Electronic differential system of electric self-propelled aerial work platform [Popular Science]
2015-09-15 11:18
Self-propelled aerial work platforms require operation in confined spaces, and turning radius is an important performance indicator. To achieve a small turning radius, the aerial work platform's structure allows for a 90° steering angle. During turning, the four wheels of the aerial work platform perform circular motion around a point on the line connecting the rear wheel centers. Self-propelled aerial work platforms use an independent drive mode. Under the condition that the given speeds of each traveling motor are the same, except for the motor with the largest turning radius, other motors are in a stalled state to varying degrees, especially the four-wheel drive platform. When the steering angle is 90°, the inner rear wheel's turning radius is 0°, and the motor is completely stalled. The current flowing through the motor is entirely converted into heat, easily leading to motor damage.
According to actual tests of the GTZZ electric articulated boom aerial work platform, during straight-line travel, the operating current of the four motors is around 20A, with little difference between the motors' currents. During turning, as the steering angle changes from 0° to 90°, the current of the inner rear wheel motor increases to 180A, the current of the front motor does not increase significantly, and the current of the outer rear motor increases significantly. Currently, self-propelled aerial work platforms sold on the market do not have an electronic differential system; they only have motor overcurrent protection in hardware or software to simply prevent the motor from burning out due to prolonged overcurrent.
The maximum travel speed of self-propelled aerial work platforms is generally very low. Although the risk of skidding during high-speed travel, like in electric vehicle platforms, does not occur, electronic differential control for aerial work platforms is still very important. The electronic differential control system can achieve optimal motor control based on the steering angle and motor state feedback, which not only effectively improves the platform's travel performance, especially turning and climbing performance, and protects the traveling motor, but also effectively saves energy, allowing the aerial work platform to operate for a longer time on a single charge.
Currently, several large manufacturers of self-propelled aerial work platforms in China mostly rely on foreign suppliers for the control systems used in their equipment. Due to the high safety requirements for aerial work platforms, domestic companies are unwilling to spend a lot of financial resources and time developing a reliable control system. Yunxiang Heavy Industry, a company that has always focused on R&D, uses self-developed systems in its electric self-propelled aerial work platforms.
During the construction of the Wuhan Botanical Garden Expo Park, aerial work platforms were used extensively in construction, leading to their gradual acceptance by Chinese users. In the past two years, aerial work platforms have been widely used in the Yangtze River Delta region, and the application prospects of aerial work platforms in China are very bright. Therefore, researching and developing a reliable, easy-to-maintain, and inexpensive electric aerial work platform control system, like Yunxiang Heavy Industry, is very important for the development of China's aerial work platform industry.
After Yunxiang's research, design, and experiments, customers have recognized Yunxiang's electric self-propelled aerial work platform control system. The control system for self-propelled electric aerial work platforms is not only relatively complex in structure and involves many aspects but also has high control performance requirements. With the intensifying domestic competition and the further reduction of aerial work platform costs, more and more companies will attach importance to system R&D.
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