Study On Key Technologies Of The Hydraulic Hybrid Vehicle With Electronic Control

Vehicles is a main member of the energy consumption and emissions, sustainable development of transportation and society and economy has become a global concern. Therefore, saving energy has become a global hot issues for all classes of vehicles, in the national and international both is researched and developed the new powertrain to improve the fuel economy and power performance of vehicles, to reduce energy consumption and air pollution, protect the environment. Saving energy is not only a major issue of national economy, also modern science and technology faced the serious challenges. Saving energy broadly include recycling and reuse. Exploring and studying in the energy recycling and reuse technology of vehicles operation reflects scientific thinking of use energy.In this paper, the study is a power source for a new type of the hydraulic drive vehicle with electronic control, make use of theoretical analysis, simulation and experiment to carry out by means of a systematic and deeply research. The new vehicle with electronic control and hydrostatic drive with secondary adjusting technology, the power source can operate independently in the economic zone, as the energy storage element to join, recyclable and reused braking energy.Based on the analysis of the operation characteristics of power sources, the hydraulic accumulator for energy storage element characteristics were studied and has established the model of the pump efficiency, the use of system identification and parameter estimation methods, is set up the polynomial fitting equation of a theoretical calculation pump efficiency, and the total efficiency of the power source system is put up to as performance evaluation.Through the matching has been analyzed and researched between system components of the power source, the use of theoretical calculations and simulation analysis to establish the selection principle of the relevant components of the key technical parameters, and emissions and the best fuel economy is a targets for the basic parameters for the matching optimization. The state of charge (SOC) of the accumulator is defined, and on this basis the performance of the power source is analyzed in use of global optimization of energy management strategy and instantaneous equivalent onsumption minimization strategy.By analyzing typical operation mode for vehicle, aim the different characteristics and requirements of the engine and hydraulic pump, the paper introduces the fuzzy control and fuzzy adaptive control strategy to design controller to simulation and its experimental study. In considering conditions of the characteristics of the engine and pump, discussed the regulation characteristics of the power source system how to affect the power performance and economy of vehicle, and based on to ensure the power performance of vehicle, how to achieve the best economy of the vehicle ways and means.In order to study dynamic performance and its control law of a new electronic control hydraulic drive vehicle and power source, developed "a prototype." Completed power source design, calculation and selection of the mechanical-electric-hydraulic and other components and prototype testing.Combination of control instruments and self-developed controller, the power source is simulated and real-time control. Verified by simulation on the one hand the system simulation model and the correctness of the control strategy; the other hand, explores the power source system control law and for the engineering design of the new electronic control hydraulic drive vehicle provides a method of power source and the theoretical basis for the control.