Stored Data Of Driving Cycle - Details - SN00.01-P-0008-09A

Model all (CAR) 

STAR2 and STAR3 

Charge balance of driving cycle 

• For trips > 5 min, the charge balance should be positive (> 0 Ah).
• The value < 0 Ah for trips > 5 min generally only occurs in the case of a particularly high state of charge (SOC).
• A high negative charge balance (of > 20 Ah) can point to critical operating conditions or a fault of the vehicle.

Courtesy of MERCEDES-BENZ USA

Internal resistance and state of charge 

• The value of the internal resistance (Ri) of a battery depends on the state of charge of the battery, design of the battery, battery temperature/outside temperature and poss. connected loads.
• The SOC is the currently still available battery capacity in percent.
• Ri must thus always be evaluated in combination with the SOC.
• Value range for SOC:
  • Normal range: 65-100%
  • Partially charged range: 45-65%
  • Poor range: < 45%

Courtesy of MERCEDES-BENZ USA

Battery temperature 

• The possibilities regarding energy absorption and energy release depends on the battery temperature.
• The following influence the battery temperature:
  • The outside temperatures and
  • The installation location of the battery in the vehicle.

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Stored data 

• Resistance of ground strap/electric circuit:  The resistances of the ground strap and the electric circuit depend on several variables and are of little significance on their own.
• Minimum battery voltage:  The minimum battery voltage is shown by circuit 30, and describes the minimum achieved voltage for a stationary phase during a driving cycle.
• Minimum consumer voltage:  The minimum consumer voltage functions similar to the battery voltage, however related to the consumers and not the battery itself.
• Maximum engine load/frequency counter:  Maximum engine load and frequency counter are only active if the ECO start/stop function is used during the trip.

Function of alternator management 

• For battery temperatures > 10°C and an outside temperature > 0°C, the on-board electrical system establishes a state of charge of approx. 80% (SoC) during the trip.
• In the case of fully charged batteries, the active alternator management can lead to a limited discharging, as the battery is deliberately not charged for a defined period.
• Alternator management is deactivated for SoC values < 75%, on-board electrical system problems, trailer operation or similar.
• Alternator management ACTIVE is a value that is only recorded in non-electric vehicles, and records the activity of the alternator management.
• Alternator management AVAILABLE only records the availability, and is also only recorded for non-electric vehicles.

Non-electric means: Plug-in hybrid depending on the modification year.

48 V: Start-stop regulated, constant charging will take place as of model year 2025.

Function of battery disconnect switch (BTS) 

• The actions of the battery disconnect switch (BTS) are shown in the on-board electrical system diagnosis with the values circuit 30 and 30T.
• The 4 statuses of the battery disconnect switch are:
  • Pre-Reset
  • reset
  • Pre-Open
  • Open
• The two "pre-values" take place, in each case, 5 min before "Reset"/"Open", a network message that announces the "Reset"/"Open" is sent to all control units.
• The status "battery disconnect switch open" ensures the startability.
• The battery disconnect switch is operated depending on the SOC: Open is initiated at 40% SOC.
• The "Open" at 40% can only be skipped if an active customer request exists, e.g. circuit 15/15R is deliberately activated.
• If a "Reset" is carried out at a SOC > 40%, the malfunction of a control unit should in general be reset.