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. Perform a complete valve body rebuild on a zf 4hp22eh transmission with e9 7 pin, 4 solenoid valve body, in order to improve shift quality, and eliminate some anomolous behaviors of this notorious transmission. Ford tech features torque vectoring control ford philippines. This maximises grip and sharpens handling, helping you round corners and over undulations in the road. If the eps were to fail, this could be compensated for in a targeted fashion with the assistance of the akc or torque vectoring, in order to safely steer the vehicle to the side of the road in an emergency situation. Esc activates brakes only after sensors have detected that vehicle has lost grip. Torque vectoring is a technology employed in automobile differentials. This system gives more power to the outher wheel in a curve to make the car more agile for more information visit. An active model based torque vectoring system controller is designed to realize. The torque vectoring hardware units produced by gkn driveline will be supplied to system leader zf, who is responsible for the final assembly of the system and the supply of the electric motors. A discretetime controller design is proposed and the. F11 year engine dia hub spl pilot mount pilot center to bolt center stall 199197 10 781. Oct 15, 2014 torque vectoring transmissions are used today in select top model cars and sports cars with combustion engines.
Also known as the quaiffe or torque vectoring diff, the tbd is a different animal entirely from the clutchtype. Developers are increasingly focusing on torque management to improve longitudinal and lateral dynamics and to enhance the vehicles characteristics. The torque vectoring system does not interfere with any driving or braking movements carried out on the car whilst it is in use including acceleration and deceleration. Pdf torquevectoringbased backup steering strategy for steer. Torque vectoring function is achieved through an additional assembly comprising of the differential gear set and motor. Automotive supplier zf has created a new torque vectoring rear axle drive system that has been designed to distribute drive torque individually between a cars rear wheels. Torque vectoring for electric vehicles with individually. T v2 torque loss on driven gear 2 a w service pressure angle t n2 nominal torque on driven gear 2. Zf is one of the largest automotive suppliers worldwide. Pdf this paper concentrates on the torque commands for electric propulsion motors in a through the road hybrid electric vehicle. 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. Design and analysis of a new torque vectoring system with a.
Mazda launches its first model with torque vectoring for. 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. Dec 07, 2010 designed to help the front wheels grip and steer better in corners. Since this solution does not use friction components it is efficient and durable. Torque vectoring is a vehiclecontrol system used for cornering and lateral movements, and also results in easier handling for the driver. 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. Torque vectoring for improved driving market my article. A torque vectoring differential is presented in this paper. Veit held, opel automobile gmbh axel honisch, hyundai motor europe technical center gmbh. Energy efficient torque vectoring control university of surrey. Fords torque vectoring control, introduced to north american buyers on the 2012 focus, is an electronic solution to wheel slippage. Bends throw up the odd surprise for any driver, forcing you to make sudden corrections that compromise grip and control. Chapter7discusses real test drives, which demonstrate the performance improvements achieved with torque vectoring, as compared to an equal. In order to benefit from the advantages without suffering the above mentioned.
Torque vectoring control reacts to the road surface 100 times per second. Here the torque is distributed variably and asymmetrically to the left and right wheels on the rear axle. Its tied into an allnew electric power steering system. Torque converter identification catalog tcs products. Further advantages are offered by torque vectoring systems, such as the zf. Oct 01, 2009 german transmission and driveline company zf has also developed a torquevectoring system, called vector driveand its ready for volume production in allwheel and rearwheel drive vehicles. This paper focuses on this aspect and discusses the. A differential transfers engine torque to the wheels. A tbd is architecturally identical to an open diff, but uses spiral or helical cut pinion gears. However, manual c conversion limits increases time for modification of. Put simply, its a computercontrolled system to distribute an engines power across the left and right sides of a car. The front end hugs every corner for improved traction and handling when accelerating through corners. Zf claims broadest portfolio of hybrid and electric drive 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.
Vehicle torque vectoring control ece 1635 april 6, 2015 christopher au moeed siddiqui yujie guo. The aim of the researchers was, thus, to optimize the transmission for small vehicles with electric drives. Emerging technologies and market trends in automotive transmissions. However, very few studies exist which analyze the individual wheel torque control integrated with vehicle efficiency considerations. How to minimize power losses in transmissions, axles and. Corner traction control by torque vectoring roll stability control system five 3. Pdf steerbywire sbw systems provide significant benefits to classical vehicles, and are indispensable for fully autonomous vehicles. Zf aftermarket offhighway torque converters you will find torque converters for your construction vehicles here. Besides the main driving machine a second smaller superimposing electric motor combined with a superimposing gear makes it possible to recuperate brake energy for all driving situations. This paper describes how such a rear axle torque vectoring system can be. 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. F35, a9, 156208, 1562080802, 73, a9, b52, k73, y61 some t45, 2. With the vector drive rear axle transmission, zf generates such a torque vectoring system at the rear axle. The hybrid systems described here combine not only the allelectric.
The design goals for a torque vectoring controller are good response behavior, high accuracy, and linear behavior of the car during high loads. When one wheel starts rotating faster than the other, the spiralcut gears sort of jam against the case and axle gears. Torque vectoring for an electric vehicle using an lpv drive controller and a torque. Subarus 2015 wrx gets smarter with torque vectoring. Standard and limited slip hemispheres are included as part of the offering. Originally developed for sports vehicles to avoid the need for a limited slip differential and other costly components, it is. Zf 35 code n19 trans zf4hp18 saab 9000 year engine dia hub spl pilot mount pilot center to bolt center stall 1995 10 1516 1. Pdf torque vectoring with a feedback and feed forward controller.
This maximises grip and sharpens handling, helping you round corners and over undulations in. Torque converter, zf5hp19 au dcsa8 torque converter, zf5hp19, codes. The vector drive rear axle transmission springerlink. Oct 05, 2016 torque vectoring is a new technology employed in automobile differentials. Zf claims to now offer the broadest range of hybrid and allelectric drive solutions. Using this information, it balances the amount of power delivered to each of the two front wheels. Due to their high cost and additional weight, torque vectoring transmissions have not yet found application in electric vehicles. Fords 2012 focus is the newest vehicle to include torque vectoring. 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. Benefits of individual wheel torque control, or torquevectoring, in terms of vehicle dynamics behavior have been well documented in the literature. Please choose the appropriate category in order to find the product overview.
Nov 20, 2015 so what are the disadvantages of a torque vectoring active differential. Simulation derives a pure drag torque related saving potential of 5. Therefore, zf developed the advanced urban vehicle, a test. Torque vectoring is a phrase you may have heard while researching your next car, but what is it. Monitoring the vehicle a 100 times a second, the system detects when the front inside tire starts to slip on the road surface. 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. Zf is a global leader in driveline and chassis technology as well as active and passive safety technology. By controlling the power across the axle more effectively, the car is able to corner with more grip and turn into a bend. Lexus rcf torque vectoring differential, how does it. 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. 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. The relative torque balance loss can be calculated v for any point on the line of contact with the following equation ref. The basis of all ricardo concepts is the use of a actuator with a low torque.
Zf service manuals and parts catalogs instant download. Zf annually invests about six percent of its sales in research and development ensuring continued success through the design and engineering of innovative technologies. Torque vectoring technology provides the differential with the ability to vary the power to each wheel. Different torque vectoring differential tvd patents have been revealed by car companies and suppliers, such as ford, zf, and honda recently. Development and evaluation of a torquevectoring algorithm on. Torque vectoring electronic chassis systems innovative systems. Quickly controlling the torque applied to the wheels independently.
Development of torque vectoring differential control ecu. Please submit documents in pdf or microsoft word format. Torque vectoring control balances braking and speed for improved handling. This system uses lateral accelerometers, yaw sensors, steering angle input and wheel speed sensors as inputs to the vehicle stability control computer. 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. Most recentmodel allwheel drive vehicles cars and suvs already come with some kind of computermanaged system in order to boost fuel efficiency. 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 transmission for electric vehicles. The nonlinear model that uses a torquevectoring dual clutch tvdc is com pared to. Lexus rcf torque vectoring differential, how does it work. Further advantages are offered by torque vectoring systems, such as. Torque vectoring is the next step in awd, its contribution being that it can get power to any wheel nearly instantly without having to use the brakes or cut power. Jun 16, 2007 automotive supplier zf has created a new torque vectoring rear axle drive system that has been designed to distribute drive torque individually between a cars rear wheels. A disadvantage of the design shown in figure 2 is the low ratio between the actuator torque and the differential torque, as well as the corotation of the actuator around the wheel axles.
Further advantages are offered by torque vectoring systems, such as the zf vector drive rear axle drive unit. Torque vectoring technology is generally defined as a vehicles ability to vary the power to each wheel. On an awd vehicle torque vectoring only differs from esc system in software i. Torque converters for construction vehicles zf aftermarket. Well, some systems do not work offthrottle and this is where that brakebased torque vectoring comes in handy. Zf 451 technical data sheet zf 45 series product details description reverse reduction marine transmission with hydraulically actuated multidisc clutches robust design with cast iron housing withstands continuous duty in workboat applications fully works tested, reliable and simple to install design, manufacture and quality control standards comply with iso 9001. Goaldirected utilization of active torque distribution to the four drive wheels has become increasingly important in the last few years, especially with a view to improving both driving dynamics and traction. 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.
Torque vectoring technology provides the differential with the ability to vary the torque to each wheel. Zf axle drives are robust, comfortable in terms of power transmission and with innovative and. Now substituting the values in left hand side of above equation. Are torque converters ever used in manual transmissions. Zfs new torque vectoring rear axle motor authority. When the torque is applied to the front wheels of the vehicle, the control system engages increased steering reaction force. With the torque vectoring rear differential unit zf vectordrive zf friedrichshafen developed an intelligent actuator for control of driving dynamics to improve agility, traction and safety.
The zfdisconnect system achieves an overall reduction of 4. Electric vehicle, vehicle performance, braking, traction control, european union 1 introduction. Ford focus rs torque vectoring control how it works. What a difference lexus torque vectoring differential makes.
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