6 曰立 2002 excavator engine stall fault diagnosis Long Weihong 2 hydraulic excavator main pump is a variable flow plunger pump, the main pump swashplate angle and engine load respectively by the household pump valve control computer and engine control computer hydraulic system various The parameters collected by the sensor are input to the user's factory, and, 痪 缒, 缒 觥 觥 6. 螅 螅, 髦, 畲, nbsp; to the engine, the control motor and the main pump displacement solenoid valve and other actuators, so that the engine operating conditions Adapt to the excavator machine condition to obtain the best working efficiency. Failure of the excavator's main pump displacement angle sensor or wiring harness will prevent the user from receiving the correct swashplate angle signal, thus causing the engine to stall. This article mainly analyzes the failure of the main pump displacement angle sensor and its causes. 1 Working principle of hydraulic and electric control system The plunger sleeve of main pump of Xie excavator is changed within the range of 2,24 under the action of servo piston. When the angle between plunger sleeve and input shaft is 2, the main pump The output flow is minimal; when the angle between the plunger sleeve and the input shaft is 24, the output flow of the main pump is maximum. The principle sensor is the main pump displacement angle sensor measuring and transmitting the data to the user's factory. The main pump controls the computer. At the same time, the speed sensor sensor and the pressure sensor household sensor also transmit the signal to the control computer, and the computer comprehensively analyzes and compares these data. , Output signal to No. 1 displacement solenoid valve and No. 2 displacement solenoid valve, through the combination of 1 and 2 displacement solenoid valves on and off to adjust the size of the main pump displacement. Differential Pressure Transducer, Main Pump Angle Sensor, Operating System Switch, Automatic Idle Switch, Shen Control Sensor No. 1 Sample Solenoid Valve No. 2 Wipe Solenoid Valve Guide Solenoid Valve Electromagnetic Proportional Valve Buckle Control Motor When Main Pump Plunger Shaft Clamp When the angle is at the minimum position in the 2 position, the No. 1 displacement solenoid valve is closed, No. 2 displacement solenoid valve is opened, and the hydraulic oil enters the servo cylinder cylinder magnetic valve return tank under the action of the pilot oil pump. When No. 1 displacement solenoid valve is on and No. 2 displacement solenoid valve is closed, the hydraulic oil enters the size of the cylinder of the servo piston under the action of the pilot oil pump. Because the oil pressure in the chamber is equal, the cross-sectional area of ​​the large chamber is larger than the small chamber. Cross-sectional area, so the servo piston to overcome the small chamber pressure and move to the bottom end, the main pump plunger sleeve and the angle between the axis increases, the main pump output flow will increase. When the user's factory, the computer output command to make the No. 1 and No. 2 displacement solenoid valves are closed, the hydraulic oil circuit of the servo piston cylinder cavity is disconnected, the servo piston can not move, so the main pump axis angle is maintained in In a stable position, the output flow of the main pump remains unchanged. 2 Fault phenomenon The engine starts smoothly and can run stably at idle speed. Select! There is no change in the rotational speed of the engine in any mode of the home operating system switch, and any operation is performed, and the engine is turned off. 3 Troubleshooting 3.1 Checking the Error Using the Diagnostic Tool The ignition switch is set to position 07 and the dedicated diagnostic unit is connected to the computer's main pump diagnostic station. Turn on the ignition, off, read the fault code, on the diagnostic instrument screen display code 29, the code fault, the sensor is the main pump displacement angle sensor, the input signal voltage is greater than 4.75, possibly because the sensor is damaged or the sensor is There is a short circuit in the harness between the computers. 3.2 Check the wiring harness between the household 1 computer and the 4 sensor. Ignition, dismantle and remove the sensor harness connector. Turn on the ignition switch and measure the voltage between terminal No.1 and terminal No.3 of the harness connector. The normal value is 5±5. The measured voltage is normal, indicating that the wiring harness between the computer in the factory and the sensor is connected properly. 1. Engine 2. Main pump 3.4 Angle sensor 4 Force sensor 5.2 No. 61 solenoid valve No. 61 Discharge solenoid valve 7. Servo piston 8. Gear pump 9. Speed ​​sensor 1 output signal line. The computer 12 inputs the signal wire, and terminals 1 and 2 of the connector are short-circuited with the wire. At this time. If the diagnostic sensor is at the maximum, the harness between the 32-pin hole on the end of the PC and the 2nd end of the sensor is normal. The actual measurement is 13. The line between the home computer and the sensor is normal. 33 Check 4 The sensor uses universal measurement. The resistance value between sensor resistances 1 and 3 is 0.06. The resistance value between 2 and 3 indicates 0.04. This indicates that the sensor has been short-circuited internally. the same. 3.4 Replacing the 4 Sensors When replacing the sensor, the sensor harness must be removed in the following procedure. Remove harness connector screw and sensor mounting screw. Remove the susceptor, and be careful not to lose the core gasket and roll. Install a new sensor. (1) After mounting the ring on the sensor base and applying a little grease on the roll, insert the coil spring latch into the No. feedback shaft notch. Checkpoint pull rod. Stand-up stick action exceeds the system overflow force system standard system standard system-based estimator and intrusion 2,1.06 When the pin is inserted into the signal feedback shaft slot. Be careful to align the mark on the sensor latch with the mark on the sensor housing, otherwise the sensor will send the wrong signal to the production computer. The door sensor temporarily tightens the two screws to start the engine, allowing it to run at idle speed. Remove the harness connector of the two displacement solenoid valves on top of the main chestnut. Wait until the 34,17 to the pump reaches the maximum flow rate. Use a voltage between digital harness 2 and 3 of the digital universal measurement sensor. Then adjust the position of the sensor until the universal reading reaches 4.4. 13 Tighten the sensor. Bolt, connect two rows of test electromagnetic seven plugs. In this case, the sensor and the alignment are all checked and installed. Start the engine test, troubleshooting. 35 Confirming the parameters when the sensor is working Connect the diagnostic tool to the diagnosis port of the user 1 = start the engine. The hydraulic system is heated so that it can be checked according to the working status of the excavator. The parameter values ​​of the sensor under different conditions are: 1. The actual operation to check the parameters under various conditions. Meet all requirements. So far. Confirm that the main pump displacement sensor and its line are normal, Long Weihong, Department of Mechanical and Electrical Engineering, Highway and Engineering Bureau, China Road and Bridge Group, 124 Guanzhuang Zhoujiajing Courtyard, Chaoyang District, Beijing, China Received 20020531 Editor's translation After 52 pages, use mouse Drag these standard electrical components and move them to the specified location. This function is mainly implemented by anti-aliasing on the basis of gram. In the function that deals with mouse movement, the drawn shape is firstly inverted. Makes the shape drawn last time hidden. In order to avoid interference. Then move the mouse to a new location to record it. In this new location, a new Gemini 4 is designed to design a smart inspection database. Build a database of 4 errors that can occur. In this way, when the user stores the shape, it can be detected whether the circuit contains an error, and a window appears, telling the user what is wrong, to help the user to modify. In the form of storage, we have selected the topological method and the lattice type description method. When the system was designed, it integrated the advantages of the topological method and the dot matrix method. The old-style description of dot matrix is ​​relatively simple. Intuitive operation, the disadvantage is that it is not easy to rotate proportional amplification and shear shape operation, and the dot matrix type needs to store the entire shape, resulting in memory space memory, hard disk, etc. too much of the claws, and there is a need to describe a small number of feature points, And add the relationship between points to give shape. The advantages of the topological method 6 occupy less storage space, and the editing operations of automorphism, such as rotation scale up and shearing, greatly increase the speed, but it is not as intuitive as the dot matrix.
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