Abstract
Modern engines with direct injection are characterized by a combustion process with excellent thermal efficiency. As a result, these engines no longer offer sufficient heat in the coolant at cold ambient temperatures to satisfy the thermal needs for the passengers and for the warm-up of the engine simultaneously. One possibility to compensate the thermal deficit is the recovery of the heat of the exhaust gases. The possibilities and the limitations of the usage of exhaust heat will be demonstrated. With a system developed by Visteon additional measures can be taken to further increase the heat output to the passenger cabin and/or to the engine. The system will be described and the impact on warm-up and fuel consumption compared to other supplemental heating devices.