oil pressure value. When the real-time main oil passage oil pressure value and the initial target oil pressure value are not equal, control the variable displacement oil pump to make the real-time main oil passage oil pressure value and the initial target oil pressure value equal.

[0065] The method for obtaining the initial target oil pressure value is to obtain the average torque and average speed of the engine under relatively stable operating conditions, and calibrate the initial target oil pressure value based on the average torque and average speed.

[0066] The method for obtaining the average torque and average speed of the engine under stable operating conditions is as follows:

[0067] Step 1: Obtain the real-time torque and real-time speed within a preset period. In this embodiment, one period is 5 seconds.

[0068] Step 2: Calculate the average torque, average speed, maximum torque amplitude, and maximum speed amplitude within the cycle.

[0069] Step 3: Compare the maximum torque amplitude with the preset stable torque standard value, and compare the maximum speed amplitude with the preset stable speed standard value. In this embodiment, the stable speed standard value is 100 r / min, and the stable torque standard value is 10 N·m. When the maximum torque amplitude is less than or equal to the stable torque standard value and the maximum speed amplitude is less than or equal to the preset stable speed standard value, it indicates that the engine is in a relatively stable operating condition during the cycle; otherwise, it indicates that the engine is in an unstable operating condition during the cycle.

[0070] Step 4: When the engine is in a relatively stable operating condition, the torque difference is obtained by subtracting the average torque of the current cycle from the average torque of the previous cycle, and the speed difference is obtained by subtracting the average speed of the current cycle from the average speed of the previous cycle. The torque difference is compared with a preset torque difference threshold, and the speed difference is compared with a preset speed difference threshold. If the torque difference is greater than or equal to the torque difference threshold, or the speed difference is greater than or equal to the speed difference threshold, then the average speed and average torque of the current cycle are output; otherwise, the average speed and average torque of the current cycle are not output. In this embodiment, the torque difference threshold is 20 N·m, and the speed difference threshold is 200 r / min.

[0071] The start-up time is set to 5 seconds in this embodiment. The main oil passage oil pressure value is obtained during the start-up time before engine start-up. When the main oil passage oil pressure value is less than the preset main oil passage oil pressure start-up value during the start-up time, the pre-built pressure oil pump is started to make the main oil passage oil pressure value greater than or equal to the main oil passage oil pressure start-up value. In this embodiment, the main oil passage oil pressure start-up value is 0.15 MPa.

[0072] If the main oil passage oil pressure value is greater than or equal to the preset main oil passage oil pressure start value during the start-up time, the pre-built compressor oil pump will be shut down.

[0073] Step 3: Reduce the real-time main oil passage oil pressure to a preset first oil pressure value. After the main oil passage oil pressure stabilizes, collect the second oil pressure value and the real-time main oil passage oil temperature parameter set. Calculate the main oil passage oil temperature rise parameter set based on the real-time and standard main oil passage oil temperature parameter sets. In this embodiment, the first oil pressure value is 10 kPa.

[0074] The main oil passage oil temperature rise parameter group includes oil temperature rise, piston throat temperature rise, main bearing temperature rise, and connecting rod big end bearing temperature rise.

[0075] The expression for the computer oil temperature rise is:

[0076]

[0077] Among them, T 机油温升 For oil temperature rise, T 机-new For real-time oil temperature, T 机 The standard main oil passage oil temperature is given by S, which is a safety factor of 0.9.

[0078] The expression for calculating the temperature rise of the main bearing is:

[0079]

[0080] Among them, T 主轴瓦温升 Main bearing temperature rise, T 主-new For real-time spindle bearing temperature, T 主 The standard spindle bearing temperature is given by S, which is a safety factor of 0.9.

[0081] The expression for calculating the piston throat temperature rise is:

[0082]

[0083] Among them, T 活塞温升 For piston throat temperature rise, T 活塞-new The real-time piston throat temperature is given by S, which is a safety factor of 0.9.

[0084] The expression for calculating the temperature rise of the connecting rod big end bearing is:

[0085]

[0086] Among them, T 连杆温升 For the temperature rise of the connecting rod big end bearing, T 连杆 For standard connecting rod big end bearing temperature, T 连杆-new The real-time temperature of the connecting rod big end bearing is given by S, which is a safety factor of 0.9.

[0087] Step 4: Compare the main oil passage oil temperature rise parameter set with the preset main oil passage oil temperature rise standard parameter set. If all values ​​in the main oil passage oil temperature rise parameter set are less than or equal to the values ​​in the main oil passage oil temperature rise standard parameter set, return to Step 3; if the values ​​in the main oil passage oil temperature rise parameter set are greater than the values ​​in the main oil passage oil temperature rise standard parameter set, add the second oil pressure value to the first oil pressure value.

[0088] The standard parameter group for main oil passage oil temperature rise includes standard oil temperature rise, standard piston throat temperature rise, standard main bearing temperature rise, and standard connecting rod big end bearing temperature rise. In this embodiment, the standard oil temperature rise is 20°C, the standard piston throat temperature rise is 20°C, the standard main bearing temperature rise is 30°C, and the standard connecting rod big end bearing temperature rise is 50°C.

[0089] like Figure 5 As shown, a diesel engine rapid pressure build-up low-pressure lubrication system includes,

[0090] The lubricating oil sump (oil pan) is used to seal the crankcase of the engine, prevent impurities from entering the oil pan, collect and store the lubricating oil flowing back from the various friction surfaces, dissipate some heat, and prevent the lubricating oil from oxidizing. When the diesel engine is stopped, some of the oil will return to the oil pan due to gravity.

[0091] A variable displacement oil pump is used to control the oil pressure solenoid valve to change the amount of oil pumped. The oil pump is a crucial component of the lubrication system; its function is to pressurize the oil and deliver it to the oil cooler, oil filter, and various oil passages to lubricate the moving parts of the diesel engine. The electronically controlled variable displacement oil pump changes the amount of oil pumped by controlling the oil pressure solenoid valve, thereby controlling the oil pressure in the main oil passage.

[0092] The pre-pressurization oil pump is used to build up pressure before engine start-up, thus enabling rapid pressure build-up during engine startup. Controlled by the central processing module, the pre-pressurization oil pump operates when the main oil passage pressure (which was stored before startup) is lower than the starting pressure value. This ensures that the main oil passage pressure reaches at least the starting value before startup, achieving rapid lubrication of all moving parts during diesel engine startup.

[0093] An oil cooler is used to cool lubricating oil, ensuring that the oil temperature remains within the normal operating range and preventing the lubricating oil from failing due to excessive temperature and reduced viscosity.

[0094] An oil filter is used to filter engine oil. Because engine oil continuously circulates within the lubrication system, cleaning friction surfaces and carrying away metal shavings and other foreign matter, it will inevitably contain mechanical impurities and other foreign matter. To ensure clean engine oil and extend its service life, an oil filter is necessary to keep the oil clean.

[0095] The oil circuit check valve, installed at the oil pump outlet of the engine, controls the flow of oil from the pump. When the diesel engine is operating normally, the oil pump output pressure is high, the oil circuit check valve opens, and oil is pumped into the oil cooler, oil filter, and main oil passage. When the diesel engine stops, the oil pump stops working, the oil circuit check valve closes, and oil remains in the oil cooler, oil filter, and main oil passage. Upon restarting, the presence of pressurized oil in these areas shortens the pressure build-up time of the diesel engine's lubrication system.

[0096] An oil pressure and temperature sensor is used to acquire the real-time main oil passage oil pressure and the real-time main oil passage oil temperature T. 机-new It outputs the main oil passage oil pressure signal and the main oil passage oil temperature signal.

[0097] Wireless temperature sensor used to acquire real-time piston throat temperature T 活塞-new Real-time spindle bearing temperature T 主-new and real-time connecting rod big end bearing temperature T 连杆-new It also outputs piston throat temperature signal, main bearing temperature signal, and connecting rod big end bearing temperature signal.

[0098] The torque and speed module is used to acquire the engine's average torque and average speed, and output the engine's average torque signal and average speed signal.

[0099] The main oil passage oil pressure module is used to receive the engine's average torque signal and average speed signal, and calibrate the initial target oil pressure value based on the engine's average torque signal and average speed signal, and output the initial target oil pressure signal.

[0100] The central processing module is used to receive the main oil passage oil pressure signal, the main oil passage oil temperature signal, the piston throat temperature signal, the main bearing temperature signal, the connecting rod big end bearing temperature signal, and the preliminary target oil pressure signal.

[0101] The central processing module controls the variable displacement oil pump to lubricate the moving parts through the aforementioned diesel engine rapid pressure build-up and low-pressure lubrication method.

[0102] The central processing module is one of the core components of the rapid pressure build-up low-pressure lubrication system. Its main functions include regulating the flow rate of the electronically controlled variable displacement oil pump to adjust the main oil passage oil pressure; while reducing the oil pressure, it can acquire real-time information on the main oil passage oil pressure and temperature, bearing temperature, and piston throat temperature, and monitor whether the temperature rise of major components meets the design specifications; monitor the main oil passage oil pressure value before startup; and control the opening and closing status of the pre-pressure build-up oil pump.

[0103] Lowering oil pressure can effectively reduce accessory wear and friction, thus improving fuel economy. However, excessively low oil pressure can easily cause various problems. During the process of reducing oil pressure, it is essential to constantly monitor the oil temperature rise, piston throat temperature rise, and main bearing temperature rise to avoid problems such as oil deterioration and poor lubrication caused by excessive temperature rise, ensuring good lubrication of the diesel engine. The central processing module can gradually reduce the oil pressure based on the initial target oil pressure by controlling the oil pump displacement, thereby achieving the goal of low-pressure lubrication while ensuring the reliability of the diesel engine and improving fuel economy.

[0104] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method of fast build-up low pressure lubrication of a diesel engine, characterized in that The method comprises, Step one: setting a standard main oil passage engine oil temperature parameter group; Step two: obtaining a real-time main oil passage engine oil pressure value and a preliminary target engine oil pressure value, comparing the real-time main oil passage engine oil pressure value with the preliminary target engine oil pressure value, and when the real-time main oil passage engine oil pressure value is not equal to the preliminary target engine oil pressure value, making the real-time main oil passage engine oil pressure value equal to the preliminary target engine oil pressure value by controlling a variable displacement engine oil pump; Step three: reducing the real-time main oil passage engine oil pressure value by a preset first engine oil pressure value, collecting a second engine oil pressure value and a real-time main oil passage engine oil temperature parameter group after the main oil passage engine oil pressure stabilizes, and calculating a main oil passage engine oil temperature rise parameter group according to the real-time main oil passage engine oil temperature parameter group and the standard main oil passage engine oil temperature parameter group; Step four: comparing the main oil passage engine oil temperature rise parameter group with a preset main oil passage engine oil temperature rise standard parameter group, when the values in the main oil passage engine oil temperature rise parameter group are all less than or equal to the values in the main oil passage engine oil temperature rise standard parameter group, returning to step three; and when the values in the main oil passage engine oil temperature rise parameter group are greater than the values in the main oil passage engine oil temperature rise standard parameter group, adding the second engine oil pressure value and the first engine oil pressure value. The method for obtaining the preliminary target engine oil pressure value is to obtain an average torque and an average speed under a relatively stable working condition of the engine, and to calibrate the preliminary target engine oil pressure value according to the average torque and the average speed.

2. A method of rapid pressure build-up low pressure lubrication of a diesel engine according to claim 1, characterized in that, The method for obtaining the average torque and the average speed under the stable working condition of the engine is as follows:

3. A method of rapid pressure build-up low pressure lubrication of a diesel engine according to claim 2, characterized in that First step: obtaining a real-time torque and a real-time speed within a preset period; Second step: calculating an average torque, an average speed, a maximum torque amplitude and a maximum speed amplitude within the period; Third step: comparing the maximum torque amplitude with a preset stable torque standard value, and comparing the maximum speed amplitude with a preset stable speed standard value, when the maximum torque amplitude is less than or equal to the stable torque standard value and the maximum speed amplitude is less than or equal to the preset stable speed standard value, it is indicated that the engine is in a relatively stable working condition within the period; otherwise, it is indicated that the engine is in an unstable working condition within the period; Fourth step: when the engine is in a relatively stable working condition, obtaining a torque difference value by subtracting an average torque in a previous period from an average torque in the current period, obtaining a speed difference value by subtracting an average speed in the previous period from the average speed in the current period, comparing the torque difference value with a preset torque difference threshold value, and comparing the speed difference value with a preset speed difference threshold value, when the torque difference value is greater than or equal to the torque difference threshold value or the speed difference value is greater than or equal to the speed difference threshold value, outputting the average speed and the average torque in the current period; otherwise, not outputting the average speed and the average torque in the current period. Setting a starting time, obtaining a main oil passage engine oil pressure value within the starting time before the engine starts, and when the main oil passage engine oil pressure value within the starting time is less than a preset main oil passage engine oil pressure starting value, starting a pre-built pressure engine oil pump to make the main oil passage engine oil pressure value greater than or equal to the main oil passage engine oil pressure starting value. ​ 4. A method of rapid pressure build-up low pressure lubrication of a diesel engine according to claim 3, characterized in that, ​ When the main oil gallery oil pressure value is greater than or equal to the preset main oil gallery oil pressure starting value within the starting time, the pre-pressurization oil pump is closed.

5. A method of fast build-up of pressure and low pressure lubrication for a diesel engine as claimed in claim 1 wherein, The standard main gallery oil temperature parameter group includes a standard piston throat temperature T 活塞 , a standard main bearing temperature T 主 , and a standard big end bearing temperature T 连杆 , a standard main gallery oil temperature T 机 ; The real-time main oil gallery engine oil temperature parameter group includes a real-time main oil gallery engine oil temperature T 机-new , a real-time piston throat temperature T 活塞-new , a real-time main bearing temperature T 主-new , and a real-time big end bearing temperature T 连杆-new ; The main oil gallery oil temperature rise parameter group comprises an oil temperature rise, a piston throat temperature rise, a main bearing bush temperature rise, and a connecting rod big end bearing bush temperature rise.

6. A method of rapid pressure build-up low pressure lubrication of a diesel engine according to claim 5, characterized in that, The expression for calculating the oil temperature rise is: Where T 机油温升 is the oil temperature rise, T 机-new is the real-time oil temperature, T 机 is the standard main oil passage oil temperature, and S is a safety factor. The expression for calculating the main bearing bush temperature rise is: Where T 主轴瓦温升 is the temperature rise of the main bearing bush, T 主-new is the real-time temperature of the main bearing bush, T 主 is the standard temperature of the main bearing bush, and S is the safety factor.

7. A method of rapid pressure build-up low pressure lubrication of a diesel engine according to claim 5, characterized in that, The expression for calculating the piston throat temperature rise is: Where T 活塞温升 is the piston throat temperature rise, T 活塞-new is the real-time piston throat temperature, and S is the safety factor.

8. A method of rapid pressure build-up low pressure lubrication of a diesel engine according to claim 5, characterized in that, The expression for calculating the connecting rod big end bearing bush temperature rise is: Wherein, T 连杆温升 is the connecting rod big end bushing temperature rise, T 连杆 is the standard connecting rod big end bushing temperature, T 连杆-new is the real-time connecting rod big end bushing temperature, and S is the safety factor.

9. A diesel fast build-up low pressure lubrication system, characterized in that It comprises, An oil pressure temperature sensor is used to acquire real-time main oil passage oil pressure value and real-time main oil passage oil temperature T 机-new And output main oil passage oil pressure signal and main oil passage oil temperature signal; A wireless temperature sensor is used to acquire real-time piston throat temperature T 活塞-new , real-time main bearing temperature T 主-new , and real-time big end bearing temperature T 连杆-new , and output piston throat temperature signal, main bearing temperature signal and big end bearing temperature signal. A torque speed module is configured to obtain an average torque and an average speed of the engine, and output an average torque signal and an average speed signal of the engine; A main oil gallery oil pressure module is configured to receive the average torque signal and the average speed signal of the engine, and calibrate a preliminary target oil pressure value according to the average torque signal and the average speed signal of the engine, and output a preliminary target oil pressure signal; A variable displacement oil pump is configured to control an oil pressure electromagnetic valve to change the oil pumping amount of the oil pump; A central processing module is configured to receive the main oil gallery oil pressure signal, a main oil gallery oil temperature signal, a piston throat temperature signal, a main bearing bush temperature signal, a connecting rod big end bearing bush temperature signal, and a preliminary target oil pressure signal; The central processing module controls the variable displacement oil pump to lubricate the moving pair by the method of claim 1-8.

10. A low pressure force built-up rapid diesel engine lubrication system according to claim 9, characterized in that, The system further comprises: A lubricating oil pool is configured to enclose the crankcase of the engine; A pre-pressurization oil pump is configured to pre-pressurize before the engine starts; An oil cooler is configured to cool the oil; An oil filter is configured to filter the oil; An oil way check valve is installed at the oil pump outlet end of the engine, and is configured to control the on-off of the oil pump outlet.

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