[Introduction] The tilt sensor of the four-wheel alignment of the automobile plays an important role. The selection of the tilt sensor is very important in the design and production of the four-wheel aligner. It is an important indicator that determines the accurate measurement of the equipment, product quality and product grade. Basics, what are the major factors to consider when choosing a tilt sensor?
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Select the five parameters of the tilt sensor
The primary parameter for selecting the inclination sensor is accuracy. For today's models, the deviation of the inclination adjustment is generally around 5''. For example, the camber angle of the front wheel of Shanghai Volkswagen PASSAT B5 is -0 ° 35'' to ± 0 °. 25'', so the measurement accuracy of the tilt sensor is required to be within 0.1 degree, and this accuracy can be satisfied in a wide temperature range. Because in China, the four-wheel alignment repair shop is usually in an outdoor or open environment, and it should work normally at minus 20 degrees in the north. This requires the temperature stability of the tilt sensor to be good.
The second consideration for selecting the tilt sensor is the measurement range, which is the measurement range of the sensor. In the four-wheel positioning, most models have angles within ±10°, and individual vehicles have individual angles of ±15°, so the optimal measurement range for tilt sensors for four-wheel positioning is ±15°. Although some four-wheel alignment manufacturers use a larger range of tilt sensor, this is due to the linearity difference of some tilt sensors at full scale. Only a small range of measurements are used in the application, so the output voltage range is small, and the measurement is small. The linearity and accuracy are affected.
The third parameter to consider is the frequency response of the product. In the process of measurement, the device is often moved or adjusted. If the response frequency of the sensor is wide, the reading is difficult to stabilize during the measurement, so the sensor requires a low frequency response.
The fourth parameter to consider is the anti-vibration capability of the product. The tilt sensor is fixed on the mounting base of the four-wheel aligner and then mounted on the wheel of the car through the clamp. When installing, applying or adjusting the wheel angle, it often receives a certain impact, so the anti-vibration performance of the tilt sensor is required.
The fifth parameter to consider is long-term stability. A sensor with good long-term stability is the guarantee that the entire equipment can work stably for a long time. The above five points are the main considerations when selecting the tilt sensor for the four-wheel aligner. They directly determine the quality and grade of the four-wheel aligner.
The importance of tilt sensor in four-wheel alignment
When the car is shipped from the factory, the positioning angles of the four wheels are preset according to the design requirements. These positioning angles are used together to ensure the comfort and safety of the driving of the vehicle. However, after the vehicle has been driving for a period of time, these positioning angles may be caused by the violent bumps caused by the uneven roads (especially when the road surface suddenly encounters uneven roads), the wear of the chassis parts, the replacement of the chassis parts, the replacement of the tires, etc. Variety. Once the positioning angle changes for any reason, it may cause symptoms such as abnormal tire wear, vehicle deviation, decreased safety, increased fuel consumption, accelerated wear of parts, sinking of the steering wheel, and drifting of the vehicle. Therefore, the car must carry out four-wheel alignment maintenance service after driving for a certain period of time or a certain distance. The purpose is to diagnose and correct the deviation of the positioning angle of the wheel by the positioning angle measurement. To achieve an accurate measurement of the angle, the tilt sensor that measures the angle in the four-wheel aligner will play a key role.
Because of the critical role of the tilt sensor, the choice of tilt sensor is very important in the design and production of four-wheel aligners. It is the basis for determining important indicators such as accurate measurement of equipment, product quality and product grade.
Inclinometer SCL1700 designed for four-wheel positioning
The SCL1700 is a tilt gauge designed and manufactured by FTI Finland for automotive four-wheel aligners. It has been selected by more than 50% of the manufacturers of four-wheel aligners in China, and has received good social response and evaluation.
VTI Finland is a pioneer and leader in the design and manufacture of silicon capacitive accelerometers, tilt sensors and pressure sensors. The competitiveness of its products is based on the organic combination of its sensor design and production capacity, motion physical measurement technology and MEMS technology.
The tilt sensor in the SCL1700 is a differential capacitive structure. The sensitive unit is a pair of differential capacitors, so its linearity is high and the accuracy is high. The SCL1700 tilt gauge has built-in temperature compensation and can meet the 0.1 degree accuracy requirement in the temperature range of -20 °C to +70 °C.
The tilt sensor in the SCL1700 is a sealed structure. The sensor is filled with inert gas, which acts as an anti-damping effect and has a low frequency response. And it is a DC response, and the bandwidth is 3HZ.
The tilt sensor in the SCL1700 is a monocrystalline silicon material. The shock resistance of single crystal silicon can be as high as 70,000 g, so the anti-vibration energy of SCL1700 is above 20,000 g. Single crystal silicon does not have plastic deformation, so the product has good repeatability and high long-term stability.
The measuring range of the SCL1700 Inclinometer is ±15°. It has been rigorously calibrated before leaving the factory. The product consistency is good and the interchangeability is strong.
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