Auto Meter Review

Car dashboard instrument focused on the entire vehicle, it seems to have a window, showing the car's working conditions.
Different car dashboard instrument vary, but generally the car with conventional instrumentation speedometer, tachometer, oil pressure gauge, water temperature, fuel gauge, charging table and so on.
Hyundai, the car dashboard device also requires regulators, instruments designed to stabilize power supply voltage fluctuation suppression, in order to ensure auto meter accuracy. In addition, the basis for most instrument display from sensors, sensing devices to be monitored based on changes in the state of the object to change its resistance value, expressed through the instrument out.
Dashboard of the most prominent is the speedometer, which indicates the car speed, the unit is km / h (km / h). Speedometer is actually composed of two tables, one is the speedometer, the other is the odometer.
The traditional speedometer is mechanical, the typical connection a mechanical odometer shaft, flexible shaft has a steel cable, connect the other end of shaft to the transmission one gear, rotating gear driven rotary wire rope, wire rope odometer drive a magnet rotating circle cover, cover rings connected by springs with a pointer to the pointer over the zero position, rotation speed of the magnet field lines caused by changes in the size, balance is broken pointer so it is driven. This speedometer is simple and practical, is widely used in large and small vehicles. However, with the development of electronic technology, many cars have electronic speedometer instrument, from the common one is to get the speed sensor on the transmission signal, the pulse frequency changes through the deflection of the pointer or digital display.
Odometer is a digital instrument, it is the drum through the counter and speedometer drive gear on the worm gear shaft, so that the counter rotating drum, which is characterized by a full rotation on a drum circle, the next level of drum rotation 1 / 10 laps. Like with speedometer, odometer now has electronic odometer, mileage to get it from the speed sensor signal. Electronic digital odometer mileage accumulated in non-volatile memory storage, in the absence of state power under the state data can be saved.
Another more prominent instrument is the tachometer. China-made cars in the past generally do not set the tachometer, but the last decade the rise of various types of cars installed tachometer, some manufacturers will grade it as a vehicle configuration content. Tachometer unit is 1 / min × 1000, which shows how much one thousand revolutions per minute the engine turn. Tachometer that shows the engine speed in all conditions, the driver can always know the functioning of the engine, with transmission gear and throttle position, so that it remains the best working condition, to reduce fuel consumption, longer engine life with benefits.
Speed ??tables are normally set in the dashboard, the speedometer placed symmetrically with together. Magnetic tachometer in accordance with the principles of work, it receives the ignition coil primary current pulse generated when the interrupt signal, and converts this signal can be displayed speed value. The faster the engine speed, ignition coil the more the number of pulses, the table shows the speed the greater the value.
Now cars are generally electronic tachometer, LCD digital display and a pointer type, the table with digital integrated circuits, it's shipped from the ignition coil voltage pulse has been calculated after the drive pointer or digital display. In addition there is a speed table is removed from the pulse signal generator circuit to explain to the tachometer speed value after the show, but due to the alternator belt slippage and other factors, the value is not accurate.
Dashboard oil pressure gauge, water temperature and fuel gauge and engine are directly work-related instruments, they each have a corresponding object sensor will monitor the information reflected in the instrument.
Oil pressure gauge oil pressure is to show the instrument, the unit is kPa (kPa). Oil pressure gauge sensor is a piezoresistive sensor, with a threaded solid even in the engine oil pipeline. By the oil pressure to promote the contact pads in the resistance movement, the resistance changes which affect the amount of current through the meter into the ground, drive the pointer swing. As the oil pressure has a certain pressure range, the sake of clarity, there are many vehicles with oil pressure gauge indicator that, if the engine is running, it is still lit, it indicates the engine lubrication system may not be normal.
Water table is to show the cooling water temperature meter, the unit is ℃ (Celsius). Its sensor is a thermistor type sensor, with a screw fixed on the engine cooling water. Thermistor determines the flow through the coil winding of the current water table size, header pointer swing to drive. Car before the engine cooling water is tap water to act as, a lot of automotive engine cooling system with a special coolant, also known as the coolant temperature gauge.
Fuel gauge is displayed inside the fuel tank meter, the unit is L (liters), pointing to the "F", said the full oil, point to "E", said oil; also useful for 1 / 1, 1 / 2, 0 respectively. that full oil, half tank of fuel and oil. Fuel table has two coils, respectively, in "F" and "E" side of the sensor is a highly controlled by the float variable resistor, the resistance change of magnetic field lines determine the strength of two coils, it determines the pointer deflection direction.
Water table and the fuel gauge is also useful indicator that the water temperature indicator light, said high temperature fuel almost low fuel indicator light, as a supplementary reminder.
Table shows the generator and rechargeable battery charge and discharge between the state, divided ammeter and voltmeter. Most of the previous car ammeter, it has a permanent magnet, so that the pointer on a fixed pivot point to keep in the middle, surrounded by a coil around the pivot point, when a current is induced by the coil when the magnetic field, the pointer swings in the magnetic field around , decided to swing in the direction of current flowing through the coil direction. So ammeter connected in series between the battery and generator, when the generator to recharge the battery, the meter shows the positive (+) pole to the load if the battery charge and discharge is greater than the amount of the generator, then shows a negative (-) pole. As the ammeter terminal to withstand relatively large current, less secure, so now use the car most of the charge indicator or voltmeter. Charging indicator light ground terminal is controlled by the regulator when the engine is not running, the charging light grounding line Unicom, charging lights up; when the engine is running, the charging light grounding line is disconnected, the charge light goes out; if the charging light remains on, indicating charging system failure.