针对压裂车大功率、高油耗等特点，对采用多台发动机的全液压压裂车进行功率节能匹配优化；根据负载变化规律，采用中位数法识别负载工况；基于发动机样本和液压泵效率台架试验，采用多项式拟合算法分别建立发动机比油耗和液压泵效率模型，找到发动机油耗经济区和液压泵高效区；使用自适应惩罚函数法建立综合油耗目标函数，在各负载工况下，基于遗传算法优化输出最佳发动机转速和液压泵排量比组合，使发动机比油耗较低、液压泵效率较高，实现综合油耗最低. 结果表明，当压裂车工作压力为40?70 MPa时，新方案与原方案相比，综合节油率达30.92%?0.05%，平均节油率为6.92%?4.20%，具有较好的节油效果.

Aimed at fracturing truck’s characteristics of high power and consumption of fuel, optimization of power matching on energy-saving for the hydraulic-driven fracturing truck which has more than one engine was done. According to the rules of load, the median method was proposed to identify the load. Based on the specific fuel consumption of engine and the pump efficiency test data, the power matching method of lowest consumption of fuel was put forward. According to the engine sample data and pump efficiency test data, the specific fuel consumption model of engine and the efficiency model of pump were built based on the polynomial fitting algorithm. And economic areas of engine and the high efficiency area of pump were obtained. Objective function of practical fuel consumption was built based on the adaptive penalty function method. Under the circumstances of different load conditions and based on the genetic algorithm, the best combinations of engine speed and pump displacement ratio can be output to realize lower specific fuel consumption, higher pump efficiency and the lowest practical fuel consumption. And the results show that when the range of fracturing truck pressure is 40~70 MPa, the rate of saving for the practical fuel consumption is 30.92%~0.05%, and the average is 6.92%~4.20%. The new method has better fuel saving effect than the old one.