A control method for an internal combustion engine including: setting a target valve opening degree of the first throttle valve in accordance with a load, sensing a valve opening degree of the second throttle valve, judging whether or not the valve opening degree of the second throttle valve is an opening degree on a closing side relative to a predetermined set valve opening degree, and correcting the valve opening degree of the first throttle valve to the opening degree on the closing side relative to the target valve opening degree when it is judged that the valve opening degree of the second throttle valve is the opening degree on the closing side relative to the predetermined set valve opening degree.

A method for an alternate control of a continuously variable valve duration (CVVD) malfunction may include a CVVD failsafe control to resolve a calculation error of a cylinder charge amount due to a hardware failure of a CVVD system with the cylinder charge amount determined by any one of flow rate alternate, flow rate deviation correction, and valve duration update if the hardware failure is recognized by a CVVD controller, and to apply the cylinder charge amount to secure an air amount for a combustion chamber.

A position sensor malfunction determination apparatus includes a determination unit and a controller. The determination unit is configured to perform a determination relating to electricity supply failure in a position sensor. The controller is configured to perform a fail-safe control. The determination unit is configured to determine whether each of conditions (A) and (B) is established, in a preliminarily determination before occurrence of the electricity supply failure in the position sensor is finally determined. The determination unit is configured to determine that the position sensor has a probability of the electricity supply failure when both the conditions (A) and (B) are determined to be established in the preliminarily determination. The controller is configured to execute, when the determination unit determines that the position sensor has the probability of the electricity supply failure, the fail-safe control before the occurrence of the electricity supply failure in the position sensor is finally determined.

A method for diagnosing a waste gate valve malfunction in a power generation system is presented. The method includes determining an actual pressure differential across a throttle valve. The method further includes determining an estimated pressure differential across the throttle valve based on one or more first operating parameters of the power generation system. Furthermore, the method includes determining an absolute difference between the actual pressure differential and the estimated pressure differential. Moreover, the method also includes comparing the absolute difference with a threshold value and if the absolute difference is greater than the threshold value, determining an operating condition of the throttle valve. Additionally, the method includes determining whether the waste gate valve has malfunctioned based on the determined operating condition of the throttle valve. An engine controller and a power generation system employing the method are also presented.

A method to detect and mitigate sensor or actuator degradation in an automobile system includes: collecting a signal data output from at least one device which is outputting the signal data in response to monitored operational parameters of a motor vehicle system; analyzing patterns of the signal data compared to a signal data output from a nominal operating one of the at least one device using an artificial intelligence program; and identifying when the patterns of the signal data exceed a threshold level indicating the at least one sensor or actuator is operating in a degraded condition.

A system and a method for injector injection error diagnosis include a controller which performs the method having a diagnostic inrush condition control by satisfying air tank pressure of an air tank as an injector injection error diagnosis entry condition while presence or absence of the application of an air compressor is divided between injector injection error diagnosis entry and injector injection error diagnosis execution according to detection of operations of an engine system and an air pressure brake system.

A method is provided for adjusting timing of fuel injection into a combustion chamber of a compression-ignition engine. The method includes detecting a request for zero torque generation by the engine and cutting-off delivery of fuel into the combustion chamber during the detected zero torque request. The method additionally includes issuing a command to inject a test quantity of fuel into the combustion chamber during the detected request for zero torque generation. The method also includes assessing a timing delay between the command to inject the test quantity of fuel and a start of the test quantity injection, and determining a compensation for the assessed timing delay. The method additionally includes detecting a request for positive torque generation by the engine. The method further includes commanding a shift in the timing of fuel injection into the combustion chamber by the determined compensation during the engine's positive torque generation.

A controller for controlling a fuel injection valve and a fuel pressure adjustment mechanism sets an air-fuel ratio of a fuel-air mixture to be generated within a combustion chamber to be equal to or leaner than a theoretical air-fuel ratio, based on an operating condition of an engine; drives the fuel injection valve, based on the set air-fuel ratio; estimates a deposition amount of deposits on an injection hole of the fuel injection valve, based on an operating condition of the engine; causes the fuel pressure adjustment mechanism to increase the fuel pressure, when the estimated deposition amount of deposits exceeds a predetermined value; and restricts the fuel pressure from increasing, even when the estimated deposition amount of deposits exceeds the predetermined value, as long as the fuel-air ratio is set to an air-fuel ratio leaner than the theoretical fuel-air ratio.

A control unit, controller and non-transitory machine-readable medium for detecting a closing time of an injector valve are disclosed. The control unit is configured to receive a valve current profile of the injector valve, process the valve current profile using at least a slope discriminator, and determine a stuck status and a closing time (if applicable) of the injector valve based on an output of the slope discriminator.

A method for fault diagnosis in an electronic control unit (ECU) of an engine fuel injection system. The method includes keeping the ECU and the engine fuel injection system at a set of pre-defined conditions, measuring an electrical current consumption of the ECU, and detecting a status of the ECU based on the measured electrical current consumption. Keeping the ECU and the engine fuel injection system at the set of pre-defined conditions includes switching the ECU on by switching the engine fuel injection system on, and keeping the engine fuel injection system at a not-running state. Detecting the status of the ECU based on the measured electrical current consumption includes detecting a normal status responsive to the measured electrical current consumption being in a normal electrical current range, detecting a first hardware defect in the ECU responsive to the measured electrical current consumption being in a first electrical current range, and detecting a second hardware defect in the ECU responsive to the measured electrical current consumption being in a second electrical current range.