Diesel engine cylinder lubricating oil injection amount correction system and correction method

Abstract

The application discloses a diesel engine cylinder lubricating oil injection volume correction system and a correction method. The system comprises an oil volume correction unit, a plurality of cylinder units arranged in parallel, a main pipeline, a branch pipeline and a dirty oil detection unit. The oil volume correction unit comprises a data processor, a controller and a PC terminal. Each cylinder unit comprises a cylinder, an oil injector, a first electromagnetic valve and a three-way valve. The dirty oil detection unit comprises a dirty oil drain tank, a metal particle sensor, a pH meter, a second electromagnetic valve and a two-way valve. The diesel engine cylinder lubricating oil injection volume correction method comprises the following steps: 1) when the current cylinder is detected, dirty oil flows into the dirty oil drain tank; 2) the metal particle concentration and the pH value of the dirty oil in the dirty oil drain tank are detected, and the detection result is sent to the controller through the data processor, and the controller corrects the oil injection volume of the cylinder oil injector. The application can improve the friction efficiency, reduce the damage of the high metal particle concentration in the oil or the over-acid or over-alkali oil to the mechanical equipment, and reduce the operation cost.

Description

Technical Field

[0001] This invention relates to a correction system and method for diesel engine cylinders, and more particularly to a system and method for detecting and correcting the amount of lubricating oil injected into diesel engine cylinders, belonging to the field of diesel engine monitoring technology. Background Technology

[0002] The cylinder liner and piston ring assembly is a crucial component of a diesel engine, serving as the only friction pair within the combustion chamber. Exposed to high temperature and pressure, as well as damage from incomplete combustion resulting in oil deposits, carbon buildup, and acidic substances, its mechanical wear accounts for 20%–40% of the entire engine's wear. To reduce friction, in addition to optimizing the cylinder liner material and piston coating, lubrication of the cylinder liner and piston rings is essential. Current cylinder lubrication techniques often adjust the lubrication volume based on the cylinder's break-in period. Maintaining a higher lubrication volume reduces wear but leads to significant cylinder oil consumption and increased costs. In practical use, excessively high concentrations of metal abrasive particles or excessively low pH values ​​in the lubricating oil can also cause wear and scratches on the lubricated components, reducing friction efficiency. Monitoring the metal abrasive particle parameters and pH value of the lubricating oil and implementing control and correction schemes based on the results can effectively mitigate these harmful effects. Summary of the Invention

[0003] The purpose of this invention is to provide a diesel engine cylinder lubricating oil injection quantity correction system and method. This system can detect the concentration and size distribution of metal abrasive particles in the cylinder lubricating oil sludge, as well as the pH value of the sludge. Based on the detection results, it determines the mechanical condition and adjusts the lubricating oil injection quantity to reduce cylinder oil consumption while minimizing equipment damage.

[0004] This invention is achieved through the following technical solution:

[0005] A diesel engine cylinder lubricating oil injection quantity correction system includes an oil quantity correction unit, multiple cylinder units arranged in parallel, a main pipeline, branch pipelines, and a sludge detection unit. The oil quantity correction unit includes a data processor, a controller, and a PC terminal, with the data processor and controller connected in parallel to the PC terminal. Each cylinder unit includes a cylinder, an injector, a first solenoid valve, and a three-way valve. The injector is connected to the oil inlet on one side of the cylinder and electrically connected to the controller. The three-way valve is located at the oil outlet of the cylinder chamber and is connected to the oil outlet of the cylinder chamber, the main pipeline, and the branch pipeline. The main pipeline and branch pipelines are arranged parallel to each other below the multiple cylinder units. The solenoid valve is located on one side of the three-way valve. The valve core of the first solenoid valve is fixedly connected to the valve core of the three-way valve. The first solenoid valve is electrically connected to the controller. The sludge and oil detection unit includes a sludge and oil discharge tank, a metal abrasive sensor, a pH meter, a second solenoid valve, and a two-way valve. The branch pipe is connected to the sludge and oil discharge tank. The metal abrasive sensor and the pH meter are fixed on one side of the sludge and oil discharge tank and are electrically connected to the data processor. The two-way valve is located at the oil drain port at the bottom of the other side of the sludge and oil discharge tank. The two-way valve is connected to the oil drain port and the main pipe. The second solenoid valve is located on one side of the two-way valve. The valve core of the second solenoid valve is fixedly connected to the valve core of the two-way valve and is electrically connected to the controller.

[0006] The objectives of this invention can also be further achieved through the following technical measures.

[0007] The aforementioned diesel engine cylinder lubricating oil injection quantity correction system uses an oil-based metal abrasive sensor, specifically the Zhihuochai IFM-3 series metal abrasive sensor, which has ferromagnetic particles ≥30μm and non-ferromagnetic particles ≥150μm.

[0008] The aforementioned diesel engine cylinder lubricating oil filling correction system uses a pH meter as an oil quality sensor, specifically the Zhihuochai IFF-2 series oil quality sensor.

[0009] A method for correcting the lubricating oil injection quantity in a diesel engine cylinder includes the following steps:

[0010] 1) Lubricating oil is injected into the cylinder chamber. After lubrication, the sludge oil passes through the three-way valve. When the current cylinder oil injection amount is not detected, the controller controls the valve core of the corresponding three-way valve through the corresponding first solenoid valve, so that the sludge oil is discharged through the main pipe. When the current cylinder is detected, the controller controls the valve core of the corresponding three-way valve through the corresponding first solenoid valve, so that the sludge oil flows into the sludge oil discharge box through the branch pipe.

[0011] 2) When detecting sludge from the cylinder chamber, first open the two-way valve at the sludge drain tank to flush out the sludge residue in the tank. After flushing, close the two-way valve to allow the sludge to reach a certain level. Then, the metal abrasive sensor and pH meter detect the concentration of metal abrasive particles and the pH value of the sludge in the drain tank, respectively. The detection results are processed by the data processor and sent to the controller. The controller performs PID correction on the oil injection amount of the corresponding cylinder based on the detection results, adjusts the oil injection amount of the cylinder oiler, and determines the current mechanical status. After the detection is completed, open the two-way valve to drain the sludge and wait for the next detection.

[0012] 3) The controller controls the lubricators of all cylinders. The controller controls the opening and closing of the first solenoid valve to correct the lubrication amount of each cylinder in turn. Each time, only the lubrication amount of the lubricator at a single cylinder is corrected. After the lubrication amount of a single cylinder is corrected, the lubrication amount of the next cylinder is corrected, and so on. After the system starts, each cylinder is lubricated according to the standard lubrication amount and waits for the control system to correct. After the current cylinder is corrected, the lubrication amount of the lubricator remains unchanged until the next lubrication amount correction.

[0013] In the aforementioned method for correcting the amount of lubricating oil injected into the diesel engine cylinder, the flushing time of the sludge drain tank in step 2) is 30 minutes, the closing time of the two-way valve is 30 minutes, and the sludge detection lasts for 10 minutes, with multiple detections performed on the sludge.

[0014] The aforementioned method for correcting the amount of lubricating oil injected into the diesel engine cylinder, wherein the method for correcting the amount of oil injected into the cylinder injector in step 2) is as follows: the content of metal abrasive particles in the oil should be less than the set value, and the pH value should be greater than the set value. Based on this standard, when the content of metal abrasive particles in the lubricating oil is too high or the pH value is too low, the difference is used to perform cascade PID parameter positive definiteness on the amount of oil injected, and the amount of oil injected is corrected to adjust the content of metal abrasive particles and the pH value of the lubricating oil.

[0015] The aforementioned method for correcting the amount of lubricating oil injected into the diesel engine cylinder, wherein step 2) is used to determine the current mechanical state as follows: after the metal abrasive sensor detects the abrasive size of the oil, if the abrasive size is 0.5μm to 15μm or even smaller, it is normal sliding abrasive, which is wear caused by normal mechanical sliding; if the abrasive size is greater than 15μm, it is severe sliding abrasive or fatigue spalling, which are abrasives caused by severe mechanical wear or mechanical surface wear fatigue, and the mechanical design needs to be inspected.

[0016] This invention features a simple structure, high efficiency, and ease of maintenance. It employs a metal abrasive sensor and a pH meter to detect the concentration of metal abrasive particles and the pH value in the cylinder lubricating oil. Based on the detection results, the controller adjusts the amount of lubricating oil injected into the cylinder. This not only effectively improves friction efficiency and significantly reduces damage to machinery caused by excessively high concentrations of metal abrasive particles or excessively acidic or alkaline oil, but also minimizes the amount of lubricating oil injected into the cylinder without affecting the condition of the machinery, thus reducing operating costs. Furthermore, this invention can detect the current condition of the machinery through the metal abrasive sensor and perform timely maintenance, extending the service life of the machinery and reducing maintenance costs.

[0017] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] This invention uses a two-stroke diesel engine as an example for illustration.

[0021] like Figure 1 As shown, the present invention includes an oil level correction unit 1, six cylinder units 2 arranged in parallel, a main pipe 3, branch pipes 4, and a sludge detection unit 5. The oil level correction unit 1 includes a data processor 11, a controller 12, and a PC terminal 13. The data processor 11 and the controller 12 are connected in parallel to the PC terminal 13, which provides a visual interface that can display the current oil level and cylinder status. Each cylinder unit 2 includes a cylinder 21, an oil injector 22, a first solenoid valve 23, and a three-way valve 24. The oil injector 22 is connected to the oil inlet 25 at the upper right side of the cylinder 21 and is electrically connected to the controller 12. The three-way valve 24 is located at the oil outlet 26 of the cylinder chamber of the cylinder 21. The three-way valve 24 is connected to the oil outlet 26 of the cylinder chamber, the main pipe 3, and the branch pipe 4, respectively. The main pipe 3 and the branch pipe 4 are arranged in parallel on the lower side of the six cylinder units 2. The first solenoid valve 23 is located on one side of the three-way valve 24. The valve core of the first solenoid valve 23 is fixedly connected to the valve core of the three-way valve 24. The first solenoid valve 23 is electrically connected to the controller 12.

[0022] The oily waste detection unit 5 includes an oily waste discharge tank 51, a metal abrasive sensor 52, a pH meter 53, a second solenoid valve 54, and a two-way valve 55. A branch pipe 4 is connected to the oily waste discharge tank 51. The metal abrasive sensor 52 and pH meter 53 are fixed to the left side of the oily waste discharge tank 51 and are electrically connected to the data processor 11. The two-way valve 55 is located at the oil drain port 56 at the bottom right side of the oily waste discharge tank 51. The two-way valve 55 is connected to both the oil drain port 56 and the main pipe 3. The second solenoid valve 54 is located on one side of the two-way valve 55, and its valve core is fixedly connected to the valve core of the two-way valve 55. The second solenoid valve 54 is electrically connected to the controller 12.

[0023] The metal abrasive sensor 52 is an oil abrasive sensor. The oil abrasive sensor adopts the INZOC IFM-3 series metal abrasive sensor, and its parameters are: ferromagnetic particles ≥30μm, non-ferromagnetic particles ≥150μm, temperature -40~120℃, power supply voltage DC9V~32V, and withstand voltage range max10bar. Interface Specifications: Measurement interface G1 / 4 or 1 / 2” NPT, signal output six-pin aviation connector. Signal Output: RS485 MODBUS RTU (RS232 optional) 4~20mA, resistive load <500Ω (optional). The metal abrasive sensor 52 can realize real-time detection of the concentration and size distribution of metal abrasive particles in oil. The sensor contains a coil that generates a magnetic field when an external alternating current is applied. When metal abrasive particles pass through the sensor, they will cause a change in the magnetoresistance of the sensor, thereby changing the magnetic field in the sensor. The changed magnetic field will generate an induced electromotive force. The magnitude of this electromotive force is related to the size, shape, concentration, and magnetism of the metal abrasive particles. By measuring the electromotive force, the number, size, and distribution of the metal abrasive particles can be determined.

[0024] The pH meter 53 is an oil quality sensor, employing the INZOC IFF-2 series oil quality sensor. Its parameters are: oil quality 0-10, temperature -40-120℃, detecting acid and alkalinity, analog output 4-20mA, power supply voltage DC 9-28V, mechanical interface G1 / 2 ISO or 1 / 2” NPT, signal output: RS485 MODBUS RTU (RS232 optional), six-pin aviation connector. The working principle of the oil quality sensor is to introduce very high-frequency alternating current into the oil sample, precisely measuring the oil's storage capacity and conductivity to reflect changes in oil quality, thereby detecting the oil's acidity or alkalinity.

[0025] The method for correcting the lubricating oil level in a diesel engine cylinder includes the following steps:

[0026] 1) Lubricating oil is injected into the cylinder chamber of cylinder 21. After lubrication, the sludge oil passes through the three-way valve 24. When the current oil injection amount of cylinder 21 is not detected, the controller 12 controls the valve core of the corresponding three-way valve 24 through the corresponding first solenoid valve 23, so that the sludge oil is discharged through the main pipe 3. When the current cylinder 21 is detected, the controller 12 controls the valve core of the corresponding three-way valve 24 through the corresponding first solenoid valve 23, so that the sludge oil flows into the sludge oil discharge box 51 through the branch pipe 4.

[0027] 2) When detecting sludge from cylinder chamber 21, first open the two-way valve 55 at the sludge drain tank 51 to flush away any remaining sludge in the tank, preventing previous detections from affecting the current results. The flushing time is 30 minutes. After flushing, close the two-way valve 55 for 30 minutes to allow the sludge to accumulate to a certain level. Then, the metal abrasive sensor 52 and pH meter 53 detect the metal abrasive concentration and pH value of the sludge in the drain tank 51, respectively. Each test lasts 10 minutes, and multiple tests are performed to ensure the results match the actual values. The test results are processed by the data processor 11 and sent to the controller 12. The controller 12 uses PID control to adjust the oil injection amount of the corresponding cylinder 21 based on the test results, correcting the oil injection amount of the cylinder injector and determining the current mechanical state. After the sludge detection is complete, open the two-way valve 55 to drain the sludge, awaiting the next test. PID is a proportional-integral-derivative controller.

[0028] The method for correcting the oil injection amount of the oil injector 22 of cylinder 21 is as follows: the content of metal abrasive particles in the oil should be less than the set value, and the pH value should be greater than the set value. Based on this standard, when the content of metal abrasive particles in the lubricating oil is too high or the pH value is too low, the difference is used to perform cascade PID parameter positive definiteness on the oil injection amount to correct the oil injection amount and adjust the content of metal abrasive particles and the pH value of the lubricating oil.

[0029] Determining the current mechanical condition: After the metal abrasive sensor 52 detects the abrasive particle size in the oil, if the abrasive particle size is 0.5μm to 15μm or even smaller, it is considered normal sliding abrasive, which is wear caused by normal mechanical sliding. Abrasive particles larger than 15μm are considered severe sliding abrasive or fatigue spalling. These two types of abrasive particles are caused by severe mechanical wear or fatigue wear on the mechanical surface, and the mechanical design needs to be inspected and repaired.

[0030] 3) The controller 12 controls the lubricators 22 of all cylinders 21. The controller 12 controls the opening and closing of the three-way valve 24 by controlling the opening and closing of the first solenoid valve 23, thereby controlling the flow direction of the sludge. The controller 12 corrects the lubrication amount of each cylinder 21 sequentially by controlling the opening and closing of the first solenoid valve 23. Each time, only the lubrication amount of the lubricator 22 at a single cylinder is corrected. After the lubrication amount of a single cylinder is corrected, the lubrication amount of the next cylinder is corrected, and so on in a cycle. After the system starts, each cylinder 21 is lubricated according to the standard lubrication amount and waits for the control system to correct it. After the current cylinder 21 is corrected, the lubrication amount of the lubricator 22 remains unchanged until the next lubrication amount correction.

[0031] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A diesel engine cylinder lubricating oil injection quantity correction system, characterized in that: The system includes an oil level correction unit, multiple cylinder units connected in parallel, a main pipeline, branch pipelines, and a sludge detection unit. The oil level correction unit includes a data processor, a controller, and a PC terminal, with the data processor and controller connected in parallel to the PC terminal. Each cylinder unit includes a cylinder, an oil injector, a first solenoid valve, and a three-way valve. The oil injector is connected to the oil inlet on one side of the cylinder and is electrically connected to the controller. The three-way valve is located at the oil outlet of the cylinder chamber and is connected to the oil outlet of the cylinder chamber, the main pipeline, and the branch pipeline. The main pipeline and branch pipelines are arranged parallel to each other below the multiple cylinder units. The first solenoid valve is located on one side of the three-way valve. The valve core of the first solenoid valve is fixedly connected to the valve core of the three-way valve, and the first solenoid valve is electrically connected to the controller; the sludge detection unit includes a sludge discharge tank, a metal abrasive sensor, a pH meter, a second solenoid valve, and a two-way valve. The branch pipe is connected to the sludge discharge tank. The metal abrasive sensor and the pH meter are fixed on one side of the sludge discharge tank and are electrically connected to the data processor respectively. The two-way valve is located at the oil drain port at the bottom of the other side of the sludge discharge tank. The two-way valve is connected to the oil drain port and the main pipe respectively. The second solenoid valve is located on one side of the two-way valve. The valve core of the second solenoid valve is fixedly connected to the valve core of the two-way valve, and the second solenoid valve is electrically connected to the controller.

2. The diesel engine cylinder lubricating oil injection quantity correction system as described in claim 1, characterized in that: The metal abrasive sensor is an oil-based metal abrasive sensor.

3. The diesel engine cylinder lubricating oil injection quantity correction system as described in claim 1, characterized in that: The pH meter is an oil quality sensor.

4. A correction method for a diesel engine cylinder lubricating oil injection quantity correction system according to claim 1, characterized in that, Includes the following steps: 1) Lubricating oil is injected into the cylinder chamber. After lubrication, the sludge oil passes through the three-way valve. When the current cylinder oil injection amount is not detected, the controller controls the valve core of the corresponding three-way valve through the corresponding first solenoid valve, so that the sludge oil is discharged through the main pipe. When the current cylinder is detected, the controller controls the valve core of the corresponding three-way valve through the corresponding first solenoid valve, so that the sludge oil flows into the sludge oil drain box through the branch pipe. 2) When detecting sludge from the cylinder chamber, first open the two-way valve at the sludge drain tank to flush out the sludge residue in the tank. After flushing, close the two-way valve to allow the sludge to reach a certain level. Then, the metal abrasive sensor and pH meter detect the concentration of metal abrasive particles and the pH value of the sludge in the drain tank, respectively. The detection results are processed by the data processor and sent to the controller. The controller performs PID correction on the oil injection amount of the corresponding cylinder based on the detection results, adjusts the oil injection amount of the cylinder oiler, and determines the current mechanical status. After the detection is completed, open the two-way valve to drain the sludge and wait for the next detection. 3) The controller controls the lubricators of all cylinders. The controller controls the opening and closing of the first solenoid valve to correct the lubrication amount of each cylinder in turn. At one time, only the lubrication amount of the lubricator at a single cylinder is corrected. After the lubrication amount of a single cylinder is corrected, the lubrication amount of the next cylinder is corrected, and so on. After the system starts, each cylinder is lubricated according to the standard lubrication amount and waits for the control system to correct. After the current cylinder is corrected, the lubrication amount of the lubricator remains unchanged until the next lubrication amount correction.

5. The method for correcting the lubricating oil injection quantity of a diesel engine cylinder as described in claim 4, characterized in that: In step 2), the flushing time of the sludge and oil discharge tank is 30 minutes, and the closing time of the two-way valve is 30 minutes; the sludge and oil detection lasts for 10 minutes, and the sludge and oil are detected multiple times.

6. The method for correcting the amount of lubricating oil injected into a diesel engine cylinder as described in claim 4, characterized in that: In step 2), the method for correcting the oil injection amount of the cylinder oiler is as follows: the content of metal abrasive particles in the oil should be less than the set value, and the pH value should be greater than the set value. Based on this standard, when the content of metal abrasive particles in the lubricating oil is too high or the pH value is too low, the difference is used to perform cascade PID parameter positive definiteness on the oil injection amount to correct the oil injection amount and adjust the content of metal abrasive particles and the pH value of the lubricating oil.

7. The method for correcting the amount of lubricating oil injected into a diesel engine cylinder as described in claim 4, characterized in that: The method for determining the current mechanical state in step 2) is as follows: After the metal abrasive sensor detects the abrasive size of the oil, if the abrasive size is 0.5μm to 15μm or even smaller, it is normal sliding abrasive, which is wear caused by normal sliding of the machine; if the abrasive size is above 15μm, it is severe sliding abrasive or fatigue spalling. These two types of abrasive are caused by severe wear of the machine or wear fatigue on the surface of the machine. At this time, the mechanical design needs to be inspected and repaired.

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