No abstract

A method to establish duty cycle was proposed based on wheel loader operating characteristics and features. Firstly, wheel loader operating characteristics, energy consumption and power distribution rules were summarized theoretically. Wheel loader energy consumption rules were explored through operating test. The features were extracted from testing data which can represent wheel loader operating rules. Finally, the duty cycle was composed according to the rules features arose in the actual operating test. The duty cycle will provide support for data files for hybrid wheel loader power system matching, computer simulation and dynamic analysis. Furthermore, the duty cycle will be helpful for traditional wheel loader dynamic matching, simulation analysis and numerical optimization.

Based on the characteristics of high fluctuation and periodicity of output power during working process of wheel loader, hybrid drive technology can provide a solution for fuel saving and fuel reduction of wheel loader through power adjustment function and energy recycle feature. Aiming at power output motion of wheel loader duty cycle, 7 means for hybrid wheel loader to save fuel have been proposed; contribution to save fuel and easiness to realize the goal under current technical conditions of each means has also been assessed. It is considered that there are two categories of wheel loader energy saving technology: one is to increase fuel utilization rate, and the other is improve transmission efficiency of torque converter. However, realizing one of these two aspects can not save fuel ideally; improvement in both aspects will bring satisfactory energy materials saving effects.