Abstract
In order to solve the coupling problem of power in Hydraulic Hybrid City Bus (HHB), a hydraulic hybrid power coupling system based on planetary gear transmission principle is proposed in this paper. The system consists of diesel engine, power coupler, hydraulic pump/motor, etc. The realizable operating modes of power coupling system are analyzed in this paper. Under coordination of clutches, the engine driven mode, hydraulic driven mode, hybrid driven mode, hydraulic engine-start mode and braking energy recovery mode are realizable. Based on Lagrange equation, kinetic analysis and kinematics analyses are presented. In addition, the simulation model of the power coupling system is proposed, which includes diesel engine model, power coupler model, hydraulic pump/motor model, etc. The example simulation analysis is proposed under the hybrid driven mode; the results show that the power coupling system proposed in this paper can realize power coupling of hydraulic hybrid city bus. Compared with traditional city bus, the hydraulic hybrid city bus can choose small-displacement engine so as to improve fuel economy and dynamic property.
Highlights
The hydraulic hybrid utilizes a high pressure accumulator for energy storage which has more superior power density than conventional battery technology
The results show that many operating modes of hybrid bus can be realized by planetary gear transmission system
This paper studies a power coupling system applied to hydraulic hybrid city bus
Summary
The hydraulic hybrid utilizes a high pressure accumulator for energy storage which has more superior power density than conventional battery technology. The power coupling is the key technology of the hydraulic hybrid city bus and the planetary gear transmission mechanism is used most frequently. (2014) Modeling and Simulation of Power Coupling System in Hydraulic Hybrid City Bus. Energy and Power Engineering, 6, 119-132. W. Tsai proposed power coupling system of hybrid bus based on planetary gear transmission, and the lever analogy was used to analyze the speed characteristic and torque characteristic of power coupling system [5] [6]. The results show that many operating modes of hybrid bus can be realized by planetary gear transmission system. A power coupling system of hydraulic hybrid bus is proposed in this paper, based on epicyclical gear transmission. The results show that the power coupling system can solve the power coupling problem of the hydraulic hybrid bus effectively, and the vehicle dynamic property improved obviously under the same fuel consumption
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