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Mild Hybrid Cars Explained: How MHEV Technology Works

  • تاريخ النشر: الخميس، 17 أبريل 2025 زمن القراءة: دقيقة قراءة
Mild Hybrid Cars Explained: How MHEV Technology Works

As the automotive industry shifts toward electrification, mild hybrid electric vehicles (MHEVs) have emerged as a cost-effective middle ground between traditional combustion engines and full hybrids. But what exactly is a mild hybrid, and how does its technology work?

Understanding Mild Hybrid (MHEV) Technology

A mild hybrid car combines a conventional internal combustion engine (ICE) with a small electric motor and a 48-volt battery system. Unlike full hybrids (HEVs) or plug-in hybrids (PHEVs), mild hybrids cannot drive on electric power alone. Instead, the electric motor assists the engine to improve fuel efficiency and reduce emissions.

Key Components of a Mild Hybrid System:

  1. 48-Volt Battery – Replaces the traditional 12-volt system, providing extra power for the electric motor.
  2. Belt-Driven Starter-Generator (BSG) or Integrated Starter-Generator (ISG) – Acts as both a motor (assisting the engine) and a generator (recovering energy during braking).
  3. Power Electronics – Manages energy flow between the battery, motor, and engine.

How Does MHEV Technology Work?

  1. Engine Assistance – The electric motor provides torque during acceleration, reducing the engine’s workload and improving efficiency.
  2. Start-Stop Function – The system shuts off the engine at stops and restarts it seamlessly, saving fuel.
  3. Regenerative Braking – Captures kinetic energy during deceleration, converting it into electricity to recharge the battery.
  4. Coasting & Sailing – Some MHEVs can deactivate the engine while cruising, relying on momentum to save fuel.

Advantages of Mild Hybrid Cars

  • Better Fuel Economy (up to 15% improvement over non-hybrids)
  • Lower Emissions (helps meet stricter regulations)
  • Cost-Effective – Cheaper than full hybrids or EVs

  • Smoother Driving Experience – Enhanced stop-start and acceleration

Limitations of MHEVs

  • No Electric-Only Driving – Unlike full hybrids, MHEVs always rely on the engine.
  • Modest Efficiency Gains – Less impactful than plug-in or full hybrids.
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