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auto meter electronic speedometer
Composition of electronic speedometer Electronic speedometer consists of speed sensor, signal processing circuit, speedometer and odometer. Operating principle of electronic speedometer The speedometer sensor is installed in the combination instrument and driven by the transmission through the flexible shaft. When the car is moving, it will produce a signal proportional to the speed. It consists of a reed switch with one or more pairs of contacts and a rotor. The signal processing circuit consists of monostable trigger circuit, constant current circuit, 64 frequency division circuit, power amplifier circuit and power supply voltage stabilizing circuit. When a car is driving, it converts the pulse signal input by the speed sensor into a current signal after shaping, and drives the speedometer to indicate the speed after amplification; At the same time, it also converts the pulse signal into a pulse signal of a certain frequency through frequency division and power amplification, so as to drive the shaft of the odometer stepping motor to rotate and record the mileage of the vehicle.
The speedometer uses a magnetoelectric ammeter as an indicator. When the vehicle is running at different speeds, the signal processing circuit converts the pulse signal input by the speed sensor into a current signal proportional to the vehicle speed, which deflects the pointer of the ammeter to indicate the corresponding vehicle speed. Odometer Odometer consists of stepping motor, six digit decimal counter and internal transmission gear. When the vehicle is running, the pulse signal output by the speed sensor is converted into a pulse signal of a certain frequency after frequency division and power amplification of the signal processing circuit, which acts on the solenoid coil of the stepping motor. The stepping motor converts this pulse signal into an angular displacement signal to make the motor shaft rotate, drive the six counting wheels of the odometer decimal counter to rotate in turn, and record the total mileage and one-way mileage of the vehicle. When the short distance mileage needs to be eliminated, just press the reset lever, and the short distance odometer will return to zero
The signal processing circuit is composed of monostable trigger circuit, constant current circuit, 64 frequency division circuit, power amplifier circuit, power supply regulator and other electronic circuits. When the car is running, it will shape and process the pulse signal input by the speed sensor into a current signal and amplify it to drive the speedometer to indicate the speed; At the same time, it also converts the pulse signal into a pulse signal of a certain frequency through frequency division and power amplification to drive the shaft of the odometer stepping motor to rotate and record the driving mileage of the vehicle.
The speedometer uses a magnetoelectric ammeter as the indicator. When the vehicle runs at different speeds, the signal processing circuit converts the pulse signal input by the speed sensor into a current signal proportional to the vehicle speed, deflecting the pointer of the ammeter to indicate the corresponding vehicle speed.
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