![]() ![]() But this is really a study in rightsizing, rightsizing an internal combustion engine for this extended range capability. This engine obviously has the capability of revving much higher and producing much more output. #CHEVY VOLT RANGE EXTENDER ENGINE GENERATOR#The resulting Volt drive unit consists of two motors-a 111 kW main traction and 63 kW (at 4800 rpm) generator motor (55 kW generator output)-as well as three clutches and a planetary gear set tucked in the end of the traction motor that improve overall efficiency by reducing the combined rotational speed of the electric motors as needed. They thus decided to exploit the generator motor more thoroughly than it would otherwise have been if used exclusively as a generator in extended-range driving. Recognizing the benefits derived from their two-mode approach in their earlier hybrids, the engineering team also observed that they had a second motor-the generator motor-“ going along for the ride”, as Fletcher said during her presentation at the launch event in Detroit. Mechanical losses such as friction and windage dictate that the efficiency of an electric motor declines somewhat as motor speed increases. Pam Fletcher, Global Chief Engineer for Volt and Plug-In Hybrid Electric Powertrains That’s ultimately what the customer is looking for, is to maximize this notion of electric range, to maximize this notion of efficiency of the generator when we have to use it. How do we take all this battery energy.and very efficiently and effectively drive the wheels. The story of the electric drive is really a story about efficiency. Put another way, the GM team wanted to extend the range of the vehicle as efficiently as possible, while maintaining quality driving dynamics and experience. Given that GM had committed to a combustion engine and a generator as a range extender for the battery, the engineering team set out to develop a drive system that could maximize the combined efficiency of all the components under the different driving modes (all battery electric, and extended range). #CHEVY VOLT RANGE EXTENDER ENGINE SERIES#(The Volt could also be called a plug-in series hybrid, depending upon your taxonomic preference.) The second generation Volt also benefits from a reengineered and re-packaged two-motor drive unit that is said to operate 5 to 12 percent more efficiently than the current system and weighs 100 pounds (45 kg) less.The Volt is an electric-drive vehicle, powered by a 16 kWh Li-ion battery, incorporating an internal combustion engine and generator to serve as a range extender an electrical plug is intended to be the primary source of stored energy used to deliver motive power. “So our team created a new battery system that will exceed the performance expectations of most of our owners.” “It would have been simple for us to tweak our existing battery to provide nominally increased range, but that’s not what our customers want,” said Larry Nitz, executive director of GM Powertrain’s electrification engineering team. ![]() There’s a new lithium ion battery pack with revised cell chemistry made in cooperation with LG Chem, which increases storage capacity by 20 percent on a volume basis when compared to the original cell, while the number of cells decreases from 288 to 192. GM has replaced the previous 1.4-liter four-cylinder range-extender engine with a larger, but more fuel efficient, 1.5-liter unit that will initially be built at GM’s Toluca, Mexico engine plant for the first year of production, then shift to the Flint, Michigan engine plant. ![]()
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