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Application of tilt sensors in automotive four-wheel alignment
Car four-wheel alignment
From the structure of the car, the installation of the steering wheels (front wheels), steering knuckles, and front axle has a certain relative position. This installation with a certain relative position is called steering wheel alignment, also known as front wheel alignment. Front wheel alignment includes caster angle, camber angle, toe angle, and front toe. There is also a relative position of installation between the two rear wheels and the rear axle, called rear wheel alignment. Rear wheel alignment includes wheel camber and individual rear wheel toe. Thus, front wheel alignment and rear wheel alignment together are called four-wheel alignment.
When a vehicle leaves the factory, the alignment angles are preset according to design requirements. These alignment angles work together to ensure the comfort and safety of vehicle driving. However, after the vehicle is sold and driven for a period of time, these alignment angles may change due to severe bumps caused by traffic accidents, uneven road surfaces (especially sudden encounters with uneven surfaces at high speeds), wear of chassis parts, replacement of chassis parts, tire changes, and other reasons. Once the alignment angles change for any reason, symptoms such as abnormal tire wear, vehicle drift, decreased safety, increased fuel consumption, accelerated part wear, heavy steering, and vehicle floatiness may occur. Some symptoms can be very dangerous when driving at high speeds.
Four-wheel alignment instrument
The purpose of four-wheel alignment maintenance service is to diagnose and treat the aforementioned discomforts of the vehicle through measuring the alignment angles. Generally, new cars should undergo four-wheel alignment after driving for 3 months, and then every 10,000 kilometers, after changing tires or shock absorbers, and after any collisions.
The instruments currently used for wheel alignment detection are mostly 'four-wheel alignment instruments'. During detection, the four-wheel alignment instrument first measures the current four-wheel alignment parameters of the car, then the computer automatically compares them with the stored values for the corresponding vehicle model, calculating the deviation value for the car's four-wheel alignment. The maintenance personnel can restore the original state according to the prompts from the alignment instrument.
Inclination sensor in the four-wheel alignment instrument
For different four-wheel alignment devices, the key factor is whether the measurement sensors are accurate. Modern cars generally use independent front and rear suspensions, and the main parameters detected by the four-wheel alignment instrument are wheel camber angle, caster angle, camber angle, and toe angle. The four-wheel alignment measurement system measures the above angles, with toe angle generally achieved through a turntable or angle sensor, while other angles typically use inclination sensors. The inclination sensor is fixed on the base plate of the four-wheel alignment instrument and is then mounted on the car's wheels using clamps.
Due to the structure of the car, the measurement of the inclination angles in the car wheel alignment can be divided into direct measurement and indirect measurement. From the definition of wheel inclination angles, it can be seen that the wheel camber angle can be directly measured using an inclination sensor, while the camber angle and caster angle cannot be directly measured due to the installation of the caster on the inner side of the wheel. The measurement range of wheel inclination angles should be around ±15°. For current vehicle models, the adjustment deviation of the inclination angle is generally around 5', for example: the front wheel camber angle value for Shanghai Volkswagen PASSAT B5 is -0° 35' to ±0° 25', so the measurement resolution of the sensor should be less than or equal to 5'.
Inclination sensor LVT526H for four-wheel alignment
Msensor Sensors has recently launched a new inclination measurement sensor for automotive four-wheel alignment instruments, which can be easily embedded into user systems with multiple interfaces.
Main features:
Dual-axis inclination measurement (X-axis and Y-axis)
Reliable measurement range: ±10°, ±15°
Resolution less than 0.01°, accuracy 0.1°
Single PCB board, easy to embed into user circuit systems
Single power supply, digital signal (RS485) output
Built-in temperature sensor (digital SPI output)
Vibration resistance 3500g
Inclination monitoring
X, Y axis, industrial design, small size, low power consumption
Compass heading
X, Y, Z three axis, attitude calculation measurement algorithm
Imu inertial sensor
Three-axis angle, angular velocity, acceleration, magnetic field measurement
Attitude heading reference system
Meet the static, dynamic, high and low temperature of a variety of complex environmental use
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