gf0830p9900a

Hybrid system, basic function

Type gf · topic 08.30 · version 0102 · 2020-06-20

Applies to: Model all (CAR) with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in)) Model all (CAR) with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))

Where it sits

Function group 1 Engine › 08 Electric drive, hybrid drive › 08.30 Hybrid drive system — Series 900 (models 9**) · Series 902 (models 9**) · Series 904 (models 918, 919, 924, 925, 938, 943, 957) · Series 906 (models 917, 918, 924, 953)

EinPAS 15 Engine › 15.50 Electric drive/hybrid drive › 15.50.1 Basic information — Series 900 (models 9**) · Series 902 (models 9**) · Series 904 (models 918, 919, 924, 925, 938, 943, 957) · Series 906 (models 917, 918, 924, 953)

Also applies to engines/gearboxes: 139 ***, 254 ***, 256 ***, 272 ***, 276 ***, 282 ***, 457 9**, 541 9**, 542 9**, 608 ***, 700 4**, 700 420, 700 421, 700 422, 700 423, 715 3**, 715 5**, 722 6**, 722 9**, 724 ***, 724 0**, 724 033, 724 044, 724 045, 724 1**, 724 103, 724 114, 724 115, 724 120, 725 ***, 725 0**, 725 035, 725 037, 725 038, 725 085, 725 1**, 739 390, 739 391, 739 395, 739 396, 739 397, 739 398, 739 399, 740 698, 743 3**, 743 4**, 743 498, 746 971, 924 9**, 924 910, 925 9**, 926 9**

GF08.30-P-9900A

Hybrid system, basic function

17.06.2020

Model

all (CAR)

with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in))

Model

all (CAR)

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

The general operating principle of the hybrid system is explained in the following.

General

To generate the drive torque, one of the following is used:

Only the combustion engine (conventional operating status),

Only the electric machine (electric mode)

The electric machine in combination with the combustion engine (hybrid mode).

In hybrid mode, the electric machine and combustion engine work together on the powertrain, which aggregates the torques of the individual drives.

The electric machine generates either an engine-generated torque or works as an alternator in recuperation.

The control of the hybrid system comprises the control of the combustion engines and the control of the power electronics control unit with the electric machine. The master control unit is thus the powertrain control unit, which contains the aggregate coordinator and thus coordinates all torques in the hybrid system. The top objective of the control is the lowest possible fuel consumption.

The energy management also takes place through the powertrain control unit.

The powertrain control unit determines the required output of the electric drive from the relevant vehicle data and requests this from the power electronics control unit. The power electronics control unit actuates the electric machine with 3-phase alternating voltage over the integrated power inverter and monitors the electric machine concerning its temperature and generated drive torque. The electric machine transfers the drive torque directly to the drive shaft.

The electric machine correlates the required energy during engine operation via the high-voltage on-board electrical system of the high-voltage battery. Charging of the high-voltage battery takes place while driving in overrun mode, when the electric machine works as an alternator. For plug-in hybrids, stationary charging is also possible by connecting an external power source.

To protect the electric drive from overheating, the power electronics control unit is cooled.

The driver receives information about the energy flow in the drivetrain and information about the charge level of the high-voltage battery via the multifunction display.

We will not go into further detail here about internal function sequences of the combustion engine, automatic transmission, regenerative brake system, 12 V on-board electrical system, and the high-voltage on-board electrical system.

During recuperative braking, the total braking torque requested by the driver is divided into one part of the braking torque to be implemented by the electric machine (recuperative) and one to be implemented by the service brake.

Subsystems

Driving mode, basic function

Model 167
with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in))
Model 177, 247
with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))
Model 213
as of model year 2021
with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in))
Model 213
as of model year 2021
with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))

GF08.00-P-1003B

Overrun mode, basic function

Model 167
with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in))
Model 177, 247
with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))
Model 213
as of model year 2021
with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in))
Model 213
as of model year 2021
with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))

GF08.00-P-1004B

Hybrid system energy flow, basic function

GF08.30-P-1006A

Hybrid system state of charge display, basic function

GF08.30-P-1007A

Hybrid system activation, basic function

GF08.30-P-1008A

Hybrid system deactivation, basic function

GF08.30-P-1009A

Hybrid system monitoring, basic function

GF08.30-P-1014A

Charge battery while driving, basic function

GF54.10-P-1002A

Stationary battery charging, basic function

GF54.10-P-1006A

High-voltage on-board electrical system, basic function

GF54.10-P-1016A

Referenced documents