Chevrolet 2008 Uplander Spezifikationen PDF herunterladen (Seite 180)

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101

Electric Power Management

The vehicle has Electric Power Management (EPM)

that estimates the battery’s temperature and state

of charge. It then adjusts the voltage for best

performance and extended life of the battery.

When the battery’s state of charge is low, the voltage is

raised slightly to quickly put the charge back in. When

the state of charge is high, the voltage is lowered slightly

to prevent overcharging. If the vehicle has a voltmeter

gage or a voltage display on the Driver Information

Center (DIC), you may see the voltage move up

or down. This is normal. If there is a problem,

an alert will be displayed.

The battery can be discharged at idle if the electrical

loads are very high. This is true for all vehicles.

This is because the generator (alternator) may

not be spinning fast enough at idle to produce all

the power that is needed for very high electrical loads.

A high electrical load occurs when several of the

following loads are on: headlamps, high beams, fog

lamps, rear window defogger, climate control fan at

high speed, heated seats, engine cooling fans, trailer

loads, and loads plugged into accessory power outlets.

EPM works to prevent excessive discharge of the

battery. It does this by balancing the generator’s output

and the vehicle’s electrical needs. It can increase engine

idle speed to generate more power, whenever needed.

It can temporarily reduce the power demands of some

accessories.

Normally, these actions occur in steps or levels, without

being noticeable. In rare cases at the highest levels of

corrective action, this action may be noticeable to the

driver. If so, a Driver Information Center (DIC) message

might be displayed, such as Battery Saver Active or

Service Battery Charging System. If this message is

displayed, it is recommended that the driver reduce the

electrical loads as much as possible. See DIC Warnings

and Messages on page 3-58.

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