A method for providing consistent actuator events for each of a plurality of consecutive actuator events of an electromagnetic actuator, includes applying a first bi-directional current waveform for a first actuator event and applying a second bi-directional current waveform for a second actuator event immediately subsequent to the first actuator event. The first bi-directional current waveform includes applying current in a first direction when the actuator is commanded to an actuated position and applying current in a reversed second direction when the actuator is commanded to a rest position. The second bi-directional current waveform includes applying current in the reversed second direction when the actuator is commanded to an actuated position and applying current in the first direction when the actuator is commanded to a rest position.

A control device of a fuel injection device improves stabilization in an opening operation of a valve element and stabilizes an injection amount. The control device includes a valve element to open a fuel passage by being separated from a valve seat, a movable iron core to perform an opening/closing operation of the valve element, and a fixed iron core to attract the movable iron core when a current flows to a coil. The control device includes a control unit which performs an intermediate energization in which the coil is energized again to attract the movable iron core to the fixed iron core and then the energizing to the coil is blocked and the movable iron core is displaced in a direction away from the fixed core. The control unit controls whether the intermediate energization is performed according to an injection interval of the fuel injection device.

Technical solutions are described for optimizing current injection profiles used for solenoid injectors, such as during fuel injection. An example fuel injector system includes a solenoid injector and a controller that receives a request for energizing the solenoid for an energizing time. The controller, in response to the requested energizing time exceeding a predetermined threshold, holds an electrical current applied to the solenoid injector at a predetermined minimum holding value for a holding phase. Further, the controller in response to the requested energizing time being less than the predetermined threshold, applies a predetermined peak-current value to the solenoid injector.

The method according to the invention calls upon a rotary electric machine (1) comprising a drive member (3) and a transmission member (4) of the belt or chain type, collaborating with the drive member and with the combustion engine (2) in order to start or restart the combustion engine, a tensioner (6) being provided to press against one strand (7) of the transmission member that extends between the rotary electric machine and the combustion engine. According to the invention, in a first stage, the rotary electric machine (1) supplies a predetermined reduced torque in the direction of starting for a predetermined duration in order to tension the transmission member (4) and then, in a second stage, the rotary electric machine (1) supplies a predetermined optimum torque for rapidly turning over the combustion engine (2) and causing it to start.

A control unit (2) for a fuel injector (3) comprising a solenoid actuator (31) having an armature (33), the control unit configured to drive a current through an electromagnet coil (34) of the solenoid actuator in a voltage mode during at least a portion of an injection cycle.

A method for determining a time at which a fuel injector, for an internal combustion engine of a motor vehicle, is in a predetermined opening state comprises applying a predetermined electrical voltage profile to the solenoid drive, detecting the temporal profile of the current strength of a current flowing through the coil of the solenoid drive, detecting the temporal profile of the voltage across the coil, determining a function based on the temporal profile of the current strength and the temporal profile of the voltage, wherein the function represents the interlinked magnetic flux or a temporal derivative of the interlinked magnetic flux in the solenoid drive, and determining the time as the time at which the function has a characteristic feature.

A method for determining a first time at which a fuel injector having a solenoid drive is in a first predetermined opening state. The method includes the following: (a) determining a second time at which the fuel injector is in a second predetermined state, (b) determining a stroke value of a moving component of the fuel injector, which stroke value corresponds to a movement path of the moving component which is covered when the fuel injector transitions between the first predetermined opening state and the second predetermined opening state, and (c) determining the first time at which the fuel injector is in the first predetermined opening state, on the basis of the second time and the stroke value. A method for actuating a fuel injector having a solenoid drive, an engine controller and a computer program.

An electromagnetic actuation system includes an electrical coil, a magnetic core, an armature, a controllable bi-directional drive circuit for selectively driving current through the coil in either of two directions, and a control module providing an actuator command to the drive circuit. Current is driven though the electrical coil in a first direction when an actuation is desired. When the actuation is not desired current is driven through the electrical coil including in a second direction sufficient to reduce residual flux within the actuator below a level passively attained within the actuator at zero coil current.

A method for actuating a fuel injector having a magnetic coil drive for an internal combustion engine of a motor vehicle is disclosed. The fuel injector has a first terminal and a second terminal, where the first terminal is connectable via a switch element to ground and the second terminal is connected to ground. The method includes the following: actuating the switch element to connect the first terminal to ground, acquiring a time curve of the current strength of a current flowing through the magnetic coil drive, and applying a voltage pulse to the magnetic coil drive to initiate an opening procedure of the fuel injection. A duration of the voltage pulse is established as a function of the acquired time curve of the current strength. Furthermore, an engine controller and a computer program are described.

The invention relates to a method for simulating malfunctioning solenoid valves for an internal combustion engine by influencing an activation time and a deactivation time of the solenoid valve. A current with a specified modifiable current strength flows through the solenoid valve in order to achieve an opening and closing process. The closing process is forced after the current supplied to the solenoid valve is activated at the activation time, and the opening process is forced after the current supplied to the solenoid valve is deactivated at the deactivation time. The current is applied with a charging current strength prior to the activation time for the duration of a charging phase, and after the activation time, the current is increased to peak current strength and subsequently reduced to a holding current strength. Furthermore, after the deactivation time, the current strength is reduced to a deactivation current strength, and after a delay, the current strength (I) increases again as a result of induction. A variation of the value and/or duration of the current strength and/or an application of an additional magnetic force is used to simulate a premature activation, a delayed activation, a premature deactivation, and/or a delayed deactivation.