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Benefit of air intake optimization for new turbocharged gasoline engine

Abstract : The last years have witnessed a strong increase of the sold spark ignition engines. Furthermore the new regulations are formally constraining pollutant emissions and CO2 with high fines. In the same time the new homologation driving cycle extends the engine operating conditions where the emissions need to be controlled. The downsizing has been a strong lever over the last years to improve the fuel consumption with reduction of the throttling and thus the pumping losses. With the downsizing, the turbocharger has been widely adopted to maintain the output performance. The implementation of turbocharger challenges the time to torque and the low end torque at low engine speed. In the same time the increase of boost pressure associated to high compression ratio confront the knock controls at maximum power operating conditions. This thesis focuses on acoustic boosting with volumetric efficiency enhancement to improve the low end torque and the time to torque. Firstly a simulation model allows taking into account the combustion behavior as well as the turbocharger characteristics. The intake geometry has been optimized to enhance the engine response time and low end torque. The second part deals with the pressure wave action used to reduce the intake temperature and thus improve the knock resistance being beneficial for exhaust gas temperature reduction. The interaction between the waves created the different cylinder is demonstrated. The test has confirmed the power increase while maintaining lambda 1 and thus keeping the three way catalyst efficient.
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Contributor : David Chalet <>
Submitted on : Wednesday, January 29, 2020 - 5:59:19 PM
Last modification on : Tuesday, February 11, 2020 - 2:15:12 PM


2019 Thèse Raimbault.pdf
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Vincent Raimbault. Benefit of air intake optimization for new turbocharged gasoline engine. Engineering Sciences [physics]. Ecole Centrale de Nantes (ECN), 2019. English. ⟨tel-02460029⟩



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