Method and device for measuring working efficiency of fuel motor

Abstract

The present invention relates to the field of aerospace technology, and specifically discloses a method and device for measuring the working efficiency of a fuel motor. The method is implemented based on the working efficiency measuring device of the fuel motor, and the working efficiency measuring device of the fuel motor includes: a fuel tank assembly provided with a hollow chamber, the hollow chamber is divided into a first chamber and a second chamber, and both are filled with fuel of a preset temperature value; the working efficiency measuring device of the fuel motor also includes a controller, and a loading motor electrically connected to the controller, a fuel motor to be tested, a load simulation component, a speed detector, a torque sensor, and a resistance simulation circuit; the method includes three steps of input power calculation, output power calculation, and working efficiency calculation. The present invention not only simulates the actual working environment of the fuel motor, but also simulates the resistance of the impeller to the fuel motor under the real environment, thereby improving the accuracy of the working efficiency test of the fuel motor.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and in particular to a method and device for measuring the working efficiency of a fuel motor. Background Art

[0002] In the aerospace field, fuel motors drive the impeller to rotate in a low temperature environment (-55℃~0℃) to supply fuel to the engine. Compared with the normal temperature environment, their performance and work efficiency will change. Therefore, after the development of the fuel motor is completed, it is necessary to conduct simulation tests on it to detect whether its work efficiency meets the requirements. The more common method for measuring the motor's work efficiency is to obtain the voltage and current input by the controller to the motor under test to measure the input power of the motor under test, and then measure the output power of the motor under test through the external load and torque sensor of the motor under test. The ratio of input power to output power is the work efficiency. For example, the invention patent with publication number CN107102262A, entitled "A linear motor performance test device and its control method", includes a load motor, a DC power supply module, a first DC-AC conversion module, a second DC-AC conversion module, a first current monitoring module, a second current monitoring module, a first position monitoring module, a second position monitoring module and a control module. The first current monitoring module is used to monitor and output the electrical terminal current of the load motor, the second current monitoring module is used to monitor and output the electrical terminal current of the motor under test, the first position monitoring module is used to monitor the position of the load motor and output the actual measured speed of the load motor according to the position of the load motor, the second position monitoring module is used to monitor the position of the motor under test and output the actual measured speed of the motor under test according to the position of the motor under test, and the control module outputs a corresponding control signal according to the monitoring result to realize the test of the motor performance.

[0003] However, the actual working environment of the fuel motor is in the fuel, and the torque sensor is easily damaged when placed in the fuel. Therefore, the performance test method of the fuel motor is different from that of the ordinary motor, and the motor performance relationship reflected by the measured parameters is also different. Therefore, the measurement method of the existing technology cannot meet the measurement of the working efficiency of the fuel motor. Based on the above problems, how to realize the measurement of the working efficiency of the fuel motor is an urgent problem to be solved. Summary of the invention

[0004] In view of the technical problems in the prior art, the present invention provides a method and device for measuring the working efficiency of a fuel motor.

[0005] In a first aspect, a method for measuring the working efficiency of a fuel motor of the present invention is implemented based on a fuel motor working efficiency measuring device, wherein the fuel motor working efficiency measuring device comprises: a fuel tank assembly provided with a hollow chamber, wherein the hollow chamber is divided into a first chamber and a second chamber, and both are filled with fuel of a preset temperature value; the fuel motor working efficiency measuring device also comprises a controller, and a loading motor electrically connected to the controller, a fuel motor to be measured, a load simulation component, a speed detector, a torque sensor, and a resistance simulation circuit, wherein the speed detector is used to detect the speed of the loading motor and send it to the controller; the method comprises:

[0006] Input power calculation: the loading motor and the tested fuel motor are placed in the first chamber and the second chamber respectively, and the rotating shafts of the tested fuel motor and the loading motor are coaxially fixedly connected; the controller provides a driving voltage U and a driving current I to the tested fuel motor to control the rotation of the tested fuel motor; the resistance simulation circuit is connected to the winding of the loading motor to form a path, and the controller obtains the induced current i of the resistance simulation circuit when the tested fuel motor rotates; the speed detector detects the speed of the loading motor to obtain the speed n; the controller generates a first numerical relationship table according to the speed n and the induced current i, and calculates the input power W according to the driving voltage U and the driving current I 入 ;

[0007] Output power calculation: the loading motor and the load simulation component are coaxially fixedly connected through a loading shaft, and the torque sensor is installed on the loading shaft to measure the torque value T of the loading shaft; the controller provides a driving current I1 to the loading motor so that the speed of the loading motor is n1, and the induced current value corresponding to the speed n1 is determined to be i1 according to the first numerical relationship table; the controller provides a driving current with a current value of i1 to the load simulation component so that the load simulation component applies a load to the loading motor, and the controller obtains the torque value T1 measured by the torque sensor; according to the numerical range of the speed n in the first numerical relationship table, the value of the speed n1 is adjusted and the above steps are repeated, and the controller generates a second numerical relationship table according to the speed n and the torque value T, and calculates the output power W according to the speed n and the torque value T. 出 ;

[0008] Working efficiency calculation: According to the input power W 入 and the output power W 出 The working efficiency of the tested fuel-powered motor is calculated.

[0009] Furthermore, the input power W 入 The calculation method is: Input power W 入=1.732*U*I*cosφ; where cosφ is the power factor; the output power W 出 The calculation method is: Output power W 出 = T*n / 9.55.

[0010] Furthermore, when calculating the input power, the controller calculates the first resistance coefficient according to the first numerical relationship table, and then calculates the input power W by combining the first resistance coefficient with the driving voltage U and the driving current I. 入 .

[0011] Furthermore, when calculating the output power, the controller calculates the second resistance coefficient according to the second numerical relationship table, and then calculates the output power W by combining the second resistance coefficient, the speed n, and the torque value T. 出 .

[0012] Furthermore, the input power W 入 The calculation method is: Input power W 入 =K1*1.732*U*I*cosφ; the output power W 出 The calculation method is: Output power W 出 =K2* T*n / 9.55; wherein cosφ is the power factor, K1 is the first resistance coefficient, and K2 is the second resistance coefficient.

[0013] In a second aspect, the present invention provides a fuel motor working efficiency measuring device, the fuel motor working efficiency measuring device comprising: a fuel tank assembly provided with a hollow chamber, the hollow chamber being divided into a first chamber and a second chamber, both of which are filled with fuel of a preset temperature value; the fuel motor working efficiency measuring device also comprises a controller, and a loading motor electrically connected to the controller, a fuel motor to be tested, a load simulation component, a speed detector, a torque sensor, and a resistance simulation circuit, the speed detector being used to detect the speed of the loading motor and send it to the controller;

[0014] The fuel motor working efficiency measuring device is used to implement the above-mentioned fuel motor working efficiency measuring method.

[0015] Furthermore, the fuel tank assembly includes a fuel tank having the hollow chamber, and also includes a low-temperature environment box that forms a first preset temperature environment, a temperature detector for detecting the temperature of the fuel, and a fuel tank temperature controller electrically connected to the low-temperature environment box and the temperature detector; the fuel tank is placed in the low-temperature environment box, the temperature detector is used to measure the temperature of the fuel, and the fuel tank temperature controller is used to control the low-temperature environment box according to the temperature detection value of the temperature detector, so that the fuel in the fuel tank reaches a preset temperature value.

[0016] Furthermore, the fuel tank assembly also includes a heater electrically connected to the fuel tank temperature controller, and the heater is arranged on the inner wall of the fuel tank for heating the fuel.

[0017] Furthermore, the rotating shaft of the tested fuel motor is coaxially installed in the hollow rotating shaft of the loading motor through an adapter sleeve, and the adapter sleeve can move along the axis of the hollow rotating shaft.

[0018] Furthermore, the fuel tank assembly also includes a motor mounting frame fixed in the fuel tank, and the motor mounting frame includes a frame beam fixed to the bottom of the fuel tank, a base plate horizontally installed on the frame beam, and a vertical plate vertically fixed in the middle of the base plate; when the input power is calculated, the loading motor and the tested fuel motor are respectively located on both sides of the vertical plate, and the vertical plate divides the hollow chamber of the fuel tank into the first chamber and the second chamber.

[0019] The method and device for measuring the working efficiency of a fuel motor of the present invention are implemented based on the working efficiency measuring device of a fuel motor and have the following beneficial effects:

[0020] (1) Before calculating the input power, the loading motor and the tested fuel motor are respectively placed in the first chamber and the second chamber filled with fuel of a preset temperature value to simulate the actual working environment of the fuel motor; the rotating shafts of the tested fuel motor and the loading motor are coaxially fixedly connected, and the resistance simulation circuit is connected to the winding of the loading motor to form a path. When the controller provides a driving voltage U and a driving current I to the tested fuel motor to control the rotation of the tested fuel motor, the loading motor is driven to rotate and thus an induced electromotive force is generated, so that the resistance simulation circuit generates an induced current i, which inhibits the rotation of the tested fuel motor to simulate the resistance of the impeller to the fuel motor under the real environment. Therefore, the present invention simulates the real working environment of the fuel motor, thereby improving the accuracy of the fuel motor working efficiency test;

[0021] (2) During the output power calculation process, after the loading motor and the load simulation component are coaxially fixedly connected through the loading shaft, the controller determines the induced current value i corresponding to the speed n according to the first numerical relationship table generated by the speed n and the induced current i during the input power calculation process, and then provides the driving current i to the load simulation component so that the load simulation component applies a load to the loading motor and obtains the torque value T, thereby generating a second numerical relationship table according to the speed n and the torque value T to calculate the output power. Therefore, the present invention does not need to place the torque sensor in the fuel for measurement, but uses the first numerical relationship table obtained during the input power calculation process to measure the output power in an external non-fuel environment, which not only introduces the influence of the real working environment of the fuel motor, but also ensures the accuracy of the test. It is the most suitable solution for fuel motor performance testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a fuel motor working efficiency measuring device according to an embodiment of the present invention (I);

[0024] Figure 2 A schematic diagram of the structure of a fuel motor working efficiency measuring device according to an embodiment of the present invention (II);

[0025] Figure 3 A schematic diagram of the structure of a fuel motor working efficiency measuring device according to an embodiment of the present invention (III);

[0026] Among them, 10-controller, 20-loading motor, 30-tested fuel motor, 40-load simulation component, 50-speed detector, 60-torque sensor, 70-resistance simulation circuit, 80-loading shaft, 90-fuel tank component, 901-fuel tank, 902-heater, 903-motor mounting frame, 9031-beam, 9032-base plate, 9033-vertical plate. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0028] The embodiment of the present invention discloses a method for measuring the working efficiency of a fuel motor. The method is implemented based on a device for measuring the working efficiency of a fuel motor. Figures 1 to 3 As shown, the fuel motor working efficiency measuring device includes: a fuel tank assembly provided with a hollow chamber, the hollow chamber is divided into a first chamber and a second chamber, and both are filled with fuel of a preset temperature value; the fuel motor working efficiency measuring device also includes a controller 10, and a loading motor 20 electrically connected to the controller 10, a fuel motor 30 to be tested, a load simulation component 40, a speed detector 50, a torque sensor 60, and a resistance simulation circuit 70, the speed detector 50 is used to detect the speed of the loading motor 20 and send it to the controller 10; the method includes:

[0029] Step 1: Input power calculation:

[0030] The loading motor 20 and the tested fuel motor 30 are placed in the first chamber and the second chamber respectively, and the rotating shafts of the tested fuel motor 30 and the loading motor 20 are coaxially fixedly connected; the controller 10 provides a driving voltage U and a driving current I to the tested fuel motor 30 to control the rotation of the tested fuel motor 30; the resistance simulation circuit 70 is connected to the winding of the loading motor 20 to form a path, and the controller 10 obtains the induced current i of the resistance simulation circuit 70 when the tested fuel motor 30 rotates; the speed detector 50 detects the speed of the loading motor 20 to obtain the speed n; the controller 10 generates a first numerical relationship table according to the speed n and the induced current i, and calculates the input power W according to the driving voltage U and the driving current I 入 .

[0031] In this step, the loading motor 20 and the tested fuel motor 30 are respectively placed in the first chamber and the second chamber filled with fuel of a preset temperature value to simulate the actual working environment of the fuel motor; the rotating shafts of the tested fuel motor 30 and the loading motor 20 are coaxially fixedly connected, and the resistance simulation circuit 70 is connected to the winding of the loading motor 20 to form a path. When the controller 10 provides a driving voltage U and a driving current I to the tested fuel motor 30 to control the rotation of the tested fuel motor 30, since the rotating shafts of the tested fuel motor 30 and the loading motor 20 are coaxially fixedly connected, the loading motor 20 will be driven to rotate, and then an induced electromotive force will be generated in the loading motor 20, so that the resistance simulation circuit generates an induced current i, and the coil of the loading motor 20 will have the effect of inhibiting the rotation of the tested fuel motor due to the action of the induced current i. Such a design can simulate the resistance of the impeller to the fuel motor in a real environment, so by simulating the real working environment of the fuel motor, the accuracy of the fuel motor working efficiency test is greatly improved.

[0032] The resistance simulation circuit 70 in the embodiment of the present invention includes a variable resistor R. When the controller 10 provides a driving voltage U and a driving current I of a certain value to the fuel motor 30 under test to control the rotation of the fuel motor 30 under test, the induced electromotive force generated by the loading motor 20 is also unchanged. Therefore, by adjusting the resistance value of the variable resistor R, the value range of the induced current i can be obtained, and then the value range of the speed n can be obtained, so as to generate a first numerical relationship table for the next step.

[0033] Step 2: Output power calculation:

[0034] The loading motor 20 and the load simulation component 40 are coaxially fixedly connected through the loading shaft 80, and the torque sensor 60 is installed on the loading shaft 80 to measure the torque value T of the loading shaft 80; the controller 10 provides a driving current I1 to the loading motor 20 so that the speed of the loading motor 20 is n1, and the induced current value corresponding to the speed n1 is determined to be i1 according to the first numerical relationship table; the controller 10 provides a driving current with a current value of i1 to the load simulation component 40 so that the load simulation component 40 applies a load to the loading motor 20, and the controller 10 obtains the torque value T1 measured by the torque sensor 60; according to the numerical range of the speed n in the first numerical relationship table, the value of the speed n1 is adjusted and the above steps are repeated, and the controller 10 generates a second numerical relationship table according to the speed n and the torque value T, and calculates the output power W according to the speed n and the torque value T 出 .

[0035] During the output power calculation process, the loading motor 20 is no longer installed in the first chamber filled with fuel of a preset temperature value, but is coaxially fixedly connected to the load simulation component 40 through the loading shaft 80 outside the fuel tank (i.e., the external non-fuel environment). When the embodiment of the present invention is implemented, the loading motor 20 can be removed from the fuel tank after step one is completed, and then connected to the load simulation component 40. The load simulation component 40 is a device that actively applies a load, such as a motor, and those skilled in the art can also choose other products as a substitute. The torque sensor 60 in the embodiment of the present invention is installed on the loading shaft 80, and does not need to be placed in the fuel to measure the torque, so there will be no problem of easy damage as in the background technology.

[0036] First, the controller 10 provides a driving current I1 to the loading motor 20 so that the speed of the loading motor 20 is constant at n1. According to the first numerical relationship table generated by the speed n and the induced current i during the input power calculation process, the induced current value i1 corresponding to the speed n1 is determined. Then, the controller 10 provides a driving current to the load simulation component 40 so that the load simulation component 40 actively applies a load to the loading motor 20 until the driving current value reaches i1. At this time, the torque value collected by the torque sensor 60 is T1, and the controller 10 obtains the torque value T1. According to the numerical range of the speed n in the first numerical relationship table, the value of the speed n1 is continuously adjusted and the above steps are repeated to obtain the torque value T1 corresponding to different speeds n1. The controller 10 generates a second numerical relationship table based on the speed n and the torque value T to calculate the output power.

[0037] It should be noted that the first numerical relationship table and the second numerical relationship table in the embodiment of the present invention can be either a table file or a waveform chart formed by connecting multiple endpoints in sequence, so that the number of sampling points can be increased. Therefore, in the process of input power calculation and output power calculation, there is no need to strictly limit the number of sampling points, but the convenience of testing is given priority, because data errors are inevitable. Of course, the most preferred method is to strictly correspond to the test in the output power calculation process according to the n value in the first numerical relationship table to ensure the accuracy of the fuel motor performance measurement.

[0038] Step 3: Work efficiency calculation:

[0039] According to the input power W 入 And output power W 出 Calculate the working efficiency of the fuel motor under test. The specific calculation method is: working efficiency = output power W 出 / Input Power W 入 .

[0040] Since there are multiple sets of speed n and torque values ​​T in the second numerical relationship table, the output power W calculated according to different speed n and torque values ​​T is 出 There will be some differences in the values. In the embodiment of the present invention, the output power W obtained by calculation can be 出 Generate a waveform to determine the output power W 出 The maximum speed n and torque value T.

[0041] In summary, the present invention uses the first numerical relationship table obtained in the input power calculation process to measure the output power in an external non-fuel environment, which not only introduces the influence of the real working environment of the fuel motor, but also ensures the accuracy of the test. It is the most suitable solution for fuel motor performance testing.

[0042] Specifically, in the embodiment of the present invention, the input power W 入 The calculation method is: Input power W 入 =1.732*U*I*cosφ; where cosφ is the power factor; output power W 出 The calculation method is: Output power W 出 = T*n / 9.55.

[0043] The power factor is known in the industry and can be directly queried and incorporated into the calculation. 入 And output power W 出 The calculation formulas are all known in the industry, and the origin of the specific values ​​will not be repeated in this invention.

[0044] More preferably, in the embodiment of the present invention, when calculating the input power, the controller 10 calculates the first resistance coefficient according to the first numerical relationship table, and then calculates the input power W by combining the first resistance coefficient and the driving voltage U and the driving current I. 入 , and when calculating the output power, the controller 10 calculates the second resistance coefficient according to the second numerical relationship table, and then calculates the output power W by combining the second resistance coefficient, the speed n, and the torque value T 出 .

[0045] Since there are losses in the process of mechanical transmission and energy conversion (conversion of mechanical energy into electrical energy), there must be differences between the theoretical value and the measured value. Therefore, the embodiment of the present invention combines the first numerical relationship table and the second numerical relationship table to calculate the corresponding resistance coefficient and correct the values ​​of input power and output power.

[0046] Specifically, the first resistance coefficient and the second resistance coefficient in the embodiment of the present invention are calculated as follows:

[0047] First, according to the values ​​of the speed n and the induced current i in the first numerical relationship table, the corresponding relationship between the speed n and the induced voltage u is determined, the induced voltage u is equal to the product of the induced current i and the resistance R in the resistance simulation circuit 70, and then the slope of the waveform formed by the corresponding values ​​of the speed n and the induced voltage u is calculated, and the slope value is used as the first resistance coefficient. Then, the slope of the waveform formed by the corresponding values ​​of the speed n and the torque value T in the second numerical relationship table is calculated, and the slope value is used as the second resistance coefficient; for the calculation of the slope, the calculation can be combined with the value of the previous sampling point or the next sampling point.

[0048] Secondly, the power value is calculated by the following formula: Input power W 入 The calculation method is: Input power W 入 =K1*1.732*U*I*cosφ; output power W 出 The calculation method is: Output power W 出 =K2* T*n / 9.55; wherein, K1 is the first resistance coefficient, and K2 is the second resistance coefficient.

[0049] Finally, calculate the working efficiency, that is, working efficiency = output power W 出 / Input Power W 入 = (K2* T*n / 9.55) / (K1*1.732*U*I*cosφ).

[0050] The embodiment of the present invention also includes a fuel motor working efficiency measuring device, such as Figures 1 to 3As shown, the fuel motor working efficiency measuring device includes: a fuel tank assembly 90 provided with a hollow chamber, the hollow chamber is divided into a first chamber and a second chamber, and both are filled with fuel of a preset temperature value; the fuel motor working efficiency measuring device also includes a controller 10, and a loading motor 20 electrically connected to the controller 10, a fuel motor 30 to be measured, a load simulation component 40, a speed detector 50, a torque sensor 60, and a resistance simulation circuit 70, the speed detector 50 is used to detect the speed of the loading motor 20 and send it to the controller 10; the fuel motor working efficiency measuring device is used to implement the fuel motor working efficiency measuring method of the aforementioned embodiment, and the specific process can be found in the above text.

[0051] Preferably, the hollow chamber in the embodiment of the present invention is filled with fuel, completely covering the loading motor 20 and the tested fuel motor 30. The embodiment of the present invention does not limit the preset temperature value of the fuel, and can refer to the working environment temperature of the tested fuel motor 30. The specific value can also refer to the examples in the subsequent embodiments. The speed detector 50 in this embodiment can use a rotary transformer to realize its function. This embodiment does not limit the specific installation relationship between the speed detector 50 and the loading motor 20, as long as the purpose of the present invention to measure the speed of the loading motor 20 is achieved.

[0052] Specifically, the fuel tank assembly 90 in the embodiment of the present invention includes a fuel tank 901 with a hollow chamber, a low-temperature environment box forming a first preset temperature environment, a temperature detector for detecting the temperature of the fuel, and a fuel tank temperature controller electrically connected to the low-temperature environment box and the temperature detector; the fuel tank 901 is placed in the low-temperature environment box, the temperature detector is used to measure the temperature of the fuel, and the fuel tank temperature controller is used to control the low-temperature environment box according to the temperature detection value of the temperature detector, so that the fuel in the fuel tank reaches the preset temperature value. The fuel tank temperature controller in this embodiment is electrically connected to the controller 10 of the aforementioned embodiment, and the controller 10 realizes unified control during the test process, or the embodiment of the present invention can also omit the fuel tank temperature controller, and directly realize the function of the fuel tank temperature controller of this embodiment through the controller 10 of the aforementioned embodiment. In this embodiment, the closed-loop control of the fuel temperature is realized by the temperature detector.

[0053] Preferably, the fuel tank assembly 90 in the embodiment of the present invention further includes a heater 902 electrically connected to the fuel tank temperature controller, and the heater 902 is arranged on the inner wall of the fuel tank 901 to heat the fuel. The heater 902 in this embodiment can be a plurality of heating belts, which are arranged circumferentially on the inner wall of the fuel tank 901, and the heating belts can be resistance wire heating belts.

[0054] In the embodiment of the present invention, a low-temperature environment box that can reach a low-temperature environment of -50°C can be selected. First, the fuel tank 901 is placed in the low-temperature environment box. Then, the fuel tank temperature controller controls the temperature of the low-temperature environment box to gradually drop to -55°C. When the temperature of the low-temperature environment box is lower than -47°C, the fuel tank temperature controller controls the heater to heat, so that the fuel temperature in the fuel tank 901 is maintained above -47°C (the fuel will solidify at -47°C), and a temperature detector is combined to realize closed-loop control of the fuel temperature.

[0055] Preferably, the rotating shaft of the tested fuel motor 30 in the embodiment of the present invention is coaxially installed in the hollow rotating shaft of the loading motor 20 through an adapter sleeve, and the adapter sleeve can move along the axis of the hollow rotating shaft. When the tested fuel motor 30 is in a low temperature environment, the rotating shaft of the tested fuel motor 30 shrinks axially, thereby driving the adapter sleeve to move along the axis of the hollow rotating shaft, eliminating the influence of the rotating shaft of the tested fuel motor 30 on the steering force of the hollow rotating shaft of the loading motor 20.

[0056] Specifically, the fuel tank assembly 90 in the embodiment of the present invention also includes a motor mounting frame 903 fixed in the fuel tank 901, and the motor mounting frame 903 includes a frame beam 9031 fixed to the bottom of the fuel tank 901, a base plate 9032 horizontally installed on the frame beam 9031, and a vertical plate 9033 vertically fixed in the middle of the base plate 9032; when the input power is calculated, the loading motor 20 and the tested fuel motor 30 are respectively located on both sides of the vertical plate 9033, and the vertical plate 9033 divides the hollow chamber of the fuel tank 901 into a first chamber and a second chamber.

[0057] In this embodiment, a plurality of screw holes are provided on the frame beam 9031, and a plurality of elliptical holes are also provided on the bottom plate 9032. The screws pass through the elliptical holes and the screw holes to fix the vertical plate 9033 and the bottom plate 9032 in the oil tank 901. The combination of the screws, the screw holes and the elliptical holes facilitates the removal of the bottom plate 9032 from the oil tank 901. At the same time, the bottom plate 9032 can be moved along the length and width directions of the oil tank 901 to adjust the position of the vertical plate 9033.

[0058] The embodiment of the present invention does not limit the size of the vertical plate 9033 , and it only needs to achieve the function of separation, that is, to eliminate the influence of the fuel flow on one side of the tested fuel motor 30 on the loading motor 20 .

[0059] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in the field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A method for measuring the working efficiency of a fuel motor, characterized in that: The method is implemented based on a fuel motor working efficiency measuring device, which comprises: a fuel tank assembly provided with a hollow chamber, wherein the hollow chamber is divided into a first chamber and a second chamber, both of which are filled with fuel of a preset temperature value; the fuel motor working efficiency measuring device also comprises a controller, and a loading motor electrically connected to the controller, a fuel motor to be tested, a load simulation component, a speed detector, a torque sensor, and a resistance simulation circuit, wherein the speed detector is used to detect the speed of the loading motor and send it to the controller; the method comprises: Input power calculation: the loading motor and the tested fuel motor are placed in the first chamber and the second chamber respectively, and the rotating shafts of the tested fuel motor and the loading motor are coaxially fixedly connected; the controller provides a driving voltage U and a driving current I to the tested fuel motor to control the rotation of the tested fuel motor; the resistance simulation circuit is connected to the winding of the loading motor to form a path, and the controller obtains the induced current i of the resistance simulation circuit when the tested fuel motor rotates; the speed detector detects the speed of the loading motor to obtain the speed n; the controller generates a first numerical relationship table according to the speed n and the induced current i, and calculates the input power W according to the driving voltage U and the driving current I 入 ; Output power calculation: the loading motor and the load simulation component are coaxially fixedly connected through a loading shaft, and the torque sensor is installed on the loading shaft to measure the torque value T of the loading shaft; the controller provides a driving current I1 to the loading motor so that the speed of the loading motor is n1, and the induced current value corresponding to the speed n1 is determined to be i1 according to the first numerical relationship table; the controller provides a driving current with a current value of i1 to the load simulation component so that the load simulation component applies a load to the loading motor, and the controller obtains the torque value T1 measured by the torque sensor; according to the numerical range of the speed n in the first numerical relationship table, the value of the speed n1 is adjusted and the above steps are repeated, and the controller generates a second numerical relationship table according to the speed n and the torque value T, and calculates the output power W according to the speed n and the torque value T. 出 ; Working efficiency calculation: According to the input power W 入 and the output power W 出 The working efficiency of the tested fuel-powered motor is calculated.

2. A method for measuring the working efficiency of a fuel motor according to claim 1, characterized in that: The input power W 入 The calculation method is: Input power W 入 =1.732*U*I*cosφ; where cosφ is the power factor; the output power W 出 The calculation method is: Output power W 出 = T*n / 9.

55.

3. A method for measuring the working efficiency of a fuel motor according to claim 1, characterized in that: When calculating the input power, the controller calculates the first resistance coefficient according to the first numerical relationship table, and then calculates the input power W by combining the first resistance coefficient with the driving voltage U and the driving current I. 入 .

4. A method for measuring the working efficiency of a fuel motor as claimed in claim 3, characterized in that: When calculating the output power, the controller calculates the second resistance coefficient according to the second numerical relationship table, and then calculates the output power W by combining the second resistance coefficient, the speed n, and the torque value T. 出 .

5. A method for measuring the working efficiency of a fuel motor as claimed in claim 4, characterized in that: The input power W 入 The calculation method is: Input power W 入 =K1*1.732*U*I*cosφ; the output power W 出 The calculation method is: Output power W 出 =K2* T*n / 9.55; wherein cosφ is the power factor, K1 is the first resistance coefficient, and K2 is the second resistance coefficient.

6. A fuel motor working efficiency measuring device, characterized in that: The fuel motor working efficiency measuring device comprises: a fuel tank assembly provided with a hollow chamber, wherein the hollow chamber is divided into a first chamber and a second chamber, and both chambers are filled with fuel of a preset temperature value; the fuel motor working efficiency measuring device also comprises a controller, and a loading motor electrically connected to the controller, a fuel motor to be measured, a load simulation component, a speed detector, a torque sensor, and a resistance simulation circuit, wherein the speed detector is used to detect the speed of the loading motor and send it to the controller; The fuel motor working efficiency measuring device is used to implement the fuel motor working efficiency measuring method as described in any one of claims 1 to 5.

7. A fuel motor working efficiency measuring device as claimed in claim 6, characterized in that: The fuel tank assembly includes a fuel tank having the hollow chamber, a low-temperature environment box forming a first preset temperature environment, a temperature detector for detecting the temperature of the fuel, and a fuel tank temperature controller electrically connected to the low-temperature environment box and the temperature detector; the fuel tank is placed in the low-temperature environment box, the temperature detector is used to measure the temperature of the fuel, and the fuel tank temperature controller is used to control the low-temperature environment box according to the temperature detection value of the temperature detector, so that the fuel in the fuel tank reaches a preset temperature value.

8. A fuel motor working efficiency measuring device as claimed in claim 7, characterized in that: The fuel tank assembly also includes a heater electrically connected to the fuel tank temperature controller. The heater is arranged on the inner wall of the fuel tank and is used to heat the fuel.

9. A fuel motor working efficiency measuring device as claimed in claim 6, characterized in that: The rotating shaft of the tested fuel motor is coaxially installed in the hollow rotating shaft of the loading motor through an adapter sleeve, and the adapter sleeve can move along the axis of the hollow rotating shaft.

10. A fuel motor working efficiency measuring device as claimed in claim 6, characterized in that: The fuel tank assembly also includes a motor mounting frame fixed in the fuel tank, and the motor mounting frame includes a frame beam fixed to the bottom of the fuel tank, a base plate horizontally installed on the frame beam, and a vertical plate vertically fixed in the middle of the base plate; when the input power is calculated, the loading motor and the tested fuel motor are respectively located on both sides of the vertical plate, and the vertical plate divides the hollow chamber of the fuel tank into the first chamber and the second chamber.

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