The Elastic Turbocharger

Theoretical Concept for Recovering Automotive Suspension Elastic Potential Energy to Assist eTurbo Operation

Abstract

Introduction: Conventional vehicle energy recovery systems typically focus on regenerative braking or exhaust gas utilisation, neglecting other potential sources. The elastic energy temporarily stored in suspension springs during vehicle motion is usually dissipated by dampers. Objective: This study proposes and theoretically analyses the concept of the Elastic Turbo, an energy recovery system based on suspension spring compression, aiming to power an electric turbocharger (eTurbo). Methodology: The theoretical framework is based on Hooke’s Law and the principle of energy conservation. Arbitrary yet physically consistent parameters are adopted to estimate the elastic potential energy generated per spring compression and its conversion into electrical power using a permanent magnet synchronous motor (PMSM). Results: Calculations indicate that a single compression event can provide up to 22.5 J of recoverable energy, equivalent to an instantaneous power output of 225 W and a torque of 2.5 N·m at an angular velocity of 150 rad/s. Conclusion: The system demonstrates theoretical feasibility and potential applicability in hybrid or high-performance vehicles, provided it is properly integrated into the rear suspension and coupled with an efficient mechanical-to-electrical conversion interface.