Apparatus for actuating an adjustment device acting upon a control apparatus for exhaust recirculation in internal combustion engines

An apparatus for load-dependent actuation of an exhaust recirculation adjustment device in an internal combustion engine comprising a fuel injection pump, said fuel injection pump including a fuel supply chamber, a threshold comparison apparatus within said fuel supply chamber and a fuel quantity adjustment device adjustable in accordance with load, said threshold comparison apparatus including means defining plural passages, a first of said passages being stationary and a second of said passages being adjustable in accordance with the actuation of said fuel quantity adjustment device, said exhaust recirculation adjustment device including a valve for controlling exhaust gases from an exhaust manifold to an intake manifold and a hydraulic servomotor including an adjustment device connected to said valve for adjusting said valve, a pressure control line connected between said hydraulic servomotor and said first passage of said threshold comparison apparatus wherein the alignment of said first and second passages provides for a discharge of fuel under pressure from said fuel supply chamber of said injection pump into said control line and the flow of fuel out of the fuel supply chamber acts as a control variable for the actuation of said exhaust recirculation adjustment device;

• and a first relief line including an adjustable throttle connected between said hydraulic servomotor and a fuel supply;
• further wherein said fuel injection pump includes a second relief line connected thereto which extends away from said fuel supply chamber, said second relief line containing a scavenging throttle which is thereby capable of adjusting a scavenging fuel quantity, a pressure switch connected with said control line and said second relief line, said pressure switch arranged to control fluid flow through said second relief line.