Diesel engine rapid pressure-buildup and low-pressure lubrication method and system

Abstract

The invention discloses a rapid pressure-buildup and low-pressure lubrication method for a diesel engine, relates to the field of engine lubrication, and solves the technical problems that when the engine oil pressure of an existing diesel engine lubrication system is too low, piston cooling deteriorates, movement accessories are poor in lubrication, and engine oil temperature rise and bearing bush temperature rise are too large. The method comprises the steps that firstly, a standard main oil gallery engine oil temperature parameter set is set; 2, a real-time main oil gallery oil pressure value and a preliminary target oil pressure value are obtained, the real-time main oil gallery oil pressure value and the preliminary target oil pressure value are compared, and when the real-time main oil gallery oil pressure value and the preliminary target oil pressure value are not equal, the main oil gallery oil pressure value and the preliminary target oil pressure value are started; and controlling the variable displacement oil pump to enable the real-time main oil duct oil pressure value to be equal to the initial target oil pressure value. The invention further discloses a diesel engine rapid pressure-buildup low-pressure lubricating system. The working reliability of the diesel engine is improved, the consumed work and friction work of accessories are effectively reduced, and the fuel economy is improved.

Description

Technical Field

[0001] The invention relates to the field of engine lubrication, and more specifically, to a diesel engine fast pressure-building low-pressure lubrication method and system. Background Art

[0002] Lubrication is crucial to the engine. Good lubrication can not only reduce the friction and wear of the engine's moving surface, but also has the functions of cleaning, cooling, sealing and anti-corrosion, which can further improve the performance and reliability of the engine. There are generally two types of engine lubrication methods, namely oil-swinging lubrication and forced pressure lubrication.

[0003] like Figure 1 As shown in the figure, the traditional diesel engine lubrication system is generally composed of a lubricating oil pool (oil pan), an oil pump, an oil cooler, an oil filter, and a main oil passage of the engine body. Usually, the engine oil is stored in the lubricating oil pool (oil pan), and the engine oil is transported to the oil cooler through the oil pump for cooling, and then filtered through the oil filter. Finally, the cleaned and cooled engine oil enters the main oil passage of the engine body and is distributed to each moving pair of the diesel engine through a series of oil passages.

[0004] When the diesel engine is shut down, the oil in the oil cooler, oil filter and main oil channel of the engine body will flow back to the lubricating oil pool (oil pan), which is called shutdown reflux. When the diesel engine is started, there is no oil in the oil inlet channel due to shutdown reflux, so there will be a certain time lag in the time for the oil pump to pump out the oil. In addition, the oil needs to fill the oil cooler, oil filter and oil pipes of the oil circuit before lubrication can be achieved. This results in a long pressure building time for the diesel engine's lubrication system, which is prone to dry friction and severe wear of the moving parts, and has a great impact on the reliability of the moving parts.

[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, it can effectively reduce the power consumption and friction work of the accessories, which is beneficial to improving 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 temperature rise, which is not conducive to the normal operation of the diesel engine. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a diesel engine fast pressure building low-pressure lubrication method and system in view of the deficiencies in the prior art, so as to solve the technical problem that when the oil pressure of the existing diesel engine lubrication system is too low, piston cooling is deteriorated, lubrication of moving accessories is poor, and oil temperature rise and bearing temperature rise are too large.

[0007] The invention provides a method for rapid pressure building and low-pressure lubrication of a diesel engine, the method comprising:

[0008] Step 1: Set the standard main oil gallery oil temperature parameter group;

[0009] Step 2: obtaining a real-time main oil gallery oil pressure value and a preliminary target oil pressure value, comparing the real-time main oil gallery oil pressure value with the preliminary target oil pressure value, and when the real-time main oil gallery oil pressure value and the preliminary target oil pressure value are not equal, controlling a variable displacement oil pump to make the real-time main oil gallery oil pressure value and the preliminary target oil pressure value equal;

[0010] Step 3: reducing the real-time main oil gallery oil pressure value by a preset first oil pressure value, and after the main oil gallery oil pressure is stable, collecting the second oil pressure value of the main oil gallery and the real-time main oil gallery oil temperature parameter group, and calculating the main oil gallery oil temperature rise parameter group according to the real-time main oil gallery oil temperature parameter group and the standard main oil gallery oil temperature parameter group;

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

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

[0013] As a further improvement, the method for obtaining the preliminary target oil pressure value is to obtain the average torque and average speed of the engine when it is in a relatively stable operating state, and calibrate the preliminary target oil pressure value according to the average torque and average speed.

[0014] Furthermore, the method for obtaining the average torque and average speed of the engine under a stable operating condition is:

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

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

[0017] Step 3: Compare the maximum torque value with a preset stable torque standard value, and compare the maximum speed value with a 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 state during the cycle; otherwise, it indicates that the engine is in an unstable operating state during the cycle.

[0018] Step 4: When the engine is in a relatively stable operating state, the average torque in the current cycle is subtracted from the average torque in the previous cycle to obtain a torque difference, the average speed in the current cycle is subtracted from the average speed in the previous cycle to obtain a speed difference, the torque difference is compared with a preset torque difference threshold, and the speed difference is compared with a preset speed difference threshold. When 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 in the current cycle are output; otherwise, the average speed and average torque in the current cycle are not output.

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

[0020] When the main oil channel oil pressure value within the starting time is greater than or equal to the preset main oil channel oil pressure starting value, the pre-built pressure oil pump is turned off.

[0021] Furthermore, the standard main oil gallery oil temperature parameter group includes a standard piston throat temperature T 活塞 , Standard main bearing temperature T 主 And the standard connecting rod big end bearing temperature T 连杆 , Standard main oil gallery oil temperature T 机 ;

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

[0023] The main oil channel temperature rise parameter group includes engine 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] T 机油温升 = | T 机-new -T 机 | / S;

[0026] Among them, 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 gallery oil temperature, S is the safety factor;

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

[0028] T 主轴瓦温升 =|T 主-new -T 主 | / ;

[0029] Among them, T 主轴瓦温升 is the main bearing temperature rise, T 主-new is the real-time main bearing temperature, T 主 is the standard main bearing temperature, and S is the safety factor.

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

[0031] T 活塞温升 =|T 活塞-new -T 活塞 | / S;

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

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

[0034] T 连杆温升 =|T 连杆-new -T 连杆 | / S;

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

[0036] A diesel engine rapid pressure-building low-pressure lubrication system, comprising:

[0037] The oil pressure and temperature sensor is used to obtain the real-time main oil gallery oil pressure value and the real-time main oil gallery oil temperature T 机-new , and output the main oil gallery oil pressure signal and the main oil gallery oil temperature signal;

[0038] Wireless temperature sensor, used to obtain real-time piston throat temperature T 活塞-new , Real-time main bearing temperature T 主-new And the real-time connecting rod big end bearing temperature T 连杆-new And output piston throat temperature signal, main bearing temperature signal and connecting rod big end bearing temperature signal;

[0039] A torque and speed module, used to obtain the average torque and average speed of the engine, and output an average torque signal and an average speed signal of the engine;

[0040] a main oil gallery oil pressure module, configured to receive an average torque signal and an average speed signal of the engine, 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;

[0041] A variable displacement oil pump is used to control the oil pressure solenoid valve to change the oil pumping volume of the oil pump;

[0042] A central processing module is used to receive the main oil gallery oil pressure signal, the main oil gallery 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 pair through the above-mentioned diesel engine rapid pressure build-up low-pressure lubrication method.

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

[0045] a lubricating oil sump for enclosing a crankcase of said engine;

[0046] A pre-pressure oil pump, used for pre-pressure building before the engine is started;

[0047] An oil cooler, used to cool the engine oil;

[0048] Oil filter, used for filtering engine oil;

[0049] The oil circuit one-way valve is installed at the oil outlet end of the oil pump of the engine and is used to control the on and off of the oil outlet of the oil pump.

[0050] Beneficial Effects

[0051] The advantages of the present invention are:

[0052] 1. The present invention obtains a preliminary target oil pressure through the average torque and average speed when the engine is in a relatively stable operating state, and controls the main oil channel oil pressure by adjusting the flow of a variable displacement oil pump, thereby reducing the main oil channel oil pressure while meeting the lubrication requirements, ensuring good lubrication of the kinematic pairs, improving the working reliability of the diesel engine, effectively reducing the power consumption and friction work of accessories, and being beneficial to improving fuel economy.

[0053] 2. The present invention sets a starting time and obtains the main oil channel oil pressure value within the starting time before the engine starts. When the main oil channel oil pressure value within the starting time is less than a preset main oil channel oil pressure starting value, the pre-pressure building oil pump is started to make the main oil channel oil pressure value greater than or equal to the main oil channel oil pressure starting value, ensuring that the main oil channel of the engine body has oil of at least the main oil channel oil pressure starting pressure, shortening the pressure building time of the diesel engine's lubrication system, and facilitating rapid oil pumping by the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a schematic diagram of the traditional lubrication oil circuit layout structure;

[0055] Figure 2 It is the working flow chart of the low-pressure lubrication system of the present invention;

[0056] Figure 3 This is a working diagram of the torque speed module of the present invention;

[0057] Figure 4 This is a working diagram of the rapid pressure building system of the present invention;

[0058] Figure 5 This is a schematic diagram of the structure of the diesel engine rapid pressure-building low-pressure lubrication system of the present invention. DETAILED DESCRIPTION

[0059] 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.

[0060] See also Figure 2-Figure 5 A diesel engine rapid pressure building low pressure lubrication method of the present invention, such as Figure 2 As shown, the method includes,

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

[0062] The standard main oil gallery oil temperature parameter group includes the standard piston throat temperature T 活塞 , Standard main bearing temperature T 主 And the standard connecting rod big end bearing temperature T 连杆 , Standard main oil gallery oil temperature T 机 .

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

[0064] Step 2: Obtain the real-time main oil gallery oil pressure value and the preliminary target oil pressure value, compare the real-time main oil gallery oil pressure value with the preliminary target oil pressure value, and when the real-time main oil gallery 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 gallery oil pressure value and the preliminary target oil pressure value equal.

[0065] The method for obtaining the preliminary target oil pressure value is to obtain the average torque and average speed of the engine when it is in a relatively stable operating state, and calibrate the preliminary target oil pressure value according to the average torque and average speed.

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

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

[0068] Step 2: Calculate the average torque, average speed, maximum torque amplitude and maximum speed amplitude during 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. The stable speed marked value in this embodiment is 100r / min, and the stable torque standard value in this embodiment is 10N·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 means that the engine is in a relatively stable working state during the cycle; otherwise, it means that the engine is in an unstable working state during the cycle.

[0070] Step 4: When the engine is in a relatively stable working state, the average torque in this cycle is subtracted from the average torque in the previous cycle to obtain a torque difference, the average speed in this cycle is subtracted from the average speed in the previous cycle to obtain a speed difference, the torque difference is compared with a preset torque difference threshold, and the speed difference is compared with a preset speed difference threshold. When 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 in this cycle are output; otherwise, the average speed and average torque in this cycle are not output. The torque difference threshold in this embodiment is 20N·m, and the speed difference threshold in this embodiment is 200r / min.

[0071] Set the start time, which is 5S in this embodiment. Obtain the main oil gallery oil pressure value within the start time before the engine starts. When the main oil gallery oil pressure value within the start time is less than the preset main oil gallery oil pressure start value, start the pre-built pressure oil pump to make the main oil gallery oil pressure value greater than or equal to the main oil gallery oil pressure start value; in this embodiment, the main oil gallery oil pressure start value is 0.15MkPa.

[0072] When the main oil channel oil pressure value within the startup time is greater than or equal to the preset main oil channel oil pressure startup value, the pre-built pressure oil pump is turned off.

[0073] Step 3: Reduce the real-time main oil gallery oil pressure value to a preset first oil pressure value, and after the main oil gallery oil pressure is stable, collect the second oil pressure value of the main oil gallery and the real-time main oil gallery oil temperature parameter group, and calculate the main oil gallery oil temperature rise parameter group based on the real-time main oil gallery oil temperature parameter group and the standard main oil gallery oil temperature parameter group. In this embodiment, the first oil pressure value is 10 kPa.

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

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

[0076] T 机油温升 =|T 机-new -T 机 | / S;

[0077] Among them, 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 gallery oil temperature, S is the safety factor, and the safety factor S is 0.9.

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

[0079] T 主轴瓦温升 =|T 主-new -T 主 | / S;

[0080] Among them, T 主轴瓦温升 is the main bearing temperature rise, T 主-new is the real-time main bearing temperature, T 主 is the standard main bearing temperature, S is the safety factor, and the safety factor S is 0.9.

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

[0082] T 活塞温升 =|T 活塞-new -T 活塞 | / S;

[0083] Among them, T 活塞温升 is the piston throat temperature rise, T 活塞-new is the real-time piston throat temperature, T 活塞-new is the real-time piston throat temperature, S is the safety factor, and the safety factor S is 0.9.

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

[0085] T 连杆温升 =|T 连杆-new -T 连杆 | / S;

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

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

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

[0089] like Figure 5 As shown, a diesel engine rapid pressure building low pressure lubrication system, which comprises,

[0090] The lubricating oil pool (oil pan) is used to seal the engine's crankcase to prevent impurities from entering the oil tank, collect and store the lubricating oil flowing back from the friction surfaces, dissipate some heat, prevent the lubricating oil from oxidizing, etc. When the diesel engine is stopped, part of the oil will return to the oil pan under the action of gravity.

[0091] The variable displacement oil pump is used to control the oil pressure solenoid valve to change the oil pumping volume. The oil pump is an important component in the lubrication system. Its function is to pressurize the oil and send it to the oil cooler, oil filter and various oil channels to lubricate the various moving parts of the diesel engine. The electronically controlled variable displacement oil pump controls the oil pressure solenoid valve to change the oil pumping volume of the oil pump, thereby achieving control of the oil pressure in the main oil channel.

[0092] The pre-pressure oil pump is used to build up pressure in advance before the engine starts, so as to achieve rapid pressure build-up when the engine starts. The pre-pressure oil pump is controlled by the central processing module. When the oil pressure of the main oil channel where the engine stops and stores oil before starting is less than the starting value of the main oil channel oil pressure, the pre-pressure oil pump works, so that the oil pressure of the main oil channel at least reaches the starting value of the main oil channel oil pressure before starting, so as to achieve rapid lubrication of each moving pair when the diesel engine starts.

[0093] The oil cooler is used to cool the lubricating oil to ensure that the lubricating oil temperature is within the normal working range and to prevent the lubricating oil from becoming ineffective due to excessive temperature and reduced viscosity.

[0094] The oil filter is used to filter the engine oil. As the engine oil circulates continuously in the lubrication system, cleaning the friction surface and taking away the wear debris and other foreign matter, the engine oil may be mixed with foreign matter such as mechanical impurities. In order to ensure the cleanliness of the engine oil and extend its service life, an oil filter is required to clean the engine oil.

[0095] The oil circuit check valve is installed at the oil outlet of the engine oil pump to control the on and off of the oil pump oil outlet. When the diesel engine is working normally, the oil pump outlet pressure is high, the oil circuit check valve is open, and the oil is pumped into the oil cooler, oil filter, main oil channel, etc. by the oil pump; when the diesel engine is stopped, the oil pump does not work, the oil circuit check valve is closed, and the oil in the oil cooler, oil filter and main oil channel of the engine body remains. When it is started again, the oil cooler, oil filter and main oil channel of the engine body have a certain pressure of oil, which shortens the pressure building time of the diesel engine lubrication system.

[0096] The oil pressure and temperature sensor is used to obtain the real-time main oil gallery oil pressure value and the real-time main oil gallery oil temperature T 机-new , and output the main oil gallery oil pressure signal and the main oil gallery oil temperature signal.

[0097] Wireless temperature sensor, used to obtain real-time piston throat temperature T 活塞-new , Real-time main bearing temperature T 主-new And the real-time connecting rod big end bearing temperature T 连杆-new And output the 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 obtain the average torque and average speed of the engine, and output the average torque signal and average speed signal of the engine.

[0099] The main oil channel oil pressure module is used to receive the average torque signal and the average speed signal of the engine, calibrate the initial target oil pressure value according to the average torque signal and the average speed signal of the engine, and output the initial target oil pressure signal.

[0100] The central processing module is used to receive the main oil channel oil pressure signal, the main oil channel 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 pair through the above-mentioned diesel engine rapid pressure build-up low-pressure lubrication method.

[0102] The central processing module is one of the core components of the rapid pressure-building low-pressure lubrication system. Its main functions include regulating the flow of the electronically controlled variable displacement oil pump to adjust the oil pressure in the main oil gallery, obtaining the oil pressure temperature, bearing temperature and piston throat temperature information of the main oil gallery of the engine body in real time while reducing the oil pressure, and monitoring whether the temperature rise of the main components meets the design standards, monitoring the main oil gallery oil pressure value before starting, and controlling the opening and closing status of the pre-pressure-building oil pump.

[0103] Reducing the oil pressure can effectively reduce the power consumption and friction work of accessories, which is beneficial to improving fuel economy, but too low oil pressure can easily cause many problems. In the process of reducing the oil pressure, the oil temperature rise, the piston throat temperature rise and the main bearing temperature rise must be monitored at all times to avoid problems such as oil deterioration and poor lubrication caused by excessive temperature rise, and ensure good lubrication of the diesel engine. The central processing module can gradually reduce the oil pressure by controlling the oil pump displacement based on the initial target oil pressure, thereby achieving the goal of low-pressure lubrication while ensuring the reliability of the diesel engine and improving fuel economy.

[0104] 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 method for rapid pressure build-up and low-pressure lubrication of a diesel engine, characterized in that: The method includes, Step 1: Set the standard main oil gallery oil temperature parameter group; Step 2: obtaining a real-time main oil gallery oil pressure value and a preliminary target oil pressure value, comparing the real-time main oil gallery oil pressure value with the preliminary target oil pressure value, and when the real-time main oil gallery oil pressure value and the preliminary target oil pressure value are not equal, controlling a variable displacement oil pump to make the real-time main oil gallery oil pressure value and the preliminary target oil pressure value equal; Step 3: reducing the real-time main oil gallery oil pressure value by a preset first oil pressure value, collecting a second oil pressure value and a real-time main oil gallery oil temperature parameter group after the main oil gallery oil pressure is stable, and calculating a main oil gallery oil temperature rise parameter group based on the real-time main oil gallery oil temperature parameter group and a standard main oil gallery oil temperature parameter group; Step 4: Compare the main oil gallery oil temperature rise parameter group with a preset main oil gallery oil temperature rise standard parameter group. When the values ​​in the main oil gallery oil temperature rise parameter group are all less than or equal to the values ​​in the main oil gallery oil temperature rise standard parameter group, return to step 3. When the value in the main oil gallery oil temperature rise parameter group is greater than the value in the main oil gallery oil temperature rise standard parameter group, the second oil pressure value is added to the first oil pressure value.

2. A diesel engine rapid pressure build-up low-pressure lubrication method according to claim 1, characterized in that: The method for obtaining the preliminary target oil pressure value is to obtain the average torque and average speed of the engine when it is in a relatively stable working state, and calibrate the preliminary target oil pressure value according to the average torque and average speed.

3. A diesel engine rapid pressure build-up low-pressure lubrication method according to claim 2, characterized in that: The method for obtaining the average torque and average speed of the engine under stable operating conditions is: Step 1: Get the real-time torque and real-time speed within the preset period; Step 2: Calculate the average torque, average speed, maximum torque amplitude and maximum speed amplitude during the period; Step 3: Compare the maximum torque value with a preset stable torque standard value, and compare the maximum speed value with a 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 state during the cycle; otherwise, it indicates that the engine is in an unstable operating state during the cycle. Step 4: when the engine is in a relatively stable working state, the average torque in the current cycle is subtracted from the average torque in the previous cycle to obtain a torque difference value, the average speed in the current cycle is subtracted from the average speed in the previous cycle to obtain a speed difference value, the torque difference value is compared with a preset torque difference threshold value, and the speed difference value is compared 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, the average speed and average torque in the current cycle are output; Otherwise, the average speed and average torque in this cycle will not be output.

4. A diesel engine rapid pressure build-up low-pressure lubrication method according to claim 3, characterized in that: Setting the start time, obtaining the main oil gallery oil pressure value within the start time before the engine is started, and when the main oil gallery oil pressure value within the start time is less than a preset main oil gallery oil pressure start value, starting the pre-pressure oil pump to make the main oil gallery oil pressure value greater than or equal to the main oil gallery oil pressure start value; When the main oil gallery oil pressure value within the startup time is greater than or equal to a preset main oil gallery oil pressure startup value, the pre-pressure oil pump is turned off.

5. A diesel engine rapid pressure build-up low-pressure lubrication method according to claim 1, characterized in that: The standard main oil gallery oil temperature parameter group includes the standard piston throat temperature T 活塞 , Standard main bearing temperature T 主 And the standard connecting rod big end bearing temperature T 连杆 , Standard main oil gallery oil temperature T 机 ; The real-time main oil gallery oil temperature parameter group includes the real-time main oil gallery oil temperature T 机-new , Real-time piston throat temperature T 活塞-new , Real-time main bearing temperature T 主-new And the real-time connecting rod big end bearing temperature T 连杆-new ; The main oil channel temperature rise parameter group includes engine oil temperature rise, piston throat temperature rise, main bearing temperature rise and connecting rod big end bearing temperature rise.

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

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

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

9. A diesel engine rapid pressure build-up low-pressure lubrication system, characterized in that: It includes, The oil pressure and temperature sensor is used to obtain the real-time main oil gallery oil pressure value and the real-time main oil gallery oil temperature T 机-new , and output the main oil gallery oil pressure signal and the main oil gallery oil temperature signal; Wireless temperature sensor, used to obtain real-time piston throat temperature T 活塞-new , Real-time main bearing temperature T 主-new And the real-time connecting rod big end bearing temperature T 连杆-new And output piston throat temperature signal, main bearing temperature signal and connecting rod big end bearing temperature signal; A torque and speed module, used to obtain the average torque and 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, configured to receive an average torque signal and an average speed signal of the engine, 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 used to control the oil pressure solenoid valve to change the oil pumping volume of the oil pump; A central processing module is used to receive the main oil gallery oil pressure signal, the main oil gallery 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; The central processing module controls the variable displacement oil pump to lubricate the moving pair through a diesel engine rapid pressure build-up low-pressure lubrication method as described in any one of claims 1 to 8.

10. A diesel engine rapid pressure build-up low-pressure lubrication system according to claim 9, characterized in that: The system also includes: a lubricating oil sump for enclosing a crankcase of said engine; A pre-pressure oil pump, used for pre-pressure building before the engine is started; An oil cooler, used to cool the engine oil; Oil filter, used for filtering engine oil; The oil circuit one-way valve is installed at the oil outlet end of the oil pump of the engine and is used to control the on and off of the oil outlet of the oil pump.

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