Stop-start is now offered as standard on 2015 Chevrolet Impala with 2.5-liter engine

Article by Andrew Christian, on May 24, 2014

Stop-start technology will be offered as standard on the 2015 Chevrolet Impala’s base 2.5-liter engine, General Motors has disclosed. The technology improves the new Impala’s fuel economy by 5 percent. According to GM spokesman Chad Lyons, the implementation of stop-start technology in the Impala is part of the carmaker’s bid to widen the use of the system in its vehicles.

He said that the stop-start technology will become “more prevalent” in GM vehicles. The stop-start technology improves fuel economy by turning off the engine in certain conditions like stop-and-go traffic.

The revamped Impala has become a flagship vehicle for Chevrolet and is the second GM vehicle to offer the stop-start technology as standard. The 2014 Chevrolet Malibu was the first GM unit to offer the system as standard, improving its fuel economy by around 14 percent.

The 3.6-liter engine Impala will not be offered with the stop-start system as standard due to its weight. Lyons remarked that the technology is not so effective in a heavier engine.

According to a Navigant Research report, sales of vehicles laden with stop-start technology will surge to 55.4 million units in 2022 from 8.8 million in 2013. GM will start rolling out the 2015 Impala this summer.

“Stop/start system customer research indicates they want the engine to start up as quickly and smoothly as possible after a stop,” said Mark Meyers, Chevrolet Global Vehicle Performance manager.

The 2.5-liter Impala will have a starting price of $27,735 while the 3.6-liter Impala will have a base tag of $30,960. Both prices include shipping.

Press Release

Chevrolet Makes Stop/Start Standard in 2015 Impala

Stop/start technology will be standard on the 2015 Impala base 2.5-liter ECOTEC® engine, an addition that improves the vehicle’s city fuel economy by nearly 5 percent, or one mile per gallon.

The Impala comes standard with a four-cylinder engine, which currently accounts for more than 30 percent of Impala retail sales. It offers customers higher mpg city ratings and a more affordable entry price into the segment than six-cylinder competitors.

Stop/start shuts down the engine in certain driving conditions to reduce fuel consumption. The technology is becoming more prevalent worldwide. A recent report from Navigant Research predicted worldwide sales of vehicles with stop/start technology will grow from 8.8 million in 2013 to 55.4 million in 2022.

The 2.5L Impala with stop/start yields an EPA-estimated fuel economy of 22 mpg city, 31 for the highway and 25 combined. The Impala with the 3.6L V-6 engine will not include stop/start technology.

The Impala becomes the second vehicle in Chevrolet’s U.S. lineup to feature stop/start technology, following the segment-first standard inclusion in the 2014 Malibu introduced late last year. The technology helps improve the Malibu’s city fuel economy by 14 percent.

Chevrolet engineers developed the stop/start in the Impala from extensive experience with GM’s eAssist system and the accompanying algorithms that allow engines to engage and disengage subtly.

During the development of this technology, a team of software engineers was created. The Center for Excellence focuses on advancing stop/start technology and making its operation seamless to the customer.

A big challenge for the team was overcoming “change-of-mind events,” instances in which the driver begins to stop, but then quickly accelerates. The algorithms adapt the system so the starter can fire even if the engine did not fully shut off.

The smart software also prevents the system from engaging if the car does not reach 6 mph since its last start, a welcome feature in stop-and-go-driving conditions. The system also considers cabin temperature, humidity, battery charge and other factors when deciding if the engine should come to a stop.

Hardware revisions also have been made. The noise and vibration team worked closely with drivetrain engineers to revise motor mounts to provide the greatest isolation possible from the cabin. Additionally, the team included a larger heavy-duty starter motor to assist with the additional ignition cycles.

The 2015 Impala goes on sale this summer with a suggested starting price of $27,735 for the 4-cylinder LS model, and $30,960 for the 6-cylinder LT model. These include an $825 destination charge, but exclude tax, title, license and dealer fees.

For the 2015 model year, the Impala will be available with two powertrains, a standard 2.5L engine with stop/start, and a premium 3.6L six-cylinder engine.

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