Engine air management – maximum power, lower emissions

Combustion engines require air to burn fuel with the least possible residue. In addition, during operation they generate a stream of exhaust that can be used in many different ways. Precisely controllable butterfly valves from Knorr-Bremse offer multiple options.


Knorr-Bremse Systeme für Nutzfahrzeuge GmbH

Moosacher Str. 80
80809 München
Deutschland - Germany

Phone: +49 8935470

Throttle valves

Throttle valves from Knorr-Bremse have two main functions: First, they support vehicle deceleration by controlling the exhaust back pressure from the engine. Second, throttle valves are used to precisely control the exhaust stream for thermal management in the exhaust gas handling system. They are essential to ensuring exhaust gas treatment works efficiently.

The specialized valve design makes it possible to modulate the exhaust stream over a larger engine speed range. The valves are activated either pneumatically or via an electronic motor. Electronic drive throttle valves can precisely control the opening and closing position.

Key benefits:

  • Improved vehicle control
  • Improved deceleration over the entire engine speed range
  • Reduced risk of brake fading on continuous slopes
  • Reduced parking brake wear and lower maintenance costs
  • Reduced emissions during a cold start
  • Reduced Adblue consumption while maintaining the efficiency of the aftertreatment system
  • Customized adjustments to individual engine and vehicle requirements possible
  • Can be used to mount injectors, lambda, pressure and temperature sensors
Electrically Actuated Throttle Valves

Exhaust gas recirculation

Another way to reduce the emissions of combustion engines is to use an exhaust gas recirculation system. It mixes the fresh air flowing into the engine with a cooled sub-stream of the exhaust. This reduces nitrogen oxide emissions, in particular. To facilitate operating point dependent regulation of the exhaust gas recirculation quantity, high positioning precision and quick activation of the exhaust gas recirculation valve are essential. At the same time, the valve must be highly resistant to the technically challenging environmental conditions. With its expertise in activation technology, Knorr-Bremse makes valves for exhaust gas regulation into precise and robust actuators in the engine air management control circuit.

Key benefits:

  • Lower exhaust emissions
  • Optimal control depending on the current operating status
  • High positioning precision
  • High resistance

Further Topics