Over the past few years I’ve been following the automotive industry, especially in relation to electric cars and efficiency improvements. Â I have had a long time love of cars from an aesthetic/design perspective, probably rooted in the many drawings and lego vehicles I made when I was a kid.
Perhaps it was watching Who Killed the Electric Car, the talk of biofuels (and their positive and negative aspects) and hydrogen (with many questions relating to hype vs. reality) – I’m not sure which, but something clicked over the past few years that really opened my eyes to just how little innovation had actually been happening in the space, and I suppose piqued my interest from a sustainability perspective. Â I also think that the industry is somewhat of a bellweather for the broader market shift to sustainable technologies.
I was interested to note that this week Lotus Engineering have unveiled a concept car design, based on the Toyota Venza, that achieved a 30% weight reduction â€“ a critical component of efficiency â€“ over the Toyota design.
With a combination of lightweight materials and efficient design, Lotus claims to have achieved a 38 per cent reduction in vehicle mass, excluding the powertrain, for only a three per cent increase in component costs.
In other words, the Venzaâ€™s 1290kg mass was reduced to just 800kg on the Lotus-engineered 2020 concept.
… The companyâ€™s findings were released this week by the International Council on Clean Transportation and show how significant reductions in fuel consumption and CO2 emissions can be achieved for a regular mass-market vehicle through means other than the powertrain.
(egmCarTech has published an article of their own exploring the concept with further pictures.)
Over the past few weeks I’ve been reading the excellent book Natural Capitalism by Paul Hawkins and Amory and L. Hunter Lovins. Â In the chapter entitled Reinventing the Wheels the authors outline how lighter materials, better aerodynamics and alternative drive-trains (hybrid-electric) can radically improve the efficiency of cars. Â They call this concept the “Hypercar”, and note:
Detroit has long focused on improving the efficiency of the drive-line â€“ the fraction of the fuel’s energy that’s converted by the engine into torque and then transmitted by the drivetrain to the wheels. Â But there is an even better approach. Â The Hypercar concept attacks the problem from the other end, by reducing the amount of power that is needed at the wheels in the first place.
They go on to outline how efficient use of more expensive but lighter, stronger and more adaptable materials can reduce weight and manufacturing complexity with only mild increases in costs while at the same time reducing the resource intensity (how many resources are required in energy, labour and natural resources) of the car. Â Lotus’s concept seems to be taking this approach directly:
Still committed to founder Colin Chapmanâ€™s ethos of â€œperformance through light weightâ€, Lotus Engineering says the 2020 vehicle architecture uses a mix of stronger and lighter weight materials, a high degree of component integration and advanced joining and assembly techniques.
Whereas the benchmark Venzaâ€™s body-in-white contained more than 400 parts, the 2020 model reduced that number to 211.
Body materials in the Venza were 100 per cent steel, while the 2020 concept uses 37 per cent aluminium, 30 per cent magnesium, 21 per cent composites and seven per cent high-strength steel â€“ which Lotus says reduces the structure mass by 42 per cent, from 382kg to 221kg.
This is great news, and fantastic that Lotus is taking the initiative. Â It’s noteworthy, I think, that Lotus are heavily involved in Tesla Motors‘ development. Â However, I can’t help but have a twinge of disappointment that it’s taken over 10 years since Natural Capitalism was written (it was first published in 1999) for these techniques to be seriously considered, for a 2017 horizon.
Perhaps the technology and costs are only just starting to catch up to the vision, but I suspect it has more to do with the recent spur of activity in the automotive industry around electric vehicles that have resulted in this approach being applied.
Hopefully more of the ideas in the book start to come to fruition in the same way soon…