Intelligent penholder type ignition coil

Abstract

The utility model discloses an intelligent penholder type ignition coil which comprises a penholder type shell (a top inner cavity is provided with a circuit board with a chip, and a penholder part comprises an iron core, a framework, a coil winding and a high-pressure connector), and the outer wall of the shell is provided with an annular limiting sleeve for controlling the distance between the chip and a cylinder body; the outer wall of the penholder part is sleeved with a grounded stainless steel sleeve (shielding signal interference), a top inner cavity is provided with a heat insulation plate (a circuit board is mounted on the heat insulation plate, and a heat insulation pad is arranged therebetween); and the steel sleeve is provided with a matched limiting opening (positioning after insertion, and heat dissipation holes are formed in the outer wall). The environment temperature of the chip is reduced through the heat insulation structure, the steel sleeve shields signal interference and assists in heat dissipation, the problems of chip high-temperature damage, signal interference and insufficient heat insulation in the prior art are solved, and the reliability of an ignition system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile ignition system, specifically relates to an intelligent penholder type ignition coil. BACKGROUND

[0002] Penholder type ignition coil is used for modern engine, its structure contains shell, coil winding, circuit board and high voltage connector, the circuit board is connected with automobile ECU through low voltage connector, built-in control chip receives ignition instruction, monitors working state and feeds back signal. Prior art has following problems: 1. Chip is influenced by high temperature (engine cylinder high temperature causes chip unstable operation, shortened life and state feedback abnormality);2. Insufficient heat protection (shell lacks special heat insulation structure, and chip is easily influenced by heat radiation / conduction);3. Signal interference (chip is easily influenced by surrounding voltage / magnetic field interference, influences ECU signal transmission). UTILITY MODEL CONTENTS

[0003] In view of prior art's insufficient, the utility model's purpose lies in providing an intelligent penholder type ignition coil, solves chip high temperature damage, insufficient heat insulation and signal interference problem.

[0004] To realize above-mentioned purpose, the utility model provides the following technical scheme: an intelligent penholder type ignition coil, including the shell of penholder, the top inner chamber of shell is installed with the circuit board of chip, the penholder part of shell is built-in with iron core, skeleton, coil winding and high voltage connector, the skeleton is sleeved on the iron core, the coil winding is wound on the skeleton, the high voltage connector is electrically connected with the coil winding, the circuit board is electrically connected with the coil winding;The outer wall of shell is equipped with annular limit sleeve, for controlling the distance between chip and engine cylinder;The penholder part outer wall of shell is sleeved with the steel sleeve of stainless steel material of grounding, and the steel sleeve is used for shielding signal interference;The top inner chamber of shell is provided with transversely arranged heat insulation plate, the circuit board is installed on the upper end surface of heat insulation plate, and heat insulation pad is further arranged between the circuit board and the upper end surface of heat insulation plate;The lower part of shell is provided with the elastic compression block that is evenly distributed in circumference, the lower part of steel sleeve is provided with the limit port matched with the elastic compression block, after the steel sleeve is inserted into the shell, the elastic compression block is positioned from the limit port to position the steel sleeve, and the outer wall of steel sleeve is further provided with the heat dissipation hole that is evenly distributed in circumference.

[0005] The heat insulation plate is mica material, and the thickness is 1mm-3mm.

[0006] The heat insulation pad is silica gel material, and the thickness is 0.5mm-2mm.

[0007] The wall thickness of steel sleeve is 0.2mm-0.5mm.

[0008] The utility model discloses a beneficial effect is: heat insulation board + heat insulation pad reduces chip ambient temperature, steel cover ground shield signal interference, limit set control chip and cylinder distance, steel cover heat dissipation hole auxiliary heat dissipation, comprehensive promotion chip stability, life and ignition system reliability.

[0009] The utility model is further described below in combination with the drawings and specific embodiments. DRAWINGS

[0010] Figure 1 It is the perspective view of the specific embodiment of the utility model;

[0011] Figure 2 It is the sectional view of the specific embodiment of the utility model.

[0012] Mark explanation: 1 - shell; 2 - circuit board; 3 - chip; 4 - core; 5 - framework; 6 - coil winding; 7 - high voltage connector; 8 - limit set; 9 - steel cover; 10 - heat insulation board; 11 - heat insulation pad; 12 - elastic compression block; 13 - limit port; 14 - heat dissipation hole. SPECIFIC EMBODIMENT

[0013] The utility model is specifically described below through examples, and is only used for further illustrating the utility model, and can not be understood as the limitation of the protection scope of the utility model.

[0014] As Figure 1 , Figure 2 Indicated, this embodiment provides a kind of intelligent pen barrel type ignition coil, and its structure design and working process are as follows:

[0015] I, the connecting relationship of each component

[0016] Shell and internal core assembly shell 1 are integrally injection molded using engineering plastics (such as PA66+GF30% glass fiber reinforced nylon), and the whole is pen barrel-shaped, divided into top inner cavity and pen barrel part two parts.

[0017] Top inner cavity: install the circuit board 2 with chip 3, chip 3 is the control core (built-in MCU and signal processing module) of ignition coil, is connected with automobile ECU through low-voltage wire harness (not shown); the lower end surface of circuit board 2 is fixed to the upper end surface of heat insulation board 10 through heat-conducting silicone grease, and heat insulation board 10 is mica material (temperature resistance 600 DEG C above, good insulation), and the thickness is 2mm, and the lower end surface is pasted with heat insulation pad 11 (silica gel material, thickness 1mm) through double-sided adhesive, and heat insulation pad 11 further insulates the heat conduction from the bottom of shell.

[0018] Rod part: built-in core 4 (silicon steel sheet is laminated, the section is cylindrical), skeleton 5 (phenolic resin injection molding, center hole sleeve core 4), coil winding 6 (primary winding and secondary winding are coaxially wound on the skeleton 5, the primary winding is thick, the number of turns is small, the secondary winding is thin, the number of turns is large) and high-voltage connector 7 (copper terminal, welded with the output end of the secondary winding). Among them, the core 4 is fixed axially through the positioning boss of the inner wall of the shell 1, the skeleton 5 is sleeved on the outer periphery of the core 4, and the two ends of the coil winding 6 are welded with the corresponding pins of the circuit board 2 through wires (realize the input of electric energy and signal feedback).

[0019] Thermal insulation and distance control structure The outer wall of the shell 1 (close to the top inner cavity position) is integrally formed with an annular limiting sleeve 8, which is used to limit the minimum distance between the chip 3 and the engine cylinder (to avoid the chip directly attached to the high-temperature cylinder), and to ensure that the chip working environment temperature is lower than 85℃ (under normal cylinder high-temperature working condition, the limiting sleeve 8 makes the chip and the cylinder at least 8mm apart).

[0020] Signal shielding and structure fixing assembly The outer wall of the shell 1 is sleeved with a steel sleeve 9 made of stainless steel (wall thickness 0.3mm, surface polishing treatment), and the lower part of the steel sleeve 9 is uniformly distributed with four limiting openings 13 (rectangular notch, size 5mm×2mm); The lower outer wall of the shell 1 is integrally formed with four elastic pressing blocks 12 (plastic material, with arc-shaped barbs) corresponding to the position of the limiting opening 13; When the steel sleeve 9 is sleeved into the pen barrel from the top of the shell 1, the barbs of the elastic pressing block 12 are clamped into the limiting opening 13, realizing the axial positioning of the steel sleeve 9 (to prevent falling off). The steel sleeve 9 is grounded (connected with the car body through the grounding contact of the outer wall of the shell 1), and the outer wall is uniformly distributed with eight heat dissipation holes 14 (diameter 2mm, adjacent hole spacing 3mm), which is used to assist the dissipation of a small amount of heat generated by the chip and the coil winding.

[0021] II. Working process

[0022] Installation stage: the steel sleeve 9 is sleeved into the pen barrel from the top of the shell 1, and the elastic pressing block 12 is clamped into the limiting opening 13 to complete the fixation; At this time, the steel sleeve 9 is grounded (connected with the car body through the grounding structure of the shell 1), and the limiting sleeve 8 ensures that the chip 3 and the engine cylinder maintain a safe distance.

[0023] Ignition control stage: the automobile ECU sends ignition instructions (such as ignition timing and energy requirements) to the circuit board 2 through the low-voltage wire harness, and the chip 3 in the circuit board 2 receives the instructions and controls the primary winding to be powered on (to generate a changing magnetic field), the magnetic field is coupled to the secondary winding through the iron core 4, the secondary winding induces high-voltage electricity (about 20-30kV), which is transmitted to the spark plug through the high-voltage connector 7 to ignite the mixture; at the same time, the chip 3 monitors the primary / secondary coil resistance, temperature (through the built-in temperature sensor) and circuit on-off state in real time, and feeds back the state signal to the ECU.

[0024] Thermal insulation and anti-interference stage: the high temperature generated by the engine block (such as above 100℃ under high load conditions) is blocked by the limiting sleeve 8, so that the chip 3 is separated from the cylinder block by at least 8mm; the heat insulation plate 10 (mica material) and the heat insulation pad 11 (silica gel material) further reduce the environmental temperature of the chip 3 (the measured temperature in the chip area is ≤80℃); the steel sleeve 9 forms an electromagnetic shielding layer after grounding, which blocks the voltage fluctuation and magnetic field interference (such as electromagnetic noise generated by the generator and high-voltage wire harness) in the engine compartment, ensuring stable signal transmission between the chip 3 and the ECU; the heat dissipation holes 14 on the outer wall of the steel sleeve 9 assist in dissipating a small amount of heat generated by the coil winding and the chip 3 during operation (to avoid local overheating).

[0025] Through the synergistic effect of the above structure, the embodiment solves the problems of unstable chip operation, short service life and ignition system failure caused by high temperature, signal interference and insufficient thermal insulation of traditional pen barrel type ignition coils, significantly improving the reliability of the ignition system and the control accuracy of the engine.

Claims

1. An intelligent bobbin-type ignition coil, characterized by, The application relates to a pen barrel type shell (1), a circuit board (2) with a chip (3) is arranged in the top inner cavity of the shell (1), an iron core (4), a framework (5), a coil winding (6) and a high-voltage connector (7) are arranged in the pen barrel of the shell (1), the framework (5) is sleeved on the iron core (4), the coil winding (6) is wound on the framework (5), the high-voltage connector (7) is electrically connected with the coil winding (6), and the circuit board (2) is electrically connected with the coil winding (6); a ring-shaped limiting sleeve (8) is arranged on the outer wall of the shell (1); a steel sleeve (9) made of stainless steel and used for grounding is sleeved on the outer wall of the pen barrel of the shell (1); a transversely arranged heat insulation plate (10) is arranged in the top inner cavity of the shell (1), the circuit board (2) is arranged on the upper end face of the heat insulation plate (10), and a heat insulation pad (11) is further arranged between the circuit board (2) and the upper end face of the heat insulation plate (10).

2. The smart bobbin ignition coil of claim 1, wherein, Elastic compression blocks (12) are uniformly arranged on the lower part of the shell (1), the lower part of the steel sleeve (9) is provided with limiting openings (13) matched with the elastic compression blocks (12), the elastic compression blocks (12) are inserted into the limiting openings (13) to position the steel sleeve (9) after the steel sleeve (9) is inserted into the shell (1), and heat dissipation holes (14) are further arranged on the outer wall of the steel sleeve (9).

3. The smart bobbin ignition coil of claim 1, wherein, The heat insulation plate (10) is made of mica and has a thickness of 1mm-3mm.

4. The smart bobbin ignition coil of claim 1, wherein, The heat insulation pad (11) is made of silica gel and has a thickness of 0.5mm-2mm.

5. The smart bobbin ignition coil of claim 1, wherein, The thickness of the steel sleeve (9) is 0.2mm-0.5mm.

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