DBM20A V2.9 software for smart alternators of Euro 6d-Temp vehicles

In the past, the alternator charged the starter battery as soon as the engine was running. Classic dual battery systems such as the IBS-DBS or IBS-DBR, also known as VSR, Voltage Sensing Relay, charge the auxiliary battery easily and reliably during this time.
Voltage-reducing alternators have been installed for several years, which charge normally when the vehicle is started and reduce the charging voltage to around 13.3V over the travel time. Among other things, this prevents the battery from being fully charged after a short time. When charging additional batteries that are heavily discharged, this can lead to them no longer being fully charged. In some vehicles, a diode can be connected in series to the alternator fuse, which increases the charging voltage by 0.6V in classic battery systems and guarantees a full starter and auxiliary battery again.
In recent years with various exhaust gas scandals, the vehicle industry has started to use smart alternators, which still charge mostly in overrun mode (downhill, gear change, braking and sometimes shortly after the vehicle starts) and thus allegedly reduce exhaust emissions. A DC / DC charging booster is used here, which continuously ensures a good constant charge on the auxiliary battery.
The new IBS-DBM20A with software V2.9 and additionally installed LinkStartKit or IBS-DBS dual battery system activates the dynamic Smart Alternator detection. The measurement of various latest vehicles has shown that some smart alternators can switch between classic, voltage-reduced and smart alternator charging. The IBS system monitors the alternator and changes from classic to smart charging and shortens the charging time if possible. A classic charging booster can only charge up to its maximum charging capacity. The IBS-DBM20A with installed relay charges with the relay during the classic charging time, whereby the full charging capacity of the alternator brings the additional battery to approx. 80% charge in a short time and that Charging booster with the 3 to 4 step charging process (bulk, absorption, equalize, float) the battery is still charging. On long journeys, the DBM20A changes to float at the end of charging so as not to overcharge the battery. In combination with lithium batteries, the start current limit of approx. 0.2C is used, which prevents excessive charging currents.