Honda Accord Plug-In Hybrid

Two electric motors and a plug, coming soon to an Accord near you.
January 2011
BY MICHAEL AUSTIN

While in Japan for the 2011 Tokyo Motor Show, we visited Honda’s Twin Ring Motegi racing facility to see some of the company’s future products. Among them was a plug-in hybrid system, a prototype of which was installed in a current-generation Accord. While the car we drove is just a development mule, we can confidently say that a hybrid like this one will be part of the lineup when the next-generation Accord debuts for the 2013 model year.

Honda’s new plug-in system is totally different from the single-motor IMA drivetrain found in the Insight, CR-Z, and Civic hybrids. The main powertrain components are a 2.0-liter Atkinson-cycle inline-four and two electric motors—one to charge the battery pack and one to spin the wheels. The gas engine puts out 134 hp and 111 lb-ft of torque; the drive motor is good for 161 hp, and the generator is rated at 100 kW.

We first saw this system previewed at the 2010 L.A. auto show, and the specifications are largely unchanged. EV mode works up to 62 mph for 10 to 15 miles. The gasoline motor can spin the drive wheels directly, bypassing the electric motor and returning highway fuel economy closer to that of conventional cars, which typically fare better than hybrids at high speeds. How this works is the curious part. My exchange at a powertrain display stand with a Honda engineer who was barely conversant in English:

“So how does the transmission work?”
“No, no transmission.”
“Yeah, okay, so the motors make a CVT like in the Prius? How does that work here?”
“No, the motor is direct drive.”

We went back and forth in this manner for about five minutes. When I then asked how the gasoline engine works at highway speeds, he told me that there’s a single ratio with no transmission. Take this with a grain of salt, as Honda’s specification sheet says the car uses an “electric CVT.” Later follow-up didn’t provide a more clear answer, so a better explanation down the road could prove the above to be inaccurate.

Going back to the engineer’s explanation, multiple clutches allow the system to work in full-EV mode, full-gas mode, or a mix of the two. When driving the wheels, the engine is always using a tall highway ratio, and the electric motor uses a single-speed gear reduction as well. At slow vehicle speeds, the electric motor can work on its own or feed in to provide assist. Conversely, in cases where the battery’s charge is depleted, the gas engine can produce juice using the generator, which then sends power to the drive motor; in effect, this means that the engine would indirectly drive the wheels.

Our test drive of the Accord was limited to a few miles at low speeds, but the system looks very promising. You can get a decent amount of power without activating the combustion engine (we were unable to determine, and Honda isn’t willing to share, the parameters that allow for EV operation). When the engine does kick in, though, its speed isn’t relative to vehicle speed, and it drones a bit—but Honda has plenty of time to rectify that before we see such a system in production. There is a slight delay between pressing the pedal and the gas engine kicking in, a feeling that reminds us of the Chevrolet Volt.

The Honda’s all-electric range is much shorter than the Volt’s. On the upside, its 6-kWh battery is lighter than that car’s. And the charging time, at around two hours on a 120-volt source, is a lot more attractive than the 10 a Volt needs from the same outlet. Honda didn’t provide any fuel-economy targets or estimates for the system.

Toyota, Ford, and Hyundai all have hybrids in the mid-size-sedan segment, and Nissan will soon return with a new Altima hybrid. Ford’s current Fusion in particular is very nicely executed and decent to drive; the 2013 Fusion will become the first to offer a plug-in option with the Energi model. So far, though, no one has figured out a similar solution for improving highway fuel economy in a hybrid. For a company that sold the first hybrid in the U.S. market and has since been eclipsed by its competitors, it’s nice to see some innovative thinking from Honda.

Source;
http://www.caranddriver.com/reviews/honda-accord-plug-in-hybrid-prototype-drive-review

Honda Commited to fuel economy

by John Leblanc

MOTEGI, JAPAN — Honda, like most of its rival Japanese automakers, has been taking it on the chin of late when it comes to its perceived lack of engineering and product innovation.

With up-to-date features like direct-injected and turbocharged engines and multi-gear or continuously variable (CVT) transmissions more than likely found in rivals from Germany, America or Korea, many customers perceive that Japanese automakers have lost their engineering mojo, or have forgotten how to innovate, after years of being at the top of the sales charts.

The day before it rolled out three concepts at the Tokyo Motor Show that showcased what we may be driving in 2020, Honda unveiled a slew of state-of-the-art technologies at the Twin Ring Motegi Super Speedway that will appear in new cars as early as next year.

The message was clear to the attending media: Honda is back in the business of innovation, and aims to be a leader in fuel economy.

“The first task, when I started as president, was to get ahead of (the competition), particularly in the area of hybrid batteries and fuel cells,” said Honda Motor CEO Takanobu Ito, who’s been with the company since 1978 and took over the top job in 2009.

Ito also said that Honda wants to have "the No. 1 fuel economy in each (vehicle) category within the next three years."

To get there, and under the marketing banner of “Earth Dreams,” the automaker is rolling out a family of new hybrid and gas engines, CVTs, and all-wheel-drive systems, all slated to appear in new models as early as next year.

On the hybrid front, Honda’s new 2013 midsize Accord (due late next year) will receive a plug-in electric hybrid version of the company’s new “two-mode” gas-electric system.

When mated with a four-cylinder engine, Honda is claiming equal power to the existing Toyota Camry Hybrid (200 hp), but better fuel economy than the Toyota’s 4.7L/100 km combined rating.

Technically, Honda’s new two-mode hybrid uses a twin-cam profile. However, instead of using the automaker’s traditional VTEC (Variable Valve Timing and Lift Electronic Control) profile for more power, the hybrid version shifts between an Atkinson cycle (for leaner fuel burning), and the traditional Otto cycle (for more power , depending on the torque load on the engine).

Honda says the system can also be combined with a V6, driven in electric-only mode for up 24 km, electric-and-gas for accelerating, or gas-only for highway cruising.

Once a leader, Honda is catching up to the competition by adding direct-injection and double overhead cams to its mainstream gas engines.

Dubbed “i-VTEC, the new engines promise more power and “at least” a 10 per cent fuel economy advantage over the outgoing powerplants.

For example, the 2013 Accord will get a new i-VTEC 2.4-litre four-cylinder with 181 hp and 177 lb.-ft. of torque (all preliminary ratings), up 4 hp and 16 lb.-ft., respectively, from the existing Accord four.

As well, a new 1.8L i-VTEC, with 148 hp and 133 lb.-ft. (gains of 8 hp and 5 lb.-ft.) may end up in the refreshed 2013 compact Civic, while a new 1.5 i-VTEC with 127 hp and 111 lb.-ft. (10 hp and 5 lb.-ft.) could find a home in the subcompact Fit.

Shying away from CVTs in the past, Honda is now working on three new units — one for mid-sized cars such as the Accord, and two for smaller vehicles such as the Civic and Fit — that will become the base automatic transmissions for all four-cylinder engines.

While competitor CVTs have a "rubber band" feeling similar to a slipping clutch under acceleration, the Honda system I drove at Motegi, in an Acura TSX test mule with the new i-VTEC 2.4, felt more like a traditional torque converter automatic, free of the high-pitch whine usually associated with CVTs.

Honda says the new i-VTEC’s engine control software has been remapped so there is less “hunting” for revs during hard acceleration.

Honda’s premium Acura brand will also see immediate benefits from the automaker’s recommitment to new tech.

“We are not satisfied with the brand’s current positioning. We want to make it more unique and sporty. We want to make it into a ‘high-end’ brand,” said Ito.

The midsize Acura TL sports sedan will receive a new 3.5-litre i-VTEC V6, now with 310 hp and 265 lb.-ft. of torque — 30 more horsepower and 11 more lb.-ft. than the current car’s base six.

More interestingly, Honda also had on hand an Accord engineering test mule that encompassed many of the new technologies that may end up in the oft-rumoured Acura NSX replacement.
Called Electric Super Handling-All-Wheel-Drive, and in the prototype we drove, a new i-VTEC 3.5-litre V6 was mated to an also-new seven-speed dual-clutch auto box with an integrated hybrid-electric motor that also uses the energy from regenerative braking to provide the power boost. All four wheels are independently powered, depending on the car’s cornering and traction needs.

When pressed, Honda engineers told us the hybrid powertrain was rated “well above 300 hp.”
But by the way the car shot forward from rest, my seat-of-the-pants were telling me that that number could be closer to 400 hp.

Speculation in the Motegi paddock was that a new concept car, in the spirit of the Acura NSX super car, would encompass all of the Accord Electric SH-AWD test mule’s new hardware, and is set to appear at next January’s Detroit auto show.

When asked about such a car, Ito replied, “I don’t know. Stay tuned!”

Source;
http://www.wheels.ca/article/801538

Try, try, again: Another Honda Accord hybrid on the way

Honda just introduced a bevy of energy-frugal cars at the Tokyo Motor Show and vowed to cut carbon emissions by 30% from year 2000 levels on all its vehicles by 2020.

But perhaps more interesting were remarks to reporters indicating that another Accord hybrid is on the way, wire services reported. The model was discontinued in the U.S. after poor sales, mostly because it didn't save much gas, as it modified a V-6, instead of a four-cylinder, engine.

"For such a future, the most important challenge we need to address right now is the improvement of the efficiency of gasoline and diesel-powered internal combustion engines," said CEO Takanobu Ito.

To get there, he says he hopes to modify gas and diesel engines and combine them with continuously variable transmissions, or CVTs.

As a down payment on Honda's greenness, he showed off the EV-ster concept, an electric rear-wheel-drive two-seater convertible sports car. He says it has an electric range of about 80 miles and is steered with a pair of levers.

Source;
http://content.usatoday.com/communities/driveon/post/2011/11/honda-vows-30-carbon-emissions-cut-in-japan-by-2020/1