![]() In Gen2, the two motors share both roles.Įach of the two propulsion motor-generators is geared to a common main transmission shaft using an individual planetary gear set. While the first-generation Volt also featured two motors, the roles were split between the 111 kW main traction motor and 63 kW generator motor. Click to enlarge.Ī key decision was to split EV propulsion between two motor-generators (motors A and B). Schematic lever diagram showing the gearing of each of the two propulsion motor-generators to a common main transmission shaft using an individual planetary gear set. The powerflow was capable of operating at high vehicle speeds both as an EV and with engine on.ĭrive unit power flow. The planetary gear ratios required for efficient operation with engine on also resulted in gear ratios that were suitable for electric motor traction drives, with similar speed ratios between the two motors and the transmission output. The resulting powerflow concept selected contained several features especially well-suited to electric vehicle propulsion: Out of this, the GM team selected several systems for more intensive study and comparison with two benchmark systems from other OEMs. ![]() About half of these were chosen for energy modeling in both EV and extended range operation, using a simulation tool developed by GMR&D. ![]() A team from GM Research and Development (GMR&D), Advanced Engineering, and Product Engineering examined more than 50 types of electric and hybrid propulsion systems to find the best type for the second-generation Volt. ![]() GM took a blank-sheet approach to designing the second-generation system. Transaxle configuration and operating modes. The range-extending engine is a 1.5-liter four-cylinder, naturally-aspirated direct-injection spark-ignition engine with sufficient power to continue normal driving after most of the battery energy has been depleted by EV driving or during conditions when available battery power is low because of extreme temperatures. The drive unit contains two newly developed electric motor-generators for propelling the vehicle and other duties power electronics to supply and control them a system of gears, clutches, and hydraulic controls to combine and deliver the mechanical power from the motor-generators and the engine and an electric oil pump. The major components of the propulsion system are the battery pack, the drive unit, and the engine. Whether the vehicle is operating in EV or range extended mode. Smooth, unobtrusive, power on demand regardless of.Increased charge sustaining fuel economy.(A fifth paper presented at the World Congress assessed one year of in-use operating data from first-generation Chevrolet Volt and projected the performance of the second generation.)įor the second-generation, GM wanted to enhance the electric performance of the Volt. A GM analysis of vehicle data collected from first generation found that Volt vehicles were driven more than half a billion miles in North America from October 2013 through September 2014, and that 74% of the miles were all-electric. In designing the second-generation system, GM engineers built on the knowledge and data gained from the first-generation Volt. ![]()
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