The graph is common car on the circuit that start dominates loop picture, started essence is to let accumulator power supply work according to due technological process to the electric machinery that start, control batch of fork to make the gear that start and clench the teeth of tooth of flying teeth of a cogwheel good through power supply to electro-magnet, the excitation that gives electric machinery at the same time and armature loop electrify, it is certain that after letting electric machinery rotate, engine is driven to rotate rotate speed, be equivalent to giving engine initiative " the first impetus " , let engine igniting car.
Because there is very great pressure inside engine crock, resistance of the instant that start will be very great, the working electric current of the electric machinery that start also is met very tall, it is 600A left and right sides commonly, of some block muscularity be as high as 1000 to install for an instant even, the storage battery that start if ageing is deficient perhaps report, may appear the capacity is insufficient, the instant can be pulled low very much voltage, the electric machinery that start is dc machine, its rotate speed direct ratio at armature the voltage of two end, because storage battery power supply is not worth and such meetings cause electric machinery rotate speed too low, then the rotate speed of engine is insufficient also and cannot start normally. This kind of circumstance can hear voice of the electric current that start apparently bigger, and engine sound is grave abrupt even. If press horn, cracked, open headlight is darker also, prove those who cause the n that is storage battery is insufficient.
If twist key appearance to express all dish of lamps not to shine, and the relay that start is done not have " bang " sound, often be accumulator does not have report completely, storage battery may discard as useless thoroughly, if be storage battery used 2-3,this kind of circumstance appears after year, the probability with bad storage battery is quite high still. Or masterstroke road is caused without electrify, for instance circuit joint appears become loose, storage battery negative pole may have oxidation to corrode, insurance was burned, or key ignition switch became bad cause etc. If appearance dial shows normal, voice of the taxi moment electric machinery that start is very strong, test headlight and horn are normal also, can prove accumulator is normal commonly. Often need to check sparkplug at that time, high-pressured bag, whether does the link such as oil path have a problem.
As to the electric machinery that start, also not be to say it won't bad, but if bad, you are returned from outside solely is not quite good judgement, need measures voltage to give the excitation of electric machinery and armature coil with avometer first, if have voltage and the electric machinery that start does not work, perhaps start voltage below reasonable circumstance, the rate that electric machinery rotates is very slow, the electric current that start is very big wait, can be being judged is problem of interior of the electric machinery that start.
Whether does the electro-magnet of the electric machinery that start work normally, whether does carbon brush wear away etc, whether was coil burned, gear is occlusive the problem such as tine of top of occurrence card tine, these need certain professional knowledge, and often need to ravel handled, these had better look for major to repair inn to help.
