Electronic oil pump extreme load test method

Abstract

An electronic oil pump extreme load test method, comprising the following steps: 1) make the electronic oil pump start running under extreme working condition, the ambient temperature is T1, the oil temperature in the electronic oil pump is T2, the maximum rotating speed of the electronic oil pump assembly is n max ; at this time, the current flowing through the electronic oil pump is I max ; 2) monitor the temperature of MCU and MOS on the PCB board of the electronic oil pump, when the temperature of MCU and MOS rises to T m1 , reduce the rotating speed of the electronic oil pump assembly to n max / 2, increase the oil pressure of the electronic oil pump, and increase the torque, so that the total power remains unchanged, at this time, the current of the electronic oil pump remains I max ; during the process of reducing the rotating speed of the electronic oil pump assembly, reduce the ambient temperature of the electronic oil pump to T3, and further reduce the oil temperature in the electronic oil pump; 3) monitor the oil temperature in the electronic oil pump, when the temperature of the oil in the electronic oil pump reaches T2, return to step 1), repeat the test until the test time exceeds the threshold value. The present application can perform the extreme load performance test under the condition of large current continuous passing without interruption.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle electronically controlled pressure or lubricating oil pump performance testing, specifically to a method for testing the ultimate load of an electronic oil pump. Background Technology

[0002] New energy vehicles are a key focus of the global automotive industry's green development and low-carbon transformation. As a core component of the cooling system in new energy vehicles, the automotive electronic oil pump also possesses significant development potential. Automotive electronic oil pumps are typically 12V and 13.5V electronically controlled cooling oil pumps. Their main working principle involves a host computer sending a model number to the electronic oil pump controller. The controller uses the FOC method to control the speed and torque of the permanent magnet synchronous motor, driving the cycloidal rotor to rotate, increasing the liquid pressure, and circulating the oil to achieve cooling. Well-known domestic and international new energy vehicle assembly plants prioritize stable performance and low price when selecting electronically controlled oil pumps. This places high demands on the matching technology of the controller, motor, and pump head, requiring sufficient load testing to confirm the matching quality and verify the absence of vulnerabilities in the diagnostic logic.

[0003] Among the comprehensive automotive standards of Germany, the US, and Japan, it is difficult to find testing standards for electric vehicle electronic fuel pumps. Even with my country's vigorous development of electric vehicles in recent years, testing standards for automotive electronic fuel pumps are almost nonexistent. The most crucial aspect of matching the controller, motor, and pump head of an electronic fuel pump is the extreme load fault diagnosis test. Currently, automakers generally assess the matching load capacity of the electronic fuel pump assembly using extreme temperature, extreme speed, and extreme pressure. A 200W electronic fuel pump has an extreme ambient temperature of 125℃, an oil temperature of 90℃, an extreme load current of 20A, an extreme speed of 3500rpm, and an extreme load pressure measured inversely based on the current. This is repeated continuously for 100 hours until the temperature inside the motor or controller reaches equilibrium. However, in actual operation, the oil temperature can quickly exceed the ambient temperature by 20℃ from 90℃. Simultaneously, the components on the controller PCB experience significant overcurrent, and the excessively high oil temperature prevents heat dissipation. The MOS and MCU generate temperatures far exceeding 125℃, reaching 140℃, causing the electronic pump to enter protection mode and shut down directly, thus interrupting the extreme load test. Summary of the Invention

[0004] The purpose of this invention is to provide a method for testing the ultimate load of an electronic oil pump, comprising the following steps:

[0005] 1) Start the electronic oil pump under extreme operating conditions: ambient temperature T1, oil temperature inside the electronic oil pump T2, and maximum speed of the electronic oil pump assembly n. max At this time, the current flowing through the electronic oil pump is I. max .

[0006] 2) Monitor the temperature of the MCU and MOS on the electronic oil pump PCB board. When the temperature of the MCU and MOS rises to T... m1 At that time, the speed of the electronic oil pump assembly is reduced to n. max / 2, simultaneously increase the oil pressure output of the electronic oil pump and increase the torque, keeping the total power constant. At this time, the current of the electronic oil pump remains at I. max .

[0007] During the process of reducing the speed of the electronic oil pump assembly, the ambient temperature of the electronic oil pump is reduced to T3, thereby reducing the oil temperature inside the electronic oil pump.

[0008] 3) Monitor the oil temperature inside the electronic oil pump. When the oil temperature inside the electronic oil pump reaches T2, return to step 1) and repeat the test until the test duration exceeds the threshold.

[0009] Furthermore, the ambient temperature T1 is greater than the oil temperature T2 inside the electronic oil pump.

[0010] Furthermore, the temperature T1 is in the range of 90℃ < T1 < 130℃.

[0011] Furthermore, the temperature T2 is in the range of 50℃ < T2 < 120℃.

[0012] Furthermore, the temperature T m1 <T m T m This represents the highest temperature of the MCU and MOS when the electronic oil pump stops working under extreme conditions.

[0013] Furthermore, the temperature T m1 The value is T m -5℃. m This represents the highest temperature of the MCU and MOS when the electronic oil pump stops working under extreme conditions.

[0014] Furthermore, the temperature T3 is lower than the temperature T1.

[0015] Furthermore, the temperature T3 = T1 - 60℃.

[0016] Furthermore, if the electronic oil pump reports an error during the test, and restarts the electronic oil pump n times, if it still cannot start, it is determined that the limit operating conditions of the electronic oil pump assembly have deviated.

[0017] Furthermore, if the electronic oil pump reports an error during the test, restart the electronic oil pump 5 times. If it still cannot start, it is determined that the electronic oil pump assembly has deviated from its limit operating conditions.

[0018] The technical effect of this invention is beyond doubt. This invention provides a performance test method for an electronic oil pump under extreme load, which can conduct extreme load performance tests with continuous high current flow without interruption.

[0019] This invention dissipates heat by changing the ambient temperature and the rotation speed of the electronic oil pump, ensuring the continuous flow of high current within the electronic oil pump. At the same time, the electronic oil pump will not enter protection mode and shut down directly, thus preventing the interruption of the electronic oil pump's extreme load test. Attached Figure Description

[0020] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0022] Example 1:

[0023] See Figure 1 A method for testing the ultimate load of an electronic oil pump includes the following steps:

[0024] 1) Start the electronic oil pump under extreme operating conditions: ambient temperature T1, oil temperature inside the electronic oil pump T2, and maximum speed of the electronic oil pump assembly n. max At this time, the current flowing through the electronic oil pump is I. max .

[0025] 2) Monitor the temperature of the MCU and MOS on the electronic oil pump PCB board. When the temperature of the MCU and MOS rises to T... m1 At that time, the speed of the electronic oil pump assembly is reduced to n. max / 2, simultaneously increase the oil pressure output of the electronic oil pump and increase the torque, keeping the total power constant. At this time, the current of the electronic oil pump remains at I. max .

[0026] During the process of reducing the speed of the electronic oil pump assembly, the ambient temperature of the electronic oil pump is reduced to T3, thereby reducing the oil temperature inside the electronic oil pump.

[0027] 3) Monitor the oil temperature inside the electronic oil pump. When the oil temperature inside the electronic oil pump reaches T2, return to step 1) and repeat the test until the test duration exceeds the threshold.

[0028] Example 2:

[0029] An extreme load test method for an electronic oil pump, the main technical contents of which are described in Example 1, further wherein the ambient temperature T1 is greater than the oil temperature T2 inside the electronic oil pump.

[0030] Example 3:

[0031] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 1 to 2, further wherein the temperature T1 is in the range of 90℃ < T1 < 130℃.

[0032] Example 4:

[0033] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 1 to 3, further wherein the temperature T2 is in the range of 50℃ < T2 < 120℃.

[0034] Example 5:

[0035] A method for testing the ultimate load of an electronic oil pump, the main technical contents of which are described in any one of Examples 1 to 4, further wherein the temperature T m1 <T m T m This represents the highest temperature of the MCU and MOS when the electronic oil pump stops working under extreme conditions.

[0036] Example 6:

[0037] A method for testing the ultimate load of an electronic oil pump, the main technical contents of which are described in any one of Examples 1 to 5, further wherein the temperature T m1 The value is T m -5℃. m This represents the highest temperature of the MCU and MOS when the electronic oil pump stops working under extreme conditions.

[0038] Example 7:

[0039] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 1 to 6, further wherein the temperature T3 is less than the temperature T1.

[0040] Example 8:

[0041] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 1 to 7, wherein the temperature T3 = T1 - 60℃.

[0042] Example 9:

[0043] An extreme load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 1 to 8. Further, if the electronic oil pump reports an error during the test, the electronic oil pump is restarted n times. If it still cannot be started, it is determined that the extreme operating condition of the electronic oil pump assembly has deviated.

[0044] Example 10:

[0045] An extreme load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 1 to 9. Further, if the electronic oil pump reports an error during the test, the electronic oil pump is restarted 5 times. If it still cannot be restarted, it is determined that the extreme operating condition of the electronic oil pump assembly has deviated.

[0046] Example 11:

[0047] See Figure 1 A method for testing the ultimate load of an electronic oil pump includes the following steps:

[0048] 1) Start the electronic oil pump under extreme operating conditions: ambient temperature T1, oil temperature inside the electronic oil pump T2, and maximum speed of the electronic oil pump assembly n. max At this time, the current flowing through the electronic oil pump is I. max .

[0049] 2) Monitor the temperature of the MCU and MOS on the electronic oil pump PCB board. When the temperature of the MCU and MOS rises to T... m1 At that time, the speed of the electronic oil pump assembly is reduced to n. max / 2, simultaneously increase the oil pressure output of the electronic oil pump and increase the torque, keeping the total power constant. At this time, the current of the electronic oil pump remains at I. max .

[0050] As the speed of the electronic oil pump assembly decreases, the rate of temperature rise of the oil inside the electronic oil pump decreases, reducing the ambient temperature of the electronic oil pump to T3, thereby lowering the oil temperature inside the electronic oil pump.

[0051] 3) Monitor the oil temperature inside the electronic oil pump. When the oil temperature inside the electronic oil pump reaches T2, return to step 1) and repeat the test until the test duration exceeds the threshold.

[0052] Example 12:

[0053] An extreme load test method for an electronic oil pump, the main technical contents of which are described in Example 11, further wherein the ambient temperature T1 is greater than the oil temperature T2 inside the electronic oil pump.

[0054] Example 13:

[0055] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 12, wherein the temperature T1 is 90℃.

[0056] Example 14:

[0057] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 13, wherein the temperature T1 is 130℃.

[0058] Example 15:

[0059] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 14, wherein the temperature T1 is 110℃.

[0060] Example 16:

[0061] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 15, further wherein when the temperature T1 is 90℃, 110℃ or 130℃, the temperature T2 is 85℃.

[0062] Example 17:

[0063] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 16, further wherein when the temperature T1 is 90℃, 110℃ or 130℃, the temperature T2 is 50℃.

[0064] Example 18:

[0065] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 17, further wherein when the temperature T1 is 130°C, the temperature T2 is 120°C.

[0066] Example 19:

[0067] A method for testing the ultimate load of an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 18, further wherein the temperature T m1 <T m T m This represents the highest temperature of the MCU and MOS when the electronic oil pump stops operating under extreme conditions. (When the MCU or MOS temperature T ≥ T) m (At this time, the electronic oil pump stops working)

[0068] Example 20:

[0069] A method for testing the ultimate load of an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 19, further wherein the temperature T m1 The value is T m -5℃. m This represents the highest temperature of the MCU and MOS when the electronic oil pump stops operating under extreme conditions. (When the MCU or MOS temperature T ≥ T) m (At this time, the electronic oil pump stops working)

[0070] Example 21:

[0071] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 20, further wherein the temperature T3 is less than the temperature T1.

[0072] Example 22:

[0073] An ultimate load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 21, wherein the temperature T3 = T1 - 60℃.

[0074] Example 23:

[0075] An extreme load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 22. Further, if the electronic oil pump reports an error during the test, the electronic oil pump is restarted n times. If it still cannot be started, it is determined that the extreme operating condition of the electronic oil pump assembly has deviated.

[0076] Example 24:

[0077] An extreme load test method for an electronic oil pump, the main technical contents of which are described in any one of Examples 11 to 23. Further, if the electronic oil pump reports an error during the test, the electronic oil pump is restarted 5 times. If it still cannot be restarted, it is determined that the extreme operating condition of the electronic oil pump assembly has deviated.

[0078] Example 25:

[0079] See Figure 1 A method for testing the ultimate load of an electronic oil pump includes the following steps:

[0080] 1) Start the electronic oil pump under extreme operating conditions: ambient temperature T1, oil temperature inside the electronic oil pump T2, and maximum speed of the electronic oil pump assembly n. max At this time, the current flowing through the electronic oil pump is I. max .

[0081] 2) Monitor the temperature of the MCU and MOS on the electronic oil pump PCB board. When the temperature of the MCU and MOS rises to T... m1 At that time, the speed of the electronic oil pump assembly is reduced to n. max / 2, simultaneously increase the oil pressure output of the electronic oil pump and increase the torque, keeping the total power constant. At this time, the current of the electronic oil pump remains at I. max .

[0082] During the process of reducing the speed of the electronic oil pump assembly, the ambient temperature of the electronic oil pump is reduced to T3, thereby reducing the oil temperature inside the electronic oil pump.

[0083] 3) Monitor the oil temperature inside the electronic oil pump. When the oil temperature inside the electronic oil pump reaches T2, return to step 1) and repeat the test until the test duration exceeds the threshold.

[0084] The ambient temperature T1 is greater than the oil temperature T2 inside the electronic oil pump.

[0085] The temperature T1 is in the range of 90℃ < T1 < 130℃.

[0086] The temperature T2 is in the range of 50℃ < T2 < 120℃.

[0087] The temperature T m1 <T m T m This represents the highest temperature of the MCU and MOS when the electronic oil pump stops working under extreme conditions.

[0088] The temperature T m1 The value is T m -5℃. m This represents the highest temperature of the MCU and MOS when the electronic oil pump stops working under extreme conditions.

[0089] The temperature T3 is less than the temperature T1.

[0090] The temperature T3 = T1 - 60℃.

[0091] If the electronic oil pump reports an error during the test, restart the electronic oil pump n times. If it still cannot start, it is determined that the electronic oil pump assembly has deviated from its limit operating conditions.

[0092] If the electronic oil pump reports an error during the test, restart the electronic oil pump 5 times. If it still cannot start, it is determined that the electronic oil pump assembly has deviated from its limit operating conditions.

[0093] Example 26:

[0094] See Figure 1 An extreme load test method for an electronic oil pump includes the following: 1. The electronically controlled pump starts operating under extreme conditions, with an ambient temperature of T1 (90℃ < T1 < 130℃), an oil temperature of T2 (50℃ < T2 < 120℃), and T1 > T2, and the maximum speed n of the electronic oil pump assembly. max At this time, the current is the maximum current I. max The temperature of the MCU and MOS on the PCB board rises rapidly, and the high-temperature diagnostic temperature is T. m (When the MCU or MOS temperature T≥T) m When the temperature rises to T, the electronic oil pump stops working; 2. When the temperature rises to T m At -5℃, the speed of the electronic oil pump is rapidly reduced to n. max / 2, simultaneously increase the oil pressure at the outlet, increase the torque to keep the total power constant, and maintain the current at I. max 3. When the speed of the electronic oil pump decreases, the rate of oil temperature rise decreases significantly, causing the ambient temperature to drop to T1-60℃, thereby lowering the oil temperature to T2; 4. When the oil temperature reaches the initial temperature T2, the ambient temperature returns to T1, and the speed returns to n. max 5. Repeat the above test procedure until the specified test duration t.

[0095] If an error occurs during this cyclic test procedure, attempt to start the pump 5 times. If it still fails to start, it is determined that the limit conditions of the electronic oil pump assembly have deviated and need to be re-optimized.

Claims

1. A method for testing the ultimate load of an electronic oil pump, characterized in that, Includes the following steps: 1) Start the electronic oil pump under extreme operating conditions, with an ambient temperature of [temperature value missing]. The oil temperature inside the electronic oil pump is The maximum speed of the electronic oil pump assembly is ; At this time, the current flowing through the electronic oil pump is ; 2) Monitor the temperature of the MCU and MOS on the electronic oil pump PCB board. When the temperature of the MCU and MOS rises to... At that time, the speed of the electronic oil pump assembly is reduced to / 2, simultaneously increase the oil pressure output of the electronic oil pump and increase the torque, keeping the total power constant. At this time, the current of the electronic oil pump remains at [value missing]. ; The temperature < ; The highest temperature of the MCU and MOS when the electronic oil pump stops working under extreme conditions; During the process of reducing the speed of the electronic oil pump assembly, the ambient temperature of the electronic oil pump is reduced to [temperature value missing]. This reduces the oil temperature inside the electronic oil pump. 3) Monitor the oil temperature inside the electronic oil pump. When the oil temperature inside the electronic oil pump reaches... If the time is too short, return to step 1) and repeat the experiment until the experiment duration exceeds the threshold.

2. The method for ultimate load testing of an electronic oil pump according to claim 1, characterized in that, The ambient temperature Oil temperature greater than that inside the electronic oil pump .

3. The method for ultimate load testing of an electronic oil pump according to claim 2, characterized in that, The temperature The range is 90℃ < <130℃.

4. The method for ultimate load testing of an electronic oil pump according to claim 1, characterized in that, The temperature The range is 50℃ < <120℃.

5. The method for ultimate load testing of an electronic oil pump according to claim 1, characterized in that, The temperature The value is -5℃; This represents the highest temperature of the MCU and MOS when the electronic oil pump stops working under extreme conditions.

6. The method for ultimate load testing of an electronic oil pump according to claim 1, characterized in that, The temperature Less than temperature .

7. The method for ultimate load testing of an electronic oil pump according to claim 1, characterized in that, The temperature = -60℃.

8. The method for ultimate load testing of an electronic oil pump according to claim 1, characterized in that, If the electronic oil pump reports an error during the test, restart the electronic oil pump n times. If it still cannot start, it is determined that the electronic oil pump assembly has deviated from its limit operating conditions.

9. The method for ultimate load testing of an electronic oil pump according to claim 8, characterized in that, If the electronic oil pump reports an error during the test, restart the electronic oil pump 5 times. If it still cannot start, it is determined that the electronic oil pump assembly has deviated from its limit operating conditions.

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