An air-to-fuel ratio control device for an internal combustion engine is disclosed, which comprises a pressure sensor for detecting the pressure P within a cylinder of the engine, and means for computing an actual value of the ratio (dP/d.theta.)max/Pmax, wherein (dP/d.theta.)max is the maximum rate...http://www.google.com/patents/US4928653?utm_source=gb-gplus-sharePatent US4928653 - Air-fuel ratio control device for an internal combustion engine
