Since GM's announcement of the Chevy Volt, people have been wondering what type of vehicle it is. Hybrid? Electric Vehicle (EV)? What?
First, let's
get some context from
Media Post, a marketing blog:
Chevrolet unveiled its new Volt to the press last week, but revelations about the intricacies of the electric motor and small gas engine under the hood have some arguing that the company has a launch problem on its hands: they say the car is not a pure electric vehicle and Chevrolet should have made that clear at the outset. The car is, in fact, powered an electric motor, with a small gasoline engine that comes on when the battery approaches depletion after about 60 or so miles of electric-only driving.
What has some observers riled is that on its extended-range mode the car's gasoline engine sometimes helps turn the wheels as well. Thus, semantically, the car's a hybrid, not an electric, they argue.
A site called Green Car Advisor reportedly noted this in June, but with the weekend event, where the company's technical explication included news about the car's extended range capabilities -- and the fact that under those circumstances the gas engines helps turn the wheels -- the web started the echo machine, with terms like "Volt Gate" banging from site to site like a Ping-Pong ball.
Edmunds.com's InsideLine said General Motors had duped the press: "Even conceding that all engineering projects involve compromise and chalking that phrase up to marketing hyperbole, the Chevy Volt isn't as electric as GM pretends it is," said the column. "And it isn't as electric as GM has been saying for the past three years." The article went on to say the Chevy Volt is a plug-in hybrid with more in common with Toyota Prius "than the marketing hype led us to believe."
GM argues that "electric vehicle" still fits because the drive train doesn't involve direct mechanical connection between the engine and the drive wheels. "In extended-range driving, the engine generates power that is fed through the drive unit and is balanced by the generator and traction motor. The resulting power flow provides a 10 to 15% improvement in highway fuel economy."
Pamela Fletcher, GM's global chief of global engineering for Volt and plug-in hybrids, tells Marketing Daily that the gist of the technology is that there are two ways to direct power flow through the Volt's drive unit in range-extending mode.
"First, we pull energy through the battery to the wheels. At the same time we have internal combustion engine connected to the generator motor replenishing the battery." She says that method is fine at lower speeds but becomes terribly inefficient at high speed, where that configuration becomes like rowing a boat with an oar that, rather than dipping in the water, connects to another oar that pulls through the water.
"It's just very inefficient," she says, explaining that power must take a circuitous route to get to the wheels. "Instead, when we get to higher speeds, we have clever solution where we put the combined power to the wheels on a planetary gear set." Jeremy Anwyl, CEO of Edmunds.com, says all of that definitely makes for a better vehicle. However, it also makes for a hybrid, at least under certain circumstances. "I think the confusion is an exercise in semantics," he says. "And it flubbed the launch of the Volt. GM has made a point of coming in here over and over, selling us story that the Volt is not a hybrid, not another version of Prius, but that it's an electric vehicle that only charges the battery. I think part of the reason our editors are wound up about it is we bought it. And repeated it."
Okay, that's a lot of information, but I think it is necessary to have some context before delving into a substantive discussion.
Clearly the Volt has certain attributes of an electric vehicle, mainly, the ability to travel 25-50 miles on electric power only. You plug it in, charge it for ten hours, then take it for a short spin. Nissan's Leaf is a recently revealed electric car, and it too is charged from a wall outlet and able to take a short spin (although more than double the distance of the Volt).
But what the Leaf lacks is an on-board internal combustion engine to increase the driving range. With the Leaf, once you run out of juice you're stranded. The Volt, on the other hand, has a gas engine that increases the potential driving distance. In this way it is like the Prius, except the Prius operates in an entirely different way. It can never run on electric power alone: From o-20 mph is runs on electric, beyond that the gas engine kicks in. With the Volt, you can cruise at highway speeds on solely electric power.
The guys at edmunds.com need to stop whining. The Volt now appears to have more in common with the Prius than originally thought, but that's probably a good thing. The longer range makes the car a more reasonable replacement for gas-only vehicles. Unlike the Prius, the Volt can run solely on electric, making it a lot more technically advanced.
These recent developments, rather than anger me like the people at edmunds.com, make me more enthusiastic about the Volt's success. With just the electric motor to power the wheels, with a gas-engine to recharge it for backup, the car seemed less real-world realistic. The gas-engine, under that configuration, would never directly power the wheels, making the system less efficient. The news that the Volt's drive-train is more complicated than expected, allowing for combined electric-gas engine operation, means that it is even cooler than originally thought.
Call it what you want, but the Volt is the most innovative car to be released since the Prius. This is a new type of hybrid-electric vehicle hybrid. A double hybrid.