Showing papers on "Spark-ignition engine published in 1968"

Fluidic adaptive spark advance system

Abstract: SPARK TIMING IN A SPARK IGNITION ENGINE IS CONTROLLED TO PROVIDE MAXIMUM ENGINE TORQUE BY UTILIZING A FLUIDIC LOGIC CIRCUIT IN COMBINATION WITH AN ACTUATOR FOR SELECTIVELY ADVANCING AND RETARDING SPARK TIMING IN RESPONSE TO FLUID SIGNALS AND A SENSOR FOR DETECTING INCREASING AND DECREASING ENGINE TORQUE. AT ANY GIVEN ENGINE SPEED THE LOGIC CIRCUIT SEEKS THE ACTUATOR DIRECTION WHICH PRODUCES INCREASING TORQUE BY PROVIDING SIGNALS WHICH MOVE THE ACTUATOR ALTERNATELY TO ADVANCE AND RETARD THE SPARK TIMING AND BY SENSING THE RESULTING INCREASE OR DECREASE IN ENGINE TORQUE. AN INCREASE IN ENGINE TORQUE CAUSES THE CIRCUIT TO CONTINUE TO MOVE THE SPARKTIMING ACTUATOR IN THE SAME DIRECTION, A DECREASE IN ENGINE TORQUE RESULTS IN A REVERSAL OF THE ACTUATOR DIRECTION. THE SPARK TIMING IS THEREFORE ADJUSTED UNTIL THE MAXIMUM TORQUE IS REALIZED AND THE CONTROL SYSTEM THEN ENTERS A LOW-AMPLITUDE MODE OF OSCILLATION ABOUT THE MAXIMUM-TORQUEPRODUCING ACTUATOR POSITION UNTIL A TORQUE VARIATION IS ONCE AGAIN SENSED.

Experimental and Analytical Studies of the Compression Ignition of Fuel-Oxidant Mixtures

Abstract: The paper describes an approach for predicting the time variation of the state of a non-adiabatic reacting charge undergoing a change in density, such as that in a motored autoigniting engine or the ‘end gas’ of a spark ignition engine. To describe accurately the rates of chemical reactions involved and to account for the production of intermediate combustion products and their survival, detailed chemical kinetics involving chain reactions are employed.To test the approach developed, hydrogen gas is employed as a fuel in the closely controlled environment of a specially developed compression apparatus which is closely akin to that of the piston engine, yet more amenable to control and analysis. Subject to the availability of reliable detailed kinetic data for the reactions involved very good agreement between theory and experiment can be achieved. The future implications and utilization of such an approach is discussed.

Combustion process for internal combustion engines

Abstract: 1,091,750. Combustion chambers. DAIMLER-BENZ A. G. Nov. 23, 1965 [Dec. 5, 1964; June 3, 1965], No. 49675/65. Heading F1B. In a spark ignition engine the combustible mixture rotates about the cylinder axis and is compressed into a combustion chamber 6 in the piston head.