Diesel filtering monitoring device and method for diesel engine

Abstract

A diesel filtering monitoring method and device for a diesel engine. The method comprises: acquiring an oil intake pressure at an oil intake connector of a diesel filter and an oil output pressure at an oil output connector of the diesel filter; on the basis of the oil intake pressure and the oil output pressure, calculating an oil intake and output pressure difference; comparing the oil intake and output pressure difference with a preset pressure difference early-warning value; if the oil intake and output pressure difference is greater than or equal to the pressure difference early-warning value, generating filter element alarm information, and giving an alarm prompt for replacing the diesel filter; acquiring a diesel oil quality detection value at the oil output connector; comparing the diesel oil quality detection value with a preset early-warning oil quality value; and if the diesel oil quality detection value is less than the early-warning oil quality value, generating information indicating that the diesel oil quality is not up to standard.

Description

A diesel engine diesel filter monitoring device and method Technical Field

[0001] This invention relates to diesel engines, and more specifically, to a diesel engine diesel filter monitoring device and method. Background Technology

[0002] The diesel fuel filter system of a diesel engine has two main functional indicators: first, to ensure that the filtered diesel fuel flow rate meets the combustion requirements of the diesel engine; and second, to ensure that the filtered diesel fuel meets the requirements of fuel injector injection and clean combustion in the diesel engine. Traditional diesel filters generally do not have a diesel filter monitoring system and are replaced periodically according to the usage cycle; or they are only equipped with pressure gauges before and after the filter, and the filter element needs to be replaced by reading the pressure difference before and after the filter.

[0003] Traditional diesel fuel filtration methods have the following problems:

[0004] 1. For systems without monitoring: filter elements can only be replaced based on fixed usage intervals estimated from general experience. Since diesel engine load, fuel consumption, and fuel type vary at different times, this can lead to wasted filter life, increased maintenance costs, or delayed maintenance resulting in untimely fuel supply, reduced diesel engine power, or unresponsive engine conditions.

[0005] 2. Engines equipped with front and rear pressure gauges require manual inspection and reading comparison, which is inconvenient. They can only monitor whether the flow rate meets the requirement for filter replacement, but cannot monitor the quality of the filtered fuel, such as filter damage. Even if the flow rate is sufficient, if the fuel quality is insufficient, unclean diesel fuel will flow into the combustion chamber, causing wear and blockage of precision components, reducing the service life of the diesel engine, and even directly causing malfunctions such as component seizure or engine runaway. Furthermore, the combustion of unclean fuel will also cause combustion degradation, carbon buildup, and other problems, resulting in non-compliant emissions and accelerated wear of cylinder liners and pistons. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a diesel engine diesel filter monitoring device and method to address the shortcomings of the prior art.

[0007] The present invention discloses a diesel engine diesel filter monitoring method, which acquires the inlet pressure at the inlet connector and the outlet pressure at the outlet connector of the diesel filter, calculates the inlet-outlet pressure difference based on the inlet and outlet pressures, compares the inlet-outlet pressure difference with a preset pressure difference warning value, and if the inlet-outlet pressure difference is greater than or equal to the pressure difference warning value, generates a filter element alarm message to prompt the replacement of the diesel filter; acquires the diesel fuel quality detection value at the outlet connector and compares the diesel fuel quality detection value with a preset warning fuel quality value, and if the diesel fuel quality detection value is less than the warning fuel quality value, generates a diesel fuel quality non-conforming information.

[0008] Preferably, when the inlet and outlet oil pressure difference is less than the pressure difference warning value and the diesel fuel detection value is less than the warning value, the current detection cycle is taken as the cycle in which the inlet and outlet oil pressure difference occurs. The inlet and outlet oil pressure differences of the previous N detection cycles are obtained. The difference between the inlet and outlet oil pressure differences of the previous N detection cycles and the inlet and outlet oil pressure difference of the current cycle is calculated to obtain N pressure difference values. It is then checked whether there is a sudden pressure difference value among the N pressure difference values. If there is, it is determined that the diesel filter is damaged, and a diesel filter damage alarm message is generated. Here, N is a natural number greater than or equal to 3.

[0009] Preferably, the method for determining the sudden pressure difference value is as follows: among the N pressure difference values, after removing the largest and smallest pressure difference values, the remaining pressure difference values ​​are averaged to obtain the average difference value; the pressure difference values ​​that are outside the percentage range set by the average difference value are taken as the sudden pressure difference value.

[0010] Preferably, M sampling periods are set, and within each sampling period, an inlet-outlet oil pressure difference is randomly collected as a pressure difference sample and a diesel fuel quality detection value is collected as a detection sample. It is determined whether each detection sample is greater than or equal to the warning fuel quality value. If each detection sample is greater than or equal to the warning fuel quality value, the pressure difference samples are sorted according to the time sequence of the sampling periods to obtain a pressure difference sequence. The sorting of the pressure difference sequence is determined according to the filtration rule of the diesel filter. If it is not normal, a warning message of unqualified diesel fuel quality is generated. Wherein, M is a natural number greater than 3.

[0011] Preferably, the filtration rule of the diesel filter is that each pressure difference sample in the pressure difference sequence is equal.

[0012] Preferably, the filtration pattern of the diesel filter is as follows: each differential pressure sample in the differential pressure sequence decreases sequentially, and the decreasing value is within a set threshold range.

[0013] Preferably, the sampling period is longer than the detection period.

[0014] A diesel engine diesel filter monitoring device includes an inlet pressure sensor, an outlet pressure sensor, a diesel fuel quality sensor, and a monitor. The inlet pressure sensor is installed at the inlet connector of the diesel filter, and the outlet pressure sensor and the diesel fuel quality sensor are both installed at the outlet connector of the diesel filter. The inlet pressure sensor, the outlet pressure sensor, and the diesel fuel quality sensor are all electrically connected to the monitor via a wiring harness. The monitor uses the described diesel engine diesel filter monitoring method to monitor the operating condition of the diesel filter. Beneficial effects

[0015] The advantages of this invention are as follows: Based on the pressure difference comparison before and after diesel fuel filtration and the test results of the filtered fuel, it automatically prompts for filter element replacement, reducing maintenance costs. It also effectively prevents the filter element from expiring and serves as a reminder to the driver to provide reliable quality fuel for the diesel engine. Furthermore, by utilizing both fuel quality and pressure difference indicators, it effectively protects fuel system equipment downstream of the filter, such as the fuel injection pump and nozzles, reducing the failure rate of fuel system components. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the diesel engine diesel filter monitoring device of the present invention.

[0017] Among them: 1-Diesel filter, 2-Inlet pressure sensor, 3-Outlet pressure sensor, 4-Diesel fuel sensor. Detailed Implementation

[0018] 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.

[0019] This invention discloses a diesel engine diesel filter monitoring method. It acquires the inlet pressure at the diesel filter inlet connector and the outlet pressure at the outlet connector. Based on these pressures, it calculates the inlet-outlet pressure difference and compares it to a preset pressure difference warning value. If the pressure difference is greater than or equal to the warning value, it indicates a blockage in the diesel filter inlet, triggering a filter element alarm to prompt replacement. The method also acquires the diesel fuel quality reading at the outlet connector and compares it to a preset warning value. If the reading is less than the warning value, it indicates insufficient purity of the diesel fuel currently used in the engine, generating a diesel fuel quality defect information message to remind the driver to replace it with qualified diesel fuel as soon as possible. Through this design, the method achieves real-time automatic monitoring of the pressure difference across the diesel filter and the quality of the filtered fuel, automatically prompting for filter element replacement.

[0020] Considering that when a diesel fuel filter is damaged, impurities filtered out in the earlier stages will flow out with the diesel fuel, affecting its quality and potentially leading to misjudgments, this embodiment addresses this issue. When the inlet and outlet pressure difference is less than the pressure difference warning value, and the diesel fuel quality detection value is less than the warning value (i.e., the pressure difference in the current detection cycle is normal but the diesel fuel quality detection result is abnormal), the cycle containing the inlet and outlet pressure difference is used as the current detection cycle. The inlet and outlet pressure differences of the previous N detection cycles are then obtained. The differences between the inlet and outlet pressure differences of the previous N detection cycles and the current cycle are calculated to obtain N pressure difference values. The system checks for any sudden changes in pressure difference values ​​among these N values. If such a change exists, the diesel fuel filter is determined to be damaged, and a diesel fuel filter damage alarm is generated. When a diesel fuel filter is working normally, the pressure difference between the inlet and outlet should decrease linearly due to the filter-out impurities. However, when the diesel fuel filter is damaged, especially when the filtration function is impaired, the impurities that were previously filtered out will be released into the diesel fuel in a short period of time. At the same time, the pressure difference between the inlet and outlet will also change significantly, generally by a sudden decrease. Therefore, this invention cleverly utilizes the phenomenon of sudden pressure difference when the diesel fuel filter is damaged, so as to accurately determine whether the abnormal diesel fuel test result is caused by the damage to the diesel fuel filter, thus greatly improving the accuracy of diesel fuel filter monitoring.

[0021] In this embodiment, the method for determining the sudden pressure difference is as follows: Among N pressure difference values, the largest and smallest pressure difference values ​​are removed, and the remaining pressure difference values ​​are averaged to obtain the mean difference. Pressure difference values ​​outside a predetermined percentage range of the mean difference are used as the sudden pressure difference values. Discarding the maximum and minimum values ​​below the mean allows for more accurate identification of sudden pressure difference values.

[0022] To address diesel fuel quality concerns, this invention also includes an early warning mechanism. Specifically, M sampling cycles are set. Within each sampling cycle, a pressure difference between the inlet and outlet is randomly collected as a pressure difference sample, and a diesel fuel quality test value is collected as a test sample. It is determined whether each test sample is greater than or equal to the early warning value. If each test sample is greater than or equal to the early warning value, the pressure difference samples are sorted according to the chronological order of the sampling cycles to obtain a pressure difference sequence. The sorting of the pressure difference sequence is then judged based on the filtration pattern of the diesel filter. If it is abnormal, an early warning message indicating that the diesel fuel is substandard is generated. In other words, even assuming the diesel fuel is of normal quality, monitoring the normality of the sorting between the pressure difference sequences can effectively determine whether the currently used diesel fuel is pure. In a differential pressure sequence, if each differential pressure sample is equal, or if each sample decreases sequentially within a set threshold, the sequence is considered normal and the diesel fuel is relatively pure. However, if a sample decreases sequentially but the decrease exceeds a set threshold, the diesel fuel is considered to contain many impurities and is of poor quality. In this case, a notification will be generated to remind the driver to use qualified diesel fuel. This design helps drivers monitor the source of different fuels.

[0023] In this embodiment, the sampling period needs to be much longer than the detection period to ensure the reliability of diesel monitoring, while also avoiding the early warning mechanism from consuming too much CPU resources due to an excessively short sampling period.

[0024] Referring to Figure 1, the present invention also provides a diesel engine diesel filter monitoring device, including an inlet pressure sensor 2, an outlet pressure sensor 3, a diesel fuel quality sensor 4, and a monitor 5. The inlet pressure sensor 2 is installed at the inlet connector of the diesel filter 1, and the outlet pressure sensor 3 and the diesel fuel quality sensor 4 are both installed at the outlet connector of the diesel filter 1. The inlet pressure sensor 2, the outlet pressure sensor 3, and the diesel fuel quality sensor 4 are simultaneously electrically connected to the monitor 5 via a wiring harness. The monitor 5 uses the above-mentioned diesel engine diesel filter monitoring method to monitor the operating condition of the diesel filter, thereby achieving the purpose of real-time automatic monitoring of the pressure difference before and after the diesel filter, the quality of the filtered fuel, and automatically prompting the filter element to be replaced.

[0025] 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 monitoring diesel fuel filtration in a diesel engine, characterized by, The system acquires the inlet pressure at the diesel filter inlet connector and the outlet pressure at the outlet connector. Based on these pressures, it calculates the inlet-outlet pressure difference and compares it with a preset pressure difference warning value. If the pressure difference is greater than or equal to the warning value, a filter element alarm is generated, prompting the replacement of the diesel filter. The system also acquires the diesel fuel quality test value at the outlet connector and compares it with a preset warning value. If the test value is less than the warning value, a diesel fuel quality non-compliance information is generated.

2. The method of claim 1, wherein the method further comprises: When the inlet and outlet oil pressure difference is less than the pressure difference warning value, and the diesel fuel detection value is less than the warning value, the current detection cycle is taken as the cycle in which the inlet and outlet oil pressure difference occurs. The inlet and outlet oil pressure differences of the previous N detection cycles are obtained. The difference between the inlet and outlet oil pressure differences of the previous N detection cycles and the inlet and outlet oil pressure difference of the current cycle is calculated to obtain N pressure difference values. It is then checked whether there is a sudden pressure difference value among the N pressure difference values. If there is, it is determined that the diesel filter is damaged, and a diesel filter damage alarm message is generated. Here, N is a natural number greater than 3.

3. The diesel engine diesel filter monitoring method according to claim 2, characterized in that, The method for determining the sudden pressure difference value is as follows: among the N pressure difference values, after removing the largest and smallest pressure difference values, the remaining pressure difference values ​​are averaged to obtain the average difference value; the pressure difference value that is outside the percentage range set by the average difference value is taken as the sudden pressure difference value.

4. The diesel engine diesel filter monitoring method according to claim 2, characterized in that, M sampling periods are set. In each sampling period, an inlet-outlet oil pressure difference is randomly collected as a pressure difference sample and a diesel fuel quality test value is collected as a test sample. It is determined whether each test sample is greater than or equal to the warning fuel quality value. If each test sample is greater than or equal to the warning fuel quality value, the pressure difference samples are sorted according to the time sequence of the sampling periods to obtain a pressure difference sequence. The sorting of the pressure difference sequence is judged according to the filtration law of the diesel filter. If it is not normal, a warning message of diesel fuel quality failure is generated. Wherein, M is a natural number greater than 3.

5. A method for monitoring diesel fuel filter cleanliness in a diesel engine according to claim 4, characterized in that, The filtration principle of the diesel filter is that each pressure difference sample in the pressure difference sequence is equal.

6. The diesel engine diesel filter monitoring method according to claim 4, characterized in that, The filtration principle of the diesel filter is as follows: each pressure difference sample in the pressure difference sequence decreases sequentially, and the decrease value is within a set threshold range.

7. The method of claim 4, wherein the step of determining the amount of fuel remaining in the filter includes the step of: The sampling period is longer than the detection period. ​ 8. A diesel filter monitoring device for a diesel engine, characterized by The system includes an inlet pressure sensor (2), an outlet pressure sensor (3), a diesel fuel sensor (4), and a monitor (5). The inlet pressure sensor (2) is installed at the inlet port of the diesel filter (1), and the outlet pressure sensor (3) and the diesel fuel sensor (4) are both installed at the outlet port of the diesel filter (1). The inlet pressure sensor (2), the outlet pressure sensor (3), and the diesel fuel sensor (4) are electrically connected to the monitor (5) simultaneously via a wiring harness. The monitor (5) uses the diesel engine diesel filter monitoring method as described in any one of claims 1-7 to monitor the operating condition of the diesel filter.

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