Off-line electrically-driven cleanliness control system

Abstract

An off-line type electrically-driven cleanliness control system comprises an electronic pump, and the electronic pump is communicated with an oil tank through a suction filter and communicated with a speed reducer and a driving motor through an oil cooler. The electronic pump is a bidirectional electronic pump, a first one-way valve is arranged between the suction filter and the electronic pump, a second one-way valve is arranged between the electronic pump and the oil cooler, and a third one-way valve is arranged between the common end of the first one-way valve and the suction filter and the common end of the second one-way valve and the electronic pump. A fourth one-way valve and a press filter are sequentially arranged between the common end of the first one-way valve and the electronic pump and the oil tank; the press filter of the electric drive cooling and lubricating system is independent, does not work along with the operation of the cooling and lubricating system, and filters oil of the electric drive system in an off-line working mode, so that the problems of flow reduction, motor overheating, ablation and the like caused by blockage of a filter element in a traditional scheme are solved, and the cost of parts is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicle electric drive cooling and lubrication, and particularly relates to an offline electric drive cleanliness control system. Background Art

[0002] At present, the electric drive cooling and lubrication system of new energy vehicles mainly consists of hardware such as a suction filter, an electronic pump, a pressure filter, an oil cooler, etc. These hardware components are essential for the oil-cooled electric drive system of new energy vehicles. During operation, like the electric drive cooling and lubrication system in a self-checking method of an electric drive cooling and lubrication system with the authorized announcement number CN117704260B, the electronic pump operates to pump oil from the suction filter (coarse filter) and pump the oil into the pressure filter for fine filtration, and then enters the oil cooler for heat exchange. One way of the oil is sent to the drive motor for lubrication and cooling, and the other way of the oil is sent to the reduction gearbox for lubrication and cooling; among them, the resistance of the pressure filter accounts for 1 / 2 of the back pressure of the electronic pump, and an electronic pump with a larger power is required to ensure the target flow rate, increasing the cost of components; at the same time, since the pressure filter continuously captures pollutants during the operation of the system, as the filter element becomes increasingly blocked, the resistance of the filter element increases, which easily leads to a reduction in the flow rate of the system, and further causes problems such as overheating and abnormal wear of the system. During the operation of traditional oil vehicles, the pressure filter is in an online operation state. Currently, in the electric drive cooling and lubrication system, the pressure filter is also in an online operation mode. Due to the particularity of the electric drive and it being a new thing, so in the case where it is found that the pressure filter is in an online operation mode so far, if the pressure filter is to break through the online operation mode and ensure that the transformation plan has a low cost, this is the problem to be solved by this patent. Summary of the Utility Model

[0003] Aiming at the problems in the prior art, the utility model provides an offline electric drive cleanliness control system, aiming to break through the online operation mode of the pressure filter and reduce the transformation cost.

[0004] An offline electric drive cleanliness control system includes an electronic pump. After the electronic pump pumps lubricating oil through a suction filter, it directly pumps the lubricating oil to the reducer and the drive motor through an oil cooler and lubricates or cools the reducer or the drive motor; the electronic pump is a two-way electronic pump. A first one-way valve is arranged between the suction filter and the electronic pump, and the conduction direction of the first one-way valve is from the suction filter to the electronic pump; a second one-way valve is arranged between the electronic pump and the oil cooler, and the conduction direction of the second one-way valve is from the electronic pump to the oil cooler; a third one-way valve is arranged between the common end of the first one-way valve and the suction filter and the common end of the second one-way valve and the electronic pump, and the conduction direction of the third one-way valve is from the suction filter to the electronic pump; a fourth one-way valve and a pressure filter are sequentially arranged between the common end of the first one-way valve and the electronic pump and the fuel tank, and the conduction direction of the fourth one-way valve is from the electronic pump to the pressure filter; the pressure filter is used to send the finely filtered oil to the fuel tank.

[0005] Further, a first connection node is provided on the pipeline between the fourth one-way valve and the pressure filter, and a second connection node is provided on the pipeline between the pressure filter and the fuel tank.

[0006] Further, the first one-way valve and the third one-way valve are integrated on the suction filter, and the fourth one-way valve is integrated on the pressure filter.

[0007] Further, the suction filter and the pressure filter are integrated together and are both located inside the fuel tank.

[0008] Further, the pressure filter can be an industrial pressure filter.

[0009] Advantages of the present utility model: The pressure filter (fine filter) of the electric drive cooling and lubrication system is separated and does not work with the operation of the cooling and lubrication system. The oil of the electric drive system is filtered in an "offline" working mode to control the cleanliness of the electric drive oil; after the pressure filter is arranged offline, whether it is blocked or not does not affect the flow rate of the cooling and lubrication system, avoiding problems such as reduced flow rate, overheating of the motor, and ablation caused by filter element blockage in the traditional solution; during the normal operation of the cooling and lubrication system, the pressure filter does not generate resistance, and only the oil cooler generates resistance after the electronic pump, so its load is greatly reduced, the power of the electronic pump can be greatly reduced, and the cost of components is reduced; when the system operates in the offline oil cleanliness condition, the flow rate of the electronic pump is only provided for the pressure filter for filtration. The reduction of the system flow rate caused by the blockage of the pressure filter will not affect the electric drive. Therefore, it is allowed that the filter element of the pressure filter is more severely blocked than when used online, increasing the service life of the pressure filter during offline operation and the reliability of the system. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the first embodiment of the present utility model;

[0011] Figure 2 It is the oil cleanliness curve of the electric drive system without a pressure filter in the present utility model;

[0012] Figure 3 It is the oil cleanliness curve of the electric drive system with online filtration of the pressure filter;

[0013] Figure 4 It is the target cleanliness curve of the first embodiment of the present utility model;

[0014] Figure 5 It is the comparison curve of oil cleanliness control in the present utility model;

[0015] Figure 6 It is a schematic structural diagram of the second embodiment of the present utility model; Detailed Embodiments

[0016] The following will describe the present utility model in detail with reference to the accompanying drawings. The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model. The orientation terms such as left, middle, right, up, and down in the embodiments of the present utility model are only relative concepts to each other or are referenced based on the normal use state of the product, and should not be considered as restrictive.

[0017] First Embodiment:

[0018] An off-line electric drive cleanliness control system, as Figure 1 shown, includes an electronic pump 4. The electronic pump 4 is connected to an oil tank 6 through a suction filter 7, and then is respectively connected to a speed reducer 1 and a drive motor 3 through an oil cooler 2. After the electronic pump 4 pumps lubricating oil through the suction filter 7, the lubricating oil is directly pumped to the speed reducer 1 and the drive motor 3 through the oil cooler 2 to lubricate and cool the speed reducer 1 or the drive motor 3; the electronic pump 4 is a two-way electronic pump. A first one-way valve 81 is arranged between the suction filter 7 and the electronic pump 4, and the conduction direction of the first one-way valve 81 is from the suction filter 7 to the electronic pump 4; a second one-way valve 82 is arranged between the electronic pump 4 and the oil cooler 2, and the conduction direction of the second one-way valve 82 is from the electronic pump 4 to the oil cooler 2; a third one-way valve 83 is arranged between the common end of the first one-way valve 81 and the suction filter 7 and the common end of the second one-way valve 82 and the electronic pump 4, and the conduction direction of the third one-way valve 83 is from the suction filter 7 to the electronic pump 4; a fourth one-way valve 84 and a pressure filter 5 are successively arranged between the common end of the first one-way valve 81 and the electronic pump 4 and the oil tank 6, and the conduction direction of the fourth one-way valve 84 is from the electronic pump 4 to the pressure filter 5; the pressure filter 5 is used to send the finely filtered oil into the oil tank 6.

[0019] During operation, when the electronic pump 4 rotates forward, the oil sequentially passes through the suction filter 7, the first one-way valve 81, the electronic pump 4, and the second one-way valve 82 and then is sent to the oil cooler 2; after parking, the drive motor and the reduction gearbox are in a closed state, the electronic pump 4 rotates reversely, and the oil sequentially passes through the suction filter 7, the third one-way valve 83, the electronic pump 4, the fourth one-way valve 84, and the pressure filter 5 and then is sent back to the oil tank 6, thereby finely filtering the oil.

[0020] The cleanliness of the oil in the electric drive system is mainly purified through the pressure filter, and the cleanliness of the oil can be rated according to the ISO-16232 standard; the cleanliness of the oil in the vehicle electric drive system is statistically analyzed. The content of the statistics is the cleanliness level of the 15μm particles in the oil. The higher the level, the more the corresponding number of particles, and the dirtier the oil. The statistical period is 20,000 kilometers. As Figure 2As shown in the figure, when the electric drive system of the vehicle does not have a filter press, it can be seen that the cleanliness of the electric drive oil starts from 0 kilometers after leaving the factory. As the mileage of the vehicle increases, the cleanliness level also increases rapidly. When the vehicle travels to 15,000 kilometers, the cleanliness of the oil in the electric drive system has exceeded the upper limit of the cleanliness level, and the oil can no longer be used, otherwise it will aggravate the wear of the assembly; Figure 3 As shown in the figure, when the vehicle's electric drive system has a filter press and the filter press is filtered online, it can be seen that the oil cleanliness of the assembly has been controlled at a good cleanliness level within 20,000 kilometers; combined with Figure 4 and Figure 5 As shown, according to the utility model, when the vehicle is running, the oil cleanliness of the assembly increases in the state without a filter press, and the oil is cleaned offline several times, that is, once after 5,000 kilometers, so that the cleanliness of the oil is reduced to a lower level in a short time, and the overall oil cleanliness curve fluctuates in a sawtooth shape with the increase of mileage, thereby realizing the control of oil cleanliness.

[0021] In the present invention, a one-way valve is used in conjunction with a two-way electronic pump to select the on-off of the oil circuit, while in other schemes, a solenoid valve or an electric control switch is used to control the on-off of the oil circuit; the cost of the solenoid valve and the electric control switch is much higher than that of the one-way valve, and the cost of an independent one-way valve is about one or two yuan; but the cost of the solenoid valve or the electric control switch is several dozen yuan, especially the cost of a two-position three-way solenoid valve is higher. In addition, the sealing gap of the solenoid valve is relatively small. If the filter press does not participate in the work during normal operation of the vehicle, the cleanliness of the oil is not good, and impurities are easily retained in the gap of the solenoid valve and cause the solenoid valve to get stuck; the sealing gap of the one-way valve is larger and the maximum opening is larger, so it is not easy to get stuck; therefore, a one-way valve is used in conjunction with a two-way electronic pump to realize the scheme of offline operation of the filter press in the electric drive cooling and lubrication system, which has the lowest cost and stable performance.

[0022] Second embodiment:

[0023] Other technical features are the same as those of the first embodiment. Figure 6As shown, a first connection node 91 is provided on the pipeline between the fourth one-way valve 84 and the pressure filter 5, and a second connection node 92 is provided on the pipeline between the pressure filter 5 and the oil tank 6. When the electronic pump 4 in the electric drive cooling and lubrication system directly sends the oil filtered by the suction filter 7 to the oil cooler 2, and the oil output by the oil cooler 2 is directly sent into the drive motor 3 or the reduction gearbox 1, the pressure filter 5 is not connected to the first connection node 91 and the second connection node 91, that is, the pressure filter 5 is not installed on the vehicle; when the electronic pump 4 directly sends the oil filtered by the suction filter 7 into the pressure filter 5, and the oil output by the pressure filter 5 is sent into the oil tank 6, after the pressure filter 5 is connected to the first connection node 91 and the second connection node 92, then the electronic pump 4 is started. At this time, the drive motor 3 and the reduction gearbox 1 are in the closed state. After the oil in the electric drive cooling and lubrication system is cleaned, the pressure filter is removed. At this time, the pressure filter can be an industrial pressure filter, thereby improving the service life of the pressure filter.

[0024] Third Embodiment:

[0025] In the case where other technical features are the same as those of the first embodiment, to make the system more compact, the first one-way valve 81 and the third one-way valve 83 are integrated on the suction filter 7, and the fourth one-way valve 84 is integrated on the pressure filter 5; the suction filter 7 and the pressure filter 5 are integrated together and are both located in the oil tank 6.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An offline electric drive cleanliness control system, including an electronic pump. After the electronic pump pumps lubricating oil through a suction filter, it is characterized in that: Then, the lubricating oil liquid is directly pumped to the reducer and the drive motor through the oil cooler to lubricate and cool the reducer or the drive motor; the electronic pump is a two-way electronic pump, and a first one-way valve is arranged between the suction filter and the electronic pump, and the conduction direction of the first one-way valve is from the suction filter to the electronic pump; a second one-way valve is arranged between the electronic pump and the oil cooler, and the conduction direction of the second one-way valve is from the electronic pump to the oil cooler; a third one-way valve is arranged between the common end of the first one-way valve and the suction filter and the common end of the second one-way valve and the electronic pump, and the conduction direction of the third one-way valve is from the suction filter to the electronic pump; a fourth one-way valve and a pressure filter are sequentially arranged between the common end of the first one-way valve and the electronic pump and the fuel tank, and the conduction direction of the fourth one-way valve is from the electronic pump to the pressure filter; the pressure filter is used to send the finely filtered oil liquid into the fuel tank.

2. The offline electric drive cleanliness control system according to claim 1, wherein: A first connection node is arranged on the pipeline between the fourth one-way valve and the pressure filter, and a second connection node is arranged on the pipeline between the pressure filter and the fuel tank.

3. The offline electric drive cleanliness control system according to claim 1, characterized in that: The first one-way valve and the third one-way valve are integrated on the suction filter, and the fourth one-way valve is integrated on the pressure filter.

4. The offline electric drive cleanliness control system according to claim 3, wherein: The suction filter and the pressure filter are integrated together and are both located in the fuel tank.

5. The offline electric drive cleanliness control system according to claim 3, wherein: The pressure filter can be an industrial pressure filter.

Images