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B. Supriyo K. B. Tawi H. Jamaluddin 《International Journal of Automotive Technology》2013,14(2):313-323
This paper introduces an electro-mechanical, dual acting pulley, continuously variable transmission (EMDAPCVT) and presents its real time ratio controller using a proportional-derivative-plus-conditional-integral (PDPCI) controller. The ratio controller system is developed based on primary (input) and secondary (output) pulley position controllers. Each position controller has two PID parameters, releasing and clamping, which are determined experimentally using a relay feedback method. A PC-based ratio controller system is implemented using Matlab/Simulink® software and a Keithley DAS-1602 data acquisition system card. The experimental results show that the PDPCI controller system can control the CVT ratio adequately. 相似文献
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全电调节橡胶带式CVT的试验研究 总被引:1,自引:0,他引:1
在分析现有带式CVT调节方式优缺点的基础上,提出了一种采用双电机分别调节主、从动带轮工作半径以实现速比变化的全电调节方式,并以橡胶V型带CVT为应用对象研制了首台全电调节CVT样机.通过台架试验对样机进行测试.得到了其速比与执行电机转角的对应关系以及不同速比下其传递转矩和传递效率随带轮动盘夹紧力的变化规律,从而验证了全电调节无级变速的可行性. 相似文献
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A modified CVT ratio map is proposed to obtain the improved fuel economy for a metal belt CVT. Since the CVT system loss,
which occupies most of the drivetrain loss, depends on the engine speed, input torque, primary and secondary actuator pressure,
a modified CVT ratio map is produced to realize the highest engine-CVT overall efficiency through the consideration of CVT
system loss. The modified CVT ratio map is constructed with respect to the demanded vehicle power and present vehicle speed
based on the steady state CVT system loss. Using the modified CVT ratio map, performance simulations are carried out using
the dynamic models of the CVT powertrain. The simulation results indicate that the modified CVT ratio control provides improved
engine-CVT overall system efficiency, and improves the fuel economy of the federal urban driving schedule by 4.9 percent. 相似文献
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焊接后马上回火,虽然回火温度不足以让组织产生相变,但却让焊缝冷却时间变长,有利于贝氏体的形成,同时,也延长了马氏体的相变时间,使晶粒变粗,导致抗疲劳强度下降,造成焊缝在耐久试验中破损。在整个回火工艺中要避免贝氏体的产生,保证珠光体和马氏体的组织生成,缩短马氏体的相变时间,这样才能提高焊缝的抗疲劳强度。 相似文献
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Arian Afrabandpey Hashem Ghariblu 《International Journal of Automotive Technology》2018,19(3):547-557
This study aims at finding an analytical model of ball continuously variable transmission (B-CVT) behavior and performance, based on the existing model of the half-toroidal traction drive. The geometrical and kinematical aspects of this model have been found. Then, force-moment equilibrium equations have been applied for a B-CVT. The contact behavior has been modeled using the isothermal elastohydrodynamic lubrication (EHL) theory, and spin and relative slip losses have been estimated for this CVT. Finally, the overall efficiencies of the B-CVT have been analyzed and compared with the halftoroidal traction drive. This study results have shown that B-CVT has higher torque efficiency and lower speed efficiency in comparison with half-toroidal CVT. Also, it has shown that the adjustment of axial forces in B-CVT leads to higher efficiency in lower input torques. 相似文献
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起步控制一直是困扰自动离合器的难题。湿式多片离合器结构简单,布置方便,因而控制容易、成本低,近年来在CVT上得到了广泛的应用。 相似文献
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为了降低整车油耗及排放, 48 V轻度混合动力启停技术是一种低成本且易于实现的解决方案。以无级自动变速器(CVT)为本体对象,开发了基于电子油泵的启停技术,完成了电子油泵参数设计和布置,并根据启停功能需求开发启停协同控制的控制策略,该控制策略既能满足基本启停需求,同时也没有降低拥堵工况下的车辆起步驾驶性能。对装备该启停系统的CVT进行了NEDC+ECE循环测试,未装备启停系统的车辆油耗测试为6.4 L/100 km,装备启停系统的车辆油耗为6.13 L/100 km,油耗下降了4.2%。同时排放测试显示,在ECE工况下排放减少了12%。试验结果表明,启停系统使油耗和排放明显降低,达到了预期的效果。 相似文献
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针对装配式桥梁预制件的预埋钢绞线吊环受力性能展开试验研究。考虑吊环形状、埋置深度、是否设置P锚等参数,共设计制作了6个不同的钢绞线吊环,通过拔出试验对钢绞线吊环的力学性能进行了测试。根据试验结果,钢绞线与混凝土粘结强度较低,很难充分发挥其抗拉强度;在钢绞线埋置端设置P锚和锚固钢板,可大幅提高其承载力并减小埋置深度。此外,对某高速公路130t预制桥墩在原位竖直起吊、放倒和扶直等过程中钢绞线吊环的应变进行测试,验证了预埋钢绞线吊环的安全性,指出了钢绞线吊环受力的不均性特性,并对实际工程吊环设计提出优化建议。 相似文献
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《JSAE Review》1995,16(3):251-256
We have developed a continuously variable transmission (CVT) which has superior transfer efficiency, by thoroughly reducing transfer loss by means of using a dry hybrid belt, using no lubrication composition system around the belt, and using an electric control system of a DC motor.The fuel efficiency and driveability of the prototype vehicle equiped with the CVT were proven equivalent or even superior to a 5 speed manual transmission. 相似文献