Research On The Configuration Design Of Parallel Hybrid Transmission System Based On Mechanical Innovation Method

With the rapid development of hybrid electric vehicles,the configurations of HEV have become the focus of the major automotive enterprises.however,due to the patent blockade of foreign companies,the development of the innovation configurations of the domestic hybrid electric vehicles are serious restricted.At present,most of the new configurations are derived from the tranditional automatic transmission.However,many configurations have not been analyzed in detail,the recursive methods are also lack of theoretical support,and the transmission systems lack overall evaluation.The transmission of single-motor parallel hybrid electric vehicles was used for research,and the mechanical innovative design method was used to design configurations.With translating topological structure and focusing on the design process,128 feasible potential parallel hybrid configurations were extended.One feasible potential parallel hybrid configuration was randomly selected for the next analysis of operation model.Based on force balance analysis,the torque distribution relationship in each mode was calculated,the model was established and simulation analysis was performed to evaluate the rationality of the selected configuration,the theoretical basis was provided for developing more potential configurations by using mechanical innovative methods.The main research contents as follows:(1)The present situation of hybrid electric vehicle configurations at home and abroad were analyzed,and the limitation of domestic hybrid electric vehicle configurations was summarized,the necessity of research on the configurations of hybrid electric vehicle was elaborated.(2)The topology and operation modes of the existing parallel hybrid electric vehicle were analyzed with the single-motor parallel hybrid electric vehicle used for the research object,the topological structure characteristics of the single-motor parallel hybrid vehicle were obtained after detailed comparison.(3)The kinematic chains of mechanical topology structure were obtained through adopting the mechanical innovative design method and general rules,and the generalized kinematic chains were acquired according to the members of links and joints.The feasible and specific kinematic chain map meeting with design constraints was found from the generalized kinematic chains by the specific program.12 feasible and specific kinematic chains were generated by eliminating the isomorphism types,and those chains were converted into corresponding schematic diagram through particularization rules.(4)According to the energy distribution structure and the constraints of power input and output,the power of the mechanism diagram of the planetary gear trains was distributed,and the engine、motor and output were reasonably placed.Then according to the requirements of each mode of operation,the clutch and brake were reasonably placed,finally 128 feasible potential configurations which satisfied various conditions were obtained.(5)A specific new configuration was selected for specific analysis.the mathematical relationship of the power input and ouput was built,and the torque distribution relationship in each mode was calculated,then the off-line simulation was performed to verify the feasibility of the selected feasible new configuration.