The New Greenies -

The New Greenies


We embedded systems engineers are the new greenies.

Students hold marches for environmental reforms; politicians pander and defer action awaiting the results of more studies, but embedded developers build products today that consume fewer resources and emit less pollution that similar devices of just a few years ago.

I visit companies building a vast range of devices, from trifles spawned by some marketing person’s perverse brainstorm to those presaging a revolution in the way society works and behaves. I’m astounded – and delighted – at the number of embedded apps designed to reduce energy consumption and pollution. Few of these are built by companies waving the Greenpeace flag; instead they’re normal profit-driven businesses operated by coldly analytical MBAs responding to customers’ demands to cut costs.

For instance, most heating and air-conditioning controllers now incorporate features and technology to cut energy use. Even a moderate-sized building consumes an awful lot of power. Promise a 10% reduction and customers will crowd your lobby waving fistfuls of dollar bills.

(One smart president/engineer I know built a homebrew A/C system for his company. At night the equipment pumps cool desert air into the building’s concrete slab; during the day the circulation reverses, extracting the coolth and cutting his A/C costs in half.)

Smart factory controllers optimize the use of energy and raw materials. Big locomotive diesels controlled by high-IQ algorithms go further on the same amount of fuel. In the auto industry very brainy engine controllers extract the last bit of efficiency from each gallon of gas.

Take Toyota’s Prius, a hybrid which uses extremely smart electronics to manage an electric motor, engine and generator to drastically cut fuel consumption and pollution. We bought one late last year, waiting 6 months to take delivery. What passes for high fuel prices in the USA (I paid $6/gallon in Bermuda a few weeks ago) has created far more demand than Toyota can fulfill.

After 15,000+ miles I can report that the vehicle is astonishing. When the outside temperature is above 50 we average 55 MPG over all sorts of driving. In winter the number plummets to a still acceptable 48. In the city it’s not unusual to see the MPGs pegged at 99 for 15 minutes at a time as we slowly snake through the traffic.

(Other Prius owners report different figures; my wife and I are gentle drivers and prefer to look ahead, take action early, and avoid jackrabbit starts and stops.)

No hybrid could exist without a lot of embedded technology. The electronics seamlessly switches between electric-only, electric-assist, gas-engine-only, and regenerative braking. Come to a stop sign and the engine switches off. First time that happened I thought the car had failed. During normal driving the engine turns itself on and off many times per minute, with only a barely-discernable twitch.

I’m told the brake pedal is merely an input to the computer. Sure hope they got that software right. But when braking most of the car’s momentum charges the traction battery. Toyota reports that if one avoids panic stops it’s likely the brake pads will never wear.

One of the great benefits of capitalism is its never-ending pursuit of efficiency. Offer a product that’s cheaper to operate than the competition’s and you’ll (generally) succeed. And then the entire playing field evolves to a new, more efficient level as everyone adopts the new technology.

Not many decades ago we were content to waste resources. Energy was cheap; plastics, chemicals, and steel all inexpensive. No competitive pressure existed to conserve. Today’s business climate is very different, and we embedded engineers are the sole key to building new generations of products that meet this need.

Think about it: a fleck of silicon, plus plenty of clever software, can save mountains of coal and shiploads of oil.

That’s a pretty darn good legacy for any embedded engineer.

Jack G. Ganssle is a lecturer and consultant on embedded development issues. He conducts seminars on embedded systems and helps companies with their embedded challenges. Contact him at . His website is .

“I’m told the brake pedal is merely an input to the computer. Sure hope they got that software right.” Power steering based on an embedded system and an electric motor is next big thing. Just one defficiency: if control of motor malfunctions, steering moves on its own. Apply this with malfunctioning brakes and your off to the moon and beyond.

– Steve

Great article as usual Jack. It goes further than that : if the politicians weren't so enamoured with oil and really looked at the technology available to them, the internal combustion engine could be sent to the graveyard of history right now, today, and we'd all be riding around in fully-automated, highly efficient and 99.9% failsafe electric vehicles powered by clean electricity generation. Last week my friend was badly injured in a traffic accident due (as most accidents are) to a human not thinking. Exactly why we are still using these incredibly dangerous and inefficient machines 120 years after their invention (and essentially unchanged) is utterly beyond me. I think what it comes down to is the “look at me” factor : people drive a humvee instead of a prius because they think that us poor plebs on the sidewalk being swamped by their pollution are looking at them enviously. Me personally, I'm laughing (and swearing) at them. You know what they say about men who feel the need to drive big cars…

– Tony

At last, embedded engineers get some recognition as saviors of the environment! It would be good if MBAs understood the importance of costs in the long run than with a short sighted scope. With the G-8 focus as Environment and Africa, hope business climate changes for the better as we come together.

– Saravanan T S

Yes, its wonderful how we engineers are creating technology that saves energy and our precious natural resources. Unfortunately, a recent New York Times article points out that in the case of automobiles, with the exception of the Toyota Prius and its kind, the trend since the late 1980's is faster 0 to 60 times, heavier vehicles, and less overall gas mileage. Hybrid technology in SUVs and trucks is not being used to decrease fuel comsumption, but to increase horsepower and performance without decreasing the mileage too terribly much. The general public still wants bigger and faster – or at least the marketeers think they do and the auto engineers deliver – and we're still buying.

– Tim John

The only problem I have with being identified with GreenPeace or other Greenies is their use of thuggery, confrontation and sabotage to try and advance their agenda. IF they had kept their activities within the law over the past decades I might have more respect for them. (This last is somewhat doubtfull as the Greenies also resort to psuedo-science, outright lies, slander, libel, rabble rousing and panic mongering as tools to advance their agenda.It is hard to respect people like that.)

– Don McCallum

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