Power Electronics Control Unit, Basic Function - GF08.20-P-9891A

Model all (CAR) with code ME01 (Electric motor) 

Model all (CAR) with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUGIN)) 

Model all (CAR) with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN)) 

Overview 

This document contains information on:

• General 
• Function requirements 
• Function 

General 

The power electronics control unit controls the electric machine. It is connected to the vehicle's network architecture.

In vehicles with two electric machines, there is one power electronics control unit for each machine.

Function requirements 

• Circuit 30t ON

Function 

The power electronics control unit consists of a power unit and a logic section. The power unit is a power inverter, which connect a 3-phase alternating voltage on the side of the electric machine to a direct voltage on the side of the high-voltage on-board electrical system. The power inverter facilitates an energy transfer in both directions. Depending on the direction of the energy transfer, the electric machine is operated either as an engine or as a generator.

The logic section is responsible for communication with other control units and for actuation of the power inverter. Activating the power-electronics elements changes the logic section amount and direction of the energy transfer in the power inverter.

The power electronics control unit monitors the temperature and engine RPM of the electric machine and provides diagnoses and forecasts on the available torque in the CAN compound.

Interlock circuit 

The interlock circuit is used as contact protection to protect people against inadvertent contact with high-voltage components. The interlock is an anticipatory contact which opens a little before the high-voltage connection when opening a high-voltage connection. In this way timely discharging of the high voltage intermediate circuit is achieved by the control units of the high-voltage components.

The following applies for hybrid vehicles: 

The power electronics control unit contains a DC/DC converter that facilitates an energy exchange between the high-voltage on-board electrical system and the 12 V on-board electrical system.

The power electronics control unit processes the following items of information:

• Circuit status
• Specified value for torque of electric machine
• Torque limitation of electric machine
• Direction of rotation of electric machine
• Drive train operational

The power electronics control unit processes these input factors and sends, among others, the following information:

• Actual torque of electric machine
• Actual engine speed of electric machine
• Available torque from electric machine
• Status of electric machine

	Detailed information
	Detailed information on power electronics control unit	Model 293 with code ME01 (Electric motor)	GF08.20-P-0000A
		Model 167 with code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUGIN))	GF08.20-P-0000B
		Model 177, 247 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))	GF08.20-P-0000C