Shanghai Huace Navigation Technology Ltd

Wending Dai

Kai Chen

Xuefeng Shen

Qiang Ren

Jiejun Wang

Rui Tu

Guangjie Cao

Guangyang Dong

Qiang Yue

Yanping Zhao

Anbang Wang

Xiaohan Gao

Xunye Mao

Wenlong Zhao

A precision calibration method of attitude measuring systems is provided. The precision calibration method of attitude measuring systems includes the following steps: calibrating a zero-deviation, a scale coefficient, and a non-orthogonal angle between axes of an accelerometer to the attitude measuring system via an ellipsoid fitting model (S); compensating original data of the accelerometer using a calculated ellipsoid parameter (S); calibrating an electronic compass via the ellipsoid fitting model according to compensated accelerometer data (S); compensating original electronic compass data by the calculated ellipsoid parameter (S); calculating an attitude according to the compensated data of the accelerometer and compensated data of the electronic compass (S). The above steps of the method have a reliable calibration result and a high precision with a less time consumption of calibration.

Precision calibration method of attitude measuring system

Disclosed is a hydraulic control valve assembly of automatic steering system for agricultural machine including a proportional directional valve (). A balancing valve () is arranged between the proportional directional valve () and the steering cylinder. A first shuttle valve () is arranged between the proportional directional valve () and the balancing valve (). The first shuttle valve () is positioned on one side of the proportional directional valve (). An overflow valve () is positioned on another side of the proportional directional valve (). The overflow valve () is connected to a second shuttle valve () and a logic valve () respectively. The hydraulic control valve assembly has a large control power, a rapid response, and is more suitable for the autonomous navigation operation of agricultural machine. Moreover, the system saves more energy, such that the autonomous navigation operation of agricultural machine is more stable.

Hydraulic control valve assembly of automatic steering system for agricultural machine

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Shanghai, China

Wending Dai