Apparatus for controlling recirculated exhaust gas quantities in internal combustion engines,申请号US19850733425-传众专利搜索

Apparatus for controlling recirculated exhaust gas quantities in internal combustion engines

申请公布号：US4620520(A)

申请号：US19850733425

申请日期：1985.05.13

申请公布日期：1986.11.04

申请人：

ROBERT BOSCH GMBH

发明人：MAISCH, WOLFGANG;SCHAEFER, WOLFGANG

分类号：F02M25/07;(IPC1-7):F02M25/06

主分类号：F02M25/07

摘要：An apparatus is proposed which serves to control the quantity of exhaust gas recirculated from the exhaust gas system of an internal combustion engine to its intake side. The apparatus includes a pneumatic final control element having a diaphragm defining a work chamber, the diaphragm arranged to actuate a valve closing member of an exhaust gas recirculation (EGR) valve. Via a control pressure line, a flow line leading to the atmosphere and a connecting line leading to the intake tube downstream of a throttle valve are connected to the work chamber. A check valve opening toward the intake tube, a reservoir and a throttle restriction are disposed in the connecting line. A bypass line having a bypass valve bypasses the throttle restriction. Disposed in the flow line is an electrofluid converter of the nozzle/bounce plate type, by means of which, triggered by an electronic control unit in accordance with operating variables of the engine, a predetermined pressure drop between the atmosphere and the pressure in the work chamber can be established.