An engine control device controls an engine provided with an EGR device. The engine control device is provided with an abnormality determining unit, a restricted operation unit, and a restriction released operation unit. The abnormality determining unit determines whether an abnormality has arisen in the EGR device. The restricted operation unit performs restricted operation in which some functions of the engine are restricted, if the abnormality determining unit has determined that an abnormality has arisen in the EGR device. If a manipulation to release the restricted operation has been performed, the restriction released operation unit switches from restricted operation to restriction released operation in which the restrictions on some of the functions of the engine are released, and performs said restriction released operation.

An engine control device controls an engine provided with an EGR device. The engine control device is provided with an abnormality determining unit, a restricted operation unit, and a restriction released operation unit. The abnormality determining unit determines whether an abnormality has arisen in the EGR device. The restricted operation unit performs restricted operation in which some functions of the engine are restricted, if the abnormality determining unit has determined that an abnormality has arisen in the EGR device. If a manipulation to release the restricted operation has been performed, the restriction released operation unit switches from restricted operation to restriction released operation in which the restrictions on some of the functions of the engine are released, and performs said restriction released operation.

Systems and methods for determining whether or not a temperature sensor is degraded are presented. In one example, a determination of degradation of the temperature sensor is based on a difference between a temperature determined from output of the temperature sensor and an estimate of a temperature of a pressure sensor.

Systems and methods for determining whether or not a temperature sensor is degraded are presented. In one example, a determination of degradation of the temperature sensor is based on a difference between a temperature determined from output of the temperature sensor and an estimate of a temperature of a pressure sensor.

Methods and systems for unsticking a stuck gaspath actuator are disclosed. In one embodiment, an engine operating method includes adjusting exhaust valve timing of one or more cylinders of an engine in response to an indication that a gaspath actuator is stuck in position. In this way, pressure waves in an exhaust manifold and/or an intake manifold may be generated, which may act to unstick the gaspath actuator.

Methods and systems are provided for an EGR system reverse hose diagnostic. In one example, a method includes executing the reverse hose diagnostic in response to an EGR flowrate exceeding a threshold flow rate.

Methods and systems are provided for an EGR system reverse hose diagnostic. In one example, a method includes executing the reverse hose diagnostic in response to an EGR flowrate exceeding a threshold flow rate.

An engine system includes a delta pressure sensor configured to sense a pressure difference across an engine exhaust handling component and an electronic control system configured to determine a cold sensor condition permitting icing of the delta pressure sensor, determine a sensed pressure deviation condition indicative of deviation of the pressure difference sensed by the delta pressure sensor from a deviation limit, dynamically model a sensor heat transfer condition indicative of heating or cooling of the delta pressure sensor, determine that the sensor heat transfer condition is indicative of insufficient heating of the delta pressure sensor to mitigate icing of the delta pressure sensor, and determine an icing condition of the delta pressure sensor.

An engine system includes a delta pressure sensor configured to sense a pressure difference across an engine exhaust handling component and an electronic control system configured to determine a cold sensor condition permitting icing of the delta pressure sensor, determine a sensed pressure deviation condition indicative of deviation of the pressure difference sensed by the delta pressure sensor from a deviation limit, dynamically model a sensor heat transfer condition indicative of heating or cooling of the delta pressure sensor, determine that the sensor heat transfer condition is indicative of insufficient heating of the delta pressure sensor to mitigate icing of the delta pressure sensor, and determine an icing condition of the delta pressure sensor.

Methods and systems are provided for an EGR system reverse hose diagnostic. In one example, a method includes executing the reverse hose diagnostic in response to an EGR flowrate exceeding a threshold flow rate.