Loader cyclic working condition testing device

Abstract

The invention discloses a testing device for the cyclic working condition of a loading machine. The system belongs to the technical field of simulation testing and comprises an engine and control system, a transmission and control system, a hydraulic control system, a dynamometer, a dsPACE system, a computer and the like. The numerical cycle working condition of the loading machine is stored in the computer, executable codes are generated according to the numerical cycle working condition through a dsPACE system, the fuel injection quantity of an engine is controlled through VCU Link, and the rotating speed and the torque of the engine are controlled to run according to the cycle working condition. Controlling the pressure of the proportional overflow valve, and simulating the power consumed by the hydraulic system under the cyclic working condition of the loader; the gear of the gearbox and the load applied by the dynamometer are controlled through the TCU, and the power consumed by the driving system and the shovel loading operation in the cyclic working condition of the loader is simulated. According to the invention, the operation of each system in the working process of the loader under the cyclic working condition can be simulated, the matching rationality, the dynamic property and the fuel economy of the power transmission system of the loader are tested, and a test basis is provided for the design and development of the loader.

Description

Technical Field

[0001] The invention belongs to the technical field of simulation testing, and relates to a loader cycle working condition testing device; specifically, relates to a loader cycle working condition testing platform. Background Art

[0002] In the automotive field, the parameters of the automotive powertrain system have a significant impact on the power and fuel economy of the vehicle. During the design and development of the vehicle, the vehicle cycle conditions (such as WLTC conditions and CLTC conditions) are used to test the power, fuel consumption and pollutant emissions of the vehicle engine, and then examine whether the parameter design of the automotive powertrain system is reasonable. However, the bench test of the traditional loader power system currently generally adopts the eight-condition steady-state cycle test and the NRTC transient cycle test. There is no loader cycle test similar to the vehicle cycle test, which is quite different from the actual application conditions of the loader, and its power and fuel economy cannot be predicted based on the loader cycle condition. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to propose a loader cycle operating condition testing device, which can simulate different loader cycle operating conditions such as "I" shape, "L" shape, "T" shape and "V" shape. Through this test bench, the power and fuel economy of the loader under different cycle operating conditions can be tested.

[0004] The technical solution of the present invention is: a loader cycle working condition test device of the present invention comprises an engine, a torque speed sensor 1, a hydraulic torque converter, a gearbox, a torque speed sensor 2, a dynamometer, a dsPACE system, a proportional relief valve, a flow meter and a hydraulic pump connected to each other;

[0005] The engine is connected to a torque speed sensor 1, the other end of the torque speed sensor 1 is connected to a torque converter, the other end of the torque converter is connected to a gearbox, the other end of the gearbox is connected to a torque speed sensor 2, and the other end of the torque speed sensor 2 is connected to a dynamometer.

[0006] Furthermore, the dsPACE system is connected to the engine, and a VCU Link is connected between the two.

[0007] Furthermore, the dsPACE system is also connected to a gearbox, with a TCU connected between the two.

[0008] Furthermore, the dsPACE system is also connected to a dynamometer, and a dynamometer controller is connected between the two.

[0009] Furthermore, the information collected by the dynamometer through the sensor is fed back to the dsPACE system (7) through the dynamometer controller.

[0010] Furthermore, the dsPACE system is also connected to a proportional relief valve, the other end of the proportional relief valve is connected to a flow meter, and the other end of the flow meter is connected to a hydraulic pump;

[0011] The hydraulic pump is connected to the torque converter.

[0012] Furthermore, a pressure sensor is installed between the flow meter and the hydraulic pump.

[0013] Furthermore, the flow meter and pressure sensor feed back the information collected by the sensors to the dsPACE system (7).

[0014] Furthermore, the torque-speed sensor 1, the gearbox, and the torque-speed sensor 2 all feed back the information collected by the sensors to the dsPACE system.

[0015] Furthermore, it also includes a computer, and the dsPACE system and the computer are interconnected.

[0016] The beneficial effects of the present invention are as follows: the present invention utilizes the digitized loader cycle conditions to virtually test the power and fuel economy of the loader during the design stage of the loader, providing a reference for matching the loader's power transmission system and optimizing its economic performance, which has engineering significance for the design and development of the loader. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] In the figure: 1 is the engine, 2 is the torque speed sensor 1, 3 is the torque converter, 4 is the gearbox, 5 is the torque speed sensor 2, 6 is the dynamometer, 7 is the dsPACE system, 8 is the proportional relief valve, 9 is the flow meter, 10 is the pressure sensor, and 11 is the hydraulic pump. DETAILED DESCRIPTION

[0019] The specific technical solutions of the present invention are further described in detail below in conjunction with specific examples.

[0020] As shown in the figure, a loader cycle condition test device according to the present invention includes an engine and control system, a transmission and control system, a hydraulic control system, a dsPACE system 7, an eddy current dynamometer and an eddy current controller, an industrial computer and a computer, etc.;

[0021] The engine and control system includes an engine 1 and a VCU Link; the VCU Link controls the fuel injection amount of the engine 1 so that the engine 1 operates according to the torque and speed of the cyclic working condition;

[0022] The transmission and control system includes a torque converter 3, a gearbox 4 and a TCU; the front end of the torque converter 3 drives a hydraulic pump 11 through a power take-off window;

[0023] The TCU controls the gear position of the gearbox 4 so that the output speed of the gearbox 4 matches the driving speed of the cycle condition through the transmission ratio conversion;

[0024] The hydraulic control system includes a hydraulic pump 11, a pressure sensor 10, a flow meter 9 and a proportional relief valve 8; the flow meter 9 mainly measures the flow of the liquid; the pressure of the proportional relief valve 8 is controlled so that the power consumed by the hydraulic system is consistent with the power consumed by the hydraulic system in the cyclic working condition;

[0025] The VCU vehicle electronic controller controls the fuel injection amount of the engine 1;

[0026] The dynamometer 6 is mainly used to simulate the driving resistance and digging resistance of the loader during operation; the braking torque of the dynamometer is controlled to match the output speed of the gearbox 4 with the driving speed of the cycle condition.

[0027] The industrial computer is equipped with a dsPACE simulation system (dsPACE system 7);

[0028] The dsPACE system 7 is mainly used to realize automatic generation and downloading of codes and testing and debugging;

[0029] It includes the supporting software Control Desk, which mainly builds a monitoring interface on the host computer to collect, record and display experimental data;

[0030] The computer stores digitized loader cycle conditions; that is, the computer stores a variety of constructed digitized loader cycle conditions, which are mainly composed of time series parameters such as the torque and speed of the engine 1, the pressure and flow of the hydraulic system, the torque and speed of the transmission shaft, and the driving speed. The computer can generate real-time code for the cycle conditions and download it to the Autobox software in the computer.

[0031] The cyclic working conditions of the loader include several forms such as "I" shape, "L" shape, "T" shape and "V" shape; the following is a more comprehensive description of the present invention with reference to the "V" type cyclic working condition of the ZL50 loader and Figure 1.

[0032] The cyclic working conditions of the embodiment include five working stages: no-load forward, shoveling and loading, heavy-load reverse, heavy-load forward unloading and no-load reverse, and are mainly composed of time series parameters such as the torque and speed of the engine 1, the pressure and flow of the hydraulic system, the torque and speed of the transmission shaft, and the driving speed.

[0033] Specifically, the torque and speed of the engine 1 of the test loader cycle are collected to construct the engine power time history; the pressure and flow of the working pump, steering pump and transmission pump are collected to construct the hydraulic system power consumption time history;

[0034] The torque and speed of the transmission shaft are collected to construct the time history of the power consumption of the driving system; various numerical cycle conditions of the loader are constructed through analysis and test data processing.

[0035] The digitized cycle conditions of the loader are stored in the computer, and the dsPACE system 7 generates executable codes from the digitized cycle conditions of the loader. The executable codes control the fuel injection amount of the engine 1 through the VCU Link vehicle electronic controller to achieve power control of the engine 1.

[0036] Part of the loader's engine power needs to go through the transmission system to overcome the loader's rolling resistance, air resistance, acceleration resistance and shoveling resistance, and the other part of the engine power is used to drive the hydraulic system.

[0037] The engine power is transmitted to the hydraulic torque converter 3 by means of a torque speed sensor 2 mounted on a power transmission shaft between the engine 1 and the hydraulic torque converter 3;

[0038] Among them, this part of the engine power used to drive the hydraulic system drives the hydraulic pump 11 to work through the front end power take-off window of the torque converter 3;

[0039] The dsPACE system 7 controls the pressure of the proportional relief valve 8 according to the executable code generated by the pressure and flow of the hydraulic system in the digitized cycle condition, simulating the power consumed by the hydraulic system in the loader cycle condition, so that the power consumed by the hydraulic system is consistent with the power consumed in the cycle condition.

[0040] In addition, the engine power used to overcome the walking and shoveling resistance of the loader during operation is output through the gearbox 4; the automatic shift control model in the dsPACE system 7 makes a gear decision based on the acquired state parameters according to the shift rules stored therein, and transmits them to the automatic transmission electronic control unit TCU to control the action of the shift solenoid valve on the gearbox 4 to achieve the purpose of automatic shifting, so that the output speed of the gearbox is matched with the driving speed of the cyclic working condition through transmission ratio conversion.

[0041] The real-time code in the dsPACE system 7 related to the parameters such as the torque and rotation speed of the transmission shaft and the driving speed controls the eddy current dynamometer 6 using the eddy current controller to simulate the driving resistance and digging resistance during the operation of the loader;

[0042] According to the cyclic working condition model in the system, the braking torque of the dynamometer 6 is controlled by using an eddy current controller so that the output speed of the gearbox 4 matches the driving speed of the cyclic working condition.

[0043] This equipment can simulate the operation of each system of the loader during operation. The torque speed sensor 1 2 and torque speed sensor 2 5, gearbox 4, flow meter 9, pressure sensor 10 and dynamometer 6 in the figure are respectively connected to the dsPACE system 7 via the CAN bus, so that the supporting software Control Desk of the dsPACE system 7 builds a monitoring interface on the upper computer to collect, record and display the torque speed of the engine 1, the torque speed of the transmission shaft, the driving speed and other data in real time during the operation of the test bench, so as to complete the calculation of the power and fuel economy of the loader.

Claims

1. A loader cycle condition test device, characterized in that: It comprises an engine (1), a torque and speed sensor 1 (2), a hydraulic torque converter (3), a gearbox (4), a torque and speed sensor 2 (5), a dynamometer (6), a dsPACE system (7), a proportional relief valve (8), a flow meter (9) and a hydraulic pump (11) which are interconnected; The engine (1) is connected to a torque speed sensor (2), the other end of the torque speed sensor (2) is connected to a hydraulic torque converter (3), the other end of the hydraulic torque converter (3) is connected to a gearbox (4), the other end of the gearbox (4) is connected to a torque speed sensor (5), and the other end of the torque speed sensor (5) is connected to a dynamometer (6).

2. A loader cycle condition test device according to claim 1, characterized in that: The dsPACE system (7) is connected to the engine (1), and a VCU Link is connected between the two.

3. A loader cycle condition test device according to claim 1, characterized in that: The dsPACE system (7) is also connected to the gearbox (4), with a TCU connected between the two.

4. A loader cycle condition test device according to claim 1, characterized in that: The dsPACE system (7) is also connected to the dynamometer (6), with a dynamometer controller connected between the two.

5. A loader cycle condition test device according to claim 4, characterized in that: The dynamometer (6) feeds back the received information to the dsPACE system (7) via a dynamometer controller.

6. A loader cycle condition test device according to claim 1, characterized in that: The dsPACE system (7) is also connected to a proportional relief valve (8), the other end of the proportional relief valve (8) is connected to a flow meter (9), and the other end of the flow meter (9) is connected to a hydraulic pump (11); The hydraulic pump (11) is connected to the hydraulic torque converter (3).

7. A loader cycle condition test device according to claim 6, characterized in that: A pressure sensor (10) is also installed between the flow meter (9) and the hydraulic pump (11).

8. A loader cycle condition test device according to claim 6, characterized in that: The flow meter (9) and pressure sensor (10) feed back the received information to the dsPACE system (7).

9. A loader cycle condition testing device according to claim 1, characterized in that: The torque speed sensor 1 (2), the gearbox (4) and the torque speed sensor 2 (5) all feed back the received information to the dsPACE system (7).

10. A loader cycle condition testing device according to claim 1, characterized in that: It also includes a computer, and the dsPACE system (7) is connected to the computer.

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