Exhaust gas flaps

The Klubert + Schmidt GmbH, which is situated in the beautiful tourist region Frankische Schweiz, has been producing exhaust gas flaps for commercial vehicles, which are integrated in many of the products of renowned manufacturers, since 1953. In the Federal Republic of Germany, a third independent brake system is prescribed by §41 (15) of the Road Traffic Licensing Regulation for buses above 5.5 tons and trucks above a permissible overall weight of 9 tons. Such a brake system is supposed to bring a fully loaded commercial vehicle to a standstill on a slope of 7% and at a speed of 30 km/h (18.6 mph).
The exhaust gas flap developed and manufactured by Klubert + Schmidt is a brake system which fulfills these specifications. By closing the exhaust line by means of a throttle and by simultaneously regulating the fuel supply, a back pressure in the engine is caused. This leads to a brake effect in the commercial vehicle (up to 400 kW). This brake type provides 85 % of the required brake power. This way, the brake wear is reduced considerably. Also, maintenance costs and associated down times are reduced substantially.
The fading effect during brake operation, i.e. an undesired reduction of the brake effect due to strong heating of the brakes, does not occur. Therefore, this brake type is also referred to as "constant brake". This brake type offers the lowest costs per kilowatt brake power in comparison to other brake systems. The connection to the vehicle control computer and the integration into the brake management system is done by means of high-performance actuators.

Modern exhaust gas flaps are also used for a quick warming up of the engine or to keep it warm. This has a positive influence on fuel consumption and the emission of exhaust gases.

In addition, this feature supports the generation of heat in diesel particle filters which are becoming more and more important due to new European norms.
This way, Klubert + Schmidt contributes to traffic security and a cleaner environment in many European and American countries.