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vss to mechanical speedometer
The utility model relates to a mechanical speed sensor（Vss), which belongs to the field of auto parts The oil seal and the shaft sleeve I are respectively sleeved on the output shaft assembly, which is connected with the upper housing and clamped by the output shaft snap ring; The shaft sleeve II is connected with the intermediate shaft assembly in a complete set, and the intermediate shaft assembly is connected with the lower housing and clamped through the intermediate shaft snap ring; The upper and lower shells are positioned by locating pins and connected by hexagon socket bolts The utility model has the advantages of simple structure, low cost and reduced product launch cycle The utility model has the advantages of convenient disassembly and easy maintenance, and is suitable for the needs of mass production The output signal after two-stage gear deceleration can ensure the normal application of the whole vehicle, with simple adjustment and strong applicability. It can be applied to a variety of gearboxes The signal is accurate and durable
The first thing to be clear is line B. for the vehicle speed sensor, line B is output and directly connected to the vehicle speed signal pin of the instrument; Line a is a positive 12V power supply. In fact, this power supply is output internally by the instrument (24V system). Of course, it is also provided by the whole vehicle (12V system); this power supply provides power for the sensor.
Line C is the grounding wire, that is, the ground wire; As for the voltage of line B you mentioned, you need to understand the working principle of the speed sensor. It also has a conditioning circuit inside. Square wave pulse is generated through the rotation of the crankshaft. Of course, there is voltage on line B measured by a multimeter.The output signal of the vehicle speed sensor can be a magnetoelectric AC signal, a hall type digital signal or a photoelectric digital signal. The vehicle speed sensor is usually installed in the drive axle housing or transmission housing, and the signal line of the vehicle speed sensor is usually installed in the shielded jacket, This is to eliminate electromagnetic and radio frequency interference generated by high-voltage live wire, car phone or other electronic equipment.It is used to ensure no interruption of electronic communication and prevent poor driving performance or other problems. Magnetoelectric and photoelectric sensors are the two most widely used speed sensors in vehicles. Magnetoelectric sensors are widely used in various vehicles in Europe, North America and Asia to control vehicle speed (VSS), crankshaft angle (CKP) and camshaft angle (CMP), At the same time, it can also be used to feel the speed and position signals of other rotating parts, such as compressor clutch, etc.
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