Browse Topic: Transmission linkages

Items (2)

Contribution of the Mechanical Linkage in Gear Shift Feel of North-South Transmission

10/8/2017

Today’s automotive industry is facing cutthroat competition, especially in passenger vehicle business. Manufacturers around the globe are developing innovative and new products keeping focus on end customer; thus customer's opinion and perception about the product has become a factor of prime importance. Customer touch points such as gear shift lever, clutch, brakes, steering etc. are thus gaining more and more importance. Car companies are trying to induce more and more luxuries in these touch points so that they impress customer and create a positive opinion about the product. On the other hand manufacturers are also trying to manage profits. Companies thus need to find the best fit solution for improvising customer touch points with optimized costs. The performance of these touch points is driven by subsystems of mechanical components like mechanical linkage. Quality, functioning and durability of these mechanical component subsystems play a significant role in performance of touch points like gear shift lever. During development of 6-Speed North-South transmission, we came across some facts indicating the relation between the performance of mechanical shifting linkage system and gear shift feel of the car. Mechanical linkage stiffness, free play and efficiency are the parameters playing a vital role in its functioning and thereby gear shift feel. In this paper a case study is discussed mentioning work related to improvement in the mechanical linkage for improving gear shift feel. The paper explains learning's about mechanical linkage kinematics, force calculations and transformations, mechanism models we worked on, the interrelations between linkage parameters and how these help to improvise gear shift feel. Discussion is made on noise, vibrations, shift lever rattle cause and effects, the role of mechanical linkage in all these. Optimization of linkage stiffness, weight, inertia and angles between links with help of Creo-simulation model is described and the conclusion is drawn in the end.

Deshmane, Santosh, Gurav, Onkar P., Sahu, Vipul

Precise Steering Angle Control of Lane Change Assist System

2017-01-2002

9/23/2017

After obtaining the optimal trajectory through the lane change decision and trajectory planning, the last key technology for the automatic lane change assist system is to carry out the precise and rapid steering actuation according to the front wheel angle demand. Therefore, an automatic lane change system model including a BLDCM (brushless DC motor) model, a steering system model and a vehicle dynamics model is first established in this paper. Electromagnetic characteristics of the motor, the moment of the inertia and viscous friction etc. are considered in these models. Then, a SMC (Sliding Mode Control) algorithm for the steering system is designed to follow the steering angle input. The control torque of the steering motor is obtained through the system model according to steering angle demand. After that, the control current is calculated considering of electromagnetic characteristics of the BLDCM. Debugging and optimization of the control algorithm are done through simulations. Also, different steering input and uncertain disturbance torque are successively loaded on the simulation model to test the tracking performance and robustness of the control algorithm. Simulation results are compared with the PID’s and show that under different steering inputs, the steering system with the proposed controller manifests a better tracking performance. Even if large parameter uncertainties are taken into consideration, tracking error will not be enlarged obviously, which indicates that the SMC has good robustness. These results can provide reference for precise steering angle control of the automatic lane change assist system by considering of different parts of the steering system, steering motor, steering transmission linkage, and steered wheels.

Wang, Yang Yang, Chen, Guangda, Ao, Xuanjing, Fan, Shuhao, Mei, Han, Li, Wei

Items per page:

1 – 2 of 2