A method for starting an engine is provided. The method comprises in response to an engine start request, cycling a gaseous fuel injector prior to activating a starter motor. In this way, delayed engine starts using gaseous fuel may be mitigated.

The purpose of the present invention is to provide a fuel injection valve control device with which variability in the injection amount with respect to drive pulse width can be kept to a satisfactory level in each of a plurality of fuel injection devices. The present invention provides a fuel injection valve control device for controlling a plurality of fuel injection devices each equipped with a valve body and a solenoid for opening the valve body, characterized in that the device is configured such that, a prescribed time after voltage has been applied to the solenoid, a holding current is applied, the prescribed time and the holding current being corrected for each of the fuel injection devices, on the basis of the operating characteristics of the fuel injection device.

The subject matter of this specification can be embodied in, among other things, a method that includes evaluating an analog electrical current waveform, determining a Boolean waveform based on the evaluated analog electrical current waveform, determining a collection of one or more first durations based on one or more on times identified from the Boolean waveform, determining a collection of one or more second durations based on one or more off times identified from the Boolean waveform, comparing the first durations and the second durations, determining, based on the comparing, an event based on the comparing, identifying a time at which the event occurred, and providing the time as a completion time.

In voltage boosting circuit for performing rapid power supply to a plurality of electromagnetic coils that drive fuel-injection electromagnetic valves, an overcurrent from vehicle battery is suppressed, and continuous noise is prevented from being produced. Each of rapid-power-supply voltage boosting capacitors that are connected in parallel with each other is charged from corresponding one of a pair of induction devices, which are asynchronously on/off-magnetized by first and second voltage boosting control circuits, by way of corresponding one of charging diodes in a pair; when addition value of exciting currents for induction devices in a pair continuously exceeds predetermined value, driving modes of one of and the other one of voltage boosting control circuits are set to large-current low-frequency mode and to small-current high-frequency mode, respectively, so that on/off timing of exciting current becomes irregular even when respective inductances values of induction devices in a pair are close to each other.

A fuel injection control device has a valve opening control portion which opens a control valve by electrically charging a piezoelectric element, and a valve closing portion which closes the control valve. The valve opening control portion includes a first rising control portion, a pause control portion and a second control portion. The first rising control portion increases a charge amount of the piezoelectric element during a first rising period. The pause control portion pauses an increase in the charge amount of the piezoelectric element during a pause period after the first rising period. The second rising control portion increases the charging amount of the piezoelectric elements again during a second rising period after the pause period. The pause period includes a period of immediately before the control valve is opened.

A method for controlling a current flowing through a consumer comprises the following steps, which are periodically traversed: determining a dither current based on a dither signal and a definite point in time, wherein the dither signal is determined by a frequency, an amplitude and a signal form and actuating a flow control valve to produce the sum of a target current and the determined dither current by the consumer. Furthermore, the method comprises determining an indication to the current flowing through the consumer; compensating the indication by the factor of the dither current; and providing the indication, wherein the determination of the dither current and the determination of the indication are synchronized with each other in a predetermined way.

A fuel pressure control device determines whether it is during a descending period of a plunger descending or an ascending period of the plunger ascending, and puts a first drive mechanism and a second drive mechanism in an energized state during the descending period and in a non-energized state during the ascending period, when there is a pressure reduction request to lower a fuel pressure in a high-pressure passage.

An injection control unit includes a constant-current control unit executing a constant current control to control a current of a coil to be in a predetermined current range lower than a peak current by allowing or interrupting a first voltage applied to the coil after the peak current starting to open an injector is applied to the coil driving the injector, and a high-voltage applying control unit applying a second voltage higher than the first voltage to the coil in a case where a condition that the current of the coil becomes lower than the predetermined current range is met when the constant-current control unit executes the constant current control.

An engine control system includes a fuel injector and a sensor that is configured to provide a signal indicative of a temperature. A controller is in communication with the sensor. The controller includes a fuel injector driver in communication with the fuel injector. The fuel injector driver includes a saturated mode and a peak and hold mode. The controller is configured to command the fuel injector driver to control the fuel injector with one of the saturated mode or the peak and hold mode based upon the signal. For a high resistance injector, the peak and hold mode is used in cold weather conditions to break free an injector seal, and then the fuel injector driver reverts to the saturated mode.

A valve control device controls an actuator for operating a valve based on a signal indicating a degree of opening of the valve and a signal indicating starting of an engine for which the valve. The valve control device includes a fully closed learning processing unit configured to learn a seated position at which a valve body is seated on a valve seat whenever the engine is started on the basis of the startup signal and the degree-of-opening signal, and a target value setting unit configured to set a soft-landing initiation position when the valve body is seated based on the seated position and set a target value with the valve body is decelerated from the soft-landing initiation position, and the valve body is seated at a predetermined seating speed. A control driving unit is configured to generate a drive signal based on the target value and the degree-of-opening signal.