Ignition circuit based on coil power supply voltage stabilization and internal combustion engine ignition system

Abstract

The embodiment of the invention relates to the technical field of vehicle-mounted electronics, and discloses an ignition circuit based on coil power supply voltage stabilization and an internal combustion engine ignition system, which comprise a power supply, a control signal preprocessing unit, a single chip microcomputer, an input power supply sampling unit, a voltage stabilization unit and a coil processing control unit, the single chip microcomputer obtains the control signal preprocessed by the control signal preprocessing unit and analyzes whether the preprocessed control signal is an ignition signal or not, if the preprocessed control signal is the ignition signal, the single chip microcomputer obtains sampling voltage input into the power source sampling unit and analyzes whether the sampling voltage is within a preset voltage range or not, and if the sampling voltage is within the preset voltage range, the single chip microcomputer outputs the control signal; if yes, outputting a voltage stabilization control instruction to the voltage stabilization unit; the voltage stabilization unit stabilizes the voltage of the power supply to a preset voltage value according to the voltage stabilization control instruction and provides the voltage to the coil processing control unit. By means of the mode, the stable voltage can be output in the complex vehicle-mounted voltage environment, effective and stable ignition is ensured, and the reliability of an ignition system is enhanced.

Description

Technical Field

[0001] This invention relates to the field of automotive electronics technology, specifically to an ignition circuit and an internal combustion engine ignition system based on coil power supply voltage regulation. Background Technology

[0002] In existing automotive ignition systems, the stability of the ignition coil's power supply is crucial, directly affecting engine ignition control. Current ignition solutions typically use the vehicle's power network for direct power. In the automotive operating environment, the vehicle's power network (such as the battery system) experiences significant voltage fluctuations due to the starting and stopping of high-power electrical equipment; for example, a momentary drop below 6V or a surge above 18V. These voltage fluctuations can lead to abnormal energy output from the ignition control module, causing ignition coil malfunctions, ignition failure, or incomplete fuel combustion, ultimately affecting the vehicle's power stability. Summary of the Invention

[0003] In view of the above problems, embodiments of the present invention provide an ignition circuit and an internal combustion engine ignition system based on coil power supply voltage regulation to solve the problems existing in the prior art.

[0004] According to one aspect of the present invention, an ignition circuit based on coil power supply voltage regulation is provided. The ignition circuit based on coil power supply voltage regulation includes a power supply, a control signal preprocessing unit, a microcontroller, an input power sampling unit, a voltage regulation unit, and a coil processing control unit. The control signal preprocessing unit is electrically connected to an external electronic controller and the microcontroller. The input power sampling unit is connected in parallel between the power supply and the microcontroller. The voltage regulation unit is electrically connected to the power supply and the microcontroller. The voltage regulation unit is also electrically connected to the coil processing control unit. The control signal preprocessing unit is used to acquire and preprocess the control signals of the electronic controller; The input power sampling unit is used to sample the voltage of the power supply to obtain a sampling voltage. The microcontroller is used to acquire the control signal preprocessed by the control signal preprocessing unit, analyze whether the preprocessed control signal is an ignition signal, and if it is an ignition signal, acquire the sampling voltage of the input power sampling unit, analyze whether the sampling voltage is within a preset voltage range, and if the sampling voltage is within the preset voltage range, output a voltage regulation control command to the voltage regulation unit. The voltage regulator unit is used to stabilize the voltage of the power supply to a preset voltage value according to the voltage regulation control command, and provide it to the coil processing control unit for ignition.

[0005] In one optional embodiment, the voltage regulation unit includes a power management chip with integrated buck-boost control function and a voltage regulation circuit. The input terminal of the power management chip is electrically connected to the microcontroller, and the output terminal is electrically connected to the voltage regulation circuit. The power management chip is used to output buck-boost control signals to the voltage regulation circuit according to the voltage regulation control command. The input terminal of the voltage regulation circuit is also electrically connected to the power supply, and the output terminal of the voltage regulation circuit is electrically connected to the coil processing control unit. The voltage regulation unit is used to stabilize the voltage of the power supply to the preset voltage value according to the buck-boost control signal.

[0006] In one optional embodiment, the voltage regulator unit further includes an input voltage sampling circuit, an output voltage sampling circuit, and an output voltage feedback circuit. The power management chip is an MPQ4208 chip. The input voltage sampling circuit is connected in series to the input terminal of the voltage regulator circuit and is also electrically connected to the MPQ4208 chip. The output voltage sampling circuit is connected in series to the output terminal of the voltage regulator circuit and is also electrically connected to the MPQ4208 chip. The output voltage feedback circuit is also electrically connected between the output terminal of the voltage regulator circuit and the MPQ4208 chip. The input voltage sampling circuit is used to sample the input voltage of the power supply and feed it back to the MPQ4208 chip; The output voltage sampling circuit is used to sample the output voltage of the voltage regulator circuit and feed it back to the MPQ4208 chip; The output voltage feedback circuit is used to divide the output voltage and feed it back to the MPQ4208 chip; The MPQ4208 chip is used to output the buck-boost control signal to the voltage regulator circuit according to the voltage regulation control command, the sampled input voltage, the sampled output voltage, and the voltage divider of the output voltage; The voltage regulator circuit stabilizes the voltage of the power supply to a preset voltage value according to the buck-boost control signal and provides it to the coil processing control unit.

[0007] In one optional embodiment, the voltage regulator circuit is an H-bridge power circuit, which includes a buck half-bridge and a boost half-bridge connected by an inductor. The input terminal of the buck half-bridge is electrically connected to the buck signal control terminal of the MPQ4208 chip, and the input terminal of the boost half-bridge is electrically connected to the boost signal control terminal of the MPQ4208 chip. When the buck-boost control signal is a buck control signal, the buck half-bridge operates to step down the voltage of the power supply to a preset voltage value. When the buck-boost control signal is a boost control signal, the boost half-bridge operates to boost the voltage of the power supply to a preset voltage value.

[0008] In one alternative embodiment, the voltage regulating unit further includes a first filtering and voltage regulating circuit, which is connected in parallel to the output terminal of the voltage regulating circuit and is used to filter and regulate the output voltage of the voltage regulating circuit.

[0009] In one alternative embodiment, the voltage regulator unit further includes a second filtering and voltage regulator circuit, which is connected in parallel to the input terminal of the voltage regulator circuit and is used to filter and regulate the input voltage of the voltage regulator circuit.

[0010] In one alternative approach, the microcontroller is model MC9S08SG8-PIN16.

[0011] In one alternative embodiment, a series voltage regulator unit is connected in series between the power supply and the microcontroller to stabilize the voltage of the power supply and provide it to the microcontroller.

[0012] In one alternative approach, the preset voltage range is 6V to 18V, and the preset voltage value is 12V.

[0013] According to another aspect of the present invention, an internal combustion engine ignition system is provided, the internal combustion engine ignition system including the above-described ignition circuit based on coil power supply voltage regulation.

[0014] This invention relates to a voltage regulation and control circuit based on a control signal preprocessing unit, a microcontroller, an input power sampling unit, and a voltage regulator unit. The microcontroller intelligently controls the voltage regulator unit by comprehensively judging the control signal from the control signal preprocessing unit and the sampled voltage from the input power sampling unit through a control program. The voltage regulator unit adjusts the voltage to output a stable voltage for ignition by the coil processing control unit. This allows for stable voltage output even under complex vehicle voltage conditions (such as cold starts and sudden load changes), ensuring effective and stable ignition and enhancing the reliability of the ignition system.

[0015] The above description is merely an overview of the technical solutions of the embodiments of the present invention. In order to better understand the technical means of the embodiments of the present invention and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0016] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of an ignition circuit based on coil power supply regulation provided in an embodiment of the present invention is shown; Figure 2 As shown Figure 1 The diagram shows a partial circuit diagram of an ignition circuit based on coil power supply regulation. Figure 3 As shown Figure 1 The diagram shows the structure of the voltage regulator unit. Figure 4 As shown Figure 3 The circuit diagram of the voltage regulator unit is shown. Detailed Implementation

[0017] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein.

[0018] Figure 1 A schematic diagram of the ignition circuit based on coil power supply regulation provided in an embodiment of the present invention is shown, as follows: Figure 1 As shown, the ignition circuit based on coil power supply voltage regulation in this embodiment of the invention includes a power supply, a control signal preprocessing unit, a microcontroller, an input power sampling unit, a voltage regulation unit, and a coil processing control unit. The control signal preprocessing unit is electrically connected to an external electronic controller and a microcontroller, the input power sampling unit is connected in parallel between the power supply and the microcontroller, the voltage regulation unit is electrically connected to the power supply and the microcontroller, and the voltage regulation unit is also electrically connected to the coil processing control unit. The control signal preprocessing unit is used to acquire the control signals of the electronic controller and perform signal preprocessing on the control signals; The input power sampling unit is used to sample the voltage of the power supply to obtain the sampled voltage. The microcontroller is used to acquire the control signal after preprocessing by the control signal preprocessing unit, analyze whether the preprocessed control signal is an ignition signal, and if it is an ignition signal, acquire the sampling voltage of the input power sampling unit, analyze whether the sampling voltage is within the preset voltage range, and if the sampling voltage is within the preset voltage range, output a voltage regulation control command to the voltage regulation unit. The voltage regulator unit is used to stabilize the power supply voltage to a preset voltage value according to the voltage regulation control command and provide it to the coil processing control unit for ignition.

[0019] Preferably, the microcontroller model is MC9S08SG8-PIN16.

[0020] See also Figure 2 For the control signal preprocessing unit, the ignition control signal from the electronic controller is input to the IN+ and IN- pins of the control signal preprocessing unit. The control signal preprocessing unit performs filtering, shaping, and conversion preprocessing on the ignition control signal before inputting it to the microcontroller. Figure 2In the control signal preprocessing unit, C16, C24, R3, R1, R2, Q2, R8, and C7 perform preprocessing of the ignition control signal. Among them, capacitors C16 and C24 and resistors R1, R2, and R3 form a filter network to filter out high-frequency interference and glitches in the ignition control signal and improve the anti-electromagnetic interference capability. Transistor Q2 and its surrounding resistor R7 form a switching circuit or inverter, which converts the ignition control signal of the electronic controller into a standard digital level signal that the microcontroller can directly and clearly recognize, so as to ensure that the microcontroller can accurately determine when or whether ignition is needed. The digital level signal is input to pin 9 PTB3 of the microcontroller for detection and judgment.

[0021] For the input power sampling unit, resistors R32 and R39 form a precision voltage divider, proportionally reducing the fluctuating automotive power network voltage (B+) to a safe measurement range (e.g., 0-5V) for the microcontroller input pin. C26 is a filter capacitor used to smooth the sampling voltage, obtaining a stable sampling voltage: the ADC sampled value. The divided analog voltage signal B+_AD is sent to pin 16 of the microcontroller, PTA0 / ACMP+, which is configured as the ADC input. By reading the voltage value of B+_AD in real time, the microcontroller can accurately sense the current voltage state of the automotive power network, whether it is the normal 12V, 9V during a cold start, or 14V during a sudden load change, etc. This voltage state is crucial for subsequent intelligent voltage regulation control and determining whether ignition conditions are permissible.

[0022] Furthermore, a series voltage regulator unit is connected in series between the power supply and the microcontroller to stabilize the power supply voltage and provide it to the microcontroller, such as... Figure 2 As shown, the series voltage regulator unit includes Q1, D6, R23, R28, C11, and D3. Transistor Q1 stabilizes the power supply voltage and provides it to the microcontroller by changing its own voltage drop. Freewheeling diode D6 prevents the downstream inductive load from generating reverse high voltage that could break down Q1 when it is turned off. R23 and C11 form a compensation network to optimize loop stability and prevent high-frequency oscillation. R28 is a pull-up current-limiting resistor. Diode D3 can prevent reverse connection and protect the diode, thereby achieving voltage stability for the output to the microcontroller.

[0023] For microcontrollers, the ignition control signal is analyzed in the form of a digital level signal. For example, a digital level of 1 indicates an ignition signal, and a digital level of 0 indicates a non-ignition signal. If it is not an ignition signal, no sampling voltage acquisition or subsequent analysis will be performed. If it is an ignition signal, the voltage value of B+_AD in the input power sampling unit is acquired, and it is analyzed whether the voltage value of B+_AD is within the preset voltage range, which is 6V to 18V. If the sampled voltage is within the range of 6V to 18V, a voltage regulation control command is output to the voltage regulation unit. The voltage regulation control command is sent to the voltage regulation unit through the microcontroller's communication interface pins 8 (PTB4), 7 (PTB5), 14 (PTA2 / ACMP0), and 15 (PTA1 / ACMP-), via SDA serial data, SCL clock signal, INT interrupt, and EN enable signal. The configuration commands and data are sent through SDA and SCL, including parameters such as the regulated output voltage, switching frequency, and current protection threshold, all of which can be dynamically configured by the microcontroller. In this embodiment, the microcontroller can intelligently adjust the output voltage of the voltage regulator unit based on the voltage value of B+_AD. For example, when the power input voltage is low, the switching frequency is slightly increased to maintain voltage stability; when the input voltage is normal, no processing is required; and when the power input voltage is high, the switching frequency is slightly decreased to maintain voltage stability.

[0024] In one embodiment, the voltage regulator unit achieves voltage stabilization through a power management chip and a voltage regulator circuit that integrates buck-boost control functions. For example, the power management chip could be an SC814xxQ series chip or an SC6259XQ chip, or any other automotive-grade chip capable of voltage regulation; no limitation is made here. The input terminal of the power management chip is electrically connected to a microcontroller, and the output terminal is electrically connected to the voltage regulator circuit. The power management chip outputs buck-boost control signals to the voltage regulator circuit according to the voltage regulation control instructions. The input terminal of the voltage regulator circuit is also electrically connected to the power supply, and the output terminal is electrically connected to the coil processing control unit. This stabilizes the power supply voltage to a preset voltage value according to the buck-boost control signals. Thus, the voltage regulator circuit can stabilize a wide input voltage range to a preset voltage value and output a stable voltage to the coil processing control unit, ensuring that the ignition energy does not fluctuate with the vehicle's power supply.

[0025] Further, see Figure 3 The voltage regulator unit also includes an input voltage sampling circuit, an output voltage sampling circuit, and an output voltage feedback circuit. The power management chip is an MPQ4208 chip. The input voltage sampling circuit is connected in series to the input terminal of the voltage regulator circuit and is also electrically connected to the MPQ4208 chip. The output voltage sampling circuit is connected in series to the output terminal of the voltage regulator circuit and is also electrically connected to the MPQ4208 chip. The output terminal of the voltage regulator circuit and the MPQ4208 chip are also electrically connected to the output voltage feedback circuit.

[0026] The input voltage sampling circuit is used to sample the input voltage of the power supply and feed it back to the MPQ4208 chip; The output voltage sampling circuit is used to sample the output voltage of the voltage regulator circuit and feed it back to the MPQ4208 chip. The output voltage feedback circuit is used to divide the output voltage and feed it back to the MPQ4208 chip; The MPQ4208 chip is used to output buck-boost control signals to the voltage regulator circuit based on the voltage regulation control command, the sampled input voltage, the sampled output voltage, and the voltage divider of the output voltage. The voltage regulator circuit stabilizes the power supply voltage to a preset value based on the buck-boost control signal and then supplies it to the coil processing control unit. The preset voltage value is 12V.

[0027] See also Figure 4 B+ represents the voltage input to the voltage regulator unit, and C+ represents the 12V stable voltage output from the voltage regulator unit, which is provided to the coil processing control unit. The communication interfaces of the MPQ4208 chip, pins 32 (EN), 19 (ALT), 20 (SCL), and 21 (SDA), are connected to pins 15, 14, 7, and 8 of the microcontroller, respectively, to obtain voltage regulation control commands.

[0028] The input voltage sampling circuit includes sampling resistor R22, which samples the power supply voltage and inputs it to pins 29 (IS1N), 30 (IS1P), and 31 (VIN) of the MPQ4208 chip. The output voltage sampling circuit includes sampling resistor R53, which samples the output voltage and inputs it to pins 12 (IS1P), 13 (IS1N), and 11 (OUT) of the MPQ4208 chip. The output voltage feedback circuit includes voltage divider resistors R41 and R37, which divide the output voltage and feed it back to pin 7 (FB) of the MPQ4208 chip. Pins 31 (VIN) and 11 (OUT) are directly connected to the input and output, respectively, to monitor the input and output voltage values ​​of the voltage regulator circuit, assisting in mode determination and protection. R41 is significantly larger than R37; for example, R41 is 40 kΩ, while R37 is 1.8 kΩ.

[0029] The input voltage sampling circuit monitors the input power of the voltage regulator circuit and implements overcurrent protection, providing input-side overcurrent protection and improving the system's protection mechanism. The sampling resistor R22 has a very small resistance, typically in the milliohm range; for example, R53 = 0.002R. Its working principle is as follows: it samples the input voltage and sends the voltage signal to the MPQ4208 chip. The MPQ4208 chip analyzes the sampled input voltage to determine if the input power and current are normal, preventing the power supply from providing current beyond its capacity. If the input current abnormally increases, the chip will take protective measures.

[0030] The output voltage sampling circuit monitors output power, overload, and short-circuit protection, providing overcurrent protection and power management on the output side. The sampling resistor R53 has a very small resistance, typically in the milliohm range (e.g., R53 = 0.002R). R53 converts the output current into a proportional small voltage signal. This small voltage is fed to the MPQ4208 chip, which internally contains a current-sensing amplifier and a comparator. By analyzing the sampled output voltage, it determines whether the output current is within a safe range. When the output current is too high, such as in the event of a short circuit, the voltage across the sampling resistor R53 will exceed the set current threshold. The MPQ4208 chip immediately shuts down the PWM output to prevent damage to the power transistor and circuitry due to overheating.

[0031] In this embodiment, the input voltage sampling circuit protects the input terminal, and the output voltage sampling circuit protects the output terminal. Both provide key data for complex buck-boost control algorithms. The MPQ4208 chip needs to know the energy states of both the input and output to smoothly switch between buck and boost modes, avoiding voltage jitter or current surges, and achieving smooth switching between buck and boost modes.

[0032] The output voltage feedback circuit divides the output voltage (12V) proportionally to a lower, chip-recognizable level (e.g., 0.6V or 0.8V) using a voltage divider resistor, feeding this voltage back to the FB (voltage divider feedback) of the MPQ4208 chip. This is crucial for voltage regulation accuracy. The MPQ4208 chip's internal error amplifier compares the FB feedback voltage with the reference voltage and dynamically adjusts the PWM duty cycle to stabilize the FB feedback voltage, thus ensuring accurate and stable output voltage. Voltage divider feedback is the core of closed-loop control; the MPQ4208 chip can determine whether the current output voltage is accurate and correct accordingly.

[0033] The aforementioned input voltage sampling circuit, output voltage sampling circuit, and output voltage feedback circuit work together to upgrade the MPQ4208 chip from a simple switching controller into an intelligent, safe, and efficient power management system.

[0034] Furthermore, the voltage regulator circuit is an H-bridge power circuit, such as... Figure 4As shown, the MOSFET switches Q6A, Q6B, Q5A, Q5B, inductor F1, and resistors R30, R34, R26, R33, R2, R12, R29, and R31 form a voltage regulator circuit. MOSFET switches Q6A and Q6B act as a buck half-bridge, controlled by the SIN signals from pins 26 (HG1), 27 (SW1), 28 (BST1), and 25 (LG1) of the MPQ4208 chip. In buck mode, with an input voltage >12V, Q6B acts as a control switch, Q5A is normally open, Q6A acts as a synchronous rectifier switch, and Q5B is normally closed. Q6A and Q6B alternately conduct / cut off. Inductor F1 is responsible for energy storage and release, current filtering, and, together with the output capacitor, reduces the input voltage to approximately 12V.

[0035] MOSFET switches Q5A and Q5B form another boost half-bridge, controlled by the SOUT signals from pins 16 (HG2), 15 (SW2), 14 (BST2), and 17 (LG2) of the MPQ4208 chip. In boost mode, the input voltage is <12V. Q5B acts as a control switch, Q6A is normally off, and Q6B is normally on. Q5A acts as a synchronous rectifier switch. Q5A and Q6B alternately turn on and off. Inductor F1 is responsible for energy storage and release, current filtering, and works with the output capacitor to boost the input voltage to close to 12V.

[0036] In an optional embodiment, the voltage regulator unit further includes a first filter and voltage regulator circuit, which is connected in parallel to the output terminal of the voltage regulator circuit and electrically connected to the first filter and voltage regulator circuit, for filtering and storing energy to regulate the output voltage of the voltage regulator circuit.

[0037] like Figure 4 As shown, the first filtering and voltage regulation circuit includes capacitors C4 and C24 connected in parallel. Capacitor C4 is a small-capacity capacitor, and capacitor C24 is a large-capacity capacitor. Connected in parallel and grounded, they can filter out low-frequency ripple, stabilize the input voltage, and provide instantaneous power supply through energy storage during sudden current changes, reducing voltage fluctuations. In an optional embodiment, the voltage regulation unit further includes a second filtering and voltage regulation circuit, which is connected in parallel to the input terminal of the voltage regulation circuit and is used to filter and store energy to regulate the output voltage of the voltage regulation circuit.

[0038] like Figure 4As shown, the second filtering and voltage regulation circuit includes capacitors C3 and C23 connected in parallel. C3 is a small-capacity capacitor used to filter out high-frequency ripple, such as high-frequency noise generated by the switching action of the voltage regulator circuit. C23 is a medium-capacity capacitor, mainly filtering out low-to-medium frequency ripple and voltage fluctuations, while also improving the output load capacity: when the load current changes suddenly, these capacitors can quickly release their stored energy to prevent a significant drop in output voltage. This embodiment uses a combination of small-capacity and medium-capacity capacitors to cover a wide frequency range of noise filtering, ultimately outputting a stable, low-ripple 12V DC power supply.

[0039] In other embodiments, an over-temperature protection circuit can also be connected to the MPQ4208 chip, such as... Figure 4 As shown, the over-temperature protection circuit includes resistor R49, which is connected to pin 1 (NTC) of the MPQ4208 chip to monitor the circuit temperature. When the temperature exceeds the set threshold, the resistance value of R49 changes significantly. After detecting this signal, the MPQ4208 chip shuts down the output to prevent the device from being damaged due to high temperature.

[0040] In addition, capacitors C42 and C41 connected to VCC at pin 23 provide filtering for the internal circuitry of the MPQ4208 chip, filtering out noise in the power supply and ensuring stable power supply. Pull-up resistors R43 and R44 connected to pins 20 and 21 form a pull-up circuit for the IIC communication bus, ensuring the bus is high when idle, enabling stable communication between the MPQ4208 chip and the microcontroller (including transmission of configuration commands and status feedback). Resistor R45 connected to pin 19 provides a pull-up for the interrupt signal; when the MPQ4208 chip triggers an abnormality (such as overcurrent or overtemperature), an interrupt signal can be sent to the microcontroller through pin 19. Furthermore, the FREQ, ADDR, DIR, and MODE pins of the MPQ4208 chip can be configured with operating parameters (such as PWM frequency, IIC address, and operating mode) via external resistors, allowing for flexible customization of chip functions.

[0041] This invention relates to a voltage regulation and control circuit based on a control signal preprocessing unit, a microcontroller, an input power sampling unit, and a voltage regulator unit. The microcontroller intelligently controls the voltage regulator unit by comprehensively judging the control signal from the control signal preprocessing unit and the sampled voltage from the input power sampling unit through a control program. The voltage regulator unit adjusts the voltage to output a stable voltage for ignition by the coil processing control unit. This allows for stable voltage output even under complex vehicle voltage conditions (such as cold starts and sudden load changes), ensuring effective and stable ignition and enhancing the reliability of the ignition system.

[0042] This invention also provides an internal combustion engine ignition system, which includes the aforementioned ignition circuit based on coil power supply voltage regulation.

[0043] The application scenarios of this invention include ignition control of gasoline vehicles and hybrid vehicles.

[0044] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, the embodiments of the present invention are not directed to any particular programming language. It should be understood that the content of the invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of the invention.

[0045] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0046] Similarly, it should be understood that, in order to streamline the invention and aid in understanding one or more of the various aspects of the invention, features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof in the above description of exemplary embodiments of the invention. However, this disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim.

[0047] Those skilled in the art will understand that modules in the computer device of the embodiments can be adaptively modified and placed in one or more computer devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or computer device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0048] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. An ignition circuit based on coil power supply voltage stabilization, characterized in that, The ignition circuit based on coil power supply voltage regulation includes a power supply, a control signal preprocessing unit, a microcontroller, an input power sampling unit, a voltage regulation unit, and a coil processing control unit. The control signal preprocessing unit is electrically connected to an external electronic controller and the microcontroller. The input power sampling unit is connected in parallel between the power supply and the microcontroller. The voltage regulation unit is electrically connected to the power supply and the microcontroller. The voltage regulation unit is also electrically connected to the coil processing control unit. The control signal preprocessing unit is used to acquire the control signal of the electronic controller and perform preprocessing. The input power sampling unit is used to sample the voltage of the power supply to obtain a sampling voltage. The microcontroller is used to acquire the control signal preprocessed by the control signal preprocessing unit, analyze whether the preprocessed control signal is an ignition signal, and if it is an ignition signal, acquire the sampling voltage of the input power sampling unit, analyze whether the sampling voltage is within a preset voltage range, and if the sampling voltage is within the preset voltage range, output a voltage regulation control command to the voltage regulation unit. The voltage regulator unit is used to stabilize the voltage of the power supply to a preset voltage value according to the voltage regulation control command, and provide it to the coil processing control unit for ignition.

2. The ignition circuit based on the coil power supply stabilization according to claim 1, characterized by, The voltage regulation unit includes a power management chip with integrated buck-boost control function and a voltage regulation circuit. The input terminal of the power management chip is electrically connected to the microcontroller, and the output terminal is electrically connected to the voltage regulation circuit. The power management chip is used to output buck-boost control signals to the voltage regulation circuit according to the voltage regulation control command. The input terminal of the voltage regulation circuit is also electrically connected to the power supply, and the output terminal of the voltage regulation circuit is electrically connected to the coil processing control unit. The voltage regulation unit is used to stabilize the voltage of the power supply to the preset voltage value according to the buck-boost control signal.

3. The ignition circuit based on the coil power supply stabilization according to claim 2, characterized by, The voltage regulator unit further includes an input voltage sampling circuit, an output voltage sampling circuit, and an output voltage feedback circuit. The power management chip is an MPQ4208 chip. The input voltage sampling circuit is connected in series to the input terminal of the voltage regulator circuit and is also electrically connected to the MPQ4208 chip. The output voltage sampling circuit is connected in series to the output terminal of the voltage regulator circuit and is also electrically connected to the MPQ4208 chip. The output voltage feedback circuit is also electrically connected between the output terminal of the voltage regulator circuit and the MPQ4208 chip. The input voltage sampling circuit is used to sample the input voltage of the power supply and feed it back to the MPQ4208 chip; The output voltage sampling circuit is used to sample the output voltage of the voltage regulator circuit and feed it back to the MPQ4208 chip; The output voltage feedback circuit is used to divide the output voltage and feed it back to the MPQ4208 chip; The MPQ4208 chip is used to output the buck-boost control signal to the voltage regulator circuit according to the voltage regulation control command, the sampled input voltage, the sampled output voltage, and the voltage divider of the output voltage; The voltage regulator circuit stabilizes the voltage of the power supply to a preset voltage value according to the buck-boost control signal and provides it to the coil processing control unit.

4. The ignition circuit based on the coil power supply stabilization according to claim 3, characterized by, The voltage regulator circuit is an H-bridge power circuit, which includes a buck half-bridge and a boost half-bridge connected by an inductor. The input terminal of the buck half-bridge is electrically connected to the buck signal control terminal of the MPQ4208 chip, and the input terminal of the boost half-bridge is electrically connected to the boost signal control terminal of the MPQ4208 chip. When the buck-boost control signal is a buck control signal, the buck half-bridge operates to step down the voltage of the power supply to a preset voltage value. When the buck-boost control signal is a boost control signal, the boost half-bridge operates to boost the voltage of the power supply to a preset voltage value.

5. The ignition circuit based on the coil power supply stabilization according to claim 3, characterized by, The voltage regulator unit further includes a first filtering and voltage regulation circuit, which is connected in parallel to the output terminal of the voltage regulator circuit and is used to filter and regulate the output voltage of the voltage regulator circuit.

6. The ignition circuit based on coil power supply regulation according to claim 3, characterized in that, The voltage regulator unit further includes a second filtering and voltage regulator circuit, which is connected in parallel to the input terminal of the voltage regulator circuit and is used to filter and regulate the input voltage of the voltage regulator circuit.

7. The ignition circuit based on coil power supply regulation according to claim 3, characterized in that, The microcontroller is model MC9S08SG8-PIN16.

8. The ignition circuit based on coil power supply regulation according to claim 1, characterized in that, A series voltage regulator unit is connected in series between the power supply and the microcontroller to stabilize the voltage of the power supply and provide it to the microcontroller.

9. The ignition circuit based on coil power supply regulation according to claim 1, characterized in that, The preset voltage range is 6V to 18V, and the preset voltage value is 12V.

10. An internal combustion engine ignition system, characterized in that, The internal combustion engine ignition system includes the ignition circuit based on coil power supply regulation as described in any one of claims 1-9.

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