A method for detecting the malfunction of a software solution configured to generate data representing the instant of interruption of fuel injection of an internal combustion engine. The method comprises acquiring data by a data acquisition device which is connected to a measurement device fixed to an injector body and configured to emit data representing closure instants of an injection nozzle, recording the data generated by the software solution and the data emitted by the measurement device, over a predetermined duration, synchronizing the data generated by the software solution and the data emitted by the measurement device, and comparing the data generated by the software solution and the data emitted by the measurement device, the software solution being considered to be malfunctioning when they do not satisfy predefined criteria.

A method of testing a fuel injection system or components thereof includes running a high pressure fuel pump to provide fluid under pressure to the fuel injection system or components. The pump flow is controlled via an inlet metering valve by controlling current or voltage supplied to the inlet metering valve dependent on the power to the fuel pump.

An injector testing device includes a fluid pump, which is configured to convey a test oil; a motor, which is connected mechanically to the fluid pump and is configured to drive the fluid pump; at least one injector holding device for mounting at least one injector to be tested; and a rail, which is configured to receive the test oil conveyed by the fluid pump and to fluidly connect to at least one injector to be tested. In this context, the rail is mounted in the injector testing device in such a manner, that it may be swiveled with respect to the at least one injector holding device, in order to align it with the injector to be tested.

An injector testing device includes a fluid pump configured to convey a test oil; a motor mechanically connected to the fluid pump and configured to drive the fluid pump; and a rail configured to receive the test oil conveyed by the fluid pump and to fluidly connect to at least one injector to be tested. The fluid pump, the motor, and the rail are supported elastically in the injector testing device as a common assembly.

A control system for an engine includes one or more processors configured to determine when a change in one or more of oxygen or fuel supplied to an engine. The one or more processors also are configured to, responsive to determining the change in oxygen and/or fuel supplied to an engine, direct one or more fuel injectors of the engine to begin injecting fuel into one or more cylinders of the engine during both a first fuel injection and a second fuel injection during each cycle of a multi-stroke engine cycle of the one or more cylinders.

Methods and systems are disclosed for operating an engine that includes fuel injectors that supply fuel to cylinders of the engine. According to the methods and system, variation of individual fuel injection amounts injected by a sole fuel injector are determined so that it may be determined if individual fuel injector variation may be contributing to engine air-fuel ratio variation.

A fuel injection control device includes a conduction time calculation unit, a detection unit, an estimation unit, a correction unit, a sudden change determination unit, and a reflection speed setting unit. The detection unit detects a physical quantity having a correlation with an actual injection quantity during the partial lift injection. The estimation unit estimates the actual injection quantity on the basis of a detection result of the detection unit. The correction unit corrects the requested injection quantity by a correction quantity corresponding to a deviation between the actual injection quantity and the requested injection quantity. The sudden change determination unit determines whether or not the correction quantity is in a sudden change state on the basis of whether or not the correction quantity has changed from a previous value by a prescribed quantity or more. The reflection speed setting unit sets the reflection speed.

A method of operating a fuel injector includes determining an actual energizing time correction value for a fuel injector at a first fuel rail pressure, calculating an extrapolated energizing time correction value by performing a mathematical calculation on the actual energizing time correction value, and controlling the operation of the fuel injector based on the actual energizing time correction value and the extrapolated energizing time correction value.

A device (1) for measuring the injection rate dm(t)/dt of an injection valve (2) for a fluid (4a), wherein m(t) is the injection quantity of the fluid (4a) as a function of the time (t), having a measurement volume (3) which is closed off on all sides and which is filled with a test fluid (4), having an opening (5a) in one wall (5) of the measurement volume (3) for the purposes of receiving the injection valve (2) such that the injection valve (2), in the installed position, projects with at least one injection opening (2a) into the measurement volume (3), and having a pressure sensor (6) which is arranged in the measurement volume (3), wherein correction means (8, 8a, 9a, 9b, 9c) are provided for determining the propagation time of a pressure wave (12), which originates from the injection opening (2a) and which propagates through the test fluid (4), to the pressure sensor (6) and for correcting the measured injection rate dm(t)/dt, taking said propagation time into consideration, to give a rectified injection rate dm(t)/dt. A method for producing the device (1), wherein the characteristic map (8a) is determined by way of a fluid-dynamic simulation of the time-dependent and position-dependent local speed of sound c(t,x) in a partial volume of the measurement volume (3) which encompasses at least the path (11) from the injection opening (2a) to the pressure sensor (6), which simulation is based on at least one time-dependent boundary condition for the pressure (p) in the measurement volume (3) and/or for the injection quantity (dm). A method for measuring the injection rate dm(t)/dt of an injection valve (2) for a fluid (4a).

A method for matching the performance of a plurality of electronic fuel injectors, includes: applying a supply voltage to a control module; applying an operating voltage signal having a pulse width to each of the plurality of electronic fuel injectors individually via the control module; measuring an amount of time that each of the plurality of electronic fuel injectors supplies fuel; individually adjusting an operating voltage supplied to each of the plurality of electronic fuel injectors to cause each of the electronic fuel injectors to deliver fuel for a substantially same amount of time.