Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped

Official title: Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages

F02M26/01 (Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped) appears on 640 US grants and 597 published applications in this corpus.