Lincoln Corsair: Rear Electric Drive Assembly / Description and Operation - Rear Electric Drive Assembly - System Operation and Component Description

System Operation

System Diagram

E370042 *.sttxt { visibility: hidden; } *.stcallout { visibility: visible; } 1 TCM private CAN 2 Resolver 3 Front Electric Drive Assembly 4 ISC SOBDMC 5 GSM 6 PCM 7 S-ISC SOBDM-B 8 Secondary Resolver 9 Rear Electric Drive Assembly 10 APIM 11 BCM 12 BCMC 13 BECM 14 DC/DC 15 GWM 16 SOBDM

Item	Description
1	TCM private CAN
2	Resolver
3	Front electric drive assembly
4	Inverter System Controller (ISC)/SOBDMC
5	GSM
6	PCM
7	Secondary Inverter System Controller (S-ISC)/SOBDMB
8	Secondary resolver
9	Rear electric drive assembly
10	APIM
11	BCM
12	BCMC
13	BECM
14	DCDC
15	GWM
16	SOBDM

  Network Message Chart - Secondary Inverter System Controller (S-ISC)

Broadcast Message	Originating Module	Message Purpose
ABS Active Flag	ABS	Used to determine the status of the ABS system
Battery Voltage	BCM	Used to determine the battery voltage
Battery Voltage	DCDC	Used to determine the battery voltage
Battery Voltage	BCM	Used to determine the battery voltage
Battery Traction Status	BECM	Used to determine the engagement of the battery to the transmission
Body Service Required	BCM	Used to disable the high voltage system
Brake Boost Data	GWM	Used to determine brake boost data
Brake Pedal Applied	ECM	Brake pedal position used for OBDII freeze frame data
Brake Sensor Status	GWM	Used to determine braking force
Brake Status	GWM	Used to determine brake pedal position
Global clock data	BCM	Global clock used for OBDII freeze frame data
GPS Data	GPS	Used to determine location of vehicle
Secondary Axle Torque Request	SOBDMC	Primary command for the secondary axle
Hybrid Powertrain Status	GWM	Used to determine the hybrid system state
High Voltage Battery	BECM	Used to determine the high voltage battery information
Ignition Status	BCM	Current ignition state; off, accessory, run, start, unknown or invalid
Onboard Charging Status	GWM	Used to determine the onboard charging status
Odometer Master Value	ICM	Vehicle odometer value
Parking Aid Data	GWM	Parking Aid Sensors
PATS Control Command	BCM	Used to determine correct ID for vehicle starting
PATS Control Command	GWM	Used to determine correct ID for vehicle starting
Powertrain Status	ECM	Provides vehicle mode operation to Secondary Inverter System Controller (S-ISC)
Regenerative Braking Information	ABS	Provides date for the regenerative braking system
Restraint impact event status	GWM	Used to disable the high voltage system during a crash
Steering Position Status	ABS	Used to determine the steering position status
Wheel Data	ABS	Used to determine wheel data

Modes of Operation

Secondary Electric Drive

The Secondary Electric Drive system is optional for customers who desire AWD capability and increased performance. The secondary Electric Drive powers the rear wheels, and is not mechanically connected to the Primary Electric Drive system that powers the front wheels. The Secondary ISC (S-ISC) receives its commands from the Primary Drive’s ISC (ISC), and can operate in two basic modes:

• Torque Control Mode – The S-ISC will receive a torque command from the ISC to help propel or brake the vehicle. Regenerative braking is split between the two axles to optimize vehicle efficiency and vehicle stability. Acceleration torque is likewise split between the Front (Primary) and the Rear (Secondary) axles to maximize efficiency, performance, and handling.
• Speed Control Mode – the S-ISC can receive a speed control command from the PCM and ISC in certain wheel slip events to maintain vehicle stability and maximize vehicle handling on slippery road surfaces. The S-ISC in all cases is under the direction and control of the ISC.

The S-ISC follows the ISC for all vehicle powerup and powerdown procedures. It conducts its own safety and functional checks during every system powerup, and assists with HV electrical discharge during every system power-down.

If either the S-ISC or the ISC are faulted, the remaining ISC will be used to drive the vehicle with reduced performance.

TCM Private CAN

Communication between the Secondary ISC (S-ISC) and the ISC happen only over the TCM private CAN bus.

The TCM private CAN reduces the message load on the primary CAN bus. This TCM private CAN also allows for duplication of critical messages from the GSM for safety purposes, so that a single bus failure won’t cause a sudden loss of function of the shifter system.