CN109883694B - Power-split hydraulic mechanical composite transmission system electric loading multifunctional test bench and application thereof - Google Patents

Power-split hydraulic mechanical composite transmission system electric loading multifunctional test bench and application thereof Download PDF

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Publication number
CN109883694B
CN109883694B CN201910097716.0A CN201910097716A CN109883694B CN 109883694 B CN109883694 B CN 109883694B CN 201910097716 A CN201910097716 A CN 201910097716A CN 109883694 B CN109883694 B CN 109883694B
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transmission unit
power
input end
hydraulic
rotating speed
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CN109883694A (en
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万丽荣
戴汉政
曾庆良
孙志远
田明倩
刘文婷
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Shandong University of Science and Technology
Taishan University
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Shandong University of Science and Technology
Taishan University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts
    • G01M13/02Gearings; Transmission mechanisms
    • G01M13/022Power-transmitting couplings or clutches

Abstract

The invention relates to an electric loading multifunctional test bench for a power division hydraulic mechanical composite transmission system and application thereof. The invention relates to an electric loading multifunctional test bench for a power-split hydraulic mechanical composite transmission system, which can realize the performance test of a hydraulic transmission unit of the hydraulic mechanical composite transmission system, test the transmission performance of the hydraulic transmission unit of the hydraulic mechanical composite transmission system by simulating the actual running working condition and the operating condition of an application vehicle, and realize the performance test of one-section and multi-section hydraulic mechanical composite transmission hydraulic transmission units.

Description

Power-split hydraulic mechanical composite transmission system electric loading multifunctional test bench and application thereof
Technical Field
The invention relates to an electric loading multifunctional test bench for a power division hydraulic mechanical composite transmission system and application thereof, which are suitable for acquiring performance parameters of a hydraulic transmission unit and testing the proportion of mechanical and hydraulic power flows of the transmission system and belong to the technical field of engineering machinery.
Background
The working vehicles such as engineering machinery, tractors and the like have the characteristics of large transmission power, complex working condition and large speed adjusting range, and have higher and higher requirements on the transmission efficiency, gear shifting comfort and operation automation level of a transmission system along with the development of the society and the continuous progress of the technology. The hydraulic mechanical stepless speed change transmission is a power division hydraulic mechanical composite transmission form which transmits power by combining hydraulic power flow and mechanical power flow, can realize high-efficiency high-power transmission through mechanical transmission, realizes stepless speed change through hydraulic transmission, and has good application prospect on high-power vehicles. The hydraulic mechanical stepless speed changer combines the advantages of good stepless speed regulation performance of hydrostatic transmission and higher steady-state efficiency of mechanical transmission, thereby obtaining a speed change transmission device which has stepless speed change performance, higher efficiency and favorable distribution of high-efficiency areas. Therefore, the design and development of the high-performance hydraulic mechanical continuously variable transmission are the key points of the technical research and application of the hydraulic mechanical composite transmission system to the high-power vehicle.
The hydraulic mechanical stepless speed changer is composed of a mechanical transmission unit, a pump-motor hydraulic stepless speed change transmission unit, a planetary gear mechanism for dividing or converging power, an automatic speed change electronic control device, a driving system and the like. When the transmission ratio of the mechanical speed change mechanism is determined, the transmission ratio of the hydraulic stepless speed change unit is adjusted, so that the transmission ratio of the hydraulic mechanical composite transmission system can realize stepless change in a certain range, power is output after split flow, stepless speed change and confluence, and high-power high-efficiency stepless speed change transmission is realized. Therefore, the power-split hydraulic mechanical composite transmission system has the advantages of high transmission efficiency of a pure mechanical transmission system and stepless speed change of the pure hydraulic transmission system. However, the overall efficiency of the transmission system is determined by the respective efficiencies of the hydraulic and mechanical power splitting flows of the compound transmission and the distribution ratios thereof, the transmission efficiency characteristics of the mechanical transmission unit are relatively stable, but the transmission efficiency of the hydrostatic transmission unit is relatively low compared with the mechanical transmission, components such as a hydraulic pump, a hydraulic motor, a control valve bank, a connecting pipeline and the like which form the hydrostatic transmission unit all have the problem of efficiency in the whole system unit, and the volumetric efficiency and the mechanical efficiency of the pump and the motor which influence the overall transmission efficiency of the unit constantly change with the change of speed, so that the transmission efficiency is unstable. Therefore, on the premise of keeping the stepless speed change capability of the hydraulic transmission unit, the efficiency peak value is improved, and the high-efficiency area under the common working condition is enlarged, so that the transmission efficiency and the service performance of the hydraulic mechanical composite transmission system are ensured.
At present, hydraulic mechanical stepless transmissions are designed and developed and performance tests are carried out on special test beds or devices after trial production of products are finished, and through a series of test tests, hydraulic transmission units and mechanical transmission units of the trial production products are often not optimal design matching schemes, even the trial production of the products can be repeated, so that the cost of product design and development is higher, the period is longer, and a large amount of manpower and material resources are consumed. Although the development of the current computer simulation and virtual prototype technology greatly shortens the design cycle and the cost of products, the uncertainty of product development can be caused due to the inconsistency between simulation conditions and real working conditions.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an electric loading multifunctional test bed for a power division hydraulic mechanical composite transmission system.
The invention also provides a working method of the power-split hydraulic mechanical composite transmission system electric loading multifunctional test bed.
The technical scheme of the invention is as follows:
a multifunctional test bench for electric loading of a power-split hydraulic mechanical compound transmission system comprises a mechanical part and a control part, wherein the mechanical part comprises:
the mechanical part includes:
the hydraulic transmission unit comprises a hydraulic transmission unit power input end direct current motor, a hydraulic transmission unit power input end electromagnetic clutch, a hydraulic transmission unit input end rotating speed and torque sensor, a hydraulic transmission unit to be tested and a hydraulic transmission unit output end rotating speed and torque sensor, wherein the input ends of the direct current motor, the electromagnetic clutch and the hydraulic transmission unit power input end are sequentially connected;
the input end of the mechanical transmission unit is sequentially connected with an alternating current variable frequency motor, an electromagnetic clutch and a rotating speed and torque sensor;
the rotating speed and torque sensor at the output end of the hydraulic transmission unit and the rotating speed and torque sensor of the mechanical transmission unit are in transmission connection with an input shaft of the confluence mechanism respectively; an output shaft of the confluence mechanism is sequentially connected with an output end rotating speed torque sensor and an output end direct current motor in a transmission way;
the control section includes:
the industrial control computer, the signal acquisition unit and the programmable controller are respectively connected with the industrial control computer;
the signal acquisition unit is connected with the tested hydraulic transmission unit through the pressure sensor and the flow sensor; the signal acquisition unit is also respectively connected with a rotating speed and torque sensor at the input end of the hydraulic transmission unit, a rotating speed and torque sensor at the output end of the hydraulic transmission unit, a rotating speed and torque sensor at the mechanical transmission unit and a rotating speed and torque sensor at the output end;
the programmable controller is respectively connected with a D/A module of the input end PLC, a D/A module of the output end PLC, a power input end electromagnetic clutch of the hydraulic transmission unit, a power input end electromagnetic clutch of the mechanical transmission unit and a speed regulation controller; the D/A module of the input end PLC is respectively connected with the direct current motor at the power input end of the hydraulic transmission unit and the alternating current variable frequency motor at the power input end of the mechanical transmission unit through a direct current motor speed regulation controller at the power input end of the hydraulic transmission unit and an alternating current variable frequency motor frequency converter at the power input end of the mechanical transmission unit; the D/A module of the output end PLC is connected with the output end DC motor through an output end DC motor speed regulation controller; the speed regulation controller is respectively connected with the confluence mechanism and the tested hydraulic transmission unit.
Preferably, the direct current motor at the power input end of the hydraulic transmission unit, the alternating current variable frequency motor at the power input end of the mechanical transmission unit and the direct current motor at the output end of the mechanical transmission unit are all connected with a power supply.
Preferably, the industrial control computer is also respectively connected with an alarm, a display and a test bed working state indicator lamp.
Preferably, the direct current motor at the power input end of the hydraulic transmission unit is connected with one end of the electromagnetic clutch at the power input end of the hydraulic transmission unit through a coupler, and the rotating speed and torque sensor at the output end of the hydraulic transmission unit is in transmission connection with the coupling shaft of the hydraulic transmission unit of the confluence mechanism.
Preferably, the alternating-current variable-frequency motor at the power input end of the mechanical transmission unit is connected with one end of the electromagnetic clutch at the power input end of the mechanical transmission unit through a coupler, and the other end of the electromagnetic clutch at the power input end of the mechanical transmission unit is in transmission connection with the mechanical transmission unit coupling shaft of the confluence mechanism through the coupler.
Preferably, the confluence mechanism comprises a planetary gear train consisting of a planetary gear train ring gear, planetary gear trains and a planetary gear train planet carrier, and a fixed gear transmission formed by a gear A and a gear B, as well as a clutch L1, a clutch L2, a clutch L3, a clutch L4 and an executing element of the speed regulation controller; the hydraulic transmission unit connecting shaft, the mechanical transmission unit connecting shaft and the confluence mechanism output shaft extend outwards from the confluence mechanism. The advantage of this design is that the different working modes of hydraulic power flow and mechanical power flow can be realized to the joint of the different clutches of mechanism that converges to realize the hydraulic drive unit's of hydraulic pressure machinery compound transmission system cover full operating mode capability test.
Preferably, the test bed working state indicator lamp comprises a red lamp, a green lamp and a yellow lamp. The design has the effects that the indication contents of the lamps with different colors are as follows: the green light is set for indicating when the vehicle normally works, the yellow light is set for indicating when the vehicle is normally stopped, and the red light is set for indicating and alarming with sound when the vehicle is abnormally stopped.
A working method of an electric loading multifunctional test bench of a power division hydraulic mechanical composite transmission system comprises the following steps:
the working mode of the engaging states of four clutches in the confluence mechanism is controlled by a speed regulation controller:
(1) forward confluence power transfer mode for hydraulic transmission unit
When the clutch L2 and the clutch L4 are engaged, the coupling shaft of the mechanical transmission unit is connected with the planetary gear train gear ring, the coupling shaft of the hydraulic transmission unit is always connected with the sun gear of the planetary gear train through the fixed gear transmission formed by the gear A and the gear B, the output shaft of the confluence mechanism is connected with the planetary gear train planet carrier, and the rotating speed of the output shaft of the confluence mechanism is increased along with the increase of the rotating speed of the coupling shaft of the hydraulic transmission unit, so that the forward confluence transmission with the increase of the output rotating speed of the direct current motor at the power input end of the hydraulic transmission unit is formed;
(2) reverse confluence power transfer mode of hydraulic transmission unit
When the clutch L1 and the clutch L3 are engaged, the connecting shaft of the mechanical transmission unit is connected with the planet carrier of the planetary gear train, the connecting shaft of the hydraulic transmission unit is always connected with the sun gear of the planetary gear train through the fixed gear transmission formed by the gear A and the gear B, the output shaft of the confluence mechanism is connected with the gear ring of the planetary gear train, and the rotating speed of the output shaft of the confluence mechanism is reduced along with the increase of the rotating speed of the connecting shaft of the hydraulic transmission unit, so that the reverse confluence transmission with the reduction of the output rotating speed along with the increase of the output rotating speed of the direct current motor at the power;
(3) hydraulic drive unit single transfer power mode
When the clutch L1 is engaged and the clutch L2 is engaged, the transmission ratio of the planetary gear train is 1, the power transmission of the coupling shaft of the mechanical transmission unit is not carried out, the power input of the coupling shaft of the hydraulic transmission unit is carried out, and the power output of the output shaft of the confluence mechanism is carried out;
and under the two-stage control of the industrial control computer and the programmable controller, the direct current motor and the alternating current variable frequency motor realize different working modes:
(1) constant torque mode: under the regulation control of a control system and a control program, the motor in the mode is compared and regulated according to the feedback of an actual measured value of the torque and a given value, and the output torque of the motor is changed and maintained at the set value through the automatic regulation of a frequency converter and a controller according to a given control mode;
(2) constant rotation speed mode: under the regulation control of a control system and a control program, the motor in the mode is compared and regulated according to the feedback of an actual measurement value of the rotating speed and a given value, and the output rotating speed of the motor is automatically regulated in a given control mode through a frequency converter and a controller to be maintained at the set value;
(3) constant power mode: the motor keeps the output power of the motor at a given value under the regulation control of a control system and a control program;
the power characteristics of the engine are simulated to provide a power source for the test bed through a two-stage control mode of an industrial control computer and a programmable controller, so that the test working condition of the tested hydraulic transmission unit is closest to the actual use working condition, the test capability of the transmission system is improved, and the test range requirement is expanded.
The invention has the beneficial effects that:
1) the invention relates to an electric loading multifunctional test bench for a power-split hydraulic mechanical composite transmission system, which can realize the performance test of a hydraulic transmission unit of the hydraulic mechanical composite transmission system, test the transmission performance of the hydraulic transmission unit of the hydraulic mechanical composite transmission system by simulating the actual running working condition and the operating condition of an application vehicle, and realize the performance test of one-section and multi-section hydraulic mechanical composite transmission hydraulic transmission units.
2) The test bed can also provide a test platform for a performance test scheme of the hydrostatic transmission system and a performance test of the whole transmission.
3) The test bed adopts rotating speed closed-loop control, has good stability of testing the rotating speed, reasonable structural design, simplicity, reliability, safe and reliable operation and cost saving, can realize the function of reverse power generation by configuring the direct-current motor, and realizes the purpose of energy saving.
Drawings
FIG. 1 is a schematic structural view of an electric loading multifunctional test bed of the power-split hydraulic mechanical compound transmission system of the invention;
FIG. 2 is a schematic view of the transmission structure of the converging mechanism of the present invention;
FIG. 3 is a control schematic diagram of an electric loading multifunctional test bed of the power-split hydraulic mechanical compound transmission system of the invention;
wherein: 1-input end of D/A module of PLC; 2-programmable controller (PLC); 3-a test bed working state indicator lamp; 4-a display; 5-an alarm; 6-an industrial control computer; 7-a signal acquisition unit; 8-a flow sensor; 9-a pressure sensor; 10-D/A module of output PLC; 11-a speed-regulating controller; 12-output end DC motor speed regulation controller; 13-output end dc motor; 14-output rotation speed torque sensor; 15-a confluence mechanism; 16-a rotating speed and torque sensor at the output end of the hydraulic transmission unit; 17-the hydraulic drive unit under test; 18-mechanical transmission unit rotational speed torque sensor; 19-a rotating speed and torque sensor at the input end of the hydraulic transmission unit; 20-a mechanical transmission unit power input end electromagnetic clutch; 21-a power input end electromagnetic clutch of the hydraulic transmission unit; 22-a mechanical transmission unit power input end alternating current variable frequency motor; 23-a power supply; 24-a direct current motor at the power input end of the hydraulic transmission unit; 25-a direct current motor speed regulation controller at the power input end of the hydraulic transmission unit; 26-a frequency converter of an alternating-current variable-frequency motor at the power input end of the mechanical transmission unit;
151-hydraulic transmission unit coupling shaft; 152-gear a; 153-clutch L1; 154-clutch L2; 155-planetary gear train gear ring; 156-planetary gear train planet gear; 157-clutch L3; 158-clutch L4; 159 — planetary gear set carrier; 160-a converging mechanism output shaft; 161-planetary gear train sun gear; 162-gear B; 163-sun gear shaft; 164-mechanical transmission unit coupling shaft.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1 to fig. 2, the present embodiment provides a multifunctional test bench for electrical loading of a power-split hydraulic mechanical compound transmission system, which mainly includes two major aspects, namely a mechanical part and a control part:
the mechanical part includes:
the hydraulic transmission unit comprises a hydraulic transmission unit power input end direct current motor 24, a hydraulic transmission unit power input end electromagnetic clutch 21, a hydraulic transmission unit input end rotating speed torque sensor 19, a tested hydraulic transmission unit 17 and a hydraulic transmission unit output end rotating speed torque sensor 16, wherein the input ends of the hydraulic transmission unit power input end direct current motor, the hydraulic transmission unit power input end electromagnetic clutch 21, the hydraulic transmission unit input end rotating speed torque sensor, the tested;
the input end of the mechanical transmission unit is sequentially connected with an alternating current variable frequency motor 22, an electromagnetic clutch 20 and a rotating speed and torque sensor 18;
the rotating speed and torque sensor 16 at the output end of the hydraulic transmission unit and the rotating speed and torque sensor 18 of the mechanical transmission unit are respectively in transmission connection with an input shaft of the confluence mechanism 15; an output shaft of the confluence mechanism 15 is sequentially connected with an output end rotating speed torque sensor 14 and an output end direct current motor 13 in a transmission way;
the control section includes:
the industrial control computer 6, the signal acquisition unit 7, the Programmable Logic Controller (PLC)2 connected with industrial control computer 6 separately;
the signal acquisition unit 7 is connected with a tested hydraulic transmission unit 17 through a pressure sensor 9 and a flow sensor 8; the signal acquisition unit 7 is also respectively connected with a rotating speed and torque sensor 19 at the input end of the hydraulic transmission unit, a rotating speed and torque sensor 16 at the output end of the hydraulic transmission unit, a rotating speed and torque sensor 18 of the mechanical transmission unit and a rotating speed and torque sensor 14 at the output end;
the programmable controller 2 is respectively connected with a D/A module 1 of an input end PLC, a D/A module 10 of an output end PLC, a power input end electromagnetic clutch 21 of a hydraulic transmission unit, a power input end electromagnetic clutch 20 of a mechanical transmission unit and a speed regulation controller 11; the D/A module 1 of the input end PLC is respectively connected with a direct current motor 24 at the power input end of the hydraulic transmission unit and an alternating current variable frequency motor 22 at the power input end of the mechanical transmission unit through a direct current motor speed regulation controller 25 at the power input end of the hydraulic transmission unit and an alternating current variable frequency motor frequency converter 26 at the power input end of the mechanical transmission unit; the D/A module 10 of the output end PLC is connected with an output end DC motor 13 through an output end DC motor speed regulation controller 12; the speed controller 11 is connected with the confluence mechanism 15 and the tested hydraulic transmission unit 17 respectively.
The hydraulic transmission unit power input end direct current motor 24, the mechanical transmission unit power input end alternating current variable frequency motor 22 and the output end direct current motor 13 are all connected with a power supply 23.
A direct current motor 24 at the power input end of the hydraulic transmission unit is connected with one end of an electromagnetic clutch 21 at the power input end of the hydraulic transmission unit through a coupler, one end of a rotating speed and torque sensor 19 at the input end of the hydraulic transmission unit is connected with the electromagnetic clutch 21 at the power input end of the hydraulic transmission unit, the other end of the rotating speed and torque sensor 19 at the input end of the hydraulic transmission unit is connected with an input shaft of a tested hydraulic transmission unit 17, an output shaft of the tested hydraulic transmission unit 17 is connected with one end of a rotating speed and torque sensor 16 at the output end of the hydraulic transmission unit, the other end of the rotating speed and torque sensor 16 at the output end of the hydraulic transmission unit is connected with a hydraulic transmission; the output end of a DC motor speed-regulating controller 25 at the power input end of the hydraulic transmission unit of the electric control connection part is electrically controlled and connected with a DC motor 24 at the power input end of the hydraulic transmission unit, the input end 25 of the speed regulation controller of the direct current motor at the power input end of the hydraulic transmission unit is electrically controlled and connected with the output end of a D/A module 1 of a PLC (programmable logic controller), the input end of the D/A module 1 of the PLC at the input end is electrically controlled and connected with a Programmable Logic Controller (PLC)2, the electromagnetic clutch 21 at the power input end of the hydraulic transmission unit is connected with the Programmable Logic Controller (PLC)2, the rotating speed and torque sensor 19 at the input end of the hydraulic transmission unit, the pressure sensor 9, the flow sensor 8 and the rotating speed and torque sensor 16 at the output end of the hydraulic transmission unit are connected with a signal acquisition unit 7, and the speed regulation;
the mechanical transmission unit power input end alternating current variable frequency motor 22 is connected with one end of the electromagnetic clutch 20 at the mechanical transmission unit power input end through a coupler, and the other end of the electromagnetic clutch 20 at the mechanical transmission unit power input end is connected with a mechanical transmission unit coupling shaft of the confluence mechanism 15 through a coupler; the electrical control connection part is electrically connected with an alternating current variable frequency motor frequency converter 26 at the power input end of the mechanical transmission unit and an alternating current variable frequency motor 22 at the input end, the input end of the alternating current variable frequency motor frequency converter 26 and an electromagnetic clutch 20 at the power input end of the mechanical transmission unit are electrically connected with the output end of a D/A module 1 of the input end PLC in a control mode, and a rotating speed and torque sensor 18 of the mechanical transmission unit is connected with a signal acquisition unit 7.
As shown in fig. 2, the confluence mechanism 15 includes three shafts, i.e., a hydraulic transmission unit coupling shaft 151, a mechanical transmission unit coupling shaft 164 and a confluence mechanism output shaft 160, the inside of the three shafts is formed with a gear a152 and a gear B162 to form a fixed gear transmission, a planetary gear train is composed of a planetary gear train sun gear 161, a planetary gear train ring gear 155, a planetary gear train planetary gear 156 and a planetary gear train planet carrier 159, and an executing element of the governor controller is as follows: clutch L1153, clutch L2154, clutch L3157 and clutch L4158. The joint of different clutches of the confluence mechanism can realize different confluence modes of hydraulic power flow and mechanical power flow, thereby realizing the performance test of the hydraulic transmission unit of the hydraulic mechanical composite transmission system under the full-working-condition coverage.
The industrial control computer 6 is also respectively connected with an alarm 5, a display 4 and a test bed working state indicator lamp 3. The test bed working state indicator lamp 3 comprises red, green and yellow lamps. The indicating contents of the lamps with different colors are as follows: the green light is set for indicating when the vehicle normally works, the yellow light is set for indicating when the vehicle is normally stopped, and the red light is set for indicating and alarming with sound when the vehicle is abnormally stopped.
Example 2:
as shown in fig. 3, a working method of an electrical loading multifunctional test bed for a power split hydraulic mechanical compound transmission system utilizes the test bed provided by the technical scheme of embodiment 1, and the specific operation process is as follows:
the operating mode of the four clutch engagement states in the confluence mechanism 15 is controlled by the speed-regulating controller 11:
(1) forward confluence power transfer mode for hydraulic transmission unit
When the clutch L2153 and the clutch L4157 are engaged, the mechanical transmission unit coupling shaft 164 is connected to the planetary gear train ring gear 155, the hydraulic transmission unit coupling shaft 151 is always connected to the planetary gear train sun gear 161 through the fixed gear transmission formed by the gear a152 and the gear B162, and the confluence mechanism output shaft 160 is connected to the planetary gear train carrier 159, at which time the rotation speed of the confluence mechanism output shaft 160 is increased with an increase in the rotation speed of the hydraulic transmission unit coupling shaft 151, constituting a forward confluence transmission in which the output rotation speed is increased with an increase in the output rotation speed of the hydraulic transmission unit hydraulic motor.
(2) Reverse confluence power transfer mode of hydraulic transmission unit
When the clutch L1154 and the clutch L3158 are engaged, the mechanical transmission unit coupling shaft 164 is connected to the planetary carrier 159, the hydraulic transmission unit coupling shaft 151 is always connected to the planetary carrier sun gear 161 through the fixed gear transmission formed by the gear a152 and the gear B162, and the confluence mechanism output shaft 160 is connected to the planetary carrier ring gear 155, at which time the rotation speed of the confluence mechanism output shaft 160 is reduced with an increase in the rotation speed of the hydraulic transmission unit coupling shaft 151, constituting a reverse confluence transmission in which the output rotation speed is reduced with an increase in the output rotation speed of the hydraulic transmission unit hydraulic motor.
(3) Hydraulic drive unit single transfer power mode
When the clutch L1154 and the clutch L2153 are engaged, the transmission ratio of the planetary gear train is 1, the mechanical transmission unit coupling shaft 164 does not transmit power, and the power input of the hydraulic transmission unit coupling shaft 151 and the power output of the confluence mechanism output shaft 160 are realized.
The power input end hydraulic transmission part selects a hydraulic transmission unit power input end direct current motor 24 as a power source, the mechanical transmission part selects a mechanical transmission unit power input end alternating current variable frequency motor 22 as a power source, the speed ratio of the hydraulic transmission and the mechanical transmission input ends can be adjusted at will, automatic calibration and comparison of the speed ratio are realized through the adjustment of the speed ratio, the performance test and the optimal proportion distribution range of the hydraulic transmission unit of the whole compound transmission system are determined and met through the test, meanwhile, a control program is compiled according to the universal characteristic curve of the selected and matched engine, the power characteristics of the engine can be simulated through a two-stage control mode of an industrial control computer 6 and a Programmable Logic Controller (PLC)2 to provide the power source for a test bench, the test working condition of the tested hydraulic transmission unit is closest to the actual use working condition, the test testing capability of the transmission system, Expanding the requirement of the test range; according to the transmission characteristic of the hydraulic mechanical composite transmission system, the hydraulic transmission unit has the phenomenon of power flow back flow circulation, so that the hydraulic transmission part adopts the direct current motor as a power source, the direct current motor can realize the power generation function after the power flow back flow occurs, and the generated electric energy is fed back to the power supply, thereby having the characteristic of energy conservation; the exhaust emission of the engine is avoided under the condition of testing by an indoor test bed, and the device has the characteristic of environmental protection.
The power output end load simulation device adopts an output end loading direct current motor 13 for simulating the load resistance of the working road condition of the vehicle, and a direct current motor loading system formed by an industrial control computer 6 and a Programmable Logic Controller (PLC)2 has two running states, namely a power generation state and an electric state, feeds generated electric energy back to a power supply and also has the characteristic of energy conservation. Meanwhile, the control system adopts a two-stage control mode of an industrial control computer and a Programmable Logic Controller (PLC) to simulate the change of the power of a power demand field in the vehicle power transmission system, thereby improving the test capability of the transmission system and expanding the requirement of the application range.
Under the two-stage control of the industrial control computer 6 and the Programmable Logic Controller (PLC)2, the direct current motor and the alternating current motor can realize different working modes:
(1) constant torque mode. Under the regulation control of a control system and a control program, the motor in the mode is compared and regulated according to the feedback of an actually measured value of the torque and a set value, and the output torque of the motor is automatically adjusted according to a set control mode through a frequency converter and a controller so as to be maintained at the set value.
(2) Constant speed mode. Under the regulation control of a control system and a control program, the motor in the mode is compared and regulated according to the feedback of an actual measurement value of the rotating speed and a set value, and the output rotating speed of the motor is automatically regulated according to a set control mode through a frequency converter and a controller so as to be maintained at the set value.
(3) Constant power mode. The motor maintains the output power of the motor at a given value under the regulation control of a control system and a control program.
The motors of the input end hydraulic transmission unit and the mechanical transmission unit are set in a constant rotating speed mode, and the output end loading motor simulates the actual working condition and sets three working modes of constant torque, constant rotating speed and constant power; the confluence mechanism sets a forward confluence power transmission mode of the hydraulic transmission unit according to experimental requirements to realize performance test when testing the forward confluence power transmission of the hydraulic transmission unit; the confluence mechanism hydraulic transmission unit reverse confluence transmission power mode realizes the performance test when testing the reverse confluence transmission power of the hydraulic transmission unit; when the confluence mechanism is arranged to be mutually switched from the two working modes, the performance test of the hydraulic transmission unit of the multi-section hydraulic mechanical composite transmission system can be tested. When the confluence mechanism is provided with a single power transmission mode of the hydraulic transmission unit, the performance test of a pure hydraulic transmission system can be realized.
The working state indicator lamp of the test bed is set to be red, green and yellow. The indication content is as follows: the green light is set for indicating when the vehicle normally works, the yellow light is set for indicating when the vehicle is normally stopped, and the red light is set for indicating and alarming with sound when the vehicle is abnormally stopped. The equipment alarms by adopting the indication lamp and simultaneously the characters and sound indication displayed by the equipment computer until the alarm release button is pressed.
Dynamic loading can be realized through a control program, and the actual working condition and the specified circulating working condition of the hydraulic mechanical composite transmission system are simulated; the control system and the control program can set different set values for the rotating speed and the torque of the input end motor and the output end motor according to different test schemes, and can completely meet the performance test of a hydraulic transmission unit of the hydraulic mechanical composite power transmission system and the proportion test of mechanical transmission power flow and hydraulic transmission power flow of the whole transmission system by adopting a closed-loop control mode; in the test process, according to actual requirements, an operator debugs a control program and presses a start button, so that the control and performance test of the whole process can be realized; the individual measured values and the analysis results in the test can be displayed, processed, stored and printed in real time by means of an industrial control computer and a display. Compared with the traditional test bed, the test bed can be used for simply, conveniently and reliably testing the performance of the hydraulic transmission unit of the hydraulic mechanical composite transmission system, and a large amount of test time and cost are saved.
The structure and operation of the present invention are described in the embodiments, the present invention is not limited to the embodiments, and any modifications, substitutions and improvements made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (4)

1. The utility model provides a power split hydraulic pressure machinery compound transmission system electricity loading multifunctional test bench, includes mechanical part and control section, its characterized in that:
the mechanical part includes:
the hydraulic transmission unit comprises a hydraulic transmission unit power input end direct current motor, a hydraulic transmission unit power input end electromagnetic clutch, a hydraulic transmission unit input end rotating speed and torque sensor, a hydraulic transmission unit to be tested and a hydraulic transmission unit output end rotating speed and torque sensor, wherein the input ends of the direct current motor, the electromagnetic clutch and the hydraulic transmission unit power input end are sequentially connected;
the input end of the mechanical transmission unit is sequentially connected with an alternating current variable frequency motor, an electromagnetic clutch and a rotating speed and torque sensor;
the rotating speed and torque sensor at the output end of the hydraulic transmission unit and the rotating speed and torque sensor of the mechanical transmission unit are in transmission connection with an input shaft of the confluence mechanism respectively; an output shaft of the confluence mechanism is sequentially connected with an output end rotating speed torque sensor and an output end direct current motor in a transmission way;
the control section includes:
the industrial control computer, the signal acquisition unit and the programmable controller are respectively connected with the industrial control computer;
the signal acquisition unit is connected with the tested hydraulic transmission unit through the pressure sensor and the flow sensor; the signal acquisition unit is also respectively connected with a rotating speed and torque sensor at the input end of the hydraulic transmission unit, a rotating speed and torque sensor at the output end of the hydraulic transmission unit, a rotating speed and torque sensor at the mechanical transmission unit and a rotating speed and torque sensor at the output end;
the programmable controller is respectively connected with a D/A module of the input end PLC, a D/A module of the output end PLC, a power input end electromagnetic clutch of the hydraulic transmission unit, a power input end electromagnetic clutch of the mechanical transmission unit and a speed regulation controller; the D/A module of the input end PLC is respectively connected with the direct current motor at the power input end of the hydraulic transmission unit and the alternating current variable frequency motor at the power input end of the mechanical transmission unit through a direct current motor speed regulation controller at the power input end of the hydraulic transmission unit and an alternating current variable frequency motor frequency converter at the power input end of the mechanical transmission unit; the D/A module of the output end PLC is connected with the output end DC motor through an output end DC motor speed regulation controller; the speed regulation controller is respectively connected with the confluence mechanism and the tested hydraulic transmission unit;
the direct current motor at the power input end of the hydraulic transmission unit is connected with one end of the electromagnetic clutch at the power input end of the hydraulic transmission unit through a coupler, and the rotating speed and torque sensor at the output end of the hydraulic transmission unit is in transmission connection with a hydraulic transmission unit coupling shaft of the confluence mechanism;
the alternating-current variable-frequency motor at the power input end of the mechanical transmission unit is connected with one end of the electromagnetic clutch at the power input end of the mechanical transmission unit through a coupler, and the other end of the electromagnetic clutch at the power input end of the mechanical transmission unit is in transmission connection with a mechanical transmission unit coupling shaft of the confluence mechanism through the coupler;
the confluence mechanism comprises a planetary gear train consisting of a planetary gear train gear ring, a planetary gear train planet wheel and a planetary gear train planet carrier, a fixed gear transmission formed by a gear A and a gear B, a clutch L1, a clutch L2, a clutch L3, a clutch L4 and an executing element of a speed regulation controller; the confluence mechanism extends outwards to form a hydraulic transmission unit connecting shaft, a mechanical transmission unit connecting shaft and a confluence mechanism output shaft;
the direct current motor at the power input end of the hydraulic transmission unit, the alternating current variable frequency motor at the power input end of the mechanical transmission unit and the direct current motor at the output end of the mechanical transmission unit are all connected with a power supply.
2. The power-split hydromechanical compound transmission system electrical loading multifunctional test bench of claim 1, wherein the industrial control computer is further connected with an alarm, a display and a bench working state indicator lamp respectively.
3. The multifunctional test bench for electrical loading of power-split hydromechanical compound transmission system according to claim 2, wherein the bench operating status indicator lights include red, green and yellow lights.
4. A method of operating a power split hydromechanical compound transmission system electrical loading multifunctional test rig as claimed in any of claims 1 to 3, comprising the steps of:
the working mode of the engaging states of four clutches in the confluence mechanism is controlled by a speed regulation controller:
(1) forward confluence power transfer mode for hydraulic transmission unit
When the clutch L2 and the clutch L4 are engaged, the coupling shaft of the mechanical transmission unit is connected with the planetary gear train gear ring, the coupling shaft of the hydraulic transmission unit is always connected with the sun gear of the planetary gear train through the fixed gear transmission formed by the gear A and the gear B, the output shaft of the confluence mechanism is connected with the planetary gear train planet carrier, and the rotating speed of the output shaft of the confluence mechanism is increased along with the increase of the rotating speed of the coupling shaft of the hydraulic transmission unit, so that the forward confluence transmission with the increase of the output rotating speed of the direct current motor at the power input end of the hydraulic transmission unit is formed;
(2) reverse confluence power transfer mode of hydraulic transmission unit
When the clutch L1 and the clutch L3 are engaged, the connecting shaft of the mechanical transmission unit is connected with the planet carrier of the planetary gear train, the connecting shaft of the hydraulic transmission unit is always connected with the sun gear of the planetary gear train through the fixed gear transmission formed by the gear A and the gear B, the output shaft of the confluence mechanism is connected with the gear ring of the planetary gear train, and the rotating speed of the output shaft of the confluence mechanism is reduced along with the increase of the rotating speed of the connecting shaft of the hydraulic transmission unit, so that the reverse confluence transmission with the reduction of the output rotating speed along with the increase of the output rotating speed of the direct current motor at the power;
(3) hydraulic drive unit single transfer power mode
When the clutch L1 and the clutch L2 are engaged, the transmission ratio of the planetary gear train is 1, the coupling shaft of the mechanical transmission unit does not transmit power, the power of the coupling shaft of the hydraulic transmission unit is input, and the power of the output shaft of the confluence mechanism is output;
and under the two-stage control of the industrial control computer and the programmable controller, the DC motor at the power input end of the hydraulic transmission unit and the AC variable frequency motor at the power input end of the mechanical transmission unit are set in a constant rotating speed mode, and the DC motor at the output end is set in three working modes of constant torque, constant rotating speed and constant power by simulating the actual working condition, wherein,
(1) constant torque mode: under the regulation control of a control system and a control program, the motor in the mode is compared and regulated according to the feedback of an actual measured value of the torque and a given value, and the output torque of the motor is changed and maintained at the set value through the automatic regulation of a frequency converter and a controller according to a given control mode;
(2) constant rotation speed mode: under the regulation control of a control system and a control program, the motor in the mode is compared and regulated according to the feedback of an actual measurement value of the rotating speed and a given value, and the output rotating speed of the motor is automatically regulated in a given control mode through a frequency converter and a controller to be maintained at the set value;
(3) constant power mode: the motor maintains the output power of the motor at a given value under the regulation control of a control system and a control program.
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