The Pentastar also includes pulse-width modulation, a new fuel-saving technology that reduces unwanted parasitic electrical load, Chrysler said. The PWM system has a sensor at the fuel rails that handles fuel-pressure needs, allowing the primary fuel pump to be controlled “like a light dimmer switch,” modulating fuel delivery and improving the longevity of the pump, the company said.
The PWM technology also lets the radiator’s high-current electric cooling fan run at different speeds, by monitoring engine temperature and adjusting fan speed to compensate for changes in temperature.
Other changes aimed at saving fuel include variable valve timing, engine stop-start systems and an interactive deceleration fuel shut-off.
Even the electric power steering system saves fuel, Chrysler said, thanks to an electric motor that powers the rack-and-pinion steering system. The electric motor produces a 1.8% fuel economy improvement over a traditional hydraulic pump while producing 5% more horsepower, the company said.