Electrically Heated Catalyst for Emissions Reduction for Euro7

For Euro7 real driving cycles require an increase in exhaust gas temperature at cold start. This paper presents results on the emissions reduction effects of using an electric heating catalyst. Different heating strategies for diesel and gasoline engines are discussed. The application in diesel engines requires a high heat input into the exhaust gas already at very low mass flows in order to heat up also the downstream components of the SCR system quickly. Measurements and simulations are used to show how the heat input is influenced by the geometry and the heat transfer surface of the heating element and how this is affected under different operating conditions. Measurements on the engine test bench show the potential for emission reduction. In addition, it is shown that a catalytic coating of the heating element results in a further increased emission reduction. Particular emphasis is placed on robustness in operation. The presented Lamella Heater is tolerant to fuel and AdBlue and due to its fully insulated design insensitive to condensate and particles.