Research On Powertrain Matching In Consider Of The Influence On Comfort

The automotive industry has become a pillar industry of our national economy, howeffective solution to energy saving, emission reduction and environmental issues is the keyto promote the sustainable development of the automotive industry. The car’s power，economy, emissions and comfort largely automotive powertrain reasonable match. Match forautomotive powertrain research, domestic and abroad around the driveline to match vehiclepower, economy and emissions impact study, and achieved good results.For some domestic models, when the car driving to a certain speed range, the autobody vibration intense body vibration significantly reduced when the speed exceeds thespeed range phenomenon. From Improve vehicle comfort point of view, analyzes the reasonsfor these phenomena, and propose solutions.Auto body resonance mainly because while the frequency of the excitation source withthe body of a natural modal frequencies coincide, the vibration amplitude will be huge, whilethe damping of the system is close to zero, the amplitude tends to infinity, the comfort willimpact.Modal parameters of the body, engine vibration excitation frequency and wheelexcitation frequency analysis and found that the larger the incentive and the body of theengine vibration excitation as well as wheel unbalance the natural frequency of coincidencebandwidth. In the frequency domain, the incentive the frequency increases, the vibration ofthe body is still not fully decay from the low-order modal frequency at resonance, andhigh-order mode the resonance frequency superimposed, resulting in the above phenomenon.In response to this problem, the main solution is to improve the body structure, but inthe actual production related to the re-design the mold, so that the car design and productioncosts have greatly increased. We consider that through the vehicle driveline parameters tooptimize the use of "shift frequency ", commonly used within the speed range of theexcitation source frequency moved outside the body resonance frequency range. To improve comfort, optimiz the vehicle designing process.In a lot of reading literature on the basis of a new powertrain matching method,matching comfort while taking into account the requirements of the vehicles on the power,economy, considering the powertrain. On the basis of previous research, focusing on balancecomfort, powertrain matching launched the following areas:Auto body due to the different structural forms of the natural frequency distribution isnot the same. Excitation source to produce the vehicle vibration, engine combustion drivingforces, torsional vibration, the quality of the imbalance of the wheel and road vibration. Toanalyze the natural frequency of the body as well as the excitation source on the principle ofa body resonance.The establishment of the mathematical model of the car engine mathematical model andperformance evaluation. Automotive power source discussed in this article for four-strokegasoline engine, with the development of the internal combustion engine technology, thegasoline combustion efficiency of utilization has reached about30%to35%, but the vehicleenergy efficiency is only11%to18%this is caused by the transmission system matchingunreasonable.Both of the vehicle powertrain matching method based on power, economy and comfort,the transmission system parameters to optimize. Optimization of powertrain to avoid in thecommon speed limits within the resonance, to improve the comfort.Proposed take into account the comfort of the vehicle powertrain matching methodcorresponding to the transmission system to match the evaluation method, the parameteroptimization of the powertrain comprehensive evaluation before and after the carperformance.