Evaluate Battery Charge Level, Basic Function - GF54.10-P-1000A
Model All (4xWD)
Model All (CAR)
Overview
This document contains information on:
- General
- Function
- 12 V on-board electrical system battery
- ECO start/stop auxiliary battery (hybrid vehicles with backup concept)
- Secondary 12 V on-board electrical system battery (vehicles for conditionally automated parking or driving)
- 48 V battery (vehicles with 48 V technology)
- High-voltage battery (hybrid vehicles, electric vehicles)
General
The energy management evaluates the battery charge level. It uses this as a basis to actuate various functions to guarantee vehicle mobility and a stable supply to all electrical consumers.
Function
The charge level of the battery is the ratio of the current charge to the maximum storable charge.
The energy management calculates the battery charge level based on the following values:
- Battery voltage
- Current flow from and to the battery
- Battery temperature
- Internal resistance of battery
- Battery capacity
If the charge level is too low, the battery must be charged.
12 V on-board electrical system battery
In conventional vehicles with wet or fleece batteries, the parameters that describe the charge level of the 12 V on-board electrical system battery are recorded by the battery sensor at the negative pole of the 12 V on-board electrical system battery.
On vehicles equipped with a lithium-ion battery an electronic system is integrated into the 12 V on-board electrical system battery.
Vehicles with a 24 V on-board electrical system have two additional 12 V on-board electrical system batteries connected in series. These do not have a battery sensor.
ECO start/stop auxiliary battery (hybrid vehicles with backup concept)
The energy management evaluates the charge level of the additional battery for ECO start/stop immediately after the engine is started. The additional battery for ECO start/stop is briefly loaded. The resultant voltage drop is used by the energy management to calculate the internal resistance of the auxiliary battery for ECO start/stop. If the combustion engine is switched off during this evaluation run, the result is then discarded. When the ECO start/stop function is active, the energy management detects the voltage of the additional battery ECO start/stop each time the engine is started.
The assessment of the charge level for the additional battery for ECO start/stop can also be started using the diagnostic tester.
Secondary 12 V on-board electrical system battery (vehicles for conditionally automated parking or driving)
The parameters that describe the battery's state of charge are recorded by the battery sensor at the negative pole of the battery.
48 V battery (vehicles with 48 V technology)
An electronics system is integrated into the 48 V battery that continually records information about the battery's condition and sends it to the 48 V on-board electrical system's energy management system.
The 48 V battery is heated at low temperatures via the low-temperature circuit and cooled at high temperatures. This ensures a long service life and an optimum storage capacity for the 48 V battery.
High-voltage battery (hybrid vehicles, electric vehicles)
The charge level of the high-voltage battery is monitored by the battery management system.
The high-voltage battery is heated at low temperatures at cooled at high temperatures. This extends the service life and ensures an optimum storage capacity of the high-voltage battery.
| Function schematics | |||
| Evaluate high-voltage battery charge level, function schematic | Model 167, 213 as of model year 2021 with hybrid drive Model 118, 177, 247 up to model year 2023 with hybrid drive Model 118, 177, 247 as of model year 2023, 206, 214, 223, 236, 254, 290 with hybrid vehicle Model 243, 293, 294, 295, 296, 297 | PE47.70-P-2500-97A | |
| Model 192, 232 with engine 177 with code ME10 (Hybrid vehicle (plug-in, PHEV)) | PE47.70-P-2500-97B | ||
| Evaluate state of charge of 12 V battery, function schematic | Model 118, 167, 177, 243, 247, 293 Model 213, 238, 257, 290 as of model year 2021 | PE54.10-P-2516-97A | |
| Model 192, 206, 214, 223, 232, 236, 254, 294, 295, 296, 297, 464 | PE54.10-P-2516-97C | ||
| Evaluate state of charge of 48 V battery, function schematic | Model 167, 213, 238, 257, 290 with code B01 (48V technology) | PE54.10-P-2517-97A | |
| Model 192, 206, 214, 223, 232, 236, 254 with code B01 (48V technology) | PE54.10-P-2517-97C | ||
| Model 118, 177, 247 with code B01 (48V technology) | PE54.10-P-2517-97D | ||
| Additional basic functions | |||
| Battery management system control unit basic function | All models (cars) with xEV charging socket | GF47.70-P-9895A | |
| Electric vehicle high-voltage on-board electrical system DC/DC converter control unit basic function | Model all (CAR) | GF54.10-P-9895A | |
| Hybrid vehicle high-voltage on-board electrical system DC/DC converter control unit basic function | Model all (CAR) | GF54.10-P-9897A | |
| 48 V on-board electrical system DC/DC converter control unit basic function | Model all (CAR) with code B01 (48V technology) | GF54.10-P-9898A | |
| Basic function of signal acquisition and actuation module | Model 118, 177, 243, 247, 464 | GF54.21-P-9895A | |
| Basic function of signal acquisition and actuation module at front | Model 167, 192, 206, 214, 223, 232, 236, 254, 293, 294, 295, 296, 297 Model 213, 238, 257, 290 as of model year 2021 | GF54.21-P-9896A | |
| Basic function of signal acquisition and actuation module at rear | Model 167, 192, 206, 214, 223, 232, 236, 254, 293, 294, 295, 296, 297 Model 213, 238, 257, 290 as of model year 2021 | GF54.21-P-9897A | |
| Electronic ignition lock control unit, basic function | GF80.57-P-9890A | ||
| High-voltage battery, basic function | Electric vehicles | GF47.70-P-2000A | |
| Battery sensor, basic function | GF54.10-P-2009A | ||
| On-board electrical system battery, basic function | GF54.10-P-2011A | ||
| 48 V on-board electrical system battery, basic function | Model all (CAR) with code B01 (48V technology) | GF54.10-P-2016A | |
| Secondary 12 V on-board electrical system battery, basic function | Model all (CAR) | GF54.10-P-2020A | |
| Secondary 12 V on-board electrical system DC/DC converter control unit, basic function | Model all (CAR) | GF54.10-P-2019A |