Given the interest generated by the IBS sensor, we provide more details on its strategies and operation below.

With the massive advent of the S&S (Stop&Start)The modern battery had to take precautions to prevent and monitor its proper functioning by introducing a monitoring system: the sensor IBS (Intelligent Battery Sensor), system that can be adopted on European standard batteries.

Below we describe the system adopted by FCA, which can largely be likened to the other brands.

The IBS sensor has the function of monitoring the general state of the battery, communicating it to the vehicle (in particular to the Body Computer Node) to enable optimal management within the framework of S&S strategies, and informing the driver if the battery needs to be replaced.

The sensor is located on the negative pole of the battery, which is replaced by a quick-disconnect clamp that connects directly to the engine/gearbox ground point.

The IBS performs the following measures:

- Battery voltage (V);
- Battery current (A);
- Battery temperature (°C).

These measurements are processed by the IBS, which calculates parameters that express the state of the battery:
- SOH = Battery health status: is an indication of battery ageing. It indicates, in %, the actual capacity of the battery compared to its nominal capacity. The diction is due to the fact that, during operation, the battery is subject to irreversible processes that reduce its ability to be recharged and to supply energy (battery ageing).

- SOC = Battery charge status: represents, in %, the remaining battery charge compared to its nominal capacity. It basically indicates how full the battery is. Periodically, the IBS collects the following information on the battery status:

- SOF = Battery function state: represents, in V, the prediction of the minimum peak voltage that will be reached during the next engine start.

The IBS strategy also saves some fuel because it recharges the battery with the alternator only when necessary and under the most favourable conditions, for example during braking and slowing down of the car.

For these reasons, when reconnecting after a battery disconnection, the IBS sensor requires RECALIBRATION.

IBS sensor recalibration

When the IBS is powered for the first time, or is powered after a power failure, it enters a phase known as 'recalibration'; during this phase, the battery type and state are learnt; at this time, the S&S system is NOT available so the engine  It does NOT shut down and restart as usual.

In the recalibration phase, the tolerances on the state variables (SOC, SOF, SOH) are higher than under normal operating conditions. The IBS exits the calibration phase when the SOC and SOF ratings are within tolerances: This occurs after a resting phase (engine off) of at least 4 hours followed by starting.

Disabling can take place as a safeguard, even during normal operation in the event of temporary problems.

And it is important to know this so that a normal 'modus operandi' cannot be confused with an anomaly.

As mentioned, the IBS is installed directly on the negative pole and is compatible with all European standard batteries.

1. Engine/gearbox ground cable
2. Negative quick-release clamp
3. Connection between terminal and battery status sensor
4. Negative battery pole
5. Battery status sensor

With this solution, each current draw on the negative pole is detected by the sensor, so that a correct estimate of the battery status is obtained.

Maintenance details

IBS sensor pin out

 

 

 

1- LIN communication line
2- +30 feed from F90 engine compartment junction box

Emergency start-up

In the case of emergency starting with an auxiliary battery, never connect the negative (-) cable of the auxiliary battery to the negative pole of the vehicle battery, but rather to an engine/gearbox ground point.

For cars equipped with a supplementary heater (PTC), fasten the positive (+) cable to the stud (1) and NOT to one of the studs (2) to which fuses are connected

Battery charging

To recharge the battery, proceed as indicated:

- disconnect the terminal A (via action on the red button) from the IBS sensor;

- connect the positive cable of the charging unit to the positive battery terminal and the negative cable to the negative battery terminal. B;

ATTENTION : on vehicles equipped with a supplementary heater (PTC), the positive cable must be fixed on the stud (1) e NOT to one of the prisoners (2) to which fuses are connected.

- switch on the charging unit. When charging is complete, switch off the device before disconnecting it;

- after disconnecting the charging device, reconnect the quick-release clamp A.

May technology be with you, good work... 

 

Attachments:

• battery charging
• IBS pinout
• emergency recharge