Ignition circuit, ignition system and vehicle

Abstract

The present invention provides an ignition circuit, an ignition system, and a vehicle. The ignition circuit includes: an on-board controller, a filtering module, and an ignition coil; the signal output end of the on-board controller is connected to the input end of the filtering module, and the signal output end of the on-board controller is used to output an initial ignition signal; the output end of the filtering module is connected to the ignition coil, and the filtering module is used to receive a first ignition signal through the input end and filter the first ignition signal to obtain a second ignition signal; the ignition coil is used to perform an ignition operation after receiving the second ignition signal. By providing the filtering module, the influence of external magnetic field interference on the initial ignition signal during transmission to the filtering module is eliminated, thereby improving the electromagnetic compatibility of the ignition coil without changing the structure of the ignition coil.

Description

Technical Field

[0001] The present invention relates to the field of electronic control technology, and in particular to an ignition circuit, an ignition system and a vehicle. Background Art

[0002] Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate within its electromagnetic environment without causing intolerable electromagnetic interference to any other device in the environment. As the electromagnetic environment in vehicles becomes increasingly complex, EMC issues are receiving increasing attention. The automotive industry has established strict EMC standards and testing specifications for vehicles.

[0003] Currently, during vehicle EMC testing, the primary cause of engine EMC failure is failure of the engine's ignition coil. The primary cause of ignition wire EMC failure is abnormal voltage induced in the wiring harness during transmission of the ignition signal to the ignition coil control module, causing the ignition coil module to receive an abnormal ignition signal, resulting in malfunction of the ignition coil. Summary of the Invention

[0004] In view of this, the present invention aims to provide an ignition circuit to solve the problem that the ignition coil in the existing vehicle fails the electromagnetic compatibility test.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] An ignition circuit includes: a vehicle-mounted controller, a filter module, and an ignition coil;

[0007] The signal output end of the vehicle-mounted controller is connected to the input end of the filter module, and the signal output end of the vehicle-mounted controller is used to output an initial ignition signal;

[0008] The output end of the filtering module is connected to the ignition coil, and the filtering module is used to receive the first ignition signal through the input end and perform a filtering operation on the first ignition signal to obtain a second ignition signal;

[0009] The ignition coil is used to perform an ignition operation after receiving the second ignition signal.

[0010] Furthermore, the filtering module includes: a control unit and multiple filtering sub-circuits, each filtering sub-circuit including a first switch and a first resistor; wherein the first resistor in at least one filtering sub-circuit is an adjustable resistor;

[0011] The multi-channel filtering sub-circuits are connected in parallel;

[0012] The control unit is connected to the multi-channel filtering sub-circuit and is used to control the switching state of the first switch and adjust the resistance value of the adjustable resistor so that the second ignition signal output by the output end of the filtering module meets the preset conditions.

[0013] Furthermore, the control unit includes a voltage sensor and a controller;

[0014] The voltage sensor is connected to the output end of the filter module and the ignition coil respectively, and is used to detect the first voltage value and / or the second voltage value of the first ignition signal and / or the second ignition signal and send them to the controller;

[0015] The controller is respectively connected to the voltage sensor, the first switch and the first resistor. The controller is used to control the switching state of the first switch and adjust the resistance value of the adjustable resistor when the first voltage value does not meet the preset voltage condition, so that the second voltage value of the second ignition signal output from the output end of the filtering module meets the preset voltage condition.

[0016] Furthermore, the controller is configured to control the first switch of the Nth filter subcircuit in the multi-path filter subcircuit to be closed and the first switches of the filter subcircuits other than the Nth filter subcircuit to be open before the filter module receives the first ignition signal through the input terminal of the filter module;

[0017] When the voltage sensor obtains a first voltage value of the first ignition signal, if it is determined that the first voltage value meets the preset voltage condition, no processing is performed; at this time, the first voltage value is equal to the second voltage value;

[0018] When a first voltage value of the first ignition signal is obtained by the voltage sensor, if it is determined that the first voltage value is greater than a preset voltage condition, if the first resistor of the Nth filter subcircuit is an adjustable resistor, adjusting the resistance of the adjustable resistor to obtain a second voltage value; if the first resistor of the Nth filter subcircuit is a fixed resistance resistor, controlling the first switch of the Nth filter subcircuit to be open, and controlling the first switch of the filter subcircuit in which the first resistor is an adjustable resistor to be closed, and adjusting the resistance of the adjustable resistor to obtain the second voltage value;

[0019] When a first voltage value of the first ignition signal is obtained by the voltage sensor, if it is determined that the first voltage value is less than a preset voltage condition, if the first resistor of the Nth filter subcircuit is an adjustable resistor, controlling the first switch of any other filter subcircuit connected in parallel with the Nth filter subcircuit to be closed, and obtaining a second voltage value by adjusting the resistance value of the adjustable resistor; if the first resistor of the Nth filter subcircuit is a fixed-resistance resistor, controlling the first switch of the filter subcircuit whose first resistor connected in parallel with the Nth filter subcircuit is an adjustable resistor to be closed, and obtaining a second voltage value by adjusting the resistance value of the adjustable resistor;

[0020] Wherein, N is an integer greater than or equal to 1.

[0021] Furthermore, the filtering module includes: a control unit and multiple filtering sub-circuits, each filtering sub-circuit includes a second switch and a second resistor; wherein the second resistor is a fixed resistance resistor;

[0022] The multi-channel filtering sub-circuits are connected in parallel;

[0023] The control unit is connected to the multi-channel filtering sub-circuit and is used to control the switching state of the second switch, and the second ignition signal outputted by the output end of the filtering module meets a preset condition.

[0024] Furthermore, the control unit includes a current sensor and a controller;

[0025] The current sensor is connected to the output end of the filter module and the ignition coil respectively, and the current sensor is used to detect the first current value and / or the second current value of the first ignition signal and / or the second ignition signal and send them to the controller;

[0026] The controller is connected to the current sensor, the first switch and the first resistor respectively. The controller is used to control the switching state of the first switch and adjust the resistance value of the adjustable resistor when the first current value does not meet the preset current condition, so that the second current value of the second ignition signal output from the output end of the filtering module meets the preset current condition.

[0027] Furthermore, the filter module is connected to the ignition coil via a first wire, and the length of the first wire is less than a preset length.

[0028] Furthermore, the ignition coil includes a primary coil and a secondary coil;

[0029] The output end of the filter module is connected to the positive pole of the primary coil through a first wire to charge the primary coil.

[0030] Compared with the prior art, the ignition circuit of the present invention has the following advantages:

[0031] The ignition circuit described in an embodiment of the present invention comprises a filter module disposed between an onboard controller and an ignition coil. The signal output terminal of the onboard controller is connected to the input terminal of the filter module, and an initial ignition signal is outputted through the signal output terminal of the onboard controller. The filter module receives a first ignition signal through its input terminal and filters the first ignition signal to obtain a second ignition signal. The filter module is also connected to the ignition coil through its output terminal, outputting the second ignition signal to the ignition coil. The ignition coil performs an ignition operation after receiving the second ignition signal. The filtering operation of the filter module on the first ignition signal ensures that the second ignition signal outputted to the ignition coil meets ignition conditions, ensuring that the ignition coil can properly ignite. The placement of the filter module between the onboard controller and the ignition coil eliminates the influence of external magnetic field interference on the initial ignition signal during transmission to the filter module, preventing the engine from suddenly slowing down or stalling during vehicle operation. This ensures the accuracy of the ignition signal transmitted to the ignition coil and improves the electromagnetic compatibility of the ignition coil without changing its structure.

[0032] Another object of the present invention is to provide an ignition system to solve the problem that the ignition coil in the existing vehicle fails the electromagnetic compatibility test.

[0033] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0034] An ignition system comprising a battery and an ignition circuit as described in any one of the above items;

[0035] The battery is connected to the vehicle-mounted controller and is used to supply power to the ignition coil through the vehicle-mounted controller and the filter module.

[0036] The advantages of the ignition system and the above-mentioned ignition circuit over the prior art are the same and will not be described in detail here.

[0037] Another object of the present invention is to provide a vehicle to solve the problem of ignition coils in existing vehicles failing electromagnetic compatibility tests.

[0038] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0039] A vehicle comprises the ignition system described above.

[0040] The advantages of the vehicle and the above-mentioned ignition circuit over the prior art are the same and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 This is a structural diagram of an ignition circuit according to an embodiment of the present invention;

[0043] Figure 2 This is a structural diagram of a filtering module according to an embodiment of the present invention;

[0044] Figure 3 This is a structural diagram of another filtering module according to an embodiment of the present invention;

[0045] Figure 4 This is a flowchart of the steps of an ignition method according to an embodiment of the present invention;

[0046] Figure 5 The figure is a schematic structural diagram of an ignition system according to an embodiment of the present invention.

[0047] Description of reference numerals:

[0048] 100 - ignition circuit, 110 - onboard controller, 210 - filter module, 310 - ignition coil, 211 - first switch, 212 - first resistor, 213 - control unit, 221 - second switch, 222 - second resistor, 200 - ignition system, 410 - battery. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0050] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] In order to enable those skilled in the art to better understand the present invention, the concepts involved in the present invention are explained below:

[0052] Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate in accordance with requirements within its electromagnetic environment and not cause intolerable electromagnetic interference to any other device in the environment. Simply put, EMC includes EMI (Electro Magnetic Interference) and EMS (Electro Magnetic Susceptibility). EMI refers to the electromagnetic interference generated by a device to its environment during normal operation; EMS refers to the degree of immunity of an appliance to the electromagnetic interference present in its environment. EMI is active, meaning it interferes with the outside world, while EMS is passive, meaning it resists external interference. Therefore, the EMC requirement for equipment is to reduce interference to others while being able to resist a considerable degree of external interference.

[0053] An ECU (Electronic Control Unit): also known as a "driving computer" or "on-board computer," it's a specialized microcomputer controller for automobiles. Like a regular computer, an on-board ECU consists of a microprocessor (MCU), memory (ROM, Read Only Memory image, RAM, Random Access Memory), input / output (I / O) interfaces, an analog-to-digital converter (A / D), and large-scale integrated circuits such as those for shaping and drivers. Simply put, the ECU is the brain of the car.

[0054] Ignition coils: Used in vehicle engine ignition systems, they provide the ignition energy needed to ignite the air-fuel mixture within the engine cylinders. Based on the principle of electromagnetic induction, the ignition coil receives commands from the ECU to open and close the coil circuit, generating an electromotive force sufficient to discharge the spark plug for ignition.

[0055] The embodiment of the present invention provides an ignition circuit 100, referring to Figure 1 , Figure 1The figure shows a schematic diagram of the structure of an ignition circuit 100 according to an embodiment of the present invention. The ignition circuit 100 includes an on-board controller 110, a filter module 210, and an ignition coil 310. The signal output terminal of the on-board controller 110 is connected to the input terminal of the filter module 210, and the signal output terminal of the on-board controller 110 is used to output an initial ignition signal. The output terminal of the filter module 210 is connected to the ignition coil 310. The filter module 210 is used to receive a first ignition signal through the input terminal and filter the first ignition signal to obtain a second ignition signal. The ignition coil 310 is used to perform an ignition operation after receiving the second ignition signal.

[0056] In an embodiment of the present invention, the on-board controller 110 may be an electronic control unit (ECU) of the vehicle, and an ignition signal is outputted through the electronic control unit. It should be noted that the ignition signal emitted by the electronic control unit is an initial ignition signal, and the ignition signal when it reaches the input end of the filter module 210 after circuit transmission is a first ignition signal, and the initial ignition signal may be different from the first ignition signal. The main reason for the difference between the initial ignition signal and the first ignition signal is that the initial ignition signal is interfered with by the external magnetic field during the circuit transmission process, resulting in a change in the voltage and / or current of the ignition signal transmitted in the circuit, thereby causing the voltage and / or current of the first ignition signal transmitted to the filter module 210 to be different from the voltage and / or current of the initial ignition signal, further causing the first ignition signal to be different from the initial ignition signal.

[0057] In this embodiment of the present invention, the signal output of the vehicle controller 110 can be connected to the input of the filter module 210 via a wiring harness. A wiring harness is a bundle of metal wires and cables bound together, used for signal transmission and power connection between devices. It is a wiring component connecting various electrical devices in a vehicle's circuits and typically includes an insulating sheath, terminal blocks, wires, and insulating wrapping material.

[0058] Optionally, the filter module 210 may be connected to the ignition coil 310 via a first wire, and the length of the first wire is less than a preset length.

[0059] It should be noted that the output end of the filter module 210 can be connected to the ignition coil 310 via a wire or wiring harness. To ensure that the second ignition signal output from the output end of the filter module 210 is not further interfered with by the external magnetic field, the distance between the filter module 210 and the ignition coil 310 can be set to a shorter distance, and the output end of the filter module 210 and the ignition coil 310 can be connected via the first wire or wiring harness.

[0060] In the embodiment of the present invention, the setting of the preset length needs to be at a distance that ensures that the second ignition signal output from the filter module 210 will not be affected by the external magnetic field and will not change. Of course, in order to ensure that the second ignition signal is not affected by the external magnetic field as much as possible, the preset length can be set as small as possible, but based on the actual circuit setting process, in order to ensure the rationality of the configuration between the devices, the size of the preset length can be appropriately set under the premise of meeting the ignition conditions. For example, the preset length can be set to 2cm (unit of length: centimeter). When the length of the first wire is less than 2cm, it can be ensured that the second ignition signal still meets the preset conditions when it is transmitted to the ignition coil 310, and the ignition coil 310 can perform the ignition operation normally after receiving the second ignition signal. The preset length can be set according to actual conditions, and is not limited by the embodiment of the present invention.

[0061] Optionally, the filtering module 210 may include: a control unit 213 and a multi-channel filtering sub-circuit, each filtering sub-circuit including a first switch 211 and a first resistor 212; wherein, the first resistor 212 in at least one filtering sub-circuit is an adjustable resistor; the multi-channel filtering sub-circuits are connected in parallel; the control unit 213 is connected in series with the multi-channel filtering sub-circuit, and is used to control the switching state of the first switch 211 and adjust the resistance value of the adjustable resistor so that the second ignition signal output from the output end of the filtering module 210 meets the preset conditions.

[0062] It should be noted that the filter module 210 can be installed in the circuit between the onboard controller 110 and the ignition coil 310; the filter module 210 can also be integrated into the ignition coil 310 to improve the electromagnetic compatibility of the ignition coil 310 itself. Of course, the filter module 210 can also be installed in the circuit between the onboard controller 110 and the ignition coil 310 and in the ignition coil 310 to further improve the electromagnetic compatibility of the ignition coil 310 in the vehicle engine. The specific location of the filter module 210 can be adjusted according to actual usage and is not limited in this embodiment of the present invention.

[0063] Reference Figure 2 , Figure 2A schematic diagram of the structure of a filter module 210 according to an embodiment of the present invention is shown. In this embodiment of the present invention, the filter module 210 may include: a control unit 213 and two filter sub-circuits, wherein the first resistor 212 of one filter sub-circuit is a fixed-resistance resistor, and the first resistor 212 of the other filter sub-circuit is an adjustable resistor; the two filter sub-circuits are connected in parallel; the control unit 213 is connected in series with the two filter sub-circuits and is configured to control the switching state of the first switch 211 and adjust the resistance value of the adjustable resistor so that the second ignition signal outputted from the output terminal of the filter module 210 meets a preset condition.

[0064] It should be noted that, in the embodiment of the present invention, the first resistor 212 in different filter sub-circuits can be an adjustable resistor or a fixed resistance resistor, but in all the filter sub-circuits of the filter module 210, it is required that the first resistor 212 of at least one filter sub-circuit is an adjustable resistor; when the first resistor 212 is a fixed resistance resistor, the resistance values ​​of the fixed resistors in different filter sub-circuits can be the same or different.

[0065] In an embodiment of the present invention, the filtering module 210 receives the first ignition signal through the input end of the filtering module 210, and performs a filtering operation on the first ignition signal to obtain a second ignition signal. Specifically, the filtering operation may be that after receiving the first ignition signal, the filtering module 210 obtains characteristic information of the first ignition signal, such as voltage information and / or current information, and determines the characteristic information through the control unit 213 in the filtering module 210. Then, the control unit 213 controls the switching state of the first switch 211 in the multi-channel filtering subcircuit in the filtering module 210 according to the determination result, and adjusts the resistance value of the variable resistor, so that the second ignition signal obtained after the filtering operation meets the preset conditions.

[0066] It should be noted that in the embodiment of the present invention, the preset condition is a condition under which the ignition coil 310 can normally ignite according to the ignition signal. The purpose of setting the preset condition is to ensure that the ignition coil 310 can normally ignite according to the second ignition signal after receiving it. For example, the initial voltage of the initial ignition signal output by the vehicle controller is 5V (voltage, voltage unit: volts). Under normal circumstances, when the voltage reaching the ignition coil is maintained at 2.6V, the ignition coil can normally ignite. When the voltage is lower than 2.6V, the ignition coil cannot normally ignite, and there is a risk of stalling or flameout. When the voltage is higher than 2.6V, the excessive voltage may burn out the ignition coil. Therefore, the preset condition can be set based on the voltage value. For example, the preset voltage condition is 2.6V. When the first voltage value meets the 2.6V condition, it indicates that the first ignition signal meets the preset condition. When the first voltage value is greater than or equal to 2.6V, it indicates that the first ignition signal does not meet the preset condition and requires filtering to obtain a second ignition signal that meets the preset condition. Of course, the preset condition can also be set according to the current value at which the ignition coil can normally perform the ignition operation, which is not limited in the embodiment of the present invention.

[0067] Optionally, the control unit 213 includes a voltage sensor and a controller;

[0068] The voltage sensor is connected to the output end of the filter module 210 and the ignition coil 310 respectively, and is used to detect the first voltage value and / or the second voltage value of the first ignition signal and / or the second ignition signal and send them to the controller;

[0069] The controller is connected in series with the voltage sensor, the first switch 211 and the first resistor 212 respectively. The controller is used to control the switching state of the first switch 211 and adjust the resistance value of the adjustable resistor when the first voltage value does not meet the preset voltage condition, so that the second voltage value of the second ignition signal output from the output end of the filtering module 210 meets the preset voltage condition.

[0070] It should be noted that because the voltage sensor is connected in series with the filter module 210, the voltage sensor can be set at either the input or output end to detect the first voltage value and / or second voltage value of the first ignition signal and / or the second ignition signal. However, because the second ignition signal is directly transmitted from the filter module 210 to the ignition coil 310, arranging the voltage sensor at the output end of the filter module 210 ensures that the second ignition signal from the filter module 210 is the ignition signal that directly reaches the ignition coil 310 and is no longer subject to interference from the external magnetic field. Of course, the voltage sensor can also be connected to the input end of the filter module 210 and the vehicle controller 110 respectively according to actual needs, and this embodiment of the present invention is not limited to this.

[0071] In an embodiment of the present invention, the voltage information of the first ignition signal is a first voltage value, and the voltage information of the second ignition signal is a second voltage value. Specifically, the preset condition may include a preset voltage condition, i.e., when the second voltage value of the second ignition signal meets the preset voltage condition, the second ignition signal meets the preset condition; similarly, when the first voltage value of the first ignition signal meets the preset voltage condition, the first ignition signal meets the preset condition.

[0072] It should be noted that if the first ignition signal meets the preset conditions, the received first ignition signal can be directly transmitted to the ignition coil 310 via the output of the filter module 210, without the filter module 210 performing any filtering operations on the first ignition signal. In other words, the first ignition signal is now equivalent to the second ignition signal and meets the preset conditions.

[0073] In an embodiment of the present invention, the voltage sensor is used to obtain the voltage value of the ignition signal and transmit the obtained voltage value to the controller. Specifically, the voltage sensor can obtain a first voltage value of the first ignition signal and a second voltage value of the second ignition signal, and transmit the first voltage value and the second voltage value to the controller. The controller determines whether the first voltage value meets the preset voltage condition based on the first voltage value and a preset voltage condition. If the first voltage value does not meet the preset voltage condition, the controller controls the switching state of the first switch 211 and adjusts the resistance value of the adjustable resistor so that the second voltage value of the second ignition signal outputted from the output end of the filter module 210 meets the preset voltage condition. Of course, if the first voltage value meets the preset voltage condition, the first ignition signal is not filtered, and the first ignition signal is equivalent to the second ignition signal. The output end of the filter module 210 directly transmits the first ignition signal to the ignition coil 310.

[0074] Optionally, the controller is used to control the first switch 211 of the Nth filter subcircuit in the multi-channel filter subcircuit to be closed and the first switch 211 of the filter subcircuit other than the Nth filter subcircuit to be open before the filter module 210 receives the first ignition signal through the input end of the filter module 210.

[0075] When the first voltage value of the first ignition signal is obtained through the voltage sensor, if it is determined that the first voltage value meets the preset voltage condition, no processing is performed; at this time, the first voltage value is equal to the second voltage value; when the first voltage value of the first ignition signal is obtained through the voltage sensor, if it is determined that the first voltage value is greater than the preset voltage condition, if the first resistor 212 of the Nth filter subcircuit is an adjustable resistor, the second voltage value is obtained by adjusting the resistance of the adjustable resistor; if the first resistor 212 of the Nth filter subcircuit is a fixed resistance resistor, the first switch 211 of the Nth filter subcircuit is controlled to be open, and the first switch 212 of the filter subcircuit whose first resistor 212 is an adjustable resistor is controlled to be open. 1 is closed, and the second voltage value is obtained by adjusting the resistance of the adjustable resistor; when the first voltage value of the first ignition signal is obtained by the voltage sensor, if it is determined that the first voltage value is less than a preset voltage condition, if the first resistor 212 of the Nth filtering sub-circuit is an adjustable resistor, the first switch 211 of any other filtering sub-circuit connected in parallel with the Nth filtering sub-circuit is controlled to be closed, and the second voltage value is obtained by adjusting the resistance of the adjustable resistor; if the first resistor 212 of the Nth filtering sub-circuit is a fixed-resistance resistor, the first switch 211 of the filtering sub-circuit whose first resistor 212 connected in parallel with the Nth filtering sub-circuit is an adjustable resistor is controlled to be closed, and the second voltage value is obtained by adjusting the resistance of the adjustable resistor.

[0076] It should be noted that, in the embodiment of the present invention, N is any integer greater than or equal to 1.

[0077] In an embodiment of the present invention, before the filtering module 210 receives the first ignition signal through the input end of the filtering module 210, the first switch 211 of the Nth filtering subcircuit in the multi-channel filtering subcircuit is controlled to be closed, and the first switches 211 of the filtering subcircuits other than the Nth filtering subcircuit are opened, so as to ensure that one of the filtering subcircuits in the filtering module 210 is in a conductive state, thereby ensuring that the ignition circuit 100 is in a conductive state. After the vehicle controller 110 outputs the ignition signal, the filtering module 210 can promptly receive the first ignition signal through the input end and perform filtering processing operations on the first ignition signal.

[0078] It should be noted that the filter module 210 controls only the first switch 211 of the Nth filter subcircuit in the multi-path filter subcircuit to be closed, while the first switches 211 of the other filter subcircuits are open. This ensures that the ignition circuit 100 is open while facilitating the controller to adjust the switch state of the first switch 211 and the resistance value of the adjustable resistor based on the voltage value. Of course, in actual applications, before the filter module 210 receives the first ignition signal through the input terminal of the filter module 210, the first switches 211 of the multi-path filter subcircuit can also be controlled to be closed, which is not limited in this embodiment of the present invention.

[0079] Reference Figure 2 , Figure 2 This is a structural diagram of a filtering module 210 according to an embodiment of the present invention. Figure 2 The filtering module 210 including two filtering subcircuits is provided to further illustrate the filtering processing operation of the filtering module 210. The filtering module 210 includes a control unit 213 and two filtering subcircuits. For ease of distinction, the two filtering subcircuits are referred to as a first filtering subcircuit and a second filtering subcircuit, respectively. The first filtering subcircuit and the second filtering subcircuit respectively include a first switch 211 and a first resistor 212. Specifically, the first resistor 212 of the first filtering subcircuit is a fixed resistance resistor, and the first resistance of the second filtering subcircuit is an adjustable resistance resistor.

[0080] Before the filter module 210 receives the first ignition signal through the input terminal of the filter module 210 , the controller in the control unit 213 controls the first switch 211 of the first filter subcircuit to be closed, and controls the first switch 211 of the second filter subcircuit to be open.

[0081] After the filter module 210 receives the first ignition signal through the input terminal, the voltage sensor in the control unit 213 obtains the first voltage value of the first ignition signal and sends the first voltage value to the controller in the control unit 213. The controller makes a determination based on the first voltage value and the preset voltage condition. Specifically, if it is determined that the first voltage value meets the preset voltage condition, no processing is performed, and the first ignition signal is output to the ignition coil 310 through the output terminal through the first filter subcircuit. At this time, the second ignition signal is equivalent to the first ignition signal. If it is determined that the first voltage value is greater than the preset voltage condition, it is first determined whether the first resistor 212 of the first filter subcircuit is an adjustable resistor. Since the first resistor 212 of the first filter subcircuit is a fixed resistance resistor, the first switch 211 of the first filter subcircuit is controlled to open and the first switch 211 of the second filter subcircuit is controlled to close. By adjusting the resistance of the adjustable resistor of the second filter subcircuit, a second voltage value meeting the preset voltage condition is obtained. The second voltage value corresponds to the second ignition signal. If the second voltage value meets the preset voltage condition, the second ignition signal meets the preset condition. At this time, the second ignition signal meets the preset condition. The second ignition signal is output to the ignition coil 310 through the output end through the second filtering subcircuit; when it is determined that the first voltage value is less than the preset voltage condition, it is first determined whether the first resistor 212 of the first filtering subcircuit is an adjustable resistor. Since the first resistor 212 of the first filtering subcircuit is a fixed resistance resistor, the first switch 211 of the second filtering subcircuit is controlled to be closed at the same time. At this time, the first filtering subcircuit and the second filtering subcircuit are connected in parallel. By adjusting the resistance value of the adjustable resistor of the second filtering subcircuit, a second voltage value that meets the preset voltage condition is obtained. The second voltage value corresponds to the second ignition signal. When the second voltage value meets the preset voltage condition, the second ignition signal meets the preset condition. At this time, the second ignition signal is output to the ignition coil 310 through the output end through the filtering subcircuit connected in parallel with the first filtering subcircuit and the second filtering subcircuit.

[0082] It should be noted that when the first voltage value is greater than the preset voltage value, if the first ignition signal is not filtered and is directly output to the ignition coil 310 through the output end of the filter module 210, when the ignition coil 310 performs an ignition operation according to the first ignition signal that is higher than the preset condition, there is a risk of burning out the ignition coil 310; when the first voltage value is less than the preset voltage value, if the first ignition signal is not filtered and is directly output to the ignition coil 310 through the output end of the filter module 210, when the ignition coil 310 performs an ignition operation according to the first ignition signal that is lower than the preset condition, the induced voltage generated by the ignition coil 310 is insufficient to discharge the spark plug, and there will be a problem of the vehicle engine slowing down or stalling.

[0083] In an embodiment of the present invention, since the ignition circuit 100 is subject to positive or negative interference from the external magnetic field during the transmission of the ignition signal, the change in the ignition signal will also be different. Specifically, when the interference from the external magnetic field is positive, the current value of the ignition circuit 100 will increase. If the resistance value of the ignition circuit 100 is not adjusted at this time, the voltage value of the ignition circuit 100 will increase with the increase in the current value. Since in the ignition circuit 100, the vehicle controller 110, the filter module 210 and the ignition coil 310 are connected in series, the voltage value of the ignition circuit 100 is equal to the sum of the voltage value of the vehicle controller 110, the voltage value of the filter module 210 and the voltage value of the ignition coil 310. When the first voltage value of the first ignition signal is greater than the preset voltage condition, it means that the interference from the external magnetic field is positive, and the current value of the ignition circuit 100 is in an increasing state. Because the total voltage value of the ignition circuit 100 is fixed, at this time, by increasing the resistance value of the filter module 210, the voltage value of the filter module 210 is increased, and at the same time, the voltage value shared by the on-board controller 110 and the voltage value of the ignition coil 310 are correspondingly reduced, thereby achieving the purpose of reducing the first voltage value to the second voltage value.

[0084] Similarly, when the interference of the external magnetic field is negative, the current value of the ignition circuit 100 will decrease. If the resistance value of the ignition circuit 100 is not adjusted at this time, the voltage value of the ignition circuit 100 will decrease as the current value decreases. When the first voltage value of the first ignition signal is less than the preset voltage condition, it means that the interference of the external magnetic field is negative, and the current value of the ignition circuit 100 is in a decreasing state. Because the total voltage value of the ignition circuit 100 is fixed, at this time, by reducing the resistance value of the filter module 210, the voltage value of the filter module 210 is reduced, and at the same time, the voltage value shared by the on-board controller 110 and the voltage value of the ignition coil 310 are increased accordingly, thereby achieving the purpose of raising the first voltage value to the second voltage value.

[0085] Optionally, the filtering module 210 may include: a control unit 213 and a multi-channel filtering sub-circuit, each filtering sub-circuit including a second switch 221 and a second resistor 222; wherein the second resistor 222 is a fixed resistance resistor; the multi-channel filtering sub-circuits are connected in parallel; the control unit 213 is connected in series with the multi-channel filtering sub-circuit, and is used to control the switching state of the second switch 221 so that the second ignition signal output from the output end of the filtering module 210 meets the preset conditions.

[0086] Reference Figure 3 , Figure 3FIG2 shows a schematic diagram of the structure of another filter module 210 according to an embodiment of the present invention. In this embodiment of the present invention, the filter module 210 may include a control unit 213 and multiple filter sub-circuits, each of which includes a second switch 221 and a second resistor 222. It should be noted that each second resistor 222 is a fixed-resistance resistor. The control unit 213 adjusts the voltage value of the filter module 210 by controlling the switching state of the second switch 221 so that the second ignition signal outputted from the output terminal of the filter module 210 meets preset conditions.

[0087] In the embodiment of the present invention, the resistance values ​​of the second resistors 222 in different filter subcircuits may be partially identical, but should avoid being completely identical. Preferably, the resistance values ​​of the second resistors 222 in the different filter subcircuits can be set in a gradient to more conveniently adjust the first ignition signal to the second ignition signal, so that the second ignition signal outputted from the output end of the filter module 210 meets a preset condition.

[0088] Specifically, based on Figure 3 Another structure of the filter module 210 is provided for further explanation of the filtering operation. Before the filter module 210 receives the first ignition signal through the input terminal of the filter module 210, the controller in the control unit 213 controls the second switch 221 of the Mth filter sub-circuit in the multi-channel filter sub-circuit to be closed, and the second switches 221 of the filter sub-circuit other than the Mth filter sub-circuit to be opened.

[0089] When the first voltage value of the first ignition signal is obtained through the voltage sensor, if it is determined that the first voltage value meets the preset voltage condition, no processing is performed, and at this time, the first voltage value is equal to the second voltage value; when the first voltage value of the first point signal is obtained through the voltage sensor, if it is determined that the first voltage value is greater than the preset voltage condition, the second switch 221 on the Mth filter circuit is controlled to be opened, and the second switch 221 of the filter subcircuit where the resistance of the second resistor 222 is greater than the resistance of the second resistor 222 of the Mth filter subcircuit is controlled to be closed, so as to obtain the second voltage value, and the second voltage value at this time is obtained through the voltage sensor, and when it is determined that the second voltage value meets the preset voltage condition, the second ignition signal is output to the ignition coil 310 through the output end, and when it is determined that the second voltage value is still greater than the preset voltage condition, the above-mentioned adjustment operation is continued; when the first point signal is obtained through the voltage sensor, When the first voltage value of the signal is determined to be less than the preset voltage condition, the second switch 221 of any filter subcircuit connected in parallel with the Mth filter subcircuit is controlled to be closed to obtain the second voltage value, and the second voltage value at this time is obtained through the voltage sensor. When it is determined that the second voltage value meets the preset voltage condition, the second ignition signal is output to the ignition coil 310 through the output end. When it is determined that the second voltage value is still less than the preset voltage condition, the second switch 221 of any filter subcircuit is controlled to be closed on the basis of the above-mentioned parallel circuit. At this time, there are three filter subcircuits in parallel connection state, and an updated second voltage value is obtained. The second voltage value at this time is obtained through the voltage sensor. When it is determined that the second voltage value meets the preset voltage condition, the second ignition signal is output to the ignition coil 310 through the output end. When it is determined that the second voltage value is still less than the preset voltage condition, the above-mentioned adjustment operation is continued.

[0090] It should be noted that, in the embodiment of the present invention, the above-mentioned adjustment operation can sort the resistance values ​​of the second resistors 222 of different filtering sub-circuits according to their size relationship. During the adjustment process, adjustments are made in order according to the size relationship of the resistance values ​​of the second resistors 222, so that the second ignition signal that meets the preset conditions can be obtained more quickly.

[0091] It should be noted that M is any integer greater than 1.

[0092] Optionally, the control unit 213 includes a current sensor and a controller; the current sensor is respectively connected to the output end of the filter module 210 and the ignition coil 310, and the current sensor is used to detect the first current value and / or second current value of the first ignition signal and / or the second ignition signal and send it to the controller; the controller is respectively connected to the current sensor, the first switch 211 and the first resistor 212, and the controller is used to control the switching state of the first switch 211 and adjust the resistance value of the adjustable resistor when the first current value does not meet the preset current condition, so that the second current value of the second ignition signal output from the output end of the filter module 210 meets the preset current condition.

[0093] It should be noted that because the current sensor is connected in series with the filter module 210, the current sensor can detect the first current value and / or second current value of the first ignition signal and / or the second ignition signal whether it is set at the input or output end. However, because the second ignition signal is directly from the filter module 210 to the ignition coil 310, setting the current sensor at the output end of the filter module 210 can ensure that the second ignition signal from the filter module 210 is an ignition signal that directly reaches the ignition coil 310 and is no longer affected by external magnetic fields. Of course, the current sensor can also be connected to the input end of the filter module 210 and the vehicle controller 110 respectively according to actual needs, and this embodiment of the present invention is not limited to this.

[0094] In the embodiment of the present invention, given a fixed resistance value of the ignition circuit 100, the voltage and current values ​​of the ignition circuit 100 are in direct proportion. In other words, the changing trend of the voltage value of the ignition circuit 100 can also be reflected by the current value. Therefore, in the embodiment of the present invention, the preset conditions may also include preset current conditions.

[0095] In an embodiment of the present invention, a current sensor and controller in the control unit 213 of the filter module 210 can be used to determine a first current value corresponding to the first ignition signal and determine whether the first current value meets a preset current condition. If the first current value does not meet the preset current condition, the switching state of the first switch 211 or the second switch 221 is controlled, and the resistance value of the adjustable resistor is adjusted so that the second current value of the second ignition signal output from the output end of the filter module 210 meets the preset current condition. Of course, if the first current value meets the preset current condition, the first ignition signal is not filtered, the first ignition signal is equivalent to the second ignition signal, and the output end of the filter module 210 directly sends the first ignition signal to the ignition coil 310.

[0096] In the embodiment of the present invention, the operation and principle of filtering the first current value of the first ignition signal are the same as the operation and principle of filtering the first voltage value of the first ignition signal, and are not repeated here.

[0097] Optionally, the ignition coil 310 includes a primary coil and a secondary coil; the output end of the filter module 210 is connected to the positive pole of the primary coil via a first wire to charge the primary coil.

[0098] In an embodiment of the present invention, the ignition coil 310 may include a primary coil, a secondary coil, and an iron core. The primary coil uses a thicker enameled wire, typically about 0.5-1 mm in diameter, wound with about 200-500 turns; the secondary coil uses a thinner enameled wire, typically about 0.1 mm in diameter, wound with about 15,000-25,000 turns. One end of the primary coil is connected to the positive pole of the low-voltage power supply on the vehicle, and the other end is connected to a switching device (e.g., a circuit breaker). The switching device is used to control the closed and open states of the ignition coil 310 circuit, thereby realizing the charging and discharging process of the ignition coil 310. One end of the secondary coil is connected to the primary coil, and the other end is connected to the high-voltage line output terminal to output high voltage electricity for ignition operation.

[0099] In an embodiment of the present invention, when the output terminal of the filter module 210 is connected to the positive terminal of the primary coil via a first wire to charge the primary coil, a strong magnetic field is generated around the primary coil as the current increases, and the iron core stores magnetic field energy. When the switching device disconnects the primary coil circuit, the magnetic field of the primary coil rapidly decays, and the secondary coil induces a high voltage, which is then output through the high-voltage output terminal for ignition. The faster the magnetic field of the primary coil disappears, the greater the current at the moment of disconnection, and the larger the turns ratio between the two coils, the higher the voltage induced by the secondary coil.

[0100] In addition, in order to achieve the above purpose, the present invention also provides an ignition method, which is implemented based on the above ignition circuit 100 and applied to the filter module 210. Figure 4 , Figure 4 A flowchart of an ignition method according to an embodiment of the present invention is shown. The ignition method may include the following steps:

[0101] Step S410: Receive a first ignition signal.

[0102] In the embodiment of the present invention, the filtering module 210 receives the first ignition signal through an input end of the filtering module 210 .

[0103] Step S420: Acquire first characteristic information of the first ignition signal.

[0104] In the embodiment of the present invention, the first characteristic information may include a first voltage value and / or a first current value.

[0105] Step S430: Determine whether the first characteristic information meets a preset condition.

[0106] In the embodiment of the present invention, if the first characteristic information meets the preset conditions, the process proceeds to step S450, and if the first characteristic information does not meet the preset conditions, the process proceeds to step S440. Specifically, the preset conditions may include preset voltage conditions and preset current conditions.

[0107] Step S440: When the first characteristic information does not meet a preset condition, filter the first ignition signal to obtain a second ignition signal.

[0108] In an embodiment of the present invention, if the first characteristic information does not meet a preset condition, a filtering operation is performed on the first ignition signal to obtain a second ignition signal. This operation may include controlling the switching state of the first switch 211 or the second switch 221 in the filtering subcircuit of the filtering module 210 and adjusting the resistance value of the adjustable resistor so that the second characteristic information of the second ignition signal outputted from the output end of the filtering module 210 meets the preset condition.

[0109] Step S450: When the first characteristic information meets a preset condition, the first ignition signal is not processed, and the second ignition signal is equal to the first ignition signal.

[0110] In an embodiment of the present invention, when it is determined that the first characteristic information meets the preset conditions, the first ignition signal corresponding to the first characteristic information is not filtered, and the first ignition signal is output to the ignition coil 310 through the output end through the filtering subcircuit. At this time, the second ignition signal is equivalent to the first ignition signal.

[0111] Step S460: output the second ignition signal through the output end.

[0112] In the embodiment of the present invention, the second ignition signal is output to the ignition coil 310 through the output end of the filter module 210. After receiving the second ignition signal, the ignition coil 310 performs an ignition operation.

[0113] The ignition circuit 100 described in this embodiment of the present invention comprises a filter module 210 disposed between an onboard controller 110 and an ignition coil 310. The filter module 210 connects the signal output of the onboard controller 110 to the input of the filter module 210, outputting an initial ignition signal via the signal output of the onboard controller 110. The filter module 210 receives a first ignition signal via its input and filters the first ignition signal to generate a second ignition signal. Furthermore, the filter module 210 connects the ignition coil 310 via its output to output the second ignition signal to the ignition coil 310. Upon receiving the second ignition signal, the ignition coil 310 performs an ignition operation. The filtering of the first ignition signal by the filter module 210 ensures that the second ignition signal output to the ignition coil 310 meets ignition conditions, ensuring that the ignition coil 310 can properly perform an ignition operation. Setting the filter module 210 between the vehicle controller 110 and the ignition coil 310 eliminates the influence of external magnetic field interference on the initial ignition signal during the process of being transmitted to the filter module 210, avoids the phenomenon of sudden engine speed reduction or flameout during vehicle driving, ensures the accuracy of the ignition signal transmitted to the ignition coil 310, and improves the electromagnetic compatibility of the ignition coil 310 without changing the structure of the ignition coil 310.

[0114] In addition, in order to achieve the above-mentioned purpose, the present invention also proposes an ignition system 200, referring to Figure 5 , Figure 5 A structural schematic diagram of an ignition system 200 according to an embodiment of the present invention is shown. The ignition system 200 may include a battery 410 and an ignition circuit 100 as described in any of the above items; the battery 410 is connected to the vehicle controller 110 and is used to supply power to the ignition coil 310 through the vehicle controller 110 and the filter module 210.

[0115] In addition, to achieve the above objectives, the present invention also provides a vehicle, which may include the ignition system 200 described above.

[0116] The above description is only a preferred embodiment of the present invention and is 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 scope of protection of the present invention.

[0117] It should be noted that the various data-related processes in the embodiments of the present application are all carried out in compliance with the corresponding data protection laws and policies of the country where they are located, and with the authorization given by the owner of the corresponding device.

Claims

1. An ignition circuit, characterized in that: include: On-board controller, filter module, ignition coil; The signal output end of the vehicle-mounted controller is connected to the input end of the filter module, and the signal output end of the vehicle-mounted controller is used to output an initial ignition signal; The output end of the filtering module is connected to the ignition coil, and the filtering module is used to receive the first ignition signal through the input end and perform a filtering operation on the first ignition signal to obtain a second ignition signal; The ignition coil is used to perform an ignition operation after receiving the second ignition signal; The filtering module includes: a control unit and multiple filtering sub-circuits, each filtering sub-circuit includes a first switch and a first resistor; wherein the first resistor in at least one filtering sub-circuit is an adjustable resistor; The multi-channel filtering sub-circuits are connected in parallel; The control unit is connected to the multi-channel filtering subcircuit and is used to control the switching state of the first switch and adjust the resistance value of the adjustable resistor so that the second ignition signal output by the output end of the filtering module meets the preset conditions; The filtering operation is performed on the first ignition signal to obtain the second ignition signal, comprising: After receiving the first ignition signal, the filtering module obtains characteristic information of the first ignition signal and determines the characteristic information through a control unit in the filtering module; The control unit controls the switching state of the first switch in the multi-channel filtering subcircuit in the filtering module according to the determination result, and adjusts the resistance value of the variable resistor to obtain the second ignition signal.

2. The ignition circuit according to claim 1, characterized in that: The control unit includes a voltage sensor and a controller; The voltage sensor is connected to the output end of the filter module and the ignition coil respectively, and is used to detect the first voltage value and / or the second voltage value of the first ignition signal and / or the second ignition signal and send them to the controller; The controller is respectively connected to the voltage sensor, the first switch and the first resistor. The controller is used to control the switching state of the first switch and adjust the resistance value of the adjustable resistor when the first voltage value does not meet the preset voltage condition, so that the second voltage value of the second ignition signal output from the output end of the filtering module meets the preset voltage condition.

3. The ignition circuit according to claim 2, characterized in that: The controller is configured to control the first switch of the Nth filter subcircuit in the multi-path filter subcircuit to be closed and the first switches of the filter subcircuit other than the Nth filter subcircuit to be open before the filter module receives the first ignition signal through the input terminal of the filter module; When the voltage sensor obtains the first voltage value of the first ignition signal, if it is determined that the first voltage value meets the preset voltage condition, no processing is performed; At this time, the first voltage value is equal to the second voltage value; When a first voltage value of the first ignition signal is obtained by the voltage sensor, if it is determined that the first voltage value is greater than a preset voltage condition, if the first resistor of the Nth filter subcircuit is an adjustable resistor, adjusting the resistance of the adjustable resistor to obtain a second voltage value; if the first resistor of the Nth filter subcircuit is a fixed resistance resistor, controlling the first switch of the Nth filter subcircuit to be open, and controlling the first switch of the filter subcircuit in which the first resistor is an adjustable resistor to be closed, and adjusting the resistance of the adjustable resistor to obtain the second voltage value; When a first voltage value of the first ignition signal is obtained by the voltage sensor, if it is determined that the first voltage value is less than a preset voltage condition, if the first resistor of the Nth filter subcircuit is an adjustable resistor, controlling the first switch of any other filter subcircuit connected in parallel with the Nth filter subcircuit to be closed, and obtaining a second voltage value by adjusting the resistance value of the adjustable resistor; if the first resistor of the Nth filter subcircuit is a fixed-resistance resistor, controlling the first switch of the filter subcircuit whose first resistor connected in parallel with the Nth filter subcircuit is an adjustable resistor to be closed, and obtaining a second voltage value by adjusting the resistance value of the adjustable resistor; Wherein, N is an integer greater than or equal to 1.

4. The ignition circuit according to claim 1, characterized in that: The filtering module includes: a control unit and multiple filtering sub-circuits, each filtering sub-circuit includes a second switch and a second resistor; wherein the second resistor is a fixed resistance resistor; The multi-channel filtering sub-circuits are connected in parallel; The control unit is connected to the multi-channel filtering sub-circuit and is used to control the switching state of the second switch, and the second ignition signal outputted by the output end of the filtering module meets a preset condition.

5. The ignition circuit according to claim 1, characterized in that: The control unit includes a current sensor and a controller; The current sensor is connected to the output end of the filter module and the ignition coil respectively, and the current sensor is used to detect the first current value and / or the second current value of the first ignition signal and / or the second ignition signal and send them to the controller; The controller is connected to the current sensor, the first switch and the first resistor respectively. The controller is used to control the switching state of the first switch and adjust the resistance value of the adjustable resistor when the first current value does not meet the preset current condition, so that the second current value of the second ignition signal output from the output end of the filtering module meets the preset current condition.

6. The ignition circuit according to claim 1, characterized in that: The filter module is connected to the ignition coil via a first wire, and a length of the first wire is less than a preset length.

7. The ignition circuit according to claim 6, characterized in that: The ignition coil includes a primary coil and a secondary coil; The output end of the filter module is connected to the positive pole of the primary coil through a first wire to charge the primary coil.

8. An ignition system, characterized in that: comprising a battery and an ignition circuit according to any one of claims 1 to 7; The battery is connected to the vehicle-mounted controller and is used to supply power to the ignition coil through the vehicle-mounted controller and the filter module.

9. A vehicle, characterized in that: Comprising the ignition system of claim 8.

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