Double-feedback ignition module and working method thereof

Abstract

The invention discloses a double-feedback ignition module and a working method thereof. The ignition module comprises a power supply processing unit, an ignition control unit, a signal current feedback unit and a primary current feedback unit, wherein the power supply processing unit is respectively connected with the ignition control unit, the signal current feedback unit and the primary current feedback unit; the ignition control unit is connected with the ignition IGBT and used for receiving an input EST signal and driving the ignition IGBT to be switched on or switched off according to the signal; the signal current feedback unit is connected with the emitting electrode of the ignition IGBT and is used for sampling and detecting the primary current of the ignition coil so as to control the magnitude of the input signal current; and the primary current feedback unit is connected with the emitting electrode of the ignition IGBT and is used for sampling and detecting the primary current of the ignition coil so as to output a feedback signal of the magnitude of the primary current to the ECU. The ignition coil feedback circuit has the signal current feedback function and the primary current feedback function at the same time, two feedback signals can be provided for an ECU to select, and the ECU can correctly judge the working state of an ignition coil.

Description

Technical Field

[0001] The invention relates to the technical field of electronic ignition control of automobile engines, and in particular to a dual-feedback ignition module and a working method thereof. Background Art

[0002] In the field of automobile engine electronic ignition control, ECU refers to the engine electronic control unit, and EST signal refers to the EST control signal output by ECU. The ignition module of the automobile engine control system controls the ignition coil for ignition according to the EST signal.

[0003] At present, in the automobile market, some mid-to-high-end models will add primary current feedback or signal current feedback functions to the ignition coil to provide feedback signals to the ECU so that the ECU can determine the working status of the ignition coil. Due to different automobile configurations and target markets, an OE model ignition coil may have one of the two feedback functions mentioned above, and the ECU can only detect one of the feedback signals. When the ECU can only detect signal current feedback, but the ignition coil is primary current feedback, it cannot match and reports a fault; when the ECU can only detect primary current feedback, but the ignition coil is signal current feedback, it cannot match and reports a fault. This has caused confusion in the aftermarket, and the problem of ignition coils and vehicle models not matching often occurs. Summary of the invention

[0004] The purpose of the present invention is to provide a dual-feedback ignition module and a working method thereof, which have both signal current feedback and primary current feedback functions, that is, to provide two feedback signals for ECU selection, and the two feedback signals do not interfere with each other, so that the ECU can correctly judge the working state of the ignition coil, ensure the normal and stable operation of the ignition coil, and can match different configurations of the same OE model and vehicle models in different markets, so as to avoid abnormal installation of the ignition coil due to problems such as vehicle configuration and target market.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] A dual-feedback ignition module comprises a power processing unit, an ignition control unit, a signal current feedback unit and a primary current feedback unit; wherein:

[0007] The power processing unit is connected to the ignition control unit, the signal current feedback unit, and the primary current feedback unit respectively;

[0008] An ignition control unit is connected to the ignition IGBT and is used to receive an input EST signal and drive the ignition IGBT to turn on or off according to the signal;

[0009] The signal current feedback unit is connected to the emitter of the ignition IGBT and is used to sample and detect the primary current of the ignition coil to control the magnitude of the input signal current so that the ECU can detect and determine whether the ignition coil is working normally;

[0010] The primary current feedback unit is connected to the emitter of the ignition IGBT and is used to sample and detect the primary current of the ignition coil to output a feedback signal of the primary current size to the ECU, so that the ECU can detect and determine whether the ignition coil is working normally.

[0011] Preferably, the signal current feedback unit includes a first comparator, a second transistor, a seventh resistor, and a ninth resistor; the out-of-phase end of the first comparator is connected to the emitter of the ignition IGBT; the first end of the seventh resistor and the first end of the ninth resistor are connected together and then connected to the in-phase end of the first comparator; the second end of the seventh resistor is connected to the power supply VCC end, and the second end of the ninth resistor is grounded; the output end of the first comparator is connected to the signal input end of the ignition control unit; the base and collector of the second transistor are respectively connected to the output end of the first comparator; and the emitter of the second transistor is grounded.

[0012] Preferably, the signal current feedback unit also includes a first resistor and a second resistor; the collector of the second transistor is connected in series with the first resistor and then connected to the output end of the first comparator; the base of the second transistor is connected in series with the second resistor and then connected to the output end of the first comparator.

[0013] Preferably, the primary current feedback unit includes a second comparator, a thirteenth resistor, a fourteenth resistor, a sixteenth resistor, a fifth capacitor, and a third zener diode; the first end of the thirteenth resistor and the first end of the fourteenth resistor are connected in common and then connected to the in-phase end of the second comparator; the out-of-phase end of the second comparator is connected to the emitter of the ignition IGBT; the second end of the thirteenth resistor is connected to the power supply VCC end, and the second end of the fourteenth resistor is grounded; the first end of the fifth capacitor, the first end of the sixteenth resistor, and the cathode of the third zener diode are connected in common and then connected to the output end of the second comparator; the second end of the fifth capacitor and the anode of the third zener diode are grounded; the second end of the sixteenth resistor is the primary current feedback signal output end.

[0014] Preferably, the ignition control unit includes an ignition control chip, a tenth resistor, and a fifteenth resistor; the Gate port of the ignition control chip is connected to the control electrode of the ignition IGBT via the fifteenth resistor; the emitter of the ignition IGBT is respectively connected to the signal current feedback unit and the primary current feedback unit via the tenth resistor.

[0015] Preferably, the power processing unit includes a fifth resistor, a fourth capacitor, and a second voltage-stabilizing diode; the first end of the fifth resistor, the first end of the fourth capacitor, and the cathode of the second voltage-stabilizing diode are connected to the power supply VCC terminal; the second end of the fifth resistor is connected to the power supply B+ terminal; the second end of the fourth capacitor and the anode of the second voltage-stabilizing diode are grounded.

[0016] A working method of a dual-feedback ignition module, applied to the dual-feedback ignition module, comprises the following steps:

[0017] Step S1: The ECU sends an EST signal, and the ignition control unit controls the ignition IGBT to turn on or off according to the signal;

[0018] Step S2: According to the feedback signal detection function of the ECU itself, select to enter step S3 to trigger the signal current feedback detection function, or select to enter step S4 to trigger the primary current feedback detection function;

[0019] Step S3: The signal current feedback unit samples the emitter of the ignition IGBT. When the sampling detects that the primary current is less than the first threshold, the EST signal is slightly lowered and then output to the ECU; when the sampling detects that the primary current is greater than the first threshold, the EST signal amplitude is restored to normal and then output to the ECU; thereby, the ECU can detect and determine whether the ignition coil is working normally;

[0020] Step S4: The primary current feedback unit samples the emitter of the ignition IGBT. When the sampling detects that the primary current is less than the second threshold, a high-level feedback signal is output to the ECU; when the sampling detects that the primary current is greater than the second threshold, a low-level feedback signal is output to the ECU; thereby, the ECU can detect and determine whether the ignition coil is working normally.

[0021] Preferably, the first threshold is greater than the second threshold.

[0022] By adopting the above scheme, the beneficial effects of the present invention are:

[0023] A dual-feedback ignition module and a working method thereof provided by the present invention have both signal current feedback and primary current feedback functions, that is, two feedback signals can be provided to the ECU for selection, and the two feedback signals do not interfere with each other, so that the ECU can correctly judge the working state of the ignition coil, ensure the normal and stable operation of the ignition coil, match different configurations of the same OE model and vehicle models in different markets, and avoid abnormal installation of the ignition coil due to problems such as vehicle configuration and target market. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a principle block diagram of the present invention;

[0025] Figure 2 It is a circuit diagram of an ignition control unit and a signal current feedback unit of the present invention;

[0026] Figure 3 is a circuit diagram of a primary current feedback unit of the present invention;

[0027] Figure 4 is a circuit diagram of a power processing unit of the present invention;

[0028] Figure 5 It is a flow chart of the working method of the ignition module of the present invention;

[0029] Figure 6 (a) is the waveform of EST signal;

[0030] Figure 6 (b) is the signal current feedback waveform;

[0031] Figure 6 (c) is the primary current waveform;

[0032] Figure 6 (d) is the waveform of the primary current feedback signal;

[0033] The accompanying drawings illustrate:

[0034] 1—Power processing unit, 2—Ignition control unit,

[0035] 3—Signal current feedback unit, 4—Primary current feedback unit,

[0036] 5—Ignition IGBT, 6—Ignition coil. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] Reference Figures 1 to 6 As shown, the present invention provides a dual-feedback ignition module, including a power processing unit 1, an ignition control unit 2, a signal current feedback unit 3 and a primary current feedback unit 4; wherein: the power processing unit 1 is connected to the ignition control unit 2, the signal current feedback unit 3 and the primary current feedback unit 4 respectively; the ignition control unit 2 is connected to the ignition IGBT 5, for receiving an input EST signal, and driving the ignition IGBT 5 to turn on or off according to the signal; the signal current feedback unit 3 is connected to the emitter of the ignition IGBT 5, for sampling and detecting the primary current of the ignition coil 6 to control the magnitude of the input signal current, so that the ECU can detect and determine whether the ignition coil 6 is working normally; the primary current feedback unit 4 is connected to the emitter of the ignition IGBT 5, for sampling and detecting the primary current of the ignition coil 6 to output a feedback signal of the primary current magnitude to the ECU, so that the ECU can detect and determine whether the ignition coil 6 is working normally.

[0041] In addition, a working method of a dual feedback ignition module is provided, which is applied to the dual feedback ignition module and comprises the following steps:

[0042] Step S1: The ECU sends an EST signal, and the ignition control unit 2 controls the ignition IGBT 5 to turn on or off according to the signal;

[0043] Step S2: According to the feedback signal detection function of the ECU itself, select to enter step S3 to trigger the signal current feedback detection function, or select to enter step S4 to trigger the primary current feedback detection function;

[0044] Step S3: the signal current feedback unit 3 samples the emitter of the ignition IGBT 5. When the sampling detects that the primary current is less than the first threshold, the EST signal is slightly lowered and then output to the ECU; when the sampling detects that the primary current is greater than the first threshold, the EST signal amplitude is restored to normal and then output to the ECU; thereby, the ECU can detect and determine whether the ignition coil 6 is working normally;

[0045] Step S4: The primary current feedback unit 4 samples the emitter of the ignition IGBT 5. When the sampling detects that the primary current is less than the second threshold, a high-level feedback signal is output to the ECU; when the sampling detects that the primary current is greater than the second threshold, a low-level feedback signal is output to the ECU; thereby, the ECU can detect and determine whether the ignition coil 6 is working normally.

[0046] The first threshold is greater than the second threshold.

[0047] Signal current feedback unit 3:

[0048] The signal current feedback unit 3 includes a first comparator U2A, a second transistor Q2, a seventh resistor R7, and a ninth resistor R9; the out-of-phase end of the first comparator U2A is connected to the emitter of the ignition IGBT 5; the first end of the seventh resistor R7 and the first end of the ninth resistor R9 are connected together and then connected to the in-phase end of the first comparator U2A; the second end of the seventh resistor R7 is connected to the power supply VCC end, and the second end of the ninth resistor R9 is grounded; the output end of the first comparator U2A is connected to the signal input end of the ignition control unit 2; the base and collector of the second transistor Q2 are respectively connected to the output end of the first comparator U2A; the emitter of the second transistor Q2 is grounded.

[0049] The signal current feedback unit 3 also includes a first resistor R1 and a second resistor R2; the collector of the second transistor Q2 is connected in series with the first resistor R1 and then connected to the output end of the first comparator U2A; the base of the second transistor Q2 is connected in series with the second resistor R2 and then connected to the output end of the first comparator U2A.

[0050] The seventh resistor R7 and the ninth resistor R9 are connected in series to set the bias voltage of the in-phase terminal of the first comparator U2A. The working process is as follows: Figure 6 As shown in (a), (b), and (c):

[0051] When the primary current detected by sampling is less than the first threshold, V ref is smaller than the bias voltage of the seventh resistor R7 and the ninth resistor R9 connected in series, the output terminal of the first comparator U2A outputs a high level, the second transistor Q2 is in the on state, and the EST signal is slightly pulled down. At this time, the signal current is large;

[0052] When the primary current detected by sampling is greater than the first threshold, V ref The voltage is greater than the bias voltage of the seventh resistor R7 and the ninth resistor R9 connected in series. The output end of the first comparator U2A outputs a low level. The second transistor Q2 is in a closed state. The amplitude of the EST signal returns to normal. At this time, the signal current is small.

[0053] The signal current feedback unit 3 samples the current of the ignition IGBT 5, processes it through the combination of the first comparator U2A and the second transistor Q2, controls the input signal current, and feeds it back to the ECU. The ECU determines whether the ignition coil 6 is working normally by detecting the change of the signal current.

[0054] In a specific embodiment, the first threshold is the signal current feedback point, that is, point B. Assuming that the current value corresponding to point B is 6A and the time value is 2.2ms, that is, when the conduction time corresponding to point B is 2.2ms, the corresponding primary current reaches 6A, so that the signal current feedback waveform has a rising edge, which actually means that the signal current changes. When the ECU detects this change, that is, the ECU detects that the conduction time is 2.2ms and the primary current reaches 6A, it is judged that the ignition coil 6 is working normally. In actual applications, the current at point B is a range of 5-7A. When the ECU does not detect the rising edge, or the rising edge appears too early or too late (indicating that the current is less than 5A or the current is greater than 7A when the conduction time is 2.2ms), it is judged that the ignition coil 6 is abnormal.

[0055] Primary current feedback unit 4:

[0056] The primary current feedback unit 4 includes a second comparator U2B, a thirteenth resistor R13, a fourteenth resistor R14, a sixteenth resistor R16, a fifth capacitor C5, and a third voltage-stabilizing diode D3; the first end of the thirteenth resistor R13 and the first end of the fourteenth resistor R14 are connected together and then connected to the in-phase end of the second comparator U2B; the out-of-phase end of the second comparator U2B is connected to the emitter of the ignition IGBT 5; the second end of the thirteenth resistor R13 is connected to the power supply VCC end, and the second end of the fourteenth resistor R14 is grounded; the first end of the fifth capacitor C5, the first end of the sixteenth resistor R16, and the cathode of the third voltage-stabilizing diode D3 are connected together and then connected to the output end of the second comparator U2B; the second end of the fifth capacitor C5 and the anode of the third voltage-stabilizing diode D3 are grounded; the second end of the sixteenth resistor R16 is the primary current feedback signal output end.

[0057] The thirteenth resistor R13 and the fourteenth resistor R14 are connected in series to set the bias voltage of the in-phase terminal of the second comparator U2B, the fifth capacitor C5 is the feedback output filter capacitor, the third voltage regulator diode D3 is the feedback terminal voltage regulator diode, the sixteenth resistor R16 is the feedback terminal protection resistor, and I GF It is the feedback output port. In the car, it is pulled up to the power supply through a 1kΩ resistor. In one ignition cycle, the working process is as follows: Figure 6 As shown in (a), (c) and (d):

[0058] When the primary current detected by sampling is less than the second threshold, V refis less than the bias voltage of the thirteenth resistor R13 and the fourteenth resistor R14 connected in series, the output terminal of the second comparator U2B outputs a high level, I GF The feedback signal is pulled up to the power supply through a 1kΩ resistor and is high level.

[0059] When the sampled primary current is greater than the second threshold, Vref is higher than the bias voltage of the thirteenth resistor R13 and the fourteenth resistor R14 connected in series, and the output terminal of the second comparator U2B outputs a low level. GF The feedback signal is forced low.

[0060] When the primary current is turned off, the primary current is 0A, and the primary current detected by sampling is less than the second threshold again, V ref The output terminal of the second comparator U2B outputs a high level, and I GF The feedback signal is pulled up to the power supply through a 1kΩ resistor and is high level.

[0061] The primary current feedback unit 4 samples the current of the ignition IGBT 5, processes it through the second comparator U2B, and outputs the primary current feedback to the ECU. Please continue to refer to Figure 6 The primary current feedback signal waveform shown in (d) is used by the ECU to determine whether the ignition coil 6 is working normally by detecting changes in the primary current feedback signal waveform.

[0062] In a specific embodiment, the second threshold is the primary current feedback point, i.e., point A. Assuming that the primary current corresponding to point A is 4.8A, the time value is 1.6ms, i.e., when the conduction time corresponding to point A is 1.6ms, the primary current reaches 4.8A, so that the waveform of the primary current feedback signal has a falling edge. When the ECU detects this falling edge, i.e., at this time, the ECU detects that the conduction time is 1.6ms and the primary current reaches 4.8A, thus determining that the ignition coil 6 is working normally. In practical applications, the current at point A is in the range of 4-5.6A. When the ECU does not detect the falling edge, or the falling edge appears too early or too late (indicating that the current is less than 4A or the current is greater than 5.6A when the conduction time is 1.6ms), it is determined that the ignition coil 6 is abnormal.

[0063] Ignition control unit 2:

[0064] The ignition control unit 2 includes an ignition control chip U1, a tenth resistor R10, and a fifteenth resistor R15; the Gate port of the ignition control chip U1 is connected to the control electrode of the ignition IGBT 5 via the fifteenth resistor R15; the emitter of the ignition IGBT 5 is connected to the signal current feedback unit 3 and the primary current feedback unit 4 respectively via the tenth resistor R10.

[0065] The ignition control unit 2 also includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a third resistor R3, a fourth resistor R4, a sixth resistor R6, an eighth resistor R8, an eleventh resistor R11, and a twelfth resistor R12; wherein the first end of the first capacitor C1 is connected to the first end of the third resistor R3 and then connected to the EST signal input terminal, the second end of the third resistor R3 is connected to the IN port of the ignition control chip U1, and the second end of the first capacitor C1 is grounded. The first end of the second capacitor C2 is connected to the CSSD port of the ignition control chip U1, and the second end of the second capacitor C2 is grounded. The first end of the third capacitor C3 is connected to the first end of the fourth resistor R4 and then connected to the VS port of the ignition control chip U1, the second end of the third capacitor C3 is grounded, and the second end of the fourth resistor R4 is connected to the power supply B+ terminal. The first end of the sixth resistor R6 is connected to the RA port of the ignition control chip U1, and the second end is grounded. The first end of the eighth resistor R8 and the first end of the eleventh resistor R11 are connected to the Sense port of the ignition control chip U1, the second end of the eighth resistor R8 is connected to the emitter of the ignition IGBT 5, and the second end of the eleventh resistor R11 is grounded. The first end of the twelfth resistor R12 is connected to the emitter of the ignition IGBT 5, and the second end is grounded.

[0066] The function of the ignition control unit 2 revolves around the ignition control chip U1, wherein the first capacitor C1 is a signal filtering capacitor, the second capacitor C2 is a time protection duration setting capacitor, the third capacitor C3 is a power supply filtering capacitor, the third resistor R3 is a chip input port protection resistor, the fourth resistor R4 is a chip power port protection resistor, the sixth resistor R6 is used to set the initial chip input signal current, the fifteenth resistor R15 is a chip drive output port protection resistor, the eighth resistor R8, the eleventh resistor R11 and the twelfth resistor R12 are combined to set the module primary current limiting, the tenth resistor R10 is for the signal current feedback unit 3, the comparator input port of the primary current feedback unit 4 to provide protection, V ref is the primary current sampling point voltage.

[0067] Power Processing Unit 1:

[0068] The power processing unit 1 includes a fifth resistor R5, a fourth capacitor C4, and a second Zener diode D2; the first end of the fifth resistor R5, the first end of the fourth capacitor C4, and the cathode of the second Zener diode D2 are connected to the power supply VCC terminal; the second end of the fifth resistor R5 is connected to the power supply B+ terminal; the second end of the fourth capacitor C4 and the anode of the second Zener diode D2 are grounded.

[0069] Provide power and comparison bias voltage to the comparator of the signal current feedback unit 3 and the primary current feedback unit 4. The fifth resistor R5 is a current limiting voltage dividing resistor, and the fourth capacitor C4 is a filter capacitor.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A dual feedback ignition module, characterized in that: It includes a power processing unit, an ignition control unit, a signal current feedback unit and a primary current feedback unit; wherein: The power processing unit is connected to the ignition control unit, the signal current feedback unit, and the primary current feedback unit respectively; An ignition control unit is connected to the ignition IGBT and is used to receive an input EST signal and drive the ignition IGBT to turn on or off according to the signal; The signal current feedback unit is connected to the emitter of the ignition IGBT and is used to sample and detect the primary current of the ignition coil to control the magnitude of the input signal current so that the ECU can detect and determine whether the ignition coil is working normally; The primary current feedback unit is connected to the emitter of the ignition IGBT and is used to sample and detect the primary current of the ignition coil to output a feedback signal of the primary current size to the ECU, so that the ECU can detect and determine whether the ignition coil is working normally.

2. The dual feedback ignition module according to claim 1, characterized in that: The signal current feedback unit includes a first comparator, a second transistor, a seventh resistor, and a ninth resistor; the out-of-phase end of the first comparator is connected to the emitter of the ignition IGBT; the first end of the seventh resistor and the first end of the ninth resistor are connected together and then connected to the in-phase end of the first comparator; the second end of the seventh resistor is connected to the power supply VCC end, and the second end of the ninth resistor is grounded; the output end of the first comparator is connected to the signal input end of the ignition control unit; the base and collector of the second transistor are respectively connected to the output end of the first comparator; and the emitter of the second transistor is grounded.

3. The dual feedback ignition module according to claim 2, characterized in that: The signal current feedback unit also includes a first resistor and a second resistor; the collector of the second transistor is connected in series with the first resistor and then connected to the output end of the first comparator; the base of the second transistor is connected in series with the second resistor and then connected to the output end of the first comparator.

4. The dual feedback ignition module according to claim 1, characterized in that: The primary current feedback unit includes a second comparator, a thirteenth resistor, a fourteenth resistor, a sixteenth resistor, a fifth capacitor, and a third zener diode; the first end of the thirteenth resistor and the first end of the fourteenth resistor are connected together and then connected to the in-phase end of the second comparator; the out-of-phase end of the second comparator is connected to the emitter of the ignition IGBT; the second end of the thirteenth resistor is connected to the power supply VCC end, and the second end of the fourteenth resistor is grounded; the first end of the fifth capacitor, the first end of the sixteenth resistor, and the cathode of the third zener diode are connected together and then connected to the output end of the second comparator; the second end of the fifth capacitor and the anode of the third zener diode are grounded; the second end of the sixteenth resistor is the primary current feedback signal output end.

5. The dual feedback ignition module according to claim 1, characterized in that: The ignition control unit includes an ignition control chip, a tenth resistor, and a fifteenth resistor; the Gate port of the ignition control chip is connected to the control electrode of the ignition IGBT via the fifteenth resistor; the emitter of the ignition IGBT is connected to the signal current feedback unit and the primary current feedback unit respectively via the tenth resistor.

6. The dual feedback ignition module according to claim 1, characterized in that: The power processing unit includes a fifth resistor, a fourth capacitor, and a second voltage-stabilizing diode; the first end of the fifth resistor, the first end of the fourth capacitor, and the cathode of the second voltage-stabilizing diode are connected to the power supply VCC terminal; the second end of the fifth resistor is connected to the power supply B+ terminal; the second end of the fourth capacitor and the anode of the second voltage-stabilizing diode are grounded.

7. A working method of a dual feedback ignition module, applied to the dual feedback ignition module according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1: The ECU sends an EST signal, and the ignition control unit controls the ignition IGBT to turn on or off according to the signal; Step S2: According to the feedback signal detection function of the ECU itself, select to enter step S3 to trigger the signal current feedback detection function, or select to enter step S4 to trigger the primary current feedback detection function; Step S3: The signal current feedback unit samples the emitter of the ignition IGBT. When the sampling detects that the primary current is less than the first threshold, the EST signal is slightly lowered and then output to the ECU; when the sampling detects that the primary current is greater than the first threshold, the EST signal amplitude is restored to normal and then output to the ECU; thereby, the ECU can detect and determine whether the ignition coil is working normally; Step S4: The primary current feedback unit samples the emitter of the ignition IGBT. When the sampling detects that the primary current is less than the second threshold, a high-level feedback signal is output to the ECU; when the sampling detects that the primary current is greater than the second threshold, a low-level feedback signal is output to the ECU; thereby, the ECU can detect and determine whether the ignition coil is working normally.

8. The working method of the dual feedback ignition module according to claim 7, characterized in that: The first threshold is greater than the second threshold.

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