How the 2011 Chevrolet Volt Works

17 Фев 2014 | Author: | Комментарии к записи How the 2011 Chevrolet Volt Works отключены
Chevrolet Electric Cars

How the 2011 Chevrolet Volt

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Imagine a straight across a piece of paper. All the that have ever made exist somewhere on line, including the 2011 Volt .

At the left endpoint, write Gas to represent vehicles by gasoline. Go ahead and add diesel, E85 or any combustible fuel along gasoline if you must. Point is, our endpoint is not associated with or electric motors.

That’s Electricity is the label we’ll to the right endpoint of our line. represents the pure electric EVs for short. These have an motor, a battery pack and a to sit. You plug them in and them up.

When the battery out of juice, you’re walking.

A then, is any vehicle that between these two endpoints, any where motivation sometimes from electricity stored in sometimes comes from the of fuel or from any simultaneous of the two. That’s what means in the plain terms of engineering.

By this simple the 2011 Chevrolet Volt is a It has a gas tank; it has batteries. That’s two of energy. That’s a hybrid.


Of course there are waypoints between the endpoints of our And indeed there are all sorts of it’s a simple question of endpoint they’re closer to. The a car takes on the line is determined by the of its electrical components batteries and

Belt Alternator-Starter or BAS hybrids, the 2009 Chevy Malibu are the least powerful types, and sit just off the left endpoint. IMA (Integrated Motor Assist) such as the Civic Hybrid and the sit near the hash mark one quarter of the way along the line to a somewhat larger motor and plus a measurable range of driving.

The 2011 Toyota has advanced to about the halfway on the line. Much of the reason in a regenerative braking system works up to 0.6g of deceleration to account for 90 percent of the stops ever make without the pads and rotors. We’ve a 2011 Toyota Prius 3 or 4 miles on electricity at 35 mph.

are prototypes of the 2012 Prius running around and, the Volt, they can be plugged in for a amount of electric-only driving before the engine comes on. experienced about 15 miles of EV per charge, which puts the plug-in at the two-thirds marker our imaginary line. This still runs on gasoline of the time, though.

Enter the

But the 2011 Chevrolet Volt is to offer 40 miles of electric-only range, GM claims a big jump potentially puts the Volt at the point along the line and farther along than

GM seems to want to lay claim to the endpoint of the line, however. is the Volt, a name synonymous electricity, and GM has tried to reinforce its by describing it as an extended-range electric But we cannot ignore the fact the Volt has a gasoline engine. The Chevy Volt is a plug-in Not that there’s anything with that.

In fact, a lot right with such a

When GM first introduced the it told us that the car had two modes of Its T-shaped lithium-ion battery would supply enough to supply the electric motor for the 40 miles. When the batteries ran the gas engine would come on and enough electricity to keep the motor happy, but not enough to the battery.

At this point the would begin burning at an undisclosed rate until the plug-in opportunity.

Because explanation described no direct between the engine and transmission engine drove the generator, not the we put the Volt into the category of plug-in hybrid.

But now GM has admitted a few important details. The Volt has two not one. They are connected a planetary gearset. There are modes of operation instead of and the gasoline engine is mechanically to the planetary drivetrain in one of those

According to the conventions of automotive the Volt is a series-parallel plug-in similar to the plug-in Prius.

How It Together

Compared to a Prius, the Volt’s motors and gasoline engine to the planetary gearset at different The main traction motor also acts as a generator for braking under deceleration), to the central sun gear. The secondary is sometimes clutched to the outer gear, sometimes clutched to the gas and, most important, clutched to both at once.

In planetary gearset, the teeth are around the inside of the ring. perfectly sized planet are held apart at equal around the sun by a carrier, such each simultaneously meshes the sun and the inward-facing teeth of the outer gear. The spin of the planets is and unimportant, but their spin them to orbit the sun, and orbit speed is harnessed by the which is connected to the differential, the and the tires.

Four Modes of

Let’s walk through the modes in which the 2011 Volt works.

Mode 1: electric-only mode up to 70 mph. The traction motor-generator is turning, but it can go so fast. Here the ring is locked so it can’t turn. The motor-generator and the engine are disconnected and out of the

The main traction motor is alone to drive the sun gear battery power, which the planets in orbit. The orbit is sent out through the carrier and is to vehicle speed.

Mode 2: electric-only mode up to top speed mph). The engine remains Now the ring gear unlocks and is clutched to the second motor-generator, is acting as a motor to set the ring in

With the sun already spinning, any of the ring in the same direction increase the overall orbit of the planets, which in turn vehicle speed beyond 70

Chevrolet Electric Cars

Mode 3: Low-speed series mode up to 70 mph. Gasoline is now the fuel that’s propelling the in series-hybrid fashion. The battery has run as far as the control system will

The ring gear is unlatched the second motor-generator and locked in as it was in Mode 1, and the main traction once again is solely for making the planets orbit. But the to do that now comes from the gas which has been clutched to the motor-generator, now in generator mode.

4: High-speed series-parallel hybrid up to top speed. This is classic series-parallel operation. You can’t both electric motors the car at high speed like we saw in 2 because the battery is discharged, that the second motor-generator continue to be a generator driven by the This is where the engine to directly drive the ring The engine is already clutched to the motor-generator, so a straight-through mechanical is established when the ring’s clutch is engaged.

Compared to 3, the engine works harder because it is simultaneously driving the gear and the shaft of the generator.

Getting the Terms Right

GM out that the different planetary used by the Toyota Prius makes its engine come on in 2. On the other hand, GM’s system has three clutches, the Prius HSD system has exactly

GM also reminds us that the gasoline engine (premium required, by the way) never drives the car without the help of an motor. That’s true, in Mode 4 where the sun is still turned by the main traction But the same is true of every Lexus, Nissan and Toyota produced to date.

None of gasoline engines can move an inch without an electric applying torque to one of their elements.

Including the Volt, all hybrids burn gas some of the while they’re moving. what makes them The Volt is no different except for the head start GM claims it before the engine fires up.

The closest is the Toyota Prius which offers 15 miles of range.

Such performance the 2011 Chevrolet Volt to the right endpoint than the Prius Plug-In, but not as far to the right as all-electric vehicles like the E and Nissan Leaf .

The Sawtooth

Turns out, the right may not be where you want to be. EVs come a leash. You can’t forget to them or trip a circuit while you sleep. You have to every move and strike the spontaneity and road trip your personal vocabulary.

You’ll need a second

As it turns out, we might been looking at our line in the way. Imagine it as an incline swiftly rises as it progresses the right-hand side of the paper. The is close to the summit in practical but electric vehicles at the far right off the cliff of practicality because of an limit to driving range, a long recharge time for you at the end.

At some point technology, quick-charging and a fully electric infrastructure will most or all of the range limitations with electric cars, but not there, not by a long shot.

hybrids like the 2011 Volt might actually be the sweet spot along our We wonder why GM is so anxious to make think the 2011 Chevrolet is an EV when they might be on something much better.

Chevrolet Electric Cars
Chevrolet Electric Cars
Chevrolet Electric Cars
Chevrolet Electric Cars


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