AIR INTAKE-CONTROLLING DEVICE FOR MULTI-CYLINDER INTERNAL COMBUSTION ENGINE

摘要

An air intake-controlling device has intake valve lift amount-regulating means for regulating the amounts of lift of intake valves; means for detecting differences, between cylinders, of the amounts of air sucked into the individual cylinders; means for calculating, based on the differences detected by the detecting means, an intake air correction amount by cylinder so as to reduce the differences in air amounts between the cylinders; and means for regulating an intake air amount by cylinder in accordance with the correction amount of each cylinder calculated by the calculating means. The structure above effectively constrains the variation in the amounts of intake air between the cylinders, where the variation is resulted from varied dimensions occurring in the production of the constituting components of a lift amount-regulating mechanism and aging including wear. Further, variation in torque, vibration, and variation in air-fuel ratios between cylinders can be reduced, operability and exhaust emission characteristics can be improved, post-adjustment of a lift amount becomes unnecessary, costs are reduced by relaxed accuracy requirements for components, and mass productivity is increased.