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DE-102024210909-A1 - Method for controlling an electromagnetically operated gas injector of an internal combustion engine with a current profile, computing unit and computer program

DE102024210909A1DE 102024210909 A1DE102024210909 A1DE 102024210909A1DE-102024210909-A1

Abstract

The present invention relates to a method for controlling an electromagnetically operated gas injector (1) of an internal combustion engine with a current profile (I MV ), comprising reading at least one parameter of the current profile (I MV ) as a function of an operating point of the internal combustion engine from a storage unit in which different values for different operating points of the internal combustion engine are stored for the at least one parameter; calculating the current profile (I MV ) as a function of the read-out at least one parameter; and controlling the gas injector (1) with the current profile (I MV ).

Inventors

  • Michael Frank
  • David Lejsek

Assignees

  • Robert Bosch Gesellschaft mit beschränkter Haftung

Dates

Publication Date
20260513
Application Date
20241113

Claims (11)

  1. Method for controlling an electromagnetically operated gas injector (1) of an internal combustion engine with a current profile (I MV ), comprising the steps: reading at least one parameter of the current profile (I MV ) as a function of an operating point of the internal combustion engine from a storage unit in which different values for different operating points of the internal combustion engine are stored for the at least one parameter; calculating the current profile (I MV ) as a function of the read-out at least one parameter; and controlling the gas injector (1) with the current profile (I MV ).
  2. Procedure according to Claim 1 , wherein at least one parameter of the current profile (I MV ) is selected from a boost current (I BoostMin , I BoostMax ), a boost voltage (U Boost ), a boost duration (t Boost ), a holding current (I Hold-Min, I HoldMax ), a holding voltage (U Hold ) and/or a holding duration (t Hold ).
  3. Procedure according to Claim 2 , where the boost current (I BoostMin , I BoostMax ) and the hold current (I HoldMin , I HoldMax ) each include a maximum and a minimum value.
  4. Method according to one of the preceding claims, wherein the operating point parameter of the internal combustion engine is determined by a load and/or a speed of the internal combustion engine.
  5. Method according to one of the preceding claims, wherein the operating point of the internal combustion engine is determined by an injection start and/or an injection pressure of the gas injector (1).
  6. Method according to one of the preceding claims, further comprising: determining the at least one parameter of the current profile (I MV ) in a plurality of operating points of the internal combustion engine; storing the at least one parameter in the storage unit.
  7. Procedure according to Claim 6 , wherein at least one parameter of the current profile (I MV ) is determined at a specific operating point in such a way as to minimize wear of the gas injector.
  8. A computing unit configured to perform all process steps of a process according to any of the preceding claims.
  9. Arrangement consisting of a gas injector (1) of an internal combustion engine and a computing unit according to Claim 8 .
  10. Computer program that orders the computing unit according to the arrangement Claim 9 prompted to perform all procedural steps of a procedure according to one of the Claims 1 until 7 to be performed when it is executed on the computing unit.
  11. Machine-readable storage medium containing a computer program stored on it according to Claim 10 .

Description

The present invention relates to a method for controlling an electromagnetically operated gas injector of an internal combustion engine with a current profile, a computing unit and a computer program for carrying it out. Background of the invention Fuel injectors for introducing liquid or gaseous fuel into a cylinder of an internal combustion engine, which are actuated by an electromagnet, can be controlled or operated with a current profile whose parameters can be stored as a predetermined data set in an engine control unit. This data set can contain, in particular, information about the current's behavior over time in the electromagnet, which can be defined during the development of the fuel injector and kept constant throughout its entire service life. However, gaseous fuels, such as hydrogen or CNG (Compressed Natural Gas), differ from liquid fuels like gasoline or diesel in terms of viscosity and lubricating properties, which can lead to increased wear on gas injectors. Disclosure of the invention According to the invention, a method for controlling an electromagnetically operated gas injector of an internal combustion engine with a current profile, as well as a computing unit and a computer program for carrying out the method with the features of the independent claims, are proposed. Advantageous embodiments are the subject of the dependent claims and the following description. The invention utilizes the measure of making the current profile variable or parameterizable, so that the same current profile does not always have to be used during operation, but rather a more suitable current profile can be used depending on the operating point. It has been shown that gas injectors wear out particularly quickly when they are operated with a maximum current profile throughout their entire service life – as is common with liquid fuel injectors. The latter significantly determines the opening and closing conditions of a gas injector and thus has a major influence on its service life. The gas injector can be specifically configured to inject hydrogen and/or CNG directly into a cylinder of the internal combustion engine. However, the method described below can also be used for gas valves located in an intake port of the internal combustion engine. The invention makes it possible to represent an optimal current profile at all operating points of the engine, thereby reducing wear on the gas injector and extending its service life. For this purpose, current profile parameters can be determined depending on the operating point and stored in the processing unit, which can be, in particular, an engine control unit. This allows the solenoid coil of the gas injector to be energized as needed at each operating point, and a maximum load to be set only when required by engine operation. Specifically, at least one parameter of the current profile is read from a storage unit, which is in particular part of the executing processing unit, depending on an operating point of the internal combustion engine. The storage unit contains different values for this at least one parameter for different operating points of the internal combustion engine. Depending on the read-out at least one parameter, the current profile is calculated, and the gas injector is then controlled using this current profile. According to one embodiment, at least one parameter of the current profile is selected from a boost current, a boost voltage, a boost duration, a holding current, a holding voltage, and/or a holding duration. This allows the current profile to be influenced very variably, and these parameters can be easily controlled electrically by driving a power stage. The boost current is, in particular, a higher current than the holding current, required to open the gas injector. Specifically, the boost current can have a minimum and a maximum value, between which it can be regulated by a two-point control system. To provide the boost current, a boost voltage is required, which can be supplied by a DC/DC converter, in particular a boost converter, in the computing unit according to the invention. The boost duration refers to the period during which the solenoid coil of the gas injector is energized with the boost current. The boost duration can, for example, be in the range of up to a few microseconds. The holding current is, in particular, a current required to keep the gas injector open. Specifically, the holding current can be used to... The current also includes a minimum and a maximum value, between which it can be regulated using the two-point control. To provide the holding current, a holding voltage is required, which can correspond, for example, to the vehicle's battery voltage and take values in the range of 8 V to 16 V. Analogous to the boost duration, the holding duration refers to the period during which the gas injector's solenoid coil is energized with the holding current. The holding duration can, for example, be in the range of a few