Green plastics
Every car uses plastic; it’s lightweight, strong, durable and attractive. But if not properly managed, its use can have serious effects on the environment both during its production, and at the end of a vehicle’s life.
Which is why we have been using recycling-friendly thermoplastics wherever we possibly can on our range of vehicles, including on the i-MiEV. This means inside and outside our cars on components such as the bumper, radiator grille and even the instrument panel.
Replaced body parts - such as bumpers - are used all over again. They are recycled back into items such as battery covers, wheel housing covers, centre ducts and filler-neck protectors.
Green plastics are the generic name for materials made from plant- based resins.
Not only are they carbon neutral in themselves but their use is also instrumental in conserving finite petroleum resources. To date Mitsubishi have developed automobile parts from polybutylene succinate (PBS) bamboo fibre board and polylactic acid (PLA fibres), the latter being used for items such as floor mats as well as interior trims and garnishes.
We have also developed a thermosetting resin from Cedar wood waste found on the forest floor which is being used to fabricate durable, heat resistant parts such as oil caps and pulleys for petrol vehicles, motor and battery compartments, and even ashtrays. Many of these ‘green plastic’ parts are to be found in the i-MiEV and will be introduced into other vehicles in the near future.
And how do we keep track of our green plastics? It seemed impossible at first, but in fact since 1991, all recyclable plastic fittings weighing over 100 grams on our cars have been engraved with a special serial number. That means we know what it’s made of, where it comes from - and how it can best be recycled.
We call this intelligent Motion.
Power-saving air conditioning systems
In conjunction with Mitsubishi Heavy Industries, Mitsubishi have developed a new type of scroll compressor which, in conjunction with a program of operating temperature optimization, has resulted in a more efficient auto air conditioning system.
In tests the system showed a 39% reduction in power consumption together with a 7% improvement in performance which, in practice, means that using this system would have virtually no impact on fuel consumption. This system was awarded a US Environmental Protection Agency Climate Protection Award in 2007.