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At present, researchers in the field of automotive testing have little knowledge of advanced electronics, lasers, infrared and computer technologies, and researchers in this area have insufficient knowledge of automotive testing theory. With the expansion of the scale of four-wheel locator manufacturers, there are More professionals in various fields are collaborating and improving the accuracy of the sensors. There are fewer domestic automation equipment that can be widely used and have higher accuracy. Many axle manufacturers are assembled in China by purchasing foreign sensors and software. Failure to form its own intellectual property rights has resulted in uneven quality of axle products. Because the positioning parameters of the steering wheel of the front axle are concentrated, the tilt angle of the kingpin is in a general space position, and there is no measurement reference. Therefore, it can only be measured indirectly through the geometric model, which will produce theoretical errors. For a long time, the lack of inspection devices in the production and use of the four-wheel locator for comprehensive and effective verification has led to the inaccuracy of the four-wheel locator, which is the main reason for the quality of the existing four-wheel locator to be out of control. At present, there are mainly the following two types of wheel positioning detection equipment used at home and abroad:
1.Wheel positioning static inspection equipment Wheel positioning static inspection refers to the geometric angle measurement of the wheel positioning when the car is stopped or nearly stopped. The main items of static detection of wheel positioning are: front and rear axle wheel toe, front and rear axle wheel camber, kingpin inclination, kingpin backward inclination, steering front opening angle, thrust angle, etc. According to the detection principle and method, the detection equipment currently used includes leveling front wheel locator, mirror reflection type, electronic wire drawing type, laser type, infrared type, and image recognition type four wheel locator.
2. Wheel positioning dynamic detection equipment Wheel positioning dynamic detection mainly uses the flat side sliding table to detect the combined effect of wheel toe and camber, and diagnoses the main factors that cause side slip. When the wheel rolls over the side skid slide, the slide moves inward or outward, and the displacement sensor or force sensor is used to detect the amount of side slip and the side slip force, thereby reflecting the cooperation of the toe and camber. Before the 1980s, most of the sliding tables used in China relied on imports from abroad. Later, with the efforts of Chinese scientists and technicians, the sliding table was independently developed. And from the original pointer type development to today's digital display, printing, digital communication interface slide test bench. The intelligent side-slip test bench developed by the original Jilin University of Technology can not only be connected with two plates but also can be separated with a single plate. With a diagnostic function, you can point out the main cause of side slip.
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