Regulating device for metering a supplementary air quantity to improve combustion in combustion engines

In an auxiliary arrangement for the protection of an afterburner installation for the exhaust gases of an internal combustion engine having a regulating arrangement for the metering of a secondary air quantity, the improvement comprising:

• a source of fluid under pressure equal to or greater than atmospheric pressure;
• a switching installation instantaneously responsive to an emergency signal for switching off the fuel, said emergency signal representing an electrical impulse;
• means for initiating said electrical impulse upon exceeding a predetermined amount of unburned hydrocarbons;
• in the exhaust fuel reservoir means;
• fuel-air mixture forming means;
• and fuel conducting means between said fuel reservoir means and said fuel-air mixture forming means, control means linked to said source of pressure and actuatable by said emergency signal for releasing said fluid to contact the fuel and move the fuel by applying pressure thereto from said fuel conducting means and into said fuel reservoir means when said emergency signal is initiated;
• main jet means;
• said control means comprising a valve in a line connecting said source with a region of said mixture forming means, said region being downstream from said main jet means and being upstream from an exit point of a fuel-air mixture to said source of pressure, said valve reversing the flow of fuel when said emergency signal is initiated, the flow of fuel being directed away from said engine when said emergency signal is initiated;
• said valve comprising facing spring-loaded valve flaps;
• bell cranks on said valve flaps;
• sealing rings actuated by said valve flaps for sealing outlet openings of said valve when said emergency signal is absent;
• and actuating plunger means for synchronously actuating said valve flaps by said bell cranks for removing said sealing rings from said outlet openings when said plunger means receives said emergency signal.