A diesel engine diesel filter monitoring device and method

Abstract

The application discloses a diesel engine diesel filter monitoring method, relates to a diesel engine, obtains an oil inlet pressure at an oil inlet joint of a diesel filter and an oil outlet pressure at an oil outlet joint, calculates an oil inlet and outlet pressure difference according to the oil inlet pressure and the oil outlet pressure, compares the oil inlet and outlet pressure difference with a preset pressure difference early warning value, and if the oil inlet and outlet pressure difference is greater than or equal to the pressure difference early warning value, filter element alarm information is generated to produce an alarm prompt for replacing the diesel filter; a diesel oil product detection value of the oil outlet joint is obtained, and the diesel oil product detection value is compared with a preset early warning oil product value; if the diesel oil product detection value is less than the early warning oil product value, diesel oil product unqualified information is generated. The application further discloses a diesel engine diesel filter monitoring device. The application realizes automatic replacement of the filter element, reduces maintenance cost, and can well control the filter element from being overdue for maintenance, thereby reducing a fuel equipment failure rate.

Description

TECHNICAL FIELD

[0001] The present application relates to a diesel engine, more particularly, it relates to a diesel filter monitoring device and method. BACKGROUND

[0002] The diesel filter system of a diesel engine has two main function indicators, one is to ensure that the filtered diesel flow meets the diesel engine combustion demand, and the other is to ensure that the filtered diesel oil meets the injector injection and diesel engine clean combustion demand. The traditional diesel filter generally has no diesel filter monitoring system, and is replaced regularly according to the use cycle; or only pressure display tables are installed in front and back, and whether the diesel filter is blocked is judged by reading the pressure difference before and after, so as to judge whether the filter element needs to be replaced.

[0003] The traditional diesel filter method has the following problems:

[0004] 1. Without monitoring system: only the fixed use time of filter element can be replaced according to general experience. Because the diesel engine load is different in each time period, the oil consumption is also different, and the oil used may also be different, there is waste of filter element life, which causes the use and maintenance cost to rise, or the oil supply is not timely due to overdue maintenance, the diesel engine power is reduced or the diesel engine working condition is not timely, and the problem of the diesel engine is not timely.

[0005] 2. With front and back pressure display tables, manual inspection and reading comparison are required, which is inconvenient, and only whether the flow meets the requirement of replacing the filter element can be monitored, and problems of the filtered oil, such as filter element damage, cannot be monitored. Although the flow meets the requirement, the oil does not meet the requirement, which leads to unclean diesel flowing into combustion, causing wear and tear of precision parts, blockage, reducing the service life of the diesel engine, and even directly causing major hazards such as part jamming, diesel engine flying, and other major hazards. At the same time, the oil that does not meet the cleanliness requirement when burned also causes combustion deterioration, carbon deposition, emission failure, and accelerated wear of cylinder sleeve and piston. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a diesel filter monitoring device and method for the deficiencies of the prior art.

[0007] The diesel engine diesel filter monitoring method provided by the application obtains the oil inlet pressure at the oil inlet joint of the diesel filter and the oil outlet pressure at the oil outlet joint, calculates the oil inlet-outlet pressure difference based on the oil inlet pressure and the oil outlet pressure, compares the oil inlet-outlet pressure difference with a preset pressure difference warning value, and if the oil inlet-outlet pressure difference is greater than or equal to the pressure difference warning value, generates filter element alarm information to replace the diesel filter and generate an alarm prompt; the diesel oil detection value at the oil outlet joint is obtained, and the diesel oil detection value is compared with a preset warning oil value, and if the diesel oil detection value is less than the warning oil value, generates diesel oil unqualified information.

[0008] Preferably, when the oil inlet-outlet pressure difference is less than the pressure difference warning value and the diesel oil detection value is less than the warning oil value, the period in which the oil inlet-outlet pressure difference is located is taken as a current detection period, the oil inlet-outlet pressure differences of the previous N detection periods before the current detection period are obtained, the oil inlet-outlet pressure differences of the previous N detection periods are each subjected to a difference value operation with the oil inlet-outlet pressure difference of the current period to obtain N pressure difference difference values, and it is determined that the diesel filter is damaged and diesel filter damage alarm information is generated if there is a sudden pressure difference difference value in the N pressure difference difference values; wherein N is a natural number greater than or equal to 3.

[0009] Preferably, the determination method of the sudden pressure difference difference value is that, after the largest pressure difference difference value and the smallest pressure difference difference value are removed from the N pressure difference difference values, the remaining pressure difference difference values are subjected to an average value operation to obtain a difference value average, and a pressure difference difference value located outside a percentage range of the difference value average is taken as a sudden pressure difference difference value.

[0010] Preferably, M sampling periods are set, an oil inlet-outlet pressure difference is randomly collected as a pressure difference sample and a diesel oil detection value is randomly collected as a detection sample in each sampling period, it is determined whether each detection sample is greater than or equal to a warning oil value, if each detection sample is greater than or equal to the warning oil value, the pressure difference samples are sorted according to the time sequence of the sampling periods to obtain a pressure difference sequence, and it is determined whether the sorting of the pressure difference sequence is normal according to the filtering rule of the diesel filter, and if not, warning information of unqualified diesel oil is generated; wherein M is a natural number greater than or equal to 3.

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

[0012] Preferably, the filtering rule of the diesel filter is that each pressure difference sample in the pressure difference sequence is sequentially decreased, and the decreasing value is within a set threshold range.

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

[0014] The diesel engine diesel filter monitoring device comprises an oil inlet pressure sensor, an oil outlet pressure sensor, a diesel oil sensor and a monitor, the oil inlet pressure sensor is installed at an oil inlet joint of the diesel filter, the oil outlet pressure sensor and the diesel oil sensor are both installed at an oil outlet joint of the diesel filter, the oil inlet pressure sensor, the oil outlet pressure sensor and the diesel oil sensor are electrically connected with the monitor through a wire harness, and the monitor applies the diesel engine diesel filter monitoring method to monitor the working condition of the diesel filter.

[0015] Beneficial effects

[0016] The diesel engine diesel filter monitoring device has the advantages that according to the pressure difference comparison before and after the diesel filter and the oil detection result after the filtration, automatic replacement of the filter element is realized, the maintenance cost is reduced, the filter element can be well controlled to be not expired and maintained, the driver is reminded to provide reliable oil for the diesel engine to burn, in addition, through the double reminders of the oil and the pressure difference, the fuel system equipment, such as the fuel injection pump and the nozzle, at the rear end of the filter can be effectively protected, and the failure rate of the fuel equipment is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The diesel engine diesel filter monitoring device is schematically shown.

[0018] 1, diesel filter; 2, oil inlet pressure sensor; 3, oil outlet pressure sensor; 4, diesel oil sensor. DETAILED DESCRIPTION

[0019] The diesel engine diesel filter monitoring device is schematically shown.

[0020] The diesel engine diesel filter monitoring method comprises the following steps: obtaining the oil inlet pressure at an oil inlet joint of a diesel filter and the oil outlet pressure at an oil outlet joint, calculating the oil inlet-outlet pressure difference according to the oil inlet pressure and the oil outlet pressure, comparing the oil inlet-outlet pressure difference with a preset pressure difference warning value, if the oil inlet-outlet pressure difference is greater than or equal to the pressure difference warning value, it is indicated that the oil inlet of the diesel filter is blocked, at this time, filter element alarm information is generated to replace the diesel filter and give an alarm. The diesel oil detection value of the oil outlet joint is obtained, and the diesel oil detection value is compared with a preset warning oil value, if the diesel oil detection value is less than the warning oil value, it is indicated that the purity of the diesel currently used by the diesel engine is insufficient, diesel oil unqualified information is generated to remind the driver to replace qualified diesel as soon as possible. Through the above design, the real-time automatic monitoring of the pressure difference before and after the diesel filter, the quality of the filtered oil and the automatic replacement of the filter element are realized.

[0021] In view of the fact that when the diesel filter is damaged, the impurities filtered out in the early stage will flow out with the diesel oil, affecting the quality of the diesel oil and leading to misjudgment. To solve this problem, in the embodiment, when the oil inlet and outlet pressure difference is less than the pressure difference warning value, and the diesel oil detection value is less than the warning oil value, that is, the pressure difference in the current detection period is normal but the diesel oil detection result is abnormal, the period in which the oil inlet and outlet pressure difference is located is taken as the current detection period, and the oil inlet and outlet pressure differences in the N detection periods before the current detection period are obtained. Then, the oil inlet and outlet pressure differences in the N detection periods are subtracted from the oil inlet and outlet pressure difference in the current period one by one to obtain N pressure difference differences. It is determined whether there is a sudden pressure difference difference in the N pressure difference differences, and if so, it is determined that the diesel filter is damaged, and a diesel filter damage warning information is generated. When the diesel filter is working normally, due to the influence of the filtered impurities, the oil inlet and outlet pressure difference should decrease linearly, but when the diesel filter is damaged, especially when the filtering function is damaged, the impurities filtered out in the early stage will be released into the diesel oil in a short time, and the oil inlet and outlet pressure difference will also change obviously, generally suddenly decreasing. Therefore, the present application ingeniously uses the phenomenon that the pressure difference suddenly changes when the diesel filter is damaged, so as to accurately determine whether the current diesel oil detection result is abnormal due to the damage of the diesel filter, greatly improving the accuracy of monitoring the diesel filter.

[0022] In the embodiment, the determination method of the sudden pressure difference difference is as follows: among the N pressure difference differences, the maximum pressure difference difference and the minimum pressure difference difference are removed, and the remaining pressure difference differences are subjected to mean value operation to obtain a difference value mean; and the pressure difference difference located outside the set percentage range of the difference value mean is taken as the sudden pressure difference difference. Removing the maximum value and the minimum value from the mean value can more accurately find the sudden pressure difference difference.

[0023] For the quality of diesel oil, the application also designs a warning mechanism. Specifically, M sampling periods are set, and in each sampling period, a pressure difference between the inlet and outlet of oil is randomly collected as a pressure difference sample, and a diesel oil detection value is collected as a detection sample. It is judged whether each detection sample is greater than or equal to a warning oil value. If each detection sample is greater than or equal to the warning oil value, the pressure difference samples are sorted according to the time sequence of the sampling periods to obtain a pressure difference sequence. It is judged whether the sorting of the pressure difference sequence is normal according to the filtering rule of the diesel filter. If it is not normal, a warning information of unqualified diesel oil is generated. That is, under the premise that the diesel oil is normal, the sorting normality between the pressure difference sequences is monitored, and it can also be effectively judged whether the current diesel oil used is pure. That is, in the pressure difference sequence, if each pressure difference sample in the pressure difference sequence is equal, or each pressure difference sample in the pressure difference sequence is sequentially decreased, and the decreased value is within a set threshold range, it is considered that the sorting of the pressure difference sequence is normal, and the diesel oil can also be relatively pure. But if each pressure difference sample in the pressure difference sequence is sequentially decreased, but the decreased value exceeds the set threshold range, it is considered that there are many impurities in the diesel oil, and the diesel oil is not good, at which time the corresponding information can remind the driver to add qualified diesel oil. The design is helpful for the driver to monitor different oil sources.

[0024] In the embodiment, the sampling period needs to be much larger than the detection period, to ensure the reliability of diesel monitoring, and also avoid that the sampling period is too short to cause the warning mechanism to occupy too much CPU resource.

[0025] Referring to Figure 1 The application also provides a diesel engine diesel filter monitoring device, which comprises an inlet oil pressure sensor 2, an outlet oil pressure sensor 3, a diesel oil sensor 4 and a monitor 5. The inlet oil pressure sensor 2 is installed at the inlet joint of the diesel filter 1, the outlet oil pressure sensor 3 and the diesel oil sensor 4 are both installed at the outlet joint of the diesel filter 1, and the inlet oil pressure sensor 2, the outlet oil pressure sensor 3 and the diesel oil sensor 4 are electrically connected to the monitor 5 through a wire harness. The monitor 5 applies the diesel engine diesel filter monitoring method to monitor the working condition of the diesel filter, so as to achieve the purpose of automatically monitoring the pressure difference before and after the diesel filter, the quality of the filtered oil, and automatically prompting the replacement of the filter element.

[0026] The above is only the preferred embodiment of the application, and it should be pointed out that for those skilled in the art, without departing from the structure of the application, a number of modifications and improvements can be made, which will not affect the effect of the implementation of the application and the practicality of the patent.

Claims

1. A method of monitoring diesel fuel filtration in a diesel engine, characterized by, The method comprises the following steps: acquiring the inlet oil pressure at the inlet joint of the diesel filter and the outlet oil pressure at the outlet joint of the diesel filter; calculating the inlet-outlet oil pressure difference according to the inlet oil pressure and the outlet oil pressure; comparing the inlet-outlet oil pressure difference with a preset pressure difference warning value; if the inlet-outlet oil pressure difference is greater than or equal to the pressure difference warning value, generating filter element alarm information to alarm and prompt the replacement of the diesel filter; acquiring the diesel oil product detection value at the outlet joint, and comparing the diesel oil product detection value with a preset warning oil product value; if the diesel oil product detection value is less than the warning oil product value, generating diesel oil product unqualified information. When the inlet-outlet oil pressure difference is less than the pressure difference warning value and the diesel oil product detection value is less than the warning oil product value, the period in which the inlet-outlet oil pressure difference is located is taken as the current detection period, the inlet-outlet oil pressure differences of the previous N detection periods are acquired, the inlet-outlet oil pressure differences of the previous N detection periods are subjected to difference value operation with the inlet-outlet oil pressure difference of the current period one by one, and N pressure difference difference values are obtained; it is determined whether there is a sudden pressure difference difference value in the N pressure difference difference values; if there is, it is determined that the diesel filter is damaged, and diesel filter damage alarm information is generated; wherein N is a natural number greater than or equal to 3.

2. The method of claim 1, wherein the method further comprises: The method for determining the sudden pressure difference difference value is as follows: among the N pressure difference difference values, the maximum pressure difference difference value and the minimum pressure difference difference value are removed, and the remaining pressure difference difference values are subjected to mean value operation to obtain a difference value mean; a pressure difference difference value located outside a percentage range of the difference value mean is taken as a sudden pressure difference difference value.

3. The method of claim 1, wherein the step of monitoring the filter comprises the step of: M sampling periods are set, an inlet-outlet oil pressure difference is randomly collected as a pressure difference sample and a diesel oil product detection value is randomly collected as a detection sample in each sampling period; it is determined whether each detection sample is greater than or equal to a warning oil product value; if each detection sample is greater than or equal to the warning oil product value, the pressure difference samples are sorted according to the time sequence of the sampling periods to obtain a pressure difference sequence, and it is determined whether the sorting of the pressure difference sequence is normal according to the filtering rule of the diesel filter; if not, warning information of unqualified diesel oil product is generated; wherein M is a natural number greater than or equal to 3. ​ 4. The method of claim 3, wherein the step of determining the amount of fuel remaining in the filter includes the step of: The filtering rule of the diesel filter is that each pressure difference sample in the pressure difference sequence is equal. ​ 5. The method of claim 3, wherein the step of determining the amount of fuel remaining in the filter includes the step of: The filtering rule of the diesel filter is that each pressure difference sample in the pressure difference sequence is sequentially decreased, and the decreasing value is within a set threshold range. ​ 6. The method of claim 3, wherein the step of determining the amount of fuel remaining in the filter includes the step of: The sampling period is greater than the detection period. ​ 7. A diesel filter monitoring device for a diesel engine, characterized by The diesel filter monitoring method comprises the following steps: an inlet oil pressure sensor (2), an outlet oil pressure sensor (3), a diesel oil product sensor (4), and a monitor (5) are provided; the inlet oil pressure sensor (2) is installed at the inlet joint of the diesel filter (1), the outlet oil pressure sensor (3) and the diesel oil product sensor (4) are both installed at the outlet joint of the diesel filter (1), the inlet oil pressure sensor (2), the outlet oil pressure sensor (3), and the diesel oil product sensor (4) are electrically connected to the monitor (5) through a wire harness, and the monitor (5) applies the diesel engine diesel filter monitoring method according to any one of claims 1-6 to monitor the working condition of the diesel filter.

Images