High energy ignition coil

Abstract

The utility model discloses a high-energy ignition coil which comprises a coil winding (a primary coil 2 and a secondary coil 3), a framework 8, an iron core 1, a quick switch control module 4 and a high-voltage / low-voltage connector. The primary coil 2 (200-500 turns and large wire diameter) is connected with a low-voltage power supply and is controlled to be switched on and switched off through a quick switching device, and the secondary coil 3 (15000-25000 turns and small wire diameter) is connected with the primary coil and outputs high voltage to a spark plug; the magnetic conductivity is enhanced by the iron core 1, the coil is fixed and insulated by the framework 8, the primary current is instantaneously cut off by the quick switching device (IGBT / MOSFET) to attenuate the magnetic field, and the secondary induces high voltage greater than or equal to 30kV. The structure solves the problem that mixed gas of a high-compression-ratio engine is difficult to ignite, obviously improves ignition energy and idling stability, and has the advantages of being simple in structure and high in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to internal combustion engine ignition system, concretely is a kind of high-energy ignition coil. BACKGROUND

[0002] Modern engine is to promote fuel efficiency, generally adopts high compression ratio design (such as >10:1), leading to the significant increase of mixed gas density in combustion chamber.Under the fuel direct injection working condition (air-fuel ratio >14.7:1), mixed gas is more difficult to ignite, and traditional ignition coil is prone to cause ignition failure or weak spark intensity due to insufficient energy, and further cause engine idle speed instability, shaking or even misfire.The main technical bottleneck is that:

[0003] High core eddy current loss: traditional core material or structure leads to low magnetic field conversion efficiency, and large energy loss;

[0004] Unreasonable coil design: primary coil wire diameter is too thin (resistance is large, and it is difficult to store large current energy), and secondary coil turns are insufficient (induced voltage is low), so that the high compression ratio mixed gas cannot meet the high voltage ignition requirement;

[0005] Slow response of switch control: primary current is not cut off in time, and the magnetic field decay efficiency is low, so that the secondary induced voltage is insufficient.

[0006] Therefore, it is urgent to develop a high-energy, high-reliability ignition coil. INVENTION CONTENTS

[0007] The utility model aims at solving the technical problem that high compression ratio engine is difficult to ignite due to large mixed gas density in prior art, provides a kind of high-energy ignition coil, and by optimizing core structure, coil winding design and fast switch control, the ignition energy output is significantly improved, and the mixed gas is reliably ignited, and the engine idle speed stability is improved.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of high-energy ignition coil, including shell, shell is provided with framework, coil winding, core, high-voltage connector and circuit board, core is inserted into the hollow portion of framework, framework is fixed in the inner chamber of shell,

[0009] Coil winding includes primary coil and secondary coil;The one end of the primary coil is connected with the positive pole of low-voltage power supply, and the other end is controlled by fast switch device control on-off;The one end of the secondary coil is connected with the primary coil, and the other end is output high-voltage electricity to spark plug through high-voltage connector;

[0010] Framework is placed in shell and is used to fix the primary coil and secondary coil;

[0011] An iron core formed by laminating 0.35 mm thick silicon steel sheets is used to enhance the magnetic permeability so that a strong magnetic field is generated when the primary coil is energized and a high voltage is induced in the secondary coil when the primary coil is de-energized.

[0012] The circuit board is placed in the inner cavity of the shell and connected to the wiring socket on the shell, and the coil winding is placed in the inner cavity of the shell, and a heat insulation cavity is arranged between the circuit board and the coil winding.

[0013] The number of turns of the primary coil is 200-500 turns, and the wire diameter is thick; the number of turns of the secondary coil is 15000-25000 turns, and the wire diameter is thin; and the high-voltage connector is directly connected to the end of the secondary coil.

[0014] The wire diameter of the primary coil is 0.8 mm~1.2 mm; the wire diameter of the secondary coil is 0.08 mm~0.1 mm.

[0015] The iron core is formed by laminating silicon steel sheets, and the thickness of the silicon steel sheets is 0.2~0.5 mm.

[0016] The fast switching device includes a control chip and a high-speed switching device, and the high-speed switching device is connected in series to the non-power end of the primary coil for instantaneously disconnecting the primary current.

[0017] The skeleton is made of insulating material, the inner wall of which is adapted to the outer diameter of the iron core, and the outer wall is provided with a wire slot for fixing the primary coil and the secondary coil in layers.

[0018] The high-voltage connector is wrapped with high-voltage resistant insulating material to ensure that the output voltage is ≥30 kV.

[0019] The shell is made of plastic material and has an epoxy resin packaging structure for protecting the internal coil and fixing the components.

[0020] The beneficial effects of the utility model are:

[0021] 1. High energy output: the primary coil carries large current through thick wire diameter, and the secondary coil converts magnetic field change into ≥30 kV high voltage through multiple turns of thin wire diameter, meeting the ignition demand of high compression ratio engine mixed gas.

[0022] 2. Precise control: the fast switching device instantaneously cuts off the primary current through high-speed switching device, the magnetic field decay efficiency is high, the secondary induced voltage is stable, and the problem of shaking caused by difficult ignition of mixed gas at idle speed is solved.

[0023] 3. Insulation and stability: the skeleton isolates the primary / secondary coil, the iron core enhances the magnetic permeability, the overall structure is compact, and the reliability is high and the service life is long.

[0024] 4. Heat insulation optimization: the heat insulation air can isolate the heat of the coil assembly from the circuit board, reduce the heating of the circuit board, and prolong the service life of the circuit board.

[0025] The utility model will be further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the structural diagram of the specific embodiment of the utility model;

[0027] Figure 2 is Figure 1 the enlarged view of A.

[0028] Explanation of reference numerals: 1 - iron core; 2 - primary coil; 3 - secondary coil; 4 - fast switching device; 5 - shell; 6 - high-voltage connector; 7 - low-voltage connector; 8 - coil skeleton; 9 - heat insulation cavity; 10 - circuit board. DETAILED DESCRIPTION

[0029] The utility model will be further described below in combination with the drawings and specific embodiments.

[0030] As Figure 1 , Figure 2 shown, the embodiment discloses a high-energy ignition coil, which comprises a shell, a skeleton 8, a coil winding, an iron core 1, a high-voltage connector 6 and a circuit board 10 are arranged in the shell, the circuit board 10 is connected with the low-voltage connector 7 integrally formed with the shell, the iron core 1 is inserted into the hollow part of the skeleton 8, the skeleton is fixed in the inner cavity of the shell 5,

[0031] coil winding, comprising primary coil 2 and secondary coil 3;The primary coil 2 is connected with the positive pole of low-voltage power supply at one end, and the other end is controlled to be on-off through the fast switching device;When energized, store electromagnetic energy, when de-energized, trigger magnetic field attenuation;The secondary coil 3 is connected with the primary coil 2 at one end, and high-voltage electricity is output to the spark plug through the high-voltage connector 6 at the other end;

[0032] skeleton 8, for fixing primary coil 2 and secondary coil 3, and providing insulation support between primary and secondary (skeleton material is high-insulation plastic, such as PBT, PA66 or PEEK, temperature resistance ≥ 150 DEG C, insulation strength ≥ 20 kV / mm);Its structure is adapted to the outer shape of the iron core (such as cylindrical hollow), the inner wall is matched with the gap of the iron core, the outer wall is provided with a wire winding groove to wind the coil in layers (primary winding 200~500 turns, secondary winding 15000~25000 turns), to ensure that the coil is tight and insulation is reliable.

[0033] High-voltage joint 6: directly welded or crimped with the end of the secondary coil 3 (not connected to the primary coil), wrapped with high-voltage insulation material (such as ceramic or high-voltage plastic), to ensure that the high-voltage of ≥30kV is transmitted to the spark plug without loss.

[0034] Iron core 1, made of silicon steel sheets (preferably 0.2-0.5mm thick, such as 0.35mm), located in the hollow part of the framework 8, together with the primary coil and secondary coil wound on the framework to form a closed magnetic circuit; its function is to enhance the magnetic permeability, so that a strong magnetic field is generated when the primary coil is energized, and the magnetic field decays rapidly when the power is off to increase the secondary induced voltage.

[0035] The circuit board 10 is placed in the inner cavity of the shell 5 and connected to the wiring socket on the shell 5, and the chip inside the circuit board 10 is used to receive the ECU signal to control the primary coil on-off. The coil winding is also placed in the inner cavity of the shell 5, and a heat insulation cavity 9 is provided between the circuit board 10 and the coil winding to effectively isolate the influence of coil heat on the circuit board 10.

[0036] The number of turns of the primary coil 2 is 200-500 turns, and the wire diameter is thick; the number of turns of the secondary coil 3 is 15000-25000 turns, and the wire diameter is thin; the high-voltage joint 6 is directly connected to the end of the secondary coil 3; when the primary magnetic field decays, a high voltage of ≥30kV is generated by electromagnetic induction.

[0037] The wire diameter of the primary coil 2 is 0.8-1.2mm; the wire diameter of the secondary coil 3 is 0.08-0.1mm.

[0038] The iron core 1 is made of silicon steel sheets with a thickness of 0.2-0.5mm.

[0039] The fast switching device 4 includes a control chip (such as MCU) and a high-speed switching device (such as IGBT or MOSFET), the input end of which receives the ignition signal from the automobile ECU, and the output end is connected to the non-power end of the primary coil 2 (i.e. the node controlling the on-off of the primary coil); when the ignition demand is detected, the control chip triggers the high-speed switching device to instantaneously disconnect the primary circuit (disconnection time ≤100μs), forcing the primary current to drop sharply, and the magnetic field to decay rapidly, inducing a high voltage in the secondary coil 3.

[0040] The framework 8 is made of insulating material, the inner wall of which is adapted to the outer diameter of the iron core 1, and the outer wall is provided with a winding groove to fix the primary coil 2 and the secondary coil 3 in layers.

[0041] The shell 5 is made of plastic material and has an epoxy resin packaging structure to protect the internal coil and fix the components.

[0042] The above technical scheme can achieve the following technical effects:

[0043] 1. High energy output: The primary coil carries a large current (stores more electromagnetic energy) through thick wire diameter conductors, and the secondary coil converts magnetic field changes into ≥30kV high voltage through multiple turns of thin wire diameter conductors, meeting the ignition requirements of high compression ratio engine mixture.

[0044] 2. Precise control: The fast switch device cuts off the primary current instantaneously through high-speed switching components (response time ≤100μs), the magnetic field decay efficiency is high, and the secondary induced voltage is stable, solving the problem of shaking caused by the difficulty of igniting the mixture at idle speed.

[0045] 3. Insulation and stability: The framework isolates the primary / secondary coils (voltage resistance ≥20kV / mm), the core enhances the magnetic permeability (improves energy conversion efficiency), and the overall structure is compact (fits single cylinder independent ignition), with high reliability and long service life.

[0046] 4. Heat insulation optimization: Heat insulation air can isolate the heat of the coil assembly from the circuit board, reducing the heating of the circuit board and prolonging the service life of the circuit board.

Claims

1. A high-energy ignition coil, comprising a shell, a skeleton (8), a coil winding, a core (1), a high-voltage connector (6) and a circuit board (10) arranged in the shell, the core (1) being inserted into the hollow part of the skeleton (8), the skeleton being fixed in the inner cavity of the shell (5), characterized in that: the coil winding comprises a primary coil (2) and a secondary coil (3); one end of the primary coil (2) is connected with the positive pole of a low-voltage power supply, and the other end is controlled to be turned on or turned off through a fast switching device; one end of the secondary coil (3) is connected with the primary coil (2), and the other end outputs high-voltage electricity to a spark plug through the high-voltage connector (6); the skeleton (8) is arranged in the shell (5) to fix the primary coil (2) and the secondary coil (3); the core (1) is formed by laminating 0.35 mm thick silicon steel sheets to enhance the magnetic permeability, so that a strong magnetic field is generated when the primary coil (2) is electrified, and high voltage is induced in the secondary coil (3) when the primary coil (2) is de-energized; the circuit board (10) is arranged in the inner cavity of the shell (5) and connected with the wiring socket on the shell (5), the coil winding is arranged in the inner cavity of the shell (5), and a heat insulation cavity (9) is arranged between the circuit board (10) and the coil winding; the number of turns of the primary coil (2) is 200-500 turns, and the wire diameter is thick; the number of turns of the secondary coil (3) is 15000-25000 turns, and the wire diameter is thin; the high-voltage connector (6) is directly connected with the end of the secondary coil (3). The wire diameter of the primary coil (2) is 0.8 mm-1.2 mm; the wire diameter of the secondary coil (3) is 0.08 mm-0.1 mm.

2. The high-energy ignition coil of claim 1, wherein, The core (1) is formed by laminating silicon steel sheets, and the thickness of the silicon steel sheets is 0.2-0.5 mm.

3. The high energy ignition coil of claim 1, wherein, The fast switching device comprises a control chip and a high-speed switching device, and the high-speed switching device is connected in series with the non-power supply end of the primary coil (2) to instantaneously turn off the primary current.

4. The high energy ignition coil of claim 1, wherein, The skeleton (8) is made of insulating material, the inner wall of which is adapted to the outer diameter of the core (1), and the outer wall is provided with a wire winding groove to fix the primary coil (2) and the secondary coil (3) in layers.

5. The high energy ignition coil of claim 1, wherein, The high-voltage connector (6) is wrapped with high-voltage resistant insulating material to ensure that the output voltage is ≥30 kV.

6. The high energy ignition coil of claim 1, wherein, The shell (5) is made of plastic material and has an epoxy resin packaging structure to protect the internal coil and fix the components.

7. The high energy ignition coil of claim 1, wherein, ​

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