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Electrical Power Management Block Diagram

Fig 1: Electrical Power Management Block Diagram
GM3621782Courtesy of GENERAL MOTORS COMPANY
Callout Component Name
K9 K9 Body Control Module
K20 K20 Engine Control Module
G13 G13 Generator
Idle Boost and Load Shed With Current Sensor

Function Battery Temperature Calculation Battery Voltage Calculation Amp-Hour Calculation Action Taken
Idle Boost 1 Start Less Than -15°C (5°F) Less Than 13 V - First level Idle boost requested
Idle Boost 1 Start - - Battery has a net loss greater than 0.6 Ah First level Idle boost requested
Idle Boost 1 Start - Less Than 11 V - First level Idle boost requested
Idle Boost 1 End Greater Than -10°C (14°F) Greater Than 12 V Battery has a net loss less than 0.2 Ah First level Idle boost request cancelled
Idle Boost 2 Start - - Battery has a net loss greater than 1.6 Ah Second level Idle boost requested
Idle Boost 2 Start - Less Than 11 V - Second level Idle boost requested
Idle Boost 2 End - Greater Than 12 V Battery has a net loss less than 0.8 Ah Second level Idle boost request cancelled
Load Shed 1 Start - - Battery has a net loss of 4 Ah Rear Defrost, Heated Mirrors, Heated Seats, HVAC cycled OFF for 20% of their cycle
Load Shed 1 Start - Less Than 11 V - Rear Defrost, Heated Mirrors, Heated Seats, HVAC cycled OFF for 20% of their cycle
Load Shed 1 End - Greater Than 12 V Battery has a net loss of less than 2 Ah Clear Load Shed 1
Idle Boost 3 Start - - Battery has a net loss of 10 Ah Third level Idle boost requested
Idle Boost 3 Start - Less Than 11 V - Third level Idle boost requested
Idle Boost 3 End - Greater Than 12 V Battery has a net loss of less than 6.0 Ah Third level Idle boost request cancelled
Load Shed 2 Start - - Battery has a net loss greater than 12 Ah Rear Defrost, Heated Mirrors, Heated Seats, HVAC cycled OFF for 50% of their cycle. The BATTERY SAVER ACTIVE message will be displayed on the DIC
Load Shed 2 Start - Less Than 11 V - Rear Defrost, Heated Mirrors, Heated Seats, HVAC cycled OFF for 50% of their cycle. The BATTERY SAVER ACTIVE message will be displayed on the DIC
Load Shed 2 End - Greater Than 12 V Battery has a net loss of less than 8 Ah Clear Load Shed 2
Load Shed 3 Start - Less Than 11.9 V Battery has a net loss greater than 20 Ah Rear Defrost, Heated Mirrors, Heated Seats, HVAC cycled OFF for 100% of their cycle. The BATTERY SAVER ACTIVE message will be displayed on the DIC
Load Shed 3 Start - Less Than 11 V - Rear Defrost, Heated Mirrors, Heated Seats, HVAC cycled OFF for 100% of their cycle. The BATTERY SAVER ACTIVE message will be displayed on the DIC
Load Shed 3 End - Greater Than 12.6 V Battery has a net loss of less than 13 Ah Clear Load Shed 3
Idle Boost and Load Shed Without Current Sensor (based on battery voltage)

Function Battery Temperature Calculation Battery Voltage Calculation Action Taken
Idle Boost 1 Start Less Than -15°C (5°F) Less Than 13 V First level Idle boost requested
Idle Boost 1 Start - Less Than 12.6 V First level Idle boost requested
Idle Boost 1 End Greater Than -15°C (5°F) - First level Idle boost request cancelled
Idle Boost 1 End - Greater Than 13 V First level Idle boost request cancelled
Idle Boost 2 Start - Less Than 12.4 V Second level Idle boost requested
Idle Boost 2 End - Greater Than 12.5 V Second level Idle boost request cancelled
Load Shed 1 Start - Less Than 12.3 V Rear Defrost, Heated Mirrors, Heated Seats, HVAC cycled OFF for 20% of their cycle
Load Shed 1 End - Greater Than 12.4 V Clear Load Shed 1
Idle Boost 3 Start - Less Than 10 V Third level Idle boost requested
Idle Boost 3 End - Greater Than 12.3 V Third level Idle boost request cancelled
Load Shed 2 Start - Less Than 12.1 V Rear Defrost, Heated Mirrors, Heated Seats, HVAC cycled OFF for 50% of their cycle. The BATTERY SAVER ACTIVE message will be displayed on the DIC
Load Shed 2 End - Greater Than 12.2 V Clear Load Shed 2
Load Shed 3 Start - Less Than 11.9 V Rear Defrost, Heated Mirrors, Heated Seats, HVAC cycled OFF for 100% of their cycle. The BATTERY SAVER ACTIVE message will be displayed on the DIC
Load Shed 3 End - Greater Than 12.0 V Clear Load Shed 3
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