CN114320872B - Test system of automotive electronic water pump - Google Patents
Test system of automotive electronic water pump Download PDFInfo
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- CN114320872B CN114320872B CN202111668744.7A CN202111668744A CN114320872B CN 114320872 B CN114320872 B CN 114320872B CN 202111668744 A CN202111668744 A CN 202111668744A CN 114320872 B CN114320872 B CN 114320872B
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- 238000012360 testing method Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001595 flow curve Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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Abstract
The invention discloses a test system of an electronic water pump for a vehicle. Each test loop is provided with an inlet pressure and an outlet pressure for measuring the water pump; a flowmeter for measuring the instantaneous flow in the pipeline; the water pump switch control assembly is connected with the upper computer, controls the circulation system in the pipeline and the closing and opening of the system, the temperature sensor measures the temperature of the cooling liquid, and the water tank provides a water source for the water pump; each loop can adopt two circulation modes, one is pipeline internal circulation, and after the circulation is started and stabilized, water in the pipeline is self-circulated, so that the water in the water tank is not needed to participate in the circulation; the second type is external circulation, and water in the water tank returns to the water tank again through a water pump to complete circulation. The system can select proper circulation to measure according to different conditions, effectively saves the whole vehicle testing resources and simplifies the testing steps.
Description
Technical Field
The invention relates to a water pump testing device, in particular to a testing bench and a testing system of an electronic water pump for a passenger car.
Background
The water pump is the core of an automobile cooling system, is the heart of the whole system, any automobile cannot leave the cooling system, and along with popularization of new energy automobiles, the requirement for the water pump is also increasing.
At present, most of automobiles in the market adopt a water cooling mode, a cooling water pump pumps cooling water into a circulating pipeline, absorbs heat through heating components such as an engine, and then enters a radiator, and the cooling water returns to the water pump after the radiator is cooled, so that the cooling function of the engine is realized by continuously circulating the processes. Because the design of the electronic water pump needs to be improved after repeated tests, the electronic water pump with expected performance can be designed, and therefore, the test of various performances of the electronic water pump is an important link.
Disclosure of Invention
In order to solve the problems in the background art, the invention mainly aims to provide a test bench and a test system of an electronic water pump for an automobile, so as to test various performances of the electronic water pump for the automobile.
In order to achieve the above purpose, the present invention provides the following technical solutions:
1. a test system of an electronic water pump for a vehicle comprises:
the system comprises at least one test loop, wherein each test loop comprises an outlet pressure sensor, an inlet pressure sensor, a circulation switching valve, a flow control electric control valve, a temperature sensor and a flowmeter; the outlet of the water pump to be tested is connected with the inlet of the flow control electric control valve through a pipeline, an outlet pressure sensor, a flowmeter and a temperature sensor are arranged on the pipeline between the water pump to be tested and the flow control electric control valve, the outlet of the flow control electric control valve is connected with the inlet end of the circulation switching valve, one outlet end of the circulation switching valve is connected with the inlet of the water pump to be tested, and an inlet pressure sensor is arranged on the pipeline between the water pump to be tested and the circulation switching valve.
The test system is mainly used for measuring hydraulic parameters of the water pump to be tested, such as pressure, flow, lift and the like.
The device also comprises an outlet valve, a water tank and a tee joint; the outlet of the flow control electric control valve and the inlet end of the circulation switching valve in each test loop are respectively connected to two ends of the tee joint, the remaining end of the tee joint is connected with the inlet of the water tank, and the outlet of the water tank is connected to a pipeline between the water pump to be tested and the circulation switching valve in each test loop through the outlet valve.
The size of the outlet of the water tank is adjustable.
The water tank is higher than the pipeline arrangement among the water pump to be tested, the circulating switching valve and the flow control electric control valve.
The system also comprises an upper computer, wherein the outlet pressure sensor, the inlet pressure sensor, the temperature sensor, the flowmeter and the water pump to be tested are all connected to the upper computer, and meanwhile, the upper computer is respectively connected to the flow control electric control valve and the circulation switching valve.
The outlet valve of the outlet of the water tank is an adjustable ball valve, and the proper opening degree can be selected according to the requirement.
The outlet valve outlet of the water tank outlet is split, and the water tank outlet can be connected with a proper caliber according to the requirement.
The upper computer receives the water outlet temperature of the water pump to be detected, which is acquired by the temperature sensor, and the following judgment is carried out:
if the water outlet temperature is higher than the preset temperature threshold, the rotation speed of the water pump is lower, and the upper computer controls the circulation switching valve to be closed, so that water flowing out of the outlet of the water pump to be tested passes through the water tank and then returns to the inlet of the water pump to be tested, and a large circulation is formed;
if the temperature of the water outlet is not higher than the preset temperature threshold, the rotation speed of the water pump is higher, and the upper computer controls the circulation switching valve to be opened, so that water flowing out of the outlet of the water pump to be tested does not pass through the water tank and only returns to the inlet of the water pump to be tested through the pipeline, thereby forming 'small circulation'.
2. A vehicle electronic water pump optimization control method based on a test system is characterized by comprising the following steps of:
s1, respectively collecting outlet pressure of a water pump to be tested and inlet pressure of the water pump to be tested through an outlet pressure sensor and an inlet pressure sensor, and further processing to obtain the lift, hydraulic power and efficiency of the water pump to be tested;
s2, respectively collecting the flow of the water pump to be tested through a flowmeter;
s3, adjusting the flow passing through the water pump to be tested through the flow control electric control valve, repeating the steps S1-S2 under different flows, further processing to obtain the flow, the lift and the efficiency of the water pump to be tested, and further drawing a relation curve between the lift and the flow and a relation curve between the efficiency and the flow;
and S4, finding an optimal operation point on the curve according to the obtained relation curve between the lift and the flow and the relation curve between the efficiency and the flow, and controlling the water pump to work in the state of the operation point, thereby improving the efficiency and realizing accurate control.
The step S4 specifically includes: firstly, an efficiency maximum point is found in a relation curve between efficiency and flow and is used as a preliminary operation point, the flow corresponding to the preliminary operation point is substituted into the relation curve between the lift and the flow to obtain a corresponding lift, whether the lift meets control requirements or not is judged, and the flow corresponding to the lift is adjusted according to the control requirements, so that the flow corresponding to the maximum efficiency can be found under the condition of meeting the lift requirements and is used as the flow of an optimal operation point, the flow is applied to a flow valve of a water pump to be tested for control, the water pump to be tested works at the optimal operation point, and the efficiency is improved.
In the invention, two pressure sensors are arranged in each loop system and are respectively used for measuring the inlet pressure and the outlet pressure of the water pump so as to obtain the inlet-outlet pressure difference of the water pump; one for each loop flow meter to measure the instantaneous flow in the pipeline; the water pump switch control assembly is connected with the upper computer, controls the circulation system in the pipeline and the closing and opening of the system, the temperature sensor measures the temperature of the cooling liquid, and the water tank provides a water source for the water pump.
In the invention, two pressure sensors are arranged in each loop system and are respectively used for measuring the inlet pressure and the outlet pressure of the water pump so as to obtain the inlet-outlet pressure difference of the water pump; one for each loop flow meter to measure the instantaneous flow in the pipeline; the water pump switch control assembly is connected with the upper computer, controls the circulation system in the pipeline and the closing and opening of the system, the temperature sensor measures the temperature of the cooling liquid, and the water tank provides a water source for the water pump. Each loop can adopt two circulation modes, one is pipeline internal circulation, and after the circulation is started and stabilized, water in the pipeline is self-circulated, so that the water in the water tank is not needed to participate in the circulation; the second type is external circulation, and water in the water tank returns to the water tank again through a water pump to complete circulation.
The test system can select proper circulation to measure according to different conditions, effectively saves the whole vehicle test resources and simplifies the test steps.
The beneficial effects of the invention are as follows:
the circulation loop can adopt two circulation modes, one circulation mode is pipeline internal circulation, and after the circulation is started and stabilized, water in the pipeline is self-circulated, so that the water in the water tank is not needed to participate in the circulation; the second type is external circulation, and water in the water tank returns to the water tank again through a water pump to complete circulation.
The test system can select proper circulation to measure according to different conditions, effectively saves the whole vehicle test resources and simplifies the test steps.
According to the invention, two test functions can be realized simultaneously through the test bench/system, accurate measurement under different flow rates is realized, energy conservation is improved, and more energy-saving control is realized.
Drawings
FIG. 1 is a front view angle block diagram of the overall structure of the present invention;
FIG. 2 is a rear view perspective block diagram of the overall structure of the present invention;
FIG. 3 is a single cycle partial structure diagram of the present invention;
FIG. 4 is a schematic view of the cycle structure of the present invention.
In the figure: the water pump comprises an external integral frame 1, a third water pump to be tested 2, a water pump inlet pipeline 3, a first water pump to be tested 4, a second water pump to be tested 5, an outlet pressure sensor 6, a turbine flowmeter front end pipeline 7, a turbine flowmeter 8, a temperature sensor 9, a water tank 10, a water tank outlet valve 11 and a water tank outlet shunt 12; the first flow control electric control valve 13, the bottom universal wheel 14, the second flow control electric control valve 15, the first water receiving tank inlet three-way joint 16, the second water receiving tank inlet three-way joint 17, the third water receiving tank inlet three-way joint 18, the first circulation switching valve 19, the second circulation switching valve 20, the third circulation switching valve 21, the first water receiving tank outlet three-way joint 22, the second water receiving tank outlet three-way joint 23, the third water receiving tank outlet three-way joint 24, the first inlet pressure sensor 25, the second inlet pressure sensor 26, the third inlet pressure sensor 27, the circulation loop water receiving tank outlet three-way joint 28, the three-way joint upper part pipeline 29, the circulation switching valve 30, the water receiving tank inlet three-way joint 31 and the three-way joint upper part pipeline 32.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and the detailed operation thereof.
As shown in fig. 4, the system includes at least one test circuit, each test circuit including an outlet pressure sensor, an inlet pressure sensor, a circulation switch valve, a flow control electrically controlled valve, a temperature sensor, a flow meter, an outlet valve, a water tank, and a tee; the outlet of the water pump to be tested is connected with the inlet of the flow control electric control valve through a pipeline, an outlet pressure sensor, a flowmeter and a temperature sensor are arranged on the pipeline between the water pump to be tested and the flow control electric control valve, the outlet of the flow control electric control valve is connected with the inlet end of the circulation switching valve, one outlet end of the circulation switching valve is connected with the inlet of the water pump to be tested, and an inlet pressure sensor is arranged on the pipeline between the water pump to be tested and the circulation switching valve; the outlet of the flow control electric control valve and the inlet end of the circulation switching valve in each test loop are respectively connected to two ends of the tee joint, the remaining end of the tee joint is connected with the inlet of the water tank, and the outlet of the water tank is connected to a pipeline between the water pump to be tested and the circulation switching valve in each test loop through the outlet valve.
The circulation loop is provided with a temperature measuring component and is connected with the upper computer, the circulation switching valve is connected with the upper computer, and the upper computer controls the valve to open and close and records data.
The circulation switching valve can switch the circulation direction and the circulation pipeline, so that the circulation switching valve is switched to be communicated between the flow control electric control valve and the water tank or between the flow control electric control valve and the water pump to be tested. When the temperature is higher than a set value, the upper computer controls the circulation switching valve to switch from 'small circulation' communicated between the flow control electric control valve and the water pump to be tested to 'large circulation' communicated between the flow control electric control valve and the water tank.
The water tank is higher than the pipeline arrangement among the water pump to be tested, the circulating switching valve and the flow control electric control valve.
The system also comprises an upper computer, wherein the outlet pressure sensor, the inlet pressure sensor, the temperature sensor, the flowmeter and the water pump to be tested are all connected to the upper computer, and meanwhile, the upper computer is respectively connected to the flow control electric control valve and the circulation switching valve.
The upper computer receives the water outlet temperature and the water flow of the water pump to be tested and respectively collects the water outlet temperature and the water flow of the water pump to be tested, and then the work of the flow control electric control valve and the circulation switching valve is controlled.
The upper computer receives the outlet pressure sensor and the inlet pressure sensor to respectively acquire the outlet pressure of the water pump to be tested and the inlet pressure of the water pump to be tested, and further processes the outlet pressure sensor and the inlet pressure sensor to obtain the lift, hydraulic power and efficiency of the water pump to be tested.
Three circulation pipelines with different inner diameters are arranged in specific implementation.
As shown in fig. 1 and 2, the device comprises an external integral frame 1, wherein bottom universal wheels 14 are arranged at four corners of the external integral frame 1, and the external integral frame can be moved to a proper position for experimental measurement according to requirements.
The upper part of the external integral frame 1 is provided with a water tank 10, the first water pump to be tested 4, the second water pump to be tested 5 and the third water pump to be tested 2 are all arranged at the bottom of the external integral frame 1, and the water tank 10 is positioned above the first water pump to be tested 4, the second water pump to be tested 5 and the third water pump to be tested 2;
the outlet of the first water pump to be tested 4 is provided with a pressure sensor 6, the outlet of the first water pump to be tested 4 is connected to the inlet of a first flow control electric control valve 13 through a turbine flowmeter front end pipeline 7 with a turbine flowmeter 8 and a temperature sensor 9, the outlet of the first flow control electric control valve 13 is communicated with the first end of a first water receiving tank inlet three-way interface 16, the second end of the first water receiving tank inlet three-way interface 16 is communicated with the top of a water tank 10, the third end of the first water receiving tank inlet three-way interface 16 is communicated with one end of a first circulating switching valve 19, the other end of the first circulating switching valve 19 is communicated with the first end of a first water receiving tank outlet three-way interface 22, the second end of the first water receiving tank outlet three-way interface 22 is communicated with the bottom of the water tank 10, the third end of the first water receiving tank outlet three-way interface 22 is communicated with the inlet of the first water pump to be tested 4 through a water pump inlet pipeline 3, and the inlet side of the first water pump to be tested 4 is provided with a first inlet pressure sensor 25;
the outlet of the second water pump 5 to be tested is provided with a pressure sensor 6, the outlet of the second water pump 5 to be tested is connected to the inlet of a second flow control electric control valve 15 through a turbine flowmeter front end pipeline 7 with a turbine flowmeter 8 and a temperature sensor 9, the outlet of the second flow control electric control valve 15 is communicated with the first end of a second water receiving tank inlet three-way joint 17, the second end of the second water receiving tank inlet three-way joint 17 is communicated with the top of a water tank 10, the third end of the second water receiving tank inlet three-way joint 17 is communicated with one end of a second circulating switching valve 20, the other end of the second circulating switching valve 20 is communicated with the first end of a second water receiving tank outlet three-way joint 23, the second end of the second water receiving tank outlet three-way joint 23 is communicated with the bottom of the water tank 10, the third end of the second water receiving tank outlet three-way joint 23 is communicated with the inlet of the second water pump 5 to be tested through a water pump inlet pipeline 3, and the inlet side of the second water pump 5 to be tested is provided with a second inlet pressure sensor 26;
the outlet of the third water pump 2 to be tested is provided with a pressure sensor 6, the outlet of the third water pump 2 to be tested is connected to the inlet of a third flow control electric control valve through a turbine flowmeter front end pipeline 7 with a turbine flowmeter 8 and a temperature sensor 9, the outlet of the third flow control electric control valve is communicated with the first end of a third water receiving tank inlet three-way joint 18, the second end of the third water receiving tank inlet three-way joint 18 is communicated with the top of the water tank 10, the third end of the third water receiving tank inlet three-way joint 18 is communicated with one end of a second circulating switching valve 20, the other end of the second circulating switching valve 20 is communicated with the first end of a third water receiving tank outlet three-way joint 24, the second end of the third water receiving tank outlet three-way joint 24 is communicated with the bottom of the water tank 10, the third end of the third water receiving tank outlet three-way joint 24 is communicated with the inlet of the third water pump 2 to be tested through a water pump inlet pipeline 3, and the inlet side of the third water pump 2 to be tested is provided with a third inlet pressure sensor 27.
In specific implementation, the outlet at the bottom of the water tank 10 is connected with the water tank outlet valve 11, the outlet of the water tank outlet valve 11 is divided into three paths with different inner diameters through the water tank outlet diverter 12, the three paths are respectively connected with the second ends of the first water receiving tank outlet three-way interface 22, the second water receiving tank outlet three-way interface 23 and the third water receiving tank outlet three-way interface 24, and simultaneously, the outlet at the top of the water tank 10 is respectively connected with the second ends of the first water receiving tank inlet three-way interface 16, the second water receiving tank inlet three-way interface 17 and the third water receiving tank inlet three-way interface 18.
Therefore, the specific multi-path arrangement can be used for simultaneously measuring a plurality of water pumps, and the measuring efficiency is greatly improved. Each loop of the outlet valve of the water tank is provided with an independent switch, so that other pipelines are prevented from influencing measurement.
The second water receiving tank inlet three-way joint 17, the first circulation switching valve 19, the first water receiving tank outlet three-way joint 22 and the first inlet pressure sensor 25 are all 25mm in caliber; the first water receiving tank inlet three-way joint 16, the second circulation switching valve 20, the second water receiving tank outlet three-way joint 23 and the second inlet pressure sensor 26 are all 38mm caliber; the third water receiving tank inlet three-way joint 18, the third circulation switching valve 21, the third water receiving tank outlet three-way joint 24 and the third inlet pressure sensor 27 are all 19mm caliber.
As shown in figure 3, the bottom of the water tank is communicated with the first end of a water tank outlet tee 28 through a tee joint upper part pipeline 29, the second end of the water tank outlet tee 28 is connected to the inlet of a water pump to be tested, the outlet of the water pump to be tested is connected to the first end of a water tank inlet tee joint 31 through a pipeline with a flowmeter and a temperature sensor, the second end of the water tank inlet tee joint 31 is connected to the top of the water tank through a tee joint upper part pipeline 32, and the third end of the water tank inlet tee joint 31 is communicated with the third end of a circulation switching valve 30 and the water tank outlet tee 28 of the circulation loop.
The circulating loop is provided with the circulating switching valve, and when the circulating switching valve is opened, the circulating loop in which the circulating switching valve is positioned is regarded as a small circulating loop of the automobile cooling system, namely, water in a pipeline participates in circulation and does not pass through the water tank; when the circulation switching valve is closed, the circulation loop can be regarded as a 'large circulation' loop of the automobile cooling system, and water in the pipeline flows back to the water tank to participate in circulation.
Specifically, the upper computer receives the water outlet temperature of the water pump to be detected, which is acquired by the temperature sensor, and carries out the following judgment:
if the water outlet temperature is higher than the preset temperature threshold, the rotation speed of the water pump is lower, and the upper computer controls the circulation switching valve to be closed, so that water flowing out of the outlet of the water pump to be tested passes through the water tank and then returns to the inlet of the water pump to be tested, and a large circulation is formed;
if the temperature of the water outlet is not higher than the preset temperature threshold, the rotation speed of the water pump is higher, the upper computer controls the circulation switching valve to be opened, and as the water tank is higher than the pipeline where the water pump to be tested is located, water flows through the circulation switching valve and does not pass through the water tank, so that water flowing out of the outlet of the water pump to be tested does not pass through the water tank and only returns to the inlet of the water pump to be tested through the pipeline, thereby forming small circulation.
A circulation switching valve 30 for changing the circulation line of the liquid in the whole pipeline.
When the circulation switching valve 30 is opened, water in the water tank can be internally circulated through the water pump and does not return to the water tank, the circulation mode forms a small circulation system of cooling water of the automobile, when the automobile is just started or is started soon, and the requirement for heat dissipation is not high, the energy is reasonably utilized to achieve the most suitable heat dissipation requirement, the small circulation mode is adopted, and a small amount of water in the pipeline is internally circulated, so that the purpose of heat dissipation is achieved;
when the temperature sensor detects that the temperature of the cooling liquid reaches a set value, the upper computer controls the circulation switching valve 30 to be closed, the circulation switching valve is switched to an external circulation mode, and water in the water tank returns to the water tank again for circulation through a water pump, a pressure sensor, a flow sensor and other components, so that a large circulation system is formed.
The water pump test bench system is used for testing various performances of the water pump:
after the caliber of the water pump to be tested is measured, the water pump is arranged in a proper circulation pipeline, three different calibers can be selected in the pipeline loop, namely, the circulation loop with the caliber of 38mm, the circulation loop with the caliber of 25mm and the circulation loop with the caliber of 19mm are respectively arranged, and the circulation loop is shown in a circulation schematic diagram 3.
After the water pump is installed, checking the loop, and ensuring whether all connectors are connected firmly normally or not, and putting the circulation switching valve and the circulation switching valve in a complete opening state;
further, an outlet valve at the outlet of the water tank is opened, so that a water source in the water tank can flow into the circulating pipeline, and the pipeline is fully filled with the water source, and air in the pipeline is emptied;
further, the voltage of the direct current power supply is modulated to a proper voltage value so as to be convenient for matching with the rated voltage of the water pump, so that the water pump can normally operate under safe voltage;
furthermore, a power connection wire of the water pump is connected into the junction box, and the water pump power connection wire is in close contact with the inner wire of the junction box, so that the operation fault of the water pump caused by poor contact is prevented;
further, the power supply is started to enable the water pump to initially run, residual air in the pipeline is exhausted, errors caused by the existence of air in the pipeline are reduced, and experimental data are affected;
further, the water pump is turned off, whether residual air and a pipeline are sealed normally or not is checked, whether water leakage phenomenon exists at the joint or not is judged, and if all the water leakage phenomena are normal, the water pump parameters can be prepared to be measured;
further, when the power supply water pump is started to normally operate, the circulation switching valve is in an open state, the whole loop is in internal circulation, the inlet pressure and the outlet pressure of the water pump are controlled to be the inlet pressure P through the inlet pressure sensor and the outlet pressure sensor in And outlet pressure P out Transmitting the data to an upper computer for recording;
transmitting the measured instantaneous flow value to a computer through a turbine flow sensor for recording and analysis;
the head of an electronic water pump is another important parameter that characterizes the performance of an electronic water pump, and can be expressed in terms of the height of the liquid delivered by the pump, which corresponds to the increase in energy per unit weight of liquid pumped by the pump from the inlet to the outlet of the pump, i.e. the effective energy obtained by the pump per 1kg of liquid, expressed in H, in units N.m/n=m.
The head H is calculated according to the following formula:
wherein P is out 、P in The unit is Kpa which is the pressure of the water outlet and the pressure of the water inlet of the electronic water pump; ρ is the density of the liquid in the electronic water pump during the test, g is the gravitational acceleration.
The hydraulic power P of the water pump is calculated according to the following formula, namely the useful power P consumed by the transmission liquid when the water pump works:
P＝H×Q×g×ρ (2)
wherein Q represents the flow rate collected by the flowmeter;
the water pump efficiency η is calculated according to the following formula:
wherein U represents the input voltage of the electronic water pump, and I represents the input current of the electronic water pump;
further, in order to obtain the performance of each parameter of the water pump under different flow conditions, the opening degree of the flow control electric control valve is adjusted through the upper computer, and the valve opening degree adjustment is set from 100%,90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% and 10% so as to obtain each performance parameter of the water pump under each different flow, so that a relation curve between the lift and the flow and a relation curve between the efficiency and the flow are drawn.
Then, after the data acquisition of the water pump internal circulation loop is finished, the upper computer is controlled to gradually and completely open the opening of the flow electric control valve, then the water temperature is simulated to rise, the temperature reaches the set value of circulation switching, the upper computer controls the circulation switching valve to be in a closed state, water in the pipeline flows into the water tank again after passing through the flow electric control valve, then flows into the inlet pressure collector of the water pump from the water tank to participate in the circulation of the whole loop, and the water pump circulation is switched from an internal circulation mode to an external circulation mode.
And further uploading data to an upper computer for recording and analyzing by an inlet pressure sensor, an outlet pressure sensor and a flow sensor of the water pump, and repeating the operation of the previous step to obtain a lift and flow curve and an efficiency and flow curve of the water pump in the circulating state.
According to the specific implementation of the large circulation and the small circulation for simulating the cooling in the automobile cooling system, the water pump is enabled to more accord with the running condition under the actual condition in the process of testing various hydraulic parameters of the water pump, the obtained relationship curve between the lift and the flow under two different conditions and the relationship curve between the efficiency and the flow are combined and analyzed, the operation optimal point of the efficiency and the lift of the water pump is sought for each state on the curve, the water pump is controlled to work in the state of the optimal operation point, the efficiency is improved, and the accurate control is realized.
Claims (7)
1. A test system of an electronic water pump for a vehicle is characterized in that: the system comprises at least one test loop, wherein each test loop comprises an outlet pressure sensor, an inlet pressure sensor, a circulation switching valve, a flow control electric control valve, a temperature sensor and a flowmeter;
the outlet of the water pump to be tested is connected with the inlet of the flow control electric control valve through a pipeline, an outlet pressure sensor, a flowmeter and a temperature sensor are arranged on the pipeline between the water pump to be tested and the flow control electric control valve, the outlet of the flow control electric control valve is connected with the inlet end of the circulation switching valve, one outlet end of the circulation switching valve is connected with the inlet of the water pump to be tested, and an inlet pressure sensor is arranged on the pipeline between the water pump to be tested and the circulation switching valve;
the bottom of the water tank is communicated with the first end of a water tank outlet tee joint through a tee joint upper part pipeline communicated with the water tank outlet, the second end of the water tank outlet tee joint is connected to the inlet of a water pump to be tested, the outlet of the water pump to be tested is connected to the first end of a water tank inlet tee joint through a pipeline with a flowmeter and a temperature sensor, the second end of the water tank inlet tee joint is connected to the top of the water tank through a tee joint upper part pipeline, the third end of the water tank inlet tee joint is communicated with a circulation switching valve, and the circulation switching valve is communicated with the third end of the water tank outlet tee joint;
each test loop adopts two circulation modes, one is pipeline internal circulation, and after the circulation is started and stabilized, water in the pipeline is self-circulated, so that the water in the water tank is not needed to participate in the circulation; the second is external circulation, water in the water tank returns to the water tank again through the water pump, and the circulation is completed;
the test system performs optimal control and test of the vehicle electronic water pump according to the following method:
s1, respectively collecting outlet pressure of a water pump to be tested and inlet pressure of the water pump to be tested through an outlet pressure sensor and an inlet pressure sensor, and further processing to obtain the lift, hydraulic power and efficiency of the water pump to be tested;
s2, respectively collecting the flow of the water pump to be tested through a flowmeter;
s3, adjusting the flow passing through the water pump to be tested through the flow control electric control valve, repeating the steps S1-S2 under different flows, further processing to obtain the flow, the lift and the efficiency of the water pump to be tested, and further drawing a relation curve between the lift and the flow and a relation curve between the efficiency and the flow;
s4, finding an optimal operation point on the curve according to the obtained relation curve between the lift and the flow and the relation curve between the efficiency and the flow, and controlling the water pump to work in the state of the operation point, so that the efficiency is improved, and accurate control is realized;
the step S4 specifically includes: firstly, an efficiency maximum point is found in a relation curve between efficiency and flow and is used as a preliminary operation point, the flow corresponding to the preliminary operation point is substituted into the relation curve between the lift and the flow to obtain a corresponding lift, whether the lift meets control requirements or not is judged, and the flow corresponding to the lift is adjusted according to the control requirements, so that the flow corresponding to the maximum efficiency can be found under the condition of meeting the lift requirements and is used as the flow of an optimal operation point, and the flow is applied to a flow control electric control valve of a water pump to be tested to control, so that the water pump to be tested works at the optimal operation point.
2. The test system for an electronic water pump for vehicles according to claim 1, wherein:
the water tank outlet valve is also included; the outlet of the flow control electric control valve and the inlet end of the circulation switching valve in each test loop are respectively connected to two ends of the three-way joint connected with the inlet of the water tank, the remaining end of the three-way joint connected with the inlet of the water tank, and the outlet of the water tank is connected to a pipeline between the water pump to be tested and the circulation switching valve in each test loop through the valve at the outlet of the water tank.
3. The test system for an electronic water pump for vehicles according to claim 1, wherein:
the water tank is higher than the pipeline arrangement among the water pump to be tested, the circulating switching valve and the flow control electric control valve.
4. The test system for an electronic water pump for vehicles according to claim 1, wherein:
the system also comprises an upper computer, wherein the outlet pressure sensor, the inlet pressure sensor, the temperature sensor, the flowmeter and the water pump to be tested are all connected to the upper computer, and meanwhile, the upper computer is respectively connected to the flow control electric control valve and the circulation switching valve.
5. The test system for an electronic water pump for vehicles according to claim 1, wherein:
the valve at the outlet of the water tank is an adjustable ball valve.
6. The test system for an electronic water pump for vehicles according to claim 1, wherein:
the water tank outlet valve at the water tank outlet is used for splitting at the outlet.
7. The test system for an electronic water pump for vehicles according to claim 4, wherein:
the upper computer receives the water outlet temperature of the water pump to be detected, which is acquired by the temperature sensor, and the following judgment is carried out:
if the water outlet temperature is higher than the preset temperature threshold, the rotation speed of the water pump is lower, and the upper computer controls the circulation switching valve to be closed, so that water flowing out of the outlet of the water pump to be tested passes through the water tank and then returns to the inlet of the water pump to be tested, and a large circulation is formed;
if the temperature of the water outlet is not higher than the preset temperature threshold, the rotation speed of the water pump is higher, and the upper computer controls the circulation switching valve to be opened, so that water flowing out of the outlet of the water pump to be tested does not pass through the water tank and only returns to the inlet of the water pump to be tested through the pipeline, thereby forming 'small circulation'.
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