Re: G.M. ‘Officially’ Introduces 2011 Chevrolet Volt Amid Controversy

Apples and oranges. For one, like any other car engine that "requires" premium fuel, the generator engine in the Volt will run fine on regular gas.
Secondly hybrids, like the Toyota and Ford models, can be motivated by the gas engine alone. The Volt 4cy engine is not capable of motivating the vehicle by itself, it can only assist at highway speeds.
The Volts is an electrically power vehicle, it needs a predetermined voltage level, or it can not be driven. In Toyota and Ford hybrid models can be driven even if the voltage is zero. Huge difference

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Mine from Ford says regular gas only.
What was GM thinking?
On 13/10/2010 8:14 AM, Mike wrote:

--
In Alberta, Liberals are like rats, not many of them around.

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Very few twenty year old Fords used premium fuel. ;)

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No, they can't. Without MG1 providing a countertorque on the sun gear of the PSD the engine torque has nowhere to go so the engine freewheels. Once MG1 is providing a countertorque, either by electricity being drawn off or by it being turned backwards as a motor then can the torque from the engine can go from the planet gears to the ring gear and hence the wheels. Or if MG1 is generating it electrically goes from MG1 to the battery and/or directly to MG2. MG2, the ring gear, and the wheels are all directly linked. This is what makes them series-parallel hybrids not just series like the Volt or just parallel like the Honda IMA system.

Toyota hybrids don't have a 12v starter motor, without HV to spin MG1 and crank up the engine the vehicle goes nowhere. Honda models (or at least the original Insight) have a 12v starter for backup and can be driven with a dead HV battery.
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What? Once MG1 is providing a countertorque, (SIC) either by electricity being drawn off or by it being turned backwards as a motor then can the torque from the engine can go from the planet gears (etc.)

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Look at it like an open differential with say 4.10 gears. Turn the prop/drive shaft at 410 rpm and the wheels turn at 100 rpm. If you let one side freewheel the other side stops. If you now stop one wheel the other turns at 200 rpm. If you drive one side backwards at 100 rpm the other turns at 300.
This is how the PSD works as a virtual CVT. The driveshaft (pinion gear) is equivalent to the planet gears, one axle shaft (the sun gear) is connected to MG1 and the other axle shaft (the ring gear) is connected to MG2 and the final drive and thus the wheels. If you let MG1 freewheel the engine also freewheels.
Per http://eahart.com/prius/psd/ if you are going 60MPH and all 3 parts of the PSD were turning the same speed the engine, MG1, and MG2 would all be turning at about 3575 rpm.
If you now want an overdrive effect and want the engine to instead turn at 2000 rpm you need to drive MG1 backwards at about 2100 rpm. This is known as heretical mode or energy recirculate mode because during this mode the roles of the 2 MGs are reversed. MG2 generates and MG1 consumes. Some energy goes in a loop from MG1-sun-planet-ring-MG2-inverter and back to MG1. You would think this would be too lossy but apparently it is more efficient/less lossy than running the engine at a higher rpm.
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Got it!!

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took the test drive last month at the local Sustainable Energy HQ. The local tree-huggers and "electric purists" were casting shame on the Volt.
Chevy struck a neat balance between range and the downside of having to haul around a massive battery. This has cost, environmental and rear seat benefits. >80% of my trips will be all electric, <20% will reach into "extended" mode for more miles than Leaf can go. Volt works for me.
Our local utility's analysis shows the Volt with a more efficient charge rate. Chevy hasn't touted this advantage as yet.
--
pj

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