General Motors has unveiled the Buick Regal Hybrid at the Chicago Auto Show.The Buick Regal Hybrid is expected to have similar consumption figures as the LaCrosse, as the e-Assist will enable a 25 percent boost in efficiency. This means that the 2.4-litre 4-cylinder engine powering the Buick Regal Hybrid which will use a six-speed transmission will most probably return around 31 mpg (combined cycle) / 7,9-litres per 100 Km.
The same 17-inch lightweight alloy wheels (and low rolling resistance tires) are used on both Buicks. Thanks to the Regal’s smaller size, however, the wheels don’t appear as undersized as they do on the LaCrosse. If the driver is in an especially green mood, the car can be put into a fuel economy optimizing mode with the AC unit that allows for more frequent and longer engine stop periods.
The Buick Regal with e-Assist is more likely to be marketed as a premium engine choice for buyers of the compact sedan, unlike the current setup for the LaCrosse full-size four-door where the hybrid version has become the vehicle’s entry-level model. GM has cited cost concerns which prevent the Regal from enjoying the same ultra-thrifty base drivetrain.
Press Release
2012 Regal to Offer New eAssistTMFuel-Saving Technolog y
- eAssist"light electrification" system improves fuel economy 25 percent
- Estimated 26 mpg city / 37 mpg highway (pending EPA certification)
- On sale this fall
A driver-selectable, fuel economy-optimizing mode for the air conditioning system, which enables more frequent and longer-duration engine stop periods
An ECO gauge on the instrument panel that continuously responds to driving behavior, enabling the driver to drive with greater efficiency
A powerflow readout in the 7-inch infotainment screen, which shows the flow of energy through the electric assist system, such as battery charging from regeneration and electric power directed to the engine.
eAssist details
Mated to Regal's 2.4L Ecotec direct injection four-cylinder engine and next-generation six-speed automatic transmission, the eAssist system uses power stored in the battery to provide needed electrical boost in various driving scenarios, optimizing engine and transmission operation. An advanced 115V lithium-ion battery and latest-generation 15-kW induction motor-generator unit help increase fuel economy through: Regenerative braking, which provides up to 15 kW of electricity to charge the battery
Providing up to 11 kW (15 hp) of electric power assistance during acceleration
Automatic engine shut-off when the vehicle is stopped
Aggressive fuel cut-off during deceleration down to zero vehicle speed, enabled by the torque smoothing provided by the induction motor-generator unit
Intelligent charge/discharge of the high-voltage battery.
"The capability to deliver electric boost to the powertrain system during heavy acceleration and grade driving enables the engine and transmission to operate more efficiently," said Steve Poulos, global chief engineer of the eAssist system."Full fuel shutoff at stops and during deceleration complements electric boost and regenerative braking with additional fuel savings." Regal with eAssist technology also features improved underbody aerodynamics and tires optimized for performance and fuel economy. It also features a hill-assist system that captures brake pressure to help the driver more comfortably accelerate from a stop on a moderate or steep grade. It does this by greatly reducing the tendency of the vehicle to roll backward with the engine in shut-down mode. The eAssist system's 115V air-cooled lithium-ion battery bolsters the 2.4L Ecotec four-cylinder engine with approximately 11 kW (15 hp) of electric power assist during heavy acceleration and 15 kW of regenerative braking power. The system also enables the Ecotec engine to shut down fuel delivery in certain deceleration conditions, which saves additional fuel. While in fuel shut-off mode, the induction motor-generator unit continues spinning along with the engine to provide immediate and smooth take-off power when the driver presses on the accelerator. Then, as the vehicle comes to a stop, the induction motor-generator unit spins the engine, bringing it to a smooth stop - properly positioned for a smooth restart."The battery system is designed to provide power assistance to the internal combustion engine, rather than store energy for all-electric propulsion," said Poulos."It's really an extension of the conventional internal combustion engine, not a replacement for it." The eAssist power pack contains the lithium-ion battery pack, the integrated power inverter and 12V power supply. It is located in a compartment between the rear seat and trunk; and it is surprisingly compact and lightweight, weighing only about 65 pounds (29 kg). Trunk space is slightly reduced when compared with 2011 models with the four-cylinder/six-speed powertrain, but still offers 11.1 cubic feet (314 liters) of storage. A quiet electric fan cools the power pack, drawing air from a vent located in the package tray, behind the rear seat. The eAssist system's electric induction motor-generator is mounted to the engine in place of the alternator to provide both motor assist and electric-generating functions through a unique engine belt-drive system. The induction motor-generator is a high-performance, compact induction motor that is liquid-cooled for increased performance and efficiency. Next-generation six-speed
The eAssist system works with Regal's direct injected 2.4L Ecotec four-cylinder and next-generation six-speed automatic powertrain combination. In the Regal with eAssist, the engine is rated at 182 horsepower (136 kW) and the next-generation Hydra-Matic 6T40 takes transmission technology to the next level with features designed to enhance powertrain efficiency. Significant internal transmission changes to clutch controls and hardware provide reduced spin losses while improving shift response and time. The added electric power provided by the eAssist system allows for higher gearing to improve steady state efficiency without impacting acceleration performance or driveability. The system's ability to provide some electric assistance at cruising speeds allows the driver to accelerate lightly or ascend mild grades without the transmission downshifting. An auxiliary, electric-driven transmission oil pump is added to the 6T40, which keeps the transmission primed and the fluid flowing when the engine shuts down at a stop. That keeps the transmission ready to perform when the driver accelerates, for a seamless, uncompromised driving experience.
2012 BUICK REGAL PRELIMINARY SPECIFICATIONS
Overview36.8 / 935 (rear)
37.3 / 947 (rear)
54.4 / 1382 (rear)
52.3 / 1328 (rear)