This paper describes the available freedoms of control of present and future engine cooling and vehicle air-conditioning systems and what contributions can be made to improving mileage, cutting exhaust pollution and enhancing occupants' comfort. It presents examples of how further synergies can be exploited as a consequence of joint investigation of the two systems. The increasing conflicts of objectives combined with future availability of the required actuators and control electronics lead to the approach of 'thermal management' as a convergence of the complete systems for engine cooling and vehicle air-conditioning. 'Thermal management' covers the description and control of substance and energy flows within the vehicle. In order for engine cooling and vehicle air-conditioning to fulfil their functions, energy must be expended for operating compressor, auxiliary heaters, fans and pumps. At higher vehicle speeds, the cooling air is supplied primarily by the dynamic pressure of the air flow around the vehicle, which increases the vehicle's air resistance. The charge-air cooler and exhaust gas cooler represent an additional obstruction to air flow in the engine air intake and in the exhaust duct, and increase the gas displacement work of the engine. The heat given off by the engine is indispensable for the function of cabin heating, but also the powertrain has to be raised as quickly as possible to operating temperature by the incoming heat flows and held at this during periods of low engine loading. Engine cooling and vehicle air-conditioning draw on the same energy resources. As examples for the thermal management interactions between engine cooling and vehicle air-conditioning using auxillary heaters, the use of exhaust gas cooler as auxillary heater and the fine-tuning of transmission oil temperature control are described.
Thermal management - Definition and demands
Thermisches Management - Definitionen und Anforderungen
2002
12 Seiten, 14 Bilder, 3 Quellen
Conference paper
English
Thermal management - definition and demands
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