共查询到20条相似文献,搜索用时 31 毫秒
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文中提出了一种新型电机转角估计方法,将估算结果通过传动比反算至转向盘转角,并依靠改进的回正控制策略,运用估算的转向盘转角及转矩计算回正助力力矩。仿真结果表明:该方案不但可以达到良好的回正效果,并且有利于转向状态间的柔和切换,同时由于无传感器转角估计减少了电机控制模块的成本。 相似文献
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基于SVPWM的基本原理、推导法则和控制算法,对电子制动助力的永磁同步电机进行电流环的精确控制,再加上对转速环和行程环的精确控制,实现通过电机对制动系统提供助力。通过台架和整车测试,结果表明该控制方法可行,并得到了工程应用。 相似文献
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针对基于集成起动机/发电机(ISA)的汽车各部件的特性和系统的设计目标,建立了柴油机、ISA电机和整车的数学模型,在实现柴油机、ISA电机、蓄电池和传动系统之间最佳匹配的前提下,提出了以蓄电池SOC、车速、柴油机转速、功率以及燃油经济性为主要参数的控制策略.运用Matlab/simulink软件,根据控制策略进行了启动、助力、充电等工况的动力性仿真,并在CYC_ECE_EUDC行驶循环工况下进行整车模拟试验.结果表明,所提出的控制策略能满足ISA汽车的迅速起步、低速补偿转矩、加速时提供辅助动力和充电功率恒定等要求,实现了起步一助力-发电功能一体化. 相似文献
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为研究新能源汽车发卡电机绕组交流电阻的影响因素,引入交流电阻系数,建立发卡交流电阻、涡流电阻的计算公式,并以8极48槽电机为例,分析电机转速、电流、发卡温度、磁钢、硅钢片性能、发卡截面尺寸、定子槽尺寸及发卡槽内位置等因素对发卡交流电阻的影响,并对比不同因素下的发卡电流密度分布.结果表明:转速是影响发卡电机交流电阻的最主... 相似文献
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为解决隧道掘进机运行过程中刀盘驱动系统各电机受力不均衡导致的部件损坏或系统故障的问题,对刀盘驱动系统结构及控制模式进行分析,建立电机矢量控制模型,提出一种改进的刀盘驱动耦合控制结构。该结构一方面可以增加从电机给定转速选择功能,消除起动阶段延时引起的同步误差;
另一方面,可以通过转速补偿耦合策略缩小电机之间的转速差。在控制方法上,设计神经网络PI控制器来控制各个电机的转速,使控制系统能够根据载荷的变化自适应调整控制参数,提高控制精度。最后,通过建立Simulink仿真模型,对比自适应耦合控制与主从控制、并行控制的同步效果。结果表明,所提出的自适应耦合控制方法能够使控制中的各个环节相互配合,可达到较好的控制性能和响应转速。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(8):1066-1098
This paper qualitatively and quantitatively reviews and compares three typical tyre–road friction coefficient estimation methods, which are the slip slope method, individual tyre force estimation method and extended Kalman filter method, and then presents a new cost-effective tyre–road friction coefficient estimation method. Based on the qualitative analysis and the numerical comparisons, it is found that all of the three typical methods can successfully estimate the tyre force and friction coefficient in most of the test conditions, but the estimation performance is compromised for some of the methods during different simulation scenarios. In addition, all of these three methods need global positioning system (GPS) to measure the absolute velocity of a vehicle. To overcome the above-mentioned problem, a novel cost-effective estimation method is proposed in this paper. This method requires only the inputs of wheel angular velocity, traction/brake torque and longitudinal acceleration, which are all easy to be measured using available sensors installed in passenger vehicles. By using this method, the vehicle absolute velocity and slip ratio can be estimated by an improved nonlinear observer without using GPS, and the friction force and tyre–road friction coefficient can be obtained from the estimated vehicle velocity and slip ratio. Simulations are used to validate the effectiveness of the proposed estimation method. 相似文献
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Fault detection method for electric parking brake (EPB) systems with sensorless estimation using current ripples 总被引:1,自引:0,他引:1
C. W. Lee H. B. Chung Y. O. Lee C. C. Chung Y. S. Son P. Yoon 《International Journal of Automotive Technology》2010,11(3):387-394
A fault detection method with parity equations is proposed in this paper. Due to its low cost implementation, the velocity
of the motor is not measurable in electric parking brake (EPB) systems. Therefore, residuals are not reliable when estimating
the motor velocity with a low-resolution encoder. In this paper, we propose a fault detection method with sensorless estimation
using current ripples that estimates the position and velocity of the motor by detecting periodical oscillations of the armature
current caused by rotor slots. In addition, this method can estimate the position and velocity of the motor with less computational
effort than a state observer. Moreover, the method is less sensitive to motor parameters than model-based estimation methods.
The effectiveness of this method is validated with experimental data, and the simulation results show that various faults
have their own residual patterns. Therefore, we can detect the presence of faults by monitoring the residual signals. 相似文献
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With the real time and accurate information of motor torque and rotation speed of the four-in-wheel-motordrive electric vehicles, a slip based algorithm for estimating maximum road friction coefficient is designed using Lyapunov stability theory. Modified Burckhardt tire model is used to describe longitudinal slip property of the tire. By introducing a new state variable, a nonlinear estimator is proposed to estimate the longitudinal tire force and the maximum road friction coefficient simultaneously. With the appropriate selection of estimation gain, the convergence of the estimation error of the tire longitudinal force and maximum road friction coefficient is proved through Lyapunov stability analysis. In addition, the error is exponentially stable near the origin. Finally the method is validated with Carsim-Simulink co-simulation and real vehicle tests under multi working conditions in acceleration situation which demonstrate high computational efficiency and accuracy of this method. 相似文献
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测定汽车滑行阻力系数的方法 总被引:10,自引:1,他引:10
从汽车滑行运动微分方程入手,经过积分推导出滚动阻力系数和空气阻力系数与滑行初速度、滑行总时间和滑行总距离之间的关系,用滑行过程中3个瞬时点的记录参数组成方程组,再用MATLAB求方程组的数值解,即可求出汽车的滚动阻力系数和空气阻力系数。本方法只需一次滑行试验,既方便易行,又比较准确。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1779-1796
The paper presents an anti-lock braking system (ABS) control logic based on the measurement of the longitudinal forces at the hub bearings. The availability of force information allows to design a logic that does not rely on the estimation of the tyre–road friction coefficient, since it continuously tries to exploit the maximum longitudinal tyre force. The logic is designed by means of computer simulation and then tested on a specific hardware in the loop test bench: the experimental results confirm that measured wheel force can lead to a significant improvement of the ABS performances in terms of stopping distance also in the presence of road with variable friction coefficient. 相似文献
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自动变速器离合器的模糊控制 总被引:1,自引:0,他引:1
对汽车起步过程中的离合器进行多目标函数综合化,能够对控制目标进行全面评价,在此基础上,对机械式自动变速器中的离合器采用变量化因子模糊调节与变系数比例调节相结合的控制方法,不但实现了汽车的平稳起步,同时也延长了离合器的使用寿命。 相似文献
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基于AMESIM的全液压推土机行走驱动系统仿真 总被引:4,自引:1,他引:4
运用仿真手段,研究了全液压推土传动系统的速度刚度和变量泵、马达的容积效率,给出了全液压推土机的泵、马达配置的一般原则和合适的排量比取值范围;讨论了CUT-OFF阀在液压驱动的推土机上的使用问题,提出将压力引入发动机的控制. 相似文献
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Long Chen Mingyuan Bian Zhaobo Qin Keqiang Li 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2016,54(1):1-19
In this paper, a resonance frequency-based tire–road friction coefficient (TRFC) estimation method is proposed by considering the dynamics performance of the in-wheel motor drive system under small slip ratio conditions. A frequency response function (FRF) is deduced for the drive system that is composed of a dynamic tire model and a simplified motor model. A linear relationship between the squared system resonance frequency and the TFRC is described with the FRF. Furthermore, the resonance frequency is identified by the Auto-Regressive eXogenous model using the information of the motor torque and the wheel speed, and the TRFC is estimated thereafter by a recursive least squares filter with the identified resonance frequency. Finally, the effectiveness of the proposed approach is demonstrated through simulations and experimental tests on different road surfaces. 相似文献
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S. B. Choi 《International Journal of Automotive Technology》2011,12(2):207-212
An adaptive control algorithm was developed for the sensorless speed control of a permanent-magnet DC motor directly connected
to the hydraulic pump of an antilock brake system. Due to the severe cost and reliability constraints of the application,
the motor speed was controlled by a very simple on-off switching method, in which the only measurement required is the voltage
across the control switch. The motor speed was calculated solely from the back-EMF voltage during the period of the control
cycle when the switching controller is in the switch-off mode. The stability of the developed adaptiveswitching control algorithm
was proven mathematically and confirmed experimentally in several vehicle tests over a wide range of target speeds and pump-load
conditions. The accuracy and the response time of the controller can easily be tuned by adjusting a single tuning parameter.
The switching frequency of the controller can also easily be tuned by adjusting the over-and undershoot thresholds independently
from the accuracy of the speed-tracking control. 相似文献