Stop-start technology is showing up for 2015 in two Chrysler Group vehicles, the Jeep Cherokee and the Chrysler 200 sedan.

Chrysler Group announced it is offering Engine Stop-Start (ESS) technology as standard equipment on certain models of the 2015 Jeep Cherokee mid-size SUV and all-new 2015 Chrysler 200 mid-size sedan.

Chrysler 200 customers who opt for the 2.4-liter Tigershark MultiAir four cylinder engine, and Jeep Cherokee customers who choose the available 3.2-liter Pentastar VVT V6, will have vehicles equipped with the company’s ESS technology. Chrysler stated these customers should experience estimated fuel-economy improvements of up to three percent, compared with the conventional vehicle-engine pairings.

“We’re taking highly efficient engines and upping the ante to further benefit our customers,” said Mike Duhaime, Global Director-Electrified Powertrain Propulsion Systems. “ESS leverages intricate control strategies to deliver a superior driving experience, as well as the expected fuel-savings and emissions-reduction.”

Chrysler added ESS applications in the Chrysler 200 and Jeep Cherokee will also account for an estimated C02 emissions-reduction of up to three percent.

The company’s application of the technology made its NAFTA-region debut in the Ram 1500 full-size pickup. Availability in the Jeep Cherokee is scheduled for third quarter of 2014. ESS arrives the following quarter in the Chrysler 200.

Describing the ESS system, Chrysler said at its heart is a high-speed/high-durability starter that reduces crank time, culminating in quicker restarts. Its function is regulated by algorithms that act on a vehicle’s powertrain and chassis components.

ESS works this way, in Chrysler’s words:

  • Engine controls constantly monitor vehicle speed
  • When the vehicle brakes to a stop, fuel flow is cut and engine turns off – events that save gas and reduce emissions
  • Larger batteries maintain other vehicle systems so in-cabin comfort is unaffected
  • When the brake pedal is released, the engine automatically restarts and the transmission is engaged – all within 0.3 seconds

If needed, ESS can be deactivated and reactivated with the push of a button.

Chrysler added the 2015 Chrysler 200 is the world’s first mid-size sedan to feature a nine-speed automatic transmission, which comes standard and contributes to a fuel-economy gain of up to 26  percent compared with the outgoing car and its four-speed gearbox. The high-tech transmission – which also comes standard in the Jeep Cherokee – is said to dispense power smoothly for elevated refinement. Such performance is made possible because the ratio steps between its gears are smaller than those of other transmissions.