A safe torque vectoring function for an electric vehicle. Can allwheel torque vectoring replace mechanical steering. In particular, the adoption of individually controlled electric powertrains with the aim of tuning the vehicle dynamic characteristics in steadystate and transient conditions is discussed. Torque vectoring control reacts to the road surface 100 times per second. How does toyota rav4 dynamic torque vectoring awd work. Control allocation based optimal torque vectoring for 4wd. Torque vectoring is a vehiclecontrol system used for cornering and lateral movements, and also results in easier handling for the driver. Company 2 to describe a means of varying the distribution of engine torque between two. Ford focus rs torque vectoring control how it works.
Dec 07, 2010 ford torque vectoring control ford europe. Development of an advanced torque vectoring control. The function utilises the braking system to replicate the effect of. Torque vectoring control howto video official ford. The front end hugs every corner for improved traction and handling when accelerating through corners. Traction control is a control system, which extends the abs system. The ability to tune yaw behavior via torque vectoring can potentially eliminate compromise between response and stability.
Pdf energy efficient torque vectoring control basilio. A torque vectoring device for a vehicle is provided, comprising an electrical motor 110 being connected to a differential mechanism 20 via a transmission 120, wherein the torque vectoring device further comprises at least one control means, 150 for changing the torque path of the transmission 120 between a first mode, in which the transmission connects the electrical. Torque vectoring control howto video official ford owner. Control when you need it torque vectoring control increases traction in the direction you want to travel and improves the steering ability of the inside tire. Many automotive connoisseurs who have come to love the toyota crossover may want to. Its designed to improve handling, stability, and performance and its a feature that is becoming more and. By adopting a torque vectoring mechanism, which independently distributes torque to the left and right rear wheels according to driving conditions, the dynamic torque vectoring awd system enables the driver to steer the vehicle exactly as intended. The design goals for a torque vectoring controller are good response behavior, high accuracy, and linear behavior of the car during high loads. Gkn automotives etwinster dualclutch transmission and the companys software and control modules make torque vectoring easy to integrate into the driving experience. An optimal torque vectoring control for vehicle applications via. An optimal torque vectoring control for vehicle applications. Tire forces are at the heart of the dynamic qualities of vehicles.
Torque vectoring control vs limited slip differential. For an electric single wheel drive, a con tinuous control intervention is feasible 7, 8 as the electric motors are continuously controlled anyways. This is especially important for sports cars and offroad vehicles. The detailed control system of the torque vectoring is described in the doctoral thesis of dr. Mazda launches its first model with torque vectoring for.
Gkn automotive systems and solutions electric drive. Pdf electric torque vectoring for electric vehicles. An optimal torque vectoring control for vehicle applications via realtime constraints dhanaraja kasinathan, alireza kasaiezadeh,andy wong, amir khajepour, shihken chen, and bakhtiar litkouhi abstracta generalized integrated control strategy for vehicle dynamics using an optimal torque vectoring control approach is extended in this paper. This video will help explain what torque vectoring control is and how it works if you encounter adverse road conditions. In this paper, modelbased development of a control of torque vectoring differential tvd gear system is described.
Torque vectoring tv is a widely used technique to achieve stability control for independent wheel drive electric vehicle due to its velocity maintaining. This was achieved based on the principal of distributing total driver requested torque between wheels, equivalent to the. This article presents a comparison between different torquevectoring control structures for the yaw moment control of. The torque vectoring algorithm distributes the yaw moment among the four wheels. Nov 20, 2015 so what are the disadvantages of a torque vectoring active differential. This allows each wheel to receive independent torque amounts. Torque vectoring for electric vehicles with individually. There are several all wheel drive systems that can regulate the torque that is sent to the wheels but these systems do this to maintain traction on various road surfaces. Audi produced a torque vectoring system capable of varying the torque received by any wheel of the vehicle. A limitedslip differential, or lsd, allows the driven wheels of a car to spin at different speeds. Development of an advanced torque vectoring control system for an electric vehicle with inwheel motors using soft computing techniques. Well, some systems do not work offthrottle and this is where that brakebased torque vectoring comes in handy.
This paper deals with the description of current and future vehicle technology related to yaw moment control, antilock braking and traction control. The new dynamic torque vectoring awd system is used in gasoline engine vehicles. This system controls the braking fluid pressure during the full break request. Developers are increasingly focusing on torque management to improve longitudinal and lateral dynamics and to enhance the vehicles characteristics. This maximises grip and sharpens handling, helping you round corners and over undulations in. Torque vectoring is a method used to enhance the on road handling and performance during cornering by altering the distribution of torque between the left and right rear wheels. Vehicle torque vectoring control ece 1635 april 6, 2015 christopher au moeed siddiqui yujie guo. Design and analysis of a new torque vectoring system with a. Simulation study investigating the novel use of drive torque vectoring for dynamic postimpact vehicle control peter samuel delves a thesis submitted in partial fulfilment of the requirements of the manchester metropolitan university for the degree doctor of philosophy school of engineering manchester metropolitan university 2015. That, well cover active torquevectoring systems specifically brakebased systems vs. Torque vectoring control driverassist technology autolamp automatic onoff headlamps seating front bucket seats 6040 splitfold rear bench seat with recline interior 12v powerpoints 4 cargo tiedown hooks 4 display message center with trip computer displays compass and outside temperature front 2 and rear 2 grab handles. Esc activates brakes only after sensors have detected that vehicle has lost grip. As mentioned rimac has demonstrated that all wheel torque vectoring can deliver unprecedented precision in control of individual wheels.
Tvc helps the lincoln mks drive through corners with greater balance and poise. Index termsactiveset methods, constrained optimization, differential braking, integrated control, optimal torque vectoring control. The function has been embedded in a lean and scalable functional architecture adaptable to various drivetrain concepts. Vehicle torque vectoring control university of waterloo. Torque vectoring for electric vehicles with individually controlled. Integrated torque vectoring and power management framework. New dynamic torque vectoring awd and efour 4wd systems. The technology improves both on and offroad performance, by enhancing traction, cornering and efficiency in realworld driving conditions. Pdf development of torque vectoring differential control. Using this information, it balances the amount of power delivered to each of the two front wheels.
The bmw torque vectoring system is called dynamic performance control. Pdf development of an advanced torque vectoring control. The evaluation of the vehicle dynamic simulation has shown that the best results regarding the control quality can be reached by using the fuzzy control algorithm to optimize the driving stability in extreme driving situations. By transferring power towards the wheel that has more traction in a given situation, overall control and handling are improved. Feb 26, 2018 the new dynamic torque vectoring awd system is used in gasoline engine vehicles. Fords torque vectoring control, introduced to north american buyers on the 2012 focus, is an electronic solution to wheel slippage. A standard production car could employ a simplified version of their control approach with fewer sensors and feedback loops but with the addition of a steering algorithm. Ford tech features torque vectoring control ford philippines. Results show that the proposed intelligent torque vectoring system is able to increase the efficiency of the vehicle by 10%, thanks to the optimal torque distribution and the use of a neurofuzzy vertical tire forces estimator which provides 3 times more accurate estimations than analytical approaches. Unlike a mechanical limited slip differential, which focuses on two wheels only and induces an artificial steering feel, the torque vectoring control encompasses all 4 wheels. An investigation on the robustness of a torque vectoring control based on an inverse disturbance observer architecture for a rear wheel driven vehicle. A special transmission unit is used in the experimental car mute of the technical university of munich, where the bigger motor is providing the driving power and the smaller for the torque vectoring functionality.
Torque vectoring is a system that allows cars to control how certain wheels get power. Experiments with a fourwheeldrive electric vehicle show that considerable energy savings can be achieved by considering drivetrain and tire power losses through energy efficient torque vectoring control. In the present paper, a realtime integrated torque vectoring control function is designed and implemented in an awd axlesplit hybrid vehicle. Torque vectoring usually refers to the ability to actively control how an engines power is distributed between a vehicles wheels typically between two wheels on the same axle, in order to help improve vehicle. Research of model matching control of torque vectoring. With the advent of electric vehicles the precise and accurate control of the traction and braking forces at the individual wheel becomes a possibility and a reality outside test labs. Review and simulation of torque vectoring yaw rate control.
Suspension characteristics could be tuned to benefit ride and fuel economy, while torque vectoring generates the desired response. Originally developed for sports vehicles to avoid the need for a limited slip differential and other costly components, it is. In this thesis, a torque vectoring control strategy is proposed for the. Drivers are most likely to notice lincolns new torque vectoring control tvc system when lincoln drive control is set to sport mode. Torque vectoring technology is generally defined as a vehicles ability to vary the power to each wheel. Intelligent torque vectoring approach for electric vehicles with per. Some of the popular torque vectoring systems are hondaacuras unique super handlingall wheel drive on several of their their models, bmws dynamic performance control on the x6, audis quattro with sports differential and nissans torque vectoring on the juke. Torque vectoring is a vehicle control system used for cornering and lateral movements, and also results in easier handling for the driver. Torquevectoring stability control of a four wheel drive. Unlike other torque vectoring systems, the gvectoring control works through the engine by limiting torque developed at certain points, especially during specific steering inputs, which are pre.
To provide excellent turning performance, lexus engineers developed and adopted torque vectoring differential tvd technology for a frontengine rearwheeldrive fr vehicle for the first time in the world first tvd for toyota motor corporation that performs electronic control to actively transfer torque to right and left rear wheels. On an awd vehicle torque vectoring only differs from esc system in software i. The torquevectoring algorithm distributes the yaw moment among the four wheels. The torque vectoring function comprises an lpv control algorithm with good. Torque vectoring is the term introduced by the ricardo. A torque vectoring differential acts very similarly to an open differential, except the axle shafts have planetary gearsets and clutch packs which allow them to lock up with the differential.
In particular, the adoption of individually controlled electric powertrains with the aim of tuning the vehicle dynamic characteristics in steady. The hypersmart, fuelefficient future of allwheel drive oct 1, 2009 everyone knows there are control and capability benefits of allwheel drive when youre dealing with the. Active torque vectoring for all wheel drive fsae electric car by vikas tukaram pawar presented to the faculty of the graduate school of the university of texas at. Intelligent torque vectoring approach for electric vehicles. Simulation study investigating the novel use of drive. Active torque vectoring for all wheel drive fsae electric car by vikas tukaram pawar. Development of torque vectoring differential control ecu. Numerical simulation studies have been conducted to evaluate the proposed optimal torque vectoring algorithm. Intelligent torque vectoring approach for electric.
Active torque vectoring systems for electric drive vehicles cvut. An integrated vehicle control framework is presented, which uses torque vectoring across independently driven wheels for control. The approach is general in nature, but is particularly well suited for electric vehicles due to increased control bandwidth. Feb 01, 2015 a torque vectoring differential acts very similarly to an open differential, except the axle shafts have planetary gearsets and clutch packs which allow them to lock up with the differential. A safe torque vectoring function is applied to an electric vehicle with a two front motors drivetrain concept. Simulation study investigating the novel use of drive torque. An optimizationbased control allocation method is used to determine the actuator command in order to apply the desired traction force, the yaw moment input and the wheel slip control inputs to the test platform. Torque vectoring control select a different vehicle to begin a new search this video will help explain what torque vectoring control is and how it works if you encounter adverse road conditions. Research of model matching control of torque vectoring differential gear system. The basis of all ricardo concepts is the use of a actuator with a low torque. In fourwheel drive vehicles in particular, it is no longer simply a matter of distributing torque to the individual axles but also to the individual wheels. Jul 14, 2016 unlike other torque vectoring systems, the g vectoring control works through the engine by limiting torque developed at certain points, especially during specific steering inputs, which are pre. Torquevectoring control for fully electric vehicles.
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