Suspension oil pump test method and hydraulic valve path for test

Abstract

According to the suspension oil pump test method and the hydraulic valve path for the suspension oil pump test, an outlet of a suspension oil pump is communicated with at least two independent passages, and a valve is arranged to control the communication state of the passages; an inlet of the suspension oil pump is communicated with at least two independent passages, and a valve is arranged to control the communication state of the passages; one passage of the outlet of the suspension oil pump and one passage of the inlet of the suspension oil pump are the same in communicating and closing states and form a first group of passages; the other passage of the outlet of the suspension oil pump and the other passage of the inlet of the suspension oil pump form a second group of passages; adjusting the first group of passages to be communicated and the second group of passages to be closed, so that oil enters from an inlet of the suspension oil pump and is discharged from an outlet, and testing forward rotation of the suspension oil pump; and adjusting the first group of passages to be closed and the second group of passages to be communicated, so that oil is discharged from an inlet of the suspension oil pump and is fed from an outlet, and testing the reverse rotation of the suspension oil pump.

Description

Technical Field

[0001] This invention belongs to the field of suspension oil pump testing technology, specifically relating to a suspension oil pump testing method and a hydraulic valve circuit for testing. Background Technology

[0002] During testing, a certain initial pressure needs to be applied to the suspension oil pump to simulate the accumulator in the vehicle's suspension system. In actual testing, the initial system pressure is adjusted by a ball valve at the suspension oil pump outlet. This method makes system pressure adjustment difficult, results in a long testing cycle, and is inefficient. Furthermore, the suspension oil pump needs to be controlled in both forward and reverse directions, requiring repeated replacement of pipe interfaces, which easily damages the pump's inlet and outlet threads, further contributing to low efficiency.

[0003] like Figure 2 There is a problem with pressure regulation; the ball valve outlet is directly connected to the oil tank, without passing through... Figure 1 The ball valve's left-side circuit returns to port 1 of the suspension oil pump. With this connection, during testing (e.g., forward rotation), the hydraulic pump first establishes pressure at inlet 1 of the suspension oil pump. The ball valve is then adjusted to stabilize the pressure at port 1 at 30 bar (assumed). Next, by starting the suspension oil pump, the pressure at port 2 needs to reach 55 bar (assumed), while the flow meter ensures a certain flow rate. The pressure at port 1 will then drop below 30 bar. Increasing the hydraulic pump speed raises the outlet pressure above 55 bar. At this point, the suspension oil pump speed must be adjusted again to lower the outlet pressure, and the flow rate must be controlled via the ball valve. Therefore, to obtain stable pressure and flow at ports 1 and 2, the hydraulic pump speed, suspension oil pump speed, and ball valve opening must be adjusted simultaneously. This means frequent joint adjustments of these three parameters, making it difficult to maintain a stable pressure value at port 1. The ball valve is located at the rear of the equipment, the hydraulic pump controller is in the electrical cabinet, and the suspension oil pump controller is externally located beside the equipment. Operation is very inconvenient; testing a single forward and reverse pressure and flow rate test of the suspension oil pump takes two hours.

[0004] In summary, the existing technologies have the following shortcomings: there is an urgent need to improve how to shorten testing time, improve testing efficiency, reduce operational complexity, and simplify the testing process. Summary of the Invention

[0005] To overcome the aforementioned problems of the prior art and achieve the above-mentioned objectives and other related objectives, this application provides a suspension oil pump test method, wherein the outlet of the suspension oil pump is connected to at least two independent passages, and a valve is provided to control the connection state of the passages, such that one passage is connected and the other passage is closed, or both passages are closed.

[0006] The inlet of the suspension oil pump is connected to at least two independent passages, and a valve is provided to control the connection status of the passages, so that one passage is connected and the other passage is closed, or both passages are closed.

[0007] The first set of passages consists of an outlet passage for the suspension oil pump and an inlet passage for the suspension oil pump, with the two passages having the same connection and closure status.

[0008] The other passage for the outlet of the suspension oil pump and the other passage for the inlet of the suspension oil pump, and the connection and closure states of the two passages are the same, constitute the second set of passages;

[0009] Adjust the first set of passages to be connected and the second set of passages to be closed, so that oil enters the inlet of the suspension oil pump and exits the outlet, and test the forward rotation of the suspension oil pump.

[0010] Adjust the first set of passages to be closed and the second set of passages to be open, so that the inlet of the suspension oil pump discharges oil and the outlet receives oil, and perform a test of the reverse rotation of the suspension oil pump.

[0011] The pressure source of the suspension oil pump's discharge output is connected to the hydraulic pump through a differential pressure device, serving as the pressure source for the hydraulic pressure at the suspension oil pump's supply end. This reduces the load on the hydraulic pump and stabilizes the inlet pressure of the suspension oil pump.

[0012] The technical solution for the suspension oil pump testing method provided in this application also has the following technical features:

[0013] Preferably, in one embodiment of this application, the inlet passage of the suspension oil pump in the first set of passages is connected to the hydraulic pump, and the outlet passage of the suspension oil pump in the second set of passages is connected to the hydraulic pump.

[0014] Preferably, in one embodiment of this application, the inlet passage of the suspension oil pump in the first set of passages is connected to the hydraulic pump, the relief valve, the throttle valve, and the inlet pressure sensor, and the outlet passage of the suspension oil pump in the second set of passages is connected to the hydraulic pump, the relief valve, the throttle valve, and the inlet pressure sensor.

[0015] Preferably, in one embodiment of this application, the outlet passage of the suspension oil pump in the first set of passages is provided with an outlet pressure sensor and a flow meter;

[0016] The inlet passage of the suspension oil pump in the second set of passages is equipped with an outlet pressure sensor and a flow meter.

[0017] Preferably, in one embodiment of this application, the outlet passage of the suspension oil pump in the first set of passages is connected in series with the ball valve and the output end of the hydraulic pump.

[0018] The inlet passage of the second set of suspension oil pumps is connected in series with a ball valve and the output end of the hydraulic pump; this is used to stabilize the inlet pressure of the suspension oil pump, so that the increased pressure formed by the discharge of the suspension oil pump is connected to the output end of the hydraulic pump through the ball valve, and then to the inlet of the suspension oil pump again, forming a stable pressure supply.

[0019] Preferably, in one embodiment of this application, the outlet of the suspension oil pump is connected to a tee for connecting two independent passages;

[0020] The outlet of the suspension oil pump is connected to a tee to connect two independent passages.

[0021] Preferably, in one embodiment of this application, the initial pressure setting step involves: adjusting the throttle valve, setting a hydraulic pump at a certain speed, and obtaining the required initial pressure;

[0022] After the initial pressure was set, the initial pressure stabilized.

[0023] The output flow of the hydraulic pump meets the following conditions: the suspension oil pump will not experience dry suction; the forward and reverse rotation tests of the suspension oil pump are completed by connecting and closing the first and second sets of passages.

[0024] A hydraulic valve circuit for testing a suspension oil pump, wherein the outlet of the suspension oil pump is connected to at least two independent passages, and a valve is provided to control the connection state of the passages, such that one passage is connected and the other passage is closed, or both passages are closed.

[0025] The inlet of the suspension oil pump is connected to at least two independent passages, and a valve is provided to control the connection status of the passages, so that one passage is connected and the other passage is closed, or both passages are closed.

[0026] The first set of passages consists of an outlet passage for the suspension oil pump and an inlet passage for the suspension oil pump, with the two passages having the same connection and closure status.

[0027] The other passage for the outlet of the suspension oil pump and the other passage for the inlet of the suspension oil pump, and the connection and closure states of the two passages are the same, constitute the second set of passages;

[0028] Adjust the first set of passages to be connected and the second set of passages to be closed, so that oil enters the inlet of the suspension oil pump and exits the outlet, and test the forward rotation of the suspension oil pump.

[0029] Adjust the first set of passages to be closed and the second set of passages to be open, so that the inlet of the suspension oil pump discharges oil and the outlet receives oil, and conduct a test of the reverse rotation of the suspension oil pump.

[0030] The technical solution for a hydraulic valve circuit for testing a suspension oil pump provided in this application also has the following technical features:

[0031] Preferably, in one embodiment of this application, the inlet passage of the suspension oil pump in the first set of passages is connected to the hydraulic pump, and the outlet passage of the suspension oil pump in the second set of passages is connected to the hydraulic pump.

[0032] Preferably, in one embodiment of this application, the inlet passage of the suspension oil pump in the first set of passages is connected to the hydraulic pump, the relief valve, the throttle valve, and the inlet pressure sensor, and the outlet passage of the suspension oil pump in the second set of passages is connected to the hydraulic pump, the relief valve, the throttle valve, and the inlet pressure sensor.

[0033] Preferably, in one embodiment of this application, the outlet passage of the suspension oil pump in the first set of passages is provided with an outlet pressure sensor and a flow meter;

[0034] The inlet passage of the suspension oil pump in the second set of passages is equipped with an outlet pressure sensor and a flow meter.

[0035] Preferably, in one embodiment of this application, the outlet passage of the suspension oil pump in the first set of passages is connected in series with the ball valve and the output end of the hydraulic pump.

[0036] The inlet passage of the second set of passages is connected in series with the ball valve and the output end of the hydraulic pump.

[0037] This is used to stabilize the inlet pressure of the suspension oil pump, so that the increased pressure formed by the discharge of the suspension oil pump is connected to the output end of the hydraulic pump through the ball valve, and then to the inlet of the suspension oil pump again, forming a stable pressure supply.

[0038] Preferably, in one embodiment of this application, the outlet of the suspension oil pump is connected to a tee for connecting two independent passages;

[0039] The outlet of the suspension oil pump is connected to a tee to connect two independent passages.

[0040] The beneficial effects of this application are as follows:

[0041] 1. This application uses the first group of channels and the second group of channels to quickly achieve the connection and closure of the two channels by switching the first group of channels and the second group of channels, so that the forward and reverse rotation of the suspension oil pump can be switched quickly, which greatly shortens the test cycle. After the improvement, it takes 0.5 hours to test the forward and reverse pressure and flow of a suspension oil pump. In comparison, it takes 2 hours to test the forward and reverse pressure and flow of a suspension oil pump before the improvement, which shortens the time by 75%.

[0042] 2. During the testing process of this application, the hydraulic pump only needs to adjust its speed when establishing the initial pressure and when establishing the pressure at port 1; during subsequent pressure and flow rate adjustments at ports 2, the pressure at port 1 remains stable at the initial value throughout the entire testing process.

[0043] 3. During the testing process of this application, the suspension oil pump does not require pipe replacement for forward and reverse rotation. Only the valve on / off configuration needs to be changed, which does not damage the threaded port of the suspension oil pump and saves time on pipe replacement.

[0044] 4. This application utilizes the pressure difference generated between the inlet and outlet of the suspension oil pump during the working test, which causes the oil supply pressure at the inlet to drop. If the oil supply is static, a negative pressure will be formed, resulting in unstable pressure on the inlet side of the suspension oil pump, making it difficult to achieve stable test conditions. The increased pressure generated on the outlet side is incorporated into the hydraulic pump and sent to the inlet side. By using a ball valve, a stable inlet pressure source is formed, thereby stabilizing the oil supply pressure on the inlet side and meeting the conditions for stable testing of the suspension oil pump. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the hydraulic valve circuit for testing the suspension oil pump in a suspension oil pump testing method according to the present invention;

[0046] Figure 2 This is a schematic diagram of the hydraulic valve circuit used for testing the existing suspension oil pump. Detailed Implementation

[0047] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings. These embodiments are only for illustrating this application and are not intended to limit the invention.

[0048] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0051] like Figure 1 A suspension oil pump test method, wherein the outlet of the suspension oil pump is connected to at least two independent passages, and a valve is provided to control the connection state of the passages, such that one passage is connected and the other passage is closed, or both passages are closed.

[0052] The inlet of the suspension oil pump is connected to at least two independent passages, and a valve is provided to control the connection status of the passages, so that one passage is connected and the other passage is closed, or both passages are closed.

[0053] The first set of passages consists of an outlet passage for the suspension oil pump and an inlet passage for the suspension oil pump, with the two passages having the same connection and closure status.

[0054] The other passage for the outlet of the suspension oil pump and the other passage for the inlet of the suspension oil pump, and the connection and closure states of the two passages are the same, constitute the second set of passages;

[0055] Adjust the first set of passages to be connected and the second set of passages to be closed, so that oil enters the inlet of the suspension oil pump and exits the outlet, and test the forward rotation of the suspension oil pump.

[0056] Adjust the first set of passages to be closed and the second set of passages to be open, so that the inlet of the suspension oil pump discharges oil and the outlet receives oil, and perform a test of the reverse rotation of the suspension oil pump.

[0057] When this application is implemented, it has the following characteristics:

[0058] Compared with existing technologies, such as Figure 2 This application utilizes a first group of pathways and a second group of pathways. By switching between the first and second groups of pathways, the connection and closure of the two pathways can be quickly achieved, allowing for rapid switching between forward and reverse rotation of the suspension oil pump, significantly shortening the testing cycle. After the improvement, testing a suspension oil pump in both forward and reverse rotation requires 0.5 hours, compared to 2 hours before the improvement, reducing the time by 75%. During the test, the hydraulic pump only needs to adjust its speed when establishing the initial pressure and during the establishment of port 1 pressure. During subsequent adjustments of port 2 pressure and flow rate, port 1 pressure remains stable at its initial value throughout the entire test.

[0059] like Figure 2 Prior to the application of this application, the working process of the prior art in the open-loop control state of the ball valve outlet oil inlet tank is as follows:

[0060] The ball valve outlet is directly connected to the oil tank. So for the suspension oil pump, if one port is for oil inlet and two ports are for oil outlet, that is, valve 1 is the oil inlet side and valve 2 is the oil outlet side.

[0061] When it is necessary to increase the discharge pressure on the drain side of valve 2, the inlet pressure on the inlet side of valve 1 will decrease. Since the pressure and flow of the pipeline system are released into the oil tank, in order to continue to complete the suspension oil pump test, it is necessary to increase the hydraulic pump speed to cope with this change. The purpose is to maintain the pressure at port 1 of the suspension oil pump at a constant value and increase the pressure at port 2 of the suspension oil pump. In order to gradually increase the pressure at port 2 of the suspension oil pump, it is necessary to continuously adjust the hydraulic pump speed to maintain the pressure at port 1, so as to ensure that there is sufficient flow and pressure at port 1 of the suspension oil pump to complete the complete test of the suspension oil pump.

[0062] like Figure 1 By applying this application, the ball valve outlet returns to the upstream of valve 1 in a closed-loop control.

[0063] The ball valve outlet is directly connected back to valve 1. For the suspension oil pump, if port 1 is the inlet and port 2 is the outlet, when pressure needs to be increased at port 2, the pressure at port 1 will decrease. At this time, the flow from the ball valve outlet will flow back to port 1, replenishing the pressure and flow lost at port 1. Simply put, from the inlet pressure sensor to the outlet pressure sensor, then to the ball valve, and back to the inlet pressure sensor, this is a closed loop with no flow loss, even though the suspension oil pump rotation increases the pressure at port 2. If there is no flow loss, the hydraulic pump speed is also constant. This achieves the goal of maintaining stable inlet pressure and flow at port 1, and obtaining high pressure and a certain flow at the outlet of port 2.

[0064] From the perspective of energy conservation: the hydraulic energy generated by the hydraulic pump is sent to the suspension oil pump and then pumped out after being pressurized by the suspension oil pump, further increasing the hydraulic energy, without any energy loss or damage.

[0065] Before the improvement: If the hydraulic energy is directly discharged to the oil tank through the ball valve, the hydraulic energy will be completely reduced to zero. The hydraulic pump needs to continuously increase the hydraulic energy, consume energy, continuously discharge oil, and then continuously consume hydraulic energy in order to complete the continuous test of the suspension oil pump.

[0066] After improvement: By using a ball valve to reduce pressure, the pressure in the booster section of the suspension oil pump is eliminated and fed into the hydraulic pump, which then supplies the oil to the inlet side of the suspension oil pump. The pressure reduction by the ball valve consumes some hydraulic energy. During the test, the hydraulic energy output by the hydraulic pump is connected to the inlet side of the suspension oil pump via the ball valve on the outlet side, thus enabling most of the hydraulic energy to be recovered. This results in less energy loss and lower energy consumption, and also helps stabilize the pressure on the output side of the hydraulic pump. Therefore, during continuous testing of the suspension oil pump, the improved design results in less hydraulic energy consumption, or rather, less hydraulic energy loss, with the loss approximately equal to the output power of the suspension oil pump.

[0067] Specifically, in one embodiment of this application, the inlet passage of the suspension oil pump in the first set of passages is connected to the hydraulic pump, and the outlet passage of the suspension oil pump in the second set of passages is connected to the hydraulic pump.

[0068] Specifically, in one embodiment of this application, the inlet passage of the suspension oil pump in the first set of passages is connected to the hydraulic pump, the relief valve, the throttle valve, and the inlet pressure sensor, and the outlet passage of the suspension oil pump in the second set of passages is connected to the hydraulic pump, the relief valve, the throttle valve, and the inlet pressure sensor.

[0069] Preferably, in one embodiment of this application, the outlet passage of the suspension oil pump in the first set of passages is provided with an outlet pressure sensor and a flow meter;

[0070] The inlet passage of the suspension oil pump in the second set of passages is equipped with an outlet pressure sensor and a flow meter.

[0071] Preferably, in one embodiment of this application, the outlet passage of the suspension oil pump in the first set of passages is connected in series with the ball valve and the output end of the hydraulic pump.

[0072] The inlet passage of the second set of passages is connected in series with the ball valve and the output end of the hydraulic pump.

[0073] This is used to stabilize the inlet pressure of the suspension oil pump, so that the increased pressure formed by the discharge of the suspension oil pump is connected to the output end of the hydraulic pump through the ball valve, and then to the inlet of the suspension oil pump again, forming a stable pressure supply.

[0074] Specifically, in one embodiment of this application, the outlet of the suspension oil pump is connected to a tee to connect two independent passages;

[0075] The outlet of the suspension oil pump is connected to a tee to connect two independent passages.

[0076] Specifically, in one embodiment of this application, such as Figure 1 A hydraulic valve circuit for testing a suspension oil pump, wherein the outlet of the suspension oil pump is connected to at least two independent passages, and a valve is provided to control the connection state of the passages, such that one passage is connected and the other passage is closed, or both passages are closed.

[0077] The inlet of the suspension oil pump is connected to at least two independent passages, and a valve is provided to control the connection status of the passages, so that one passage is connected and the other passage is closed, or both passages are closed.

[0078] The first set of passages consists of an outlet passage for the suspension oil pump and an inlet passage for the suspension oil pump, with the two passages having the same connection and closure status.

[0079] The other passage for the outlet of the suspension oil pump and the other passage for the inlet of the suspension oil pump, and the connection and closure states of the two passages are the same, constitute the second set of passages;

[0080] Adjust the first set of passages to be connected and the second set of passages to be closed, so that oil enters the inlet of the suspension oil pump and exits the outlet, and test the forward rotation of the suspension oil pump.

[0081] Adjust the first set of passages to be closed and the second set of passages to be open, so that the inlet of the suspension oil pump discharges oil and the outlet receives oil, and conduct a test of the reverse rotation of the suspension oil pump.

[0082] Specifically, in one embodiment of this application, the inlet passage of the suspension oil pump in the first set of passages is connected to the hydraulic pump, and the outlet passage of the suspension oil pump in the second set of passages is connected to the hydraulic pump.

[0083] Specifically, in one embodiment of this application, the inlet passage of the suspension oil pump in the first set of passages is connected to the hydraulic pump, the relief valve, the throttle valve, and the inlet pressure sensor, and the outlet passage of the suspension oil pump in the second set of passages is connected to the hydraulic pump, the relief valve, the throttle valve, and the inlet pressure sensor.

[0084] Preferably, in one embodiment of this application, the outlet passage of the suspension oil pump in the first set of passages is provided with an outlet pressure sensor and a flow meter;

[0085] The inlet passage of the suspension oil pump in the second set of passages is equipped with an outlet pressure sensor and a flow meter.

[0086] Preferably, in one embodiment of this application, the outlet passage of the suspension oil pump in the first set of passages is connected in series with the ball valve and the output end of the hydraulic pump.

[0087] The inlet passage of the second set of passages is connected in series with the ball valve and the output end of the hydraulic pump.

[0088] This is used to stabilize the inlet pressure of the suspension oil pump, so that the increased pressure formed by the discharge of the suspension oil pump is connected to the output end of the hydraulic pump through the ball valve, and then to the inlet of the suspension oil pump again, forming a stable pressure supply.

[0089] Specifically, in one embodiment of this application, the outlet of the suspension oil pump is connected to a tee to connect two independent passages;

[0090] The outlet of the suspension oil pump is connected to a tee to connect two independent passages.

[0091] Specifically, in one embodiment of this application, the testing method for the suspension oil pump includes a ball valve, a relief valve, an AC variable frequency motor, a hydraulic pump, a check valve, a filter, a pressure sensor, a flow meter, a temperature sensor, a heat exchanger, the suspension oil pump, and various pipeline connections. The inlet and outlet ports of the suspension oil pump are connected to the inlet and outlet pressure sensor pipelines respectively through pipelines. The throttle valve and the outlet ball valve are used to set a certain opening degree to ensure the pressure balance between the inlet and outlet. The relief valve is set according to the maximum safe pressure to ensure that the system does not overpressure. The pressure sensor is used to detect the pressure difference between the pump inlet and outlet. The check valve prevents liquid from flowing back to the hydraulic pump. The filter can filter impurities in the oil to prevent impurities from entering the suspension oil pump and causing the pump head to jam. The cooling pump, temperature sensor, and heat exchanger can control the oil temperature within a certain range. Valve 1 and valve 2 are grouped together, and valve 3 and valve 4 are grouped together. This combination can easily achieve forward and reverse rotation.

[0092] Specifically, in one embodiment of this application, the throttle orifice and ball valve are opened to a certain degree, valves 3 and 4 are closed, and valves 1 and 2 are opened. The pressure of the relief valve is set at 90 bar. The cooling pump is started to maintain the oil tank temperature at approximately 23 degrees Celsius. The hydraulic pump is started, and the pump speed is increased by setting the frequency of the inverter, so that the value of the inlet pressure sensor reaches 30 bar or 60 bar. At this time, since a pipe is connected from the outlet of the suspension oil pump, the flow meter and ball valve return to the inlet of the suspension oil pump, so the pressure values ​​at the inlet and outlet are the same. The function of the throttle orifice is to maintain the hydraulic pump at a certain speed, so that the system pressure does not continuously rise. This ensures that at a certain speed (30 bar, hydraulic pump speed is approximately 1000 rpm; 60 bar, hydraulic pump speed is approximately 2000 rpm; linear relationship), the required inlet and outlet pressure balance of the suspension oil pump is obtained. Then, the controller drives the suspension oil pump to rotate forward. As the speed increases, the outlet pressure gradually increases. The opening of the ball valve is adjusted according to the test requirements, thus obtaining the required outlet flow rate and pressure. The outlet pressure is typically 5-25 bar higher than the inlet pressure. During adjustment, the inlet pressure will increase slightly by about 0.5 bar as the outlet pressure increases. At this point, slightly reducing the hydraulic pump speed will bring it back to the initial set value. Then, the flow rate and suspension pump power are tested under different outlet pressures according to the test conditions.

[0093] Specifically, in one embodiment of this application, the throttle orifice and ball valve are opened to a certain degree, valves 1 and 2 are closed, and valves 3 and 4 are opened. The pressure of the relief valve is set at 90 bar. At this time, hydraulic oil needs to enter from the outlet of the suspension oil pump and exit from the inlet of the suspension oil pump. By changing the speed of the hydraulic pump, the pressure at the pump inlet and outlet can be adjusted between 5-25 bar or 35-55 bar. Then, the controller drives the suspension oil pump to reverse. As the speed increases, the pump inlet pressure (the front end of valve 3) will gradually increase. The opening of the ball valve is adjusted according to the test requirements to maintain this pressure at 30 bar or 60 bar respectively. At the same time, the speed of the suspension oil pump is adjusted to obtain the pressure, flow rate, and power required for the test.

[0094] In summary, this invention aims to solve the problems of complex testing processes, cumbersome operations, and low testing efficiency caused by switching oil lines and controlling pressure in existing suspension oil pump testing.

[0095] The means and methods used in this invention:

[0096] By connecting a pipe from the outlet of the adjustable ball valve of the suspension oil pump to the inlet of the suspension oil pump and disconnecting the circuit from the ball valve outlet to the oil tank, the initial pressure setting of the suspension oil pump is achieved; by adding valves 1 to 4, it is convenient to switch between forward and reverse rotation.

[0097] This invention provides a method for setting the initial pressure during suspension oil pump testing. Its technical advantage lies in allowing the required initial pressure to be obtained simply by adjusting the throttle valve and setting a specific hydraulic pump speed during the initial test. Once the initial pressure is set, it remains stable. The large output flow of the hydraulic pump ensures that the suspension oil pump does not experience dry suction. Four valves are installed at both ends of the suspension oil pump. By closing valves 3 and 4 and opening valves 1 and 2, the suspension oil pump can be driven in forward rotation. Opening valves 1 and 2 and closing valves 3 and 4 allows the suspension oil pump to be driven in reverse rotation. This improves testing efficiency and avoids the need to disassemble and reassemble pipes, replace inlet and outlet pipes, and damage the inlet and outlet threads.

[0098] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method of testing a suspension oil pump, characterized by, The outlet of the suspension oil pump is connected with at least two independent channels, and a valve is arranged to control the connection state of the channels, so that one of the channels is in a connection state, and the other channel is in a closed state, or both channels are closed; The inlet of the suspension oil pump is connected with at least two independent channels, and a valve is arranged to control the connection state of the channels, so that one of the channels is in a connection state, and the other channel is in a closed state, or both channels are closed; One of the channels of the outlet of the suspension oil pump and one of the channels of the inlet of the suspension oil pump are in the same connection and closed state, and are a first group of channels; The other channel of the outlet of the suspension oil pump and the other channel of the inlet of the suspension oil pump are in the same connection and closed state, and are a second group of channels; The first group of channels is adjusted to be in a connection state, and the second group of channels is adjusted to be in a closed state, so that the inlet of the suspension oil pump is supplied with oil, and the outlet of the suspension oil pump is discharged, and the forward rotation test of the suspension oil pump is performed; The first group of channels is adjusted to be in a closed state, and the second group of channels is adjusted to be in a connection state, so that the inlet of the suspension oil pump is discharged, and the outlet of the suspension oil pump is supplied with oil, and the reverse rotation test of the suspension oil pump is performed.

2. A method of testing a suspension oil pump as set forth in claim 1, wherein The channel of the inlet of the suspension oil pump of the first group of channels is connected with a hydraulic pump, and the channel of the outlet of the suspension oil pump of the second group of channels is connected with the hydraulic pump.

3. A method of testing a suspension oil pump as set forth in claim 1, wherein The channel of the inlet of the suspension oil pump of the first group of channels is connected with a hydraulic pump, a relief valve, a throttle orifice valve, and an inlet pressure sensor, and the channel of the outlet of the suspension oil pump of the second group of channels is connected with the hydraulic pump, the relief valve, the throttle orifice valve, and the inlet pressure sensor. The channel of the outlet of the suspension oil pump of the first group of channels is provided with an outlet pressure sensor and a flowmeter. The channel of the inlet of the suspension oil pump of the second group of channels is provided with an outlet pressure sensor and a flowmeter.

4. A method of testing a suspension oil pump as defined in claim 1, wherein The channel of the outlet of the suspension oil pump of the first group of channels is connected with a ball valve and an output end of a hydraulic pump in sequence. The channel of the inlet of the suspension oil pump of the second group of channels is connected with a ball valve and an output end of a hydraulic pump in sequence.

5. A method of testing a suspension oil pump as defined in claim 1, wherein The outlet of the suspension oil pump is connected with a three-way joint for connecting two independent channels. The outlet of the suspension oil pump is connected with a three-way joint for connecting two independent channels.

6. A method of testing a suspension oil pump as defined in claim 1, wherein The initial pressure setting step: adjusting the throttle valve, setting the hydraulic pump at a certain speed, and obtaining the required initial pressure; After the initial pressure is set, the initial pressure is stable; The output flow of the hydraulic pump meets the following conditions: the suspension oil pump does not appear to be sucked; through the connection and closing of the first group of channels and the second group of channels, the forward and reverse rotation tests of the suspension oil pump are completed.

7. A hydraulic valve circuit for suspension pump testing, characterized by The outlet of the suspension oil pump is connected with at least two independent channels, and a valve is arranged to control the connection state of the channels, so that one of the channels is in a connection state, and the other channel is in a closed state, or both channels are closed; The inlet of the suspension oil pump is connected with at least two independent channels, and a valve is arranged to control the connection state of the channels, so that one of the channels is in a connection state, and the other channel is in a closed state, or both channels are closed; One of the channels of the outlet of the suspension oil pump and one of the channels of the inlet of the suspension oil pump are in the same connection and closed state, and are a first group of channels; The other channel of the outlet of the suspension oil pump and the other channel of the inlet of the suspension oil pump are in the same connection and closed state, and are a second group of channels; Adjusting the first group of passages to be open, the second group of passages to be closed, so that the inlet of the suspension oil pump is in oil, and the outlet is in oil, to test the forward rotation of the suspension oil pump; Adjusting the first group of passages to be closed, the second group of passages to be open, so that the inlet of the suspension oil pump is in oil, and the outlet is in oil, to test the reverse rotation of the suspension oil pump.

8. A hydraulic valve circuit for testing a suspension oil pump as set forth in claim 7, characterized in that, The passage of the inlet of the suspension oil pump of the first group of passages is connected to the hydraulic pump, and the passage of the outlet of the suspension oil pump of the second group of passages is connected to the hydraulic pump.

9. A hydraulic valve circuit for testing a suspension oil pump as set forth in claim 7, characterized in that, The passage of the inlet of the suspension oil pump of the first group of passages is connected to the hydraulic pump, the overflow valve, the orifice valve, and the inlet pressure sensor, and the passage of the outlet of the suspension oil pump of the second group of passages is connected to the hydraulic pump, the overflow valve, the orifice valve, and the inlet pressure sensor. The passage of the outlet of the suspension oil pump of the first group of passages is provided with an outlet pressure sensor and a flow meter. The passage of the inlet of the suspension oil pump of the second group of passages is provided with an outlet pressure sensor and a flow meter.

10. A hydraulic valve circuit for testing a suspension oil pump as set forth in claim 7, characterized in that, The passage of the outlet of the suspension oil pump of the first group of passages is connected in series to a ball valve and the output end of the hydraulic pump. The passage of the inlet of the suspension oil pump of the second group of passages is connected in series to a ball valve and the output end of the hydraulic pump. The outlet of the suspension oil pump is connected to a three-way joint for connecting two independent passages. The outlet of the suspension oil pump is connected to a three-way joint for connecting two independent passages.

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