The racing transmission specialist has developed an automated manual transmission (H-AMT), designed especially for hybrid vehicles, called 1010. It will be presented at the 11th International Symposium and Exhibition of Innovative CTI automotive transmissions, hybrid and electric, held in Berlin. Although this is still a prototype, the new gearbox is aimed at competing vehicle manufacturers in the field of high-end luxury and high performance sports and even limousines and can handle high torque motor, from 800 to 1,000 nm, depending on the vehicle?s total weight.
The new H-AMT 1010 is a compact and innovative transmission that can handle high torque, as it was once the gearbox supplied 1007 Pagani Huayra for. Xtrac believes his distinctive cross-transmission configuration lends itself particularly well to hybridization and offers a compelling solution to the preference of the super sector to offer a very high power to meet the objectives of the Euro 6 emissions standard that will come into Vigo in 2020 and whose primary requirement is a limit on CO2 emissions of 95 g / km.
The speed of an electric vehicle is 150 km / h, a value that covers speed limits established in European countries with the exception of the free disposal of the German Autobahn, which confirms the stabilization torque to fourth gear during acceleration and deliver high performance at all speeds up to the lowest speed, as deemed necessary to keep the engine speed low, thus improving vehicle efficiency.
Developed as an alternative to the heavier and more complex dual-clutch transmission (DCT), the H-AMT 1010 Xtrac has fewer parts and lower overall weight compared with a DCT transmission for hybrids. It also offers increased functionality over other systems of a single electric motor or hybrid and modular design allows it to be mounted on different architectures including longitudinal front engine designs. To increase the efficiency of the gearbox 7-speed, offers multiple modes of operation, including modes for internal combustion engines and the operation of the electric motor-generator and compression ratios of about 6:1, a value more top of offering many other transmissions in this sector.
It also has a function to apply additional torque to the drive shaft during a gear change, which in conventional transmission is interrupted to allow torque transmission is complete insertion of a speed.
The overall transmission ratio selected provides a balance between the amount of drive torque available from the electric motor and vehicle speed available before disengaging the EV mode at higher speeds. The size of the electric motor and the gearing between the electric motor and the drive wheels filling provides a maximum torque during gear changes up to 60 percent in a typical supercar, offering a substantial improvement in acceleration capabilities.
The ability to provide torque to the wheels independent of the motor drive also reduces the energy required to be absorbed by the main drive clutch during vehicle acceleration.
During the design of the transmission, Xtrac was set a number of objectives, including the development of an efficient method for assembling gears and shafts. To minimize changeover time, the arrangement allows gear shifts overlapping relationship with transmission pairs arranged sequentially no axes. The number of additional gear sets hybrid connection has been minimized by using existing multiple gears.
A key feature of the AMT 1010 Xtrac H-cross arrangement is in its placement locking differential in the rear face of the engine block, which keeps the very short length as the joint and shifts the center of gravity of the box shift forward as far as possible. This design allows for greater placement fleixibilidad transmission, you can go back and compact exhaust system and rear diffuser and design also enables shorter rear overhang.
Xtrac has been active for almost a decade in the development of transmissions for electric and hybrid vehicles, and more specifically in parallel with plug-in hybrid vehicles (PHEV), who believe they can provide the best technology solution to meet the reduction targets CO2 in 2020.
Chris Cholmeley, who has taken the technical direction of the project, says about that ?life cycles luxury supercar models are typically longer than those of conventional cars, because production volumes significantly lower and the need amortize the high development costs. With the requirement of reducing CO2 emissions in 2020, the next generation of luxury cars must meet the challenge of emissions, but also keep your brand and product appeal. Therefore, we have the potential to lead the development of emission reduction technologies, initially as luxury products, which can then be introduced progressively lower prices for economies of scale and increased volumes, although transmission Double Clutch is clearly one of the techniques for increasing the efficiency of hybridization. ?
Cholmeley added that ?the main strength of our gearbox is to improve efficiency through a dual clutch transmission and offer comparable levels of refinement to a conventional automatic transmission, but it is also true that the weight and production costs are negative factors against. By contrast, an AMT is the best choice for efficiency and has a lower cost for development and production, two key attributes important to the development and electrification of luxury cars hyper-efficient. The AMT have less weight and offer the best flexibility. Therefore, if the travel speed and the quality of a dry clutch AMT can be significantly improved, without having to adopt a wet clutch, more expensive and heavier than a DCT clutch, then this becomes a complete solution for hybridization of the super ?.
The curb weight of the hybrid 1010 is of 168 kg, 120 kg for gearbox and 48 kg for the engine and hybrid components. This total weight provides a weight saving of 20 percent compared to a DCT.
Xtrac recognizes that to deliver the full potential of a parallel hybrid system in a plug-in hybrid (PHEV), the route of torque through the transmission to deliver multiple modes of operation for the electric motor and the combustion as well able to operate independently or together. The operating modes of the EV 1010 includes a pure mode, whereby the electric motor can move the vehicle with minimum gear and use engine torque to meet special situations filler as urban driving.
Other operating modes include a forward power increment for as in Formula 1 and KERS application, storing the kinetic energy recovery system in the battery. Also, there is a way that extends the range of electric vehicles, a moving charge mode and one that, through a plug to recharge the battery when parked. Last but not least, is a high-performance mode allowing only operate with the electric motor through all transmission ratios with a combustion engine uncoupled.
?To meet all modes of operation, the hybrid solution enables new Xtrac inlet and outlet of the transfer, making it the outlet channel through which torque is achieved fully electric operating mode and Torque the filler ?said Cholmeley.
Xtrac has worked with a number of manufacturers of electric motors for hybrid and EV numerous applications. For the purposes of the new gearbox high performance hybrid H-AMT 1010, the transmission technology specialist has partnered with Magneti Marelli to develop the system performance electro-hydraulic control unit of the transmission, electric motor, inverter and system software. The design includes individual actuators in each selector and a DC motor output of 120 kW.
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Source: http://www.ricksautoparts.biz/422-xtrac-develops-advanced-hybrid-drive-luxury-sports.html
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