共查询到19条相似文献,搜索用时 250 毫秒
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为了从机理上揭示造成换挡冲击的原因,指导换挡过程建模和制定动力传动系统协调控制策略,以1-2升挡过程为例,对研究对象进行了运动学分析,并应用Lagrange方程进行了行星齿轮液力自动变速器换挡过程动力学分析,得到了考虑行星齿轮系统各构件及轴系的转动惯量的换挡过程动力学方程,为建立换挡过程模型奠定了基础。在升挡过程转矩相,得到了变速器输入轴转矩和离合器传递的摩擦转矩之间的定量关系,给出了转矩相发动机转矩和离合器摩擦转矩的协调控制方法。在升挡过程惯性相,得出了涡轮转速变化率与换挡冲击的关系,为制定换挡过程动力传动系统协调控制策略奠定了基础。对换挡动态过程进行了适当的简化,给出了升挡过程变速器输出轴转矩的近似估计方法。 相似文献
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自动变速器换挡锁定控制系统是一个安全装置,可在发动机运转时防止变速杆意外脱离“PARK(停车)”位。驾驶人在将变速杆移出“PARK”位前,必须踩下制动踏板。该系统主要由自动变速器换挡锁定控制电磁阀、车身控制模块(BCM)和变速器控制模块(TCM)等部件组成:图1为制动器与自动变速器换挡互锁及升挡/降挡开关电路。 相似文献
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(2)有重叠换挡控制自动变速器的换挡品质问题
有关帕萨特B5和奥迪A6轿车01V(5HP-19)自动变速器换挡冲击(包括升挡冲击和降挡冲击)的案例已有许多报道,且往往是控制系统(包括电磁阀或阀体)造成的,这是为什么呢?为了简化结构、减轻重量和减小拖滞损耗,一些新型的自动变速器往往少用单向离合器甚至不用单向离合器,如5HP—19只用了1个单向离合器,[第一段] 相似文献
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自动变速器在自动变换挡位时,动力传递不会中断.车速和发动机转速也不会立刻发生变化,所以换挡造成传动比突变时,必然会引起动力传动系统冲击,即换挡冲击。单向离合器在自动变速器中的作用是消除换挡时的降挡冲击,在消除换挡冲击的各种方法中.单向离合器是消除降挡冲击的最有效措施。 相似文献
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本文针对一款装有机械式自动变速器和后驱电机的混合动力汽车开发了协调换挡控制策略,对车辆冲击和离合器摩擦损失进行优化。控制策略将换挡过程分为发动机主动调速、离合器接合和恢复并联驱动3个阶段。采用模糊PID控制器和模糊控制器分别进行发动机转速调节和离合器接合速度调节,并用电机对动力系统转矩波动进行补偿。仿真和台架试验结果,采用虽然该协调控制策略虽然换挡时间相对延长,但能同时减小车辆冲击和离合器摩擦损失,将冲击度控制在±4 m/s^3范围内,并只产生很小的离合器摩擦损失,汽车的换挡品质得到明显改善。 相似文献
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J. Galindo H. Climent C. Guardiola J. Doménech 《International Journal of Automotive Technology》2009,10(2):141-149
Parallel sequential turbocharging systems are able to operate in different modes, which are defined according to the turbochargers
that simultaneously boost the engine, and are controlled by means of specific valves. In order to cover the full engine operating
range, a smooth transition between turbocharging operating modes must be ensured. However, important disturbances affect both
boost and exhaust pressure when shifting the operation mode, thus causing non-negligible torque oscillations. This paper presents
different methods for smoothing such undesirable effects during mode transition. Strategies covering optimal synchronization
of the control valves, control of the valves’ position, and correction of the injected fuel during the transition are analysed.
A fully instrumented passenger car engine is used for illustrating the different torque smoothing methods, and experimental
results for transitions during both steady operation and engine accelerations are shown. 相似文献
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由于行星排功率分流式混合动力汽车的结构优势,双行星排功率分流式混合动力汽车已经成为各机构的研究重点。由纯电动模式到混合驱动模式切换的过程中存在发动机起动和发动机转矩引入,而发动机转矩瞬态响应存在迟滞,导致切换过程中动力系统的输出转矩会有较大波动。为减小波动,降低模式切换过程中的动态冲击度,本文中提出补偿滑模控制方法,对双行星排功率分流式混合动力汽车模式切换进行协调控制。首先,建立整车动力学模型,对切换过程每个模式进行分析;之后,针对发动机拖转阶段和混合驱动阶段分别采用补偿控制和基于固定边界层的自适应滑模控制,并对滑模控制进行稳定性分析;最后,结合Matlab/Simulink软件平台进行仿真验证。仿真结果表明,补偿滑模协调控制策略能够有效地减小从纯电动到混合驱动模式切换过程中的转矩波动和冲击度。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(9):1269-1295
For a hybrid car equipped with dual clutch transmission (DCT), the coordination control problems of clutches and power sources are investigated while taking full advantage of the integrated starter generator motor's fast response speed and high accuracy (speed and torque). First, a dynamic model of the shifting process is established, the vehicle acceleration is quantified according to the intentions of the driver, and the torque transmitted by clutches is calculated based on the designed disengaging principle during the torque phase. Next, a robust H∞ controller is designed to ensure speed synchronisation despite the existence of model uncertainties, measurement noise, and engine torque lag. The engine torque lag and measurement noise are used as external disturbances to initially modify the output torque of the power source. Additionally, during the torque switch phase, the torque of the power sources is smoothly transitioned to the driver's demanded torque. Finally, the torque of the power sources is further distributed based on the optimisation of system efficiency, and the throttle opening of the engine is constrained to avoid sharp torque variations. The simulation results verify that the proposed control strategies effectively address the problem of coordinating control of clutches and power sources, establishing a foundation for the application of DCT in hybrid cars. 相似文献
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This study proposes a design for an idle speed controller to compensate for varying engine load and friction torque in passenger car diesel engines. An active disturbance rejection control (ADRC) framework, comprised of a disturbance compensator and a feedback controller, is applied to an idle speed controller to compensate for disturbances such as engine load and friction torque. In addition, a feedforward compensator is designed into the ADRC framework to improve disturbance rejection performance. The proposed controller is validated by engine and vehicle experiments and the experiment results are compared with a commercial controller. 相似文献
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为了解决混合动力系统动力耦合的响应性和舒适性问题,建立混动离合器C0起动发动机过程和并联动力输出模式下的功率流模型。对C0起动发动机的控制过程进行仿真分析,针对C0的起动扭矩和电机的输出扭矩在时间和空间上的匹配问题,提出以换挡离合器的滑摩控制来进行缓冲的策略。为了实现稳定精确的发动机起动控制,消除各自的扭矩控制、液压系统特性的误差,提出C0离合器起动发动机的自适应控制和B1离合器滑摩自适应控制,以换挡离合器滑差和发动机转速的超调量为监控对象,对C0离合器各阶段压力控制参数进行自适应调整,以优化发动机起动过程。研究结果表明:通过换挡离合器的滑摩控制可以很好地解决C0离合器扭矩和电机扭矩的匹配问题,即使在换挡过程中对发动机起动也能保证良好的舒适性,并控制过程时间在1.5 s内;在整车试验过程中,通过对C0压力的自适应调整,发动机转速的超调和起动冲击问题均可以得到有效解决。 相似文献
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Z. Zhong G. Kong Z. Yu X. Xin X. Chen 《International Journal of Automotive Technology》2012,13(3):487-496
The automated mechanical transmission (AMT) is gaining popularity in the automotive industry, due to its combination of the
advantages of mechanical transmissions (MT) and automatic transmissions (AT) in terms of fuel consumption, low cost, improved
driving comfort and shifting quality. However, the inherent structural characteristics of the AMT lead to disadvantages, including
excessive wear of the clutch plates and jerk and traction interruption during the shift process, that severely affect its
popularity in the automatic transmission industry. The emerging technology of shifting control without the use of the clutch
is a promising way to improve the shifting transients of AMTs. This paper proposes a control algorithm that combines speed
and torque control of the AMT vehicle powertrain to achieve shifting control without using the clutch. The key technologies
of accurate engine torque and speed control and rapid position control of the shift actuators are described in detail. To
realize accurate engine speed control, a combined control algorithm based on feed-forward, bang-bang and PID control is adopted.
Additionally, an optimized closed-loop position control algorithm based on LQR is proposed for the shift actuators. The coordinated
control algorithm based on engine and shift actuator control is described in detail and validated on a test vehicle equipped
with an AMT. The results show that the coordinated control algorithm can achieve shifting control without the use of the clutch
to improve driving comfort significantly, reduce shift transients and extend the service life of the clutch. 相似文献
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一辆装备F22B4型发动机,MPOA型自动变速器的本田雅阁轿车,在行驶过程中D4档指示灯不亮,并且自动变速器在换挡时出现较大冲击现象。根据″从简单到复杂,从外部到内部″诊断自动变速器故障的原则,对该故障现象进行了分析诊断,结果是该自动变速器控制TCM功能失效所致。 相似文献