奔驰W140自动锁止差速器系统的检修(上)

一、自动锁止差速器的工作原理 自动锁止差速器(ASD)由电脑控制,只有在需要时,才与差速锁止机构啮合.位于速度表内的功能指示灯点亮,表明ASD与锁止机构啮合.     

奔驰W140自动锁止差速器系统的检修

一、自动锁止差速器的工作原理自动锁止差速器(ASD)由电脑控制,只有在需要时,才与差速锁止机构啮合。位于速度表内的功能指示灯点亮,表明ASD与锁止机构啮合。来自速度传感器的信号传给ASD电脑,ASD电脑将前后轮的平均速度信号进行处理后,向各液压单元内的电磁阀发出一个指令。随     

该车的差速锁为啥不起作用

故障现象:一辆斯太尔载货汽车,一次左后车轮陷入泥坑后,接通差速器锁止装置,左后轮仍打滑,右后轮则仍不转动,说明差速锁没有起作用。故障检查:检查差速锁电子控制部分的开关、线路、电磁阀均正常;接通差速器锁止开关后电磁阀能够开启;检查控制气缸的工作情况时,发现压缩空气进入气缸后有严重的漏气声;拆开控制气缸,发现活塞皮碗已破裂,同时花键槽已锈蚀。故障排除:更换气缸活塞皮碗,彻底清除花键槽的锈迹并涂抹润滑脂,装复后接通差速锁开关,两驱动轮即以相同的速度转动,说明故障已排除。故障分析:由于控制气缸皮碗破裂漏气,致使气缸压力降低…     

越野汽车差速器同步锁止机构自动控制系统控制门限的研究

本文阐述了越野汽车差速器同步锁止机构自动控制系统的组成和工作原理，分析了其控制门限；利用所建立的三轴汽车转向行驶运动模型，在理论上确定了越野汽车差速器同步锁止机构自动控制系统的响应界限；通过对同步锁止机构牙嵌式离合强度和接合特性的分析研究，确定了牙嵌式离合器允许的最高转速差，从而确定了动作限值的上限。     

越野车辆差速器同步锁止机构自动控制系统模糊控制方法研究

本文采用模糊控制方法对差速器同步锁止机构自动控制系统进行了研究。建立了车辆模糊控制模型，并进行了模拟实验。模拟实验结果表明：基于模糊控制的差速器同步锁止机构自动控制系统鲁棒性强，控制效果好，系统的移植性好。     

这辆斯太尔汽车差速锁为何不起作用

故障现象：一辆斯太尔汽车,左后轮陷入泥坑后,接通差速器锁止装置,但左后轮仍打滑,右后轮则仍不转动,证明差速锁不起作用了。故障检查：检查差速锁电子控制部分的开关、线路、电磁阀等,技术状况良好。接通差速锁止开关后电磁阀也能够开启。检查控制汽缸的工作情况,发现压缩空气进入汽缸后有严重的漏气现象。拆检控制汽缸,发现活塞皮碗已经严重破损,花键槽也已经锈蚀。     

四轮驱动ABS控制方法的分析

以四轮驱动汽车为研究对象,分析了其在差速器锁止时制动防抱死控制过程所出现的问题,归纳总结了四轮驱动ABS控制技术的特点及对制动安全性的影响。     

马自达故障六例

一、马自达323LX轿车摩擦片式差速器无法锁止故障现象一辆马自达323LX轿车行驶在泥泞的陡坡上,出现后桥一侧车轮打滑,汽车无法行驶的现象。故障分析与排除该车装置有摩擦片式差速器。它是普通锥齿轮差速器的变型,是通过增加差速器内的摩擦力来实现差速器锁止(即防滑)目的。为了增加差速器的内摩擦力,在半轴齿轮和差速器壳之间装有主从动摩擦片和推     

更换钥匙后发动机不能起动

故障现象：一辆奥迪A6轿车,原来工作正常,更换了一把新配制的钥匙后,起动时发动机只“突、突”一响就熄火了,且起动锁止警告灯一直闪烁。故障分析：奥迪A6轿车装备了MPFI系统ECU（多点汽油喷射系统电子控制单元）、起动锁止ECU及点火开关脉;中应答器,三者之间用导线连接。奥迪公司对MPFI系统ECU和起动锁止ECU输入了同一个永久密码,因此只有使用原车钥匙才能顺利起动。     

本田雅阁换挡杆不能移动

故障现象一辆本田雅阁2.4L乘用车,行驶里程为2.6万km。启动发动机后换挡杆位于P挡不能移动。故障诊断与分析该车自动变速器换挡杆的下方有一个挡位锁止开关。通过制动开关的信号输入到变速器的控制单元使挡位开关工作,打开挡位开关的锁止通道,变速器换挡杆才能移动。首先检查制     

Co-operative control for regenerative braking and friction braking to increase energy recovery without wheel lock

This paper presents a regenerative braking co-operative control algorithm to increase energy recovery without wheel lock. Considering the magnitude of the braking force available between the tire and road surface, the control algorithm was designed for the regenerative braking force at the front wheel and friction braking force at the rear wheel to be increased following the friction coefficient line. The performance of the proposed regenerative braking co-operative control algorithm was evaluated by the hardware in the loop simulation (HILS) with an electronic wedge brake on its front wheels and an electronic mechanical brake on its rear wheels. The HILS results showed that a proper braking force on the front and rear wheels on a low μ road prevented the lock of the front wheels that was connected to the motor, and maintained the regenerative braking and increased energy recovery.     

三轴汽车前后轮角输入时的响应特性

本文详细推导了三轴汽车线性二自由度模型的运动微分方程，分析了汽车对前后轮角输入时的移居记响应特性。从汽车动力学的角度讨论了前后轮转应具备的比例关系。该方法同样适用于其它多轴汽车的建模分析。     

A Comparative Study of Four Wheel Steering Models Using the Inverse Solution

An inverse solution study of various four wheel steering models is carried out for the purpose of comparison of steering/braking input needed to track a lane change maneuver. Optimal control is used to solve the non-linear inverse problem. Comparisons are made when the vehicle is coasting, when the time required to track the trajectory is minimized with appropriate utilization of brake/traction forces, and in a front wheel lock situation. A rear steering model which produces neutral steering characteristics displayed the best steering behavior with respect to ease of steering.     

全轮驱动的奥迪轿车托森差速器的结构与工作原理

现代轿车的前轿与后轿之间装设了轴间中央差速器，奥迪车所采用的为格力森公司设计的新型的托森差速器，详细介绍了奥迪用的托森差速器的结构，分析了汽车直线行驶状态和汽车转变行驶状态下托森差速器工作原理和工作过程，同时简要介绍了托森差速器的锁紧系统。     

Speed ratio control of a parallel layout double cavity half-toroidal CVT for four-wheel drive

A double cavity half-toroidal CVT has two variators, which gives a hint of a new four-wheel drive without a center differential gear unit by applying each of them to drive front and rear drive shafts independently. Torque re-circulation at cornering or different tire radii between front and rear tire is avoided by compensating the speed ratio of variator. The controller adjusts the attitude angle of power roller of the front variator against the rear by measuring the steering angle at cornering. This paper describes the speed ratio control system of the 4WD-CVT with speed ratio range of 1 : 8.7 and test results of vehicle motion mounted on a 3.2L RV.     

门式双排抗滑桩设计计算方法及工程应用研究

门式双排抗滑桩是一种较为新型的支护结构,首先考虑前、后桩及连系梁作用,推导了滑坡推力作用下双排抗滑桩桩间土压力计算公式;然后,针对门式双排抗滑桩受力特点,将抗滑桩划分为受荷段与嵌固端,采用工程中常用的地基系数“m-k”法推导了各特征段的微分方程,在此基础上,根据前、后桩及连系梁的边界条件,利用有限差分方法对微分方程求解,建立了门式双排抗滑桩内力及位移计算方法.工程实例分析验证了该方法的可行性,可为类似工程设计提供参考.     

日野ZY240H载货自卸车制动系统

日野ＺＹ２４０Ｈ２０吨自卸车的制动系统采用双回路独立全气压式工作系统，前轮和后轮制动各用一个独立执行气压制动回路，前桥和后桥后轮采用膜片制动气室，后桥前轮设置了弹簧储能复合制动气室，又设置了一套手动控制的制动系统，作为紧急制动系统失效后的第二种制动方法。另外，还有排气缓速装置和机械手制动，详细介绍了该系统的工作原理和主要部件的功用。     

摩擦片式防滑差速器转矩特性对汽车操纵稳定性的影响研究

进行了摩擦片式防滑差速器防滑转矩输出特性测定试验,并分别对装有摩擦片式防滑差速器和普通差速器的汽车,通过试验测定的车厢侧倾角、转弯半径比、前后轴侧偏角差值、横摆角速度及侧向加速度作为对比参数,研究了摩擦片式防滑差速器转矩特性对汽车操纵稳定性的影响。结果表明,摩擦片式防滑差速器能够显著提高汽车的动力性、通过性,改善汽车的操纵稳定性。     

Effect of Frame Compliance on the Lateral Dynamics of Motorcycles

The lateral dynamics of an uncontrolled motorcycle, running on a straight, level road surface, is investigated in this paper. The structural compliances in the front and the rear frames of the motorcycle are taken into account by introducing additional degrees of freedom in the analysis. The kinematics of the tires is represented by linear differential equations which are based on the taut-string model of pneumatic tires. The linear differential equations of motion are solved to yield the eigensolutions of the system. Numerical results, obtained for parameters corresponding to a Honda CB750 motorcycle, are presented and discussed.     

Effect of Frame Compliance on the Lateral Dynamics of Motorcycles

SUMMARY

The lateral dynamics of an uncontrolled motorcycle, running on a straight, level road surface, is investigated in this paper. The structural compliances in the front and the rear frames of the motorcycle are taken into account by introducing additional degrees of freedom in the analysis. The kinematics of the tires is represented by linear differential equations which are based on the taut-string model of pneumatic tires. The linear differential equations of motion are solved to yield the eigensolutions of the system. Numerical results, obtained for parameters corresponding to a Honda CB750 motorcycle, are presented and discussed.