Abstract
Based on the manual transmission of a micro car, this paper would present the analysis of the factors affecting the transmission efficiency (TE) and the calculation formula of TE. Accordingly, the calculation model of Matlab/Simulink TE would be built to figure out how TE varies with input torque. Meanwhile, a set of manual transmission test bench would be designed and used to verify the theoretical simulation results. It adopts a common DC bus energy feedback closed system which can feedback the power generated by the load motor to the grid through the DC bus so as to save the electricity and produce less pollution. Therefore, while the test bench can reflect the variation trend of TE about the manual transmission truly, it is comparatively reliable. Apart from being energy-saving, its unique versatility could definitely predict its exceptional potential. The data of TE obtained from the test bench are compared with the simulation result. It showed that the TE of bench test and simulation result are similar, though companied by less than 2% error difference which is within the allowable range. Most importantly, the bench test results proved the validity of the theoretical analysis statistically, which is of great necessity and significance to the research of TE.
Highlights
The increasing of transmission efficiency (TE) can reduce the fuel consumption of automobile directly so as to improve its dynamic performance
The main reason causing rolling friction power loss is that the film pressure of lubricating oil is in irregular state and uneven
According to the empirical formula proposed by Palmgren, the total friction torque can be divided into the torque caused by the external load and the torque caused by the friction of the lubricant
Summary
The increasing of TE can reduce the fuel consumption of automobile directly so as to improve its dynamic performance. Kolivand proposes a new TE model of spiral bevel and hypoid gear, the model combines a computationally efficient contact surface model and a mixed traction model by elastic hydrodynamic lubrication (EHL) to predict power losses of transmission. The effect of the surface contact pressure, contact radius, oil temperature and surface roughness on the loss of gear friction power was researched in this paper [1]. Lizhi of Jilin University studied a transmission testbench of electric driven closed system for performance test analysis and research of a heavy commercial vehicle transmission. It has high precision, simple structure, low cost and high automation. The test bench is able to meet basic testing requirements of transmission [6]
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