Using this information, it balances the amount of power delivered to each of the two front wheels. Ford debuts awd system with dynamic torque vectoring control. Since its appearance in 2011, electric cars have consistently been in the top position every year. Lexus rcf torque vectoring differential, how does it. Pdf electric torque vectoring for electric vehicles. Ford tech features torque vectoring control ford philippines. Torque vectoring has become something of an industry buzzword, and ford has demonstrated that it is no slouch in marketing its new technology, even when that technologys newness is contestable.
This paper deals with the description of current and future vehicle technology related to yaw moment control, antilock braking and traction control. I am a student hoping to develop a torque vectoring system for a rc car using 4 motors. On an awd vehicle torque vectoring only differs from esc system in software i. The mazda6 midsize sedan and wagon and the cx5 softroader are next in line to take in the changes, before every model all the way through to the mx5 sportster gets the technology. Tvc helps the lincoln mks drive through corners with greater balance and poise. Inwheel motor torque vector abs esc eba aeb on vimeo. Bends throw up the odd surprise for any driver, forcing you to make sudden corrections that compromise grip and control. Dec, 20 this worldclass gravelchucker employs a torque vectoring system that actively splits torque based on inputs from accelerometers as well as steering angle, brake force, and throttle position sensors.
This paper focuses on this aspect and discusses the. By controlling the power across the axle more effectively, the car is able to corner with more grip and turn into a bend. Torque vectoring control uses the same sensors as traction control which will detect when a wheel is going to spin. Fords 2012 focus is the newest vehicle to include torque vectoring. The torquevectoring system uses sensors to help get power to the road in a meaningful way that limits under steer and wheel slippage. Quickly controlling the torque applied to the wheels independently. Braking pressure is applied calmly to make the speed of the wheel back to what it should be. To answer your question, on most fwd cars, the torque vectoring traction control will cut power to the drive wheels when it senses slipping. Continuously variable transmission with torque transfer shaft is used and, in comparison with solutions with clutches, significant energy saving is obtained. This method of power transfer has recently become popular in allwheel drive vehicles. 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.
Take a corner too fast and understeering may occur, especially in frontwheeldrives, causing your vehicle to slide to the outside edge of the turn, rather than going in the direction you want to go. Esc activates brakes only after sensors have detected that vehicle has lost grip. A solution to perform torque vectoring without clutch technology is presented in 8. Torque vectoring technology provides the differential with the ability to vary the torque to each wheel. Torque vectoring control reacts to the road surface 100 times per second. As much as 100% of the available torque can be sent to an individual wheel with some setups. This worldclass gravelchucker employs a torque vectoring system that actively splits torque based on inputs from accelerometers as well as steering angle, brake force, and throttle position sensors. Vehicle torque vectoring control university of waterloo. We are writing about mazdas first torque vectoring solution, which has been designed to provide a higher level of comfort for the occupants of its models. Each manufacturer does it a little differently, and to varying degrees, but you will always get a startstopstartstop kind of stuttering when it kicks in. Development and implementation of a torque vectoring.
Lincoln mks overview torque vectoring control drivers are most likely to notice lincolns new torque vectoring control tvc system when lincoln drive control is set to sport mode. 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. As the inside is braked, more power is sent to the outside wheel mimicking the rotational effect a torque vectoring differential applies to a car known as yaw. 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. Fst06e electric vehicle developing a torque vectoring system can be. The front end hugs every corner for improved traction and handling when accelerating through corners. The torquevectoring drive also acts like a positivetraction or locking differential on dry or uneven traction startups, with torque going to the wheel with higher friction potential. Torque vectoring for a formula student prototype tecnico lisboa. Ford focus rs torque vectoring control how it works. To put it simply, torque vectoring is a computercontrolled system which controls power across the axle. Dec 07, 2010 designed to help the front wheels grip and steer better in corners. This maximises grip and sharpens handling, helping you round corners and over undulations in the road. This pass week i came to the conclusion that i dont like the torque vectoring feature. 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.
The torsenbased quattro system also offers an advantage, in the opposite function of distributing torque to the road wheels, namely engine braking. With the torque vectoring rear differential unit zf vectordrive zffriedrichshafen developed an intelligent actuator for control of driving dynamics to improve agility, traction and safety. Torque vectoring is a technology employed in automobile differentials. 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 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. This system uses lateral accelerometers, yaw sensors, steering angle input and wheel speed sensors as inputs to the vehicle stability control computer. This video will help explain what torque vectoring control is and how it works if you encounter adverse road conditions. Mazda gvectoring tech aims to improve frontwheel grip. What links here related changes upload file special pages permanent link page information wikidata item cite this page. Torque vectoring is a vehiclecontrol system used for cornering and lateral movements, and also results in easier handling for the driver. Oct 01, 2009 the torque vectoring drive also acts like a positivetraction or locking differential on dry or uneven traction startups, with torque going to the wheel with higher friction potential. Ford torque vectoring control haynes ford transit centre. It can prevent tyre wear and is sure to enhance car handling abilities.
Developed in consultation with ken block, the thirdgen ford focus rs combines a powerful 2. Torque vectoring control ford technology ford kuwait. It determines how much of the engines power is sent across the left and right sides of a car. 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 housing, thus altering the amount of torque sent to each wheel. Oct 05, 2016 torque vectoring is a new technology employed in automobile differentials. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The traditional open differential is like a 1980s office drone. The power distribution on the rear wheels is the simplest example of that. Monitoring the vehicle a 100 times a second, the system detects when the front inside tire starts to slip on the road surface. Fords system gathers data from vehicle sensors to apply nominal braking force to the wheel with the least amount of traction generally the one. Ford tech features torque vectoring control ford new. Light brake force is applied to the front inside wheel as soon as it begins to lose grip, sending more engine torque to. Because each sensor has a specific resolution and format, it is.
Up to 100 percent of torque can be distributed to the rear axle and 100 percent then. Jul 14, 2016 we are writing about mazdas first torque vectoring solution, which has been designed to provide a higher level of comfort for the occupants of its models. 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. Dynamic torque vectoring reads the road conditions and driving situation to distribute torque around the vehicle, monitoring the conditions including steering angle, yaw, speed and lateral acceleration at 100 times a second using intelligent vehicle sensors. Developers are increasingly focusing on torque management to improve longitudinal and lateral dynamics and to enhance the vehicles characteristics. Torque vectoring is a new technology employed in automobile differentials. Torque vectoring for electric vehicles with individually. Torque vectoring technology is generally defined as a vehicles ability to vary the power to each wheel. Torque as a vector quantity the vector or cross product is another way to combine two vectors. Stability control and torque vectoring systems modified. Lexus rcf torque vectoring differential, how does it work.
When engine braking is used to slow the car down, with torsenbased systems, the resulting reverse torque loads on the front and rear axle are equally stabilized, in exactly the same way that engine propulsion torque is apportioned fully. Ford tech features torque vectoring control ford new zealand. 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. Torque as a vector quantity apache2 ubuntu default page. What a difference lexus torque vectoring differential. Unfortunately, they are also less intuitive and harder to control because of their. 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. Originally developed for sports vehicles to avoid the need for a limited slip differential and other costly components, it. Benefits of individual wheel torque control, or torquevectoring, in terms of vehicle dynamics behavior have been well documented in the literature. Put simply, its a computercontrolled system to distribute an engines power across the left and right sides of a car.
For the automoti ve industry, torque vectoring tv is a modern concept to enhance driving stability and safet y whilst improving vehicle dynamics or the funtodrive. A differential transfers engine torque to the wheels. Subarus 2015 wrx gets smarter with torque vectoring. What a difference lexus torque vectoring differential makes. In vector form, torque is the cross product of the radius vector from axis of rotation to point of application of force and the force vector. Fords torque vectoring control, introduced to north american buyers on the 2012 focus, is an electronic solution to wheel slippage. Automotive torque vectoring market by technology atvs and ptvs. The main objective was to implement torque vectoring in the bristol electric racing car to improve the vehicles lateral dynamics hence, reduce the lap times in the formula student events. Known as torque vectoring through braking known as xds in volkswagen group cars, the system brakes the inside wheel during a turn. To answer your question, on most fwd cars, the torque vectoringtraction control will cut power to the drive wheels when it senses slipping. Hi guys new to the sight signed up to ask the community some questions. To know about the assumptions considered for the study, download the pdf brochure. Smart cornering gforces naturally transfer more traction to your outside wheels than your inside ones in a corner. Vehicle torque vectoring control ece 1635 april 6, 2015 christopher au moeed siddiqui yujie guo.
Development and implementation of a torque vectoring algorithm for an innovative 4wd driveline for a highperformance vehicle. What a difference lexus torque vectoring differential makes by justin banner october 15, 2015 whenever we hear about a new technology on a car that claims to make a difference over the same car without it, its kind of hard to verify that claim. It is well known that rearwheel drive rwd vehicles are more fun to drive and faster in their reactions. Torque vectoring for an electric vehicle using an lpv drive controller and.
The old revoknuckle suspension system was fine for mitigating torque steer on the previous frontwheel. Using the braking system to imitate the effect of a torque vectoring. 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. Designed to help the front wheels grip and steer better in corners. Heres our guide with minimal jargon to what torque vectoring is and what benefits it offers to a car and driver. Ford developed the dynamic torque vectoring system to give it the ideal handling characteristics, and work alongside the complex allwheeldrive system to produce allwheeldrive traction with rearwheeldrive handling matched with incredible cornering speed, agility and grip. The limitedslip differential is like that obnoxious it guy down the hall, justifying its attitude and flaws by doing what the open differential cannot.
Electric vehicle, vehicle performance, braking, traction control, european union 1 introduction. Using the braking system to imitate the effect of a torque vectoring differential, torque vectoring control steps in before wheel spin occurs. There seems to be a moment where the systems kicks in and the car tightens the driving line even thought i dont want it to. The design goals for a torque vectoring controller are good response behavior, high accuracy, and linear behavior of the car during high loads. Torque vectoring control balances braking and speed for improved handling. Mazda launches its first model with torque vectoring for. The ford focus rs kickass awd system will show up on. Florian and vincent create the optimal controller by combining. Ford debuts awd system with dynamic torque vectoring. In this paper, a conception of the torque vectoring differential which use electric motor and a gear set.
Yes it helps the car turn and tightens the line, very impressive. Torque vectoring has made a big impact on formula student events. Oct 15, 2015 what a difference lexus torque vectoring differential makes by justin banner october 15, 2015 whenever we hear about a new technology on a car that claims to make a difference over the same car without it, its kind of hard to verify that claim. When engine braking is used to slow the car down, with torsenbased systems, the resulting reversetorque loads on the front and rear axle are equally stabilized, in exactly the same way that engine propulsion torque is. The proposed solution resorts to a pi controller for yaw rate tracking with. Torque vectoring control howto video official ford.
Torque vectoring is a phrase you may have heard while researching your next car, but what is it. Torque vectoring torque vectoring is a stability control system which improves the performance and stability of a vehicle when cornering, due to the. The basis of all ricardo concepts is the use of a actuator with a low torque. Design and implementation of torque vectoring in the. Torque vectoring technology provides the differential with the ability to vary the power to each wheel. Called gvectoring, the software will be fitted to each new model as it is due for an update. Nov 20, 20 the torquevectoring system uses sensors to help get power to the road in a meaningful way that limits under steer and wheel slippage. Torque vectoring control howto video official ford owner. Torque vectoring tv is a widely used technique to achieve stability control for independent wheel drive electric vehicle due to its velocity maintaining performance.
The sporting spirit that characterises a highperformance car can be observed in certain technical solutions. I was reading about the lexus rcf and how it has a torque vectoring differential and how this differential has the ability to put more torque on the outer turning wheels rather than on the inside wheels which seems to be a common differential issue and a problem engineers have had difficulty staying within cost containment controls. Its tied into an allnew electric power steering system. However, very few studies exist which analyze the individual wheel torque control integrated with vehicle efficiency considerations. New generation subaru wrx sti feature a comprehensive suite of accident avoidance technologies, including a. Light brake force is applied to the front inside wheel as soon as it begins to lose grip, sending more engine torque to the outside wheel that has more grip.
497 687 1476 1337 1043 118 189 918 1332 423 819 354 453 1449 729 946 751 1094 377 141 992 448 1113 1125 1321 148 917 481 731 1352 1392 1454 1277 1299 1499 516 601 641 1264 59