Day 4 of Sustainable Innovations:
For today's post, it's a 3-in-1 special! These 3 innovations fit into one idea -
energy recovery for car engines. Any hybrid car owners or Formula 1 fans here may recognize these innovations.
Starting off with what I think is the most significant of the three - regenerative braking, or in F1 terms the MGU-K. Essentially, it's when the electric motor goes in reverse. Not reverse as in reverse drive, but rather it lets backwards motion turns the motor, bringing some electrical power back to the battery. Relatively simple idea, yet so effective.
In Formula 1 (at least for now), they can also recover electrical energy from the car's exhaust through what they call their
MGU-H systems. Most generators in power plants need motion of some kind - mostly boiled, pressurized steam - to run a generator to produce power. In F1 cars, they take this idea and attached a generator to it's turbocharger, which is already collecting the exhaust to run a compressor to push in more air into the car's engine. When done right, as Mercedes has done for many years, the engine becomes so efficient that it can get more energy out of it's fuel than it wastes in the exhaust. (That's when they boast that their engines have "
over 50% thermal efficiency.")
Although the Prius does not have a turbocharger, it does have a way to recover some of the exhaust. There's some pipework that allows some of the
exhaust gas to recirculate back into the engine, helping to heat up the engine to optimal temperatures and allow some unburned fuel to get reburned.
I am sharing all this to show that even with gasoline-powered engines, there are still ways carmakers can ramp up the efficiency of their cars, making them more sustainable for the environment. Ideally, we would want transportation that doesn't pollute, but until then, finding ways to make our current technology more efficient and sustainable is an option that ought to be adopted too.