A multiple ignition protection method and ignition protection circuit based on HCS08SG

Abstract

The application discloses a multiple ignition protection method and an ignition protection circuit based on HCS08SG. The method is used in an ignition module of an automobile engine and comprises the following steps: S1, collecting an ECU driving signal of a signal input end and outputting the signal to an HCS08SG single-chip microcomputer after processing; S2, determining whether multiple ignition needs to be started by using the HCS08SG single-chip microcomputer; if the multiple ignition needs to be started, the HCS08SG single-chip microcomputer controls a power switch of the ignition module to start the multiple ignition; S3, detecting the frequency of the opening and closing of the power switch of the ignition module by using the HCS08SG single-chip microcomputer, and accumulating and calculating the ignition times in a multiple ignition cycle time; and S4, comparing the accumulated and calculated ignition times with a set threshold value by using the HCS08SG single-chip microcomputer, and controlling the power switch of the ignition module to close the multiple ignition after the set threshold value is reached. The application can accurately control the multiple ignition times of the ignition module, reduce the heat quantity of the multiple ignition module, prolong the service life of the multiple ignition module, and reduce the failure rate of the ignition coil.

Description

Technical Field

[0001] This invention relates to the field of automotive engine ignition module technology, and in particular to a multiple ignition protection method and ignition protection circuit based on HCS08SG. Background Technology

[0002] In the ignition module of a car engine, the power switch is controlled by the car's ECU (Electronic Control Unit) to turn on and off. That is, the ECU drives the power switch of the ignition module to turn on and off through the EST square wave signal, thereby controlling the ignition coil to ignite.

[0003] Existing multiple ignition modules do not control the number of ignitions per ignition coil. After the ECU sends a drive signal, the multiple ignition module controls multiple ignitions based on the multiple ignition cycle time of the ECU drive signal; however, it does not control the number of ignitions. In practical applications, abnormal ECU drive signals may cause the number of ignitions to become uncontrollable. Excessive ignitions can lead to increased heat generation in the ignition module, and in severe cases, the power switch may overheat during short-term operation, causing the ignition module to burn out. Summary of the Invention

[0004] The purpose of this invention is to provide a multiple ignition protection method and ignition protection circuit based on HCS08SG, which can accurately control the number of multiple ignitions of the ignition module, reduce the heat generation of the multiple ignition module, extend the service life of the multiple ignition module, and reduce the failure rate of the ignition coil.

[0005] To achieve the above objectives, the following technical solution is adopted:

[0006] A method for multiple ignition protection based on HCS08SG, the method operating in the ignition module of an automotive engine, the method comprising the following steps:

[0007] S1: Collects the ECU drive signal at the signal input terminal, processes it, and outputs it to the HCS08SG microcontroller;

[0008] S2: Use the HCS08SG microcontroller to determine whether multiple ignition needs to be activated; if it needs to be activated, the HCS08SG microcontroller controls the power switch of the ignition module to activate multiple ignitions; if it does not need to be activated, wait for the next ECU drive signal to be acquired before continuing to make a judgment.

[0009] S3: Use the HCS08SG microcontroller to detect the frequency of the ignition module power switch being turned on and off, and accumulate and calculate the number of ignitions within multiple ignition cycles.

[0010] S4: The HCS08SG microcontroller compares the accumulated number of ignitions with a set threshold. Once the set threshold is reached, it controls the power switch of the ignition module to shut down multiple ignitions.

[0011] Preferably, in step S3, the secondary voltage and primary current of the ignition coil are first collected, and then the HCS08SG microcontroller is used to perform AD conversion processing on the collected secondary voltage and primary current to determine the frequency of the ignition module power switch being turned on and off.

[0012] A multiple ignition protection circuit based on HCS08SG includes a method for protecting against multiple ignitions based on HCS08SG. The circuit includes an HCS08SG microcontroller and an input signal acquisition module, a secondary voltage sampling module, a primary current sampling module, and an LDO module, all connected to the HCS08SG microcontroller. The input signal acquisition module acquires ECU drive signals, processes them, and outputs them to the HCS08SG microcontroller to determine whether to initiate multiple ignitions. The secondary voltage sampling module acquires the secondary voltage of the ignition coil, and the primary current sampling module acquires the primary current of the ignition coil. The HCS08SG microcontroller performs AD conversion on the acquired secondary voltage and primary current, accumulates and calculates the number of ignitions, and controls the shutdown of multiple ignitions after the number of ignitions reaches a preset threshold. The LDO module is connected to the vehicle power supply to improve the power supply's surge protection capability.

[0013] Preferably, the power switch of the ignition module is an IGBT transistor; the primary current sampling module is used to sample the current at the emitter of the IGBT transistor.

[0014] Preferably, the primary current sampling module includes sampling resistor R18 and sampling resistor R19; one end of each sampling resistor R18 and sampling resistor R19 is connected to the emitter of the IGBT transistor, the other end of sampling resistor R18 is connected to the HCS08SG microcontroller, and the other end of sampling resistor R19 is grounded.

[0015] Preferably, the secondary voltage sampling module includes voltage divider resistors R14 and R15; one end of the voltage divider resistor R14 is connected to the HCS08SG microcontroller, and the other end is grounded after passing through the voltage divider resistor R15; the common connection terminal of the voltage divider resistors R14 and R15 is connected to the secondary positive high voltage of the ignition coil.

[0016] Preferably, the input signal acquisition module includes a comparator U1, and a filter unit and a surge protection unit connected to the positive input terminal of the comparator U1; the input signal acquisition module is connected to the signal input terminal IN+ and the signal input terminal IN- respectively; the output terminal of the comparator U1 is connected to the I / O pin of the HCS08SG microcontroller.

[0017] Preferably, the LDO module includes a vehicle-grade LDO chip U3.

[0018] By adopting the above solution, the beneficial effects of the present invention are:

[0019] This invention uses an HCS08SG microcontroller to collect the secondary voltage and primary current of the ignition coil, performs AD conversion processing, and accumulates the number of ignitions. After reaching a preset threshold, it controls the shutdown of multiple ignitions, thereby precisely controlling the number of multiple ignitions of the ignition module, reducing the heat generation of the multiple ignition module, extending the service life of the multiple ignition module, reducing the failure rate of the ignition coil, ensuring effective and stable ignition of the ignition coil, protecting the normal operation of the multiple ignition module, and thus ensuring the stability of vehicle power and reducing exhaust emissions. Attached Figure Description

[0020] Figure 1 This is a flowchart of a multiple ignition protection method based on HCS08SG according to the present invention.

[0021] Figure 2 This is a circuit diagram of a multiple ignition protection circuit based on HCS08SG according to the present invention.

[0022] Figure 3 (a) is a waveform diagram of the uncontrolled number of ignitions when the ECU drive signal is normal according to the present invention;

[0023] Figure 3 (b) is a waveform diagram showing that the number of ignition cycles has been controlled when the ECU drive signal is normal according to the present invention;

[0024] Figure 4 (a) is a waveform diagram of the uncontrolled number of ignitions when the ECU drive signal is abnormal according to the present invention;

[0025] Figure 4 (b) is a waveform diagram showing the controlled number of ignition attempts when the ECU drive signal is abnormal according to the present invention;

[0026] The following are explanations of the labels in the attached diagram:

[0027] 1—HCS08SG microcontroller, 2—Input signal acquisition module

[0028] 3—Secondary voltage sampling module, 4—Primary current sampling module

[0029] 5—LDO module, A—ECU drive signal waveform,

[0030] B—Primary current waveform. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0034] Reference Figures 1 to 4 As shown, this invention provides a multiple ignition protection method based on HCS08SG. The method operates in the ignition module of an automotive engine and includes the following steps:

[0035] S1: Collect the ECU drive signal at the signal input terminal, process it, and output it to the HCS08SG microcontroller 1;

[0036] S2: Use HCS08SG microcontroller 1 to determine whether multiple ignition needs to be activated; if it needs to be activated, HCS08SG microcontroller 1 controls the power switch of the ignition module to activate multiple ignition; if it does not need to be activated, wait for the next ECU drive signal to be acquired before continuing to determine.

[0037] S3: First, the secondary voltage and primary current of the ignition coil are collected. Then, the HCS08SG microcontroller is used to perform AD conversion on the collected secondary voltage and primary current to determine the frequency of the ignition module power switch opening and closing, and to accumulate and calculate the number of ignitions within multiple ignition cycles.

[0038] S4: The HCS08SG microcontroller 1 compares the accumulated number of ignitions with the set threshold. Once the set threshold is reached, it controls the power switch of the ignition module to shut down multiple ignitions.

[0039] When the ECU sends a drive signal, including single ignition and multiple ignition signals, the HCS08SG microcontroller detects and processes the ECU drive signal (rising edge and falling edge) to determine whether to enable multiple ignition. After the determination, it outputs the processed control signal to the power switch to control its on and off states.

[0040] A multiple ignition protection circuit based on HCS08SG includes a method for protecting against multiple ignitions based on HCS08SG. The circuit comprises an HCS08SG microcontroller 1, and an input signal acquisition module 2, a secondary voltage sampling module 3, a primary current sampling module 4, and an LDO module 5, all connected to the HCS08SG microcontroller 1. The input signal acquisition module 2 acquires ECU drive signals, processes them, and outputs them to the HCS08SG microcontroller 1 to determine whether to initiate multiple ignitions. The secondary voltage sampling module 3 acquires the secondary voltage of the ignition coil, and the primary current sampling module 4 acquires the primary current of the ignition coil. The HCS08SG microcontroller 1 performs AD conversion on the acquired secondary voltage and primary current, accumulates and calculates the number of ignitions, and controls the shutdown of multiple ignitions after the number of ignitions reaches a preset threshold. The LDO module 5 is connected to the vehicle power supply to improve the power supply's surge protection capability. The power switch of the ignition module is preferably an IGBT transistor. This invention uses a dedicated microcontroller to collect and process signals through both hardware and software, which greatly improves the ignition accuracy of the multi-ignition module.

[0041] Input signal acquisition module 2:

[0042] The input signal acquisition module 2 includes a comparator U1, and a filter unit and a surge protection unit connected to the positive input terminal of the comparator U1; the input signal acquisition module 2 is connected to the signal input terminal IN+ and the signal input terminal IN- respectively; the output terminal of the comparator U1 is connected to the I / O pin of the HCS08SG microcontroller 1.

[0043] IN+ and IN- are signal input terminals. The signal input is dual-input, with the IN- terminal separated from the vehicle power supply negative terminal GND to improve signal interference immunity. Please continue to refer to... Figure 2 The filtering unit includes capacitors C2 and C3, and the surge protection unit includes resistor R4. The ECU drive signal is input from the signal input terminal IN+, filtered, and then input to the positive input terminal of comparator U1. After comparison with the reference voltage, it is output to the I / O pin of HCS08SG microcontroller 1.

[0044] Secondary voltage sampling module 3:

[0045] The secondary voltage sampling module 3 includes voltage divider resistors R14 and R15; one end of the voltage divider resistor R14 is connected to the HCS08SG microcontroller 1, and the other end is grounded after passing through the voltage divider resistor R15; the common connection terminal of the voltage divider resistors R14 and R15 is connected to the secondary positive high voltage of the ignition coil.

[0046] HV+ is the secondary positive high voltage of the ignition coil. After being divided by high-precision resistors R14 and R15, it is input to the HCS08SG microcontroller.

[0047] Primary current sampling module 4:

[0048] The primary current sampling module 4 is used to sample the current at the emitter of the IGBT. The primary current sampling module 4 includes sampling resistors R18 and R19; one end of each sampling resistor R18 and R19 is connected to the emitter of the IGBT, the other end of sampling resistor R18 is connected to the HCS08SG microcontroller 1, and the other end of sampling resistor R19 is grounded. The HCS08SG microcontroller 1 samples the current at the emitter of the IGBT through sampling resistors R18 and R19.

[0049] LDO Module 5:

[0050] B+ is the positive terminal of the vehicle power supply, which uses a dedicated automotive-grade LDO chip U3 to improve the power supply's surge protection capability.

[0051] Since microcontrollers cannot directly process analog signals, an analog-to-digital (AD) converter is required to convert the analog signal into a digital signal before cumulative calculation can be performed. The HCS08SG microcontroller internally processes the acquired secondary voltage and primary current via AD conversion, cumulatively calculating the number of ignitions. Once a set threshold is reached, multiple ignitions are shut off. The secondary voltage of the ignition coil is the ignition start signal, and the primary current is the ignition end signal. Each acquisition of a secondary voltage signal and a primary current signal constitutes one ignition. By acquiring the secondary voltage and primary current of the ignition coil multiple times, the number of ignitions within a multiple ignition cycle can be accumulated, allowing determination of whether the number of ignitions exceeds the preset threshold.

[0052] In one specific embodiment, the threshold is set to 6 times. The HCS08SG microcontroller 1 determines the start of an ignition cycle by sampling the secondary voltage of the ignition coil, and determines the end of an ignition cycle by sampling the primary current of the ignition coil. When a total of 6 ignition cycles have been accumulated, even if the drive signal issued by the ECU is still at a high level, the HCS08SG microcontroller 1 no longer outputs a control signal to turn on the power switch, thereby achieving the function of controlling the number of ignition cycles by the HCS08SG microcontroller 1 to turn on and off the power switch.

[0053] In addition, the timing of each ignition needs to be controlled. Assuming that the ECU drive signal gives a multiple ignition time of 3ms (multiple ignition cycle time), the ignition module needs to perform 6 ignitions within 3ms.

[0054] Please continue to refer to Figure 3-4 When the number of ignitions is not controlled after the ECU drive signal is output, the ignition will stop only when the ECU drive signal ends; when the number of ignitions is controlled after the ECU drive signal is output, the ignition will stop after the number of ignitions reaches a set threshold.

[0055] in Figure 3 (a) is a schematic diagram of the waveforms of the ECU drive signal and the primary current of the ignition coil when the ECU drive signal is normal and the number of ignitions is not controlled. Figure 3 (b) is a waveform diagram of the ECU drive signal and the primary current of the ignition coil when the ECU drive signal is normal and the number of ignition cycles has been controlled. Figure 4 (a) is a schematic diagram of the waveforms of the ECU drive signal and the primary current of the ignition coil when the ECU drive signal is abnormal and the number of ignitions is not controlled. Figure 4 Figure (b) shows the waveforms of the ECU drive signal and the primary current of the ignition coil when the ECU drive signal is abnormal and the number of ignitions has been controlled. This demonstrates that when the number of ignitions is controlled, the number of ignitions within a single ignition cycle can be precisely controlled regardless of whether the ECU drive signal is normal or not.

[0056] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. Obviously, the above embodiments of the present invention are merely examples to clearly illustrate the present invention and are not intended to limit the implementation of the present invention. For those skilled in the art, various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for multiple ignition protection based on HCS08SG, characterized in that, The method operates in the ignition module of an automotive engine, and includes the following steps: S1: Collects the ECU drive signal at the signal input terminal, processes it, and outputs it to the HCS08SG microcontroller; S2: The HCS08SG microcontroller detects and processes the rising and falling edges of the ECU drive signal to determine whether multiple ignition needs to be activated. If it needs to be activated, the HCS08SG microcontroller controls the power switch of the ignition module to activate multiple ignitions. If it does not need to be activated, it waits for the next ECU drive signal to be acquired before continuing to make a judgment. S3: During multiple ignition cycles, the secondary voltage and primary current of the ignition coil are first collected. Then, the HCS08SG microcontroller is used to perform AD conversion on the collected secondary voltage and primary current. The secondary voltage of the ignition coil is used as the ignition start signal, and the primary current of the ignition coil is used as the ignition end signal. When a secondary voltage signal and a primary current signal are collected, it is calculated as one ignition. The frequency of the ignition module power switch being turned on and off is detected, and the number of ignitions during multiple ignition cycles is accumulated and calculated. S4: The HCS08SG microcontroller compares the accumulated number of ignitions with a set threshold. When the number of ignitions reaches the set threshold, it controls the power switch of the ignition module to shut off multiple ignitions. The set threshold is 6 times. When there are a total of 6 ignition cycles, even if the drive signal sent by the ECU is still high, the HCS08SG microcontroller will no longer output a control signal to turn on the power switch.

2. A multiple ignition protection circuit based on HCS08SG, comprising the multiple ignition protection method based on HCS08SG as described in claim 1, characterized in that, The system includes an HCS08SG microcontroller, and an input signal acquisition module, a secondary voltage sampling module, a primary current sampling module, and an LDO module, all connected to the HCS08SG microcontroller. The input signal acquisition module acquires ECU drive signals, processes them, and outputs them to the HCS08SG microcontroller to determine whether to initiate multiple ignition cycles. The secondary voltage sampling module acquires the secondary voltage of the ignition coil, and the primary current sampling module acquires the primary current of the ignition coil. The HCS08SG microcontroller performs AD conversion on the acquired secondary voltage and primary current, accumulates and calculates the number of ignition cycles, and controls the shutdown of multiple ignition cycles after the number of ignition cycles reaches a preset threshold. The LDO module is connected to the vehicle power supply to improve the power supply's surge protection capability.

3. The multiple ignition protection circuit based on HCS08SG according to claim 2, characterized in that, The power switch of the ignition module is an IGBT transistor; the primary current sampling module is used to sample the current at the emitter of the IGBT transistor.

4. The multiple ignition protection circuit based on HCS08SG according to claim 3, characterized in that, The primary current sampling module includes sampling resistors R18 and R19; one end of each sampling resistor R18 and R19 is connected to the emitter of the IGBT transistor, the other end of sampling resistor R18 is connected to the HCS08SG microcontroller, and the other end of sampling resistor R19 is grounded.

5. The multiple ignition protection circuit based on HCS08SG according to claim 2, characterized in that, The secondary voltage sampling module includes voltage divider resistors R14 and R15; one end of voltage divider resistor R14 is connected to the HCS08SG microcontroller, and the other end is grounded after passing through voltage divider resistor R15; the common connection terminal of voltage divider resistors R14 and R15 is connected to the secondary positive high voltage of the ignition coil.

6. The multiple ignition protection circuit based on HCS08SG according to claim 2, characterized in that, The input signal acquisition module includes a comparator U1, and a filter unit and a surge protection unit connected to the positive input terminal of the comparator U1; the input signal acquisition module is connected to the signal input terminal IN+ and the signal input terminal IN- respectively; the output terminal of the comparator U1 is connected to the I / O pin of the HCS08SG microcontroller.

7. The multiple ignition protection circuit based on HCS08SG according to claim 2, characterized in that, The LDO module includes a vehicle-grade LDO chip, U3.

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