Toyota FT-Bh Hybrid Concept Car Design – a concept bringing efficiency to a new level – Concept designed to demonstrate minimised emissions within an economically viable framework – Design inspired by the natural flow of the air – 3,985 mm long combined with light weight body design resulting in a 786 kg mass – High level of aerodynamic performance resulting in a Coefficient of Drag (Cd) of just 0.235 – High efficiency 1.0-litre petrol, 2-cylinder, full hybrid powertrain – Aiming at 2.1 l/100 km and 49 g/km – a new milestone for a full hybrid powered vehicle Making its World Premiere at the 2012 Geneva Motor Show, the FT-Bh concept is an ultra-light, sub-800 kg, full hybrid vehicle designed to lower fuel consumption and minimise emissions for an affordable B-segment family car. Clearly expressing the Under Priority design language and Keen Look styling of Toyota’s next generation vehicles, the FT-Bh has the dimensions of a B-segment vehicle. It is 3,985 mm long, 1,695 mm wide and 1,400 mm high, with a long wheelbase of 2,570 mm. The new concept’s design is driven by 5 key pillars targeting optimum fuel efficiency and minimised emissions: Mass Reduction; Driving Resistance in the form of aerodynamics and tyre rolling resistance; Powertrain Efficiency; Thermal Energy Management and Electricity Saving. Combining a highly significant reduction in weight for a car of this class with painstaking aerodynamics, a rigorous reduction in driving resistance and a frugal yet highly efficient full hybrid powertrain, the FT-Bh concept is projected to deliver an average fuel consumption of just 2.1 l/100 km and CO2 emissions of only 49 g/km. The FT-Bh targets CO2 emissions which are less than half those of the current 1.0 litre Yaris. But only through the mass-production of an affordable ultra-low emissions vehicle can sales volumes be large enough to make a genuine contribution to the real world reduction of total vehicle CO2 emissions on a global scale. Aimed, therefore, at maximum affordability, the techniques and thought processes demonstrated in the concept’s design do not involve the use of exotic, expensive materials or complex procedures, but only those already commonplace to the automotive industry. Moreover, the goals of light vehicle weight, a low centre of gravity and maximum powertrain efficiency are beneficial not only in terms of low fuel consumption and emissions, but also in offering a more responsive, agile and engaging driving experience. Design Styled under the ‘Ecomotion’ theme, the FT-Bh concept’s exterior design combines emotive shapes with an extremely high level of aerodynamic performance to achieve ultra-low fuel consumption.
High Efficiency Powertrain The FT-Bh’s full hybrid drive system is a masterpiece of powertrain downsizing. Almost 90 kg lighter than the Prius’ HSD system, it features substantial weight savings to every component of the drive-line. The petrol engine is 38 kg lighter than that of the Prius. And the lithium-ion battery pack weight is almost half that of the Prius’ nickel-metalhydride battery. The lightweight, 2-cylinder, 1.0 litre Atkinson cycle petrol engine combines high efficiency with a low thermal capacity. Combustion efficiency has been maximised through the adoption of a long stroke, a high, 13:1 compression ratio, a next generation D4 injection system with a high fuel-injection pressure, a larger Exhaust Gas Recirculation (EGR) system with cooling and a high tumble port design. Ultra-low friction measures have been applied to the axis receivers, timing belt and electric water pump, and painstaking thermal energy management involves the use of a low heat capacity, reduced cold friction and the careful control of heat flow to regulate engine oil and water temperatures. As a result, this remarkable powertrain achieves an average fuel consumption of only 2.1 l/100 km, and CO2 emissions of just 49 g/km. A combination of light vehicle weight and hybrid power offers FT-Bh drivers a return to the fundamental pleasures of city driving. The concept’s light, 786 kg kerb weight maximises responsiveness to both throttle and brake inputs, while the hybrid powertrain’s electric motor produces maximum torque from a standstill to provide nimble drivability in traffic. Reinforcing the adaptability of Toyota’s Hybrid Synergy Drive® technology to alternative energy sources, the FT-Bh also serves as a study for even greater fuel efficiency in the mid-term future through the potential installation of two alternative powertrains: a compressed natural gas hybrid (CNG-HV) version with CO2 emissions of only 38 g/km, and a Plug-in hybrid (PHEV) version emitting just 19 g/km of CO2. Thermal Energy Management and 50% Electricity Saving The FT-Bh targets improvements in the recovery of thermal energy and a 50% reduction in electricity consumption. Using the twin strategies of a reduction in demand for heat and a reduction in heat loss, further stringent measures are applied within the interior. The FT-Bh uses lighter cabin components that have a smaller thermal capacity or a high degree of thermal insulation. Carefully zoned air-conditioning targets only occupied areas of the cabin, and any remaining waste heat –already minimised due to the ultra-high-efficiency hybrid powertrain- is effectively used. The current draw from the FT-Bh’s LED headlamps, interior lighting and other electrical components has been drastically reduced, lowering power consumption to 50% of that of conventional cars. The glazing construction has been designed for maximum thermal efficiency, and even the concept’s pearl white, matte-finish heat-reflecting paint possesses excellent thermal insulation characteristics.
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