An apparatus for diagnosing an exhaust gas recirculation (EGR) valve includes: an EGR apparatus including an EGR line connecting an exhaust line and an intake line and an EGR valve installed in the EGR line; an electric supercharger installed in the intake line to change an internal pressure of an intake manifold; a manifold pressure sensor measuring the internal pressure of the intake manifold; and a controller that when an engine is stopped while a vehicle is running, learns on an amount of opening of the EGR valve, diagnoses a fixation of the EGR valve and e a leakage of the EGR valve based on the internal pressure of the intake manifold detected by the manifold pressure sensor.

Proposed is a gas heat-pump system capable of supplying recirculation exhaust gas to an engine using an exhaust gas turbocharger and thus actively controlling an amount of the flowing recirculation exhaust gas and pressure thereof.

A regeneration system for a vehicle includes: a particulate module configured to determine an amount of particulate trapped within a particulate filter, the particulate filter configured to filter particulate from exhaust output from an engine; and a regeneration control module configured to, in response to a determination that the amount of particulate trapped within the particulate filter is at least a predetermined amount: close a wastegate of a turbocharger; and open an EGR valve connected (a) to an intake system of the engine downstream of the turbocharger and (b) to upstream of the particulate filter, the closing of the wastegate and the opening of the EGR valve flowing air from (a) the intake system to (b) upstream of the particulate filter through the EGR valve without the air entering the engine.

A system and method of integrating an engine having dynamic skip fire control with an exhaust gas recirculation system in a turbocharged internal combustion engine is described. An engine control system determines an appropriate firing pattern based at least in part on a desired exhaust gas recirculation flow rate. Signals from sensors in the intake manifold and exhaust system may also be used as part of a feedback loop to determine a desired exhaust gas recirculation flow rate.

A method for preventing an engine air flow calculation error applied to an engine system may classify an engine operation area of an engine into a sensor measurement deviation generation area, medium/high load areas, and a low load area by an ECU, and classify an air flow calculation applied to a cylinder charging amount of the engine as one of an air flow calculation control applying a compensation measurement air flow to the sensor measurement deviation generation area, an air flow calculation control applying a measurement pressure to the medium/high load areas, and an air flow calculation control applying a measurement air flow to the low load area, excluding influence of an HFM sensor error causing a change in a fresh air charge and inaccuracy of an exhaust gas recirculation (EGR) air flow modeling/active purge air flow modeling in the entire operation area of the engine.

Systems, apparatus, and methods are disclosed that include a divided exhaust engine with at least one primary EGR cylinder and a plurality of non-primary EGR cylinders. The systems, apparatus and methods control the amount of recirculated exhaust gas in a charge flow in response to EGR fraction deviation conditions.

An apparatus includes an engine module, an in-cylinder content module, and an engine out NOx module. The engine module is structured to interpret engine in-cylinder data regarding an operating condition within a cylinder of an engine, wherein the engine in-cylinder data includes an engine torque, an engine speed, a rail pressure, and a start-of-injection. The in-cylinder content module is structured to interpret at least one additional in-cylinder data point regarding the operating condition within the cylinder of the engine. The engine out NOx module is structured to determine an engine out NOx amount responsive to the engine in-cylinder data and the at least one additional in-cylinder data point.

An apparatus for diagnosing an exhaust gas recirculation (EGR) valve includes: an EGR apparatus including an EGR line connecting an exhaust line and an intake line and an EGR valve installed in the EGR line; an electric supercharger installed in the intake line to change an internal pressure of an intake manifold; a manifold pressure sensor measuring the internal pressure of the intake manifold; and a controller that when an engine is stopped while a vehicle is running, learns on an amount of opening of the EGR valve, diagnoses a fixation of the EGR valve and e a leakage of the EGR valve based on the internal pressure of the intake manifold detected by the manifold pressure sensor.

An Exhaust Gas Recirculation (EGR) effective flow diagnosis method includes: measuring an EGR gas temperature by an EGR gas temperature sensor under an EGR gas temperature rise condition of an EGR system on an intake line; determining the degree of the EGR gas temperature rise; and determining whether an EGR effective flow is excessive or insufficient according to the degree of the EGR gas temperature rise.

The present invention is an on-board vehicle emissions measurement system. The system comprises at least one sensor (CAP) downstream from the aftertreatment system, and optionally a sensor plugged into the vehicle diagnostics port, and a computer (SIN) including models (MOD VEH, MOD MOD, MOD POT). According to the invention, emissions determination is based on the signal from sensor (CAP) and on models (MOD VEH, MOD MOT, MOD POT).