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Interior and exterior views of the Cadillac Converj concept-- according to a new report, the Converj has received the go-ahead for production and will hit the streets in 2011. It could be GM's first profitable electric vehicle and is expected to have more power than the Chevy Volt.  (Source: Motor Trend)
GM gets the second entry in its electric armada ready as it faces troubling times

When it comes to GM, it’s hard to remove its financial predicament from news of its tech developments.  However, assuming that it can survive, GM has approved production of the Cadillac Converj according to a recent report.

Though some have poked fun at the name, the Converj has been quite popular ever since it was introduced as a Volt-derivative plug-in Cadillac concept at the North American International Auto Show 2009 in January.  The model seemed a logical move -- the Volt's production price is well above that of an average Chevy, but closer to that of a luxury brand model -- like a Cadillac.  By essentially re-releasing the Volt with luxury styling, the cost of deploying the Volt could be offset somewhat with an even pricier model under the Cadillac umbrella.

The vehicle has received official go-ahead from GM according a report from Motor Trend.  GM reportedly plans to unleash it on the roads in 2011 making it a 2012 model year vehicle.  Sources say that the Converj could even be the first profitable electric vehicle -- a major victory for GM, and a big boost in getting federal approval of their revised restructuring/bailout proposal, due June 1.

The source at GM says that the Converj will be followed up by a people-mover/crossover utility based on the Voltec (Volt) architecture. 

A GM spokesperson denied both comments, saying that no changes had been made with the Converj or other models.  However, Motor Trend stands by its source, stating.  The publication points out that the drivetrain (lithium-ion battery pack and 1.4L four-cylinder engine) could be largely reused from the Volt, with more battery mass added to give it more power.  The main work would be working an all-new sheetmetal and interior.

The new production model will reportedly be a two-door coupe, like the concept.  This is different from the 4-door with hidden handles version that retiring product chief Bob Lutz suggested.  The height of the production vehicle will also have to be tweaked to make production financially feasible.

The source says that they believe the Buick brand is a likely target for the people-mover.  GMC is another branding possibility.  The Voltec CUV would have two to three rows of seats

GM is continuing to make efforts to grow its profitable brands as it reluctantly agrees to kill other ones, as part of its restructuring -- including Saturn, Saab, and Hummer, according current expectations and reports.  GM has also entered into a partnership with Segway to release new light electric two-wheelers for urban streets.



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RE: Killer design
By Keeir on 4/15/2009 7:27:06 PM , Rating: 5
quote:
It's their JOB to do theses things, and if they can't then there is no need to call themselves engineers.


Are you an engineer? Have you ever tried to get something past safety regulations?

I think this statement answers the question

quote:
Everyone should know that cars should be able to get 200 mpg by now.


Heres the an actual analysis of the situation:

A gallon of gas contains approx 132 x 10^6 Joules of energy

The best possible gasoline engine that could every be created will turn approx 45% of that energy into rotational energy/motion.

59.4 x 10^6 Joules

The best possible trasmission/gearing will only transfer approx 90% of that rotational energy/motion to wheels.

53.4 x 10^6 Joules

Force exerted by Air Resistence alone =1/2*p*v^2*Cd*A. Cd is best possible right now as .25. Cross Section Area... I don't want my car to be smaller than 50 inch high by 60 inch (A prius is 58 by 66) so minimum of 3000 in^2 (1.935 m^2). I want to travel at least 60 mph (26.82 m/s). Standard Air has density 1.2754 kg/m^3.

So minimum Force acting on a car is 221.89 kg*m/s/s or 222 N.

Work is F*d. A gallon of gas using IDEAL components can push an IDEAL car 149 miles.

Being realistic, due to safety requirements, pollution requirements, and variablity requirements, a 30% efficient gasoline engine would be an amazing peice of technology.

A system to get the engine motion actually transfered to forward motion at around 85% is pretty good!

And to be fair, a drag+friction force more like 350 N (Current Civic) is much more reasonable to allow for comforatble cars that seat more than 2.

This gives a maximum reasonable steady state at 60mph on a flat road of ~60 miles on a single gallon of gas. This is what should be acchievable right now using gasoline.


RE: Killer design
By wookie1 on 4/15/2009 9:43:48 PM , Rating: 2
Did you also factor in the rolling resistance of the tires and the drivetrain losses? Rolling resistance is the more significant drag up to at least 30 to 40MPH.


RE: Killer design
By goku on 4/16/09, Rating: 0
RE: Killer design
By Keeir on 4/16/2009 3:49:32 AM , Rating: 3
Sorry, but "I don't like your conclusion" is not a great basis for saying my math is wrong.

Read my input assumptions:
Safe Medium Sized Car, similar to US Civic/Accord
Meeting Tier 2 Bin 5 emission requirements
Steady State, 60 mph travel

If you take a Geo Metro body (Does not pass current safety standards, and is Tiny! Making it practical for only a small subset of the population), add a gasoline engine similar to a Prius (probably the most efficient mass produced engine, not really suitable to varied loads but hey if you are willing to deal with crummy performance you can get better milage) and throw on some expensive and non-durable low rolling resistance tires.... Yep, you too can have a car capable of traveling 75-100 miles per gallon at my 60 mph speed... Did I mention stripping of the pollution controls? The car might produce more harmful emissions per mile, but hey less CO2!

In reality, people want/need the civic/accord/cr-v/pilot sized cars... Why do you think ALL manufactures are producing RD prototypes outside the gasoline range? Their engineers know there are realistic limits about how efficient various car types can ever get...

In conclusion, I am not saying 60mpg Highway is the limit for all autos, just ones the public would be willing to buy! Hey look at the tiny Honda Fit... It gets what like 33 mpg Highway? It's really only about 50% as efficient as that frontal area ever could, so it really isn't like there is no room for improvement (Hatchback increases drag, durable tires increase friction, variable engine to allow "sporty" performance, radios climate control etc)


RE: Killer design
By RandallMoore on 4/16/2009 10:33:52 AM , Rating: 2
quote:
Are you an engineer? Have you ever tried to get something past safety regulations?


Yes, a network engineer. Safety regulations isn't of my concern so no, I have not. It is not my job to do so. However, it is my job to continually find new and different ways to upgrade and maintain networks and electronic equipment while standing within a certain (most often unreasonably low) budget.

I can't challenge your technical layout of gas efficiency but I can say that just because I am not an auto engineer doesn't make me unable to evaluate innovative progress or lack thereof.

You are right that there is a finite limit on the efficiency of internal gas combustion. I'll never dispute that. Perhaps my number of 200mpg is a little more than what's possible but my whole point is they are no way near what they should be in terms of the age of the internal combustion engine. We all know with absolute fact that the oil companies and their ties with legislation have been the biggest hindrance. That statement also brings me to say that hydrogen adoption will only come about when the tycoons and law dogs find a way to take complete control. Seeing how you could perform a safe hydrogen extraction from well water in your own back yard, it is hard to imagine that they will ever make that push.

No hard feelings about this discussion though, cheers!


RE: Killer design
By cerx on 4/16/2009 10:44:08 AM , Rating: 2
I agree. Why do you think SUVs were so popular in the 90s? Was it so hard to see a gas-price hike back then? No. The car companies made SUVs instead of researching more fuel-efficient vehicles. And now they are reaping what they have sown.


RE: Killer design
By djc208 on 4/17/2009 7:23:58 AM , Rating: 2
Because people like large powerful vehicles and gas was cheap enough to afford them.

The auto makers produce things because people want them. While they certainly hold blame for letting their smaller cars falter in that environment you can't blame them for not wanting to spend money where it's not profitable.

The fact that a high performance car now days has at least 500+ HP and most closer to 600, or the fact that GM managed to create a whole new brand around one of the most fuel in-efficient SUVs (HUMMER), or that Cadillac's resurection was funded by the vehicles like Escalade and CTS-V points to the fact that most people don't want smaller vehicles if given the choice.

The problem for the big three (and all the rest of the auto makers too) is that what people wanted changed essentially over night. When new car development takes years but the price of gas can double in a month there's no way the auto companies can suddenly throw out new vehicles into a changing market.


RE: Killer design
By Spuke on 4/16/2009 1:35:47 PM , Rating: 2
quote:
This gives a maximum reasonable steady state at 60mph on a flat road of ~60 miles on a single gallon of gas. This is what should be acchievable right now using gasoline.
Nice work! Very informative. Thanks.


RE: Killer design
By ThePooBurner on 4/22/2009 5:42:17 PM , Rating: 2
Please redo your equaltions to be based on a steam powered engine that runs on gas or diesel and then come back. 60mpg max for a car people would want. Psh.


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