GM Reveals 2012 Buick LaCrosse with eAssist: 37 MPG Highway

[FenwickHockey65]

2012 LaCrosse Comes Standard With New Eassist™ Fuel-Saving Technology, For 37 Mpg Highway Fuel Economy In A Full-Size Sedan
Link to Article

November 15, 2010

* The eAssist “light electrification” system produces 25-percent increase in fuel economy
* eAssist technology is standard on all 2012 models with the 2.4L four-cylinder engine
* Provides customers with a full-size luxury sedan featuring 37 mpg highway and 25 mpg city for about $30,000 (exact pricing has not yet been set)
* Boost in fuel economy comes with no compromises in the driving experience

LOS ANGELES – Buick unveils the 2012 LaCrosse with eAssist,™ a new fuel-saving technology that increases fuel economy by 25 percent compared to the four-cylinder/six-speed powertrain in the 2011 LaCrosse. The eAssist technology provides class-leading highway fuel economy of 37 mpg, while maintaining the luxury, performance and value expected from Buick’s flagship sedan.

The eAssist system becomes the standard powertrain on LaCrosse starting next summer. The system uses a state-of-the-art lithium-ion battery system and electric motor-generator to enable regenerative braking capability to improve LaCrosse fuel economy by an estimated 25 percent.

“The LaCrosse with eAssist technology is the latest example of how this successful car – with sales up more than 200 percent for the year – is shaking up the segment and helping to reinvent Buick,” said John Schwegman, vice president of Buick marketing. “It is the smart choice for those who want great fuel economy and performance in a luxury vehicle, with excellent value – the LaCrosse with eAssist will cost thousands less than competitors with similar technologies.”

Mated to a 2.4L Ecotec direct injection four-cylinder engine and next-generation six-speed automatic transmission, the eAssist system uses power stored in the battery to provide needed electrical boost in various driving scenarios, optimizing engine and transmission operation. An advanced 115V lithium-ion battery and latest-generation 15-kW motor-generator unit help increase fuel economy through:

* Regenerative braking, which provides up to 15 kW of electricity to charge the battery
* Providing up to 11 kW (15 hp) of electric power assistance during acceleration
* Automatic engine shut-off when the vehicle is stopped
* Aggressive fuel cut-off during deceleration down to zero vehicle speed, enabled by the torque smoothing provided by the motor-generator unit
* Intelligent charge/discharge of the high-voltage battery.

Buick LaCrosse with eAssist technology also features improved underbody aerodynamics and tires optimized for performance and fuel economy, as well as active control of front-end airflow that improves aerodynamics and engine warm-up. Electronically controlled shutters in the lower grille close at higher speeds to push more air over the vehicle, which increases aerodynamic efficiency to enhance fuel economy. All of these technologies increase the eAssist system’s regenerative braking capability, while also improving the vehicle’s efficiency while driving.

“LaCrosse was the first in its segment with a four-cylinder/six-speed powertrain, the first with HiPer Strut and is now is leading the way with the new standard eAssist technology,” said Schwegman. “Importantly, LaCrosse with eAssist is the standard powertrain for four-cylinder-equipped models and there isn’t a cost premium.”

LaCrosse with eAssist includes an ECO gauge on the instrument panel that continuously responds to driving behavior, enabling the driver to drive with maximum efficiency. It also features a hill-assist system that captures brake pressure to help the driver more comfortably accelerate from a stop on a moderate or steep grade. It does this by greatly reducing the tendency of the vehicle to roll backward with the engine in shut-down mode.

eAssist details

While the eAssist system shares the same basic belt-alternator-starter configuration of previous BAS designs, it delivers more than three times the power and is much more capable than the previous-generation BAS system.

“The eAssist system is more than just the next-generation BAS system. The ability to integrate regenerative braking with the latest lithium-ion battery technology creates a system that delivers significant fuel-efficiency gains that customers will enjoy,” said Steve Poulos, global chief engineer of the eAssist system. “Being able to provide electric boost to the powertrain system during heavy acceleration and grade driving enables the LaCrosse transmission to operate more efficiently, while the added functionality of engine start-stop and fuel shut-off during deceleration provides added fuel savings.”

The eAssist system’s 115V air-cooled lithium-ion battery bolsters the 2.4L Ecotec four-cylinder engine with approximately 11 kW (15 horsepower) of electric power assist during heavy acceleration and 15 kW of regenerative braking power. That compares with only 2 kW of power assist and 5 kW of regenerative power on the previous BAS system. The greater power capability enables greater energy capture during regenerative braking for improved fuel economy.

The system also enables the Ecotec engine to shut down fuel delivery in certain deceleration conditions, which saves additional fuel. While in fuel shut-off mode, the motor-generator unit continues spinning along with the engine to provide immediate and smooth take-off power when the driver presses on the accelerator. Then, as the vehicle comes to a stop, the motor-generator unit spins the engine, bringing it to a smooth stop – properly positioned for a smooth restart.

“The battery system is designed to provide power assistance to the internal combustion engine, rather than storing energy for all-electric propulsion,” said Poulos. “It’s really an extension of the conventional internal combustion engine, not a replacement for it.”

The eAssist power pack contains the lithium-ion battery pack, the integrated power inverter and 12V power supply. It is located in a compartment between the rear seat and trunk; and it is surprisingly compact and lightweight, weighing only about 65 pounds (29 kg). It still allows rear access to the trunk via the split-folding rear seat – an attribute not shared with other hybrid competitors. Trunk space is slightly reduced when compared with 2011 models with the four-cylinder/six-speed powertrain, but still offers 10.9 cubic feet (307 liters) of storage. An electric fan cools the power pack, drawing air from a vent located in the package tray, behind the rear seat. The fans are designed to be quiet from the cabin.

The eAssist system’s electric motor-generator is mounted to the engine in place of the alternator to provide both motor assist and electric-generating functions through a new engine belt-drive system. The motor-generator is a high-performance, compact induction motor that is liquid-cooled for increased performance and efficiency.

Next-generation six-speed

The eAssist system works with LaCrosse’s direct injected 2.4L Ecotec four-cylinder and next-generation six-speed automatic powertrain combination. In the LaCrosse with eAssist, the engine is rated at approximately 180 horsepower (134 kW) and the next-generation Hydra-Matic 6T40 takes transmission technology to the next level with features designed to enhance powertrain efficiency.

Significant internal transmission changes to clutch controls and hardware provide reduced spin losses while improving shift response and time. The added electric power provided by the eAssist system allows for higher gearing to improve steady state efficiency without impacting acceleration performance or driveability. The system’s capability of providing some electric assistance at cruising speeds allows the driver to accelerate lightly or ascend mild grades without the transmission downshifting.

An auxiliary, electric-driven transmission oil pump is added to the 6T40, which keeps the transmission primed and the fluid flowing when the engine shuts down at a stop. That keeps the transmission ready to perform when the driver accelerates, for a seamless, uncompromised driving experience.

“It’s a very integrated powertrain system, with no compromises in driving performance, shift quality or ride and handling,” said Daryl Wilson, LaCrosse lead development engineer. “We believe this combination points to the future of vehicles powered primarily by an internal combustion engine.”

[fielderLS3]

Is this similar to the Malibu mild hybrid system?

[FenwickHockey65]

Originally Posted by fielderLS3

Is this similar to the Malibu mild hybrid system?

Yes, but vastly improved.

Note also that this is now the STANDARD powertrain for the LaCrosse.

[fielderLS3]

Since it's the standard powertrain, is it safe to assume this will find its way into many other GM cars in the near future?

[FenwickHockey65]

Originally Posted by fielderLS3

Since it's the standard powertrain, is it safe to assume this will find its way into many other GM cars in the near future?

It's definitely possible.

[syr74]

Alright, the pricing structure makes it pretty evident that this is going to be very close to a kind of 'no cost' alternative to the HF V-6. In other words, pick your poison....more power and refinement or increased fuel economy. I get it, and fundamentally speaking I think it works. Certainly it makes a lot more sense than just having the standard, run of the mill four cylinder as the base engine in a car priced as dearly as the LaCrosse, which is what we have right now.

That said, I think a ~30k price point for what is effectively a very base LaCrosse is still really pushing it. In fact, I think the word optimistic best describes Buick pricing as a whole right now.

[FenwickHockey65]

Originally Posted by syr74

Alright, the pricing structure makes it pretty evident that this is going to be very close to a kind of 'no cost' alternative to the HF V-6. In other words, pick your poison....more power and refinement or increased fuel economy. I get it, and fundamentally speaking I think it works. Certainly it makes a lot more sense than just having the standard, run of the mill four cylinder as the base engine in a car priced as dearly as the LaCrosse, which is what we have right now.

That said, I think a ~30k price point for what is effectively a very base LaCrosse is still really pushing it. In fact, I think the word optimistic best describes Buick pricing as a whole right now.

The pricing is exactly where it should be, and considering how the average transaction price on LaCrosse is much higher than expected, consumers really don't mind.

[syr74]

Originally Posted by FenwickHockey65

The pricing is exactly where it should be, and considering how the average transaction price on LaCrosse is much higher than expected, consumers really don't mind.

Where it should be according to whom? This thing competes dead nuts with the Taurus despite the near luxury aspirations GM may have for the brand, and the Taurus starts at a much more reasonable msrp. In fact the sales story reads much the same for these two cars, with the Taurus moving at a much higher average transaction price than Ford expected as well.

The two paths diverge at volume, the Taurus easily best the Buick here likely because the pricing is much more realistic and because the SHO option offers a halo effect that the Buick is currently missing. Ultimately, the reality is that people who spend the extra dough on a Ford get more than just a Buick badge for their trouble. Current sales volume comparisons indicate that people have noticed and they do indeed mind.

Long term I don't see the 'it's expensive because it's a Buick' strategy playing overly well. And the problem is that badge is currently the only justification Buick has for this cars price point.

[FenwickHockey65]

Taurus and LaCrosse are both selling in the 50-60k unit range YTD, with no incentives on LaCrosse.

If you honestly think that the Buick badge is the only reason the LaCrosse now starts near $30k, you're delusional.

[syr74]

Originally Posted by FenwickHockey65

Taurus and LaCrosse are both selling in the 50-60k unit range YTD, with no incentives on LaCrosse.

If you honestly think that the Buick badge is the only reason the LaCrosse now starts near $30k, you're delusional.

Nice to see you have no trouble glossing over the differences here where it suits your needs. Taurus is at 60k units year to date despite that fact that Ford has continually stated that top of the line Limited and SHO models are very much production volume limited. LaCrosse is at 52k units through October of this year and inventory on lot numbers make it very clear that LaCrosse is a lot of things, but volume limited isn't one of them.

As for reasons why the Buick is worth 5k more than the Taurus, it's going to take an imaginative mind to come up with an argument for the same but if you're willing to try I'll read it.

[FenwickHockey65]

Originally Posted by syr74

Nice to see you have no trouble glossing over the differences here where it suits your needs. Taurus is at 60k units year to date despite that fact that Ford has continually stated that top of the line Limited and SHO models are very much production volume limited. LaCrosse is at 52k units through October of this year and inventory on lot numbers make it very clear that LaCrosse is a lot of things, but volume limited isn't one of them.

As for reasons why the Buick is worth 5k more than the Taurus, it's going to take an imaginative mind to come up with an argument for the same but if you're willing to try I'll read it.

You're not going to sucker me into an argument over which is the better car. There are plenty of comparison tests out there that can be found with a simple Google search of "Buick LaCrosse vs. Ford Taurus." Read them yourselves.

As for why the LaCrosse is now $5k more than the Taurus, the eAssist system isn't free.

[syr74]

Originally Posted by FenwickHockey65

You're not going to sucker me into an argument over which is the better car. There are plenty of comparison tests out there that can be found with a simple Google search of "Buick LaCrosse vs. Ford Taurus." Read them yourselves.

I've read them, and as a group they have a consistent theme...they're more or less a wash. There is nothing to sucker you into here, because there isn't anything to justify a 5k difference in msrp.

Originally Posted by FenwickHockey65

As for why the LaCrosse is now $5k more than the Taurus, the eAssist system isn't free.

The LaCrosse is 5k more than a comparable Taurus whether you get the V-6 or I-4, so the cost of the eAssist system isn't the problem.

[FenwickHockey65]

Look, think what you want. If you like the Taurus more than the LaCrosse, more power to you. I think it's a great car as well, but I don't think it's better than LaCrosse.

To get this thread back on track, the bottom line is that eAssist is definitely something that needs to be integrated into the rest of the GM lineup.

[syr74]

Originally Posted by FenwickHockey65

To get this thread back on track, the bottom line is that eAssist is definitely something that needs to be integrated into the rest of the GM lineup.

As an option, I would agree that it makes for a good idea. If it is going to raise the base price of everything 3k like it appears will happen here, that could be bad juju. Standard equipment on Cadillac models might be easier to swallow. A CTS Sport model with a LS3 V-8 and standard eAssist could easily meet or beat the fuel economy of the V-6 model with a much more interesting power curve.