Archive for the ‘engine stop-start system’ Tag

Stop, Start, Save – Fuel-Saving Technology Standard on Jeep Cherokee

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

Jeep Cherokee customers who choose the available 3.2-liter Pentastar
V-6, and Chrysler 200 customers who opt for the 2.4-liter Tigershark
I-4, and will 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.”

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

Availability in the popular Jeep Cherokee is scheduled for third
quarter. ESS arrives the following quarter in the all-new Chrysler 200.

ESS works this way:

– 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

– Beefier batteries maintain other vehicle systems so in-cabin comfort is unaffected

– When the brake pedal is released, the engine automatically restarts and the nine-speed automatic transmission, the segment-exclusive
nine-speed automatic transmission is engaged – all within 0.3 seconds

If a driver chooses to forgo the benefits of ESS, the feature can be
deactivated with the push of a button, and then reactivated.

Efficiency and refinement are hallmarks of the Tigershark and Pentastar engine families. ESS just complements these attributes.

The Cherokee’s available 271-hp 3.2-liter Pentastar V-6 is derived
from the acclaimed 3.6-liter Pentastar V-6, named three times one of
Ward’s 10 Best Engines. The smaller-displacement V-6 helps the Cherokee
deliver fuel-economy improvements of up to 30 percent, compared with the
model it replaces.

Individual exhaust-manifold runners are integrated into the aluminum
cylinder-head casting, a key Pentastar-family differentiator. This
design feature reduces weight and affords packaging benefits.

The 24-valve engine’s 10.7:1 compression ratio aids in lowering fuel
consumption and improves performance while its variable-displacement oil
pump further reduces parasitic losses to maximize fuel economy. The
pump is programmed to operate as needed, staying in low-pressure mode
below 3,500 rpm, and then bumping up pressure as demand follows
engine-speed.

The high-tech transmission – which also comes standard in the Jeep
Cherokee – dispenses power smoothly for elevated refinement. Such
performance is made possible because the ratio steps between its gears
are smaller than those of other transmissions.

The Jeep Cherokee has earned multiple media accolades, from Rocky
Mountain Automotive Press Association’s SUV of the Year to 2014 Canadian
Utility Vehicle of the Year, courtesy of the Automobile Journalists
Association of Canada (AJAC).

As read on: http://www.chryslergroup360.com/featured_news/stop-start-save/

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Standard stop-start on some Cherokees, 200s

Engine Stop-Start (ESS) systems will be standard equipment on certain models of the 2015 Jeep Cherokee and 2015 Chrysler 200 mid-size sedan. The system will be used on four-cylinder 200s and V6 Cherokees; fuel economy should rise by around 3% with the new systems, which our sources claim are based on belt-driven generators.

The setup should become available in the Jeep Cherokee in the third quarter, and in the 200 in the fourth quarter. The setup is currently used in one version of the Ram 1500, where it saves one mile per gallon (city).

The ESS system uses a high-speed/high-durability starter that reduces crank time, for quicker restarts. Passive accelerator application is met with measured throttle response; hard inputs trigger aggressive starts. Chrysler claims, “there’s no waiting for either.”

When the engine comes to a stop, if it is warm enough for an immediate restart and there is sufficient reserve battery power, the engine is cut off, saving fuel. Heavier batteries maintain other vehicle systems, including the fan. When the brake is released, the engine automatically restarts (rather than waiting for the driver to use the accelerator), and the transmission re-engaged, within one third of a second. The feature can be deactivated by the driver at will.

As read on: http://www.allpar.com/news/index.php/2014/06/standard-stop-start-on-some-cherokees-200s