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The Workshop Manual, Section 414-01, Description and Operation has been updated on all 2020 and later vehicles with a new folder called Battery Load Shed .
This folder has information on systems that are affected by battery state of charge during any vehicle system diagnostics.
The electrical consumption control is using Ignition_Status, Remote_Start_Status and EngineStateInternal in order to define the load management strategy during the different operating states of the vehicle.
The BCM is the primary module that is responsible for controlling the load management strategy. The BCM processes measurements of the system and uses the information for calculations and load prioritization
The strategy allows drain to occur from the battery. Load Management minimizes the drain by controlling the time and magnitude of the drain that can occur. The battery drain changes depending on the driving cycle and the types of loads the driver has activated, therefore, the BCM must be able to shut down or reduce the loads if necessary. The intent of the initial load shed stage, LSHED1, is to reduce electrical loads in a manner that is not noticed by the vehicle operator.
During LSHED1, requests are sent in a prioritized order for the appropriate modules to begin shedding available loads. In order to prevent customer satisfaction issues, the loads are requested to reduce power consumption with minimum impact to the customer.
The second load shed event, LSHED2, occurs in two stages, SHED2_TRANS and SHED2_CONTIN. During operation of a vehicle equipped with large transient loads, there are transient peaks for current draw. The Load Management algorithm reacts to these spikes by using the SHED2_TRANS state. This state requires all non-critical loads to shed immediately, without customer indication, so that large transient loads can operate normally with little to no adverse impact to the customer. SHED2_CONTIN is a continuous deactivation of the loads to ensure the vehicle is able to re-start once the ignition is turned off. During SHED2_CONTIN, a message is displayed to the vehicle operator notifying them of the vehicle's charging system status.
Independent of load shed requests, the Load Management control can request boosts to the engine idle speed. Boosting the engine idle speed allows for increased output of the alternator to deliver more current to the battery. Idle speed increases are done through network IBoost messages.
The load shed charts provide a general overview of the features available on the vehicle based on the build options.
Load Shed Charts
Priority List Load Shedding 1
Priority List Load Shedding 2
Priority List Load Shedding Engine Off
© Copyright 2023, Ford Motor Company.
The Workshop Manual, Section 414-01, Description and Operation has been updated on all 2020 and later vehicles with a new folder called Battery Load Shed .
This folder has information on systems that are affected by battery state of charge during any vehicle system diagnostics.
| 414-01 Battery, Mounting and Cables | 2020 Expedition |
| Description and Operation |
Battery Load Shed
The main purpose of controlling electrical consumption with a load management strategy is to:- Limit battery discharge
- Monitor the battery charge status
- engine idle
- cold climate with a lot of electrical heating functions active
- warm conditions with the engine cooling fan running
- large transient loads (i.e. EPAS )
The electrical consumption control is using Ignition_Status, Remote_Start_Status and EngineStateInternal in order to define the load management strategy during the different operating states of the vehicle.
The BCM is the primary module that is responsible for controlling the load management strategy. The BCM processes measurements of the system and uses the information for calculations and load prioritization
The strategy allows drain to occur from the battery. Load Management minimizes the drain by controlling the time and magnitude of the drain that can occur. The battery drain changes depending on the driving cycle and the types of loads the driver has activated, therefore, the BCM must be able to shut down or reduce the loads if necessary. The intent of the initial load shed stage, LSHED1, is to reduce electrical loads in a manner that is not noticed by the vehicle operator.
During LSHED1, requests are sent in a prioritized order for the appropriate modules to begin shedding available loads. In order to prevent customer satisfaction issues, the loads are requested to reduce power consumption with minimum impact to the customer.
The second load shed event, LSHED2, occurs in two stages, SHED2_TRANS and SHED2_CONTIN. During operation of a vehicle equipped with large transient loads, there are transient peaks for current draw. The Load Management algorithm reacts to these spikes by using the SHED2_TRANS state. This state requires all non-critical loads to shed immediately, without customer indication, so that large transient loads can operate normally with little to no adverse impact to the customer. SHED2_CONTIN is a continuous deactivation of the loads to ensure the vehicle is able to re-start once the ignition is turned off. During SHED2_CONTIN, a message is displayed to the vehicle operator notifying them of the vehicle's charging system status.
Independent of load shed requests, the Load Management control can request boosts to the engine idle speed. Boosting the engine idle speed allows for increased output of the alternator to deliver more current to the battery. Idle speed increases are done through network IBoost messages.
The load shed charts provide a general overview of the features available on the vehicle based on the build options.
Load Shed Charts
Priority List Load Shedding 1
| Priority List Load Shedding 1, Engine Running | System Affected | Battery State Of Charge (SOC) | Battery Voltage |
| Charging system at 95 % capacity | Heated washer fluid | Below 62% | Below 11.6 Volts |
| Heated steering wheel | |||
| Smart trailer tow battery charge | |||
| Heated and cooled seats | |||
| Heated back glass, Heated mirrors | |||
| Heated wind screen (windshield) | |||
| Rear Aux blower | |||
| Engine cooling fan |
Priority List Load Shedding 2
| Priority List Load Shedding 2, Engine Running (which includes load shedding 1) | System Affected | Battery State Of Charge (SOC) | Battery Voltage |
| Charging system at 95 % capacity | Energy management relay | Below or equal to 50% | Below 9 Volts |
| Non-Chime related information | |||
| 110 volt inverter | |||
| 12 volt power points | |||
| Ambient lighting | |||
| Manual climate control blower (less FMVSS required for operation) | |||
| NOTE: The electric booster heater has it's own Load Management strategy which includes idle boost request to the PCM and current limiting capabilities. Electric booster heater |
Priority List Load Shedding Engine Off
| Priority List Load Shedding Engine Off | System Affected | Battery State Of Charge (SOC) | Battery Voltage |
NOTE: Battery SOC threshold may increase slightly as the battery temperature gets colder (i.e. < 0°C /32°F)
| Heated washer fluid | Loads determined by the engine off timer by the BCM sets the load control status | |
| Heated steering wheel | |||
| Smart trailer tow battery charge | |||
| Heated and cooled seat (Rear Driver) - stage 3 | |||
| Heated and cooled seat (Rear Passenger) - stage 3 | |||
| Heated seat Only (Rear Driver) | |||
| Heated seat Only (Rear Passenger) | |||
| Heated wind screen (windshield) | |||
| Dual automatic climate control front blower (less FMVSS required for operation) | |||
| Manual climate control blower (less FMVSS required for operation) | |||
NOTE: Battery SOC threshold may increase slightly as the battery temperature gets colder (i.e. < 0°C /32°F)
| Heated back glass, Heated mirrors | Loads determined by the engine off timer by the BCM sets the load control status | |
| Split-screen Heated back glass, Heated mirrors | |||
| Energy management relay | |||
| Infotainment | |||
| Electronic Finish Panel (less FMVSS required operation) | |||
| 110 volt inverter | |||
| 12 volt power points | |||
| Ambient lighting |
© Copyright 2023, Ford Motor Company.
