CN109489877B - Method for testing power flow of transmission link of comprehensive transmission device of road test vehicle - Google Patents
Method for testing power flow of transmission link of comprehensive transmission device of road test vehicle Download PDFInfo
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- CN109489877B CN109489877B CN201811520686.1A CN201811520686A CN109489877B CN 109489877 B CN109489877 B CN 109489877B CN 201811520686 A CN201811520686 A CN 201811520686A CN 109489877 B CN109489877 B CN 109489877B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
- G01L3/242—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying torque and velocity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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Abstract
The invention discloses a method for testing power flow of a transmission link of a comprehensive transmission device of a road test vehicle, and belongs to the technical field of vehicle testing. The test method comprises the steps of firstly, selecting torque test points and rotating speed test points of a trunk and a branch in a transmission link in a vehicle transmission device; then measuring the torque and the rotating speed of key transmission parts on a trunk and branches of a transmission link in the transmission device in real time in the road test process of the vehicle; the transmission power flow of the transmission link of the transmission is converted by the product of the torque and the rotating speed at the same moment. The invention can solve the problem of real-time test of the power flow of the transmission link of the vehicle transmission device in the real vehicle road test process.
Description
Technical Field
The invention relates to the technical field of vehicle testing, in particular to a real-time testing method for power flow of a transmission link of a vehicle road test transmission device.
Background
The vehicle comprehensive transmission device transmits power flow to transmit the power of the power device to the driving device, and realizes the functions of advancing, retreating, accelerating, climbing, steering and the like of the vehicle through the characteristic expansion of power transmission, torque and rotating speed. Through the research on the power flow, the power loss of the transmission device can be effectively reduced, the net power is improved, the flow direction and the size distribution of the power flow of the transmission link are controlled, and various performance indexes of the vehicle are improved on the premise of not influencing the performance of an engine.
For many years, vehicle designers have conducted a great deal of research on design and optimization of power flow of a transmission link of a transmission device, but due to lack of real-time road test data, a technical bottleneck is formed, deep research on power flow of the transmission link is restricted, technical progress is hindered, past empirical formulas and calculation methods cannot represent a multi-dimensional power loss mechanism of a complex transmission device of a vehicle, and therefore the consideration factor is few, the result is single, and errors of calculated values and actual measurement results are large. Particularly for a high-power transmission device with a complex structure, in the power transmission process of a transmission system, a clutch, a gear shaft system, a rotating member and the like all work in a flow field formed by lubricating oil, a fluid and a solid working interface are highly coupled, the rotating speed of the member, the fluid flow rate and the flow field form change along with the increase of the rotating speed of the transmission system, so that the power loss change is caused, and the power flow of a transmission link is more difficult to calculate. Therefore, power flow data of each transmission link of the transmission device under different road conditions and vehicle working conditions needs to be obtained by measuring the power flow of the transmission link of the road test vehicle, so that simulation boundary conditions and model verification conditions can be provided for a vehicle designer, technical bottlenecks are broken, the restriction of empirical formulas is avoided, and the product performance is effectively improved.
Testing of integrated transmission power flow the conventional method is the bench test method. The comprehensive transmission device is usually placed on a special rack, and the dynamic link power flow of the comprehensive transmission device under various working conditions is obtained by using the instrument and equipment test of the rack. In fact, limited to the limitation of the performance of the bench, the working condition of the bench is only the simulated actual working condition, which is greatly different from the real road test working condition, so that the power flow test data of the dynamic link of the integrated transmission device under the road test working condition is used for supporting the design. The main reason why the test data of the dynamic link power flow of the integrated transmission device cannot be obtained for a long time is that the test technical means and the test method cannot adapt to the internal test environment of the integrated transmission device: the method is characterized in that the method is high in temperature, high in vibration, large in impact, full of oil gas, narrow in space, rotated at high speed by a test piece, and closed by a box body, torque and rotating speed measuring points on a plurality of transmission links are required to be obtained, rotating speed and torque are synchronously sampled, the high sampling rate of each measuring point is also kept, and in addition, vehicle working condition parameters are required to be introduced, so that the method is a great challenge to the test.
Disclosure of Invention
In view of the above, the invention provides a method for testing power flow of a transmission link of a comprehensive transmission device of a road test vehicle, which can solve the problem of real-time testing of power flow of the transmission link of the vehicle transmission device in the real-vehicle road test process.
A method for testing power flow of a transmission link of a comprehensive transmission device of a road test vehicle comprises the following implementation steps:
the method comprises the following steps: selecting torque measuring points and rotating speed measuring points of a trunk and a branch in a transmission link in a vehicle transmission device;
step two: measuring the torque and the rotating speed of key transmission parts on a trunk and branches of a transmission link in a transmission device in real time in the road test process of a vehicle;
step three: the transmission power flow of the transmission link of the transmission is converted by the product of the torque and the rotating speed at the same moment.
Furthermore, the transmission link is a power flow passage of the transmission device, the transmission link main body is a transmission device main input system, and the transmission link branches are transmission links outside the transmission link main body and comprise a plurality of stage branches.
Further, the key transmission parts are main parts of the transmission link, the parts bear the transmission of the power of the transmission link, and the power of the transmission link is transmitted to the next transmission link through the parts; the key transmission parts in each transmission link are composed of one or more independent parts, each part needs to be tested for torque and rotating speed independently, and the power flow of the transmission link is obtained through data processing.
Furthermore, the torque measuring point is selected, the key transmission part is large in deformation and only receives the position acted by the torque force, and a sufficient space is provided for installing a rotating circuit part of the torque testing device through circuit customization and part modification; the position of the measuring point is selected from a position with relatively constant temperature, relatively small vibration impact and relatively mild test environment.
Furthermore, the rotating speed measuring point can objectively reflect the instantaneous rotating speed position of the part, and the rotating speed measuring point can have enough space for installing the rotating speed testing device through circuit customization and part modification; the position of the measuring point is selected from the positions with relatively constant temperature and relatively small vibration impact.
Furthermore, the torque test adopts a torque test system combining power supply wireless transmission and data wireless transmission, and can complete the uninterrupted torque test of key transmission parts in a transmission link of the comprehensive transmission device in the vehicle road test process; in order to adapt to the working state of high-speed rotation of the key transmission part and a narrow space test environment, the power supply wireless transmission and the data wireless transmission are combined into a set of torque test device for testing the torque of the key transmission part; the torque testing device is divided into three parts: the rotary module is arranged in a rotary key transmission part and synchronously moves along with the rotary key transmission part; the signal demodulation module is arranged near the key transmission part and at a position which is relatively static with the box body; the acquisition and storage device is arranged at a relatively mild position of the environment; the method for directly measuring the torque of the transmission part is adopted, a sensitive end is pasted on the part, the microstrain generated on the surface of the part under the torque is sensed, the microstrain is converted into an electric signal by a rotating module and is transmitted to a signal demodulating module in a short-distance wireless mode, the received electric signal is converted into a standard electric signal capable of being transmitted in a long distance by the signal demodulating module to be received and processed by an acquisition and storage device, and the method for installing the rotating module on the key transmission part usually adopts an embedding or semi-embedding mode.
Furthermore, the embedded or semi-embedded mode completely or partially embeds the customized rotating module into the transmission part and the surrounding parts thereof, and synchronously moves with the key transmission part and the surrounding parts thereof, so that the performance and normal work of the transmission part and the surrounding parts thereof are not influenced.
Furthermore, the power supply wireless transmission is provided by an external power supply in a wireless mode, comprises an electromagnetic induction magnetic coupling mode, an electromagnetic wave radio frequency mode, a magnetic resonance mode, an electric field coupling mode and a microwave mode, is designed into a high-temperature-resistant, vibration-resistant and small-structure package, is embedded into a hole or a groove, or is mounted in or near a transmission part in a sticking or fastening mode, rotates or reciprocates along with the transmission part, does not affect the normal work of the transmission part, and does not affect the performance of the transmission part.
Further, the rotating speed testing method directly or indirectly tests the rotating speed of the transmission part, and the direct test is to directly sense the rotating speed of the transmission part in the working process by using a rotating speed sensor; the indirect test is to directly extract the rotating speed of the transmission part in the working process from the vehicle bus or derive the rotating speed from the rotating speed of the related part.
Has the advantages that:
the method for testing the power flow of the transmission link of the comprehensive transmission device of the road test vehicle can solve the problem of real-time testing of multiple transmission links of the road test transmission device, and the obtained information can be used as a fault monitoring parameter and can also be used for obtaining parameters such as road test power transmission efficiency of the comprehensive transmission device, power loss of each transmission link and the like.
Drawings
FIG. 1 is a schematic power flow diagram of a transmission drive link of a transmission.
Wherein, 1-input power flow, 2-pump set power flow, 3-straight driving power flow, 4-auxiliary system power flow, 5-fan power flow, 6-steering power flow, 7-left output power flow and 8-right output power flow.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a method for testing power flow of a transmission link of a comprehensive transmission device of a road test vehicle, which simplifies the part relation of the comprehensive transmission device according to a design calculation specification to obtain a part relation block diagram of the comprehensive transmission device, and is shown in figure 1. The transmission link of the integrated transmission is determined by the integrated transmission component relationship diagram and the gear operating conditions.
The power flow of the transmission link of the integrated transmission determines the power flow direction of each transmission link together according to the structure of the transmission link and the parts of each transmission link. The transmission link trunk is a transmission device main input system and corresponds to the power flow trunk, and the transmission link branches are branches behind the trunk and correspond to the power flow branches to obtain a power flow schematic diagram. An input power flow 1 is formed between a power input system and a transmission input system, a pump group power flow 2, a straight driving power flow 3 and an auxiliary system power flow 4 are respectively formed between the transmission input system and a pump group, a straight driving power flow 3 and an auxiliary system power flow 4, a steering power flow 6 and a fan power flow 5 are respectively formed between the auxiliary system and a steering system and a fan system, and a left output power flow 7 and a right output power flow 8 are respectively formed between the direct driving system and a left output system and a right output system.
Each transmission link is provided with a key transmission part as a carrier for power flow test, the key transmission part is used for transmitting the power of the transmission link, and the power of the transmission link is transmitted to the next transmission link branch through the key transmission part. Some transmission links are formed by jointly completing power transmission by a plurality of parts, and the parts are respectively used as key transmission parts. Each key transmission part needs to test the torque and the rotating speed independently, obtain the torque and rotating speed data at the same moment, and obtain the power flow of the transmission link through data processing.
Selection principle of key transmission parts: 1) the part undertakes the transfer of all power of the drive link; 2) the testing system rotating module can be installed after modification; 3) the test environments of temperature, pressure, vibration and the like meet the requirements of a torque test system; 4) the rotating speed data can be obtained, or a rotating speed testing system is directly installed, or the rotating speed testing data is indirectly obtained; 5) one part is selected as the tested part as much as possible.
The key transmission parts are usually in a rotating state in the road test process, and the torque test of the key transmission parts adopts a torque test system combining power supply wireless transmission and data wireless transmission, so that the uninterrupted torque test of the key transmission parts of the transmission link in the comprehensive transmission box in the road test process can be completed. The power supply wireless transmission and the data wireless transmission are usually combined into a set of torque testing device, which is designed into two or more testing modules for adapting to the dynamic balance requirements of narrow installation space and high-speed rotation. The torque testing device is divided into three parts: the device comprises a rotating module, a signal demodulation module and a collecting and storing device. The signal demodulation module converts an external power supply into electric field or magnetic field energy, the electric field or magnetic field energy is wirelessly transmitted to the rotation module through the antenna, and the rotation module converts the received energy into electric energy required by the rotation module and provides a power supply for the front-end sensitive element. The front-end sensing element is adhered to the surface of the key transmission part and used for sensing micro-strain generated on the surface of the part, the sensing element and the key transmission part are deformed synchronously, the deformation is converted into an electric signal by the rotating module, the signal is wirelessly transmitted to the signal demodulating module through data, and the signal is converted into a conventional remote communication form by the signal demodulating module and is collected and stored by the remote-end collecting and storing device.
Analyzing the structure, shape and motion mode of the key transmission part of each transmission link and the relation between the key transmission part and the surrounding parts, and drawing up the torque measuring point position, the torque testing device installation scheme and the rotating speed signal acquisition scheme of the key transmission part. The torque measuring point selects the position where the part deformation is as large as possible and only the torque is acted, and the torque testing device rotating module has enough space for installation through measures such as circuit customization, packaging customization, part modification and the like. The rotating speed measuring point selection can objectively reflect the instantaneous rotating speed position of the key transmission part, and the rotating speed testing device has enough space for installation by means of circuit customization, packaging customization, part modification and the like. The position of the measuring point is selected from the positions with relatively constant temperature and relatively small vibration impact.
The key transmission part and the test system are integrally designed and reformed, and the principle is that the functions and the performances of the key transmission part borne by the transmission device are not influenced, and the test system can normally work. The torque testing device and the power supply device are used as rotating modules to be installed on key transmission parts. The on-axis circuit structure and the package of the test system are customized according to the structure of the main part and the characteristics of the working space of the main part, the main part is subjected to limited remanufacturing, the on-axis circuit is fixed and packaged in an embedding or semi-embedding mode and moves synchronously with the transmission part and the surrounding parts of the transmission part, and the performance and the normal work of the transmission part and the surrounding parts of the transmission part are not influenced. The circuit of the receiving part of the wireless power supply device of the customized torque test system on-shaft circuit is fused with the on-shaft circuit and is packaged and embedded or semi-embedded in the main part or the surrounding parts thereof, and the wireless power supply device can also be independently installed on the main part or the surrounding parts thereof. . The remanufacture of key transmission parts needs to maintain the original performance and functions of the key transmission parts, and the installation of the rotating module on the key transmission parts needs to consider the problem of the rotating dynamic balance caused by the additional weight.
The wireless power supply is used for adapting to the rotation characteristic of a tested piece, can meet the long-term performance and the continuity of a vehicle road test, generally comprises various modes such as an electromagnetic induction magnetic coupling mode, an electromagnetic wave radio frequency mode, a magnetic resonance mode, an electric field coupling mode and a microwave mode, is designed into a high-temperature-resistant and small-structure, is arranged in or near a transmission part, rotates or reciprocates along with a key transmission part, and does not influence the normal work and the performance of the transmission part.
The rotation speed test adopts a direct or indirect test method. The direct test is to directly sense the rotating speed of the key transmission part in the working process by using a rotating speed sensor. The indirect test is to directly extract the rotating speed of the key transmission part in the working process from the vehicle bus or deduce the rotating speed of the key transmission part from the rotating speed of the related part.
And enabling the torque and rotating speed test signals of the main parts of each transmission link to enter the same acquisition and storage device for synchronous acquisition and storage. The power of the transmission link is calculated by using the torque and rotating speed values of the same main part at the same moment, the power is obtained by adopting a traditional mechanical power calculation formula, and the power flow direction is analyzed according to the working condition of the transmission device at the moment.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for testing power flow of a transmission link of a comprehensive transmission device of a road test vehicle is characterized by comprising the following implementation steps:
the method comprises the following steps: selecting torque measuring points and rotating speed measuring points of a trunk and a branch in a transmission link in a vehicle transmission device;
step two: measuring the torque and the rotating speed of key transmission parts on a trunk and branches of a transmission link in a transmission device in real time in the road test process of a vehicle;
step three: the transmission power flow of a transmission link of the transmission device is converted by the product of the torque and the rotating speed at the same moment;
the transmission link is a passage for power flow of the transmission device, the transmission link main body is a transmission device main input system, and the transmission link branches are transmission links outside the transmission link main body and comprise a plurality of stages of branches;
the key transmission parts are main parts of the transmission link, the parts bear the transmission of the power of the transmission link, and the power of the transmission link is transmitted to the next transmission link through the parts; the key transmission parts in each transmission link are composed of one or more independent parts, each part independently tests the torque and the rotating speed of the part, and the power flow of the transmission link is obtained through data processing;
the torque measuring point selects a position where a key transmission part is large in deformation and only acted by torque force, and a sufficient space is provided for mounting a rotating circuit part of the torque testing device through circuit customization and part modification; selecting a position with constant temperature, small vibration impact and mild test environment at the position of a test point;
the rotating speed measuring point can objectively reflect the instantaneous rotating speed position of the part, and the rotating speed measuring point can have enough space for installing the rotating speed testing device through circuit customization and part modification; the position of the measuring point is selected from a position with constant temperature and small vibration impact.
2. The power flow testing method for the transmission link according to claim 1, characterized in that the torque testing adopts a torque testing system combining power supply wireless transmission and data wireless transmission, and can complete uninterrupted torque testing of key transmission parts in the transmission link of the integrated transmission device in the vehicle road test process; in order to adapt to the working state of high-speed rotation of the key transmission part and a narrow space test environment, the power supply wireless transmission and the data wireless transmission are combined into a set of torque test device for testing the torque of the key transmission part; the torque testing device is divided into three parts: the rotary module is arranged in a rotary key transmission part and synchronously moves along with the rotary key transmission part; the signal demodulation module is arranged near the key transmission part and at a position which is relatively static with the box body; the acquisition and storage device is arranged at a relatively mild position of the environment; the method for directly measuring the torque of the transmission part is adopted, the sensitive end is pasted on the part, the microstrain generated on the surface of the part under the torque is sensed, the microstrain is converted into an electric signal by the rotating module and is transmitted to the signal demodulating module in a short-distance wireless mode, the received electric signal is converted into a standard electric signal capable of being transmitted in a long distance by the signal demodulating module and is received and processed by the collecting and storing device, and the method for installing the rotating module on the key transmission part adopts an embedding or semi-embedding mode.
3. The method for testing power flow of a transmission link of claim 2, wherein the embedding or semi-embedding is performed by embedding the customized rotating module into the transmission component and its surrounding components, and synchronously moving with the key transmission component and its surrounding components without affecting the performance and normal operation of the transmission component and its surrounding components.
4. The method for testing power flow of a transmission link according to claim 3, wherein the wireless transmission of power supply is provided by an external power supply in a wireless manner, including an electromagnetic induction magnetic coupling manner, an electromagnetic wave radio frequency manner, a magnetic resonance manner, an electric field coupling manner and a microwave manner, and is designed into a high temperature resistant, vibration resistant and small-sized package, and the package is embedded into a hole or a slot, or is mounted inside or near the transmission part in a sticking or fastening manner, and rotates or reciprocates along with the transmission part without affecting the normal operation of the transmission part and without affecting the performance of the transmission part.
5. The power flow testing method for the transmission link according to claim 1, wherein the rotation speed testing method directly or indirectly tests the rotation speed of the transmission part, and the direct test is to directly sense the rotation speed of the transmission part in the working process by using a rotation speed sensor; the indirect test is to directly extract the rotating speed of the transmission part in the working process from the vehicle bus or derive the rotating speed from the rotating speed of the related part.
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| CN110555238A (en) * | 2019-08-02 | 2019-12-10 | 北京航空航天大学 | automatic wheel key parameter optimizing method and system |
| CN111735564A (en) * | 2020-07-01 | 2020-10-02 | 中国北方车辆研究所 | Method for measuring power flow of power compartment of tracked vehicle |
| CN111706541A (en) * | 2020-07-01 | 2020-09-25 | 中国北方车辆研究所 | Method for measuring torque of cooling fan of tracked vehicle |
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