Improvement of transient response with charge air sub-cooling: an integrative approach

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Improvement of transient response with charge air sub-cooling: an integrative approach

Wieske, Peter / Dingelstadt, Rene / Warth, Marco / Stehlig, Jürgen / Eilemann, Andreas / Tremble, Paul

Downsizing in combination with turbocharging is an effective measure to improve fuel economy. Particularly at low engine speeds, however, the transient response generally decreases with the reduced engine displacement and numerous technologies are in series production (or development) to improve the driveability. An additional or alternative measure to improve transient response might be to use a thermal compressor. Here, the charge air cooling system is coupled to the A/C system and the charge air is cooled below ambient temperature where necessary. This paper focusses on the transient response and fuel economy benefits achievable with such a thermal compressor when taking a bespoke A/C compressor strategy into account. The required components are packaged within the engine bay of a C-segment vehicle and results from engine and vehicle testing are presented. The climatic wind tunnel tests confirm that typical A/C systems are designed for a rapid cabin cool down and are oversized for regular operation afterwards. Depending on the ambient conditions and cabin temperature in many situations excess cooling power is available which can be used to realise a thermal compressor. The promising engine and vehicle test results reveal that charge air sub-cooling allows for both transient response and fuel economy benefits using the right sized components and an appropriate charging strategy. Although the components (indirect charge air cooler, chiller, bypass) tested in this first demonstrator are off the shelf and not yet optimised in terms of package size or functional integration, they do fit within the engine bay of a typical C-segment vehicle.

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Dokumentinformationen

Titel :

Improvement of transient response with charge air sub-cooling: an integrative approach

Beteiligte:

Wieske, Peter (Autor:in) / Dingelstadt, Rene (Autor:in) / Warth, Marco (Autor:in) / Stehlig, Jürgen (Autor:in) / Eilemann, Andreas (Autor:in) / Tremble, Paul (Autor:in)

Erschienen in:

Aachen Colloquium Automobile and Engine Technology, 23, E65415, E65414, AK Fz + Motorentechnik 2014, Aachener Kolloquium Fahrzeug- und Motorentechnik, 23 ; 715-731

Erscheinungsdatum :

2014

Format / Umfang :

17 Seiten, Bilder, 13 Quellen

Medientyp :

Aufsatz (Konferenz)

Format :

Datenträger

Sprache :

Englisch