Diesel filtering monitoring device and method for diesel engine

Abstract

The invention discloses a diesel filtering monitoring method for a diesel engine, which relates to the diesel engine and comprises the following steps: acquiring 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 and outlet pressure difference according to the oil inlet pressure and the oil outlet pressure, and comparing the oil inlet and outlet pressure difference with a preset pressure difference early warning value. If the inlet and outlet oil pressure difference is larger than or equal to the pressure difference early warning value, filter element alarm information is generated to give an alarm prompt for replacing the diesel oil filter; and obtaining a diesel oil product detection value from the oil outlet joint, comparing the diesel oil product detection value with a preset early warning oil product value, and if the diesel oil product detection value is smaller than the early warning oil product value, generating information that the diesel oil product is unqualified. The invention further discloses a diesel filtering monitoring device for the diesel engine. According to the invention, the filter element replacement is automatically prompted, the maintenance cost is reduced, meanwhile, the filter element can be well controlled not to be overdue for maintenance, and the failure rate of fuel oil equipment is reduced.

Description

Technical Field

[0001] The present invention relates to a diesel engine, and more particularly to a diesel engine diesel filter monitoring device and method. Background Art

[0002] The diesel filter system of a diesel engine has two main functional indicators. One is to ensure that the diesel flow after filtration meets the diesel engine's combustion requirements, and the other is to ensure that the diesel engine oil after filtration meets the injector injection and diesel engine clean combustion requirements. Traditional diesel filters generally do not have a diesel filter monitoring system and are replaced regularly according to the use cycle; or only pressure display gauges are installed before and after, and the front and rear pressure difference is read to determine whether the diesel filter is blocked, thereby determining whether the filter element needs to be replaced.

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

[0004] 1. Without monitoring system: The filter element can only be replaced according to the fixed usage time estimated by 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 a waste of filter element life, resulting in increased maintenance costs, or overdue maintenance leading to untimely oil supply, diesel engine power reduction or untimely response to diesel engine working conditions.

[0005] 2. If the front and rear pressure display gauges are installed, manual inspection and reading comparison are required, which is inconvenient. Moreover, it can only monitor whether the flow rate meets the requirements for replacing the filter element, but cannot monitor the oil quality after filtration. For example, the filter element damage and other faults cannot be monitored. Although the flow rate meets the requirements, the oil quality does not meet the requirements, resulting in unclean diesel flowing into the combustion, causing wear and blockage of precision parts, reducing the service life of the diesel engine, and even directly causing faults, such as component jamming, diesel engine runaway and other major dangerous faults. At the same time, when the oil product that does not meet the cleanliness level is burned, it will also cause combustion deterioration, carbon deposition and other faults, substandard emissions, and accelerated wear of cylinder liners, pistons, etc. Summary of the invention

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

[0007] A diesel filter monitoring method for a diesel engine described in the present invention obtains the oil inlet pressure at the oil inlet joint and the oil outlet pressure at the oil outlet joint of the diesel filter, calculates the inlet and outlet oil pressure difference according to the inlet and outlet pressures, compares the inlet and outlet oil pressure difference with a preset pressure difference warning value, and if the inlet and outlet oil pressure difference is greater than or equal to the pressure difference warning value, generates filter element alarm information to provide an alarm prompt for replacing the diesel filter; obtains the diesel oil quality detection value from the oil outlet joint, and compares the diesel oil quality detection value with a preset warning oil quality value, and if the diesel oil quality detection value is less than the warning oil quality value, generates diesel oil unqualified information.

[0008] Preferably, when the inlet and outlet oil pressure difference is less than the pressure difference warning value, and the diesel oil quality detection value is less than the warning oil quality value, the period in which the inlet and outlet oil pressure difference is located is taken as the current detection period, and the inlet and outlet oil pressure difference of the N detection periods before the current detection period is obtained, and the inlet and outlet oil pressure difference of the N detection periods before the current detection period is subtracted from the inlet and outlet oil pressure difference of the current period one by one to obtain N pressure difference difference values; check whether there is a sudden pressure difference difference value among the N pressure difference difference values, and if so, it is determined that the diesel filter is damaged, and a diesel filter damage alarm message is generated; wherein, N is a natural number greater than 3.

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

[0010] Preferably, M sampling cycles are set, and in each sampling cycle, an inlet and outlet oil pressure difference is randomly collected as a pressure difference sample and a diesel oil quality detection value is randomly collected as a detection sample; it is judged whether each of the detection samples is greater than or equal to the warning oil quality value; if each of the detection samples is greater than or equal to the warning oil quality value, the pressure difference samples are sorted according to the time sequence of the sampling cycles to obtain a pressure difference sequence; according to the filtering law of the diesel filter, it is judged whether the sorting of the pressure difference sequence is normal; if it is abnormal, a warning message of unqualified diesel oil quality is generated; wherein, M is a natural number greater than 3.

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

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

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

[0014] A diesel filter monitoring device for a diesel engine comprises an oil inlet pressure sensor, an oil outlet pressure sensor, a diesel oil product sensor and a monitor; the oil inlet pressure sensor is installed at the oil inlet joint of the diesel filter, the oil outlet pressure sensor and the diesel oil product sensor are both installed at the oil outlet joint of the diesel filter, the oil inlet pressure sensor, the oil outlet pressure sensor and the diesel oil product sensor are electrically connected to the monitor at the same time through a wiring harness, and the monitor uses the diesel engine diesel filter monitoring method to monitor the working condition of the diesel filter.

[0015] Beneficial Effects

[0016] The advantages of the present invention are: according to the pressure difference comparison before and after the diesel filter is filtered and the oil quality detection result after filtering, it can realize automatic reminder to replace the filter element, reduce maintenance costs, and at the same time can well control the filter element from being overdue for maintenance, and also remind the driver to provide reliable quality oil for the diesel used in the diesel engine. In addition, by using the dual reminder of oil quality and pressure difference, it can also effectively protect the fuel system equipment such as the injection pump and nozzle at the rear end of the filter, and reduce the failure rate of the fuel equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a diesel engine diesel filter monitoring device of the present invention.

[0018] Among them: 1-diesel filter, 2-oil inlet pressure sensor, 3-oil outlet pressure sensor, 4-diesel oil quality sensor. DETAILED DESCRIPTION

[0019] 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.

[0020] A diesel filter monitoring method of the present invention 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 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 warning value, and if the oil inlet and outlet pressure difference is greater than or equal to the pressure difference warning value, it means that the diesel filter oil inlet has been clogged, and at this time, a filter element alarm message is generated to provide an alarm prompt for replacing the diesel filter. The diesel oil quality detection value from the oil outlet joint is obtained, and the diesel oil quality detection value is compared with the preset warning oil quality value. If the diesel oil quality detection value is less than the warning oil quality value, it means that the diesel currently used in the diesel engine is of insufficient purity, and a diesel oil quality unqualified message is generated to remind the driver to replace the 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 oil quality after filtration, and the automatic prompt for filter element replacement are realized.

[0021] Considering that when the diesel filter is damaged, the impurities filtered out in the early stage will flow out with the diesel and affect the quality of the diesel, thus leading to misjudgment. To solve this problem, in this embodiment, when the inlet and 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, that is, the pressure difference of the current detection cycle is normal but the diesel oil product detection result is abnormal, then the cycle where the inlet and outlet oil pressure difference is located is used as the current detection cycle, and the inlet and outlet oil pressure difference of the N detection cycles before the current detection cycle is obtained. Then, the inlet and outlet oil pressure differences of the previous N detection cycles are subtracted from the inlet and outlet oil pressure difference of the current cycle one by one to obtain N pressure difference differences. Check whether there is a sudden pressure difference difference among the N pressure difference differences. If so, it is determined that the diesel filter is damaged, and a diesel filter damage alarm message is generated. When the diesel filter is working normally, due to the influence of filtered debris, the inlet and outlet oil pressure difference should decrease linearly. However, when the diesel filter is damaged, especially when the filtering function is damaged, the debris filtered out in the early stage will be released into the diesel in a short time. At the same time, the inlet and outlet oil pressure difference will also change significantly, generally decreasing suddenly. Therefore, the present invention cleverly utilizes the phenomenon of sudden change in pressure difference when the diesel filter is damaged, so as to accurately judge whether the abnormality of the current diesel oil test result is caused by damage to the diesel filter, thereby greatly improving the accuracy of diesel filter monitoring.

[0022] In this embodiment, the method for determining the sudden pressure difference is as follows: among the N pressure difference values, after removing the largest pressure difference value and the smallest pressure difference value, the remaining pressure difference values ​​are averaged to obtain the difference mean; the pressure difference value outside the percentage range set by the difference mean is taken as the sudden pressure difference value. The maximum value and the minimum value are excluded from the mean, so that the sudden pressure difference value can be searched more accurately.

[0023] In view of the quality of diesel oil products, the present invention also designs an early warning mechanism. Specifically, M sampling cycles are set, and an inlet and outlet oil pressure difference is randomly collected as a pressure difference sample and a diesel oil product detection value as a detection sample in each sampling cycle. It is judged whether each detection sample is greater than or equal to the early warning oil product value. If each detection sample is greater than or equal to the early warning oil product value, the pressure difference samples are sorted according to the time sequence of the sampling cycle to obtain a pressure difference sequence. According to the filtering law of the diesel filter, it is judged whether the sorting of the pressure difference sequence is normal. If it is abnormal, a warning message of unqualified diesel oil products is generated. That is, under the premise that the diesel oil products are normal, by monitoring the normality of the sorting between the pressure difference sequences, it is also possible to effectively judge whether the diesel oil products currently used are 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 decreases in sequence, and the decreasing value is within the set threshold range, it is considered that the order of the pressure difference sequence is normal, and the diesel oil can be relatively pure; but if each pressure difference sample in the pressure difference sequence decreases in sequence, but the decreasing value exceeds the set threshold range, it is considered that there are more impurities in the diesel, and the diesel oil is not good. At this time, corresponding information can be generated to remind the driver to add qualified diesel. This design helps the driver monitor the sources of different oil products.

[0024] 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 short sampling period causing the early warning mechanism to occupy too much CPU resources.

[0025] See also Figure 1 The present invention also provides a diesel filter monitoring device for a diesel engine, comprising an oil inlet pressure sensor 2, an oil outlet pressure sensor 3, a diesel oil product sensor 4 and a monitor 5; the oil inlet pressure sensor 2 is installed at the oil inlet joint of the diesel filter 1, the oil outlet pressure sensor 3 and the diesel oil product sensor 4 are both installed at the oil outlet joint of the diesel filter 1, the oil inlet pressure sensor 2, the oil outlet pressure sensor 3 and the diesel oil product sensor 4 are electrically connected to the monitor 5 through a wiring harness at the same time, and the monitor 5 uses the above-mentioned diesel filter monitoring method for a diesel engine to monitor the working condition of the diesel filter, thereby achieving the purpose of automatically monitoring the pressure difference before and after the diesel filter and the quality of the oil after filtering in real time, and automatically prompting the replacement of the filter element.

[0026] 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 diesel engine diesel filtration monitoring method, characterized in that: The oil inlet pressure at the oil inlet joint and the oil outlet pressure at the oil outlet joint of the diesel filter are obtained, the inlet and outlet oil pressure differences are calculated according to the inlet and outlet oil pressures, the inlet and outlet oil pressure differences are compared with a preset pressure difference warning value, and if the inlet and outlet oil pressure differences are greater than or equal to the pressure difference warning value, a filter element alarm message is generated to prompt an alarm to replace the diesel filter; the diesel oil quality detection value from the oil outlet joint is obtained, and the diesel oil quality detection value is compared with a preset warning oil quality value, and if the diesel oil quality detection value is less than the warning oil quality value, a diesel oil quality unqualified message is generated.

2. A diesel engine diesel filtration monitoring method according to claim 1, characterized in that: When the inlet and outlet oil pressure difference is less than the pressure difference warning value, and the diesel oil quality detection value is less than the warning oil quality value, the cycle in which the inlet and outlet oil pressure difference is located is used as the current detection cycle, and the inlet and outlet oil pressure differences of the N detection cycles before the current detection cycle are obtained, and the inlet and outlet oil pressure differences of the N detection cycles before the current cycle are subtracted from the inlet and outlet oil pressure differences of the current cycle one by one to obtain N pressure difference difference values; check whether there is a sudden pressure difference difference value among the N pressure difference difference values, and if so, it is determined that the diesel filter is damaged, and a diesel filter damage alarm message is generated; wherein, N is a natural number greater than 3.

3. A diesel engine diesel filtration 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 pressure difference value and the smallest pressure difference value, the remaining pressure difference values ​​are averaged to obtain a difference mean; and the pressure difference value outside the percentage range set by the difference mean is taken as the sudden pressure difference value.

4. A diesel engine diesel filtration monitoring method according to claim 2, characterized in that: M sampling cycles are set, and in each sampling cycle, an inlet and outlet oil pressure difference is randomly collected as a pressure difference sample and a diesel oil quality detection value is randomly collected as a detection sample; it is judged whether each of the detection samples is greater than or equal to the warning oil quality value; if each of the detection samples is greater than or equal to the warning oil quality value, the pressure difference samples are sorted according to the time sequence of the sampling cycles to obtain a pressure difference sequence; according to the filtering law of the diesel filter, it is judged whether the sorting of the pressure difference sequence is normal; if it is abnormal, a warning message of unqualified diesel oil is generated; wherein, M is a natural number greater than 3.

5. A diesel engine diesel filtration monitoring method according to claim 4, characterized in that: The filtering rule of the diesel filter is that each pressure difference sample in the pressure difference sequence is equal.

6. A diesel engine diesel filtration monitoring method according to claim 4, characterized in that: The filtering rule of the diesel filter is that each pressure difference sample in the pressure difference sequence decreases in sequence, and the decreasing value is within a set threshold range.

7. A diesel engine diesel filtration monitoring method according to claim 4, characterized in that: The sampling period is greater than the detection period.

8. A diesel filter monitoring device for a diesel engine, characterized in that: The invention comprises an oil inlet pressure sensor (2), an oil outlet pressure sensor (3), a diesel oil quality sensor (4) and a monitor (5); the oil inlet pressure sensor (2) is installed at the oil inlet joint of the diesel filter (1), the oil outlet pressure sensor (3) and the diesel oil quality sensor (4) are both installed at the oil outlet joint of the diesel filter (1), the oil inlet pressure sensor (2), the oil outlet pressure sensor (3) and the diesel oil quality sensor (4) are electrically connected to the monitor (5) through a wiring harness at the same time, and the monitor (5) uses the diesel filter monitoring method for a diesel engine as described in any one of claims 1 to 7 to monitor the working condition of the diesel filter.

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