WO2021026946A1 - Multifunctional test bench for power split hydraulic mechanical composite transmission system, and application thereof - Google Patents

Abstract

A multifunctional test bench for a power split hydraulic mechanical composite transmission system, comprising a platform (19) and a control system. An alternating current servomotor (1), a flow splitting mechanism (2), a hydraulic transmission unit (3) to be tested, a flow combination mechanism (4), and a hydraulic loading system (5) are provided on the platform (19); the control system comprises an industrial control computer (33), a PLC (32), an input end PLC D/A module (31), an output end PLC D/A module (39), a signal acquisition unit (36), a pressure sensor (42), a flow sensor (41), a speed regulation controller (38), a loading system controller (40), and a servomotor controller (30). Performance test of a hydraulic mechanical composite transmission system can be simply and reliably carried out, test time and costs can be greatly reduced, and performance test of the hydraulic transmission unit (3) to be tested, the ratio test of mechanical and hydraulic power flows, and the stage switching stability test are implemented.

Description

Multifunctional test bench for power split type hydraulic-mechanical compound transmission system and its application Technical field

The invention relates to a power split type hydraulic-mechanical composite transmission system multifunctional test bench and its application, which is suitable for dynamic performance testing of the power split type hydraulic-mechanical composite transmission system and hydraulic transmission unit, and the mechanical and hydraulic power flow of the transmission system The test of the proportion and the test of the stability performance of the changeover belong to the technical field of construction machinery and agricultural machinery.

Background technique

Construction machinery, tractors, etc. have large transmission power, wide range of speed changes, and complex operating conditions. With the development of social economy and technology, requirements for power, fuel economy, ground adaptability, productivity, and operation automation are getting higher and higher. Therefore, the performance of the engine cannot be fully utilized. Energy saving and emission reduction has become a global theme today. The variable speed transmission system of vehicles plays a core role in improving vehicle performance. Hydro-mechanical continuously variable transmission is a type of power split hydraulic machinery that transmits power by a combination of hydraulic power flow and mechanical power flow. The compound transmission form can realize high-efficiency and high-power power transmission through mechanical transmission, and realize stepless speed change through hydraulic transmission, which shows good application prospects on high-power vehicles. The hydraulic-mechanical continuously variable transmission combines the advantages of the good stepless speed regulation performance of the hydrostatic transmission and the higher steady-state efficiency of the mechanical transmission, so as to obtain a stepless transmission performance with higher efficiency and The distribution of the high efficiency zone is advantageous for the variable speed transmission. Therefore, the design and development of high-performance hydraulic-mechanical continuously variable transmission is the key to the research and application of high-power vehicle technology for the hydraulic-mechanical composite transmission system.

The hydraulic-mechanical continuously variable transmission is composed of a mechanical transmission unit, a pump-motor hydraulic continuously variable transmission unit, a planetary gear mechanism that divides or converges power, an automatic transmission electronic control device and a drive system. When the transmission ratio of the mechanical transmission mechanism is determined, adjusting the transmission ratio of the hydraulic continuously variable transmission unit can make the transmission ratio of the hydraulic-mechanical composite transmission system achieve stepless change within a certain range, so that the power can be split, continuously variable and merged. Output, realize high-power and high-efficiency continuously variable transmission, so this power split hydraulic-mechanical composite transmission system combines the high transmission efficiency of a pure mechanical transmission system and the advantages of a pure hydraulic transmission system. At present, the design and development of hydraulic mechanical continuously variable transmissions and performance tests are carried out in the prototype of the product, and then tested on a special test bench or device, and through a series of test tests, the hydraulic transmission unit and machinery of the prototype product are trial-produced. Transmission units are often not the best design matching scheme, and there may even be re-trial products, resulting in a relatively high cost of product design and development and a relatively long cycle, which consumes a lot of manpower and material resources. Although the current development of computer simulation and virtual prototype technology has greatly shortened the design cycle and cost of products, the inconsistency of simulation conditions and real working conditions can also lead to uncertainty in product development.

The comprehensive performance of the hydraulic-mechanical composite transmission system is determined by the respective performances of hydraulic and mechanical power flows and their joint effects. 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 to the mechanical transmission , The hydraulic pumps, hydraulic motors, control valve groups and connecting pipes that make up the hydrostatic transmission unit have efficiency problems in the entire system unit, and the volumetric efficiency and mechanical efficiency of the pumps and motors that affect the overall transmission efficiency of the unit vary with speed. The transmission efficiency is unstable. Therefore, on the premise of maintaining the continuously variable transmission capability of the hydraulic transmission unit, increasing its efficiency peak and expanding the high efficiency area under common working conditions is to ensure the transmission efficiency and performance of the hydraulic-mechanical composite transmission system.

Summary of the invention

In view of the shortcomings of the prior art, the present invention provides a power split type hydraulic-mechanical composite transmission system multifunctional test bench, which can realize the performance test of the hydraulic-mechanical composite transmission system hydraulic transmission unit and the proportional test of mechanical and hydraulic power flow And the smooth performance test of the shift, and finally realize the optimal combination distribution scheme of mechanical and hydraulic power flow.

The invention also provides a working method of the above-mentioned power split type hydraulic-mechanical composite transmission system multifunctional test test bench.

The technical scheme of the present invention is as follows:

A power split type hydraulic-mechanical composite transmission system multifunctional test test bench, including a platform and a control system;

The platform is equipped with an AC servo motor, a shunt mechanism, a tested hydraulic drive unit, a confluence mechanism, and a hydraulic loading system;

The output shaft of the AC servo motor is connected to one end of the input shaft of the shunt mechanism through the first coupling, the input speed torsion sensor, and the second coupling in turn; the output shaft of the shunt mechanism passes through the eighth coupling and the rotational speed of the mechanical transmission unit in turn The torque sensor and the seventh coupling are connected to an input end of the confluence mechanism; the output end of the confluence mechanism is connected to the hydraulic loading system through the fifth coupling, the output speed torque sensor, and the sixth coupling in turn; the tested hydraulic transmission The input shaft of the unit is connected to the other end of the input shaft of the shunt mechanism through the ninth coupling, the speed torque sensor at the input end of the hydraulic transmission unit, and the tenth coupling. The output shaft of the tested hydraulic transmission unit sequentially passes through the third coupling The output end of the hydraulic transmission unit, the speed torque sensor, and the fourth coupling are connected to the other input end of the confluence mechanism;

The control system includes industrial control computer, PLC, input PLC D/A module, output PLC D/A module, signal acquisition unit, pressure sensor, flow sensor, speed controller, loading system controller, servo motor control Device

The pressure sensor and the flow sensor are installed on the tested hydraulic transmission unit. The industrial control computer connects the input speed torque sensor through the signal acquisition unit, the output speed torque sensor of the hydraulic transmission unit, the output speed torque sensor, and the input speed of the hydraulic transmission unit. Torque sensor, flow sensor, pressure sensor, mechanical transmission unit speed torque sensor; AC servo motor is connected to PLC through the servo motor controller and the D/A module of the input end PLC in turn, the tested hydraulic transmission unit and confluence mechanism are respectively connected to speed regulation The controller and the speed control controller are then connected to the PLC, the hydraulic loading system is connected to the PLC through the loading system controller and the D/A module of the output PLC in turn, and the PLC is connected to the industrial control computer.

Preferably, the AC servo motor is fixed on the platform by T-bolts.

Preferably, the input speed and torque sensor, the input speed and torque sensor of the hydraulic transmission unit, the speed and torque sensor of the mechanical transmission unit, the output speed and torque sensor of the hydraulic transmission unit, and the output speed and torque sensor respectively pass through the fifth sensor bracket and the fourth sensor bracket. The sensor bracket, the third sensor bracket, the first sensor bracket, and the second sensor bracket are fixedly installed on the platform.

Preferably, the shunt mechanism includes a box body, an input shaft and an output shaft. Two ends of the input shaft extend out on both sides of the box body, and the output shaft extends out of one side of the box body; inside the box body, the first gear is installed through clutch A On the input shaft, the second gear is mounted on the input shaft through the clutch B, the eleventh gear is mounted on the reversing shaft, the tenth gear and the ninth gear are mounted on the intermediate shaft, the third gear, the fourth gear and the The five-gear triple sliding gear is installed on the intermediate shaft through a spline shaft, and the sixth gear, the seventh gear and the eighth gear are installed on the output shaft. The advantage of this design is that the engagement of different clutches of the shunt mechanism can realize different shunting modes of hydraulic power flow and mechanical power flow, thereby realizing the performance test of different configuration schemes of the hydraulic transmission unit of the hydraulic-mechanical composite transmission system.

Preferably, the confluence mechanism includes a box body, an input shaft I, an input shaft II, and an output shaft. The input shaft I and the input shaft II extend from one side of the box, and the output shaft extends from the other side of the box; inside the box , The fifteenth gear is installed on the input shaft Ⅱ through the clutch D, the fourteenth gear is installed on the input shaft Ⅱ through the clutch C, the planetary gear train I and the sun gear of the planetary gear train II are installed on the input shaft Ⅰ, The second gear is connected with the planet carrier of the planetary gear train I, the thirteenth gear is connected with the ring gear of the planetary gear train II, the ring gear of the planetary gear train I is connected with the planet carrier of the planetary gear train II, the planet carrier of the planetary gear train II is connected It is connected with the output shaft; the fifteenth gear and the twelfth gear constitute a fixed shaft gear pair, and the thirteenth gear and the fourteenth gear constitute a fixed shaft gear pair. The advantage of this design is that the joining of different clutches of the confluence mechanism can realize different confluence modes of hydraulic power flow and mechanical power flow, so as to realize the performance test of different configuration schemes of the hydraulic transmission unit of the hydraulic-mechanical composite transmission system.

Preferably, the hydraulic loading system includes a loading hydraulic pump, a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve, a charge pump, a motor, a first filter, and a second filter. Filter, third filter, ordinary overflow valve, electromagnetic overflow valve and fuel tank; the first one-way valve, the second one-way valve, the third one-way valve, and the fourth one-way valve are connected to form a regulating valve group, which is loaded with hydraulic pressure The pump is a bidirectional hydraulic pump with inclined axis. The upper and lower ends of the loading hydraulic pump, the electromagnetic overflow valve, and the charge pump are respectively connected to the regulating valve group through four oil lines, and the oil line between the charge pump and the regulating valve group is connected to an ordinary relief valve , The electromagnetic overflow valve, the ordinary overflow valve, and the charge pump are connected to the oil tank through the second filter, the third filter, and the first filter. The charge pump is driven by the motor, and the electromagnetic overflow valve is connected and controlled by the loading system controller. The advantage of this design is that the inclined axis two-way hydraulic pump can realize bidirectional load application, and the electromagnetic relief valve can dynamically adjust the pressure of the system through the loading system controller to realize the dynamic change of the load and realize the simulation of the actual load. , The role of the ordinary relief valve is to adjust the charge pressure.

Preferably, the transmission shaft of the loading hydraulic pump is connected to the sixth coupling through the loading hydraulic pump mounting seat, and the input shaft of the tested hydraulic transmission unit is connected to the ninth coupling through the variable hydraulic pump mounting seat, and is tested The output shaft of the hydraulic transmission unit is connected to the third coupling through the hydraulic motor mount.

Preferably, the loading hydraulic pump mounting seat, the variable hydraulic pump mounting seat, and the hydraulic motor mounting seat are all provided with an oil receiving groove, and the bottom of the oil receiving groove is fixed on the platform by a T-bolt.

Preferably, the industrial control computer is also connected with a working status indicator, a display, and an alarm, and the working status indicator includes red, yellow, and green lights. The advantage of this design is that the three color lights represent different working states, the display shows the working state and parameters, and the abnormal situation is alarmed by the alarm.

A working method of a power split type hydraulic-mechanical composite transmission system multifunctional test test bench, including the following steps:

Under the two-level control of industrial control computer and PLC, the AC servo motor is used to simulate the actual working mode of the engine through the servo motor controller, and the hydraulic loading system is set to work with constant torque, constant speed and constant power through the loading system controller. Mode to simulate actual load conditions;

By adjusting the engagement of different clutches of the splitter mechanism, different splitting modes of hydraulic power flow and mechanical power flow are realized, so as to realize the performance test of different configuration schemes of the tested hydraulic transmission unit;

Through the speed controller to control the engagement state of the two clutches in the confluence mechanism, three different power transmission modes of the tested hydraulic transmission unit are forward confluence transmission power, reverse confluence transmission power, and single transmission power;

Finally, under the combination of different working modes of the AC servo motor, different working modes of the hydraulic loading system, different shunting modes of the shunt mechanism, and different power transmission modes of the confluence mechanism, the performance test of the tested hydraulic transmission unit is realized. Ratio test of mechanical and hydraulic power flow and smooth performance test of changing section.

The beneficial effects of the present invention are:

1) The present invention is a power split type hydraulic-mechanical composite transmission system multifunctional test bench, which can realize the performance test of the hydraulic-mechanical composite transmission system hydraulic transmission unit, and test the hydraulic-mechanical composite by simulating the actual driving conditions and operating conditions of the application vehicle The transmission performance of the hydraulic transmission unit of the transmission system, and can realize the performance test of one-stage and multi-stage hydraulic-mechanical compound transmission hydraulic transmission unit, the proportion test of the mechanical and hydraulic power flow of the compound transmission system, the performance of the section and the best timing of section change The test, according to the universal characteristic curve of the matched engine, finally realizes the optimal combination distribution scheme of mechanical and hydraulic power flow, and provides power performance optimization for vehicles that use the hydraulic-mechanical composite transmission system in the future.

2) The test bench of the present invention can also provide a test platform for the performance test of the performance test test plan of the hydrostatic transmission system. The test bench of the present invention adopts closed-loop speed control, the test test speed has good stability, and the test conditions can simulate actual working conditions. , The test bench has reasonable structure design, compact layout, modular installation, simple operation, safe and reliable operation, and cost saving.

Description of the drawings

Figure 1 is a schematic diagram of the structure of a multifunctional test bench for a power split hydraulic-mechanical composite transmission system of the present invention;

Figure 2 is a schematic diagram of the structure of the test bench of the present invention;

Figure 3 is a schematic diagram of the transmission structure of the shunt mechanism of the present invention;

4 is a schematic diagram of the transmission structure of the confluence mechanism of the present invention;

Figure 5 is a schematic diagram of the hydraulic loading system of the present invention;

Figure 6 is a space layout diagram of the test bench of the present invention;

Fig. 7 is a control flow chart of the multifunctional test bench of the power split type hydraulic-mechanical compound transmission system of the present invention;

Among them: 1- AC servo motor; 2- shunt mechanism; 3- hydraulic transmission unit to be tested; 4- confluence mechanism; 5- hydraulic loading system; 6- hydraulic motor mounting seat; 7- first coupling; 8- Input speed and torque sensor; 9-second coupling; 10-third coupling; 11-speed and torque sensor at output of hydraulic transmission unit; 12-first sensor bracket; 13-fourth coupling; 14- Fifth coupling; 15-output speed torque sensor; 16-second sensor bracket; 17-sixth coupling; 18-loading hydraulic pump mounting seat; 19-platform; 20-variable hydraulic pump mounting seat; 21 -Seventh coupling; 22- third sensor bracket; 23- ninth coupling; 24- mechanical transmission unit speed and torque sensor; 25- fourth sensor support; 26- hydraulic transmission unit input speed and torque sensor; 27 -The tenth coupling; 28-the eighth coupling; 29-the fifth sensor bracket; 30-servo motor controller; 31-the D/A module of the PLC at the input end; 32-PLC (programmable controller) ; 33-Industrial control computer; 34-Working status indicator; 35-Display; 36-Signal acquisition unit; 37-Alarm; 38-Speed control controller; 39-D/A module of output terminal PLC; 40-Load System controller; 41-flow sensor; 42-pressure sensor;

201-output shaft; 202-clutch A; 203-first gear; 204-clutch B; 205-second gear; 206-third gear; 207-fourth gear; 208-fifth gear; 209-intermediate shaft; 210-sixth gear; 211-input shaft; 212-seventh gear; 213-eighth gear; 214-ninth gear; 215-tenth gear; 216-eleventh gear; 217-reversing shaft;

401-input shaft Ⅰ; 402-twelfth gear; 403-planetary gear train Ⅰ; 404-planetary gear train Ⅱ; 405-brake; 406-thirteenth gear; 407-output shaft; 408-clutch C; 409- The fourteenth gear; 410-the fifteenth gear; 411-clutch D; 412-input shaft Ⅱ;

501-loading hydraulic pump; 502-first one-way valve; 503-second one-way valve; 504-third one-way valve; 505-charge pump; 506-motor; 507-first filter; 508-fuel tank; 509-second filter; 510-common overflow valve; 511-electromagnetic overflow valve; 512-fourth one-way valve; 513-third filter.

detailed description

Hereinafter, the present invention will be further described through embodiments in combination with the drawings, but it is not limited thereto.

Example 1:

As shown in Figure 1, this embodiment provides a power split type hydraulic-mechanical composite transmission system multifunctional test bench, which includes a power source AC servo motor at an input end, a rotational speed and torque sensor 8, a shunt mechanism 2, and an input end. Hydraulic transmission unit input speed torque sensor 26, tested hydraulic transmission unit 3, pressure sensor 42, flow sensor 41, hydraulic transmission unit output speed torque sensor 11, mechanical transmission unit speed torque sensor 24, confluence mechanism 4, output Speed torque sensor 15, hydraulic loading system 5, loading system controller 40, output PLC D/A module 39, speed control controller 38, signal acquisition unit 36, alarm 37, display 35, working status indicator 34, The industrial control computer 33, the PLC 32, the D/A module 31 of the input terminal PLC, and the servo motor controller 30. The connection relationship of the above components is shown in Figure 1. The solid line is the mechanical connection, and the dashed line is the control line connection.

As shown in Fig. 6, the platform 19 is a rectangular cast iron base with multiple grooves for fixing with T-bolts. The AC servo motor 1 is fixed on the platform 19 by T-bolts. The output shaft of the motor is connected to one end of the first coupling 7, and the other end of the first coupling is connected to the input speed and torque sensor 8. The input speed and torque sensor 8 passes through The fifth sensor bracket 29 is fixed on the platform 19, the other end of the input speed torque sensor 8 is connected with one end of the second coupling 9, and the other end of the second coupling is extended with the left end of the input shaft 211 of the shunt mechanism. Part, the right end of the input shaft 211 is connected to one end of the tenth coupling 27, the other end of the tenth coupling 27 is connected to the hydraulic transmission unit input speed torque sensor 26, and the hydraulic transmission unit input speed torque sensor 26 The fourth sensor bracket 25 is fixed on the platform 19, the other end of the rotational speed torque sensor 26 at the input end of the hydraulic transmission unit is connected with one end of the ninth coupling 23, and the other end of the ninth coupling 23 is connected through the variable hydraulic pump mounting seat 20 is connected with the input shaft of the hydraulic transmission unit, the variable hydraulic pump mounting seat 20 is fixed on the platform 19 by T-bolts, the output shaft 201 of the splitter mechanism is connected with one end of the eighth coupling 28, the eighth coupling The other end of the mechanical transmission unit 28 is connected to the mechanical transmission unit rotational speed and torque sensor 24. The mechanical transmission unit rotational speed and torque sensor 24 is fixed on the platform 19 through the third sensor bracket 22. The other end of the mechanical transmission unit rotational speed and torque sensor 24 is connected with the seventh coupling One end of 21 is connected, the other end of the seventh coupling 21 is connected with the extension part of the input shaft II 412, the extension part of the input shaft I 401 of the confluence mechanism is connected with one end of the fourth coupling 13, and the other end of the fourth coupling 13 One end is connected with the rotational speed and torque sensor 11 at the output of the hydraulic transmission unit, the rotational speed and torque sensor 11 at the output of the hydraulic transmission unit is fixed on the platform 19 through the first sensor bracket 12, and the other end is connected with the third coupling One end of the connector 10 is connected, and the other end of the third coupling 10 is connected to the output shaft of the hydraulic transmission unit through the hydraulic motor mounting seat 6. The hydraulic motor mounting seat 6 is fixed on the platform 19 by T-bolts, the shunt mechanism 2 and the confluence The mechanism 4 is fixed on the platform 19 by T-bolts. The extension part of the output shaft 407 of the confluence mechanism 4 is connected to one end of the fifth coupling 14, and the other end of the fifth coupling 14 is connected to the output speed torque sensor 15. The output speed torque sensor 15 is fixed on the platform 19 through the second sensor bracket 16. The output speed torque sensor 15 is connected to one end of the sixth coupling 17, and the other end of the sixth coupling 17 is loaded by the hydraulic pump mounting seat 18. It is connected with the input shaft of the hydraulic loading pump 501; the loading hydraulic pump mounting seat 18, the variable hydraulic pump mounting seat 20, and the hydraulic motor mounting seat 16 are all provided with an oil receiving groove, and the bottom of the oil receiving groove is fixed on the platform by a T-bolt. The grooved form is mainly for the recovery of hydraulic oil leakage when loading and unloading hydraulic components.

The pressure sensor 42 and the flow sensor 41 are installed on the tested hydraulic transmission unit 3. The industrial control computer 33 is connected to the input speed torque sensor 8, the output speed torque sensor 11 of the hydraulic transmission unit, and the output speed torque sensor through the signal acquisition unit 36 15. The input speed and torque sensor 26 of the hydraulic transmission unit, the flow sensor 41, the pressure sensor 42, the speed and torque sensor 24 of the mechanical transmission unit; the AC servo motor 1 is connected through the servo motor controller 30 and the D/A module 31 of the input PLC in turn PLC32, the tested hydraulic transmission unit 3 and the confluence mechanism 4 are respectively connected to the speed controller 38, and the speed controller 38 is then connected to the PLC32. The hydraulic loading system 5 in turn passes through the loading system controller 40 and the D/A module of the output terminal PLC 39 is connected to PLC32, and PLC32 is connected to industrial control computer 33. The working status indicator 34, the display 35, and the alarm 37 are respectively connected to the industrial control computer 33, and the working status indicator 34 includes red, yellow, and green lights. The three color lights represent different working states, the display 35 shows the working state and parameters, and the alarm 37 gives an alarm for abnormal situations.

As shown in Figure 2, the test bench adopts modular design and assembly, which is divided into power source module AC servo motor 1, shunt mechanism 2 module, hydraulic drive unit 3 module, confluence mechanism 4 module, hydraulic loading system 5 module; The modular design facilitates the assembly and disassembly of the test bench.

As shown in Figure 3, the shunt mechanism 2 includes a box, an input shaft 211 and an output shaft 201. The input shaft 211 of the shunt mechanism extends out on both sides of the box. One end is connected to the AC servo motor 1 as the input end of the power source, and the other end is connected to the AC servo motor 1. The input end of the tested hydraulic transmission unit 3; the output shaft 201 is connected to the mechanical transmission unit, and the inside of the box is mounted on the output shaft 201 by the first gear 203 through the clutch A202, and the second gear 205 is mounted on the output shaft 201 through the clutch B204; The eleven gear 216 is installed on the reversing shaft 217; the tenth gear 215, the ninth gear 214 are installed on the intermediate shaft 209, the third gear 206, the fourth gear 207 and the fifth gear 208 form a triple sliding gear through splines The shaft is mounted on the intermediate shaft 209; the sixth gear 210, the seventh gear 212 and the eighth gear 213 are mounted on the input shaft 211.

As shown in Figure 4, the confluence mechanism 4 includes a box, an input shaft I401, an input shaft II412, and an output shaft 407. The input shaft I401 is connected to the output shaft of the tested hydraulic transmission unit 3, and the input shaft II412 is connected to the machine The transmission unit, the output shaft 407 is extended to connect with the hydraulic loading system 5; the fifteenth gear 410 in the box is installed on the input shaft II 412 through the clutch D411, and the fourteenth gear 409 is installed on the input shaft II 412 through the clutch C408. Planetary gear train The sun gear of Ⅰ403 and the planetary gear train Ⅱ404 are mounted on the input shaft 401, the twelfth gear 402 is connected with the planet carrier of the planetary gear train Ⅰ403, the thirteenth gear 406 is connected with the ring gear of the planetary gear train Ⅱ404, the planetary gear train Ⅰ403 The ring gear is connected with the planet carrier of the planetary gear train II404, and the planet carrier of the planetary gear train II404 is connected with the output shaft 407; the fifteenth gear 410 and the twelfth gear 402 constitute a fixed shaft gear pair, and the thirteenth gear 406 and the Fourteen gears 409 constitute a fixed shaft gear pair.

As shown in Figure 5, the hydraulic loading system 5 consists of a loading hydraulic pump 501, a first one-way valve 502, a second one-way valve 503, a third one-way valve 504, a charge pump 505, a motor 506, a first filter 507, Oil tank 508, second filter 509, ordinary overflow valve 510, electromagnetic overflow valve 511, fourth one-way valve 512, third filter 513; loading hydraulic pump 501 is a bidirectional hydraulic pump of inclined axis type, which can realize bidirectional Load is applied, the first one-way valve 502, the second one-way valve 503, the third one-way valve 504, and the fourth one-way valve 512 are connected to form a regulating valve group. The loading hydraulic pump 501 is an inclined axis bidirectional hydraulic pump, which can be realized Two-way load application, load the upper and lower ends of the hydraulic pump 501, the electromagnetic overflow valve 511, and the charge pump 505 respectively through four oil lines to connect the regulating valve group, and the oil line between the charge pump 505 and the regulating valve group is connected to the ordinary relief valve 510, the electromagnetic overflow valve 511, the ordinary overflow valve 510, and the charge pump 505 are respectively connected to the oil tank 508 through the second filter 509, the third filter 513, and the first filter 507. The charge pump 505 is driven by the motor 506, and the electromagnetic overflow The flow valve 511 is connected and controlled by the loading system controller 40. The electromagnetic overflow valve 511 can dynamically adjust the pressure of the system through the loading system controller 40 to realize the dynamic change of the load, and realize the simulation of the load under the actual working condition. The ordinary overflow valve 510 functions to adjust the replenishing pressure. The specific working principle of the hydraulic loading system 5 is as follows:

When the upper part of the loading hydraulic pump 501 discharges oil and the lower part enters, the oil outlet from the oil outlet returns to the oil tank 508 through the first one-way valve 502, the electromagnetic overflow valve 511, and the third filter 513; The hydraulic oil is sucked into the lower oil inlet of the loading hydraulic pump 501 through the third one-way valve 504;

When the loading hydraulic pump 501 discharges oil from the lower part and enters the upper part, the oil from the oil outlet returns to the oil tank 508 through the fourth check valve 512, the electromagnetic overflow valve 511, and the third filter 513; The hydraulic oil is sucked into the upper oil inlet of the loading hydraulic pump 501 through the second one-way valve 503.

The working status indicator light 34 of the test bench is set in three colors of red, green and yellow. The instruction content is: set a green light indicator when working normally, a yellow light indicator when a normal shutdown, a red light indicator when an abnormal stop, and an audible alarm. The equipment alarm uses the indicator light and the text and sound instructions displayed by the equipment computer until the alarm release button is pressed.

The coupling, rotational speed and torque sensor, servo motor controller, D/A module, display, signal acquisition unit, speed control controller, loading system controller, flow sensor, pressure sensor, PLC and industrial control computer used in this embodiment are all It is a conventional equipment and is commercially available.

The basic working principle of the test bench: AC servo motor is used as the power source at the power input, and the hydraulic power flow and mechanical power flow are combined through a variable transmission ratio shunt mechanism to achieve a hydraulic and mechanical composite transmission, and then output through the confluence mechanism. The variable transmission ratio splitter mechanism can realize multiple adjustments of the input speed ratio of hydraulic transmission and mechanical transmission. Through the adjustment of the transmission ratio, the test determines the performance test and the optimal ratio distribution range of the hydraulic transmission unit that meets the entire composite transmission system. The AC servo motor of the power source compiles the control program according to the universal characteristic curve of the matching engine. Through the two-level control mode of the industrial control computer and PLC, the power characteristics of the engine can be simulated to provide the power source for the test bench. Try to make the tested hydraulic transmission unit The test conditions are the closest to the actual operating conditions, and the requirements for improving the test capability of the transmission system and expanding the test range; using AC servo motor as the power source, the structure is simple and reliable, the test is simple, and it is avoided in the case of indoor test bench testing. It has the characteristics of energy saving and environmental protection.

The power output end load simulation device uses a hydraulic loading system to simulate the load resistance of the vehicle's working road conditions. At the same time, the control system uses an industrial control computer and PLC two-level control method to simulate the power change of the power demand field in the vehicle power transmission system, thereby improving Transmission system test capability and requirements for expanding the scope of application.

Example 2:

As described in Example 1, the working method of a multi-function test bench for a power split hydraulic-mechanical composite transmission system, the input shaft and output shaft of the hydraulic transmission unit 3 to be tested are respectively connected to the ninth coupling 23, The third coupling 10 is connected and installed, and the mechanical connection and control circuit connection of other parts of the test bench are checked. After the check is correct, the test is prepared. The specific test process is as follows:

A: Under the two-level control of the industrial control computer 33 and PLC32, the AC servo motor 1 is used to simulate the actual working mode of the engine through the servo motor controller 30, and the loading hydraulic pump 501 in the hydraulic loading system 5 is made through the loading system controller 40 Set three working modes of constant torque, constant speed and constant power to simulate actual load conditions;

The AC servo motor 1 compiles the control program according to the universal characteristic curve of the selected matching engine. Through the two-level control mode of the industrial control computer 33 and PLC32, the power characteristics of the engine can be simulated to provide the power source for the test bench, and try to make the tested hydraulic transmission unit 3 The test conditions are the closest to the actual operating conditions.

The load simulation device at the power output adopts the hydraulic loading system 5, which is used to simulate the load resistance of the vehicle working condition. Under the two-stage control of the industrial control computer 33 and PLC32, the inclined axis plunger pump of the hydraulic loading system 5 can realize different working modes. :

(1) Constant torque mode. Under the adjustment control of the control system and the control program, the inclined axis plunger pump in this mode is compared and adjusted according to the feedback of the actual measured value of the torque and the given value. The hydraulic loading system controller 40 is used to control the solenoid according to the given value. The pressure setting mode of the relief valve 511 is automatically adjusted, and the relief pressure of the electromagnetic relief valve 511 is changed to change the torque of the input shaft of the inclined axis plunger pump to maintain it at the set value.

(2) Constant speed mode. Under the adjustment control of the control system and the control program, the inclined axis plunger pump in this mode is compared and adjusted according to the feedback of the actual measured value of the speed and the given value. The hydraulic loading system controller 40 automatically performs the given control mode. Adjust to keep it at the set value.

(3) Constant power mode. The inclined axis plunger pump maintains the power of the inclined axis plunger pump at a given value under the adjustment control of the control system and control program.

B: By adjusting the engagement of different clutches of the shunt mechanism 2, different shunting modes of hydraulic power flow and mechanical power flow are realized, so as to realize the performance test of different configuration schemes of the tested hydraulic transmission unit;

The engagement of the different clutches of the splitter mechanism 2 is realized by manually adjusting the transmission ratio handle before the test starts (change the left, middle and right positions of the triple sliding gear to make it different from the eighth, seventh, and sixth gears, respectively Engagement), there are 6 transmission route modes:

When the clutch A202 is engaged, the rotation speed of the output shaft 201 is opposite to the rotation speed of the input shaft 211, forming a reverse transmission mode. By changing the position of the triple sliding gear, three different transmission ratios can be achieved.

(1) Input shaft 211 → eighth gear 213 → third gear 206 → tenth gear 215 → eleventh gear 216 → first gear 203 → output shaft 201

(2) Input shaft 211 → seventh gear 212 → fourth gear 207 → tenth gear 215 → eleventh gear 216 → first gear 203 → output shaft 201

(3) Input shaft 211 → sixth gear 210 → fifth gear 208 → tenth gear 215 → eleventh gear 216 → first gear 203 → output shaft 201

When the clutch B204 is engaged, the rotation speed of the output shaft 201 is the same as the rotation speed of the input shaft 211, forming a forward transmission mode. By changing the position of the triple sliding gear, three different transmission ratios can be achieved.

(4) Input shaft 211 → eighth gear 213 → third gear 206 → ninth gear 214 → second gear 205 → output shaft 201

(5) Input shaft 211 → seventh gear 212 → fourth gear 207 → ninth gear 214 → second gear 205 → output shaft 201

(6) Input shaft 211 → sixth gear 210 → fifth gear 208 → ninth gear 214 → second gear 205 → output shaft 201

C: The speed controller 38 controls the engagement state of the two clutches in the confluence mechanism 4 to realize three different power transmission modes of the tested hydraulic transmission unit: forward confluence transmission power, reverse confluence transmission power, and single transmission power ；

The confluence mechanism sets the hydraulic transmission unit forward confluence transmission power mode according to the test requirements to realize the performance test when the hydraulic transmission unit is tested for the forward confluence transmission power; the confluence mechanism hydraulic transmission unit reverse confluence transmission power mode realizes the test hydraulic transmission unit reverse confluence transmission Performance test at power; it can also test the pure hydraulic power transmission mode. When the confluence mechanism 4 is set to switch from the above three working modes to each other, it can test the performance test of the hydraulic transmission unit of the multi-stage hydraulic-mechanical composite transmission system. When the confluence mechanism 4 is only provided with a single transmission power mode of the hydraulic transmission unit, the performance test of the pure hydraulic transmission system can be realized. The working mode of the two clutches in the confluence mechanism is controlled by the speed controller 38:

(1) Hydraulic transmission unit forward confluence transmission power mode

When the clutch C408 is engaged, the input shaft II412 is extended to connect with the mechanical transmission unit, the thirteenth gear 406 is connected with the ring gear of the planetary gear train II404, and the thirteenth gear 406 and the fourteenth gear 409 constitute a fixed shaft gear pair transmission. The sun gear of the wheel train II404 is installed on the input shaft I401. The input shaft I401 is extended to connect with the output shaft of the hydraulic transmission unit 3. The output shaft 407 of the confluence mechanism is connected with the planet carrier of the planetary gear II404. At this time, the speed of the output shaft 407 of the confluence mechanism is With the increase of the rotational speed of the input shaft I401 of the connecting shaft of the hydraulic transmission unit, it constitutes a positive confluence transmission whose output speed increases with the increase of the output rotational speed of the hydraulic motor of the hydraulic transmission unit 3.

(2) Reverse confluence transmission power mode of hydraulic drive unit

When the clutch D411 is engaged, the input shaft II 412 is extended to connect with the mechanical transmission unit, the twelfth gear 402 is connected with the planet carrier of the planetary gear train I 403, and the fifteenth gear 410 and the twelfth gear 402 constitute a fixed shaft gear pair transmission. The sun gear of the gear train I403 is installed on the input shaft I401. The input shaft I401 is extended to connect with the output shaft of the hydraulic transmission unit. The output shaft 407 of the confluence mechanism is connected with the ring gear of the planetary gear train I403. At this time, the speed of the output shaft 407 of the confluence mechanism follows The rotation speed of the input shaft I401 of the connecting shaft of the hydraulic transmission unit increases and decreases, forming a reverse confluence transmission whose output rotation speed decreases with the increase of the output rotation speed of the hydraulic motor of the hydraulic transmission unit.

(3) Single transmission power mode of hydraulic drive unit

When the clutch C408 and the clutch D411 are disconnected and the brake 405 is closed, the ring gear of the planetary gear train II404 is braked, and the planetary gear train II404 changes from two degrees of freedom to one degree of freedom, and the input shaft II412 of the mechanical transmission unit does not work. Power transmission, the input shaft 401 power input of the connecting shaft of the hydraulic transmission unit, the power output of the confluence mechanism output shaft 407;

When clutch C408 and clutch D411 are both engaged, and the splitter mechanism clutch A202 and clutch B204 in Figure 3 are both disconnected, the three elements of planetary gear train I403 and planetary gear train II404 have the same speed, forming a direct transmission with a transmission ratio of 1. The input shaft II412 connected to the mechanical transmission unit has no power input. The input shaft I401 power input of the hydraulic transmission unit connection shaft, and the output shaft 407 power output of the confluence mechanism.

Under the two-level control program of the industrial control computer 33 and PLC32, choose the different combination modes of A, B, and C, that is, the different working modes of the AC servo motor, the different working modes of the hydraulic loading system, and the different shunting modes of the shunt mechanism , Under the combination of different power transmission modes of the confluence mechanism, dynamic loading can be realized through the control program, which simulates the actual working conditions and the specified cycle working conditions of the hydraulic-mechanical composite transmission system; the control system and the control program can be based on different test and test schemes. Set different settings for the rotational speed and torque of the inclined axis plunger pump of the AC servo motor 1 at the input and the hydraulic loading system 5 at the output. The closed-loop control method is adopted, which can fully meet the requirements of the hydraulic transmission unit of the hydraulic-mechanical hybrid power transmission system. Performance test and ratio test of mechanical transmission power flow and hydraulic transmission power flow of the entire transmission system.

During the test, according to the actual requirements, the operator will debug the control program and press the start button, which can realize the control and performance test of the whole process; each measured value and analysis result in the test can be real-time through the industrial control computer and display Display, process, store and print. Compared with the traditional test bench, this test bench can easily and reliably perform the performance test of the hydraulic transmission unit of the hydraulic-mechanical composite transmission system, save a lot of test time and cost, and realize the performance test, mechanical and mechanical performance of the tested hydraulic transmission unit. Ratio test of hydraulic power flow and smooth performance test of section change.

For the operator, facing the entire test bench, the basic operation sequence is simply: installation→adjust the transmission ratio handle of the shunt mechanism (setting for different modes of B)→input debugging control program (for different modes of A and C) Setting)→Run test→End of test→Output result.

Claims (10)

1. A power split type hydraulic-mechanical composite transmission system multifunctional test test bench, which is characterized in that it comprises a platform and a control system;

   The platform is equipped with an AC servo motor, a shunt mechanism, a tested hydraulic drive unit, a confluence mechanism, and a hydraulic loading system;

   The output shaft of the AC servo motor is connected to one end of the input shaft of the shunt mechanism through the first coupling, the input speed torsion sensor, and the second coupling in turn; the output shaft of the shunt mechanism passes through the eighth coupling and the rotational speed of the mechanical transmission unit in turn The torque sensor and the seventh coupling are connected to an input end of the confluence mechanism; the output end of the confluence mechanism is connected to the hydraulic loading system through the fifth coupling, the output speed torque sensor, and the sixth coupling in turn; the tested hydraulic transmission The input shaft of the unit is connected to the other end of the input shaft of the shunt mechanism through the ninth coupling, the speed torque sensor at the input end of the hydraulic transmission unit, and the tenth coupling. The output shaft of the tested hydraulic transmission unit sequentially passes through the third coupling The output end of the hydraulic transmission unit, the speed torque sensor, and the fourth coupling are connected to the other input end of the confluence mechanism;

   The control system includes industrial control computer, PLC, input PLC D/A module, output PLC D/A module, signal acquisition unit, pressure sensor, flow sensor, speed controller, loading system controller, servo motor control Device

   The pressure sensor and the flow sensor are installed on the tested hydraulic transmission unit. The industrial control computer connects the input speed torque sensor through the signal acquisition unit, the output speed torque sensor of the hydraulic transmission unit, the output speed torque sensor, and the input speed of the hydraulic transmission unit. Torque sensor, flow sensor, pressure sensor, mechanical transmission unit speed torque sensor; AC servo motor is connected to PLC through the servo motor controller and the D/A module of the input end PLC in turn, the tested hydraulic transmission unit and confluence mechanism are respectively connected to speed regulation The controller and the speed control controller are then connected to the PLC, the hydraulic loading system is connected to the PLC through the loading system controller and the D/A module of the output PLC in turn, and the PLC is connected to the industrial control computer.
2. The multifunctional test bench according to claim 1, wherein the AC servo motor is fixed on the platform by T-bolts.
3. The multifunctional test bench according to claim 1, wherein the input speed torque sensor, the hydraulic transmission unit input speed torque sensor, the mechanical transmission unit speed torque sensor, the hydraulic transmission unit output speed torque sensor, The output speed torque sensor is fixedly installed on the platform through a fifth sensor bracket, a fourth sensor bracket, a third sensor bracket, a first sensor bracket, and a second sensor bracket.
4. The multifunctional test bench according to claim 1, wherein the shunt mechanism includes a box, an input shaft and an output shaft, both ends of the input shaft extend out of both sides of the box, and the output shaft extends out of the box. Side; inside the box, the first gear is installed on the input shaft through clutch A, the second gear is installed on the input shaft through clutch B, the eleventh gear is installed on the reversing shaft, the tenth gear and the ninth gear are installed On the intermediate shaft, the third gear, the fourth gear and the fifth gear form a triple sliding gear which is mounted on the intermediate shaft through a spline shaft, and the sixth gear, the seventh gear and the eighth gear are mounted on the output shaft.
5. The multifunctional test bench according to claim 1, wherein the confluence mechanism comprises a box body, an input shaft I, an input shaft II and an output shaft, and the input shaft I and the input shaft II extend out of the box body side, The output shaft extends on the other side of the box; inside the box, the fifteenth gear is mounted on the input shaft Ⅱ through clutch D, the fourteenth gear is mounted on the input shaft Ⅱ through clutch C, planetary gear train I and planetary gears The sun gear of system II is installed on the input shaft I, the twelfth gear is connected with the planet carrier of the planetary gear system I, the thirteenth gear is connected with the ring gear of the planetary gear system II, and the ring gear of the planetary gear system I is connected with the planetary gear. The planet carrier of system II is connected, and the planet carrier of planetary gear system II is connected with the output shaft; the fifteenth gear and the twelfth gear constitute a fixed-axis gear pair, and the thirteenth gear and the fourteenth gear constitute a fixed-axis gear pair.
6. The multifunctional test bench according to claim 1, wherein the hydraulic loading system includes a loading hydraulic pump, a first one-way valve, a second one-way valve, a third one-way valve, and a fourth one-way valve , Charge pump, motor, first filter, second filter, third filter, ordinary overflow valve, electromagnetic overflow valve and fuel tank; first check valve, second check valve, third check valve , The fourth one-way valve is connected to form a regulating valve group. The loading hydraulic pump is an inclined axis bidirectional hydraulic pump. The upper and lower ends of the loading hydraulic pump, the electromagnetic overflow valve, and the charge pump are respectively connected to the regulating valve group and charge pump through four oil lines. The oil circuit between the valve group and the regulating valve group is connected with a common relief valve. The electromagnetic relief valve, common relief valve and charge pump are respectively connected to the fuel tank through the second filter, the third filter and the first filter. The charge pump is driven by the motor Driven, the electromagnetic overflow valve is connected and controlled by the loading system controller.
7. The multifunctional test bench of claim 6, wherein the transmission shaft of the loading hydraulic pump is connected to the sixth coupling through the loading hydraulic pump mounting seat, and the input shaft of the tested hydraulic transmission unit passes The variable hydraulic pump mounting seat is connected to the ninth coupling, and the output shaft of the tested hydraulic transmission unit is connected to the third coupling through the hydraulic motor mounting seat.
8. The multifunctional test bench according to claim 7, wherein the loading hydraulic pump mounting seat, the variable hydraulic pump mounting seat, and the hydraulic motor mounting seat are all provided with an oil receiving groove, and the bottom of the oil receiving groove passes through a T-bolt Fixed on the platform.
9. The multifunctional test bench according to claim 1, wherein the industrial control computer is also connected with a working status indicator, a display, and an alarm, and the working status indicator includes red, yellow, and green lights.
10. A working method of the power split type hydraulic-mechanical composite transmission system multifunctional test test bench according to any one of claims 1-9, comprising the following steps:

    Under the two-level control of industrial control computer and PLC, the AC servo motor is used to simulate the actual working mode of the engine through the servo motor controller, and the hydraulic loading system is set to work with constant torque, constant speed and constant power through the loading system controller. Mode to simulate actual load conditions;

    By adjusting the engagement of different clutches of the splitter mechanism, different splitting modes of hydraulic power flow and mechanical power flow are realized, so as to realize the performance test of different configuration schemes of the tested hydraulic transmission unit;

    Through the speed controller to control the engagement state of the two clutches in the confluence mechanism, three different power transmission modes of the tested hydraulic transmission unit are forward confluence transmission power, reverse confluence transmission power, and single transmission power;

    Finally, under the combination of different working modes of the AC servo motor, different working modes of the hydraulic loading system, different shunting modes of the shunt mechanism, and different power transmission modes of the confluence mechanism, the performance test of the tested hydraulic transmission unit is realized. Ratio test of mechanical and hydraulic power flow and smooth performance test of changing section.

Images