A system includes a combustion engine having an intake manifold and an exhaust manifold, an exhaust gas recirculation (EGR) system coupled to the combustion engine and configured to route exhaust generated by the combustion engine from the exhaust manifold to the intake manifold, and a first knock sensor coupled to the combustion engine and configured to measure vibrations of the combustion engine and output a first vibration signal. The system also includes a controller communicatively coupled to the combustion engine, the knock sensor, the EGR system, or any combination thereof. The controller is configured to determine a peak firing pressure (PFP) within the combustion engine and control operations of both the combustion engine and the EGR system based on the PFP.

A method for processing sensor signals in a control unit of a motor vehicle and a control unit for carrying out the method. The control unit is provided for the open-loop and/or closed-loop control of a system and acquires signals from this system. The system is modeled with the aid of a model, at least one value being ascertained for a slow signal based on the model.

A method for processing sensor signals in a control unit of a motor vehicle and a control unit for carrying out the method. The control unit is provided for the open-loop and/or closed-loop control of a system and acquires signals from this system. The system is modeled with the aid of a model, at least one value being ascertained for a slow signal based on the model.

The present disclosure includes a system and method for regulating exhaust gas recirculation (EGR) in an engine. In one embodiment, the system may include a knock sensor coupled to the engine that sends a signal corresponding to at least one operating condition of the engine to a controller. The controller may estimate an amount of EGR gas administered to the engine and regulate the amount of EGR gas being administered to the engine when the estimated amount of EGR gas is not an effective amount.

An engine configured to prevent a variation in constituents of exhaust gas flowing into an EGR passage. The engine comprises: a header pipe joined to a cylinder; an EGR passage through which exhaust gas emitted from the cylinder is recirculated to an intake pipe; a vortex chamber to which the header pipe is connected; a receiving surface with which the exhaust gas flowing into the vortex chamber collides; an exhaust gas purification device; and a connector pipe connecting the vortex chamber to the exhaust gas purification device. One end of the exhaust gas recirculation passage is joined to the connector pipe.

An engine configured to prevent a variation in constituents of exhaust gas flowing into an EGR passage. The engine comprises: a header pipe joined to a cylinder; an EGR passage through which exhaust gas emitted from the cylinder is recirculated to an intake pipe; a vortex chamber to which the header pipe is connected; a receiving surface with which the exhaust gas flowing into the vortex chamber collides; an exhaust gas purification device; and a connector pipe connecting the vortex chamber to the exhaust gas purification device. One end of the exhaust gas recirculation passage is joined to the connector pipe.