Coding magnetic resistance combination type electronic stability program (ESP) absolute type multi-loop angle sensor

Abstract

The invention relates to a sensor, and aims at providing a coding magnetic resistance combination type electronic stability program (ESP) absolute type multi-loop angle sensor which is developed special for an automobile ESP. The angle sensor comprises a gear which rotates along with a steering wheel tubular column, a coding disc with a concentric circle is arranged on the gear, notches of arc section shapes are distributed on the coding disc, a small gear is further meshed with the gear, the small gear further comprises magnets which are distributed in a radial mode, rotation of the small gear can be detected by a magnetic induction angle sensor, and the output range of the small gear is from 0-360 degrees; the small gear is k times as small as the gear in tooth number, four Hall-effect switch chips with magnets are arranged on the circumference of the coding disc at intervals of 30 degrees, when the coding disc rotates 30 degrees, output of the four Hall-effect switch chips changes once, and the four Hall-effect switch chips can be combined with the coding disc to achieve four-digit binary digits formed by 0 and 1 in a single loop to indicate every 30 degrees. According to the coding magnetic resistance combination type ESP absolute type multi-loop angle sensor, a vernier principle is designed in a step-by-step mode, the tolerance range of a product is enlarged, the number of used angle sensing chips is reduced, accuracy of the angle sensors is not reduced, and design cost is reduced at the same time.

Description

technical field [0001] The invention relates to a sensor, in particular, a coded reluctance combined ESP absolute multi-turn angle sensor specially developed for automobile ESP (Electrical Stability Program). Background technique [0002] Angle detection is widely used. For the automotive field, the angle detection is the rotation angle of the steering wheel operated by the driver. Since the rotation of the steering wheel is multi-turn, it is necessary to use multi-turn detection technology. Multi-turn detection can be divided into contact type and non-contact type. The sliding rheostat type is commonly used in the contact type, and the change of the angle changes the resistance value of the sliding rheostat; the non-contact type includes inductive type, photoelectric type, electromagnetic type, etc. The non-contact type is superior to the contact type in terms of accuracy, noise, and service life. Among them, the electromagnetic type has been widely used in recent years bec...

AI Technical Summary

Problems solved by technology

This technical solution is the same as the aforementioned patent, still using two angle sensing chips, but the meshing objects of the gears are changed, so there are also the requirements for gear accuracy and the problem of gear ratio out-of-tolerance

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