Dodge 2009 Aspen Owner's Manual page 58

56 STARTING AND OPERATING
Engine
The engine speed in your hybrid vehicle is not directly
tied to your vehicle speed. Your vehicle's engine and
transmission are designed to provide the power you need
at the most efficient engine speed.
Regenerative Braking
Your Hybrid vehicle has a unique Regenerative Braking
System (RBS). The RBS can result in extended life of the
hydraulic service brakes; however, all inspection, sched-
uled maintenance, and service intervals for the vehicle
service brakes must be followed. The RBS is used to
recharge the high voltage battery under certain driving
and braking conditions. The RBS recaptures energy that
would otherwise be lost while braking. The electric
motors which propel the vehicle forward can operate as
generators when braking. The brake system uses conven-
tional hydraulic friction brakes, regenerative braking, or
a combination to slow vehicle. The electric power that is
generated goes back into the high voltage battery for later
use, for example when acceleration is desired. RBS in-
creases the fuel economy of the vehicle, particularly in
stop-and-go city traffic. If the system detects slippery
conditions only friction is used to slow the vehicle.
The brake pedal on this Hybrid vehicle will feel different
from a conventional vehicle due to the RBS. This is
normal. After start-up, during the first brake apply, the
brake system is undergoing a self-test function. The brake
pedal travel will be longer then usual. This is normal.
Press firmly on the brake to prevent rolling. The driver is
always responsible for stopping the vehicle.
Climate Control (HVAC System)
Your Hybrid vehicle uses automatic temperature control
(ATC) HVAC system with specialized components. This
HVAC system utilizes a humidity sensor, cabin infrared
(IR) sensor, sun sensor, and ambient temperature sensor
to choose operation mode and control cabin comfort.
Your Hybrid vehicle also uses a heater auxiliary pump to
provide heat to the cabin while the vehicle is in electric