The exhaust gas temperature control through an adequate thermal management of the engine

Abstract

In general, the efficiency of the currently used aftertreatment solutions is strongly conditioned by the temperature of the exhaust gases. The regeneration capability of the aftertreatment equipment can be improved by intentionally rising the temperature of the exhaust gases. When using technologies like hybrid transmission, engine Start/Stop and cylinder deactivation, the temperature must be also intentionally increased in order to assure a high conversion rate. This paper presents the experimental research regarding to the effects of changing some engine parameters on exhaust gases temperature and performances of a compression ignition engine. The values of these parameters were modified as follows: the coolant temperature was modified 4 times (60, 70, 80 and 90 °C), the injection timing was modified 5 times (25, 20, 15, 10 and 5 °CA before top dead center), the injection strategy was changed 3 times (main injection, one and two pre-injection) and engine speed was modified in the range 1800-2800 rpm. The number of injections and the thermal regime modify the least temperature of the exhaust gases, with values of up to 44 °C. Yet, by the modification of the load, speed and of the injection advance greater temperature of the exhaust gases variations with values of up to 95°C.