Static test device for parking function of electric drive reduction gearbox

Abstract

The utility model discloses a kind of static test device of parking function of electric drive reduction gearbox, including the constant-temperature oil supply system for being used to supply oil to prototype, temperature sensor and flow sensor being set on oil supply pipeline, for driving the parking mechanism action of prototype, parking motor, host computer is electrically connected with parking motor and constant-temperature oil supply system, prototype is equipped with oil inlet and oil return port;Constant-temperature oil supply system is communicated with prototype by oil inlet and oil return port respectively, and is provided with the adjusting component for adjusting lubricating oil temperature and flow;The testing device of the utility model, by fixing prototype to mother board, and using parking motor to drive parking mechanism to complete parking and cancel action in ratchet stationary state, the static working condition of simulation parking mechanism can be realized;Meanwhile with the help of constant-temperature oil supply system, the accurate adjustment of lubricating oil temperature and flow can be realized, improve the accuracy of test result.

Description

Technical Field

[0001] This utility model belongs to the field of testing equipment technology. Specifically, this utility model relates to a static testing device for the parking function of an electric drive gearbox. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the electric drive system, as a core component of the vehicle, has received increasing attention for its safety and reliability verification. Electric vehicles generally adopt integrated electric drive assemblies, in which a parking lock mechanism (P-gear mechanism) is installed within the reduction gearbox. When the vehicle is stationary, especially when parked on a slope, the parking pawl and ratchet engage to mechanically lock the vehicle and prevent it from rolling. Therefore, the performance verification of the parking mechanism is a crucial step in the testing process of electric drive systems.

[0003] Existing verification methods for parking mechanisms primarily rely on dynamic rotational load tests. These tests apply torque to simulate the vehicle's load under different operating conditions, thereby verifying the parking mechanism's load-bearing capacity during engagement, disengagement, and holding. However, in actual vehicle use, parking locking mechanisms involve numerous repeated parking and disengagement actions with the ratchet stationary, such as temporary parking on inclines or declines, or frequent starts and stops in congested traffic. These high-frequency engagement and disengagement actions in static states cause fatigue wear on components such as the pawl, ratchet, and springs, significantly impacting the overall durability of the parking mechanism.

[0004] The temperature and flow rate of the lubricating oil inside the electric drive gearbox are crucial factors affecting the working condition and testing accuracy of the parking mechanism. Different oil temperatures and flow rates directly alter the friction characteristics and lubrication effects between the parking mechanism components, thus impacting the stability of the parking lock and release actions. However, most existing static testing devices cannot achieve precise, real-time control of lubricating oil temperature and flow. Poor linkage between the host computer system and the oil control unit leads to significant deviations between the testing environment and the actual vehicle operating environment. This greatly diminishes the authenticity and reference value of the test data, making it difficult to accurately reflect the durability and reliability of the parking mechanism under actual operating conditions.

[0005] Chinese Patent Application No. 202210548904.2 discloses a parking function testing method, electronic device, and storage medium. The electronic device acquires vehicle bus data to obtain data corresponding to vehicle parameters generated when the vehicle operates the parking function to be tested. Based on this data and parking test conditions, a parking test time range is obtained. Within this time range, based on the parking test objective and related data, the parking test result is obtained and visualized. This allows the electronic device to re-acquire the operating status of internal devices during the vehicle's parking function operation using vehicle bus data, and to centrally process the aforementioned bus data using different preset parking test conditions and objectives. However, the technical solution disclosed in this patent document also fails to solve the aforementioned technical problem.

[0006] A static testing device for the parking function of an electric drive gearbox is provided, with particular emphasis on how to improve the accuracy of the test results. Utility Model Content

[0007] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a static testing device for the parking function of an electric drive gearbox, with the purpose of improving the accuracy of the test results.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a static testing device for the parking function of an electric drive gearbox, including a motherboard for mounting a prototype, a constant temperature oil supply system for supplying oil to the prototype, a temperature sensor and a flow sensor installed on the oil supply pipeline, a parking motor for driving the parking mechanism of the prototype, and a host computer. The host computer is electrically connected to the parking motor and the constant temperature oil supply system. The prototype is provided with an oil inlet and an oil return port. The constant temperature oil supply system is connected to the prototype through the oil inlet and oil outlet, and is equipped with a regulating component for adjusting the temperature and flow rate of the lubricating oil. The temperature sensor and flow sensor are arranged on the pipeline between the constant temperature oil supply system and the prototype.

[0009] The parking motor is connected to the host computer via a CAN bus.

[0010] The temperature sensor includes a first temperature sensor arranged upstream of the oil inlet and a second temperature sensor arranged downstream of the oil return port.

[0011] The flow sensor is arranged in the oil supply line between the first temperature sensor and the oil inlet.

[0012] The regulating assembly includes a heating unit for regulating the temperature of the lubricating oil and a flow regulating unit for regulating the flow rate of the lubricating oil. The heating unit includes an electric heater and a heating water tank. The electric heater is located inside the heating water tank and is immersed in the lubricating oil for heating the lubricating oil. The flow regulation unit is a control valve.

[0013] This utility model discloses a static testing device for the parking function of an electric drive gearbox. By fixing the prototype to a motherboard and using a parking motor to drive the parking mechanism to complete the parking and release actions in a ratchet-stationary state, it can simulate the static working conditions of the parking mechanism and meet testing requirements. At the same time, with the help of the adjustment components of the constant temperature oil supply system, combined with the temperature and flow sensors on the pipeline, the lubricating oil temperature and flow can be accurately adjusted. Furthermore, the host computer can send control commands in real time to ensure that the test environment is consistent with the actual working conditions, thereby improving the authenticity of the test data and the accuracy of the test results. Attached Figure Description

[0014] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram of the static testing device for the parking function of the electric drive gearbox of this utility model; Figure 2 This is a schematic diagram of a constant temperature oil supply system; The diagram is labeled as follows: 1. Motherboard, 2. Prototype, 3. Oil return port, 4. Parking ratchet, 5. Oil inlet, 6. Parking motor, 7. Constant temperature oil supply system, 701. Bracket, 702. Water pump, 703. Control valve, 704. Heating water tank, 705. Electric heater, 706. Sight glass, 707. Pressure sensor, 708. Thermometer, 709. Air inlet, 710. Air vent valve, 711. Expansion tank, 712. Control cabinet, 713. Plate heat exchanger, 8. First temperature sensor, 9. Flow sensor, 10. Second temperature sensor, 11. Host computer. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.

[0016] like Figure 1As shown, this utility model provides a static testing device for the parking function of an electric drive gearbox, including a motherboard 1 for mounting a prototype, a constant temperature oil supply system 7 for supplying oil to the prototype, a temperature sensor and a flow sensor 9 installed on the oil supply pipeline, a parking motor 6 for driving the parking mechanism of the prototype, and a host computer 11. The host computer 11 is electrically connected to the parking motor 6 and the constant temperature oil supply system 7. The prototype has an oil inlet 5 and an oil return port 3. The parking motor 6 is driven by the parking mechanism inside the prototype and is used to drive the parking mechanism to perform parking and release actions when the ratchet is stationary. The host computer 11 is electrically connected to the parking motor 6 and the constant temperature oil supply system 7 and is used to send parking and release control commands to the parking motor 6 and to send oil temperature and flow rate adjustment commands to the constant temperature oil supply system 7.

[0017] Specifically, such as Figure 1 As shown, the constant temperature oil supply system 7 is connected to the oil inlet 5 and the oil return port 3 of the prototype, respectively. The constant temperature oil supply system 7 is equipped with a regulating component for adjusting the temperature and flow of the lubricating oil. The temperature sensor and the flow sensor 9 are arranged on the pipeline between the constant temperature oil supply system 7 and the prototype.

[0018] In this embodiment, the parking motor 6 is connected to the host computer 11 via a CAN bus. The parking motor 6 is controlled by the host computer 11 via CAN communication to request parking and release. The parking motor 6 drives the parking pawl to engage and disengage with the ratchet, realizing the parking and release actions.

[0019] In this embodiment, as Figure 1 As shown, the temperature sensors include a first temperature sensor 8 located upstream of the oil inlet 5 and a second temperature sensor 10 located downstream of the oil return port 3. A flow sensor 9 is arranged in the oil supply line between the first temperature sensor 8 and the oil inlet 5. The first temperature sensor 8 monitors the temperature of the lubricating oil entering the prototype, the second temperature sensor 10 monitors the temperature of the lubricating oil exiting the prototype, and the flow sensor 9 monitors the real-time flow rate of the lubricating oil entering the prototype. The constant temperature oil supply system 7 can control the temperature and flow rate of the lubricating oil. The lubricating oil flows through the first temperature sensor 8 and the flow sensor 9, enters the oil inlet 5 of the prototype, lubricates the parking mechanism, and flows through the oil return port 3 of the prototype, through the second temperature sensor 10, and returns to the constant temperature oil supply system 7.

[0020] In this embodiment, as Figure 2As shown, the constant temperature oil supply system 7 also includes an expansion tank 711, a water pump 702, and a plate heat exchanger 713. The regulating components include a heating unit for regulating the temperature of the lubricating oil and a flow regulating unit for regulating the flow rate of the lubricating oil. The heating unit includes an electric heater 705 and a heating tank 704. The heating tank 704 contains the lubricating oil. The electric heater 705 is located in the inner cavity of the heating tank 704 and is immersed in the lubricating oil. It is activated after receiving a control signal to heat the lubricating oil and raise its temperature to the set value.

[0021] like Figure 2 As shown, the expansion tank 711 replenishes the lubricating oil for the entire system and compensates for the volume change of the oil due to temperature variations. The expansion tank 711 is connected via a pipeline to the upper end of the heating tank 704 or a high point in the main circulation loop to compensate for oil volume changes and provide a replenishment inlet. The outlet of the heating tank 704 is connected via a pipeline to the inlet of the water pump 702, which provides circulation power for the entire oil circuit. The flow regulation unit is a control valve 703, which regulates the flow rate of the lubricating oil in the circuit. The outlet of the water pump 702 is connected to the inlet of the control valve 703, and the outlet of the control valve 703 is connected to the oil inlet of the plate heat exchanger 713. The oil outlet of the plate heat exchanger 713 is connected via a pipeline to the oil inlet 5 of the prototype. A first temperature sensor 8 and a flow sensor 9 are installed in the pipeline. After the oil lubricates the parking mechanism inside the prototype, it flows out from the oil return port 3 of the prototype and finally returns to the heating water tank 704 to complete the circulation.

[0022] In this embodiment, as Figure 2 As shown, the control valve 703 is arranged on the oil supply pipeline between the constant temperature oil supply system 7 and the prototype, and is used to adjust the flow cross section of the pipeline by adjusting the valve opening to regulate the delivery flow of lubricating oil.

[0023] The plate heat exchanger 713 is connected in series in the circulation pipeline of the constant temperature oil supply system 7, and the plate heat exchanger 713 has an independent cooling water side channel. The plate heat exchanger 713 is provided with a cooling water inlet interface and a cooling water outlet interface, which are used to connect external cooling water and lubricating oil to exchange heat to achieve cooling.

[0024] The static testing device for the parking function of the electric drive reduction gearbox with the above structure works on the following principle: During the test, it is necessary to control the parking and unlocking states of the parking mechanism, and control the temperature and flow of the lubricating oil in real time through the host computer 11 to meet the experimental requirements.

[0025] 1. During the test, the ratchet does not rotate, and the parking motor 6 drives the pawl to achieve parking and release.

[0026] 2. The host computer 11 requests oil temperature and flow rate from the constant temperature oil supply system 7 to meet the test requirements.

[0027] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A static testing device for the parking function of an electric drive reduction gearbox, characterized in that, It includes a motherboard for mounting the prototype, a constant temperature oil supply system for supplying oil to the prototype, a temperature sensor and a flow sensor installed on the oil supply pipeline, a parking motor for driving the parking mechanism of the prototype, and a host computer. The host computer is electrically connected to the parking motor and the constant temperature oil supply system. The prototype is equipped with an oil inlet and an oil return outlet. The constant temperature oil supply system is connected to the prototype through the oil inlet and oil outlet, and is equipped with a regulating component for adjusting the temperature and flow rate of the lubricating oil. The temperature sensor and flow sensor are arranged on the pipeline between the constant temperature oil supply system and the prototype.

2. The static testing device for the parking function of the electric drive reduction gearbox according to claim 1, characterized in that, The parking motor is connected to the host computer via a CAN bus.

3. The static testing device for the parking function of the electric drive reduction gearbox according to claim 1, characterized in that, The temperature sensor includes a first temperature sensor arranged upstream of the oil inlet and a second temperature sensor arranged downstream of the oil return port.

4. The static testing device for the parking function of the electric drive reduction gearbox according to claim 3, characterized in that, The flow sensor is arranged in the oil supply line between the first temperature sensor and the oil inlet.

5. The static testing device for the parking function of an electric drive reduction gearbox according to any one of claims 1 to 4, characterized in that, The regulating assembly includes a heating unit for regulating the temperature of the lubricating oil and a flow regulating unit for regulating the flow rate of the lubricating oil. The heating unit includes an electric heater and a heating water tank. The electric heater is located inside the heating water tank and is immersed in lubricating oil for heating the lubricating oil.

6. The static testing device for the parking function of the electric drive reduction gearbox according to claim 5, characterized in that, The flow regulation unit is a control valve.

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