A method for correcting a deviation of static flow rates of GDI injectors is provided. The method includes calculating a target pressure drop amount for each cylinder and a relative pressure drop amount for each cylinder from a detected pressure drop amount. An injection correction factor for each cylinder is primarily adjusted by comparing the relative pressure drop amount for each cylinder, with an average of relative pressure drop amounts of all cylinders. The injection correction factor is then secondarily adjusted by comparing an average of injection correction factors of all cylinders with 1.

A method for correcting a deviation of static flow rates of GDI injectors is provided. The method includes calculating a target pressure drop amount for each cylinder and a relative pressure drop amount for each cylinder from a detected pressure drop amount. An injection correction factor for each cylinder is primarily adjusted by comparing the relative pressure drop amount for each cylinder, with an average of relative pressure drop amounts of all cylinders. The injection correction factor is then secondarily adjusted by comparing an average of injection correction factors of all cylinders with 1.

A ruggedized engine control module (ECU) system includes a plugin-pod, a connector configured to connect the plugin-pod to a connector of an ECU, and signal processing circuitry. The ruggedized ECU system further includes a ruggedized enclosure for the connector and the signal processing circuitry. The ruggedized enclosure is configured to mount the plugin-pod to the ECU. The connection circuit includes signal processing circuitry configured to receive signals from at least one of the connectors, process the signals, and output the processed signals. The ruggedized ECU is configured to dissipate heat from the signal processing circuitry.

A ruggedized engine control module (ECU) system includes a plugin-pod, a connector configured to connect the plugin-pod to a connector of an ECU, and signal processing circuitry. The ruggedized ECU system further includes a ruggedized enclosure for the connector and the signal processing circuitry. The ruggedized enclosure is configured to mount the plugin-pod to the ECU. The connection circuit includes signal processing circuitry configured to receive signals from at least one of the connectors, process the signals, and output the processed signals. The ruggedized ECU is configured to dissipate heat from the signal processing circuitry.

According to one or more embodiments of the technical solutions described herein, a control system in a motor vehicle that includes an internal combustion engine includes an oxygen sensor, and an oxygen sensor diagnosis module to diagnose the oxygen sensor. The oxygen sensor diagnosis includes performing an intrusive rich-to-lean diagnostic for the oxygen sensor, and detecting a lean-to-rich diagnostic event. In response, the diagnosis includes performing a passive lean-to-rich diagnostic for the oxygen sensor, the lean-to-rich diagnostic event comprising a fuel enrichment.

According to one or more embodiments of the technical solutions described herein, a control system in a motor vehicle that includes an internal combustion engine includes an oxygen sensor, and an oxygen sensor diagnosis module to diagnose the oxygen sensor. The oxygen sensor diagnosis includes performing an intrusive rich-to-lean diagnostic for the oxygen sensor, and detecting a lean-to-rich diagnostic event. In response, the diagnosis includes performing a passive lean-to-rich diagnostic for the oxygen sensor, the lean-to-rich diagnostic event comprising a fuel enrichment.

In various aspects, internal combustion engines, engine controllers and methods of controlling engines are described. The engine includes a camshaft and a two cylinder sets. Cylinders in the first are deactivatable and cylinders in the second set may be fired at high or low output levels. The air charge for each fired working cycle is set based on whether a high or low torque output is selected. In some implementations, the camshaft is axially shiftable between first and second positions. First cam lobes are configured to cause their associated cylinders to intake a large air charge during intake strokes that occur when the camshaft is in the first position. Second cam lobes for cylinders in the second set cause their associated cylinders to intake a smaller air charge when the camshaft is in the second position. Second cam lobes for cylinders in the first set deactivate their associated cylinders.

In various aspects, internal combustion engines, engine controllers and methods of controlling engines are described. The engine includes a camshaft and a two cylinder sets. Cylinders in the first are deactivatable and cylinders in the second set may be fired at high or low output levels. The air charge for each fired working cycle is set based on whether a high or low torque output is selected. In some implementations, the camshaft is axially shiftable between first and second positions. First cam lobes are configured to cause their associated cylinders to intake a large air charge during intake strokes that occur when the camshaft is in the first position. Second cam lobes for cylinders in the second set cause their associated cylinders to intake a smaller air charge when the camshaft is in the second position. Second cam lobes for cylinders in the first set deactivate their associated cylinders.

Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation to an intake passage via a first exhaust manifold and exhaust gas to an exhaust passage via a second exhaust manifold. In one example, a flow of exhaust (e.g., exhaust gas recirculation) from engine cylinders to the intake passage, upstream of a compressor, via an exhaust gas recirculation (EGR) passage and the first exhaust manifold may be adjusted by adjusting a timing of a first set of cylinder exhaust valves coupled to the first exhaust manifold. Additionally, the first set of cylinder exhaust valves open at a different time than a second set of cylinder exhaust valves coupled to the exhaust passage.

Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation to an intake passage via a first exhaust manifold and exhaust gas to an exhaust passage via a second exhaust manifold. In one example, a flow of exhaust (e.g., exhaust gas recirculation) from engine cylinders to the intake passage, upstream of a compressor, via an exhaust gas recirculation (EGR) passage and the first exhaust manifold may be adjusted by adjusting a timing of a first set of cylinder exhaust valves coupled to the first exhaust manifold. Additionally, the first set of cylinder exhaust valves open at a different time than a second set of cylinder exhaust valves coupled to the exhaust passage.