A Review of the Overall Efficiency of Automotive Energy Recovery Systems in Extending Travel Range

Due to the environmental concerns associated with conventional fuel vehicles, improving overall vehicle efficiency has become a key research priority. This paper investigates whether automotive energy recovery systems can effectively enhance efficiency and extend travel distance using the same input energy. Multiple recovery methodsincluding regenerative braking, mechanical flywheels, thermoelectric generators, Rankine cycle systems, and electric turbochargersare assessed based on their overall efficiency. These systems aim to recollect and utilize waste energy to improve performance. Among hybrid vehicles, energy recovery remains the most critical factor for efficiency gains. Test results indicate that each method offers measurable benefits, such as reduced battery stress, improved acceleration, and extended range. Mechanical flywheels emerged as the most feasible solution, closely followed by regenerative braking. While all systems show potential, future studies must focus on optimizing control strategies and validating effectiveness under real-world, transient conditions to ensure consistent and scalable improvements in automotive efficiency.