Abstract: A control system for an internal combustion engine having a particulate filter is disclosed. The control system may have a sensor configured to detect a performance parameter of the particulate filter and generate a corresponding signal. The control system may also have a controller in communication with the sensor and the internal combustion engine. The control system may be configured to receive the signal and determine a soot loading status of the particulate filter based on the signal. The control system may be further configured to modify operation of the internal combustion engine based on the soot loading status during normal operation of the particulate filter.

Abstract: A method and apparatus for controlling a temperature in a combustion cylinder in an internal combustion engine. The cylinder is fluidly connected to an intake manifold and an exhaust manifold. The method and apparatus includes increasing a back pressure associated with the exhaust manifold to a level sufficient to maintain a desired quantity of residual exhaust gas in the cylinder, and varying operation of an intake valve located between the intake manifold and the cylinder to an open duration sufficient to maintain a desired quantity of fresh air from the intake manifold to the cylinder, wherein controlling the quantities of residual exhaust gas and fresh air are performed to maintain the temperature in the cylinder at a desired level.