This is the Toyota FT-Bh, a hybrid concept that gets 134.5 mpg, that is approximately 57 kilometre per litre. The Concept was conceived to show how to build a Toyota Yaris-sized hybrid for maximum efficiency without using exotic materials that would drive up prices. Weighing a scant 1,700 lbs., and sculpted for aerodynamics, the FT-Bh's power comes from a 1-liter, two-cylinder engine -- a smaller mill than what you find in large motorcycles.
Toyota’s new FT-Bh concept is a vehicle designed to take the efficiency of full hybrid vehicles to new heights. Making its debut at the Geneva motor show, it is an ultra-light concept, weighing less than 800kg, which demonstrates what can be achieved in terms of fuel consumption and CO2 emissions in an affordable family supermini.
Those figures are from a vehicle that is close in size to today’s Yaris, at 3,985mm long, 1,695mm wide and 1,400mm tall, with a 2,570mm wheelbase. The emissions are about half the level of those produced by a 1.0-litre Yaris.
In their mission to achieve the best possible fuel economy and emissions, the design team focused on five key areas: reducing weight; driving resistance (including aerodynamic and tyre performance); powertrain efficiency; thermal energy management; and electricity savings.
Toyota recognises that a real-world reduction of total global vehicle CO2 emissions can only be brought about if an affordable, ultra-low emissions vehicle can be manufactured and sold in sufficiently high volumes. That made it important that the concept did not require exotic, expensive materials or complex manufacturing procedures, but used instead only those that are already commonly available in the motor industry.
Design
“Ecomotion” was the theme for styling FT-Bh, with its shape demonstrating a new approach to bodywork design. Key panels, such as the roof, are formed to represent the way fabric can be stretched taut between fastening points, to reflect their ultra-light weight.
The front end of the car broadcastsToyota’s current design language with its large lower grille, together with a sculpted bonnet and headlamps that are integrated into the front wings. Ultra-slim A and C-pillars maximise the glazed area for better visibility and a greater sense of space in the cabin.
The way in which the cabin merges seamlessly into the rear of the vehicle, with an uplifted rear bumper and chevron-shaped corner elements, helps achieve the best possible aerodynamic performance and deliver a drag coefficient of just 0.235.
The stretched fabric-look carries through to the minimalist interior, with a concave centre console creating a driver-focused cockpit, while maintaining the overall feeling of light and space.
Weight saving
The target for FT-Bh was a 25 per cent saving on the 1.0-litre Yaris’s
1,030kg kerb weight. Using a combination of high-tensile steel,
aluminium and magnesium in the construction has trimmed the weight to
just 786kg.
In fact, because the hybrid powertrain is heavier than the three-cylinder 1.0-litre engine (weighing about 60kg), the combined mass of the bodyshell, interior trim, chassis and electronics had to be reduced by around 340kg – one third of Yaris’s weight – to achieve the target.
Such a large saving in the
weight of cabin parts has had a ripple effect in weight reduction in the
rest of the vehicle. For example, it means there is less load applied
on the body structure and suspension, allowing components to be
downsized. And less weight means a smaller displacement engine can be
used, further saving weight and thermal energy losses.
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