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针对在心肺功能评估和训练中由于蹬踏速率波动导致运动负荷(功率)无法维持恒定的问题,设计了一种新型磁阻发生装置,实时、快速、精确地调节阻力,通过模糊PID控制实现了一定范围内不受蹬踏速率影响的恒功率控制。为验证恒功率控制效果,在改进后的心肺功能评估训练系统和Monark心肺功能评估训练系统上分别进行了恒功率实验,测试结果表明:对于改进后的系统,蹬踏速率在50-70r/min变化时,实时功率曲线控制在目标功率曲线±8W内上下波动,2min内整体平均功率与目标功率误差小于2W,系统克服了由于蹬踏速率改变而导致人体输出功率无法恒定的影响。相比Monark系统,在相同目标功率及相同蹬踏速率变化条件下,改进后的系统在恒功率控制精度上整体提升了2W,同时降低了控制误差。
Aiming at the problem that the exercise load (power) can not be kept constant due to the fluctuation of pedaling rate during cardiopulmonary function assessment and training, a new type of magnetoresistive device is designed to adjust the resistance in real time, quickly and accurately. The fuzzy PID control Constant power control that is independent of pedaling rate within a certain range. In order to verify the effect of constant power control, constant power experiments were carried out on improved cardiopulmonary function assessment training system and Monark cardiopulmonary function assessment training system respectively. The test results show that for the improved system, the pedaling rate is 50-70 r / min During the change, the real-time power curve control fluctuates within ± 8W of the target power curve, and the overall average power and the target power error are less than 2W within 2min. The system overcomes the problem that the human output power can not be constant due to the change of the pedaling rate. Compared with the Monark system, under the condition of the same target power and the same pedaling rate, the improved system improves the overall power control accuracy by 2W and reduces the control error.