共查询到19条相似文献,搜索用时 421 毫秒
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本文通过试验数据建立了发动机数值模型,确定了发动机最佳经济性与最佳动力性工作线,比较了装用有级变速器(MT)与装用无级变速器(CVT)的羚羊轿车的动力性和经济性,表明CVT比MT优越。 相似文献
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丰田佳美(Camry V6,3.0L)轿车,采用A541E型自动变速器。该变速器的电子控制系统具有的多项功能,使变速器与发动机能运转协调,并使汽车起步和换档工作平顺,介绍了电控系统的组成特点,工作原理和故障诊断方法。 相似文献
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本文全面分析了重型汽车发动机,传动系等对变速器,分动器齿累承载能力计算中系数K4的影响,结合具体的使用条件,推荐选用合适的使用系数。 相似文献
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发动机制动是车辆减速的一种有效方式,拥有很多优点。对于手动变速器车辆,车辆行驶时,发动机与驱动轮之间近似为刚性联接,所以容易实现发动机制动;但对于自动变速器车辆,发动机制动实现起来却复杂得多。基于NISSAN TEANA采用的RE4F04B自动变速器,详细分析了发动机制动的工作条件与故障诊断步骤。 相似文献
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发动机制动是车辆非常有效的一种减速方式,拥有很多优点。对于手动变速器车辆,车辆行驶时,发动机与驱动轮之间近似为刚性联接,所以很容易实现发动机制动;但对于自动变速器车辆,发动机制动实现起来却很复杂。基于NISSAN TEANA采用的RE4F04B自动变速器,详细分析了发动机制动的工作条件与故障诊断方法。 相似文献
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无级变速器(CVT)的工作原理与一般自动变速器相似,而其燃油经济性与手动变速器相似。无级变速器实际工作时,能够以不打滑方式进行,并允许发动机保持在最佳功率范围内运行,从而取得更好的燃油经济性。 无级变速器在较低的传动比范围内工作,可取得更高的加速性能和更优的发动机制动。此外,“L”档位也用于 相似文献
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(二)液力变矩器的结构与工作原理
液力变矩器是液力传动中的又一种型式,是构成液力自动变速器不可缺少的重要组成部分之一。它装置在发动机的飞轮上,其作用是将发动机的动力传递给自动变速器中的齿轮机构,并具有一定的自动变速功能。自动变速器的传动效率主要取决于变矩器的结构和性能。 相似文献
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电控自动变速器的故障诊断 总被引:1,自引:0,他引:1
皇冠3.0轿车采用A340E电控自动变速器,与2JE-GE发动机匹配,它结构复杂,产生故障的原因很多,产生故障的原因主要来自变速器油、电控系统、发动机、变速器内部四个方面,对各种故障的诊断方法和产生原因进行了详细地介绍。 相似文献
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In this study, a control strategy for a dual mode power split-type hybrid electric vehicle (HEV) is developed based on the powertrain efficiency. To evaluate the transmission characteristics of the dual mode power split transmission (PST), a mechanical loss model of the transmission (TM loss) is constructed. The transmission efficiency, including the TM loss, is evaluated for the dual mode PST. Two control strategies for the dual mode PST are proposed. An optimal operation line (OOL) control strategy is developed to maintain a high engine thermal efficiency by controlling the engine operation point on the OOL. A speed ratio (SR) control strategy is proposed to obtain a greater transmission efficiency by shifting the engine operation point when the dual mode PST operates near the mechanical points. Using the TM loss and the proposed control strategies, a vehicle performance simulation is conducted to evaluate the performance of the two control strategies for dual mode PST. The simulation results demonstrate that, for the SR control strategy, the engine efficiency decreases because the engine operates beyond the OOL. However, the transmission efficiency of the dual mode PST increases because the PST operates near the mechanical point where the PST shows the greatest transmission efficiency. Consequently, the fuel economy of the SR control strategy is improved by 3.8% compared with the OOL control strategy. 相似文献
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汽车发动机与传动系联合操纵的研究 总被引:1,自引:0,他引:1
为实现电控机械式自动变速系统的统一控制,本文展开了以下三个方面的研究:首先,为该系统建立了一种最佳变速特性曲线;其次,为其加速踏板设计了一种稳定实用的踏板工作曲线;最后,通过动力分析,确定了在换档过程中,系统各总成应采取的控制策略。 相似文献
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J. Kim J. Kang Y. Kim T. Kim B. Min H. Kim 《International Journal of Automotive Technology》2010,11(4):565-571
The power split type hybrid system transmits engine power by dividing it into the electrical unit and the mechanical unit.
Its power transmission efficiency is highest at the mechanical point (MP), where the full power is transmitted to the mechanical
unit. In this study, the equation for the MP was derived for the gear ratios of a general 4-node lever model. The MP characteristics
for the transmission ratio (TR) of the input split and compound split structures were examined using the equation derived.
Using the examined input split and compound split structures, a systematic design method for the dual mode power split transmission
was proposed. In the dual mode power split transmission, the MP could be positioned at the desired TR, and the input split
and compound split modes could be selectively used according to the clutch combination, which leads to the operation of the
vehicle within a high system efficiency range. 相似文献
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前向式混合动力汽车模型中传动系建模与仿真 总被引:7,自引:0,他引:7
根据传动系中两个非线性环节——离合器和变速器的状态,在Matlab/Simulink和Matlab/Stateflow平台上建立了包含四种状态的传动系模型,并以加速踏板行程和制动踏板行程为输入量对传动系模型进行了仿真计算。仿真结果表明,该模型既可以保持内燃机转速、电机转速和车速的连续变化,又可以模拟出离合器和变速器的动作,可以在前向式混合动力汽车模型中得到应用。 相似文献
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龙建强 《筑路机械与施工机械化》2010,27(5):73-75
本文对铣刨机的液压行走系统和铣刨宽度、传动方式与铣削作业系统的进行了分析。在结合发动机特性曲线基础上,探讨了铣刨机发动机功率分配的原则。铣刨机功率分配的原则应为保证各系统功率之和与发动机目标值功率相一致,使机器有最好的动力性、经济性和作业生产率,可以为铣刨机设计提供参考。 相似文献
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一辆日本生产的本田(HONDA ACCORD LX)轿车,配置有电子控制汽油喷射式发动机和七档的自动变速器。在使用中,发动机转速得升到400r/min以上,变速器才能自动换档(正确时在2000r/min左右自动换档),即存在换档时刻过于迟缓的故障,在正确分析故障原因的基础上,准确地排除了这一疑难故障。 相似文献
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F. Payri A. J. Torregrosa A. Broatch L. Monelletta 《International Journal of Automotive Technology》2009,10(6):761-769
Combustion noise in passenger cars powered with direct injection (DI) diesel engines is frequently the main reason why end-users
are reluctant to drive this type of vehicle. Thus, the great potential of diesel engines for environment preservation — due
to their lower CO2 emissions — could be missed. This situation worsens with the current design trends (engine downsizing) and the emerging new
diesel combustion concepts (Homogeneous Charge Compression Ignition-HCCI, Premixed Charge Compression Ignition-PCCI, etc.),
which are intrinsically noisy. This negative feature can be even more critical in transient operation due to the contribution
of the temporal changes of both source and transmission path on engine noise. Therefore, combustion noise must be considered
as an additional essential factor in engine development, together with performance, emissions and driveability. Thus, suitable
evaluation procedures that can be integrated into the global engine development process in a timely and cost-effective manner
are imperative. Regarding the evaluation procedures, most of the work available in the literature addressed combustion noise
at steady operation. To surpass this limitation, two possible approaches — adapted from the classical and multiple regression
methods — for the overall level assessment of combustion noise in transient conditions are evaluated in this paper. 相似文献
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凯迪拉克元首轿车装用的4L60-E型自动变速器与发动机由同一个控制电脑(动力控制模块PCM)协调控制,能够精确地控制变速器换挡时机。介绍了4L60-E型自动变速器的组成与结构,电子控制系统故障自诊断,液压压力测试及道路试验。 相似文献