Emisja C02 myślę że jest głównym powodem.
NIe sądzę, to byłoby zbyt niemądre - jednak wysoka kultura techniczna "Made in Japan" zobowiązuje.
Claude jest zdania, że:
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IBS and Overcharge Prevention
In the C-HR II 2.0 hybrid, the 12V battery is charged not by a traditional alternator, but by a DC/DC converter that steps down voltage from the high-voltage hybrid battery. This converter is software-controlled — and it relies on the IBS data to regulate charging correctly.
Without accurate IBS feedback, the DC/DC converter could:
Overcharge the battery → causing excess heat, electrolyte loss, and shortened battery life
Undercharge the battery → leading to the flat battery problem common in C-HR hybrids
So the IBS tells the hybrid ECU:
"Battery is full → stop or reduce charging"
"Battery is low → increase charging output"
"Battery is aging → adjust charging curve" (SoH function)
Why Overcharge is Especially Risky in a Hybrid
In a conventional car, overcharging is limited naturally because the alternator output drops as battery voltage rises. But in a hybrid with a DC/DC converter, charging can be more aggressive and sustained — so active monitoring via IBS is essential to prevent dumping too much energy into the 12V battery.
The Physics Behind It
Inside the alternator:
The rotor is an electromagnet — its strength depends on how much current flows through it
The voltage regulator acts like a feedback loop: it compares actual output voltage to its target setpoint
When output voltage reaches the target → regulator cuts field current → less magnetism → less electricity generated
This is essentially automatic closed-loop voltage regulation — the alternator is always hunting for that ~14.4V target, backing off when the battery is satisfied.
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Zatem raczej wymagania technologiczne - gdybyś miał zwykły alternator z kopciuchem na dizlu, to byś nie miał IBS'a (bo po co podrażać?).
Ale że masz hybrydę i DC/DC to aby zapobiec błyskawicznej degradacji aku 12V w gorące letnie dni potrzeba coś z tym zrobić.
Oczywiście można by dać alternator i temat ogarnąć bez IBS'a ale wtedy po co nam hybryda, dajmy jeszcze tarcze w skrzyni biegów manualną skrzynię i dizelka z depeefem

BTW myślę że magia IBS rozwiązana - konwerter DC/DC może przeładować pełen akumulator, bo będzie nieustannie ładował nie zważając na stan naładowania akumulatora. Alternator nie, bo ma ograniczenia natury fizycznej
