关键词：瞬时油耗；瞬时扭矩；载荷谱；测试系统 

Abstract: Currently the engine output torque is not accurately collected in domestic engineering machinery load spectrum tests. This paper proposed the engine instantaneous torque measurement based on the instantaneous fuel consumption and demonstrated the Scientific and rationality of the measurement method, and designed data acquisition system. The system is successfully applied to the load spectrum test of a ZL50 loader. Finally, ZL50 loader load spectrum data were analyzed to compare the effects of different practices on speed, power, fuel consumption and other parameters.

Key words：Transient Fuel; Transient Torque; Load Spectrum; Test System