HCS08SG-based secondary ignition circuit and method

Abstract

The invention discloses a secondary ignition circuit and method based on HCS08SG. The secondary ignition circuit comprises a power supply processing module, a signal processing module, an IGBT (Insulated Gate Bipolar Translator) driving module, a sampling module and an HCS08SG single chip microcomputer, wherein the power supply processing module is used for supplying power to the whole circuit; the signal processing module is connected between the ECU and the HCS08SG single-chip microcomputer and used for collecting ECU signals, processing the ECU signals and outputting the ECU signals to the HCS08SG single-chip microcomputer; the IGBT driving module is connected between the HCS08SG single chip microcomputer and an IGBT and is used for driving the IGBT to carry out first ignition and second ignition according to the control signal of the HCS08SG single chip microcomputer; the sampling module is connected between the HCS08SG single chip microcomputer and the IGBT and is used for detecting the primary current flowing through the IGBT and feeding back the detected current information to the HCS08SG single chip microcomputer; the HCS08SG single chip microcomputer is used for outputting a control signal to control the IGBT driving module to drive the IGBT to perform first ignition; after the first ignition, the HCS08SG single-chip microcomputer performs sampling detection at the emitting electrode of the IGBT through the sampling module; when it is detected that the primary current of the IGBT is reduced, the HCS08SG single-chip microcomputer delays for a certain time and then outputs a control signal to control the IGBT driving module to drive the IGBT to conduct secondary ignition. According to the invention, the ignition coil can perform secondary ignition, so that the ignition coil can still provide relatively high energy at a low rotating speed, fuel oil is combusted more sufficiently, the fuel oil combustion rate and ignition energy are improved, better power is provided, the ignition stability of an engine is maintained, and the oil consumption and emission performance of the engine are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic ignition control of automobile engines, and in particular to a secondary ignition circuit and method based on HCS08SG. Background Art

[0002] In the field of electronic ignition control of automobile engines, ECU refers to the electronic control unit of the engine, and ECU signal refers to the EST control signal output by ECU. The ignition module of the automobile engine control system controls the ignition coil to ignite according to the ECU signal. In the ignition module, the IGBT drive module receives the ECU signal, controls the conduction and cutoff of the IGBT, and then controls the current of the primary winding of the ignition coil, which ultimately affects the high voltage generated by the secondary winding of the ignition coil to achieve ignition control.

[0003] The existing automobile engine control system has a single ignition system and a multiple ignition system: In the single ignition system, please refer to Figure 1 In (a), when the ECU sends an ignition signal (ECU signal), the ignition module controls the ignition coil to ignite once according to the ECU signal; in a multiple ignition system, please refer to Figure 1 In (b), after the ECU sends out multiple ignition signals, the multiple ignition module controls the ignition coil to perform multiple ignitions according to the multiple ignition signals, such as the Daimler multiple ignition system, the Delphi ACI multiple ignition system, etc.

[0004] However, in actual applications, the single-shot ignition system only ignites once, which can easily cause engine vibration and cylinder failure when the engine speed is low or the ignition advance angle and air-fuel ratio deviate from the optimal ignition ratio; while the multiple-shot ignition system requires ECU cooperation and is used on specific models, such as Mercedes-Benz, BMW, etc. In addition, some high-performance models with single-shot ignition systems also require the ignition coil to have higher energy when the speed is low, and the use of conventional single-shot ignition coils or multiple-shot ignition coils cannot meet the requirements. Summary of the invention

[0005] The purpose of the present invention is to provide a secondary ignition circuit and method based on HCS08SG. In a single ignition system, the ignition coil can be secondary ignited through the control of the HCS08SG single chip microcomputer and the HCS08SG single chip microcomputer samples and detects the primary current at the emitter of the IGBT through a sampling module, so that the ignition coil can still provide higher energy at low speed, so that the fuel burns more completely, the fuel combustion rate and ignition energy are improved, better power is provided, the engine ignition stability is maintained, and the engine fuel consumption and emission performance are improved.

[0006] In order to achieve the above purpose, the following technical solutions are adopted:

[0007] A secondary ignition circuit based on HCS08SG includes a power processing module, a signal processing module, an IGBT driving module, a sampling module, and an HCS08SG single chip microcomputer; wherein:

[0008] A power processing module, used to supply power to the entire circuit;

[0009] The signal processing module is connected between the ECU and the HCS08SG microcontroller, and is used to collect ECU signals and output them to the HCS08SG microcontroller after processing;

[0010] The IGBT driving module is connected between the HCS08SG single-chip microcomputer and the IGBT, and is used to drive the IGBT to perform the first ignition and the second ignition according to the control signal of the HCS08SG single-chip microcomputer;

[0011] The sampling module is connected between the HCS08SG microcontroller and the IGBT, and is used to detect the primary current flowing through the IGBT and feed back the detected current information to the HCS08SG microcontroller;

[0012] The HCS08SG single-chip microcomputer is used to output a control signal to control the IGBT driver module to drive the IGBT for the first ignition; after the first ignition, the HCS08SG single-chip microcomputer samples and detects at the emitter of the IGBT through the sampling module; when it is detected that the primary current of the IGBT drops, the HCS08SG single-chip microcomputer outputs a control signal after a certain delay to control the IGBT driver module to drive the IGBT for the second ignition.

[0013] Preferably, the sampling module comprises a fifteenth resistor; a first end of the fifteenth resistor is connected to a PTA0 / ACMP+ pin of a HCS08SG microcontroller; and a second end of the fifteenth resistor is connected to an emitter of an IGBT.

[0014] Preferably, the IGBT drive module includes a drive unit, a long-time protection unit, and a current limiting protection unit; the drive unit is connected to the control electrode of the IGBT to drive the IGBT to work; the long-time protection unit is used to prevent the IGBT from being damaged by transient overheating due to signal abnormalities, and the current limiting protection unit is used to limit the current passing through the IGBT.

[0015] Preferably, the driving unit includes a dual comparator U3A, a tenth resistor, and an eleventh resistor; the non-phase input terminal of the dual comparator U3A is connected to the PTB5 pin of the HCS08SG microcontroller; the first end of the tenth resistor and the first end of the eleventh resistor are connected to the output terminal of the dual comparator U3A; the second end of the tenth resistor and the positive power supply terminal of the dual comparator U3A are connected to the power processing module; the second end of the eleventh resistor is connected to the control electrode of the IGBT.

[0016] Preferably, the long time protection unit includes a ninth resistor, a seventh capacitor, an eighth capacitor, and a second diode; the first end of the ninth resistor, the first end of the seventh capacitor, the first end of the eighth capacitor, and the anode of the second diode are connected to the inverting input end of the dual comparator U3A; the second end of the ninth resistor is connected to the power processing module; the second end of the seventh capacitor is connected to the output end of the dual comparator U3A; the second end of the eighth capacitor is grounded; and the cathode of the second diode is connected to the PTB5 pin of the HCS08SG microcontroller.

[0017] Preferably, the current limiting protection unit includes a sixth reference voltage source, a thirteenth resistor, a fourteenth resistor, and a sixteenth resistor; the first end of the thirteenth resistor and the first end of the sixteenth resistor are connected to the reference end of the sixth reference voltage source; the second end of the sixteenth resistor and the first end of the fourteenth resistor are connected to the emitter of the IGBT; the negative electrode of the sixth reference voltage source and the second end of the thirteenth resistor are connected to the output end of the dual comparator U3A; the positive electrode of the sixth reference voltage source and the second end of the fourteenth resistor are grounded.

[0018] Preferably, the signal processing module includes a dual comparator U3B, a first resistor, a second resistor, a third resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor; the first end of the first resistor and the first end of the fifth resistor are connected to the non-inverting input of the dual comparator U3B; the second end of the first resistor, the first end of the third resistor, and the first end of the sixth resistor are connected to the output of the dual comparator U3B; the second end of the sixth resistor is connected to the PTB4 pin of the HCS08SG microcontroller; the second end of the fifth resistor and the first end of the seventh resistor are connected to the ECU signal input; the first end of the second resistor and the first end of the eighth resistor are connected to the inverting input of the dual comparator U3B; the second end of the second resistor and the second end of the third resistor are connected to the power processing module; the second end of the seventh resistor and the second end of the eighth resistor are grounded.

[0019] Preferably, the power processing module includes a seventeenth resistor, a fourth capacitor, a second switching transistor, a fourth voltage-stabilizing diode, a third diode, a twelfth resistor, a first TVS tube, and a first capacitor; the first end of the fourth capacitor and the first end of the seventeenth resistor are connected to the emitter of the second switching transistor; the cathode of the fourth voltage-stabilizing diode and the first end of the twelfth resistor are connected to the control electrode of the second switching transistor; the cathode of the third diode is connected to the collector of the second switching transistor; the second end of the seventeenth resistor is connected to the VDD pin of the HCS08SG microcontroller; the second end of the twelfth resistor, the cathode of the first TVS tube, the first end of the first capacitor, and the anode of the third diode are connected to the positive electrode of the power supply; the second end of the fourth capacitor, the anode of the fourth voltage-stabilizing diode, the anode of the first TVS tube, and the second end of the first capacitor are grounded.

[0020] Preferably, the RESET pin of the HCS08SG microcontroller is connected to the first end of the fourth resistor and the first end of the fifth capacitor; the second end of the fourth resistor is connected to the VDD pin of the HCS08SG microcontroller; and the second end of the fifth capacitor is grounded.

[0021] In addition, a secondary ignition method based on HCS08SG is also provided, which is applied to the secondary ignition circuit based on HCS08SG, and includes the following steps:

[0022] Step S1: ECU sends out an ignition signal, which is collected and processed by the signal processing module and then transmitted to the HCS08SG microcontroller;

[0023] Step S2: After the HCS08SG single chip microcomputer has identified and processed the signal, it outputs a control signal to control the IGBT drive module to drive the IGBT to ignite for the first time;

[0024] Step S3: After the first ignition, the HCS08SG microcontroller samples the emitter of the IGBT through the sampling module to detect the primary current of the IGBT; if it is detected that the primary current of the IGBT decreases, step S4 is performed; if it is not detected that the primary current of the IGBT decreases, the primary current of the IGBT continues to be detected;

[0025] Step S4: After a certain delay, the HCS08SG single chip microcomputer outputs a control signal to control the IGBT drive module to drive the IGBT to ignite for the second time.

[0026] By adopting the above scheme, the beneficial effects of the present invention are:

[0027] In the single-shot ignition system, the ignition coil can perform secondary ignition through the control of the HCS08SG microcontroller and the sampling module of the HCS08SG microcontroller to sample and detect the primary current at the emitter of the IGBT, so that the ignition coil can still provide higher energy at low speeds, making the fuel burn more fully, improving the fuel combustion rate and ignition energy, providing better power, maintaining the engine ignition stability, and improving the engine fuel consumption and emission performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 (a) is the waveform of ECU signal in single ignition system;

[0029] Figure 1 (b) is the waveform of ECU signal in the multiple ignition system;

[0030] Figure 2 It is a principle block diagram of the secondary ignition circuit of the present invention;

[0031] Figure 3 It is the secondary ignition circuit diagram of the present invention;

[0032] Figure 4 It is a flow chart of the secondary ignition method of the present invention;

[0033] Figure 5 This is a waveform diagram of the primary current of secondary ignition in a single ignition system of the present invention;

[0034] The accompanying drawings illustrate:

[0035] 1—Power processing module, 2—Signal processing module,

[0036] 3—IGBT drive module, 4—sampling module,

[0037] 5—HCS08SG MCU, 6—IGBT,

[0038] 31—driving unit, 32—long time protection unit,

[0039] 33—Current limiting protection unit. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Reference Figures 1 to 3 As shown, the present invention provides a secondary ignition circuit based on HCS08SG, including a power processing module 1, a signal processing module 2, an IGBT driving module 3, a sampling module 4, and an HCS08SG single-chip microcomputer 5; wherein: the power processing module 1 is used to supply power to the entire circuit; the signal processing module 2 is connected between the ECU and the HCS08SG single-chip microcomputer 5, and is used to collect ECU signals and output them to the HCS08SG single-chip microcomputer 5 after processing; the IGBT driving module 3 is connected between the HCS08SG single-chip microcomputer 5 and the IGBT 6, and is used to drive the IGBT 6 to perform the first ignition and the second ignition according to the control signal of the HCS08SG single-chip microcomputer 5; the sampling module 4 is connected between the HCS08SG single-chip microcomputer 5 and the IGBT 6, and is used to detect the primary current flowing through the IGBT 6, and feed back the detected current information to the HCS08SG single-chip microcomputer 5; the HCS08SG single-chip microcomputer 5 is used to output a control signal to control the IGBT driving module 3 to drive the IGBT 6 performs the first ignition; after the first ignition, the HCS08SG single-chip microcomputer 5 samples and detects at the emitter of IGBT 6 through the sampling module 4; when it is detected that the primary current of IGBT 6 decreases, the HCS08SG single-chip microcomputer 5 delays for a certain period of time (the duration is designed according to the vehicle model requirements) and then outputs a control signal to control the IGBT driving module 3 to drive IGBT 6 for the second ignition.

[0044] Sampling module 4:

[0045] The sampling module 4 includes a fifteenth resistor R15 ; a first end of the fifteenth resistor R15 is connected to the PTA0 / ACMP+ pin of the HCS08SG microcontroller 5 ; and a second end of the fifteenth resistor R15 is connected to the emitter of the IGBT 6 .

[0046] IGBT driver module 3:

[0047] The IGBT driving module 3 includes a driving unit 31, a long-time protection unit 32, and a current limiting protection unit 33; the driving unit 31 is connected to the control electrode of the IGBT 6 to drive the IGBT 6 to work; the long-time protection unit 32 is used to prevent the IGBT 6 from being turned on for a long time due to overheating transient damage when the signal is abnormally in a long-time conduction state, that is, permanent conduction protection; the current limiting protection unit 33 is used to limit the current passing through the IGBT 6.

[0048] The driving unit 31 includes a dual comparator U3A, a tenth resistor R10, and an eleventh resistor R11; the tenth resistor R10 is a collector output pull-up resistor, and the eleventh resistor R11 is a protection resistor. The positive input end of the dual comparator U3A is connected to the PTB5 pin of the HCS08SG single-chip computer 5; the first end of the tenth resistor R10 and the first end of the eleventh resistor R11 are connected to the output end of the dual comparator U3A; the second end of the tenth resistor R10 and the positive power supply end of the dual comparator U3A are connected to the power processing module 1; the second end of the eleventh resistor R11 is connected to the control electrode of the IGBT.

[0049] The long time protection unit 32 includes a ninth resistor R9, a seventh capacitor C7, an eighth capacitor C8, and a second diode D2; the first end of the ninth resistor R9, the first end of the seventh capacitor C7, the first end of the eighth capacitor C8, and the anode of the second diode D2 are connected to the inverting input end of the dual comparator U3A; the second end of the ninth resistor R9 is connected to the power processing module 1; the second end of the seventh capacitor C7 is connected to the output end of the dual comparator U3A; the second end of the eighth capacitor C8 is grounded; the cathode of the second diode D2 is connected to the PTB5 pin of the HCS08SG microcontroller 5.

[0050] The current limiting protection unit 33 includes a sixth reference voltage source D6, a thirteenth resistor R13, a fourteenth resistor R14, and a sixteenth resistor R16; the thirteenth resistor R13 and the sixteenth resistor R16 are current limiting resistors, and the fourteenth resistor R14 is a sampling resistor. The first end of the thirteenth resistor R13 and the first end of the sixteenth resistor R16 are connected to the reference end of the sixth reference voltage source D6; the second end of the sixteenth resistor R16 and the first end of the fourteenth resistor R14 are connected to the emitter of the IGBT 6; the negative electrode of the sixth reference voltage source D6 and the second end of the thirteenth resistor R13 are connected to the output end of the dual comparator U3A; the positive electrode of the sixth reference voltage source D6 and the second end of the fourteenth resistor R14 are grounded.

[0051] The HCS08SG microcontroller 5 recognizes and processes the input signal and then outputs the control signal. After being processed by the dual comparator U3A, the output drives the IGBT 6. At the same time, the emitter of the IGBT 6 is sampled and fed back to the HCS08SG microcontroller 5 through the fifteenth resistor R15. When the primary current of the primary ignition is detected to drop, the HCS08SG microcontroller 5 outputs the control signal again after an appropriate delay, so that the IGBT 6 is turned on for secondary ignition. The output of the HCS08SG microcontroller 5 is processed by the dual comparator U3A to improve the driving capability of the IGBT 6. At the same time, the long-term protection unit 32 and the current limiting protection unit 33 of the discrete device are used to reduce the operation of the HCS08SG microcontroller 5, simplify the module software logic control, and improve the product reliability.

[0052] Signal processing module 2:

[0053] The signal processing module 2 includes a dual comparator U3B, a first resistor R1, a second resistor R2, a third resistor R3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8; the seventh resistor R7 is a signal input impedance matching resistor, the fifth resistor R5 and the sixth resistor R6 are protection resistors, the first resistor R1, the second resistor R2, and the eighth resistor R8 are switch signal setting resistors, and the third resistor R3 is a collector output pull-up resistor.

[0054] The first end of the first resistor R1 and the first end of the fifth resistor R5 are connected to the non-inverting input terminal of the dual comparator U3B; the second end of the first resistor R1, the first end of the third resistor R3, and the first end of the sixth resistor R6 are connected to the output terminal of the dual comparator U3B; the second end of the sixth resistor R6 is connected to the PTB4 pin of the HCS08SG microcontroller 5; the second end of the fifth resistor R5 and the first end of the seventh resistor R7 are connected to the ECU signal input terminal; the first end of the second resistor R2 and the first end of the eighth resistor R8 are connected to the inverting input terminal of the dual comparator U3B; the second end of the second resistor R2 and the second end of the third resistor R3 are connected to the power processing module 1; the second end of the seventh resistor R7 and the second end of the eighth resistor R8 are grounded.

[0055] The dual comparator U3B is used to avoid the influence of the sampling of the HCS08SG microcontroller 5 when there is interference in the signal, and it also plays a role in protecting the HCS08SG microcontroller 5.

[0056] Power processing module 1:

[0057] The power processing module 1 includes a seventeenth resistor R17, a fourth capacitor C4, a second switch transistor Q2, a fourth voltage regulator D4, a third diode D3, a twelfth resistor R12, a first TVS tube D1, and a first capacitor C1; the twelfth resistor R12 is a surge protection resistor, and the seventeenth resistor R17 is a current limiting protection resistor.

[0058] The first end of the fourth capacitor C4 and the first end of the seventeenth resistor R17 are connected to the emitter of the second switch transistor Q2; the cathode of the fourth voltage regulator D4 and the first end of the twelfth resistor R12 are connected to the control electrode of the second switch transistor Q2; the cathode of the third diode D3 is connected to the collector of the second switch transistor Q2; the second end of the seventeenth resistor R17 is connected to the VDD pin of the HCS08SG microcontroller 5; the second end of the twelfth resistor R12, the cathode of the first TVS tube D1, the first end of the first capacitor C1, and the anode of the third diode D3 are connected to the positive electrode of the power supply; the second end of the fourth capacitor C4, the anode of the fourth voltage regulator D4, the anode of the first TVS tube D1, and the second end of the first capacitor C1 are grounded. Fully discrete devices are used, which are small in size and low in overall cost compared to LDO.

[0059] HCS08SG MCU 5:

[0060] The RESET pin of the HCS08SG microcontroller 5 is connected to the first end of the fourth resistor R4 and the first end of the fifth capacitor C5. The fourth resistor R4 is a reset resistor. The second end of the fourth resistor R4 is connected to the VDD pin of the HCS08SG microcontroller 5; the second end of the fifth capacitor C5 is grounded. The peripheral circuit of the HCS08SG microcontroller 5 is simplified, which is convenient for typesetting. It adopts an automotive-grade microcontroller, and the product is more stable and reliable.

[0061] In addition, refer to Figures 4 to 5 As shown, a secondary ignition method based on HCS08SG is also provided, which is applied to the secondary ignition circuit based on HCS08SG, and includes the following steps:

[0062] Step S1: The ECU sends out an ignition signal, which is collected and processed by the signal processing module 2 and then transmitted to the HCS08SG microcontroller 5;

[0063] Step S2: the HCS08SG single chip microcomputer 5 outputs a control signal after identification and processing, so as to control the IGBT driving module 3 to drive the IGBT 6 to perform the first ignition;

[0064] Step S3: After the first ignition, the HCS08SG microcontroller 5 samples the emitter of the IGBT 6 through the sampling module 4 to detect the primary current of the IGBT 6; if it is detected that the primary current of the IGBT 6 decreases, step S4 is performed; if it is not detected that the primary current of the IGBT 6 decreases, the primary current of the IGBT 6 continues to be detected;

[0065] Step S4: After a certain delay, the HCS08SG single chip microcomputer 5 outputs a control signal to control the IGBT driving module 3 to drive the IGBT 6 to perform a second ignition.

[0066] Please continue to refer to Figure 4 , ECU sends out an ignition signal, HCS08SG single chip microcomputer 5 detects the ECU signal and then issues an ignition command; HCS08SG single chip microcomputer 5 detects the primary current of the primary ignition and sends out a secondary ignition command when the primary ignition is completed.

[0067] Please continue to refer to Figure 5 , is a schematic diagram of the secondary ignition primary current waveform. The dotted box A is the primary current waveform of the primary ignition, and the dotted box B is the secondary ignition primary current waveform.

[0068] 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 secondary ignition circuit based on HCS08SG, characterized in that: It includes power processing module, signal processing module, IGBT driving module, sampling module, and HCS08SG microcontroller; among which: A power processing module, used to supply power to the entire circuit; The signal processing module is connected between the ECU and the HCS08SG microcontroller, and is used to collect ECU signals and output them to the HCS08SG microcontroller after processing; The IGBT driving module is connected between the HCS08SG single-chip microcomputer and the IGBT, and is used to drive the IGBT to perform the first ignition and the second ignition according to the control signal of the HCS08SG single-chip microcomputer; The sampling module is connected between the HCS08SG microcontroller and the IGBT, and is used to detect the primary current flowing through the IGBT and feed back the detected current information to the HCS08SG microcontroller; The HCS08SG single-chip microcomputer is used to output a control signal to control the IGBT driver module to drive the IGBT for the first ignition; after the first ignition, the HCS08SG single-chip microcomputer samples and detects at the emitter of the IGBT through the sampling module; when it is detected that the primary current of the IGBT drops, the HCS08SG single-chip microcomputer outputs a control signal after a certain delay to control the IGBT driver module to drive the IGBT for the second ignition.

2. The HCS08SG secondary ignition circuit according to claim 1 is characterized in that: The sampling module includes a fifteenth resistor; a first end of the fifteenth resistor is connected to the PTA0 / ACMP+ pin of the HCS08SG single chip microcomputer; and a second end of the fifteenth resistor is connected to the emitter of the IGBT.

3. The HCS08SG secondary ignition circuit according to claim 1, characterized in that: The IGBT drive module includes a drive unit, a long-time protection unit, and a current limiting protection unit; the drive unit is connected to the control electrode of the IGBT and is used to drive the IGBT to work; the long-time protection unit is used to prevent the IGBT from being damaged by transient overheating due to signal abnormality, and the current limiting protection unit is used to limit the current passing through the IGBT.

4. The HCS08SG secondary ignition circuit according to claim 3 is characterized in that: The driving unit includes a dual comparator U3A, a tenth resistor, and an eleventh resistor; the non-phase input end of the dual comparator U3A is connected to the PTB5 pin of the HCS08SG microcontroller; the first end of the tenth resistor and the first end of the eleventh resistor are connected to the output end of the dual comparator U3A; the second end of the tenth resistor and the positive power supply end of the dual comparator U3A are connected to the power processing module; the second end of the eleventh resistor is connected to the control electrode of the IGBT.

5. The HCS08SG secondary ignition circuit according to claim 4 is characterized in that: The long time protection unit includes a ninth resistor, a seventh capacitor, an eighth capacitor, and a second diode; the first end of the ninth resistor, the first end of the seventh capacitor, the first end of the eighth capacitor, and the anode of the second diode are connected to the inverting input end of the dual comparator U3A; the second end of the ninth resistor is connected to the power processing module; the second end of the seventh capacitor is connected to the output end of the dual comparator U3A; the second end of the eighth capacitor is grounded; and the cathode of the second diode is connected to the PTB5 pin of the HCS08SG microcontroller.

6. The HCS08SG secondary ignition circuit according to claim 4 is characterized in that: The current limiting protection unit includes a sixth reference voltage source, a thirteenth resistor, a fourteenth resistor, and a sixteenth resistor; the first end of the thirteenth resistor and the first end of the sixteenth resistor are connected to the reference end of the sixth reference voltage source; the second end of the sixteenth resistor and the first end of the fourteenth resistor are connected to the emitter of the IGBT; the negative electrode of the sixth reference voltage source and the second end of the thirteenth resistor are connected to the output end of the dual comparator U3A; the positive electrode of the sixth reference voltage source and the second end of the fourteenth resistor are grounded.

7. The HCS08SG secondary ignition circuit according to claim 1, characterized in that: The signal processing module includes a dual comparator U3B, a first resistor, a second resistor, a third resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor; the first end of the first resistor and the first end of the fifth resistor are connected to the non-inverting input of the dual comparator U3B; the second end of the first resistor, the first end of the third resistor, and the first end of the sixth resistor are connected to the output of the dual comparator U3B; the second end of the sixth resistor is connected to the PTB4 pin of the HCS08SG microcontroller; the second end of the fifth resistor and the first end of the seventh resistor are connected to the ECU signal input; the first end of the second resistor and the first end of the eighth resistor are connected to the inverting input of the dual comparator U3B; the second end of the second resistor and the second end of the third resistor are connected to the power processing module; the second end of the seventh resistor and the second end of the eighth resistor are grounded.

8. The HCS08SG secondary ignition circuit according to claim 1 is characterized in that: The power processing module includes a seventeenth resistor, a fourth capacitor, a second switch transistor, a fourth voltage regulator, a third diode, a twelfth resistor, a first TVS tube, and a first capacitor; the first end of the fourth capacitor and the first end of the seventeenth resistor are connected to the emitter of the second switch transistor; the cathode of the fourth voltage regulator and the first end of the twelfth resistor are connected to the control electrode of the second switch transistor; the cathode of the third diode is connected to the collector of the second switch transistor; the second end of the seventeenth resistor is connected to the VDD pin of the HCS08SG microcontroller; the second end of the twelfth resistor, the cathode of the first TVS tube, the first end of the first capacitor, and the anode of the third diode are connected to the positive electrode of the power supply; the second end of the fourth capacitor, the anode of the fourth voltage regulator, the anode of the first TVS tube, and the second end of the first capacitor are grounded.

9. The HCS08SG secondary ignition circuit according to claim 1, characterized in that: The RESET pin of the HCS08SG microcontroller is connected to the first end of the fourth resistor and the first end of the fifth capacitor; the second end of the fourth resistor is connected to the VDD pin of the HCS08SG microcontroller; and the second end of the fifth capacitor is grounded.

10. A secondary ignition method based on HCS08SG, applied to the secondary ignition circuit based on HCS08SG according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: ECU sends out an ignition signal, which is collected and processed by the signal processing module and then transmitted to the HCS08SG microcontroller; Step S2: After the HCS08SG single chip microcomputer has identified and processed the signal, it outputs a control signal to control the IGBT drive module to drive the IGBT to ignite for the first time; Step S3: After the first ignition, the HCS08SG microcontroller samples the emitter of the IGBT through the sampling module to detect the primary current of the IGBT; if it is detected that the primary current of the IGBT decreases, step S4 is performed; if it is not detected that the primary current of the IGBT decreases, the primary current of the IGBT continues to be detected; Step S4: After a certain delay, the HCS08SG single chip microcomputer outputs a control signal to control the IGBT drive module to drive the IGBT to ignite for the second time.

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