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The automobile display board concentrated the entire vehicle measuring appliance, it
resembled one leaf of window, demonstrated the automobile
The different automobile display board measuring appliance is not same, but the common
automobile conventional measuring appliance has the speedometer, the machine oil pressure
gauge, the water temperature table, and so on.
On the modern automobile, the automobile measuring appliance also needs to install the
constant voltage, specially uses for the stable measuring appliance power source the
voltage, the suppression undulation scope, guarantees the automobile measuring appliance
the accuracy. Moreover, the majority of measuring appliances demonstrate the basis from
the sensor, the basis is monitored the object the change of state changes its
resistance value, indicates through the measuring appliance.
In what the display board is most conspicuous is the speedometer, it expresses the
automobile speed, the unit is km/h (kilometer / hour). The speedometer in fact is composed
by two tables, one is the speedometer, another is the course table.
The traditional speedometer is the mechanical type, the typical mechanical type course
table connects one , inside has one , another end connection to the
transmission gearbox some gear on, the gear revolves the impetus revolves, the
impetus course table covers in the circle together the magnet revolves, covers the circle
and the indicator joint and sets through the gossamer the indicator to the zero position,
the magnet speed causes the magnetic line of force size change, balances is broken
the indicator therefore is led. This kind of speedometer simple is practical, widely uses
in on the size automobile. But, along with the electronic technology development, now the
very many passenger vehicles measuring appliance already used the electronic speedometer,
the common one kind was from the transmission gearbox speed sensor gain signal, caused the
indicator deflection or the demonstration numeral through the pulse frequency change.
The course table is one kind of digital measuring appliance, it meshes through the
counter drum turn of transmission gear and on the speedometer drive shaft, causes the
counter drum turn of rotation, its characteristic is the upper level of drums rotates one
entire circle, the next level of drums rotate 1/10. Same with the speedometer, at present
the course table also has ?? the course table, it from speed sensor gain course signal.
the course table accumulates the course numeral saves in the nonvolatile storage,
condition the data also can preserve under the radio shape.
Another quite conspicuous measuring appliance is . In domestically produced automobile,
before generally is does not establish ??, but nearly ten for several years various types
automobile all emerges installment ??, some merchants also take it the automobile scale
the disposition content. the unit is 1 /min×1000, how many thousand revolutions
namely demonstrates the engine each minute extension. ?? can direct-viewing demonstrate
the engine under each operating mode rotational speed, the pilot may as necessary know the
engine the working condition, coordinates the transmission gearbox files position and the
accelerator position, causes it maintenance best active status, to reduces the oil
consumption, lengthens the engine endurance has the advantage.
?? generally establishes in the display board, with the speedometer symmetrically lays
aside in together. ?? is defers to the magnetic principle work, it receives ?? center
primary ?? when produces the pulse signal, and transforms this signal for the rotational
speed value which may demonstrate. The engine speed is quicker, ?? produces ? are more, in
the table demonstrates the rotational speed value is bigger.
Now the passenger vehicle generally all is ?? ??, has the indicator type and the liquid
crystal digital display type, in the table has the digital integrated circuit, it ?? will
transport the voltage pulse which will come actuates the indicator after the computation
to move or the digital display. Moreover also has one kind ?? is takes out the pulse
signal after the generator delivers ?? the electric circuit explains demonstrates the
rotational speed value, but because of the generator ??? and so on the factor influence,
the value is been not too precise.
The display board hands-on ???, the water temperature table and all is directly with
the engine work related measuring appliance, their each one all will have the
corresponding sensor supervises the object the information reflection on the measuring
appliance.
The machine oil pressure gauge is demonstrates the machine oil pressure the measuring
appliance, the unit is kPa (thousand handkerchiefs). The machine oil pressure gauge sensor
is one kind of pressure anti- sensor, with thread solid company on engine machine oil
pipeline. ??? moves from the machine oil pressure impetus in the resistance, causes the
resistance number change thus to affect to arrives the place through the measuring
appliance ??, actuates the indicator to swing. Because the machine oil pressure has the
certain pressure scope, in order to clear was bright, at present has many automobiles the
machine oil pressure gauges indicates with the indicating lamp, if the engine revolved
time it still shone, the expression engine lubrication system was not possibly normal.
The water temperature table is demonstrates the cooling water temperature the measuring
appliance, the unit is ? (degree Celsius). Its sensor is one kind of thermistor type
sensor, fixes with the thread on the engine cooling canal. The thermistor decided flowed
after the water temperature table coil winding electric current size, thus the actuation
table indicator swung. Before motor car engine cooling water all was acts as with running
water, now the very many motor car engines ?? all use the special refrigerant, therefore
also was called the refrigerant thermometer.
is demonstrates in the fuel tank the oil mass measuring appliance, the unit is L (rises),
the indicator direction " F ", expresses the full oil, the direction " E
", indicates does not have the oil; Also is useful 1/1, 1/2, 0 separately expresses
the full oil, half box of oil and does not have the oil. inside has two coils,
separately in " F " and " E " one side, the sensor is one by the float
altitude control variable resistor, the resistance number change decides two coils the
magnetic line of force strongs and the weaks, also decided the indicator deflection
direction.
The water temperature table and also the useful indicating lamp expresses, the water
temperature indicating lamp bright expression water temperature is high, the fuel oil
indicating lamp bright expression fuel oil near low point, has taken the assistance
reminder.
?? demonstrates between the generator and the accumulator cell sufficient electric
discharge condition, has division ampere meter and the voltmeter. The before automobile
were most is with the ampere meter, it had together the polarized magnet, caused to fix in
the pivot the indicator maintains the middle position, the wired circle surrounded
periphery the pivot, when had the electric current through the coil could induce the
magnetic field, the indicator about swings under the magnetic field function, swings the
direction decides flowed to the electric current after the coil direction. Therefore
ampere meter series between accumulator cell and generator, when generator to battery
charging, the measuring appliance demonstrates (+) extremely, if the accumulator cell is
bigger than the generator to the load discharge capacity the sufficient electric quantity,
then demonstrates negative (-) extremely. Because the ampere meter wiring column
withstanding electric current is quite big, is not too safe, therefore the now automobile
mostly uses the charge indicating lamp or the voltmeter. The charge indicating lamp ground
terminal is controls by the regulator, when the engine not revolves, the sufficient
electric lamp meets the line association passes, the sufficient electric lamp shines; When
the engine revolves, the sufficient electric lamp meets the line is separated, the
sufficient electric lamp extinguishes; If the sufficient electric lamp were still bright
time, explained charge system has breakdown.
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