(Electric Drive Powertrain Control Unit, Basic Function - GF08.20-P-9892A)

Electric vehicles 

Example illustration of powertrain control unit 

Courtesy of MERCEDES-BENZ USA

Overview 

This document contains information on:

• General 
• Function requirements 
• Function 

General 

The electric drive powertrain control unit (1) is the central control unit for all functions of the drivetrain. It is connected to the vehicle's network architecture.

Function requirements 

• Circuit 30t ON

Function 

The tasks of the powertrain control unit (1) include:

• Traction management
• Energy management
• Heat management in the drivetrain
  • Electric drive low-temperature circuit
  • High-voltage battery low-temperature circuit
• High- and low-voltage coordination
• Interface (gateway) between the connected bus systems

The powertrain control unit (1) processes the following information, for example:

• Circuit status
• High-voltage battery voltage/current
• High-voltage battery charge level
• Temperature of high-voltage battery
• DC/DC converter temperature
• Temperature of alternating current charger for high-voltage battery

For vehicles with two electric machines, the corresponding information is processed and sent for each machine.

The powertrain control unit (1) processes these input factors and transmits the following information, for example:

• Specified value for torque of electric machine
• Torque limitation of electric machine
• Direction of rotation of electric machine
• Drive train operational
• Transmission mode
• Max. charge/discharge current
• Contactor status
• Status of alternating current charger for high-voltage battery
• Actual torque of electric machine
• Actual engine speed of electric machine
• Available torque from electrical machine
• Status of electric machine
• Fan motor status
• Accelerator pedal sensor
• Start/stop button
• Status of the DYNAMIC SELECT switch
• Status of steering wheel gearshift buttons

	Component descriptions
	Drivetrain control unit, component description	Model 243	GF54.21-P-2141B
		Model 295	GF54.21-P-2141E
		Model 297	GF54.21-P-2141D
		Model 296	GF54.21-P-2141G
		Model 294	GF54.21-P-2141N