| The most governments and automobile manufacturers in the world are tryinghard to seeking impactful methods, nowadays, to save energy and decrease emissionof the engine. Because of the extortionate developing and manufacturing cost andapplication performances limits of Electric Vehicle, the Hybrid-Electric Vehicle (HEV)has been taken as one of the best ways to carry out the idea of energy-saving andemission-decreasing. After analyzing the existing energy saving technologies of HEV,the fresh thought of research on HEV exhaust energy recycling&assistant system（shorten as “HEV exhaust energy recycling system” in next）will have been putforward in this dissertation. The main contents of this paper are delivered asfollowings.①The analyzing results of engine thermal-balance character prove that therecycling vacuum of the automobile engine exhaust energy is very large. The existingengine exhaust energy generator technology at the home and abroad is researched, andit is ensured that the exhaust-turbine generator technic, with high energy recyclingefficiency, is the best of all.②According on the engine energy calculation theories in ideal-cycle andpractical-cycle and the P-n sketch map and power characters curve of the Gasolineengine LJ491QE. It can be worked out, that the exhaust gas energy is almost30.91%～66.92%of all the energy released by per mass gasoline. From a quantitativeperspective, that illuminates that the idea of recycling the engine exhaust energy isfeasible.③Based on the basic principles and numeration theories of hydrokinetics andengineering thermodynamics, mostly factors (such as, structure and inner surfaceroughness of the vent-pipe, are, Excess air coefficient, exhaust mass flow rate,exhaust constant, exhaust pressure and temperature, and exhaust flow velocity), whichare related with the exhaust energy lost while it flowing from engine to turbine inlet,are analyzed and researched comprehensively. Calculation results dedicate that, tounits mass fuel, the exhaust energy lost in its flowing process almost takes6.88%～11.61%of all energy in exhaust. Additionally, Many effective measures are advancedbased the basic calculation theories in this paper too.④Onthebasisoftheexhaustenergyalterationruleasmentionedaboveandtheturbine operation theory, the turbine used in GT3040(82mm) is chosen to be which equips in HEV exhaust energy recycling system. Besides, Some good methods arebrought forward to optimize its running efficiency.Planetary gear transmission system is chosen as the system working at high speedbetween the Turbine and Generator, for its high-transmission-ratio and largeoperation-speed-range. And then2K-H style in series is ensured to be transmissionscheme in this system, so that its transmission ratio and efficiency be as high aspossible.High-speed permanent magnet brushless DC generator is able to achieve theelectromechanical energy conversion task in HEV exhaust energy recycling systemaccording to the design results of turbine and planetary gear transmission systemmentioned above.90K5CWY is chosen to be the generator after referring relativetechnical specifications. And then its performances are optimized by some certainmethods in next to advance the generating efficiency.⑤HEV exhaust energy recycling system is simulated, employing practical testresults of LJ481QE, by MATLAB. And the simulation results show that the totalenergy recycling efficiency of HEV exhaust energy recycling system is more than70%. There is2.3808kW～6.1308kW in all energy(12.222kW) of each unit of fuel,which could be recycled and translated as electricity. Therefore, from the viewpointsof energy quality and quantity, it is reliable to equip the HEV exhaust energyrecycling system to recycle exhaust energy. |
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