A controller is configured to control an internal combustion engine mounted on a vehicle. The controller includes processing circuitry. The processing circuitry outputs a valve closing signal to a shut-off valve, and executes, when a stopping operation of the internal combustion engine is performed, a determination process of determining whether the shut-off valve is stuck open based on a decrease amount of a passage fuel pressure. The controller does not execute the determination process when at least one of a condition that a vehicle speed is higher than a first determination speed and a condition that an engine rotation speed is higher than or equal to a second determination speed is met.

A process for identifying fueling system failure modes includes operating a failure mode model derived from a big data dataset, the big data dataset comprising field performance data received from a plurality of engine fueling systems including one or more injectors, the field performance data comprising injection pressures and injection quantitates for a plurality of injections performed by one or more injectors of the engine fueling systems, the failure mode model including a plurality of predetermined rules for evaluating operation of engine fueling systems; receiving target field performance data from a target fueling system including one or more target injectors configured to provide fuel to a target engine system for performance evaluation; evaluating the target field target performance data using the failure mode model to identify a failure mode of the target fueling system; and performing a compensatory action in response to the evaluating.

In one instance, disclosed herein is a method for controlling a fuel injector of an engine system, the method including: applying a first current to a spill valve solenoid to move a spill valve of the fuel injector to a closed spill position; reducing the first current applied to the spill valve solenoid to move the spill valve to an at least partially-open position; determining a dwell duration for the fuel injector based on an expected fuel pressure of the fuel injector; and after the determined dwell duration, increasing the first current applied to the spill valve solenoid to return the spill valve to the closed spill position.

This fuel circuit has a pumping device with a low-pressure stage and a high-pressure stage. The fuel circuit is configured to supply, at high-pressure, fuel collected from a fuel tank to injectors of an engine. A low-pressure circuit and a high-pressure circuit are included. A fuel filter, is arranged between an outlet of the low-pressure stage and an intake of the high-pressure stage. V fist pressure sensor is arranged upstream from the fuel filter, and a second pressure sensor is arranged between the fuel filter and the intake of the high-pressure stage.

A system and method for determining a value of a flow rate of a liquid in a vehicle engine system comprising a fluid tank (3), a pump (2), a fluid injector (1), with a fluid flow path from the pump to an injected zone (4), and an electronic control unit (5) for controlling opening of the injector, the method comprising:providing a loss estimation module (52), supplying as output a hydraulic loss coefficient (CP),carrying out a plurality of sequences of fluid injection, with values of a plurality of parameters (dP, P1, P0, T, X) being collected,calculating a theoretical quantity (QTH) of fluid injected during these injection sequences, with the aid of the values of the parameters (P1, P0, T, X),calculating an estimated actual quantity (QRE) of fluid injected during the injection sequences, by applying the loss coefficient (CP) to the calculation of the theoretical quantity of fluid.

[Problem] To prevent an abnormality of an engine that may occur due to switching from a first fuel to a second fuel.

[Solution] The engine system 100 includes an engine 1 that is capable of switching between a first mode in which a first fuel is combusted and a second mode in which at least a second fuel out of the first fuel and the second fuel is combusted, a first fuel supplier 6 that supplies the first fuel to the engine 1, a second fuel injection device 43 that supplies the second fuel to the engine 1, an air-fuel ratio controller 23 that controls the air-fuel ratio, a controller 7 that controls the first fuel supplier 6, the second fuel injection device 43, and the air-fuel ratio controller 23, and an acceptor 92 that accepts an instruction for the controller 7. When the acceptor 92 accepts an instruction for transition from the first mode to the second mode, the controller 7 executes self-diagnosis of at least one of the first fuel supplier 6, the second fuel injection device 43, and the air-fuel ratio controller 23 while maintaining the operation in the first mode, and determines whether to transition to the second mode based on a result of the self-diagnosis.

A system for diagnosing component failures of a combustion engine may include a pair of temperature sensors arranged on respective left and right exhaust manifolds of a combustion engine, a pair of pressure sensors arranged on respective left and right intake manifolds of the combustion engine, and a computing device in data communication therewith. The computing device may be configured for receiving temperature values and pressure signals and calculating delta temperature values and delta pressure values. The computing device may establish trend lines for the temperature values, the pressure values, the delta temperature values, and the delta pressure values and may compare the trend lines to a plurality of signatures stored on the computer readable storage medium. The computing device may identify a signature of the plurality of signatures that corresponds to the trend lines and classify the time as exhibiting a particular component failure.

A method of fuel injector management based on cylinder knock detection includes: receiving an individual cylinder knock count from a first cylinder; determining whether a knock metric is initialized for the first cylinder, whether the knock metric deviates from an established baseline knock metric after multiple cycles when the knock metric is initialized for the first cylinder, whether the knock metric is decreasing with respect to the established baseline knock metric when the knock metric deviates from the established baseline knock metric, whether a fuel system memory indicates rich, lean or healthy when that the knock metric is decreasing with respect to the established baseline knock metric, whether a knock adaptation control indicates a reduction of knock for the first cylinder, and updating a health status of a fuel injector based on the indication of rich, lean, or healthy.

This invention refers to a method for diagnosing faults in the operation of a fuel heating system associated with an internal combustion engine, that includes a plurality of routines to detection of several kinds of faults. The relevant concern is to provide a sufficiently robust solution implemented by computer, to conceive a fuel heating system that includes a main control unit and a heating control unit independent from each other, both comprising respective intelligences so that this latter is particularly able to perform several functions and/or routines relating to the self-diagnostic of the heating system. For such, a method for self-diagnostic of fuel heating system that includes at least one engine control unit ECU that includes a respective microcontroller, and at least one heating control unit HCU that includes a respective microcontroller, both fed by at least one tension source 10 interconnected to each other and to the at least heating element 13 through an electronic circuit that still includes, at least, one main relay 11 and at least one secondary relay 12.

A controller is applied to a fuel supply system. The controller is capable of controlling a hydrogen engine and a first shut-off valve and a second shut-off valve which are shut-off valves. The controller closes the shut-off valve when an operation for requesting stop of the hydrogen engine is performed by a user of a vehicle having the fuel supply system, and executes a failure determination routine for monitoring a drop speed of pressure of hydrogen gas on the downstream side of the shut-off valve while continuing operation of the hydrogen engine, and determining that the shut-off valve is not properly closed when the drop speed is slow. The controller stops the failure determination routine when the hydrogen engine is stopped due to an engine stall during execution of the failure determination routine.