Control of Cylinder Consistency for a Two-Stroke Spark-Ignition Engine

To solve the inconsistency problem of multi-cylinders of two-stroke spark-ignition engines and use the air–fuel ratio for the control of cylinder consistency on the basis of the factors that influence the consistency between cylinders, an individual cylinder fuel compensation control strategy based on the air–fuel ratio deviation including feedforward and feedback control was proposed. The basic fuel injection quantity was determined using the feedforward control. Proportion–integration–differentiation feedback control based on the air–fuel ratio deviation helped realize the compensation and correction of individual cylinder fuel. To achieve consistency control between cylinders, engine bench tests for the idle and small-load conditions were conducted on a two-cylinder two-stroke spark-ignition engine. The test results show that the reduced pressure difference between the two cylinders was less than 10%. The head temperature and air–fuel ratio between the two cylinders were also reduced. The air–fuel ratio of the two cylinders was similar to the target value, which indicates that the control strategy has a good control effect.