WO2023123558A1 - Multi-electromagnetic interference suppression pen-type ignition coil - Google Patents

Abstract

A multi-electromagnetic interference suppression pen-type ignition coil capable of reducing the effect of electromagnetic interference generated by the ignition coil to the outside under operating conditions. The multi-electromagnetic interference suppression pen-type ignition coil comprises a shell, a flux sleeve, which is arranged outside the shell, a coil assembly, which is arranged in the shell, a high-voltage sheath, which is arranged at a lower end of the shell, and a low-voltage head, which is arranged at an upper end of the shell, wherein the high-voltage sheath is internally provided with a suppression resistor, a negative high-voltage cap and a high-voltage spring, one end of the suppression resistor is connected to the high-voltage spring by means of the negative high-voltage cap, and the other end thereof is connected to a secondary high-voltage end of the coil assembly; the low-voltage head is internally provided with a grounding pin, a high-voltage diode and a filter capacitor, one end of the high-voltage diode is connected to a secondary low-voltage end of the coil assembly, the other end thereof is connected to the grounding pin, one end of the filter capacitor is connected to the secondary high-voltage end of the coil assembly, and the other end thereof is connected to the grounding pin; and the flux sleeve is provided with a buckle, and the grounding pin extends downwards and is then pressed in the buckle and welded with the flux sleeve by means of a laser.

Description

Multiple EMI Suppression Pen Type Ignition Coils technical field

The invention relates to an ignition coil for automobiles.

Background technique

With the improvement of engine performance requirements of engine factories, turbocharged engines are widely used by many vehicle manufacturers in China. Higher engine power performance requires the ignition system to provide ignition coils with large ignition energy and high secondary output voltage to meet the combustion requirements of the engine under various working conditions. The improvement of the output characteristics of the ignition coil by the OEM also increases The negative impact on the outside world when the ignition coil is working, the electromagnetic interference of the coupling pulse voltage generated on the power line B+, if the ignition coil generates a large coupling pulse voltage on the power line B+ when the ignition coil is working, it may affect the nearby electronic components. Normal work such as sensors, electronic regulators, etc. The International Electrotechnical Organization IEC and the International Standards Organization ISO have strict requirements on the electromagnetic interference generated by auto parts and the ability to resist electromagnetic interference. In order to meet the high-performance requirements of the turbocharged engine for the ignition coil and the electromagnetic interference requirements of IEC CISPR25 and ISO 7637-2, the ignition coil supplier must add some additional suppression measures during the development stage of the ignition coil.

technical problem

In order to solve the problems in the prior art, the purpose of the present invention is to provide a multiple electromagnetic interference suppression pen-type ignition coil that can reduce the electromagnetic interference effect of the ignition coil on the outside under working conditions.

technical solution

In order to achieve the above purpose, the technical solution adopted by the present invention is: a multiple electromagnetic interference suppression pen-type ignition coil, including a casing, a magnetic sleeve arranged outside the casing, and a coil assembly arranged inside the casing , the high-voltage sheath arranged at the lower end of the shell, and the low-pressure head arranged at the upper end of the shell; wherein, the high-voltage sheath is provided with a suppression resistor, a negative high-voltage cap, and a high-voltage spring, and the suppression resistor One end is connected to the high-voltage spring through a negative high-voltage cap, and the other end is connected to the secondary high-voltage end of the coil assembly; a ground pin, a high-voltage diode and a filter capacitor are arranged in the low-voltage head, and the One end of the high-voltage diode is connected to the secondary low-voltage end of the coil assembly, the other end is connected to the ground pin, one end of the filter capacitor is connected to the secondary high-voltage end of the coil assembly, and the other end Connected to the grounding pin, the magnetic sleeve is provided with buckles, and the grounding pins extend downwards and are pressed into the buckles and laser welded together with the magnetic sleeve.

Preferably, the end of the high voltage diode extends upwards and is connected to the ground pin.

Preferably, a bracket is arranged inside the low voltage head, and a diode positioning block is arranged on the bracket, and the high voltage diode is fixed between the diode positioning blocks.

Preferably, the working voltage of the high voltage diode is 3kV.

Preferably, the low pressure head is provided with a capacitor positioning groove, and the filter capacitor is arranged in the capacitor positioning groove.

Preferably, the filter capacitor is a 1 μF, 100V film capacitor.

Preferably, the suppression resistor is connected to the secondary high-voltage end of the coil assembly through a secondary plum blossom tab.

Preferably, the suppressing resistor is a wire-wound suppressing resistor of 2.5 kΩ, 20 μH to 30 μH.

Preferably, the bottom of the high-voltage sheath is connected with a cylinder head cover sealing ring.

Preferably, the coil assembly includes an iron core, a secondary frame sheathed outside the iron core, a secondary winding wound on the secondary frame, a secondary The primary skeleton outside the skeleton, the primary winding wound on the primary skeleton, and the PI adhesive tape is arranged on the primary skeleton.

Beneficial effect

Due to the adoption of the above technical scheme, the present invention can reduce the influence of electromagnetic interference generated by the ignition coil on the outside under working conditions, and the design of the wiring harness plug through the cover lock ensures the stability of the signal performance during long-term use. The buckle on the magnetic sleeve and the grounding pin are welded together to ensure that the ignition coil remains firm and reliable for a long time during use, and improves product performance.

Description of drawings

Accompanying drawing 1 is the perspective view of multiple electromagnetic interference suppression pen type ignition coils according to the present invention.

Accompanying drawing 2 is the three-dimensional exploded view of multiple electromagnetic interference suppression pen type ignition coils according to the present invention.

Accompanying drawing 3 is the cross-sectional view of multiple electromagnetic interference suppression pen type ignition coils according to the present invention.

Accompanying drawing 4 and accompanying drawing 5 are partial sectional enlarged views of multiple electromagnetic interference suppression pen type ignition coils of the present invention.

Accompanying drawing 6 has described the high voltage diode of multiple EMI suppression pen type ignition coil according to the present invention.

Figure 7 illustrates the positioning of the bracket and the coil assembly of the multiple EMI suppression pen ignition coil according to the present invention.

Accompanying drawing 8 has described the filter capacitor of multiple EMI suppression pen type ignition coil according to the present invention.

Figure 9 depicts the connection of suppression resistors of multiple EMI suppression pen ignition coils according to the present invention.

Accompanying drawing 10 is the working principle diagram of multiple electromagnetic interference suppression pen type ignition coil according to the present invention.

Accompanying drawing 11 is the power line B+ coupling pulse voltage waveform and the spark plug breakdown voltage waveform captured when the coil is ignited in the no-load condition of the engine during the vehicle test.

BEST MODE FOR CARRYING OUT THE INVENTION

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

The invention adopts multiple suppression electromagnetic interference designs in a high-performance pen-type ignition coil to reduce the negative impact of the ignition coil on the outside at the moment of ignition, and requires the coupling pulse voltage range of the ignition coil to be generated on the coil power line B+ when it is in working condition Control within the range of [-50V, +100V]. After a large number of laboratory tests and vehicle tests, as well as the collation and analysis of test data, the implementation plan is finally determined as follows.

Referring to accompanying drawings 1 to 3, accompanying drawing 1 is a perspective view of the multiple electromagnetic interference suppression pen-type ignition coil according to the present invention, and accompanying drawing 2 is a three-dimensional split of the multiple electromagnetic interference suppression pen-type ignition coil according to the present invention Fig. 3 is a cross-sectional view of multiple electromagnetic interference suppression pen ignition coils according to the present invention. The multiple electromagnetic interference suppression pen-type ignition coil in this embodiment includes a casing 1, a magnetically conductive sleeve 2 arranged outside the casing 1, a coil assembly arranged inside the casing 1, a high-voltage sheath 3 arranged at the lower end of the casing 1, a set The low pressure head 4 at the upper end of the shell 1.

The coil assembly includes an iron core 5, a secondary skeleton 6 sleeved outside the iron core 5, a secondary winding wound on the secondary skeleton 6, a primary skeleton 7 sleeved outside the secondary skeleton 6, and wound on the The primary winding on the primary frame 7 is provided with PI tape 8 .

The high-voltage sheath 3 is provided with a suppression resistor 9, a negative high-voltage cap 10, and a high-voltage spring 11. One end of the suppression resistor 9 is connected to the high-voltage spring 11 through the negative high-voltage cap 10, and the other end is connected to the secondary high-voltage end of the coil assembly; the high-voltage protection The bottom of the sleeve 3 is connected to the spark plug, and a cylinder head cover sealing ring 12 is arranged between the high-voltage sheath 3 and the spark plug.

Accompanying drawing 4 and accompanying drawing 5 are according to the multiple electromagnetic interference suppression pen type ignition coil of the present invention partial sectional enlarged view; Support 13, grounding pin 14, high-voltage diode 15 and filter capacitor 16 are arranged in low-voltage head 4, high-voltage One end of the diode 15 is connected to the secondary low-voltage end of the coil assembly, the other end is connected to the ground pin 14, one end of the filter capacitor 16 is connected to the secondary high-voltage end of the coil assembly, and the other end is connected to the ground pin 14. 2 is provided with buckle 17, the grounding pin 14 extends downwards and is pressed into the buckle 17 and is laser welded together with the magnetic sleeve 2 to ensure that the ignition coil remains firm and reliable for a long time during use, and the firm and reliable magnetic conduction The connection between the sleeve and the ground pin is very important to reduce the coupling pulse voltage interference generated by the coil on the power line B+ when it is working.

A cover 18 is rotatably installed on the low-pressure head 4, and a lock 19 matched with the cover 18 is arranged on the low-pressure head 4. The lock 19 is supported on the cover 18 to ensure that the cover 18 is vertical before loading. The direction is convenient for plug installation; after the wiring harness plug and the coil plug are assembled, the lock 19 is locked on the cover 18 to ensure the horizontal direction of the cover 18 to lock the wiring harness plug.

Accompanying drawing 6 has described the high-voltage diode of multiple electromagnetic interference suppression pen type ignition coil according to the present invention; The bottom of support 13 is provided with fixed terminal 20, and the top of coil assembly is provided with positioning groove 21, and support 13 is arranged on positioning by fixed terminal 20 In slot 21.

Accompanying drawing 7 has described the positioning of the bracket and the coil assembly according to multiple electromagnetic interference suppression pen type ignition coils of the present invention; Diode positioning block 22 is arranged on the bracket 13, wherein a pair is positioned at the both sides of high-voltage diode 15, and another one is positioned at high-voltage diode 15 The lower end of the diode 15 , the high voltage diode 15 is fixed between the diode positioning blocks 22 . One pole of the high voltage diode 15 extends downwards and is connected to the secondary low voltage terminal, and the other pole extends upwards and is connected to the ground pin 14 . The locking buckle 19 is inserted vertically downward into the diode positioning block 22 to position the high-voltage diode 15 in the longitudinal direction, so as to ensure the reliability of the coil under vibration. The high-voltage diode adopts Sanken high-voltage diode with a working voltage of 3kV.

Accompanying drawing 8 has described the filter capacitor of multiple electromagnetic interference suppression pen type ignition coil according to the present invention, low-pressure head 4 is provided with capacitor positioning groove 24, and filter capacitor 16 is arranged in capacitor positioning groove 24, and filter capacitor 16 is positioned at high voltage diode 15 above. The filter capacitor is a 1μF, 100V Xiamen Farah Electronic film capacitor.

Accompanying drawing 9 has described the connection of the suppressing resistance of multiple electromagnetic interference suppressing pen type ignition coil according to the present invention; Suppressing resistor 9 is connected to the secondary high voltage end of coil assembly through secondary plum blossom insert 23. The suppressing resistor 9 is a wire-wound suppressing resistor of 2.5kΩ, 20μH-30μH from Shanghai Carat Electronics.

Accompanying drawing 10 is the working principle diagram of multiple electromagnetic interference suppression pen type ignition coil according to the present invention, and accompanying drawing 11 is the power line B+ coupling pulse voltage waveform and spark plug breakdown voltage captured when the coil is ignited in the engine no-load condition during the vehicle test waveform. Comparison of the coupling pulse voltage test results measured on the power line B+ at the moment of coil ignition under the vehicle's no-load condition: the test results under the vehicle's no-load condition show that multiple suppression measures can effectively reduce the coupling of the ignition coil to the power line B+ at the moment of ignition The impact of pulse voltage can meet the customer's requirements and control the coupling pulse voltage within the range of [-50V, +100V]; however, the coupling pulse voltage generated on the power line B+ by using only a simple suppression method of 3kV high voltage diode far exceeds that of the customer requirements.

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Table 1 shows the maximum coupling pulse voltage and the maximum breakdown voltage of the spark plug gap measured on the power line B+ at the moment of coil ignition under the engine no-load condition. It can be seen that the present invention can effectively reduce the influence of electromagnetic interference generated by the ignition coil on the outside under working conditions. The design of the cover locking harness plug ensures the stability of the signal performance during long-term use. The buckle on the magnetic sleeve and the grounding pin are welded together to ensure that the ignition coil remains firm and reliable for a long time during use, and improves product performance.

The above embodiments are only to illustrate the technical concept and characteristics of the present invention. All equivalent changes or modifications shall fall within the protection scope of the present invention.

Claims (10)

1. A multiple electromagnetic interference suppression pen-type ignition coil, characterized in that it includes a casing, a magnetic sleeve arranged outside the casing, a coil assembly arranged inside the casing, and a high-voltage coil arranged at the lower end of the casing. The sheath, the low-pressure head arranged on the upper end of the shell; wherein,

   The high-voltage sheath is provided with a suppression resistor, a negative high-voltage cap, and a high-voltage spring. One end of the suppression resistor is connected to the high-voltage spring through a negative high-voltage cap, and the other end is connected to the secondary coil assembly. high voltage side;

   The low-voltage head is provided with a grounding pin, a high-voltage diode and a filter capacitor. One end of the high-voltage diode is connected to the secondary low-voltage end of the coil assembly, and the other end is connected to the grounding pin. One end of the filter capacitor is connected to the secondary high-voltage end of the coil assembly, the other end is connected to the ground pin, the magnetic sleeve is provided with a buckle, and the ground pin is downward After extension, it is press-fitted in the buckle and laser-welded with the magnetic sleeve.
2. The multiple EMI suppression pen-type ignition coil according to claim 1, characterized in that: the end of the high voltage diode extends upwards and is connected to the grounding pin.
3. The multiple electromagnetic interference suppression pen-type ignition coil according to claim 1 is characterized in that: a bracket is arranged in the low-pressure head, a diode positioning block is arranged on the bracket, and the high-voltage diode is fixed on the between the diode positioning blocks.
4. The multiple electromagnetic interference suppression pen type ignition coil according to claim 3 is characterized in that: the working voltage of the high voltage diode is 3kV.
5. The multiple electromagnetic interference suppression pen type ignition coil according to claim 1, characterized in that: said low pressure head is provided with a capacitor positioning groove, and said filter capacitor is arranged in said capacitor positioning groove.
6. The multiple electromagnetic interference suppression pen type ignition coil according to claim 5 is characterized in that: the filter capacitor is a 1 μF, 100V film capacitor.
7. The multiple electromagnetic interference suppression pen-type ignition coil according to claim 1, characterized in that: the suppression resistor is connected to the secondary high-voltage end of the coil assembly through a secondary plum-blossom insert.
8. The multiple electromagnetic interference suppression pen-type ignition coil according to claim 7, characterized in that: the suppression resistance is a wire-wound suppression resistance of 2.5 kΩ, 20 μH to 30 μH.
9. The multiple electromagnetic interference suppression pen-type ignition coil according to claim 1, characterized in that: the bottom of the high-voltage sheath is connected with a cylinder head cover sealing ring.
10. The multiple electromagnetic interference suppression pen-type ignition coil according to claim 1, characterized in that: said coil assembly includes an iron core, a secondary frame sheathed outside said iron core, and wound on said secondary The secondary winding on the secondary skeleton, the primary skeleton sheathed on the outside of the secondary skeleton, the primary winding wound on the primary skeleton, and the PI tape is arranged on the primary skeleton.