CN113311363B - Method, device, equipment and medium for diagnosing open-circuit fault of secondary coil of engine - Google Patents

Abstract

The invention discloses a method, a device, equipment and a medium for diagnosing an open-circuit fault of a secondary coil of an engine, wherein the method comprises the following steps: acquiring voltage at a pin of a primary coil of the engine; when the voltage is greater than or equal to a preset voltage threshold value, the voltage is high voltage, and the total duration of the high voltage occurring in one ignition cycle is counted; and when the total time length is greater than or equal to a preset time length threshold value, determining that the secondary coil of the engine is in an open-circuit fault. According to the diagnosis method for the open-circuit fault of the secondary coil of the engine, whether the open-circuit fault occurs in the secondary coil can be judged only according to the voltage at the pin of the primary coil, if the open-circuit occurs in the secondary coil, the torque output of the engine is limited in time, and the functions of protecting the engine and improving the driving safety are achieved.

Description

Diagnosis method, device, equipment and medium for engine secondary coil open circuit fault

technical field

The invention relates to the technical field of engines, in particular to a diagnosis method, device, equipment and medium for an engine secondary coil open-circuit fault.

Background technique

The engine ignition system of modern automobiles collects sensor signals installed on different parts of the engine and the vehicle through the Electronic Control Unit (ECU), and selects the appropriate ignition energy to ignite the engine at the best time according to the operating conditions of the engine. The working principle of ignition is as follows: the micro control unit in the ECU outputs a control signal, turns on the driver stage switch, makes the battery charge the ignition coil, and turns off the driver stage switch to realize ignition after charging is completed. There are two ignition methods: external drive ignition and internal drive ignition. The former drive level switch is integrated in the ignition coil, and the latter drive level switch is integrated in the ECU. With the continuous increase of ignition energy demand, based on the consideration of temperature and energy distribution , The application of the internal drive ignition method is becoming more and more extensive.

With the application of numerous electronic and electrical components, numerous wires, power wires, special high voltages, ground wires, and body grounds are arranged in the vehicle, making short circuits and open circuits a common fault, and ignition coil failures, wire failures, or other factors can easily lead to ignition The circuit is over-current. When the ignition circuit is over-current, it may damage the drive stage switch of the internal drive ignition and cause the ignition function to fail, which will cause the entire ECU to be scrapped and affect the safety of driving. Therefore, it is especially important to diagnose the ignition failure of the engine in time.

However, the engine fault diagnosis in the prior art does not enable the secondary coil open circuit fault detection function, so the state of the secondary coil circuit cannot be detected in time, so it cannot fully and accurately reflect the circuit state of the secondary coil and whether the coil ignition is normal .

Contents of the invention

Embodiments of the present disclosure provide a diagnosis method, device, equipment and medium for an engine secondary coil open circuit fault. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. This summary is not an overview, nor is it intended to identify key/critical elements or delineate the scope of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

In a first aspect, an embodiment of the present disclosure provides a method for diagnosing an engine secondary coil open circuit fault, including:

Get the voltage at the pin of the primary coil of the motor;

When the voltage is greater than or equal to the preset voltage threshold, it is a high voltage, and the total duration of the high voltage in one ignition cycle is counted;

When the total duration is greater than or equal to the preset duration threshold, it is determined that the secondary coil of the engine is open-circuit faulty.

In an optional embodiment, before obtaining the voltage at the pin of the primary coil of the motor, it also includes:

Judging whether the system voltage is greater than or equal to the preset fault detection threshold;

If the system voltage is greater than or equal to the fault detection threshold, it is judged whether the engine is in a dynamic fuel cut-off state;

If it is not in the state of dynamic fuel cutoff, it is determined that the engine satisfies the enabling condition of fault detection.

In an optional embodiment, it also includes:

If the system voltage is less than the fault detection threshold, or the engine is in a dynamic fuel cut-off state, it is determined that the engine does not meet the enabling condition of fault detection.

In an optional embodiment, when the voltage is greater than or equal to the preset voltage threshold, it is a high voltage, and the total duration of the high voltage in one ignition cycle is counted, including:

After entering the detection, the fault detection timer starts counting;

When the voltage is greater than or equal to the preset voltage threshold, the high-level detection timer starts timing, and when the voltage is lower than the preset voltage threshold, the high-level detection timer stops timing;

If the time in the current fault detection timer does not reach an ignition cycle, then continue to detect, if it reaches an ignition cycle, count the total duration of high voltage occurrence recorded by the high level detection timer in an ignition cycle.

In an optional embodiment, when the total duration is less than the preset duration threshold, it is determined that there is no open circuit fault in the secondary coil of the engine.

In an optional embodiment, after determining the open circuit fault of the engine secondary coil, it also includes:

Send fault information to the vehicle's electronic control unit and limit engine torque output.

In the second aspect, an embodiment of the present disclosure provides a diagnostic device for an open-circuit fault of an engine secondary coil, including:

The voltage detection module is used to obtain the voltage at the pin of the primary coil of the engine;

Timing module, used for high voltage when the voltage is greater than or equal to the preset voltage threshold, counting the total duration of high voltage in one ignition cycle;

The diagnosis module is used to determine the open circuit fault of the secondary coil of the engine when the total duration is greater than or equal to the preset duration threshold.

In an optional embodiment, it also includes:

An enabling detection module is used to determine whether the system voltage is greater than or equal to a preset fault detection threshold;

If the system voltage is greater than or equal to the fault detection threshold, it is judged whether the engine is in a dynamic fuel cut-off state;

If it is not in the state of dynamic fuel cutoff, it is determined that the engine satisfies the enabling condition of fault detection.

In a third aspect, an embodiment of the present disclosure provides a diagnostic device for an open-circuit fault of an engine secondary coil, including a processor and a memory storing program instructions. Diagnosis method for engine secondary coil open circuit fault.

In a fourth aspect, an embodiment of the present disclosure provides a computer-readable medium, on which computer-readable instructions are stored, and the computer-readable instructions can be executed by a processor to implement the engine secondary coil open circuit fault provided by the above-mentioned embodiment. diagnostic method.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

The embodiment of the present disclosure provides a diagnosis method for the open-circuit fault of the secondary coil of the engine, by measuring the voltage at the two pins of the primary coil, and counting the total duration of high-level occurrence and the size of the fault limit in one ignition cycle, In order to determine whether there is an open circuit fault in the secondary coil. When an open circuit fault occurs, the fault information will be sent to the ECU in time, and the engine torque output will be limited in time to protect the engine and improve driving safety.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic flowchart of a method for diagnosing an open-circuit fault of an engine secondary coil according to an exemplary embodiment;

Fig. 2 is a schematic flowchart of a method for diagnosing an engine secondary coil open circuit fault according to an exemplary embodiment;

Fig. 3 is a schematic structural diagram of an ignition system according to an exemplary embodiment;

Fig. 4 is a schematic circuit diagram of an ignition coil according to an exemplary embodiment;

Fig. 5 is a schematic structural diagram of a diagnostic device for an open-circuit fault of a secondary coil of an engine according to an exemplary embodiment;

Fig. 6 is a schematic structural diagram of a diagnostic device for an open-circuit fault of a secondary coil of an engine according to an exemplary embodiment;

Fig. 7 is a schematic diagram of a computer storage medium according to an exemplary embodiment.

Reference signs:

01. Battery, 02. Fuse, 03. Ignition switch, 04. Secondary coil, 05. Distributor, 06. High voltage wire, 07. Spark plug, 08. Primary coil, 09. Ignition control module, 10. ECU.

Detailed ways

The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them.

It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of systems and methods consistent with aspects of the invention as recited in the appended claims.

In the description of the present invention, it should be understood that the terms "first", "second" and so on are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. The character "/" generally indicates that the contextual objects are an "or" relationship.

The engine fault diagnosis in the prior art does not enable the secondary coil open circuit fault detection function, so the state of the secondary coil circuit cannot be detected, so it cannot fully and accurately reflect the circuit state of the secondary coil and whether the coil ignition is normal. In the embodiment of the present disclosure, by measuring the voltage at two pins of the primary coil, and counting the total duration of high level occurrence and the size of the fault limit value in one ignition cycle, it is determined whether the secondary coil has an open-circuit fault.

The method for diagnosing the open circuit fault of the secondary coil of the engine provided by the embodiment of the present application will be described in detail below with reference to accompanying drawings 1 to 4 . Fig. 1 is a schematic flowchart of a method for diagnosing an open-circuit fault of a secondary coil of an engine according to an exemplary embodiment. Referring to Fig. 1 , the method specifically includes the following steps.

S101 acquires the voltage at the pin of the primary coil of the engine.

In a possible implementation manner, before step S101 is executed, it further includes judging whether the engine satisfies the enabling condition of fault detection at this time.

Specifically, when the engine is powered on and started normally, the detection of the fault enabling condition starts. First, the system voltage is judged to determine whether the system voltage is greater than or equal to the preset fault detection threshold. If the system voltage is greater than or equal to the fault detection threshold, continue It is judged whether the engine is in the state of dynamic fuel cutoff, and if it is not in the state of dynamic fuel cutoff, it is determined that the engine satisfies the enabling condition of fault detection. That is, when the engine meets the above two conditions at the same time, it can start to detect whether the engine has an open circuit failure of the secondary coil 04.

In an optional embodiment, it also includes: if the system voltage is lower than the fault detection threshold, or the engine is in a dynamic fuel cut-off state, it is determined that the engine does not meet the enabling conditions for fault detection, and the fault detection of the engine cannot be performed. Wherein, the fault detection threshold can be set by those skilled in the art according to the actual situation, which is not specifically limited in the embodiment of the present disclosure.

Further, if the engine satisfies the enabling conditions of fault detection, the fault detection of the engine is started, and whether an open circuit fault occurs in the secondary coil 04 can be detected according to the voltage at the two pins of the primary coil 08 .

Fig. 3 is a structural schematic diagram of an ignition system shown according to an exemplary embodiment. As shown in Fig. 3, when the engine is operating normally, the ECU 10 in Fig. 3 receives signals from various sensors on the engine, and according to the internal data of the storage The program calculates the ignition advance angle and the closing time of the ignition switch 03 under this working condition, and sends instructions to the ignition system through the ignition control module 09, and controls the on-off of the ignition switch 03 according to the instructions, wherein the ignition control module 09 is integrated in In the ECU 10 , the voltage supplied to the ignition primary coil 08 of the battery 01 is further controlled to be turned on and off.

When the circuit is turned on, current flows through the primary coil 08, and the normal ignition function is realized by periodically controlling the on-off of the ignition switch 03, that is, due to electromagnetic induction, a high induced electromotive force is generated in the secondary coil 04, It is ignited in the spark plug 07 through the high voltage line 06.

And when the ignition coil of the engine has a secondary open-circuit fault, the voltage in the secondary coil 04 cannot continue to be transmitted backwards. Due to the periodicity of ignition, the secondary coil 04 generates a reverse electromotive force at this time, that is, through electromagnetic induction to the primary coil 08 transmits the voltage, and the primary coil 08 generates a high induced electromotive force. Figure 4 is a schematic circuit diagram of the ignition coil, as shown in Figure 4, if the secondary coil 04 has an open circuit fault, the voltage at both ends of the two pins B+ and B- of the primary coil 08 will increase, and normal ignition and secondary open circuit The duration of the high voltage at both ends is different, and the duration of the open circuit will increase significantly.

According to the above analysis, it can be judged whether the secondary coil 04 has an open circuit fault by detecting the voltage at the two terminals B+ and B- of the primary coil 08 . In a possible implementation, the voltage at the two terminals B+ and B- of the primary coil 08 can be detected by a voltage detection instrument and other equipment to obtain the voltage at the pin 08 of the primary coil 08 of the engine.

S102 is high voltage when the voltage is greater than or equal to the preset voltage threshold, and counts the total duration of high voltage occurrence in one ignition cycle.

In an optional embodiment, counting the total duration of high voltage occurrence in one ignition cycle includes: after entering the detection, the fault detection timer starts timing, and when the voltage is greater than or equal to the preset voltage threshold, the high level detection timer When the voltage is less than the preset voltage threshold, the high-level detection timer stops timing; if the time in the current fault detection timer does not reach one ignition cycle, continue to detect, if it reaches one ignition cycle, count The total duration of high voltage occurrence recorded by the high level detection timer in one ignition cycle.

Specifically, when the enabling condition of the fault is satisfied, the fault monitoring of an ignition cycle is entered. In order to accurately judge the ignition condition of the ignition coil, the embodiment of the present disclosure adds two new detection timers in the ECU10, one is the fault detection timer A timer is used to record the total duration of the current detection, and a high-level detection timer is used to detect the duration of the high voltage at the pin 08 of the primary coil.

After entering the detection, the fault detection timer and the high-level detection timer are cleared, the fault detection timer starts counting, and then reads the voltage at the primary coil 08B+ and B- pins, when the voltage is greater than or equal to the preset voltage threshold When the voltage is high, the high-level detection timer starts counting. When the voltage is less than the preset voltage threshold, the high-level detection timer stops counting. Further, compare whether the time in the current fault detection timer reaches an ignition cycle. If If an ignition cycle is not reached, the next detection is continued, and if an ignition cycle is reached, the total duration of the high voltage recorded in the high-level detection timer is counted.

Among them, the preset voltage threshold can be set by those skilled in the art according to the actual situation. The embodiment of the present disclosure does not make specific limitations. In an exemplary scenario, the preset voltage threshold is 135V. If the primary coil 08B+ and B- The voltage at the pin is greater than or equal to 135V, determine that the voltage at the two pins is high voltage, and count the total time when the voltage at the two pins of the primary coil 08B+ and B- is greater than or equal to 135V.

S103, when the total duration is greater than or equal to the preset duration threshold, determine that the secondary coil of the engine is open-circuit faulty.

Further, after obtaining the total duration of the high voltage at the two pins of the primary coil 08 within an ignition cycle, it also includes judging whether the total duration of the high voltage is greater than or equal to the preset duration threshold, when the total duration is greater than or equal to the preset duration threshold , it is determined that the engine secondary coil 04 has an open-circuit fault; when the total duration is less than the preset duration threshold, it is determined that the engine secondary coil 04 has no open-circuit fault, and the timer is cleared to enter the next detection cycle.

Wherein, the preset duration threshold can be set by those skilled in the art according to the fault limit value under the current working condition, which is not specifically limited in the embodiments of the present disclosure.

According to this step, the circuit state of the secondary coil 04 can be monitored in time, and the circuit state of the secondary coil 04 and whether the ignition of the coil is normal can be fully and accurately reflected.

In an optional embodiment, after determining the open-circuit fault of the engine secondary coil 04, it further includes: sending the fault information to the electronic control unit of the vehicle, so that the driver can know the fault information in time. In an exemplary scenario, the ECU10 can The fault information is broadcasted by voice, for example, the voice prompt of "the secondary open circuit of the ignition coil is faulty, please repair it in time" is issued, and at the same time, the ECU10 limits the engine torque output through instructions. Thereby play the role of fault diagnosis and engine protection, greatly improving the safety of driving.

In order to facilitate the understanding of the diagnosis method for the open-circuit fault of the secondary coil of the engine provided by the embodiment of the present application, it will be described below with reference to FIG. 2 . As shown in Figure 2, the method includes:

When the engine is powered on and started normally, the detection of the fault enabling conditions starts. First, the system voltage is judged to determine whether the system voltage is greater than or equal to the preset fault detection threshold. If the system voltage is greater than or equal to the fault detection threshold, continue to judge whether the engine is In the state of dynamic fuel cutoff, if not in the state of dynamic fuel cutoff, it is determined that the engine satisfies the enabling condition of fault detection. That is, when the engine meets the above two conditions at the same time, it can start to detect whether the engine has a secondary coil open circuit fault.

Further, if the engine satisfies the enable condition of fault detection, the fault detection timer and the high-level detection timer are cleared, the fault detection timer starts counting, and then reads the voltage at the two pins of the primary coil B+ and B-, when When the voltage is greater than or equal to the preset voltage threshold, it is a high voltage, and the high-level detection timer starts counting, and when the voltage is lower than the preset voltage threshold, the high-level detection timer stops counting. In an exemplary scenario, the preset voltage threshold may be 135V. Further, compare whether the time in the current fault detection timer reaches an ignition cycle, if it does not reach an ignition cycle, then continue to detect next time, if it reaches an ignition cycle, then count the high level recorded in the high level detection timer The total time the voltage is present.

Further, it is judged whether the total duration of the high voltage is greater than or equal to the preset duration threshold, and when the total duration is greater than or equal to the preset duration threshold, it is determined that the engine secondary coil is open circuit fault; when the total duration is less than the preset duration threshold, it is determined that the engine secondary There is no open circuit fault in the primary coil. Wherein, the preset duration threshold can be calibrated by those skilled in the art according to the current working condition, which is not specifically limited in the embodiments of the present disclosure.

Finally, when the total duration is greater than or equal to the preset duration threshold, it is determined that the secondary coil of the engine has an open circuit fault, and the fault information is sent to the electronic control unit, and the engine torque output is limited.

According to the method for diagnosing the open-circuit fault of the secondary coil of the engine provided by the embodiment of the present disclosure, by measuring the voltage at the two pins of the primary coil, and counting the total duration of high-level occurrence and the size of the fault limit value in one ignition cycle, thereby Determine if there is an open circuit fault in the secondary coil. When an open circuit fault occurs, the fault information is sent to the ECU in time, and the engine torque output is limited to protect the engine and improve driving safety.

An embodiment of the present disclosure also provides a diagnostic device for an open-circuit fault of an engine secondary coil, which is used to implement the diagnostic method for an open-circuit fault of an engine secondary coil in the above-mentioned embodiment. FIG. 5 is a diagram according to an exemplary embodiment The structural diagram of the diagnostic device for the open circuit fault of the secondary coil of the engine is shown in Figure 5. The device includes:

A voltage detection module 501, configured to acquire the voltage at the primary coil pin of the engine;

Timing module 502, configured to be a high voltage when the voltage is greater than or equal to a preset voltage threshold, and count the total duration of the high voltage in one ignition cycle;

The diagnostic module 503 is configured to determine that the secondary coil of the engine is open-circuited when the total duration is greater than or equal to the preset duration threshold.

In an optional embodiment, it also includes:

The enable detection module is used to judge whether the system voltage is greater than or equal to the preset fault detection threshold; if the system voltage is greater than or equal to the fault detection threshold, it is judged whether the engine is in the dynamic fuel cut-off state; if it is not in the dynamic fuel cut-off state, it is determined that the engine meets the fault Enable condition for detection.

It should be noted that, when the engine secondary coil open-circuit fault diagnosis device provided by the above-mentioned embodiments executes the engine secondary coil open-circuit fault diagnosis method, it only uses the division of the above-mentioned functional modules for illustration. In practical applications, it can be based on If necessary, the above function allocation is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the device for diagnosing the open circuit fault of the secondary coil of the engine provided by the above embodiment and the embodiment of the method for diagnosing the open circuit fault of the secondary coil of the engine belong to the same concept, and its implementation process is detailed in the method embodiment, and will not be repeated here.

An embodiment of the present disclosure also provides an electronic device corresponding to the diagnosis method for the open circuit fault of the secondary coil of the engine provided in the foregoing embodiments, so as to implement the above method for diagnosing the open circuit fault of the secondary coil of the engine.

Please refer to FIG. 6 , which shows a schematic diagram of an electronic device provided by some embodiments of the present application. As shown in Figure 6, the electronic equipment includes: processor 600, memory 601, bus 602 and communication interface 603, processor 600, communication interface 603 and memory 601 are connected by bus 602; The running computer program, when the processor 600 runs the computer program, executes the diagnosis method for the open circuit fault of the secondary coil of the engine provided in any one of the above-mentioned embodiments of the present application.

Wherein, the memory 601 may include a high-speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 603 (which may be wired or wireless), and the Internet, wide area network, local network, metropolitan area network, etc. can be used.

The bus 602 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus can be divided into address bus, data bus, control bus and so on. Wherein, the memory 601 is used to store the program, and the processor 600 executes the program after receiving the execution instruction. The method for diagnosing the open-circuit fault of the secondary coil of the engine disclosed in any of the above-mentioned embodiments of the present application can be applied to the processor 600, Or implemented by the processor 600.

The processor 600 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method may be implemented by an integrated logic circuit of hardware in the processor 600 or an instruction in the form of software. The above-mentioned processor 600 can be a general-purpose processor, including a central processing unit (Central Processing Unit, referred to as CPU), a network processor (Network Processor, referred to as NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register. The storage medium is located in the memory 601, and the processor 600 reads the information in the memory 601, and completes the steps of the above method in combination with its hardware.

The electronic device provided in the embodiment of the present application is based on the same inventive concept as the method for diagnosing the open circuit fault of the engine secondary coil provided in the embodiment of the present application, and has the same beneficial effect as the method adopted, operated or implemented.

The embodiment of the present application also provides a computer-readable storage medium corresponding to the diagnosis method for the open-circuit fault of the secondary coil of the engine provided in the foregoing embodiments, please refer to FIG. 7 , the computer-readable storage medium shown is an optical disc 700, A computer program (that is, a program product) is stored thereon, and when the computer program is run by the processor, it will execute the method for diagnosing the open-circuit fault of the secondary coil of the engine provided in any of the foregoing embodiments.

It should be noted that examples of computer-readable storage media may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access Memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical and magnetic storage media will not be repeated here.

The computer-readable storage medium provided by the above-mentioned embodiments of the present application is based on the same inventive concept as the method for diagnosing the open-circuit fault of the engine secondary coil provided by the embodiments of the present application, and has a method adopted, run or implemented by the application program stored therein Same beneficial effect.

The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above examples only express several implementations of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (6)

1. A diagnostic method for an engine secondary coil open circuit fault, characterized in that, comprising: Judging whether the system voltage is greater than or equal to the preset fault detection threshold; If the system voltage is greater than or equal to the fault detection threshold, it is judged whether the engine is in a dynamic fuel cut-off state; If it is not in the dynamic fuel cut-off state, determine that the engine satisfies the enabling condition of fault detection; Get the voltage at the pin of the primary coil of the motor; When the voltage is greater than or equal to the preset voltage threshold, it is a high voltage, and the total duration of the high voltage in one ignition cycle is counted; including: after entering the detection, the fault detection timer starts counting; when the voltage is greater than or equal to the preset voltage threshold, the high-level detection timer starts counting, and when the voltage is less than the preset voltage threshold, the high-level detection timer stops counting; if the time in the current fault detection timer does not reach one ignition cycle, then continue Detection, if it reaches an ignition cycle, count the total duration of the high voltage recorded by the high level detection timer in an ignition cycle; When the total duration is greater than or equal to a preset duration threshold, it is determined that the secondary coil of the engine has an open circuit fault; Send the fault information to the electronic control unit of the vehicle, limit the engine torque output, and broadcast the fault information by voice. 2. The method according to claim 1, further comprising: If the system voltage is less than the fault detection threshold, or the engine is in a dynamic fuel cut-off state, it is determined that the engine does not meet the enabling condition of fault detection. 3 . The method according to claim 1 , wherein when the total duration is less than a preset duration threshold, it is determined that there is no open circuit fault in the secondary coil of the engine. 4 . 4. A diagnostic device for an engine secondary coil open circuit fault, characterized in that it comprises: The enable detection module is used to judge whether the system voltage is greater than or equal to a preset fault detection threshold; if the system voltage is greater than or equal to the fault detection threshold, determine whether the engine is in a dynamic fuel cutoff state; if not in the dynamic fuel cutoff state, Determine that the engine satisfies the enabling conditions for fault detection; The voltage detection module is used to obtain the voltage at the pin of the primary coil of the engine; The timing module is used for high voltage when the voltage is greater than or equal to the preset voltage threshold, and counts the total duration of the high voltage in one ignition cycle; including: after entering the detection, the fault detection timer starts counting; when the voltage When greater than or equal to the preset voltage threshold, the high-level detection timer starts counting, and when the voltage is less than the preset voltage threshold, the high-level detection timer stops counting; if the time in the current fault detection timer does not reach an ignition cycle, then continue to detect, if it reaches an ignition cycle, count the total duration of high voltage occurrence recorded by the high level detection timer in an ignition cycle; A diagnostic module, configured to determine an open-circuit fault of the secondary coil of the engine when the total duration is greater than or equal to a preset duration threshold; The control module is used to send fault information to the electronic control unit of the vehicle, limit engine torque output, and broadcast fault information by voice. 5. A diagnostic device for an open-circuit fault of an engine secondary coil, characterized in that it includes a processor and a memory stored with program instructions, the processor is configured to execute the procedures as claimed in claims 1 to 1 when executing the program instructions. 3. The diagnostic method for the open circuit fault of the secondary coil of the engine described in any one. 6. A computer-readable medium, characterized in that computer-readable instructions are stored thereon, and the computer-readable instructions can be executed by a processor to implement the engine according to any one of claims 1 to 3 Diagnosis method for secondary coil open circuit fault.

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