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Socket rocket: Plug-in Prius shows potential in test runs

October 24, 2007|Martin Zimmerman | Times Staff Writer

TOKYO — I had to go to Japan to do it, but I finally got my hands on a plug-in hybrid.

Not one of those hacked Priuses that after-market modifiers will produce in exchange for several thousand dollars and a canceled warranty. This was the real thing, built by Toyota at its research labs in Japan as part of its program to get a workable plug-in hybrid to market.

Toyota Motor Corp. sells more hybrids than any other carmaker, though that hasn't stopped some critics from questioning the company's commitment to advanced fuel-efficient powertrain systems.

So with the automotive media in town this week for the Tokyo Motor Show, Toyota perhaps decided it was opportune to demonstrate it has been spending time and money finding ways to replace the environmental disaster that is the internal combustion engine -- and has the sheet metal to prove it.

Which is how I came to be at a Toyota test track near the foot of Mt. Fuji, surrounded by engineers, interpreters, PR types and about half a dozen plug-in Priuses -- cars that may have a lot to say about how we get around in the future.

Hybrids such as the current-generation Prius use a traditional gasoline engine as their primary power source. A small, battery-powered electric motor powers the car for very short distances at low speeds and provides additional power at higher speeds. The payoff, in the Prius at least, is the highest miles-per-gallon rating of any mass-produced car in the U.S.

(Toyota and other automakers are working on plug-in hybrids with larger battery packs that would enable the car to travel several miles at highway speeds on electricity alone; the batteries would be recharged at night by plugging into a household outlet.)

Besides the bird decals and other eco-cute touches, the Priuses at Toyota's Higashi-Fuji test track looked a lot like the 2006 model that I drive from Glendale to work in downtown L.A. every day.

Other than the steering wheel being on the right, Japanese-style, the major difference in the interior was on the dashboard touch screen. In addition to the usual engine-motor-battery schematic, it displayed colored bars indicating whether the car was running on electricity alone or in hybrid mode. It also included a gauge that counted down the 10-kilometer, electric-only range.

The cars were equipped with nickel-metal hydride battery packs about twice the size of the ones in the current-generation Prius. The reason: to simulate the additional power Toyota hopes to get from lithium ion batteries, which are the leading choice among automakers right now for providing the power needed to move plug-in hybrids appreciable distances on electricity alone.

The Priuses at the test track could be operated in two modes: electric only or hybrid with an electric-only capability. (Unlike those in the U.S., Priuses marketed in Japan have an electric-only option, although the range is just a mile or so at very low speeds.)

The engineers warned me that the test cars were strictly developmental prototypes -- in other words, research vehicles not ready for dealer showrooms.

They weren't kidding. After strapping on my crash helmet and punching the familiar starter button, I hit the accelerator hard and almost threw the car out of electric-only operation.

OK, fine. When in hybrid mode, Toyota's plug-in system is designed to switch out of electric-only operation when it's confronted with a heavy demand for power -- maintaining speed up a steep hill, for example, or when dealing with a driver equipped with a crash helmet and a lead foot.

When I eased off the accelerator, the car didn't immediately switch back to electric power, even though the dashboard display said I had several miles of electric range left. I had to slow down to 20 kilometers per hour (you try to do metric conversions while careening around a test track) to return to electric-only.

That wasn't reassuring to someone thinking in terms of merging onto the 405 and then jamming across four lanes of traffic to the carpool lane, to enjoy seven miles or so of gasoline-free driving. In Southern California freeway traffic, slowing down to 20 kph to get the electric motor to kick back in isn't really an option.

The engineers assured me that it was no more than a software glitch, or maybe the catalytic converter didn't have time to warm up.

Whatever. A second test drive in a different test car resulted in the kind of torque-y acceleration electric motors are known for, speeding smoothly and quickly up to 50 mph or so, at which point an extra dose of throttle caused the gas engine to kick in -- as expected. And this time, almost as soon as the pressure was eased on the gas pedal, the car went back into electric-only operation as it was supposed to.

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