EXHAUST

Post-processing on thermal and hybrid engines: expertise down the line

The thermal engineering know-how developed by ARIAMIS over the years makes it a privileged contact for manufacturers who want to optimise their vehicle’s thermal performances up to the exhaust phase.

In the face of the environmental stakes targeting the reduction in polluting emissions, manufacturers, engine producers and equipment manufacturers are combining their efforts to propose ever more efficient solutions.  Efficiency can only be achieved by placing thermal engineering at the centre of the thought process. From optimisation in the cylinders up to the muffler, ARIAMIS works on all areas of the exhaust line by sizing its elements based on the existing vehicle architecture.

A permanent lever for progress on which ARIAMIS has been working relentlessly with manufacturers for several years.

In the same way that an engine requires a suitable amount of air, it must not encounter any obstacles to evacuating gases, failing which its component temperatures would rise

THERMAL CONSTRAINT MANAGEMENT FOR ALL EXHAUST COMPONENTS

Directly interacting with the rest of the engine, the exhaust is a system that requires an ideal operating temperature. ARIAMIS is capable of acting from the combustion phase by compensating the lack of temperature consistency in the chamber by implementing exhaust gas circulation systems at the collector level to obtain optimum combustion. The search for thermal optimisation obviously continues in the post-processing phase. Too high temperatures risk damaging the catalytic converter, whereas too low temperatures can lead to a “light off” phenomenon.   Calculating the correct sizing of the hot zone elements (engine output, FAP, catalytic converter, etc.) as well as of the cold zone (muffler) therefore remains a crucial theme that ARIAMIS considers very early in the thought process.  Similarly to different types of combustion engine, petrol, diesel or natural gas molecules do not have the same combustion properties.

WHEN THERMAL ENGINEERING PARTICIPATES IN THE ACOUSTIC STAKES

Manufacturers regularly consult ARIAMIS to support them in managing an issue that is increasingly linked to exhaust: noise. In addition to its project management mission with manufacturer teams, ARIAMIS carries out technical work on the noise optimisation of rear mufflers. To anticipate the 2024 standard and its maximum 68 dB, car manufacturers now consult ARIAMIS to correctly size this key element. The muffler volume, the addition of parts to reduce the noise without increasing constraints on the propulsion unit and its thermal profile... ARIAMIS uses its simulation tools and its engineers’ experience to meet this new requirement which is once again very closely related to thermal engineering issues.