Component Description For Power Electronics Control Unit - GF08.20-P-1001RFH
Engine 274.920 in model 205.047/147/247, 253.954
Engine 274.920 in model 205.053/253
Engine 274.920 in model 253.354
Engine 651.921 in model 205.012/212
Engine 654.920 in model 205.013/213
Shown on model 205.012
Shown on model 205.047
Shown on model 253.954
Location
The power electronics control unit is located in the right side of the engine compartment at the rear (model 205.012/212/047/147/247).
The power electronics control unit is located on the left next to the fuel tank (model 253.354/954, 205.013/213/053/253).
Shown on power electronics control unit (model 205.047/147/247)
Shown on power electronics control unit (model 205.047/147/247)
Shown on power electronics control unit (model 253)
Structure
In the power electronics control unit there is the power inverter to actuate the electrical machine.
A DC/DC converter is integrated in the power electronics control unit for supplying the 12 V on-board electrical system. (Except model 253)
DC/DC converter
A DC/DC converter is integrated in the power electronics control unit, which converts the high voltage direct voltage (primary voltage) into 12 V direct voltage (secondary voltage) and vice versa and transfers these between the high voltage on-board electrical system and the 12 V on-board electrical system.
DC/DC converter control unit (N83/1)
The DC/DC converter control unit is installed in the vehicle as a separate component. The DC/DC converter control converts high-voltage direct voltage (primary voltage) into 12-V direct voltage (secondary voltage) and transfers these between the high voltage on-board electrical system and the 12-V on-board electrical system.
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.
In order to do this, a 12 V/88 Hz interlock signal is looped through all assembly parts of the high voltage on-board electrical system that can be removed or opened. To do this there is an electrical bridge in each removable high-voltage connection which interrupts the interlock circuit during removal of the high-voltage connection. The interlock circuit is also led switched in a series over the 12 V control units plug connection of the high-voltage components.
Tasks
General
The power electronics control unit actuates the electrical machine by request from the CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) using a 3-phase AC voltage. It monitors the temperature and position of the electrical machine and provides diagnoses and forecasts regarding the available torque to the CDI control unit or the ME-SFI [ME] control unit.
Coding
The power electronics control unit is flashable which means that the complete software in the control unit can be updated.
CAN network
The power electronics control unit is connected via the HYBRID CAN (CAN L) to the CAN network of the vehicle and exchanges data with other control units.
Input and output signals
- Direct input/output signals
- Output connections over a high voltage distributor plate
- CAN input/output signals
Input factors and initial parameters for the following components are read in or output over direct lines by the power electronics control unit and are needed by the engine timing:
The DC/DC converter is integrated in the power electronics control unit which produces a high voltage direct voltage and a 12 V direct voltage. The DC/DC converter enables energy exchange between the high voltage on-board electrical system and the 12 V on-board electrical system when it transforms high voltage direct voltage (primary voltage) into 12 V direct voltage (secondary voltage) and vice versa. As a result equalization of battery energies between the on-board electrical systems and a starting assistance function is made possible at an external voltage of 14 V.
| Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
|---|---|---|
| Circuit 30c (crash signal from the pyrofuse (F63)) | - | - |
| Chassis 30 | - | - |
| Circuit 31 | - | - |
| Circuit 50 (shut down) from CDI control unit or ME-SFI [ME] control unit | - | CDI control unit except model 205.047/147/247, 253 |
| Circuit 87f | - | - |
| Engine speed signal (internal combustion engine) | - | TNA |
| Interlock circuit | Interlock circuit | - |
| Electrical machine rotor position sensor (L20) | Power supply for electrical machine rotor position sensor (L20) | - |
| Electrical machine temperature sensor (A79/1b1) | Electrical machine temperature sensor power supply (A79/1b1) | - |
The following components are connected over output connections with the power electronics control unit:
| Output connections + | Output connections - | Supplemental information |
|---|---|---|
| High-voltage battery (A100g1) (discharge current) | High-voltage battery (A100g1) (discharge current) | - |
| High-voltage battery (A100g1) (charging current) | High-voltage battery (A100g1) (charging current) | - |
| - | Phase U (actuation for engine operation mode, charging current from alternator operation mode) Electrical machine (A79/1) | - |
| - | Phase U (actuation for engine operation mode, charging current from alternator operation mode) Electrical machine (A79/1) | - |
| - | Phase W (actuation for engine operation mode, charging current from alternator operation mode) Electrical machine (A79/1) | - |
| High-voltage connection for battery management system control unit (N82/2) | High-voltage connection for battery management system control unit (N82/2) | - |
| High voltage positive temperature coefficient heater high-voltage connection (N33/5) | High voltage positive temperature coefficient heater high-voltage connection (N33/5) | Model 205.047/147/247 |
| Electrical A/C compressor high-voltage connection (A9/5) | Electrical A/C compressor high-voltage connection (A9/5) | Model 205.012/212/047/147/247 |
| High-voltage connection for high voltage power distributor (X999/) | High-voltage connection for high voltage power distributor (X999/) | Model 253.354/954 |
Input factors and initial parameters for the following components and control units are sent or received by the power electronics control unit via the CAN:
| Input factors via hybrid CAN (CAN L) | Starting data via hybrid CAN (CAN L) | Supplemental information |
|---|---|---|
| Battery management system control unit (N82/2) | Battery management system control unit (N82/2) | - |
| Charger (N83/5) | Charger (N83/5) | Model 205.047/147/247 |
| DC/DC converter control unit (N83/1) | DC/DC converter control unit (N83/1) | Model 253.354/954 |
| Powertrain control unit (N127) | Powertrain control unit (N127) | Contained signals of further control units which are connected via the CAN network. |
| Wiring diagram for the power electronics control unit | Engine 274.920 in model 253.354 Engine 274.920 in model 253.954 | PE54.10-P-2106-97FBB | |
| Engine 274.920 in model 205.047/147/247 Engine 651.921 in model 205.012/212 | PE54.10-P-2106-97FBA |