Engine cylinder-out cause detector

Abstract

This utility model relates to an engine misfire detection instrument, comprising: a 20mA digital DC ammeter, a first LED, and a 5V DC battery connected in series on circuit one; circuit one connects to pin 1 of the ignition coil male and female connectors, and the negative terminal of the 5V DC battery is connected to a ground wire; a microcontroller and a second LED are electrically connected to circuit two, which also connects to pin 2 of the ignition coil male and female connectors, and the ground terminal of the microcontroller is connected to a ground wire; circuit three directly connects to pin 3 of the ignition coil male and female connectors; circuit four connects to pin 3 of the ignition coil male and female connectors, and circuit four is divided into two paths: one path connects in series with the 20A digital ammeter and a first self-locking switch, and the other path connects in series with a 100W-130W high-power bulb and a second self-locking switch. This utility model uses four detection circuits connected to the ignition coil T-connector to troubleshoot faults.

Description

Technical Field

[0001] This utility model relates to the field of engine vibration detection technology, specifically to an engine misfire detection instrument. Background Technology

[0002] After prolonged use, a car may experience engine vibration. Engine vibration can be caused by various factors, such as clogged fuel injectors, abnormal control circuits, damaged ignition coils or spark plugs, or other control circuit malfunctions. Typical engine misfire detection devices use a car diagnostic tool to diagnose and troubleshoot the problem, which is time-consuming and can only narrow down the possible causes, not completely eliminate the fault.

[0003] Therefore, there is an urgent need for a convenient and fault-identifying testing instrument. Summary of the Invention

[0004] To address the difficulty in troubleshooting engine vibration, this invention proposes an engine misfire detection instrument. It features a four-channel detection circuit connected to the male and female connectors of the ignition coil via a three-way plug to diagnose the fault.

[0005] To address the aforementioned issues, an engine misfire detection device is proposed, comprising an ignition coil male and female connector, a housing, two ignition coil T-connectors, and a detection circuit. The two ignition coil T-connectors are respectively connected to pins 1-4 of the ignition coil male and female connectors. The detection circuit includes line 1, line 2, line 3, and line 4, all of which are connected to the ignition coil male and female connectors via the two ignition coil T-connectors.

[0006] A 20mA digital DC ammeter, a first LED, and a 5V DC battery are connected in series on line one. Line one is connected to pin 1 of the male and female connectors of the ignition coil. The negative terminal of the 5V DC battery is connected to a ground wire.

[0007] The second line is electrically connected to a microcontroller and a second light-emitting diode. The second line is connected to pin 2 of the male and female connectors of the ignition coil. The grounding terminal of the microcontroller is connected to the ground wire.

[0008] The third line is directly connected to pin 3 of the male and female connectors of the ignition coil. The fourth line is connected to pin 3 of the male and female connectors of the ignition coil. The fourth line is divided into two paths. One path is connected in series with a 20A digital display ammeter and a first self-locking switch. The other path is connected in series with a 100W-130W high-power bulb and a second self-locking switch.

[0009] Furthermore, the ignition coil three-way plug includes a high-temperature resistant insulated plug, and the four pins of the ignition coil three-way plug are insulated. Insulating sleeves are provided on the outside of the first, second, third and fourth lines, and the first, second, third and fourth lines are insulated through the insulating sleeves.

[0010] Insulation treatment is used to avoid interference between lines.

[0011] Furthermore, the No. 1, No. 2, No. 3 and No. 4 lines are all copper wires with a diameter of 0.35mm-1.5mm.

[0012] Furthermore, the positive terminal of the first light-emitting diode is connected to line number one, and the negative terminal is connected to a 20mA digital display DC ammeter. A 5V DC battery powers the 20mA digital display DC ammeter.

[0013] The first light-emitting diode includes a common monochrome light-emitting diode.

[0014] Furthermore, the input terminal of the microcontroller is connected to line number two, the output terminal of the microcontroller is connected to the positive terminal of the second light-emitting diode, and the negative terminal of the second light-emitting diode is grounded;

[0015] The microcontroller is powered by a 5V DC battery.

[0016] Furthermore, the grounding wire includes a conductor and an iron clamp, the conductor and the iron clamp being connected, and the iron clamp being grounded. The iron clamp is used to clamp the engine casing to achieve the grounding effect.

[0017] Furthermore, the housing is a hollow square structure with a detection circuit inside. The housing has a wire outlet hole, and the upper end of the housing has a window corresponding to the 20mA digital display DC ammeter and the 20A digital display ammeter. The housing has a button hole corresponding to the first self-locking switch and the second self-locking switch, and a lamp hole corresponding to the first light-emitting diode and the second light-emitting diode.

[0018] The housing protects the detection circuit.

[0019] The beneficial effects of this utility model through the above technical solution are as follows:

[0020] This invention enables fault detection of automotive engine vibration. It employs a four-channel detection circuit. When engine vibration is caused by the ignition coil and spark plugs, circuits three and four are used to check the ignition coil power supply when the engine is stationary. Under normal conditions, pressing the second self-locking switch in circuits three and four will keep the bulb constantly lit; pressing the first self-locking switch in the same circuit will cause a 20A digital ammeter to display the current. Circuit two checks the control signal from the engine control unit; when normal, the second LED in the circuit will flash at a frequency of 50ms. Circuit one checks the spark plugs in the secondary circuit when the engine is running; when normal, a 20mA digital DC ammeter will display a current of 5-6mA, and the first LED will flash at a frequency of 50ms. Attached Figure Description

[0021] Figure 1 This is a circuit diagram of an engine misfire detection instrument according to the present invention;

[0022] Figure 2 This is a schematic diagram of the mechanism of an engine misfire detection instrument according to the present invention.

[0023] Reference numerals: 1 is the housing, 2 is the ignition coil three-way plug, 3 is the 20mA digital display DC ammeter, 4 is the first LED, 5 is the 5V DC battery, 6 is the grounding wire, 7 is the microcontroller, 8 is the second LED, 9 is the 20A digital display ammeter, 10 is the first self-locking switch, and 11 is the second self-locking switch. Detailed Implementation

[0024] Example 1

[0025] like Figures 1-2 As shown, an engine misfire detection instrument includes a male and female ignition coil connector, a housing 1, two ignition coil T-connectors 2, and a detection circuit. The two ignition coil T-connectors 2 are respectively connected to pins 1-4 of the male and female ignition coil connectors. The detection circuit includes circuits 1, 2, 3, and 4. Figure 1 (A, B, C, and D in the diagram) Line 1, Line 2, Line 3, and Line 4 are all connected to the male and female ignition coil connectors via two ignition coil tee plugs 2.

[0026] A 20mA digital DC ammeter 3, a first light-emitting diode 4, and a 5V DC battery 5 are connected in series on the first line. The first line is connected to the male and female pins of the ignition coil. The negative terminal of the 5V DC battery 5 is connected to a grounding wire 6.

[0027] The second line is electrically connected to a microcontroller 7 and a second light-emitting diode 8. The second line is connected to pin 2 of the male and female connectors of the ignition coil. The grounding terminal of the microcontroller 7 is connected to the ground wire 6.

[0028] The third line is directly connected to pin 3 of the male and female connectors of the ignition coil. The fourth line is connected to pin 3 of the male and female connectors of the ignition coil. The fourth line is divided into two paths. One path is connected in series with a 20A digital display ammeter 9 and a first self-locking switch 10. The other path is connected in series with a 100W-130W high-power bulb and a second self-locking switch 11.

[0029] The ignition coil three-way plug 2 includes a high-temperature resistant insulated plug. The four pins of the ignition coil three-way plug 2 are insulated. Insulating sleeves are provided on the outside of the first, second, third and fourth lines. The first, second, third and fourth lines are insulated through the insulating sleeves.

[0030] Line 1, Line 2, Line 3, and Line 4 are all made of copper wire with a thickness of 0.35mm-1.5mm.

[0031] The positive terminal of the first light-emitting diode 4 is connected to line 1, and the negative terminal is connected to the 20mA digital display DC ammeter 3. The 5V DC battery 5 supplies power to the 20mA digital display DC ammeter 3.

[0032] The first light-emitting diode 4 includes a common monochrome light-emitting diode.

[0033] The input terminal of the microcontroller 7 is connected to line number 2, the output terminal of the microcontroller 7 is connected to the positive terminal of the second light-emitting diode 8, and the negative terminal of the second light-emitting diode 8 is grounded.

[0034] The microcontroller 7 is powered by a 5V DC battery 5.

[0035] The grounding wire 6 includes a conductor and an iron clamp, the conductor and the iron clamp are connected, and the iron clamp is grounded.

[0036] The housing 1 is a hollow square structure. The housing 1 is hollow inside and a detection circuit is installed inside the housing 1. The housing 1 has a wire outlet hole. The upper end of the housing 1 has a window corresponding to the 20mA digital display DC ammeter 3 and the 20A digital display ammeter 9. The housing 1 has a button hole corresponding to the first self-locking switch 10 and the second self-locking switch 11.

[0037] In this embodiment, the microcontroller is a 51 microcontroller.

[0038] The ignition coil T-connector 2 is connected to pins 1-4 of the male and female connectors of the engine ignition coil, ensuring that lines 1, 2, 3, and 4 in the detection circuit are stably connected to the corresponding pins of the male and female connectors through the T-connector 2.

[0039] The ignition coil consists of a primary circuit and a secondary circuit. The primary and secondary coils are pressurized by induced electromotive force, which pressurizes the secondary circuit to a high voltage of nearly 10,000 volts. The spark plug breaks down the air between the center electrode and the side electrode, thereby igniting the circuit.

[0040] Static testing (engine off): Testing the primary power supply circuit of the ignition coil.

[0041] Press the button on housing 1 corresponding to the second self-locking switch 11 (controls the branch of circuit 4 connected in series with a 100W-130W high-power bulb), and observe the status of the 100W-130W high-power bulb: if it is continuously lit, it means that the primary circuit of the ignition coil is normal; if it is not lit or flashing, it means that there is a fault in the primary circuit.

[0042] Release the second self-locking switch 11 (disconnecting the bulb branch), press the button corresponding to the first self-locking switch 10 (controlling the branch in line 4 connected in series with the 20A digital ammeter 9), and observe the value of the 20A digital ammeter 9 in the viewing window of housing 1: if the ammeter displays 12A current, it indicates that the primary circuit current is normal; if the ammeter has no value or the value deviates from 12A, it indicates that there is a power supply abnormality. After the test is completed, release the first self-locking switch 10 to end the static test.

[0043] Dynamic detection (engine running status): detects control signals, secondary circuits, and spark plugs.

[0044] ECU control signal detection: Microcontroller 7 receives the ECU control signal and drives the second LED 8 according to the control signal. Observe the second LED 8 in the second circuit of housing 1. If the second LED 8 flashes regularly at a frequency of 50ms, it means that the actuation signal sent by the engine control unit (ECU) to the primary circuit of the ignition coil is normal. If the second LED 8 does not flash or the flashing frequency deviates from 50ms, it means that there is a fault in the ECU control circuit or the ECU itself. It is necessary to check the control circuit connection or the ECU status.

[0045] Secondary circuit and spark plug test: Observe the value of the 20mA digital DC ammeter 3 in the viewing window of housing 1 and the status of the first LED 4 of circuit 1. If the first LED 4 flashes regularly at a frequency of 50ms and the 20mA digital DC ammeter 3 displays a value of 5-6mA, it indicates that the secondary coil circuit of the ignition coil is unobstructed, the spark plug is working normally, and there is no fault.

[0046] If the 20mA digital DC ammeter 3 displays a value of 7-8mA, regardless of whether the first LED 4 is flashing, it indicates that there is a short circuit in the secondary coil circuit or the spark plug gap is too small. The secondary coil needs to be repaired or the spark plug needs to be replaced.

[0047] If the first LED 4 does not flash and the 20mA digital DC ammeter 3 shows no value, it indicates an open circuit in the secondary coil circuit or a complete spark plug failure, requiring replacement of the corresponding component. After the test is completed, turn off the engine.

[0048] If the static test (primary power supply line) and dynamic test (ECU control signal, secondary circuit and spark plugs) show normal readings for the 20mA digital DC ammeter 3, 20A digital ammeter 9, first LED 4, second LED 8, and high-power bulb (meeting the above normal judgment criteria), but the engine still exhibits vibration and misfiring, the ignition system fault can be directly ruled out, and the cause of the misfiring is determined to be from the engine fuel injection control circuit (such as fuel injector blockage or abnormal fuel injection circuit).

[0049] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. An engine misfire cause detector, comprising an ignition coil male connector and a female connector, characterized in that, It also includes a housing (1), two ignition coil three-way plugs (2) and a detection circuit. The two ignition coil three-way plugs (2) are respectively connected to pins 1-4 of the male and female ignition coil plugs. The detection circuit includes line 1, line 2, line 3 and line 4. Line 1, line 2, line 3 and line 4 are all connected to the male and female ignition coil plugs through the two ignition coil three-way plugs (2). A 20mA digital DC ammeter (3), a first light-emitting diode (4) and a 5V DC battery (5) are connected in series on the first line. The first line is connected to the male and female pins of the ignition coil. The negative terminal of the 5V DC battery (5) is connected to a grounding wire (6). The second line is electrically connected to a microcontroller (7) and a second light-emitting diode (8). The second line is connected to the male and female pins of the ignition coil. The grounding terminal of the microcontroller (7) is connected to the ground wire (6). The third line is directly connected to pin 3 of the male and female connectors of the ignition coil. The fourth line is connected to pin 3 of the male and female connectors of the ignition coil. The fourth line is divided into two paths. One path is connected in series with a 20A digital display ammeter (9) and a first self-locking switch (10). The other path is connected in series with a 100W-130W high-power bulb and a second self-locking switch (11).

2. The engine misfire cause detector according to claim 1, characterized in that, The ignition coil three-way plug (2) includes a high-temperature resistant insulated plug. The four pins of the ignition coil three-way plug (2) are insulated. Insulating sleeves are provided on the outside of the first line, the second line, the third line and the fourth line. The first line, the second line, the third line and the fourth line are insulated through the insulating sleeves.

3. The engine misfire cause detector according to claim 1, characterized in that, Line 1, Line 2, Line 3, and Line 4 are all made of copper wire with a thickness of 0.35mm-1.5mm.

4. The engine misfire cause detector according to claim 1, characterized in that, The positive terminal of the first light-emitting diode (4) is connected to line 1, and the negative terminal is connected to a 20mA digital display DC ammeter (3). A 5V DC battery (5) supplies power to the 20mA digital display DC ammeter (3). The first light-emitting diode (4) includes a common monochrome light-emitting diode.

5. The engine misfire cause detector according to claim 4, characterized in that, The input terminal of the microcontroller (7) is connected to line number 2, and the output terminal of the microcontroller (7) is connected to the positive terminal of the second light-emitting diode (8). The negative terminal of the second light-emitting diode (8) is grounded. The microcontroller (7) is powered by a 5V DC battery (5).

6. The engine misfire cause detector according to claim 1, characterized in that, The grounding wire (6) includes a conductor and an iron clamp, the conductor and the iron clamp are connected, and the iron clamp is grounded.

7. The engine misfire cause detector according to claim 1, characterized in that, The housing (1) is a hollow square structure. The housing (1) is hollow inside and a detection circuit is installed inside the housing (1). A wire outlet hole is opened on the housing (1). A window is opened on the upper end of the housing (1) corresponding to the 20mA digital display DC ammeter (3) and the 20A digital display ammeter (9). A button hole is provided corresponding to the first self-locking switch (10) and the second self-locking switch (11). A lamp hole is opened corresponding to the first light-emitting diode (4) and the second light-emitting diode (8).

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