Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
  • H01T13/00—Sparking plugs
  • H01T13/40—Sparking plugs structurally combined with other devices
  • H01T13/41—Sparking plugs structurally combined with other devices with interference suppressing or shielding means
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
  • H01T13/00—Sparking plugs
  • H01T13/02—Details
  • H01T13/04—Means providing electrical connection to sparking plugs
  • H01T13/05—Means providing electrical connection to sparking plugs combined with interference suppressing or shielding means
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
  • H01T13/00—Sparking plugs
  • H01T13/02—Details
  • H01T13/04—Means providing electrical connection to sparking plugs

Definitions

• Ignition device and circuit device for igniting a fuel mixture, over-traction nasal element for transmitting an ignition signal.
• the invention relates to a device for igniting a fuel mixture, in particular a fuel-air mixture, with an ignition system for generating a high-voltage ignition voltage and with a spark plug arranged in an engine block and a transmission element for transmitting the ignition voltage to the spark plug.
• the invention also relates to a transmission element for transmitting an ignition signal from an ignition system to a spark plug, comprising a contact element.
• the invention further relates to an ignition device for generating an ignition signal. Furthermore, the invention also relates to a circuit device.
• Devices for igniting a fuel mixture, in particular a fuel-air mixture, in various designs are known from the prior art.
• the aim is to further improve the combustion process in the combustion chamber of the engine, in particular an internal combustion engine with spark ignition by spark plugs, also known as a gasoline engine.
• the fuel-air mixture introduced into the combustion chamber or a cylinder is usually compressed by a piston moving in the combustion chamber. Shortly before reaching a top dead center, a spark from a spark plug ignites the fuel-air mixture.
• an ignition system or an ignition coil transforms the battery voltage of a vehicle to the desired ignition voltage in order to provide an ignition signal or an ignition voltage, in particular a high-voltage ignition voltage.
• a transmission element which may have a suitable contact element for this purpose, the ignition voltage is then applied to the spark plug or the ignition signal is transmitted to the spark plug.
• the contact element is usually designed as an ignition line, in particular as a high-voltage conductor.
• the ignition voltage is usually applied via a connecting bolt, which is insulated from the outside, for example by a candle insulator, in order to provide the ignition voltage on a so-called center electrode.
• the ignition spark then jumps from the center electrode to a ground electrode and thereby overcomes the spark gap or the distance between the two electrodes.
• the ground electrode is generally electrically conductive, usually via a thread, connected to the engine block or the cylinder head.
• the contact element for example the high-voltage conductor, which transmits the high-voltage ignition voltage from the ignition system to the spark plug, is usually guided by an insulation element which surrounds or surrounds the high-voltage conductor on the outside.
• DE 20 2012 004 602 U1 which describes a high-frequency plasma ignition device for an internal combustion engine, in particular for igniting a fuel-air mixture in a combustion chamber of an internal combustion engine using a series oscillating circuit.
• the present invention has for its object to further improve a device for igniting a fuel mixture with an ignition system for generating a high-voltage ignition voltage and a spark plug arranged in a motor block in order to further optimize the combustion process, in particular in a gasoline engine.
• the present invention is also based on the object of providing an improved transmission element for transmitting an ignition signal from an ignition system to a spark plug.
• the present invention has for its object to provide a circuit device which makes it possible to further improve the ignition of a fuel mixture in a combustion chamber of an internal combustion engine in order to further optimize the combustion process, in particular in a gasoline engine.
• the object is achieved with respect to the device for igniting a fuel mixture, in particular egg nes fuel-air mixture, by the features of claim 1.
• the object is achieved with respect to the transmission element to be created by the features of claim 15. Furthermore, the object is achieved with regard to the ignition device to be created for generating a high-voltage ignition signal by the features of claim 24 and with regard to the circuit device to be created by the features of claim 25.
• the device for igniting a fuel mixture in particular a fuel-air mixture, an ignition system for generating a high-voltage ignition voltage and a circuit device comprising a circuit for superimposing the high-voltage ignition voltage with a high-frequency signal.
• the device further comprises a spark plug arranged in an engine block and a transmission element for transmitting the high-voltage ignition voltage superimposed with the high-frequency signal to the spark plug.
• the spark plug is preferably located in a shaft within the metallic engine block.
• the device can optionally also have a plurality of spark plugs and, accordingly, a plurality of transmission elements.
• the high-voltage ignition voltage generated by the ignition system is superimposed with a high-frequency signal.
• the high frequency signal can be generated by a high frequency generator.
• High-frequency generators for generating a high-frequency signal are generally known from the prior art.
• the high-frequency signal can be generated in the context of the invention by the circuit device, but also externally, and transmitted to the circuit device, in particular to the circuit of the circuit device.
• the high-voltage ignition voltage or the high-voltage pulse (hereinafter also referred to as the HV signal) and the superimposed high-frequency signal (hereinafter also referred to as the RF signal) can be generated in a common circuit device.
• the high-voltage ignition voltage and / or the high-frequency signal separately and to supply the circuit device or to superimpose the high-voltage ignition voltage in the circuit device with the high-frequency signal.
• the coupling or the superimposition of the high-voltage ignition voltage can be done with basically known methods.
• the high-voltage ignition voltage can preferably be generated with the aid of an ignition coil.
• the ignition coil and the means for coupling a high-frequency signal into the high-voltage ignition voltage can be designed as parts of the circuit device.
• the high-voltage ignition voltage can also be generated outside the circuit device and transmitted to the circuit device, for example, by means of a cable or a (high-voltage) lead.
• the device In order to be able to carry out the combustion process by igniting the fuel mixture by means of the high-voltage ignition voltage and the superimposed high-frequency signal, the device has the transmission element already mentioned.
• the transmission element has a contact element which is provided with an electrically conductive coating at least along a section of its longitudinal axis, the impedance of the coating being lower than the impedance of the contact element.
• Impedance is also called AC resistance and is an electrical resistance in AC technology. Impedance is a physical quantity to describe the property of a line in electromagnetic wave propagation. The impedance is a summary of the following two statements. It indicates the ratio of the amplitudes of sinusoidal alternating voltage to sinusoidal alternating current. It also specifies the shift in the phase angle between these two quantities.
• the transmission element has a contact element, which is provided at least along a portion of its longitudinal axis, preferably completely, with a coating of an electrically conductive material with the property mentioned, the transmission of the high-voltage ignition voltage superimposed with the high-frequency signal is optimized.
• the lower impedance of the coating compared to the contact element results from the fact that the magnetic permeability of the coating is lower than the magnetic permeability of the contact element and / or the electrical conductivity of the coating is higher than the electrical conductivity of the contact element ,
• the contact element can have a high electrical conductivity and a low permeability and thus a low impedance.
• the contact resistance and the DC conductivity are thus improved.
• the device according to the invention enables an optimized transmission of the high-voltage signal and at the same time the high-frequency signal.
• the coating provided according to the invention which has a lower impedance than the contact element itself, enables optimized transmission of the high-frequency signal, while the contact element advantageously serves for the transmission of the high-voltage signal or the high-voltage voltage.
• the transmission element according to the invention thus optimizes the transmission of both signals.
• the coating preferably has both a permeability that is lower than the permeability of the contact element and an electrical conductivity that is higher than the electrical conductivity of the contact element.
• the fact that the coating has the two properties mentioned results in an advantageous manner that the coating also has a lower impedance than the contact element.
• the coating according to the invention can preferably be formed by using a material, in particular a metal, for the coating, which has the properties mentioned. It is also possible to assemble the coating, as will be explained in more detail below, from a plurality of different materials, preferably one above the other, so that overall there is a coating with the impedance according to the invention or the desired properties. In the context of the invention, it may already be sufficient if a layer of the coating has a lower impedance than the contact element. However, the coating as a whole, even if it is formed from a plurality of materials or layers, preferably has an impedance that is lower than the impedance of the contact element.
• the transmission of the high-voltage ignition voltage superimposed with the high-frequency signal can take place completely or essentially via the coating made of the electrically conductive material. It is an advantage if the contact element itself also contributes to the transmission. The inventors knew that it is particularly advantageous if the transmission of the high-frequency signal takes place at least essentially, preferably completely, via the coating. It is also advantageous if the high-voltage ignition voltage is applied to the largest possible line cross-section, i. H. that the high-voltage ignition voltage or the high-voltage signal is transmitted over the largest possible line cross-section, for which purpose it is advantageous if the contact element is used for the transmission.
• the high-frequency signal is thus preferably transmitted at least essentially via the coating and the high-voltage ignition voltage at least essentially via the contact element.
• the contact element itself can thus have a structure that does not have to be optimized for high-frequency signal transmission.
• the contact element is preferably constructed in such a way that it enables robust contacting at its ends, in particular for establishing a connection between the ignition system, for example an ignition coil and the spark plug.
• the contact element is preferably designed such that it has an offset between the ignition system and the Can compensate for the spark plug.
• the contact element is preferably designed to transmit the high-voltage signal.
• the magnetic permeability of the coating is lower than the magnetic permeability of steel and / or that the electrical conductivity of the coating is higher than that of stainless steel, preferably higher than the electrical conductivity of iron.
• the magnetic permeability or permeability number m G of the coating can be less than 1000, preferably less than 100, and particularly preferably less than 10 and very particularly preferably less than 1.
• the electrical conductivity (s) of the coating is higher than the electrical conductivity of iron.
• the electrical conductivity of the coating is preferably at least 1.4 ⁇ 10 6 Siemens per meter (S / m).
• the electrical conductivity of the coating is particularly preferably at least 10 x 10 6 Siemens per meter (S / m) and very particularly preferably at least 19 x 10 6 Siemens per meter (S / m), in particular at least 37 x 10 6 Siemens per Meters (S / m).
• a contact element with a coating having the aforementioned electrical conductivity and / or the aforementioned permeability is particularly suitable for fulfilling the task according to the invention, in particular for transmitting a high-voltage ignition voltage superimposed with a high-frequency signal.
• the coating has several layers.
• the coating By forming the coating from several layers, different properties of the materials that form the individual layers of the coating can be combined. It can be provided that if the coating is formed from several layers, at least two layers are made from a different material. Preferably two layers are provided, which consist of two different materials. The coating is particularly preferably formed from three layers which consist of two or preferably three different materials. According to the invention, it can also be provided that the coating has more than three layers, which are composed of two, three or more materials.
• the coating has a layer structure, it can preferably have at least a first layer made of a first material, a second layer made of a second material and preferably a third layer made of a third material and optionally a fourth or further layer made of different materials exhibit. It has turned out to be particularly suitable if a layer is first applied to the contact element, which layer adheres to the contact element, particularly if it is made of iron or steel, in a particularly advantageous manner. A copper layer can be particularly suitable for this. To form the second layer, it can be advantageous if it fulfills the function of a diffusion barrier, ie it is designed as a diffusion layer. A nickel layer can be particularly suitable for this.
• the third layer can preferably be formed from a material which, in addition to the impedance according to the invention, also has the property of being as corrosion-resistant as possible. A gold layer, a silver layer or a tin layer can be particularly suitable for this.
• the materials which form the individual layers are preferably chosen such that the coating composed of the layers overall has a lower impedance than the contact element and, preferably, the magnetic permeability of the coating is lower overall than the magnetic permeability of the contact element and the electrical conductivity of the coating is generally greater than the electrical conductivity of the contact element.
• the coating as a whole preferably fulfills the properties mentioned and preferably the materials from which the individual layers are formed also each individually meet the properties mentioned.
• the coating is preferably made of metal.
• the coating is formed from a plurality of layers, it is preferably provided that at least one, two, three, more or all of the layers of the coating are formed from metal or metals.
• the coating or at least one, two, three, several or all layers of the coating made of silver, copper, gold, tin, aluminum, tungsten, molybdenum, titanium, zirconium, niobium um, tantalum, bismuth, palladium, lead, an alloy, mainly comprising one or more of these materials or a composite of one of these materials.
• the aforementioned materials are particularly suitable because they both have an electrical conductivity that is significantly greater than the electrical conductivity of stainless steel, and also the magnetic permeability of the material is lower than the magnetic permeability of steel.
• the coating has a thickness of 1.0 ⁇ m to 30 ⁇ m, preferably 2.0 ⁇ m to 25 ⁇ m, more preferably 3.0 ⁇ m to 25 ⁇ m and very particularly preferably 4.0 ⁇ m to 25 ⁇ m.
• the thickness or the thickness of the coating may depend on the frequency provided for the high frequency signal.
• the aforementioned values have been found to be particularly suitable for the transmission of a high-voltage ignition voltage superimposed with a high-frequency signal, since this results in the so-called skin effect, ie. H. the effect that in electrical conductors through which high-frequency alternating current flows, the current density inside the conductor is lower than the losses resulting in the outer region are minimized. This is possible because the coating has a lower impedance than the contact element.
• the contact element is made of metal, preferably steel or stainless steel. Forming the contact element from brass, copper beryllium or a bronze alloy is also particularly suitable.
• Forming the contact element from metal preferably from steel or stainless steel, has proven to be particularly suitable.
• metal preferably from steel or stainless steel.
• Such a design of the contact element enables ro bustte contacting of the spark plug or the ignition system.
• a contact element made of metal can be coated easily and reliably with the electrically conductive material.
• a training of a contact element made of steel or stainless steel is particularly suitable.
• the electrically conductive coating is selected from a material whose magnetic permeability is less than the magnetic permeability of the contact element and at the same time the electrical conductivity of the material is higher than the electrical conductivity of the contact element.
• the aforementioned preferably provided materials in particular copper, silver, gold or tin, are particularly suitable for this.
• the materials preferably provided for the coating, in particular copper, silver, gold or tin have an electrical conductivity that is higher than the electrical conductivity of steel or stainless steel. In addition, these materials have a magnetic permeability that is lower than that of steel or stainless steel.
• the contact element can also be formed from a non-metallic material.
• the contact element is completely covered with the coating on the outside from a first end to a second end.
• the coating is set back somewhat at the first and / or at the second end, preferably in such a way that at least 90%, preferably 95%, of the central part of the contact element is provided with the coating.
• the contact element is preferably provided with the coating over its entire (axial) length.
• An offset of the coating relative to the contact element can possibly be of primary advantage in order to enable a suitable fastening of the contact element. It is advantageous if the coating or a high-voltage conductor connected to the coating extends to the spark plug in order to establish an electrically conductive connection with the ignition system or a high-voltage conductor connected to the ignition system directly via the spark plug.
• the contact element is designed as a high-voltage conductor.
• the contact element is designed at least in sections as a contact spring, preferably as a spiral spring.
• An embodiment of the contact element at least in sections or partially as a contact spring has the advantage that the high-voltage ignition voltage with the superimposed high-frequency signal can be transmitted partially and reliably, particularly before.
• the elasticity of the electrically conductive spring can compensate for manufacturing tolerances in the longitudinal direction of the spring.
• the contact spring can also compensate un different angles of an angled shaft in the engine block, into which the contact is introduced as part of the transmission element.
• the use of a contact spring is also suitable if the shaft into which the contact spring is accommodated within the engine block is not angled.
• An angular course of the shaft in the engine block is basically optional, but can be particularly suitable.
• the contact spring as a carrier of the coating made of the electrically conductive material thus enables the coating to reliably transmit the high-voltage voltage superimposed with the high-frequency signal even when manufacturing tolerances in the longitudinal direction or an angular course of a shaft have to be compensated for.
• the contact element can be configured in sections, but preferably completely, as a contact spring. It has proven to be advantageous if at least 90%, preferably 95%, of the middle part of the contact element is designed as a contact spring. An incomplete formation of the contact element as a contact spring may be suitable, in order to enable a suitable fastening of the contact element, in particular in the region of the ends of the contact element.
• the contact spring is preferably designed and arranged in such a way that it presses against a suitable coupling unit of the spark plug and an electrically conductive connection with the spark plug is established via the coating.
• the contact element is formed at least in sections from a resilient material and / or at least in sections as a spring arm.
• the contact element can also be formed entirely as a spring arm or from a resilient material. It is also conceivable that the contact element is designed in sections as a spring arm or made of a resilient material and in sections as a contact spring.
• a design of the contact element as a spring arm or from a resilient material makes it possible to compensate for tolerances and to take into account an angular course of the shaft in an engine block.
• the transmission element has an insulation element which surrounds the contact element.
• the contact element in particular in one embodiment as a contact spring, is preferably received or guided in a bore of the insulation element.
• the insulation element preferably has a sealing function.
• the insulation element is preferably made of rubber or a rubber-like material.
• the insulating element made of rubber or a rubber-like material and the training of the contact element as a spring lead in a particularly advantageous manner that manufacturing problems and angular deviations can be compensated for.
• the transmission element thus formed is particularly elastic or has an elasticity that is advantageous for the intended purpose.
• the insulation element can also advantageously perform the task of electrical insulation between the coating of the contact element and the motor block or the circuit housing.
• the insulation element is preferably in the form of a jacket which surrounds the electrically conductive coating of the contact element in close contact or at a distance, for example in such a way that a tubular passage is formed in the jacket.
• a jacket which surrounds the electrically conductive coating of the contact element in close contact or at a distance, for example in such a way that a tubular passage is formed in the jacket.
• the configuration is particularly suitable if the contact element is designed as a contact spring.
• the configuration according to the invention makes it possible to transmit the high-voltage ignition voltage superimposed with the high-frequency signal to the spark plug, in particular a central electrode of the spark plug, via the contact element provided with the electrically conductive coating, while the ground electrode, in a particularly advantageous manner - as shown below - Spark plug, to which the spark jumps from the center electrode, is connected to the ground potential of the circuit device, in particular the circuit housing and the circuit.
• This configuration enables the prior use of a high-voltage ignition voltage with a superimposed high-frequency signal in order to optimize the combustion process in a combustion chamber.
• an electrically conductive shielding element which surrounds the contact element at least along a portion of its longitudinal axis in an electromagnetically shielding manner, the shielding element being electrically conductively connected to a ground potential of the circuit device and the shielding element providing a connection between the ground potential of the circuit device and a ground electrode of the spark plug.
• the circuit device comprises a circuit housing which electromagnetically shields the circuit, the shielding element being connected to a ground potential of the circuit housing and / or to a ground potential of the circuit.
• the combustion process in a gasoline engine can be injected particularly advantageously by a high-voltage ignition voltage superimposed with a high-frequency signal
• From the shielding element also takes over the shielding of the ignition signal consisting of the high-voltage ignition voltage and the superimposed high-frequency signal against external interference.
• the combustion process is also optimized by the fact that the ground potential of the circuit device and the ground electrode of the spark plug are electrically connected to one another.
• ground potential is also referred to simply as "ground”. It is advantageous if the shielding element establishes equipotential bonding between the ground electrode of the spark plug and the circuit device.
• the shielding element prevents or reduces both electromagnetic radiation from the electrically conductive coating and electromagnetic radiation into the electrically conductive coating.
• the shielding element in conjunction with the coating of the contact element according to the invention enables good electromagnetic compatibility (EMC), which leads to the fact that an optimized combustion by a high-voltage ignition voltage with a superimposed high-frequency signal is possible.
• the shielding element comprises the contact element provided with the coating, at least along a section of its longitudinal axis, preferably completely.
• the shielding element has expansion joints, recesses, gaps, incisions or notches in order to move the contact element or the transmission element into a radial and / or to enable axial direction, in particular for tolerance compensation.
• the shielding element comprises the insulation element on the outside at least along a section of its longitudinal axis.
• the shielding element is preferably designed such that it encompasses the electrically conductive coating of the contact element in that the shielding element surrounds or sheathes the insulation element, which receives the electrically conductive coating of the contact element, on the outside.
• the shielding element can be designed as described above to ensure radial mobility. Preferably, however, the shielding element surrounds or completely encloses the isolating element along the axial section.
• the circuit device preferably comprises a circuit housing which receives the circuit and electromagnetic, i. H. shielded electrically and / or magnetically, the high-voltage ignition voltage superimposed with the high-frequency signal is shielded in a particularly suitable manner within the circuit device.
• the shielding element is connected to a ground potential of the housing and / or a ground potential of the circuit. It is particularly preferable if the ground potential of the circuit is connected to the ground potential of the circuit housing. Furthermore, it is preferable, in particular for this embodiment, that the shielding element is connected to the ground potential of the circuit housing.
• the circuit housing can preferably have a through hole in which the shielding element is inserted.
• the shielding element and / or the insulation element is preferably formed as part of the transmission element.
• the shielding element extends to the engine block in order to establish an electrical connection between the ground potential of the circuit device, in particular the circuit housing and the circuit, and the ground electrode of the spark plug via the engine block.
• the shielding element comprises only a portion of the longitudinal axis of the shielding element.
• the axial section preferably begins at a first end of the insulation element, which is preferably connected to the circuit housing, and extends in the direction of the second end of the insulation element, preferably in such a way that an electrical connection is established between the ground potential of the circuit housing and the motor block ,
• the shielding element starting from a first end of the insulation element, comprises only a portion of the longitudinal axis of the insulation element on the outside, a ground conductor being continued up to a second end of the insulation element facing the spark plug ,
• This solution has the advantage that, on the one hand, good shielding, in particular shielding for improving the EMC, is provided in the area between the circuit device, in particular a circuit housing, and the engine block, but the connection between the ground potential of the circuit device and the ground electrode is not depends on the engine block. In this case, the ground line, which is continued to a second end of the insulation element facing the spark plug, can provide the electrical connection.
• the engine block itself does not necessarily have to be connected to the spark plug. This increases the design freedom when designing the shaft provided for the spark plug in the engine block.
• the shielding element comprises the insulation element on the outside from a first end to the second end. If necessary, it can be provided that the shielding element at the first and / or at the second end is set back slightly relative to the insulation element, preferably in such a way that at least 90%, preferably 95%, of the central part of the insulation element is surrounded by the shielding element. In this embodiment, however, the insulation element is preferably Surrounded by the shielding element over its entire (axial) length. An offset of the shielding element from the insulation element can primarily be advantageous in order to enable a suitable fastening of the transmission element or not to impair the sealing function of the insulation element.
• the shielding element or a ground conductor connected to the shielding element extends to the spark plug in order to establish an electrically conductive connection between the circuit device, in particular the circuit housing and the circuit, and the ground electrode of the spark plug directly via the spark plug.
• connection of the ground electrode to the circuit device, in particular a circuit housing, is thus possible independently of the engine block.
• the shielding element is at least partially formed by a metallization of the insulation element.
• Metallization is particularly suitable for realizing an electrically conductive connection for potential equalization and also for shielding.
• the invention also relates to a transmission element for transmitting an ignition signal from an ignition system to a spark plug, comprising a contact element, the contact element being provided with an electrically conductive coating at least along a section of its longitudinal axis, the impedance of the coating being lower than the impedance of the contact element and wherein the contact element is formed at least in sections as a contact spring and / or as a spring arm and / or from a fe-reducing material.
• the lower impedance of the coating compared to the contact element results from the fact that the magnetic permeability of the coating is lower than the magnetic permeability of the contact element and / or the electrical conductivity of the coating is higher than the electrical conductivity of the contact element ,
• the magnetic permeability of the coating is lower than the magnetic permeability of steel and / or that the electrical conductivity of the coating is higher than that of stainless steel, preferably higher than the electrical conductivity of egg sen.
• the electrical conductivity of the material of the coating is higher than the electrical conductivity of egg sen.
• the electrical conductivity (s) of the material of the coating is at least 1.4 ⁇ 10 6 Siemens per meter (S / m), preferably 10 ⁇ 10 6 Siemens per meter (S / m).
• the coating has several layers.
• the coating is made of metal or at least one, two, three, several or all layers of the coating are made of metal or metals.
• the coating or at least one, two, three, several or all layers of the coating is preferably made of silver, copper, gold, tin, aluminum, tungsten, molybdenum, titanium, zirconium, niobium, tantalum, bismuth, palladium, lead, an alloy, mainly comprising one or more of these materials or a composite of one of these materials.
• the coating preferably has a thickness of 1.0 ⁇ m to 30 ⁇ m, preferably 2.0 ⁇ m to 25 ⁇ m, more preferably 3.0 ⁇ m to 25 ⁇ m and very particularly preferably 4.0 ⁇ m to 25 ⁇ m.
• the contact element is made of metal, preferably steel or stainless steel.
• any other material is basically suitable for the formation of the contact element, since it can be sufficient within the scope of the invention if the ignition signal is transmitted via the electrically conductive coating.
• the transmission element has an insulation element which surrounds the contact element provided with the coating.
• the transmission element has an electrically conductive shielding element which surrounds the insulation element on the outside at least along a portion of its longitudinal axis.
• the transmission element according to the invention is suitable for the transmission of any ignition signal.
• the ignition signal can be both a high-voltage ignition voltage (HV signal) and a high-frequency signal, in particular a high-frequency plasma ignition device.
• the transmission element is particularly suitable for transmitting a high-voltage ignition voltage, which is superimposed with a high-frequency signal.
• a circuit device can be provided which comprises a circuit for superimposing a high-voltage ignition voltage with a high-frequency signal, which is then generated with the aid of the transmission element, in particular the coating of the contact telements of the transmission element to which the spark plug is transmitted.
• the Zündsig signal to be transmitted is thus preferably a high-voltage ignition voltage, which is superimposed with a high-frequency signal, preferably such as has already been performed with respect to the device according to the invention.
• the invention also relates to an ignition device with an ignition system for generating an ignition signal and with a transmission element for transmitting the ignition signal to a spark plug.
• the transmission element can be designed in one configuration and with the variants that are described above and described below in order to transmit the ignition signal.
• the ignition signal can be a high-voltage ignition voltage (HV signal) or a high-frequency signal (HF signal).
• the ignition signal is preferably a high-voltage ignition voltage which is superimposed with a high-frequency signal, preferably such as has already been carried out with respect to the device according to the invention.
• the invention further relates to a circuit device for superimposing a high-voltage ignition voltage with a high-frequency signal, and with a transmission element for transmitting the high-voltage ignition voltage superimposed with the high-frequency signal to the spark plug.
• FIG. 1 is an illustration of the device according to the invention with a sectional view of a
• FIG. 2 shows a basic side view of a contact element designed as a contact spring
• Fig. 4 shows a cross section through a turn of the contact spring, the coating of three
• an internal combustion engine in particular an internal combustion engine of a motor vehicle and the associated device for igniting a fuel-air mixture in a combustion chamber, in particular a cylinder of the engine, are sufficiently known from the general prior art.
• combustion engines with spark ignition by spark plugs so-called gasoline engines, are also known, in particular also with direct injection.
• the exemplary embodiment is described on the basis of the transmission of a high-voltage ignition voltage (HV signal or HV pulse), which is superimposed with a high-frequency signal.
• the overlay element according to the invention is also suitable for transmitting another ignition signal, for example based on a high-voltage ignition voltage or a high-frequency signal.
• the transmission element according to the invention is not limited to the transmission of a specific ignition signal, but is particularly suitable for the transmission of a high-voltage ignition voltage which is superimposed on a high-frequency signal.
• the Zündeinrich device shown in the embodiment is not limited to the generation of a high-voltage ignition voltage, which is superimposed with a high-frequency signal.
• the ignition signal generated by the ignition device can be an arbitrary ignition signal, as already explained with regard to the transmission element.
• the device shown in Figure 1 shows a particularly suitable structure.
• the use of the transmission element is not limited to a specific structure of a device for igniting a fuel mixture, but can be used in any structure.
• the exemplary embodiment is therefore also isolated as a disclosure of a transmission element, without being restricted to the features of the illustrated device for igniting a fuel mixture, the use of the transmission element for the illustrated device being particularly suitable.
• FIG. 1 shows a device for igniting a fuel mixture, in particular a fuel-air mixture, with an ignition system 1, shown only in principle, for generating a high-voltage ignition voltage (HV pulse) and a circuit device 2.
• HV pulse high-voltage ignition voltage
• the circuit device 2 comprises a circuit housing 3 and a switching device 4 for superimposing the high-voltage ignition voltage with a high-frequency signal (HF signal).
• the high-frequency signal is generated by means of a high-frequency generator 5.
• the high-frequency signal generated by the high-frequency generator 5 is conducted via a high-frequency line 5a to the circuit 4.
• the high-voltage ignition voltage generated by the ignition system 1 is also fed to the circuit 4 via a high-voltage supply line 1a.
• the ignition system 1 and / or the high-frequency generator 5 and / or another device for generating the high-voltage ignition voltage or the high-frequency signal can also be integrated in the circuit device 2, in particular in the circuit housing 3 and optionally also in the circuit 4 ,
• the generation of the high-voltage ignition voltage or a corresponding high-voltage pulse and the high-frequency signal can basically take place in any known manner within the scope of the invention.
• a transmission element 6 is also provided which has a contact element 7 which is guided in an insulation element 8.
• the transmission element 6 extends to a spark plug 10 arranged in an engine block 9.
• the spark plug 10 can have any structure suitable for igniting a fuel-air mixture.
• the spark plug 10 in the exemplary embodiment has a metallic connecting part 11, a ceramic part 12, a flange 13 with an integrated crimp ring for holding the ceramic part 12, a screw thread 14, a central electrode 15 and one Ground electrode 16 on.
• the construction of the spark plug 10 can also deviate, in particular, instead of a central electrode 15 insulated by means of a ceramic part 12, another insulation can also be provided.
• spark plugs and the different variants are known from the prior art.
• the spark plug 10 is located in a shaft of the engine block 9.
• the shaft in the engine block 9 does not have to run at an angle, as shown in the exemplary embodiment, but can have any course, possibly also a non-angled course.
• the spark plug 10 is connected to the engine block 9 in an electrically conductive manner via the screw thread 14.
• the circuit housing 3 is designed to be electrically conductive, so that the circuit 4 is shielded electromagnetically.
• the circuit 4 can be connected to the circuit housing 3 via a ground line 17, so that the circuit housing 3 and the circuit 4 have the same ground potential.
• the contact element as shown in more detail in FIG. 2, is designed as a contact spring 7, preferably as a spiral spring.
• the exemplary embodiment is not restricted to this.
• the formation of the contact element as a contact spring 7 is particularly suitable, in particular to compensate for tolerances.
• the contact element 7 can optionally also be designed such that it is designed as a spring only over a portion of its longitudinal axis A or (axial) length.
• the insulation element 8 encompasses or encases the contact spring 7. This can preferably be achieved in that the insulation element 8 has a central bore for receiving the contact spring 7.
• the insulation element 8 can be formed as part of the transmission element 6.
• the insulation element 8 is preferably made of rubber or a rubber-like material, but the exemplary embodiment is not restricted to this.
• the insulation element 8 also fulfills the function of a sealing part or takes over a sealing function.
• the insulation element 8 seals both the transition to the circuit housing 3 and the transition region to the engine block 9, so that no moisture can penetrate.
• the insulation element 8 can be used accordingly be designed, preferably grooves, for example for positive reception, a wall of the circuit housing 3 and / or annular extensions, as shown in principle in Figure 1.
• an electrically conductive shielding element 18 is also (optionally) provided or formed.
• the shielding element 18 comprises and shields the contact spring 7 at least along a section of the longitudinal axis A of the contact spring 7.
• the shielding element 18 can be formed as part of the transmission element 6.
• the shielding element 18 comprises the contact spring 7 only electromagnetically shielding over part of its axial length or the longitudinal axis A.
• the shielding element 18 is preferably designed such that the shielding element 18 comprises the contact spring 7 to such an extent that the distance d between the circuit housing 3 and the motor block 9 is shielded.
• the shielding element 18 comprises the contact spring 7 outside the circuit housing 3 up to the spark plug 10. That is, the contact spring 7 is encompassed by the shielding element 18 almost over the entire length of the circuit housing.
• the shielding element 18 is electrically conductively connected to a ground or to the ground potential of the circuit device 2.
• the shielding element 18 establishes a connection between the ground of the circuit device 2 and the ground electrode 16 of the spark plug 10.
• the shielding element is electrically conductively connected to the circuit housing 3 of the circuit device 2.
• the circuit housing 3 is connected via the ground line 17, as already described, to the circuit 4, so that the circuit 4, the Wegungsgefeldu se 3 and the shielding element 18 have the same ground or the same ground potential.
• the shielding element 18 is designed such that it comprises the insulation element 8 on the outside at least along a section of its longitudinal axis A.
• FIG. 1 shows that the shielding element 18 comprises the insulation element 8 over a section of its longitudinal axis A. As already described, the contact spring 7 is accordingly encompassed and shielded by the shielding element 18.
• the shielding element 18 extends as far as the engine block 9 in order to establish an electrical connection between the ground of the circuitry and the engine block 9. to produce direction 2 and the ground electrode 16.
• the shielding element 18 can extend to the spark plug 10 in order to establish an electrically conductive connection with the ground electrode 16 of the spark plug 10 directly via the spark plug 10.
• the shielding element 18 is preferably connected to the crimp ring 13 and this in turn is connected to the ground electrode 16 via the screw thread 14.
• circuit housing 3 on the motor block 9 is fixed.
• the area of the engine block 9 on which the circuit housing 3 is fixed can be a cylinder head of the cylinder in which the spark plug 10 is inserted.
• a mounting 19 for fixing the circuit housing 3 is shown in principle in Figure 1.
• the contact element 7 has a coating 20 made of an electrically conductive material at least along a section of its axial length A is provided.
• the electrically conductive material for forming the coating 20 is chosen such that the impedance of the coating 20 is lower than the impedance of the contact element 7.
• the lower impedance of the coating 20 results from the fact that the magnetic permeability of the Be coating 20 is less than the magnetic permeability of the contact element 7 and / or the electrical conductivity of the coating 20 is higher than the electrical conductivity of the contact element 7.
• the magnetic permeability of the coating 20 is lower than the magnetic permeability of steel and that the electrical conductivity of the coating 20 is higher than that of stainless steel.
• FIG. 2 shows a correspondingly coated contact element in a preferred embodiment as a contact spring 7 with the coating 20 applied on the outside.
• Figure 3 shows the cross section through a turn of the contact spring 7.
• the material of the coating 20 is selected in the exemplary embodiment such that the electrical conductivity of the material is higher than the electrical conductivity of iron.
• the electrical conductivity s of the material of the coating 20 in the exemplary embodiment is at least 1.4 ⁇ 10 6 Siemens per meter (S / m), preferably 10 ⁇ 10 6 Siemens per meter (S / m).
• the coating 20 is formed from metal in the exemplary embodiment.
• the transmission element 6 can only be composed of the contact element 7, in particular formed as a contact spring, and the coating 20.
• the transmission element 6 can also have the insulation element 8 and / or the shielding element 18 or can be composed of these four components.
• the coating 20 is formed from copper, silver, gold or tin.
• the coating 20 has a thickness of 1.0 pm to 30 pm, preferably 2.0 pm to 25 pm, more preferably 3.0 pm to 25 pm and very particularly preferably 4.0 pm to 25 pm.
• the contact spring 7 is made of metal, preferably steel or stainless steel.
• the coating 20 is formed from a material which has a lower permeability than the material from which the contact element 7 is formed and which has a higher electrical conductivity than the material from which the contact element 7 is formed.
• the contact spring 7 with the coating 20 can also be referred to as a hybrid spring.
• FIG. 4 like FIG. 3, shows a cross section through a turn of the contact spring 7.
• the exemplary embodiment according to FIG. 4 differs from FIG. 3 in that the structure of the coating 20.
• the coating 20 has several layers 21, 22, 23 is formed, which together represent the coating 20.
• all layers 21, 22, 23 are formed from metal.
• the layers 21, 22, 23 together have the properties that have already been described above with regard to the formation of the coating 20 from only one material.
• the other layers, which do not have these properties, in particular the lower impedance compared to the contact element 7, can have other tasks, for example they can serve as corrosion protection, diffusion protection or as an adhesive layer.
• all layers 21, 22, 23 individually and in their entirety fulfill the aforementioned properties, in particular have a lower impedance than the contact element 7.
• the first layer 21 is formed as an adhesive layer, preferably as a copper layer.
• the second layer 22 is designed as a diffusion layer, preferably as a nickel layer.
• the third layer 23 also takes on the task of corrosion protection and is preferably designed as a gold layer, silver layer or tin layer.
• the different layers 21, 22, 23 can be formed from any suitable material.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Spark Plugs (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=67544207

Family Applications (1)

Country Status (5)

Family Cites Families (14)

• 2018
  • 2018-07-27 DE DE102018118263.5A patent/DE102018118263A1/de active Pending
• 2019
  • 2019-07-26 US US17/263,296 patent/US11462889B2/en active Active
  • 2019-07-26 CN CN201980048748.XA patent/CN112470354B/zh active Active
  • 2019-07-26 WO PCT/EP2019/070268 patent/WO2020021106A1/de unknown
  • 2019-07-26 EP EP19749662.3A patent/EP3830915A1/de active Pending

Also Published As

Similar Documents

Legal Events