An engine control device configured to control an engine includes: a turbocharger having a turbine that is configured to be driven by exhaust gas of the engine; and a compressor coupled to the turbine and configured to compress fresh air; an air-bypass passage that communicates between an upstream and a downstream of the compressor; an air-bypass valve configured to open/close the passage; a canister configured to store evaporated fuel gas generated in a fuel tank; an ejector configured to suction the evaporated fuel gas from the canister by using differential pressure between the upstream and the downstream of the compressor and introduce the evaporated fuel gas to the upstream; a purge valve configured to open/close a purge passage through which the evaporated fuel gas is to delivered from the canister to the ejector; and a purge valve diagnosis unit configured to detect stuck open malfunction of the purge valve.

In order to prevent an abnormal combustion due to oil, a restriction region (B) is designated on a low-speed and high-load side of an internal combustion engine (1), and an opening of throttle valve (12) is restricted so that an engine operating condition is not observed within the restriction region (B). A predetermined designated inspection region (A) is set so as to include the restriction region (B), and it is judged whether or not the abnormal combustion actually occurred when the internal combustion engine (1) is running within the designated inspection region (A). If the abnormal combustion was detected, the restriction region (B) is expanded, meanwhile, if the abnormal combustion was not detected, the expanded restriction region (B) is gradually decreased. If the abnormal combustion occurred at a shorter interval than a threshold value, the restriction region (B) is expanded at once to a predetermined size.

An engine system for a vessel propulsion device includes an engine including an intake amount adjusting unit and an ignition plug, and configured to generate a drive force for the vessel propulsion device. The engine system includes an ignition timing control unit, a knocking detecting unit, a knocking retard control unit that retards the ignition timing of the ignition plug by a unit retard amount when the knocking detecting unit detects knocking, an abnormality judging unit that, when a state where the knocking detecting unit detects knocking at intervals within a predetermined time continues, judges that an abnormality has occurred based on a continued state of knocking detection, and an intake amount limiting unit that limits the intake amount of the engine based on judgment of an abnormality made by the abnormality judging unit.

An injection control device includes: an instruction output unit outputting an instruction energization time that is an instruction value of an energization time of a fuel injection valve corresponding to a target injection amount; an energization controller controlling energization of the fuel injection valve based on the instruction energization time; an area corrector correcting an area of an electric current flowing through the fuel injection valve when the fuel injection valve is driven by the electric current, calculating a correction time of the energization time, and correcting the instruction energization time; an abnormality determiner determining that an abnormality related to the area correction has occurred when the correction time reaches a predetermined upper limit value; and a normal-return determiner executing, after the abnormality determiner determines that the abnormality related to the area correction has occurred, a normal-return determination at an execution timing of when a degree of influence of the abnormality on an emission becomes equal to or less than a predetermined value, for determining whether or not an abnormal state in which the abnormality related to the area correction has been caused has returned to a normal state.

A method for controlling an internal combustion engine, wherein a first engine control device generates a control signal to actuate a function of the engine. A switchover device transmits the control signal of the first control device to the engine to actuate the function of the engine. The first control device transmits a sign-of-life signal which indicates functionality of the control device to the switchover device. The first engine control device does not transmit the sign-of-life signal or transmits the signal incorrectly if a fault occurs which endangers proper actuation of the function of the engine by the first engine control device. If the sign-of-life signal of the first engine control device is not or is incorrectly received by the switchover device, the switchover device stops transmitting the control signals of the first engine control device and starts transmitting a control signal generated by a second engine control device to the engine to actuate the function of the engine.

A method for operating an internal combustion engine that includes at least two cylinders, includes operating the internal combustion engine in a first operating mode in partial engine operation, in which at least one of the cylinders is not fired, monitoring the internal combustion engine during the partial engine operation for potentially torque-increasing errors, and switching over from the partial engine operation into a full engine operation in which all of the cylinders are fired when a potentially torque-increasing error is detected.

Methods, systems, and computer program products are provided for controlling an internal combustion that comprises a cylinder having a space arranged to receive air and fuel, a piston disposed in the cylinder, and a crankcase being in fluid communication with the cylinder. The method comprises determining an uncontrolled behavior due to fluid flow between said crankcase and said cylinder space and combustion of such fluid, which entails: determining whether a powertrain of the vehicle is disengaged; determining whether the engine speed is increasing; and determining whether said cylinder space is receiving fuel. The method further comprises determining that an uncontrolled behavior is occurring if the conditions that: said powertrain is disengaged, the engine speed is increasing and said cylinder space is not receiving any fuel, are fulfilled.

In the case where a throttle valve has a sticking abnormality, a hybrid vehicle performs failsafe operation (limp home mode) with fixing the throttle valve to an opener position (S100) and sets a restoration diagnosis cooling water temperature T1 such as to decrease with a decrease in state of charge SOC of a battery (S120). When cooling water temperature Tw of the engine becomes equal to or higher than the restoration diagnosis cooling water temperature T1, the hybrid vehicle performs sticking restoration diagnosis to determine whether the throttle valve is restored from the sticking abnormality (S150). This allows for earlier diagnosis of whether the throttle valve is restored from the sticking abnormality at the lower state of charge SOC of the battery and enables the hybrid vehicle to return to normal operation at an earlier time. As a result, this ensures the more adequate sticking restoration diagnosis.

Systems and a method are provided for determining a change in performance of a radiator fan. In one example, a system includes a controller configured to receive a signal output from an accelerometer positioned proximately to and/or operatively coupled with a bearing of a radiator fan, process the signal to determine a peak to peak acceleration value, and indicate a change in performance of the radiator fan when the peak to peak acceleration value is greater than a designated threshold value.

Various methods and systems are provided for health assessments of a fuel system. In one example, a method for an inlet metering valve (IMV) includes reducing electrical driving of the IMV, monitoring a response time of the IMV in real-time responsive to the reducing, and determining if the IMV is degraded based on a response of IMV current over a duration, the duration beginning after an initial decrease in current caused by the reducing.