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The 320 d type excavator carter engine control circuit principle and fault diagnosis method

by:HMB     2021-01-25
320 d type excavator carter engine control circuit principle and fault diagnosis methods 320 d type excavator carter of engine and hydraulic system adopt computer control, if the engine circuit malfunction, directly affect the excavator normal operation. This paper introduces the aircraft engine control circuit principle and fault diagnosis methods. Engine control circuit of the 320 d type excavator carter engine control circuit mainly by the battery 1, 2, start generator relay 3, start the machine safety relay 4, throttle control actuators 5, 6, time relay ignition switch 7, 8, neutral relay gap switch 9, start the electrical magnetic coil 10, 11, starter battery relay 12 and related wire, etc. Ignition switch 7 have downtime ( 关闭) , open, ) And start ( S) 3 position, as shown in the appended drawings. The working principle, 1) Whole vehicle power supply will be ignition switch 7 dry ON location, engine control circuit connected to the positive output current of battery by 10 a insurance, ignition switch 7 terminal R, battery relay coils, 12 by iron wire, circuit breakers back up to a battery, the battery 12 main contact K4 relay closure. The closed contact K4, battery anode current through the battery relay K4, electrical equipment, take iron terminal and cut-off switch back to the battery cathode, excavator power supply circuit connected electrical equipment. ( 2) Start-up circuit puts ignition switch 7 ON location, the positive output current of battery, through 10 a CONN89 insurance and outlet terminals 1 to 6 power supply time relay. At the same time the positive output current of battery, ignition switch 7 terminal through 10 a insurance CONN89 R and outlet terminal 4 to 6 into the ignition switch time relay 7 through signal, time relay 7 immediately 24 v output voltage, socket CONN89 terminal 3 plug into the socket CONN11 terminal 1, 5 power supply to the throttle actuator. The positive output current of battery, ignition switch 7 terminal through 10 a insurance CONN11 R and outlet terminals to throttle actuator 5 6 7 through to signal into the ignition switch, throttle actuator send instructions according to the computer, the engine throttle to set the position of the throttle knob. 9 neutral switch Settings on the hydraulic lock, when hydraulic locks, its load disconnect, neutral switch 9 contact K3 closed, the 24 v voltage through socket CONN89 terminal 3, the terminal C, neutral switch socket CONN1 9 contact K3, the terminal and neutral A relay socket CONN1 8 coil wire take iron, neutral relay 8 work, its close contact K2, make the engine start. When lifting hydraulic lock, the whole vehicle can be action, start the electrical magnetic coil 11 electric shock K3 disconnect, neutral relay 8 shock K2 disconnect, can't start the engine at this time. Neutral switch 9's role is to prevent the engine load start. ( 3) Start the engine down hydraulic lock lever, hydraulic locks, neutral switch 9 contact K3, neutral relay K2 closure of 8. Turn the ignition switch 7 to start position, the positive output current of battery, ignition switch 7 terminal through 10 a insurance of 8 S, neutral relay contact K2, socket CONN3 terminals 1, 3, start relay coil of the terminal 2, start the machine safety relay socket CONN3 4 S, CONN2 GND terminal and outlet terminals 3 reached by wire by iron. Start relay 3 closed contact K1, at this time to start the machine control circuit connected to the positive output of the storage battery current through 60 a insurance, start relay 3 K1 contact, 10 suction L2 coil electromagnetic switch, start the electromechanical L3 armature winding, wire, circuit breakers to battery cathode, at the same time keep the coil electromagnetic switch 10 L1 electricity, start the mechanical and electrical magnetic switch core in attracting coil L1 L2 and maintain coil electromagnetic attractive under the joint action of inhaled, through the fork will start the machine drive gear, make its and flywheel ring gear meshing. When starter gear meshing, the close contact of electromagnetic switch 10 K, start the main circuit connected to the positive output current of battery by electromagnetic switch contact K L3, start the machine winding wire, circuit breakers, reach the battery cathode, start the machine drives the engine starting rotation. At this point, to attract the coil L2 was short circuit, electromagnetic switch activity core only by a magnetic coil L1 keep in close position, until the engine is running. Engine starting, the generator 2 midpoint voltage rise to about 14 v P, its output current through the terminal 2, start the machine safety relay socket CONN2 4 terminals P, make the safety relay terminal within the 4 S &gnd disconnect, start relay 3 coil current to cut off the starter relay contact K1 disconnect 3, 10 of electromagnetic switch to keep the current in the coil L1 disappear, activity core back to the in situ, start the main contact K off, cut off the starter circuit, start the machine electricity, the starter drive gear under reaction exit the meshing state, start the process over. This time even if the ignition switch 7 is still in the starting position, because the start machine start circuit disconnect, start the machine automatically stop working, and to start the machine protection. Disappear after stalling the engine, generator neutral P voltage, safety relay terminal within the 4 P and terminal GNG closed, at this time can restart the engine.
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