Systems and methods to reduce torsional conditions in an internal combustion engine

摘要

An internal combustion engine includes a number of cylinders and a controller operably connected to interpret operating parameters related to the operation of the number of cylinders. A cylinder torque adjustment for each cylinder is determined from the operating parameters to provide a torque balancing response that reduces noise, vibration and/or harshness in engine operation.

主权项

1. A system, comprising: an internal combustion engine having a plurality of cylinders that receive a charge flow from an intake manifold, at least one of the plurality of cylinders comprising a primary exhaust gas recirculation (EGR) cylinder connected to an EGR manifold that is flow connected to the intake manifold and remaining ones of the plurality of cylinders being in flow communication with an exhaust manifold that is flow connected to an exhaust passage that emits exhaust gas from the remaining ones of the plurality of cylinders; and a controller operably connected to the internal combustion to receive a plurality of operating parameters associated with operation of the plurality of cylinders, wherein the controller is configured to: determine a net torque output of each of the plurality of cylinders; determine a base net torque output from the net torque outputs of the plurality of cylinders; determine a torque adjustment for each of the plurality cylinders as a function of the base net torque output and the net torque output of the respective cylinder; and reduce a torque imbalance of the internal combustion engine by adjusting a load on the engine in response to the torque adjustments for the plurality of cylinders so the net torque output of each of the plurality of cylinders corresponds to the base net torque output.