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1 Composing and Function of Control Part
In electrical system of motorcycle,control part is to ensure the good working condition of power supply
part and power consumption part,and ensure their harmony.It can make rider control the electrical system
momentarily.
Control part mainly consists of adjuster,rectifier,flash relay,starting relay,fuse tube,control switch and
cable assembly.
(1)Adjuster
Adjuster is the important component of power supply part of motorcycle electrical system.It can be
divided into DC generator adjuster and AC generator adjuster according to the engine type.
[1]DC generator adjuster
Because the voltage export of DC generator adjuster and the rev has direct proportion,it will bring some
problems:[A]When motorcycle runs with high speed,the engine rev is very fast and the voltage export of
DC generator is very high,which will easily make the electro-equipment burn out and make the storage
battery over charge.[B]When motorcycle runs with low speed,the engine rev is very low,which makes
storage battery export power to DC generator with strong electric current so that the DC generator is burned
out.So it is necessary to make adjuster cooperate with generator.
[2]AC generator adjuster
The motorcycle with generator not only needs the rectifier to transfer the AC to DC,but also it needs
AC adjuster to stabilize the export of generator.At present,the AC adjuster which is usually used is AC
electronic adjuster.
AC adjuster mainly consists of transistor,diode and thyristor.When generator works,the lighting and
signal coil will produce AC.
(2)Rectifier
Rectifier is normally divided into two types:single-phase half wave rectifier and full-wave bridge
rectifier.These two rectifiers work as the principle of one-way electric character of silicon diode.It is like an
electronic valve,which only allows one side electric current to go through.
(3)Flash Relay
Flash relay is called flasher.It is mainly divided into three types:thermal resistance,capacitance and
transistor.
(4)Starting Relay
When starting electromotor works,the electric current will be very strong.It can reach tens of amp.
Starting relay is an electromagnetic switch.When pressing the starting switch of right handlebar,electric
current will connect with the cathode of battery through storage battery,battery connection,relay coil and
connection of starting switch,then it will make a closed circuit.
(5)Tube
Generally, fuse is composed of plastic fuse boxes fitted up with the fuse tube.
(6)Control Switch
The control switches of electrical system are centralized on the left and right handlebar.Normally,from
up to down,there are switches of high/low beam light,turning light and horn on the left handlebar.Also,from
up to down,there are switches of position light,headlight and electric starter on the right handlebar.The
general electrical switch is in the middle of handlebar.
(7)Main Cable
Each part of electrical system of motorcycle is connected by lead.In order to avoid leads in a mess
and be propitious to arrange on the frame,leads with the same direction are usually bound by insulative
rubberized fabric.This is cable assembly.
Joint of voltage-
adjusting relay
Section 3 Control Part
2 Disassembly and Maintenance of Control Part
[1]Measure the voltage expor t of relay with
multimeter and check whether it is within 13.0V
～14.0V.Replace the voltage -adjusting relay when
the voltage export is lower than 13.0V.
CAUTION
Replace the rectifier when the cooling fins of it
are broken.
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