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Devices for recirculating exhaust gases in internal combustion engines
| Details |
Inventors: Henault, Claude;
Assignee: Regie Nationale des Usines Renault (BOTH OF, FR); Automobiles Peugeot (BOTH OF, FR)
Primary Examiner: Burns; Wendell E.
Assistant Examiner:
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher
The invention is directed to means for improving the operating conditions of internal combustion engines by the selective recirculation of exhaust gases as a function of the different engine speeds. More particularly, the exhaust gases are recirculated when starting the engine, during the period preceding the actual ignition, during low engine speed periods corresponding to a considerable and pre-adjusted induction vacuum, and also when the engine is operating under full-load conditions, the recirculation being discontinued at the other engine speeds, to reduce the atmospheric pollution and improve the engine performances. |
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DETAILED DESCRIPTION What is claimed as new is: 1.
An exhaust gas recirculation control device for an internal combustion engine comprising an induction manifold, an exhaust gas expansion muffler, recirculation means interconnecting said muffler and said manifold for recirculating the exhaust gas, at least one recirculation control valve inserted in said recirculation means, electromagnetic means for actuating said valve, vacuum means for actuating said valve, a starter motor swtich, a switch responsive to full-load conditions of the engine, said starter motor switch being electrically connected with said electromagnetic means so as to cause the full opening of said valve when starting the engine during the period preceding the engine firing, said switch responsive to full-load conditions being electrically connected with said electromagnetic means so as to cause the full opening of said valve at full-load conditions of the engine, and said vacuum means being connected to said induction manifold so as to cause a variable opening of said valve when the induction vacuum exceeds a pre-adjusted value.
2.
An exhaust gas recirculation control device according to claim 1 further including a pipe connected in parallel with said recirculation means to said recirculation control valve, a solenoid-operated valve inserted in said pipe, said solenoid-operated valve being electrically connected with said switch responsive to full-load conditions so as to cause the opening of said solenoid-operated valve at full-load conditions of the engine.
3.
An exhaust gas recirculation control device according to claim 1 wherein said recirculation control valve includes a body, said body having a flexible bellows as a wall, and a needle valve mounted in said body within said flexible bellows; a control rod connected to said needle valve, said control rod forming part of said electromagnetic means and said vacuum means; a common support provided for said recirculation control valve and said electromagnetic and vacuum means; and a variable prestressing compression spring interposed between said support and said needle valve
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Manufacturing Materials 
