A new method to measure the instantaneous power output by driving wheels of construction machinery was studied. The rotate speed, torque and angular acceleration of the roll were measured, so the influence of torque imbalance on the measurement aaccuracy was reduced. A AT89S52 SCM was used to measure and analyze the rotate speed and torque signals derived by the JC sensor,then the signals were sent to the computer through RS-232,so the power measure error caused by torque imbalance was decreased. The above work has special reference to the measurement of vehicle dynamical performance and the inspection of diesel vehicles in the load-deceleration states.%研究测量工程机械车轮瞬时功率的一种新方法,对滚筒转速、扭矩以及转角加速度进行测量,降低了力矩不平衡对测量精度的影响；采用AT89S52单片机对JC传感器采集的转速与扭矩脉冲信号进行测量与分析,并通过RS-232送至工控机,减小了力矩不平衡给功率测量带来的误差,对车辆动力性能和柴油车加载减速工况检测有参考价值.
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