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Vehicle Wiper Angle Measuring Instrument
1 Function and accuracy requirements:
a) Able to measure the rotation angle of the left and right wiper output shafts (mainly measuring the angle of the wiper output shaft relative to the reset position at the starting position and limit position of the wiper, as shown in Figure 1), with the rotation plane inclined to the horizontal plane.
b) The maximum wiper rotation speed is 132 cycles/minute, and the angle display speed must be fast enough to ensure that the minimum and maximum angles of a single cycle can be read, or to record and display the minimum and maximum angles over a period of time. All data is displayed on a computer and can be printed.
c) Angle measurement range of 90° (can be measured clockwise and counterclockwise), measurement accuracy ±0.1°.
Figure 1 Schematic of wiper blade angle
2 Installation interface:
The installation position of the angle measuring instrument is shown in Figure 2, located at the connection between the wiper arm and the motor output shaft. The screws and washers at the connection can be removed for the installation of the angle measuring instrument, as shown in Figure 3.
Figure 2 Schematic diagram of the installation position of the angle measuring instrument
Figure 3 Schematic diagram of the wiper output shaft and arm installation
Figure 4 MK245B angle sensor miniature size diagram
The MK245B micro series angle sensor integrates MEMS technology, is small in size, and has low power consumption; it uses magnetic induction technology, employing differential array magnetic sensitive elements and non-contact angle measurement methods. It measures the rotation axis by sensing the parallel magnetic field strength of a permanent magnet installed at one end of the rotation axis. Through MCU processing, it achieves linearity correction, temperature compensation, output signal standardization, digital filtering, zero setting, and programmable intelligent control with different slope settings, realizing the output of the sensor's absolute angle position within the range of 0 to 360°. Accuracy is 0.3°, with multiple output options including RS232, RS485, RS422, CAN, 0-5V, 0.5-4.5V, 0-10V, 4-20mA, and 0-20mA.
All products are calibrated before leaving the factory, protected against reverse and pulse peak voltage, and undergo long-term aging stability tests. Each process is precise and rigorous, using high-quality bearings to ensure reliability under different working conditions and long-term use cycles; it features contactless operation, long lifespan, high resolution, low temperature drift, excellent linearity, precise reset, high frequency response, multiple protections, anti-interference, vibration and impact resistance, suitable for various harsh industrial environments such as water, oil, and gas, making it a cost-effective angle sensor. It is also an ideal product for upgrading contact-type angle sensors (such as conductive plastic potentiometers, encoders, and angular displacement sensors).
Figure 5 Schematic diagram of wiper operation
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