A gearbox testing system

Abstract

The utility model provides a gearbox test system, including effective rate unit, hydraulic gear shifting unit, hydraulic differential steering unit, heat dissipation unit, data acquisition unit, mechanical gear shifting unit and host computer, and efficiency unit is used for testing gearbox efficiency performance and state, and hydraulic gear shifting unit is used for testing the gear shifting control and pressure state monitoring of gearbox, judges gear shifting state whether normal, and hydraulic differential steering unit is used for detecting whether the working state of gearbox hydraulic differential clutch is normal, and heat dissipation unit is used for judging whether the oil temperature in gearbox is normal, and data acquisition unit is used for collecting and unit's test data acquisition and transmission to host computer, and host computer is used for controlling and judging whether each test part of gearbox is normal according to the test data transmission of data acquisition unit. The utility model need not many special development many test devices, can also carry out systematic test inspection to gearbox comprehensively, and test efficiency is high and convenient.

Description

Technical Field

[0001] This utility model relates to the field of gearbox testing technology, specifically to a gearbox testing system. Background Technology

[0002] As the core component for power transmission in a machine, the transmission's reliability, lifespan, and efficiency have a decisive impact on the overall performance, reliability, and efficiency of the machine. Furthermore, the transmission is a priority assembly component during the overall assembly process, and its location within the machine's space is limited. Repairing it requires disassembling numerous other parts, resulting in significant rework time and costs.

[0003] If problems are discovered outside the factory, the equipment typically needs to be transported in-house for disassembly and repair, further increasing repair time and costs, and severely impacting brand image. Therefore, better early detection and handling of transmission problems, preventing defective products from progressing to the next stage, and improving transmission reliability significantly impacts production efficiency, transmission and overall machine maintenance costs, overall machine reliability, and brand image.

[0004] Tractor gearboxes, especially power shift hydraulic differential gearboxes, have complex structures, including not only mechanical transmission parts but also hydraulic transmission and electrical control parts. Therefore, tractor gearbox testing platforms need to verify the reliability of their mechanical transmission parts and monitor their internal hydraulic and control status to ensure their functional and quality reliability.

[0005] For testing the transmission efficiency and reliability of gearboxes, the current common approach is to apply load to the output end and confirm the results by testing the power at both the input and output ends. For functional testing of gearboxes, the common approach is to design dedicated testing devices for different functions. This makes the entire gearbox testing process complex, requiring multiple testing devices to complete the overall test, resulting in low testing efficiency, inconvenience, and high development costs for the testing devices. Utility Model Content

[0006] This invention provides a gearbox testing system that can comprehensively and systematically test and inspect gearboxes without the need to develop multiple testing devices. It is efficient, convenient, and low in cost.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A gearbox testing system includes an efficiency unit, a hydraulic shifting unit, a hydraulic differential steering unit, a heat dissipation unit, a data acquisition unit, a mechanical shifting unit, and a host computer.

[0009] The efficiency unit is connected to the input and output shafts of the gearbox and is used to provide power to the gearbox and detect the speed and torque of the input and output shafts of the gearbox, thereby confirming the input power and output power.

[0010] The hydraulic shifting unit is controlled by the host computer through an electronic control signal to control the shift valve of the gearbox. When it is necessary to test the operation of different gears, the hydraulic shifting unit is used to detect whether the hydraulic pressure at the shift valve body of the gearbox meets the set value.

[0011] The hydraulic differential steering unit controls the working current of the proportional valve of the gearbox via PWM according to the manual or automatic steering mode selected by the host computer. It is used to detect the actual working current of the proportional valve, the hydraulic pressure, and the output shaft speed. Based on whether the data relationship of the three is matched, it determines whether the differential steering function, i.e. the working state of the clutch, is normal.

[0012] The heat dissipation unit is controlled by a host computer to dissipate heat for the efficiency unit and the hydraulic oil inside the gearbox.

[0013] The mechanical shifting unit controls the operation of the main clutch electric push rod and the mechanical shifting electric push rod of the gearbox in sequence according to the electronic control signal received from the host computer. It is used to test the operating force of the gearbox clutch and the mechanical shifting part, thereby determining whether the gearbox main clutch and the mechanical shifting part are smooth or have any jamming, and confirming the status of the mechanical shifting part.

[0014] The data acquisition unit collects and transmits the test data of the efficiency unit, hydraulic shifting unit, hydraulic differential steering unit, heat dissipation unit, and mechanical shifting unit to the host computer.

[0015] The host computer is used to control and determine whether the various test parts of the gearbox are normal based on the test data transmitted by the data acquisition unit.

[0016] Preferably, the efficiency unit includes a power input module, an input shaft torque and speed sensor, a loading module, and an output shaft torque and speed sensor.

[0017] The power input module is connected to the gearbox input shaft via an input shaft torque and speed sensor to detect the speed and torque data of the gearbox input shaft. The loading module is connected to the gearbox output shaft via an output shaft torque and speed sensor to detect the speed and torque data of the gearbox output shaft.

[0018] Preferably, the hydraulic shifting unit includes a pressure sensor connected to the shift valve of the gearbox, used to detect whether the hydraulic pressure at the shift valve body of the gearbox meets the set value when operating in different gears.

[0019] Preferably, the hydraulic differential steering unit includes a steering wheel angle sensor, a current detection module, and a clutch pressure sensor.

[0020] The steering wheel angle sensor is used to provide steering wheel rotation angle data to the host computer in manual steering mode. The host computer controls the current through the proportional valve according to the steering wheel rotation angle, thereby controlling the hydraulic pressure at the clutch and thus controlling the speed and steering of the gearbox output shaft.

[0021] The current detection module is used to detect the actual current passing through the proportional valve in manual or automatic steering mode. The clutch pressure sensor is connected to the clutch of the gearbox and is used to detect the working pressure at the clutch in manual or automatic steering mode.

[0022] Preferably, the heat dissipation unit includes a radiator, a heat dissipation speed sensor, and a temperature sensor. The radiator is used to provide heat dissipation for the loading module and for the hydraulic oil inside the gearbox.

[0023] The heat dissipation speed sensor is used to provide the speed data of the fan inside the radiator. The host computer controls the operating speed of the radiator by analyzing the speed data. The temperature sensor is used to detect the temperature of the hydraulic oil inside the gearbox and transmit the temperature data to the data acquisition unit.

[0024] Preferably, the mechanical shift unit includes a clutch electric push rod, a shift electric push rod, and a torque sensor. The clutch electric push rod is connected to the gearbox clutch operating lever and is used to control the gearbox clutch operating lever.

[0025] The shift lever is connected to the gearbox shift lever and is used to control the gearbox shift lever. The torque sensors are respectively installed on the gearbox clutch lever and the gearbox shift lever and are used to detect the torque during the shift operation and transmit the detected data to the data acquisition unit.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. It can comprehensively and systematically test and inspect the transmission without the need to develop multiple testing devices, making the testing efficient, convenient, and cost-effective.

[0028] 2. The efficiency unit can be used to test the working efficiency of the transmission and to monitor and judge the status of the transmission;

[0029] 3. The gearbox shifting control and pressure status monitoring are realized through hydraulic shifting unit and mechanical shifting unit to determine whether the shifting status is normal;

[0030] 4. By using the hydraulic differential steering unit, the control of the hydraulic differential clutch during its overall operation is simulated, and the actual current and pressure of the proportional valve are monitored to check whether the hydraulic differential clutch is operating normally.

[0031] 5. The cooling unit controls the transmission oil temperature and cooling capacity, monitors the heat dissipation requirements when the oil temperature reaches a certain level, provides parameters for matching the radiator to the whole machine, and monitors the transmission oil temperature under certain cooling conditions to determine whether the oil temperature is normal, thereby analyzing whether the internal components are working properly. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the test system structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the testing method of this utility model. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0035] It should be noted that when a component / part is referred to as being "set on" another component / part, it can be directly set on the other component / part or there may be an intervening component / part. When a component / part is referred to as being "connected / linked" to another component / part, it can be directly connected / linked to the other component / part or there may be an intervening component / part. The term "connected / linked" as used herein can include electrical and / or mechanical physical connections / links. The term "including / comprises" as used herein means the presence of a feature, step, or component / part, but does not exclude the presence or addition of one or more other features, steps, or components / parts. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0037] Please see Figure 1 As shown, a gearbox testing system includes an efficiency unit, a hydraulic shifting unit, a hydraulic differential steering unit, a cooling unit, a data acquisition unit, a mechanical shifting unit, and a host computer. This system can be installed and used on a testing fixture as needed.

[0038] The efficiency unit, connected to the input and output shafts of the gearbox, provides power to the gearbox and detects the speed and torque of the input and output shafts to determine the input and output power. This unit includes a power input module (motor) connected to the gearbox input shaft via an input shaft torque and speed sensor, and a loading module (magnetic powder brake) connected to the gearbox output shaft via an output shaft torque sensor. The input and output shaft torque sensors detect the speed and torque of the input and output shafts to determine the input and output power, and thus the gearbox transmission efficiency (output power to input power ratio). The loading module preferably uses a magnetic powder brake, whose operating current can be controlled by a controller to control the loading force. The magnetic powder brake generates significant heat during operation, requiring internal water cooling. Therefore, internal cooling water is pumped through a radiator for heat dissipation.

[0039] During testing, the power input module drives the gearbox, and the loading module loads the gearbox output. The input shaft torque sensor and the output shaft torque sensor transmit the speed and torque data of the input and output shafts to the host computer via the data acquisition unit. The host computer determines the power of the input and output ends based on the test signal data, and then confirms the transmission efficiency of the gearbox (the ratio of output power to input power). At the same time, it compares the measured transmission efficiency with the set range to confirm the working status of the gearbox.

[0040] The hydraulic shift unit, controlled by a host computer via electronic signals, controls the gearbox's shift valves. When testing different gear positions, the hydraulic shift unit checks if the hydraulic pressure at the gearbox's shift valve body meets the set value. The gearbox itself contains shift valves used to control the gearbox's operating gears (different speed gears). The host computer sends signals to the corresponding gear valves to control the corresponding gear's operation. When a specific gear is needed, an electronic signal is sent to the corresponding shift valve to activate that gear. The hydraulic shift unit is equipped with a pressure sensor connected to the gearbox shift valves to detect the hydraulic pressure at the valve body during different gear operations. Simultaneously, an output shaft speed and torque sensor at the gearbox output shaft detects the output shaft speed.

[0041] When performing a gear shifting function test, the host computer selects the working gear and sends a control signal to the corresponding gear valve body to control the corresponding valve body to work. At this time, the hydraulic pressure and output shaft speed are monitored, and the gearbox status is judged to be qualified by determining whether the set values ​​are met.

[0042] The hydraulic differential steering unit, depending on whether the transmission is in manual or automatic steering mode selected by the host computer, controls the operating current of the transmission's proportional valve via PWM. It detects the actual operating current of the proportional valve, the hydraulic pressure, and the output shaft speed, and determines whether the differential steering function, i.e., the clutch's operating status, is normal based on the matching of these three data points. The transmission body contains a differential clutch, and an external hydraulic proportional valve is mounted on the outside. Different current signals passing through the proportional valve affect its opening, thereby adjusting the hydraulic pressure at the differential clutch and ultimately controlling the clutch's operating status. Different hydraulic pressures in the differential clutch result in different output shaft speeds and steering directions (i.e., forward and reverse rotation).

[0043] The testing fixture can be equipped with a steering wheel, beneath which is a pivot and linkage mechanism. The hydraulic differential steering unit includes a steering wheel angle sensor. When the steering wheel is turned, the linkage mechanism drives the steering wheel angle sensor, thus confirming the steering wheel rotation angle. Based on the steering wheel rotation angle, the host computer controls the current through the proportional valve via PWM, thereby controlling the hydraulic pressure at the clutch, and consequently controlling the output shaft speed and steering. The hydraulic differential steering unit also includes a current detection module to detect the actual current through the proportional valve; it also includes a clutch pressure sensor (connected to the clutch) to detect the working pressure at the clutch. By determining the actual current through the proportional valve, the output shaft speed, and the hydraulic pressure at the clutch, the system determines whether the clutch is functioning correctly.

[0044] During the steering test, the first step is to select either manual or automatic steering mode. In manual mode, turning the steering wheel transmits the steering wheel angle to the data acquisition unit via the steering wheel angle sensor, which then transmits the data to the host computer. The host computer uses the angle signal from the steering wheel angle sensor to determine the magnitude of the proportional valve's operating current and controls the proportional valve's operating current via PWM. Then, the current detection module, clutch pressure sensor, and output shaft torque and speed sensor detect the actual operating current of the proportional valve, the hydraulic pressure, and the output shaft speed. Based on whether the data relationship between these three parameters matches, the host computer determines whether the differential steering function, i.e., the clutch's working status, is normal. In automatic mode, there is no need to turn the steering wheel. The host computer directly controls the proportional valve current to linearly increase from 0 to the maximum operating current via PWM. The current detection module, clutch pressure sensor, and output shaft torque and speed sensor detect the actual operating current of the proportional valve, the hydraulic pressure, and the output shaft speed. Based on whether the data relationship between these three parameters matches, the host computer determines whether the differential steering function, i.e., the clutch's working status, is normal.

[0045] Automatic mode is relatively convenient, requiring no manual control of the steering wheel; manual mode allows for better testing and troubleshooting of specific points.

[0046] The cooling unit, controlled by a host computer, provides cooling for the efficiency unit and the hydraulic oil inside the transmission. It includes a radiator and a speed sensor to detect the radiator's rotation speed, which is also controlled by the host computer. The radiator has two flow paths: one for cooling the loading module, where liquid from the loading module's cooling path flows into the radiator, is cooled, and then flows back into the loading module; the other for cooling the transmission hydraulic oil, which flows through the radiator under the action of a hydraulic pump, is cooled, and then flows back into the transmission. The cooling unit also includes a temperature sensor to detect the temperature of the transmission hydraulic oil.

[0047] There are two working modes for heat dissipation testing: one is used for initial data analysis of new products, specifically for testing heat dissipation requirements to confirm the heat dissipation capacity needed for the transmission system to operate normally. In this mode, the radiator speed and transmission oil temperature are monitored. When the oil temperature is higher than the set range, the radiator speed is increased; when the oil temperature is lower than the set range, the radiator speed is decreased. When the oil temperature remains within the set range, the radiator speed is confirmed. Based on the radiator fan speed, radiator size, and heat dissipation characteristics, the required heat dissipation capacity of the transmission is determined. The other mode is a transmission internal heat generation judgment mode, used to confirm whether there is abnormal heating inside the transmission, thereby determining whether the transmission is in normal condition. In this mode, the radiator speed remains constant. By monitoring the oil temperature and comparing it with the set value, it is determined whether the oil temperature is within the set range, thus judging whether the transmission is in good condition.

[0048] The mechanical shift unit, based on the received electronic control signals from the host computer, sequentially controls the operation of the transmission's main clutch electric push rod and mechanical shift electric push rod. This is used to test the operating force of the transmission's clutch and mechanical shift mechanism, thereby determining whether the operation is smooth or jammed, and confirming the status of the mechanical shift mechanism. The mechanical shift unit includes a clutch electric push rod and a shift electric push rod. The clutch electric push rod is connected to the transmission's main clutch operating lever via a linkage mechanism, with a torque sensor in between. The shift electric push rod is also connected to the transmission's mechanical shift operating lever via a linkage mechanism, with a torque sensor in between. The torque sensor detects the torque during operation, thereby determining whether the operation is smooth.

[0049] During testing, the host computer control signals sequentially control the clutch electric push rod and the shift electric push rod to work. The torque sensor records the torque at this time and transmits it to the host computer through the data acquisition unit. The host computer judges whether the operating torque meets the set value range, thereby determining whether the status of the main clutch and mechanical shifting part of the gearbox is normal.

[0050] The data acquisition unit collects test data from the efficiency unit, hydraulic shifting unit, hydraulic differential steering unit, heat dissipation unit, and mechanical shifting unit and transmits it to the host computer. The host computer is used to control and judge whether the various test parts of the gearbox are normal based on the test data transmitted by the data acquisition unit.

[0051] Please see Figure 2 As shown, a test method for a transmission test system is also disclosed. Based on the transmission test system, the test method includes the following steps (the test steps may be in any order):

[0052] A. Efficiency Test: The power input module drives the gearbox to work, and the loading module loads the gearbox output. The input shaft torque and speed sensor and the output shaft torque and speed sensor transmit the speed and torque data of the input shaft and output shaft to the host computer through the data acquisition unit. The host computer determines the power of the input and output ends based on the test signal data, thereby confirming the transmission efficiency of the gearbox. At the same time, the measured transmission efficiency is compared with the set range to confirm the working status of the gearbox.

[0053] B. Hydraulic shift test: When performing the shift function test, the host computer selects the working gear, sends a control signal to the corresponding shift valve body, controls the corresponding shift valve body to work, monitors the hydraulic pressure through the pressure sensor and monitors the output shaft speed in step A at the same time, and judges whether the gearbox status is qualified by determining whether the set value is met.

[0054] C. Mechanical shift test: During the test, the host computer control signal sequentially controls the clutch electric push rod and the shift electric push rod to work. The torque sensor records the torque at this time and transmits it to the host computer through the data acquisition unit. The host computer judges whether the operating torque meets the set value range, thereby determining whether the status of the main clutch and mechanical shift part of the gearbox is normal.

[0055] D. Steering test: Select the steering mode, the host computer confirms the working current of the proportional valve of the gearbox, and controls the adjustment of the working current of the proportional valve through PWM. Then, the current detection module detects the actual working current of the proportional valve, the clutch pressure sensor detects the hydraulic pressure of the clutch, and the output shaft torque and speed sensor detects the output shaft speed. Based on whether the data of the three are matched, it is determined whether the differential steering function, i.e. the working state of the clutch, is normal.

[0056] E. Heat dissipation test: Select the working mode, the host computer controls the operating speed of the radiator, and monitors the temperature of the hydraulic oil inside the transmission through the temperature sensor. By comparing the temperature with the set value, it is determined whether the oil temperature is within the set range, thereby determining whether the transmission is in good condition.

[0057] In step D, there are two steering modes: manual steering mode and automatic steering mode. If manual steering mode is selected, the steering angle data is transmitted to the host computer via the data acquisition unit through the steering wheel angle sensor. The host computer then determines the working current of the gearbox proportional valve based on the angle data and controls the working current of the proportional valve through PWM. The current detection module detects the actual working current of the proportional valve, the clutch pressure sensor detects the hydraulic pressure of the clutch, and the output shaft torque and speed sensor detects the output shaft speed. Based on whether the data of the three are matched, it is determined whether the differential steering function, i.e. the clutch working status, is normal.

[0058] If the automatic steering mode is selected, the host computer directly controls the proportional valve current to increase linearly from 0 to the maximum working current through PWM. Then, the current detection module detects the actual working current of the proportional valve, the clutch pressure sensor detects the hydraulic pressure of the clutch, and the output shaft torque and speed sensor detects the output shaft speed. Based on whether the data of the three are matched, it is determined whether the differential steering function, i.e. the working state of the clutch, is normal.

[0059] There are two operating modes in step E: First, the radiator speed and transmission hydraulic oil temperature are monitored. When the oil temperature is higher than the set range, the radiator speed is increased; when the oil temperature is lower than the set range, the radiator speed is decreased. When the oil temperature remains within the set range, the radiator speed sensor is used to confirm the radiator speed. Based on the radiator speed, the required cooling capacity of the transmission is determined according to the radiator size and cooling characteristics. Second, the radiator speed is kept constant. The transmission hydraulic oil temperature is monitored and compared with the set value to determine whether the oil temperature is within the set range, thereby determining whether the transmission condition is qualified.

[0060] This invention eliminates the need for developing numerous specialized testing devices, enabling comprehensive and systematic testing and inspection of the transmission. It boasts high testing efficiency, convenience, and low cost. The efficiency unit tests the transmission's operating efficiency and monitors and assesses its status. Hydraulic and mechanical shift units control and monitor pressure conditions to determine if shifting is normal. The hydraulic differential steering unit simulates the operation of the hydraulic differential clutch and monitors the actual current and pressure of the proportional valve to verify its proper functioning. The cooling unit controls the transmission oil temperature and cooling capacity, monitoring the required heat dissipation to reach a certain oil temperature, providing parameters for radiator matching. Under specific cooling conditions, the transmission oil temperature is monitored to determine its normality, thereby analyzing the operational status of internal components.

[0061] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A gearbox testing system, characterized in that, It includes an efficiency unit, a hydraulic shifting unit, a hydraulic differential steering unit, a heat dissipation unit, a data acquisition unit, a mechanical shifting unit, and a host computer; The efficiency unit is connected to the input and output shafts of the gearbox and is used to provide power to the gearbox and detect the speed and torque of the input and output shafts of the gearbox, thereby confirming the input power and output power. The hydraulic shifting unit is controlled by the host computer through an electronic control signal to control the shift valve of the gearbox. When it is necessary to test the operation of different gears, the hydraulic shifting unit is used to detect whether the hydraulic pressure at the shift valve body of the gearbox meets the set value. The hydraulic differential steering unit controls the working current of the proportional valve of the gearbox via PWM according to the manual or automatic steering mode selected by the host computer. It is used to detect the actual working current of the proportional valve, the hydraulic pressure, and the output shaft speed. Based on whether the data relationship of the three is matched, it determines whether the differential steering function, i.e. the working state of the clutch, is normal. The heat dissipation unit is controlled by a host computer to dissipate heat for the efficiency unit and the hydraulic oil inside the gearbox. The mechanical shifting unit controls the operation of the main clutch electric push rod and the mechanical shifting electric push rod of the gearbox in sequence according to the electronic control signal received from the host computer. It is used to test the operating force of the gearbox clutch and the mechanical shifting part, thereby determining whether the gearbox main clutch and the mechanical shifting part are smooth or have any jamming, and confirming the status of the mechanical shifting part. The data acquisition unit collects and transmits the test data of the efficiency unit, hydraulic shifting unit, hydraulic differential steering unit, heat dissipation unit, and mechanical shifting unit to the host computer. The host computer is used to control and determine whether the various test parts of the gearbox are normal based on the test data transmitted by the data acquisition unit.

2. The gearbox testing system according to claim 1, characterized in that, The efficiency unit includes a power input module, an input shaft torque and speed sensor, a loading module, and an output shaft torque and speed sensor. The power input module is connected to the gearbox input shaft via an input shaft torque and speed sensor to detect the speed and torque data of the gearbox input shaft. The loading module is connected to the gearbox output shaft via an output shaft torque and speed sensor to detect the speed and torque data of the gearbox output shaft.

3. The gearbox testing system according to claim 1, characterized in that, The hydraulic shifting unit includes a pressure sensor, which is connected to the shift valve of the gearbox and is used to detect whether the hydraulic pressure at the shift valve body of the gearbox meets the set value when different gears are in operation.

4. The gearbox testing system according to claim 1, characterized in that, The hydraulic differential steering unit includes a steering wheel angle sensor, a current detection module, and a clutch pressure sensor. The steering wheel angle sensor is used to provide steering wheel rotation angle data to the host computer in manual steering mode. The host computer controls the current through the proportional valve according to the steering wheel rotation angle, thereby controlling the hydraulic pressure at the clutch and thus controlling the speed and steering of the gearbox output shaft. The current detection module is used to detect the actual current passing through the proportional valve in manual or automatic steering mode. The clutch pressure sensor is connected to the clutch of the gearbox and is used to detect the working pressure at the clutch in manual or automatic steering mode.

5. The gearbox testing system according to claim 2, characterized in that, The heat dissipation unit includes a radiator, a heat dissipation speed sensor, and a temperature sensor. The radiator is used to provide heat dissipation for the loading module and for the hydraulic oil inside the gearbox. The heat dissipation speed sensor is used to provide the speed data of the fan inside the radiator. The host computer controls the operating speed of the radiator by analyzing the speed data. The temperature sensor is used to detect the temperature of the hydraulic oil inside the gearbox and transmit the temperature data to the data acquisition unit.

6. The gearbox testing system according to claim 1, characterized in that, The mechanical shifting unit includes a clutch electric push rod, a shift electric push rod, and a torque sensor. The clutch electric push rod is connected to the gearbox clutch operating lever and is used to control the gearbox clutch operating lever. The shift lever is connected to the gearbox shift lever and is used to control the gearbox shift lever. The torque sensors are respectively installed on the gearbox clutch lever and the gearbox shift lever and are used to detect the torque during the shift operation and transmit the detected data to the data acquisition unit.

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