A multi-channel fuel nozzle type, state identification detection system and detection method

Abstract

This invention discloses a multi-channel fuel injector type and status identification and detection system, comprising a main control module, a multi-channel fuel injector identification module, a human-machine interface module, and a fuel injector interface circuit. The multi-channel fuel injector identification module includes a multi-type fuel injector identification and detection circuit, a fuel injector operating current sampling circuit, and a fuel injector test channel selection circuit. This invention also discloses a detection method. This invention achieves multi-state identification (normal state, faulty state, disconnected state) of a multi-channel piezoelectric and electromagnetic fuel injector, as well as electromagnetic fuel injector internal resistance detection, reducing the need for fuel injector replacement for testing, ensuring detection accuracy, and improving maintenance efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of fuel injector detection systems, specifically to a multi-channel fuel injector type and status identification detection system and method. Background Technology

[0002] The fuel injectors for gasoline-powered passenger vehicles currently on the market are mainly classified by driving voltage as follows: 1. 12V-16V fuel injectors; 2. 70-180V fuel injectors. Automotive fuel injectors are physically classified by material type: 1. Coil electromagnetic fuel injectors; 2. Piezoelectric ceramic fuel injectors. Currently, the electromagnetic fuel injectors used in automobiles are driven by 1.12V-24V voltage, while the piezoelectric fuel injectors are driven by 70-180V voltage. When inspecting automotive fuel injectors, the current method involves using fuel injector drive devices for testing to improve efficiency. Traditional testing devices include low-pressure fuel injector devices, high-pressure fuel injector devices, coil electromagnetic fuel injector devices, and piezoelectric ceramic fuel injector devices. When testing different types of automotive fuel injectors, the corresponding drive device must be connected, making it impossible to achieve compatibility of multiple fuel injector types with a single device. This poor compatibility affects testing efficiency and increases testing costs. Furthermore, when testing electromagnetic fuel injectors with existing drive devices, the testing device needs to be replaced to test the internal resistance of the electromagnetic fuel injector. It is impossible to achieve fuel injector type identification and electromagnetic fuel injector internal resistance testing within the same testing system, increasing testing steps, affecting testing accuracy, and impacting maintenance efficiency. Summary of the Invention

[0003] This invention addresses the shortcomings of current technology by providing a multi-channel fuel injector type and status identification and detection system and method. It aims to solve the technical problem that existing technologies can only perform single-function detection of fuel injectors and cannot achieve multi-functional detection such as rapid category identification and internal resistance detection.

[0004] The technical solution adopted by the present invention to achieve the above objectives is as follows:

[0005] A multi-channel fuel injector type and status identification and detection system includes a main control module, a multi-channel fuel injector identification module, and a human-machine interaction operation module. The multi-channel fuel injector identification module and the human-machine interaction operation module are electrically connected to the main control module. The multi-channel fuel injector identification module is connected to a fuel injector interface circuit.

[0006] The main control module is used to control the operation of the multi-channel fuel injector identification module, to test and collect data on the fuel injector type identification, working current, working voltage and charging signal, and to calculate and analyze the collected data to obtain the fuel injector type (piezoelectric fuel injector, electromagnetic fuel injector), status (not connected, normal fuel injector, abnormal fuel injector) and resistance value.

[0007] The multi-channel fuel injector identification module includes a multi-type fuel injector identification and detection circuit, a fuel injector operating current sampling circuit, and a fuel injector test channel selection circuit. These circuits are interconnected. The multi-type fuel injector identification and detection circuit and the fuel injector operating current sampling circuit are electrically connected to the fuel injector interface circuit. The multi-type fuel injector identification and detection circuit is used to identify the type of fuel injector, thereby determining whether the tested fuel injector is a coil-type fuel injector or a piezoelectric ceramic fuel injector. The fuel injector operating current sampling circuit is used to test the resistance of the tested electromagnetic fuel injector, thereby detecting the resistance value. The fuel injector test channel selection circuit is used to connect and conduct, thereby cooperating with the multi-type fuel injector identification and detection circuit and the fuel injector operating current sampling circuit to perform fuel injector type and status identification or resistance testing.

[0008] As a further improvement, the main control module includes a main control chip; the multi-type fuel injector identification and detection circuit includes a fuel injector charging and discharging control circuit, a fuel injector charging signal sampling circuit, and a fuel injector voltage acquisition circuit; the fuel injector charging and discharging control circuit is used for charging and discharging control; the fuel injector charging signal acquisition circuit is used for signal acquisition during fuel injector charging; the fuel injector voltage acquisition circuit is used for identification of fuel injectors during operation and for acquiring the voltage changes required for resistance test data calculation.

[0009] The main control module has a TIMO CHO pin and a TIMO CHO NO pin. The fuel injector charging and discharging control circuit has a connection terminal one, a connection terminal two, and a fuel injector operating power connection terminal INJ Power. The connection terminal one is connected to the TIMO CHO pin, and the connection terminal two is connected to the TIMO CHO NO pin. The fuel injector charging and discharging control circuit includes MOSFETs Q1 and Q2 and a rectifier diode D2. The drain of MOSFET Q1 is connected to the fuel injector operating power connection terminal INJ Power, and the gate of MOSFET Q2 is connected to the connection terminal one. A resistor R4 is provided between the gate of MOSFET Q2 and the connection terminal one. The source of MOSFET Q1 is connected to the drain of MOSFET Q2. A resistor R7 is provided between the source of MOSFET Q1 and the drain of MOSFET Q2. The gate of MOSFET Q2 is connected to the connection terminal two. The source of MOSFET Q2 is connected to one end of the rectifier diode D2, and the other end of the rectifier diode D2 is connected to the connection terminal two.

[0010] A resistor R6 is connected in parallel between the gate and source of the MOS transistor Q1; a resistor R11 is connected in parallel between the gate and source of the MOS transistor Q2.

[0011] As a further improvement, the main control chip is provided with ADC2 and ADC1 pins; the fuel injector charging signal sampling circuit includes multiple resistors and capacitors C6, the multiple resistors including resistors R5, R8, R10 and R12 connected in series, one end of resistor R5 is connected to the fuel injector working power supply terminal INJ Power; a connection terminal three is provided between resistor R5 and resistor R8, the connection terminal three is connected to resistor R6, and the connection terminal three is connected to the fuel injector test common terminal INJ COM; one end of resistor R12 is connected to the source of the MOS transistor and one end of capacitor C6 respectively, a connection terminal four is provided between resistor R8 and resistor R10, the other end of connection terminal four and capacitor C6 are both connected to the ADC2 pin, and a resistor R9 is provided between connection terminal four and the ADC2 pin;

[0012] The fuel injector operating voltage sampling circuit includes resistors R14, R24, and R27 connected in series. The other end of resistor R14 is connected to one end of resistor R5. A connection terminal five is provided between resistor R14 and resistor R24, and connection terminal five is connected to the pin of ADC1. A resistor R17 is provided between connection terminal five and the pin of ADC1. A connection terminal six is ​​provided between resistor R17 and the pin of ADC1. A capacitor C8 is connected to connection terminal six.

[0013] As a further improvement, the main control chip is provided with an ADC0 pin; the fuel injector operating current sampling circuit includes an operational amplifier chip U1, resistor R25, and resistor R15; the operational amplifier chip U1 is provided with an NC pin, an OUT pin, a V+ pin, an NC pin, a V- pin, a +IN pin, and a -IN pin; the OUT pin is connected to the ADC0 pin, the +IN pin is connected to one end of resistor R25, the -IN pin is connected to one end of resistor R15, the other end of resistor R15 is connected to resistor R21, and the other end of resistor R21 is connected to the other end of resistor R25; one end of resistor R15 is also connected to the OUT pin; a capacitor C7 is connected to the V+ pin;

[0014] A resistor R26 is provided between the ADC0 pin and the OUT pin. A connection terminal seven is provided between the resistor R26 and the ADC0 pin, and a capacitor C9 is connected to the connection terminal seven. A connection terminal eight is provided between the capacitor C7 and the V+ pin, and an inductor FB2 is connected to the connection terminal eight. A resistor R16 is also provided between one end of the resistor R15 and the OUT pin. One or more resistors R22 are connected in parallel between the resistors R25 and R15. A connection terminal nine is provided between the resistors R25 and R21, and a current sampling connection terminal OCOM is connected to the current sampling connection terminal OCOM, which is connected to the fuel injector test channel selection circuit. A Zener diode DZ1 is also connected between the +IN pin and the -IN pin.

[0015] As a further improvement, the main control chip also has multiple drive pins IJ OPWM; the fuel injector test channel selection circuit includes multiple sets of fuel injector connection circuits, which are connected in parallel; each set of fuel injector connection circuits includes a conducting MOSFET Q, resistor R13, and resistor R19. The source of the conducting MOSFET Q is connected to the current sampling connection terminal OCOM, and the drain of the conducting MOSFET Q is connected to the fuel injector test common terminal INJ COM; a Zener diode D3 is provided between the drain of the conducting MOSFET Q and the fuel injector test common terminal INJ COM, and a connection terminal 10 is provided between the Zener diode D3 and the drain of the conducting MOSFET Q, which is connected to the fuel injector interface circuit; one end of resistor R13 has a P+ connection terminal, which is used to connect to a 12V power supply; the other end of resistor R13 is connected to the gate of the conducting MOSFET Q and the drive pin IJ. OPWM connection; a connection terminal eleven is provided between the other end of the resistor R13 and the gate of the conducting MOS transistor Q; the connection terminal eleven is connected to one end of the resistor R19;

[0016] The fuel injector connection circuit also includes a transistor Q4. The base of transistor Q4 is connected to the drive pin IJ OPWM, the collector of transistor Q4 is connected to the resistor R13, and the emitter of transistor Q4 is connected to the other end of the resistor R19. The other end of the resistor R19 is also provided with a resistor R20, which is connected to the base of transistor Q4. A resistor R18 is provided between transistor Q4 and the drive pin IJ OPWM.

[0017] As a further improvement, the fuel injector interface circuit includes multiple IJContr pins and INJECT pins. The IJContr pins are respectively connected to the connection terminal 1, and each IJContr pin is connected to one of the terminals of the fuel injector, thereby realizing the function of electrical connection and conduction control of multiple fuel injectors; the INJECT pin is connected to one end of the resistor R6, and the INJECT pin is connected to the other terminal of the fuel injector.

[0018] The main control chip has a USART2 TX pin and a USART2 RX pin; the human-machine interaction module includes a display chip P1 and an inductor FB1. The display chip P1 has a TX pin and an RX pin. The TX pin is connected to the USART2 TX pin, and the RX pin is connected to the USART2 RX pin. Resistors are provided between the TX pin and the USART2 TX pin, and between the RX pin and the USART2 RX pin. One end of the inductor FB1 is connected to the display chip P1, and the other end of the inductor FB1 is connected to the P+ terminal.

[0019] As a further improvement, the main control chip also includes a running indicator pin, a system pressure sensor pin, an error reporting drive output pin, a VBAT pin, and multiple sets of power supply pins; the running indicator pin is connected to a running indicator module; the system pressure sensor pin is connected to a pressure sensor module; each of the multiple sets of power supply pins includes a VDD pin and a VSS pin, and a capacitor C is connected between the VDD pin and the VSS pin.

[0020] The VDD pin, VBAT pin, and the other end of the inductor FB2 are all connected to a power supply terminal S, which is used to provide a 3V3 power supply. The VBAT pin is also equipped with a capacitor C1. The capacitor C1, the VSS pin, the other end of resistor R12, the other end of resistor R27, capacitor C8, capacitor C9, the V- pin, the emitter of transistor Q4, and the connection point of resistor R19 are all connected to a GND terminal, which is used to connect to the negative terminal of the power supply.

[0021] A detection method for implementing the multi-channel fuel injector type and status identification and detection system includes the following steps;

[0022] (1) Connecting and powering on the fuel injector: Connect the fuel injector to be tested to the fuel injector interface circuit respectively, and use a socket connection structure for electrical connection, so that one terminal of the fuel injector is connected to the IJ Contr pin terminal, and the other terminal of the fuel injector is connected to the IN JECT pin terminal; start the multi-channel fuel injector type and status identification detection system for power-on test;

[0023] (2) Injector type identification: After startup, the main control chip controls the multi-type injector identification and detection circuit to open each injector one by one for charging and discharging. The voltage change data obtained from the charging and discharging actions is fed back to the main control chip for processing. The main control chip feeds back the test results to the human-machine interaction module based on the obtained voltage change data, and determines the type and status of the tested injector, whether it is a piezoelectric injector or an electromagnetic injector, and whether the test channel is in the state of injector disconnection, injector normal, injector abnormal, or short circuit. When the test voltage change remains low and the voltage does not change during the test period, the main control chip determines that the injector is an electromagnetic injector and then proceeds to the next test step. When the tested injector is a piezoelectric ceramic injector, injector disconnection, injector abnormal, or short circuit, the injector in the abnormal state is intuitively fed back to the tester through the human-machine interaction module, and the tester further confirms it.

[0024] (3) Internal resistance test of electromagnetic fuel injector: The main control chip tests each electromagnetic fuel injector identified by fuel injector type, closes the channel of non-electromagnetic fuel injectors, and then drives the electromagnetic fuel injector to perform internal resistance test; the main control chip drives the fuel injector working current sampling circuit to drive the fuel injector connection circuit connected to the electromagnetic fuel injector, and the data after driving is fed back to the main control chip for data processing. After processing, the data is displayed through the human-machine interaction module so that the tester knows the test data and understands the status of the electromagnetic fuel injector.

[0025] (4) Test completed: The main control chip stores the test data, then performs data analysis and displays it on the display chip P1. The tester will confirm and classify the fuel injectors according to the displayed information, and then connect the next group of fuel injectors to be tested. The entire identification and inspection process is completed.

[0026] As a further improvement, step (2) of the detection method further includes the following steps:

[0027] When the main control chip is tested in step 2.1, the fuel injector test channel selection circuit is controlled to select the fuel injector test channel to be identified, and the fuel injector charge and discharge control circuit controls the fuel injector to perform charge and discharge actions.

[0028] Step 2.2 Discharge process: The driving pin IJ OPWM outputs a low level to control the source and drain of the selected injector channel's conducting MOSFET Q to conduct; the driving pin TIMO CHO outputs a low level to control the source and drain of MOSFET Q1 to turn off; the driving pin TIMO CH0 ON outputs a high level to control the source and drain of MOSFET Q2 to conduct. The selected injector channel's conducting MOSFET Q and MOSFET Q2 form a current loop to consume the electricity stored in the injector.

[0029] Step 2.3 After discharging, charging begins. After discharging, the charging process begins. The main control chip drives the IJ OPWM pin to output a low level to control the source and drain of the selected injector channel's MOSFET Q to conduct. The TIMOCHO pin and TIM0 CH0 ON pin drive the TIMOCHO pin to output a low level to control the source and drain of MOSFET Q1 and MOSFET Q2 to turn off. The injector test power supply charges the selected injector channel through resistor R5. The injector charging signal sampling circuit composed of resistors R5, R8, R10, and R12 collects the charging signal. The charging voltage signal is divided and fed back to the ADC2 pin of the main control chip through resistor R9. The ADC2 pin feeds back the collected charging process electrical signal (0-3.3V) to the main control chip. The selected injector's working power supply signal is divided by resistors R14, R15, and R16 and fed back to the ADC1 pin of the main control chip through resistor R17 for acquisition.

[0030] The current generated during the operation of the selected fuel injector passes through resistors R21 and R22 to generate a current signal. The current signal is amplified by operational amplifier chip U1, and the amplified current signal is fed back to the ADC0 pin of the main control chip for acquisition. During the charging process of the selected fuel injector, the main control chip continuously acquires data from the ADC1 and ADC2 pins. The acquired data is stored in the main control chip, which then performs type and status identification.

[0031] Step 2.4 Fuel Injector Identification: The main control chip uses waveform curve data to make the following judgments to identify the fuel injector type and status, wherein the test time is T0-T1, T1-T20, and the voltage is 0V-3.3V;

[0032] When the selected channel is not connected to the fuel injector: the charge in the piezoelectric fuel injector is discharged from the test time T0 to T1; the fuel injector is charged from the start of the test time T1. Since there is no current during the charging process, the voltage waveform has only one high pulse and maintains the highest voltage waveform from the test time T1 to T20. The main control chip determines that the fuel injector is not connected by calculating and comparing the charging waveform curve data, referring to the waveform diagram and analyzing the data values.

[0033] When a normal piezoelectric injector is connected to the selected channel: the charge inside the piezoelectric injector is discharged during the test time T0 to T1; the injector begins to be charged at the start of the test time T1. As the current changes continuously from large to small during the charging process, there is a clear charging curve waveform during the test time T1-T20. The charging time is normal. The main control chip determines that the injector is a normal piezoelectric ceramic injector by calculating and comparing the waveform curve data, referring to the waveform diagram, and analyzing the data values.

[0034] When the selected channel is connected to an abnormal piezoelectric ceramic injector: the charge inside the piezoelectric ceramic injector is discharged during the test time T0 to T1; the piezoelectric ceramic injector begins to charge at the start of the test time T1. Because the current changes continuously from large to small during the charging process, there is an obvious charging curve waveform during the test time T1-T20, but the charging time is short. The main control chip determines the existence of a charging abnormality in the piezoelectric ceramic injector by calculating and comparing the waveform curve data, referring to the waveform diagram, and analyzing the data values.

[0035] When the selected channel is connected to the electromagnetic injector: the charge in the piezoelectric injector is discharged from the test time T0 to T1; the injector starts charging at the start of the test time T1. Because a large current is maintained during the charging process, the waveform remains low during the test time T1-T20. The main control chip determines the electromagnetic injector by calculating and comparing the waveform curve data, referring to the waveform diagram and analyzing the data values.

[0036] As a further improvement, step (3) of the detection method includes the following steps:

[0037] Step 3.1 Measurement Reset Enters Electromagnetic Injector Internal Resistance Test: Close all injector connection circuits, the main control chip drives the injector working current sampling circuit to select one group of injector connection circuits to enter the electromagnetic injector internal resistance test.

[0038] Step 3.2 Injector Internal Resistance Measurement: The injector internal resistance measurement driver is activated. The main control chip's IJ OPWM pin outputs a low / high level to control the selected injector channel's conduction, turning on the source and drain of MOSFET Q. The TIM0 CH0 pin outputs a high level to control the source and drain of MOSFET Q1. The TIM0 CH0 ON pin outputs a low level to control the source and drain of MOSFET Q2. The injector test power supply current charges the selected channel injector through resistor R5. Resistors R5, R8, R10, and R12 form the injector charging signal circuit. The charging voltage signal is divided and fed back to the main control chip's ADC2 pin through resistor R9. The ADC2 pin acquires the charging process electrical signal (0-3.3V). The injector operating power supply voltage signal is divided by resistors R14, R15, and R16 and then... R17 feeds back to the ADC1 pin of the main control chip for acquisition. The current generated during the operation of the fuel injector is collected by resistors R21 and R22. A current signal is generated across resistors R21 and R22, which is amplified by operational amplifier chip U1. The amplified current signal is then fed back to the ADC0 pin of the main control chip. During the fuel injector resistance test, the main control chip continuously samples the ADC1 and ADC0 pins. The sampled data is stored in the main control chip. After sampling is completed, the main control chip calculates the internal resistance of the fuel injector.

[0039] Step 3.3 Perform fuel injector resistance measurement on all control injector channels: After the selected electromagnetic injector has been tested, the main control chip detects that there is another electromagnetic injector to be tested, and performs the test on another electromagnetic injector. Repeat steps 3.1-3.3 until all connected electromagnetic injectors have been tested and then exit; if no test is required, exit the test directly.

[0040] The beneficial effects of this invention are as follows: By setting up a multi-channel fuel injector type and status identification and detection system, this invention can determine whether multiple fuel injectors are damaged, not charging, or exhibit normal charging and charge retention phenomena. This allows for the identification of fuel injectors in an unconnected state, as well as the diagnosis of coil electromagnetic or piezoelectric fuel injectors after normal connection. It also identifies fuel injector abnormalities and short circuits, enabling the detection of different types of automotive fuel injectors, improving compatibility, increasing testing efficiency, and reducing testing costs. Furthermore, it enables internal resistance testing of detected electromagnetic fuel injectors, allowing for individual testing of each electromagnetic fuel injector, ensuring consistency while improving the accuracy of resistance detection. This multi-channel fuel injector type and status identification and detection system can perform fuel injector identification and internal resistance testing of electromagnetic fuel injectors, reducing the need for fuel injector replacement devices for testing, ensuring detection accuracy, and improving maintenance efficiency.

[0041] The main control module is used for controlling and identifying the type of fuel injector, controlling and testing the internal resistance of the identified electromagnetic fuel injector, and providing feedback on the test results. A multi-channel fuel injector identification module, consisting of a multi-type fuel injector identification and detection circuit, a fuel injector operating current sampling circuit, and a fuel injector test channel selection circuit, is used to detect fuel injectors. The multi-type fuel injector identification and detection circuit identifies the type of fuel injector, determining whether it is a coil fuel injector or a piezoelectric ceramic fuel injector. The fuel injector operating current sampling circuit tests the resistance of the detected electromagnetic fuel injector, thus detecting the resistance value. The fuel injector test channel selection circuit is used for connection and conduction, thereby cooperating with the multi-type fuel injector identification and detection circuit and the fuel injector working current sampling circuit to perform fuel injector type identification or resistance testing. The multi-type fuel injector identification and detection circuit, composed of a fuel injector charge / discharge control circuit, a fuel injector charging signal sampling circuit, and a fuel injector voltage acquisition circuit, is used to control the testing action. The fuel injector charge / discharge control circuit is used for charge / discharge control; the fuel injector charging signal acquisition circuit is used for signal acquisition during fuel injector charging; and the fuel injector working voltage sampling circuit is used for acquiring voltage changes during fuel injector operation.

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the multi-channel fuel injector type and status identification and detection system in this embodiment;

[0045] Figure 2 This is a schematic diagram of the circuit principle of the multi-channel fuel injector type and status identification and detection system in this embodiment;

[0046] Figure 3 This is a schematic diagram of the main control chip of the multi-channel fuel injector type and status identification and detection system in this embodiment;

[0047] Figure 4 This is a schematic diagram of the circuit principle of the human-computer interaction operation module in this embodiment;

[0048] Figure 5 This is a schematic diagram of the circuit principle of the fuel injector interface circuit in this embodiment;

[0049] Figure 6 This is an exploded view of the chassis body in this embodiment;

[0050] Figure 7 This is a schematic diagram of the circuit principle of the fuel injector working current sampling circuit in this embodiment;

[0051] Figure 8 This is a schematic diagram of the circuit principle for selecting the fuel injector test channel in this embodiment;

[0052] Figure 9 This is a flowchart illustrating the detection method of this embodiment;

[0053] Figure 10 This is a schematic diagram of the waveform curve judgment of the detection method in this embodiment. Detailed Implementation

[0054] The following description is only a preferred embodiment of the present invention and does not limit the scope of protection of the present invention.

[0055] For examples, see the appendix. Figures 1-10 A multi-channel fuel injector type and status identification and detection system 1 includes a main control module 2, a multi-channel fuel injector identification module 3, and a human-machine interaction operation module 4. The multi-channel fuel injector identification module 3 and the human-machine interaction operation module 4 are electrically connected to the main control module 2. The multi-channel fuel injector identification module 3 is connected to a fuel injector interface circuit 6.

[0056] The main control module 2 is used to control the operation of the multi-channel fuel injector identification module 3, to test and collect data on the fuel injector type identification, working current, working voltage and charging signal, and to calculate and analyze the collected data to obtain the fuel injector type (piezoelectric fuel injector, electromagnetic fuel injector), status (not connected, normal fuel injector, abnormal fuel injector) and resistance value.

[0057] The multi-channel fuel injector identification module 3 includes a multi-type fuel injector identification and detection circuit 7, a fuel injector operating current sampling circuit 8, and a fuel injector test channel selection circuit 9. The multi-type fuel injector identification and detection circuit 7, the fuel injector operating current sampling circuit 8, and the fuel injector test channel selection circuit 9 are interconnected. The multi-type fuel injector identification and detection circuit 7 and the fuel injector operating current sampling circuit 8 are electrically connected to the fuel injector interface circuit 6. The multi-type fuel injector identification and detection circuit 7 is used for identifying the type of fuel injector, thereby determining whether the tested fuel injector is a coil-type fuel injector or a piezoelectric ceramic fuel injector. The fuel injector operating current sampling circuit 8 is used to test the resistance of the tested electromagnetic fuel injector, thereby detecting the resistance value. The fuel injector test channel selection circuit 9 is used for connection and conduction, thereby cooperating with the multi-type fuel injector identification and detection circuit 7 and the fuel injector operating current sampling circuit 8 to perform fuel injector type, status identification, or resistance testing.

[0058] The main control module 2 includes a main control chip; the multi-type fuel injector identification and detection circuit 7 includes a fuel injector charging and discharging control circuit 8, a fuel injector charging signal sampling circuit 9, and a fuel injector voltage acquisition circuit 10; the fuel injector charging and discharging control circuit 8 is used for charging and discharging control; the fuel injector charging signal acquisition circuit is used for signal acquisition during fuel injector charging; the fuel injector voltage acquisition circuit 10 is used for identification of fuel injectors during operation and for acquiring the voltage changes required for resistance test data calculation.

[0059] The main control module 2 has a TIMO CHO pin and a TIMO CHO NO pin. The fuel injector charging and discharging control circuit 8 has a connection terminal 1, a connection terminal 2, and a fuel injector operating power connection terminal INJ Power. The connection terminal 1 is connected to the TIMO CHO pin, and the connection terminal 2 is connected to the TIMO CHO NO pin. The fuel injector charging and discharging control circuit 8 includes MOSFET Q1, MOSFET Q2, and rectifier diode D2. The drain of MOSFET Q1 is connected to the fuel injector operating power connection terminal INJ Power. In the power connection, the gate of MOSFET Q2 is connected to connection terminal one, and a resistor R4 is provided between the gate of MOSFET Q2 and connection terminal one; the source of MOSFET Q1 is connected to the drain of MOSFET Q2; a resistor R7 is provided between the source of MOSFET Q1 and the drain of MOSFET Q2; the gate of MOSFET Q2 is connected to connection terminal two; the source of MOSFET Q2 is connected to one end of rectifier diode D2, and the other end of rectifier diode D2 is connected to connection terminal two;

[0060] A resistor R6 is connected in parallel between the gate and source of the MOS transistor Q1; a resistor R11 is connected in parallel between the gate and source of the MOS transistor Q2.

[0061] The main control chip has an ADC2 pin and an ADC1 pin. The fuel injector charging signal sampling circuit 9 includes multiple resistors and a capacitor C6. The multiple resistors include resistors R5, R8, R10, and R12 connected in series. One end of resistor R5 is connected to the fuel injector power supply terminal INJ Power. A connection terminal three is provided between resistor R5 and resistor R8. The connection terminal three is connected to resistor R6 and is connected to the fuel injector test common terminal INJ COM. One end of resistor R12 is connected to the source of the MOS transistor and one end of capacitor C6. A connection terminal four is provided between resistor R8 and resistor R10. The other end of connection terminal four and capacitor C6 are both connected to the ADC2 pin. A resistor R9 is provided between connection terminal four and the ADC2 pin.

[0062] The fuel injector operating voltage sampling circuit includes resistors R14, R24, and R27 connected in series. The other end of resistor R14 is connected to one end of resistor R5. A connection terminal five is provided between resistor R14 and resistor R24, and connection terminal five is connected to the pin of ADC1. A resistor R17 is provided between connection terminal five and the pin of ADC1. A connection terminal six is ​​provided between resistor R17 and the pin of ADC1. A capacitor C8 is connected to connection terminal six.

[0063] The main control chip has an ADC0 pin; the fuel injector operating current sampling circuit 8 includes an operational amplifier chip U1, a resistor R25, and a resistor R15; the operational amplifier chip U1 has an NC pin, an OUT pin, a V+ pin, an NC pin, a V- pin, a +IN pin, and a -IN pin; the OUT pin is connected to the ADC0 pin, the +IN pin is connected to one end of the resistor R25, the -IN pin is connected to one end of the resistor R15, the other end of the resistor R15 is connected to a resistor R21, and the other end of the resistor R21 is connected to the other end of the resistor R25; one end of the resistor R15 is also connected to the OUT pin; the V+ pin is connected to a capacitor C7.

[0064] A resistor R26 is provided between the ADC0 pin and the OUT pin. A connection terminal seven is provided between the resistor R26 and the ADC0 pin, and a capacitor C9 is connected to the connection terminal seven. A connection terminal eight is provided between the capacitor C7 and the V+ pin, and an inductor FB2 is connected to the connection terminal eight. A resistor R16 is also provided between one end of the resistor R15 and the OUT pin. One or more resistors R22 are connected in parallel between the resistors R25 and R15. A connection terminal nine is provided between the resistors R25 and R21, and a current sampling connection terminal OCOM is connected to the current sampling connection terminal OCOM, which is connected to the fuel injector test channel selection circuit 9. A Zener diode DZ1 is also connected between the +IN pin and the -IN pin, and the Zener diode DZ1 is used for voltage regulation.

[0065] The main control chip also has multiple drive pins IJ OPWM; the fuel injector test channel selection circuit 9 includes multiple sets of fuel injector connection circuits, which are connected in parallel; each set of fuel injector connection circuits includes a conducting MOSFET Q, resistor R13, and resistor R19. The source of the conducting MOSFET Q is connected to the current sampling connection terminal OCOM, and the drain of the conducting MOSFET Q is connected to the fuel injector test common terminal INJ COM; a Zener diode D3 is provided between the drain of the conducting MOSFET Q and the fuel injector test common terminal INJ COM, and a connection terminal 10 is provided between the Zener diode D3 and the drain of the conducting MOSFET Q, which is connected to the fuel injector interface circuit 6; one end of the resistor R13 has a P+ connection terminal, which is used to connect to a 12V power supply; the other end of the resistor R13 is connected to the gate of the conducting MOSFET Q and the drive pin IJ. OPWM connection; a connection terminal eleven is provided between the other end of the resistor R13 and the gate of the conducting MOS transistor Q; the connection terminal eleven is connected to one end of the resistor R19;

[0066] The fuel injector connection circuit also includes a transistor Q4. The base of transistor Q4 is connected to the drive pin IJ OPWM, the collector of transistor Q4 is connected to the resistor R13, and the emitter of transistor Q4 is connected to the other end of the resistor R19. The other end of the resistor R19 is also provided with a resistor R20, which is connected to the base of transistor Q4. A resistor R18 is provided between transistor Q4 and the drive pin IJ OPWM.

[0067] The fuel injector interface circuit 6 includes multiple IJ Contr pins and IN JECT pins. The IJ Contr pins are respectively connected to the connection terminal 10, and each IJ Contr pin is connected to one of the terminals of the fuel injector, thereby realizing the function of electrical connection and conduction control of multiple fuel injectors. The IN JECT pin is connected to one end of the resistor R6, and the IN JECT pin is connected to the other terminal of the fuel injector.

[0068] The main control chip has a USART2 TX pin and a USART2 RX pin; the human-machine interaction module 4 includes a display chip P1 and an inductor FB1. The display chip P1 has a TX pin and an RX pin. The TX pin is connected to the USART2 TX pin, and the RX pin is connected to the USART2 RX pin. Resistors are provided between the TX pin and the USART2 TX pin, and between the RX pin and the USART2 RX pin. One end of the inductor FB1 is connected to the display chip P1, and the other end of the inductor FB1 is connected to the P+ connection terminal.

[0069] The main control chip also includes a running indicator pin, a system pressure sensor pin, an error reporting drive output pin, a VBAT pin, and multiple power supply pins; the running indicator pin is connected to a running indicator module; the system pressure sensor pin is connected to a pressure sensor module; each of the multiple power supply pins includes a VDD pin and a VSS pin, and a capacitor C is connected between the VDD pin and the VSS pin.

[0070] The VDD pin, VBAT pin, and the other end of the inductor FB2 are all connected to a power supply terminal S, which is used to provide a 3V3 power supply. The VBAT pin is also equipped with a capacitor C1. The capacitor C1, the VSS pin, the other end of resistor R12, the other end of resistor R27, capacitor C8, capacitor C9, the V- pin, the emitter of transistor Q4, and the connection point of resistor R19 are all connected to a GND terminal, which is used to connect to the negative terminal of the power supply.

[0071] A detection method for implementing the multi-channel fuel injector type and status identification and detection system 1 includes the following steps;

[0072] (1) Connecting and powering on the fuel injector: Connect the fuel injector to be tested to the fuel injector interface circuit 6 respectively, and use a socket connection structure for electrical connection, so that one terminal of the fuel injector is connected to the IJ Contr pin terminal, and the other terminal of the fuel injector is connected to the IN JECT pin terminal; start the multi-channel fuel injector type and status identification and detection system 1 for power-on test;

[0073] (2) Injector type identification: After startup, the main control chip controls the multi-type injector identification and detection circuit 7 to open each injector one by one for charging and discharging. The voltage change data obtained from the charging and discharging actions is fed back to the main control chip for processing. The main control chip feeds back the test results to the human-machine interaction module 4 based on the obtained voltage change data, and determines the type and status of the tested injector, whether it is a piezoelectric injector or an electromagnetic injector, and whether the test channel is in the state of injector disconnection, injector normal, injector abnormal, or short circuit. When the test voltage change remains low and the voltage does not change during the test period, the main control chip determines that the injector is an electromagnetic injector and then proceeds to the next test step. When the tested injector is a piezoelectric ceramic injector, injector disconnection, injector abnormal, or short circuit, the injector in the abnormal state is intuitively fed back to the tester through the human-machine interaction module, and the tester further confirms it.

[0074] (3) Internal resistance test of electromagnetic fuel injector: The main control chip tests each electromagnetic fuel injector identified by fuel injector type, closes the channel of non-electromagnetic fuel injectors, and then drives the electromagnetic fuel injector to perform internal resistance test; The main control chip drives the fuel injector working current sampling circuit 8 to drive the fuel injector connection circuit connected to the electromagnetic fuel injector, and the data after driving is fed back to the main control chip for data processing. After processing, the data is displayed through the human-machine interaction module 4 so that the tester knows the test data and understands the status of the electromagnetic fuel injector;

[0075] (4) Test completed: The main control chip stores the test data, then performs data analysis and displays it on the display chip P1. The tester will confirm and classify the fuel injectors according to the displayed information, and then connect the next group of fuel injectors to be tested. The entire identification and inspection process is completed.

[0076] Step (2) of the detection method further includes the following steps:

[0077] When the main control chip is tested in step 2.1, the fuel injector test channel selection circuit 9 is controlled to select the fuel injector test channel to be identified, and the fuel injector charge and discharge control circuit 8 controls the fuel injector to perform charge and discharge actions.

[0078] Step 2.2 Discharge process: The driving pin IJ OPWM outputs a low level to control the source and drain of the selected injector channel's conducting MOSFET Q to conduct; the driving pin TIMO CHO outputs a low level to control the source and drain of MOSFET Q1 to turn off; the driving pin TIMO CH0 ON outputs a high level to control the source and drain of MOSFET Q2 to conduct. The selected injector channel's conducting MOSFET Q and MOSFET Q2 form a current loop to consume the electricity stored in the injector.

[0079] Step 2.3 After discharging, charging begins. After discharging, the charging process begins. The main control chip drives the IJ OPWM pin to output a low level to control the source and drain of the selected injector channel's MOSFET Q to conduct. The TIMOCHO pin and TIM0 CH0 ON pin drive the TIMOCHO pin to output a low level to control the source and drain of MOSFET Q1 and MOSFET Q2 to turn off. The injector test power supply charges the selected injector channel through resistor R5. The injector charging signal sampling circuit 9, composed of resistors R5, R8, R10, and R12, collects the charging signal. The charging voltage signal is divided and fed back to the ADC2 pin of the main control chip through resistor R9. The ADC2 pin feeds back the collected charging process electrical signal (0-3.3V) to the main control chip. The selected injector's working power supply signal is divided by resistors R14, R15, and R16 and fed back to the ADC1 pin of the main control chip through resistor R17 for acquisition.

[0080] The current generated during the operation of the selected fuel injector passes through resistors R21 and R22 to generate a current signal. The current signal is amplified by operational amplifier chip U1, and the amplified current signal is fed back to the ADC0 pin of the main control chip for acquisition. During the charging process of the selected fuel injector, the main control chip continuously acquires data from the ADC1 and ADC2 pins. The acquired data is stored in the main control chip, which then performs type and status identification.

[0081] Step 2.4 Fuel Injector Identification: The main control chip uses waveform curve data to make the following judgments to identify the fuel injector type and status, wherein the test time is T0-T1, T1-T20, and the voltage is 0V-3.3V;

[0082] When the selected channel is not connected to the fuel injector: the charge in the piezoelectric fuel injector is discharged from the test time T0 to T1; the fuel injector is charged from the start of the test time T1. Since there is no current during the charging process, the voltage waveform has only one high pulse and maintains the highest voltage waveform from the test time T1 to T20. The main control chip determines that the fuel injector is not connected by calculating and comparing the charging waveform curve data, referring to the waveform diagram and analyzing the data values.

[0083] When a normal piezoelectric injector is connected to the selected channel: the charge inside the piezoelectric injector is discharged during the test time T0 to T1; the injector begins to be charged at the start of the test time T1. As the current changes continuously from large to small during the charging process, there is a clear charging curve waveform during the test time T1-T20. The charging time is normal. The main control chip determines that the injector is a normal piezoelectric ceramic injector by calculating and comparing the waveform curve data, referring to the waveform diagram, and analyzing the data values.

[0084] When the selected channel is connected to an abnormal piezoelectric ceramic injector: the charge inside the piezoelectric ceramic injector is discharged during the test time T0 to T1; the piezoelectric ceramic injector begins to charge at the start of the test time T1. Because the current changes continuously from large to small during the charging process, there is an obvious charging curve waveform during the test time T1-T20, but the charging time is short. The main control chip determines the existence of a charging abnormality in the piezoelectric ceramic injector by calculating and comparing the waveform curve data, referring to the waveform diagram, and analyzing the data values.

[0085] When the selected channel is connected to the electromagnetic injector: the charge in the piezoelectric injector is discharged from the test time T0 to T1; the injector starts charging at the start of the test time T1. Because a large current is maintained during the charging process, the waveform remains low during the test time T1-T20. The main control chip determines the electromagnetic injector by calculating and comparing the waveform curve data, referring to the waveform diagram and analyzing the data values.

[0086] As a further improvement, step (3) of the detection method includes the following steps:

[0087] Step 3.1 Measurement and Reset to Enter the Internal Resistance of the Electromagnetic Injector: Close all injector connection circuits, and the main control chip drives the injector working current sampling circuit 8 to select one group of injector connection circuits to enter the internal resistance test of the electromagnetic injector.

[0088] Step 3.2 Injector Internal Resistance Measurement: The injector internal resistance measurement driver is activated. The main control chip's IJ OPWM pin outputs a low / high level to control the selected injector channel's conduction, turning on the source and drain of MOSFET Q. The TIM0 CH0 pin outputs a high level to control the source and drain of MOSFET Q1. The TIM0 CH0 ON pin outputs a low level to control the source and drain of MOSFET Q2. The injector test power supply current charges the selected channel injector through resistor R5. Resistors R5, R8, R10, and R12 form the injector charging signal circuit. The charging voltage signal is divided and fed back to the main control chip's ADC2 pin through resistor R9. The ADC2 pin acquires the charging process electrical signal (0-3.3V). The injector operating power supply voltage signal is divided by resistors R14, R15, and R16 and then... R17 feeds back to the ADC1 pin of the main control chip for acquisition. The current generated during the operation of the fuel injector is collected by resistors R21 and R22. A current signal is generated across resistors R21 and R22, which is amplified by operational amplifier chip U1. The amplified current signal is then fed back to the ADC0 pin of the main control chip. During the fuel injector resistance test, the main control chip continuously samples the ADC1 and ADC0 pins. The sampled data is stored in the main control chip. After sampling is completed, the main control chip calculates the internal resistance of the fuel injector.

[0089] Step 3.3 Perform fuel injector resistance measurement on all control injector channels: After the selected electromagnetic injector has been tested, the main control chip detects that there is another electromagnetic injector to be tested, and performs the test on another electromagnetic injector. Repeat steps 3.1-3.3 until all connected electromagnetic injectors have been tested and then exit; if no test is required, exit the test directly.

[0090] This invention utilizes a multi-channel fuel injector type and status identification and detection system to determine whether multiple fuel injectors are damaged, not charging, or exhibiting normal charging and charge retention phenomena. It can identify fuel injectors in an disconnected state, and diagnose coil-type or piezoelectric fuel injectors after proper connection. It also detects fuel injector malfunctions and short circuits. This allows for the detection of different types of automotive fuel injectors, improving compatibility, increasing testing efficiency, and reducing testing costs. Furthermore, it enables internal resistance testing of detected electromagnetic fuel injectors, allowing for individual testing of each electromagnetic injector, ensuring consistency, and improving resistance detection accuracy. This multi-channel fuel injector type and status identification and detection system can perform fuel injector identification and internal resistance testing for electromagnetic injectors, reducing the need for injector replacement for testing, ensuring detection accuracy, and improving maintenance efficiency.

[0091] The main control module is used for controlling and identifying the type of fuel injector, controlling and testing the internal resistance of the identified electromagnetic fuel injector, and providing feedback on the test results. A multi-channel fuel injector identification module, consisting of a multi-type fuel injector identification and detection circuit, a fuel injector operating current sampling circuit, and a fuel injector test channel selection circuit, is used to detect fuel injectors. The multi-type fuel injector identification and detection circuit identifies the type of fuel injector, determining whether it is a coil fuel injector or a piezoelectric ceramic fuel injector. The fuel injector operating current sampling circuit tests the resistance of the detected electromagnetic fuel injector, thus detecting the resistance value. The fuel injector test channel selection circuit is used for connection and conduction, thereby cooperating with the multi-type fuel injector identification and detection circuit and the fuel injector working current sampling circuit to perform fuel injector type identification or resistance testing. The multi-type fuel injector identification and detection circuit, composed of a fuel injector charge / discharge control circuit, a fuel injector charging signal sampling circuit, and a fuel injector voltage acquisition circuit, is used to control the testing action. The fuel injector charge / discharge control circuit is used for charge / discharge control; the fuel injector charging signal acquisition circuit is used for signal acquisition during fuel injector charging; and the fuel injector working voltage sampling circuit is used for acquiring voltage changes during fuel injector operation.

[0092] This invention is not limited to the above-described embodiments. Other multi-channel fuel injector type and status identification detection systems and methods obtained by using the same or similar structures, devices, processes or methods as the above-described embodiments of this invention are all within the protection scope of this invention.

Claims

1. A multi-pass, nozzle type, condition identification detection system, characterized by: The multi-channel fuel nozzle type and state identification detection system comprises a main control module, a multi-channel fuel nozzle identification module and a man-machine interactive operation module, the multi-channel fuel nozzle identification module and the man-machine interactive operation module are electrically connected with the main control module; the multi-channel fuel nozzle identification module is connected with a fuel nozzle interface circuit; The main control module is used for controlling the multi-channel fuel nozzle identification module to act, testing and data collecting the type identification, working current, working voltage and charging signal of the fuel nozzle, and calculating and analyzing the collected data to obtain the type, state and resistance value of the fuel nozzle; The multi-channel fuel nozzle identification module comprises a multi-type fuel nozzle identification detection circuit, a fuel nozzle working current sampling circuit and a fuel nozzle test channel selection circuit; the multi-type fuel nozzle identification detection circuit, the fuel nozzle working current sampling circuit and the fuel nozzle test channel selection circuit are connected with each other; the multi-type fuel nozzle identification detection circuit and the fuel nozzle working current sampling circuit are electrically connected with the fuel nozzle interface circuit; the multi-type fuel nozzle identification detection circuit is used for the identification and detection of the type of the fuel nozzle, so as to determine whether the measured fuel nozzle is a coil type fuel nozzle or a piezoelectric ceramic fuel nozzle; the fuel nozzle working current sampling circuit is used for testing the resistance of the electromagnetic fuel nozzle after detection, so as to detect the resistance value; the fuel nozzle test channel selection circuit is used for the connection of the conduction, so as to cooperate with the multi-type fuel nozzle identification detection circuit and the fuel nozzle working current sampling circuit to perform the fuel nozzle type and state identification or resistance test action; The main control module comprises a main control chip; the multi-type fuel nozzle identification detection circuit comprises a fuel nozzle charging and discharging control circuit, a fuel nozzle charging signal sampling circuit and a fuel nozzle voltage acquisition circuit; the fuel nozzle charging and discharging control circuit is used for the charging and discharging control; the fuel nozzle charging signal acquisition circuit is used for the signal acquisition during the charging of the fuel nozzle; the fuel nozzle voltage acquisition circuit is used for the acquisition of the voltage change required for the identification and resistance test data calculation of the fuel nozzle during working.

2. The multi-pass, nozzle type, condition identification detection system of claim 1, wherein: The main control module is provided with a TIMO CHO pin end and a TIMO CHO NO pin end, the fuel nozzle charging and discharging control circuit is provided with a connection end one, a connection end two and a fuel nozzle working power supply connection end INJ Power, the connection end one is connected with the TIMO CHO pin end, and the connection end two is connected with the TIMO CHO NO pin end; the fuel nozzle charging and discharging control circuit comprises a MOS tube Q1, a MOS tube Q2 and a rectifier diode D2, the drain electrode of the MOS tube Q1 is connected with the fuel nozzle working power supply connection end INJ Power, the gate electrode of the MOS tube Q2 is connected with the connection end one, and a resistor R4 is arranged between the gate electrode of the MOS tube Q2 and the connection end one; the source electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2; a resistor R7 is arranged between the source electrode of the MOS tube Q1 and the drain electrode of the MOS tube Q2; the gate electrode of the MOS tube Q2 is connected with the connection end two; the source electrode of the MOS tube Q2 is connected with one end of the rectifier diode D2, and the other end of the rectifier diode D2 is connected with the connection end two. A resistor R6 is arranged in parallel between the gate electrode and the source electrode of the MOS tube Q1, and a resistor R11 is arranged in parallel between the gate electrode and the source electrode of the MOS tube Q2.

3. The multi-pass, nozzle type, condition identification detection system of claim 2, wherein: The main control chip is provided with an ADC2 pin end and an ADC1 pin end; the fuel nozzle charging signal sampling circuit comprises a plurality of resistors and a capacitor C6, the plurality of resistors comprise resistors R5, R8, R10 and R12 which are connected in series, one end of the resistor R5 is connected with the fuel nozzle working power supply connection end INJ Power; a connection end three is arranged between the resistor R5 and the resistor R8, the connection end three is connected with the resistor R6, and the connection end three is connected with a fuel nozzle test common end INJCOM; one end of the resistor R12 is connected with the source electrode of the MOS tube and one end of the capacitor C6 respectively, a connection end four is arranged between the resistor R8 and the resistor R10, the connection end four and the other end of the capacitor C6 are both connected with the ADC2 pin end, and a resistor R9 is arranged between the connection end four and the ADC2 pin end; The fuel nozzle working voltage sampling circuit comprises resistors R14, R24 and R27 which are connected in series, the other end of the resistor R14 is connected with one end of the resistor R5; a connection end five is arranged between the resistor R14 and the resistor R24, the connection end five is connected with the ADC1 pin end; a resistor R17 is arranged between the connection end five and the ADC1 pin end; a connection end six is arranged between the resistor R17 and the ADC1 pin end; and the connection end six is connected with a capacitor C8.

4. The multi-pass, nozzle type, condition identification detection system of claim 3, wherein: The main control chip is provided with an ADC0 pin end; the fuel nozzle working current sampling circuit comprises an operational amplifier chip U1, a resistor R25 and a resistor R15; the operational amplifier chip U1 is provided with an NC pin end, an OUT pin end, a V+ pin end, an NC pin end, a V- pin end, a +IN pin end and an -IN pin end; the OUT pin end is connected with the ADC0 pin end, the +IN pin end is connected with one end of the resistor R25, the -IN pin end is connected with one end of the resistor R15, the other end of the resistor R15 is connected with a resistor R21, the other end of the resistor R21 is connected with the other end of the resistor R25; one end of the resistor R15 is also connected with the OUT pin end; the V+ pin end is connected with a capacitor C7; a resistor R26 is arranged between the ADC0 pin end and the OUT pin end, a connecting end seven is arranged between the resistor R26 and the ADC0 pin end, and the connecting end seven is connected with a capacitor C9; a connecting end eight is arranged between the capacitor C7 and the V+ pin end, and the connecting end eight is connected with an inductor FB2; a resistor R16 is arranged between one end of the resistor R15 and the OUT pin end; one or more resistors R22 are connected in parallel between the resistor R25 and the resistor R15; a connecting end nine is arranged between the resistor R25 and the resistor R21, and the connecting end nine is connected with a current sampling connecting end 0 COM, which is connected with the fuel nozzle test channel selection circuit; a voltage stabilizing diode DZ1 is further arranged between the +IN pin end and the -IN pin end.

5. The multi-pass, condition identification detection system of claim 4, wherein The main control chip is further provided with a plurality of driving pin ends IJ OPWM; the fuel nozzle test channel selection circuit comprises a plurality of groups of fuel nozzle connecting circuits, and the plurality of groups of fuel nozzle connecting circuits are connected in parallel; each of the plurality of groups of fuel nozzle connecting circuits comprises a conducting MOS tube Q, a resistor R13 and a resistor R19, the source of the conducting MOS tube Q is connected with the current sampling connecting end 0 COM, and the drain of the conducting MOS tube Q is connected with a fuel nozzle test common end INJ COM; a voltage stabilizing diode D3 is arranged between the drain of the conducting MOS tube Q and the fuel nozzle test common end INJ COM, a connecting end ten is arranged between the voltage stabilizing diode D3 and the drain of the conducting MOS tube Q, and the connecting end ten is connected with the fuel nozzle interface circuit; one end of the resistor R13 is provided with a P+ connecting end, the P+ connecting end is used for connecting a 12V power supply; the other end of the resistor R13 is connected with the gate of the conducting MOS tube Q and the driving pin end IJ OPWM; a connecting end eleven is arranged between the other end of the resistor R13 and the gate of the conducting MOS tube Q; the connecting end eleven is connected with one end of the resistor R19; The fuel injection nozzle connecting circuit is further provided with a triode Q4, the base of the triode Q4 is connected with the driving pin end IJOPWM, the collector of the triode Q4 is connected with the resistor R13, and the emitter of the triode Q4 is connected with the other end of the resistor R19; the other end of the resistor R19 is further provided with a resistor R20, the resistor R20 is connected with the base of the triode Q4; and the resistor R18 is arranged between the triode Q4 and the driving pin end IJOPWM.

6. The multi-pass, condition identification detection system of claim 5, wherein: The fuel injection nozzle interface circuit comprises a plurality of IJ Contr pin ends and INJECT pin ends, the IJ Contr pin ends are respectively connected with the connection ends ten, and the IJ Contr pin ends are respectively connected with one wire end of the fuel injection nozzle, so that the electrical connection conduction control of the plurality of fuel injection nozzles is realized; the INJECT pin end is connected with one end of the resistor R6, and the INJECT pin end is connected with the other wire end of the fuel injection nozzle; The main control chip is provided with a USART2 TX pin end and a USART2 RX pin end; the man-machine interaction operation module comprises a display chip P1 and an inductor coil FB1, the display chip P1 is provided with a TX pin end and a RX pin end, the TX pin end is connected with the USART2 TX pin end, and the RX pin end is connected with the USART2 RX pin end; resistors are arranged between the TX pin end and the USART2 TX pin end and between the RX pin end and the USART2 RX pin end; one end of the inductor coil FB1 is connected with the display chip P1, and the other end of the inductor coil FB1 is connected with the P+ connection end.

7. The multi-channel nozzle type, condition identification detection system of claim 6, wherein: The main control chip is further provided with a running indicator lamp pin end, a system pressure sensor pin end and an abnormal error driving output pin end, a VBAT pin end and a plurality of power supply pin ends; the running indicator lamp pin end is connected with a running indicator lamp module; the system pressure sensor pin end is connected with a pressure sensor module; the plurality of power supply pin ends each comprise a VDD pin end and a VSS pin end, and a capacitor C is arranged between the VDD pin end and the VSS pin end; The VDD pin end, the VBAT pin end and the other end of the inductor coil FB2 are all connected with a power supply connection end S, the power supply connection end S is used for providing a 3V3 power supply; the VBAT pin end is further provided with a capacitor C1, the capacitor C1, the VSS pin end, the other end of the resistor R12, the other end of the resistor R27, the capacitor C8, the capacitor C9, the V- pin end and the connection end of the emitter of the triode Q4 and the resistor R19 are all connected with a GND connection end, and the GND connection end is used for connecting a negative electrode of a power supply.

8. A detection method of a detection system of a type, state recognition of a multi-channel fuel nozzle, according to any one of claims 6 to 7, characterized in that, It comprises the following steps: (1) The fuel nozzle is connected and powered on: the fuel nozzles to be tested are connected to the fuel nozzle interface circuit, and the socket plug connection structure is used for electrical connection, so that one wire end of the fuel nozzle is connected with the IJ Contr pin end, and the other wire end of the fuel nozzle is connected with the IN JECT pin end; the multi-channel fuel nozzle type and state identification detection system is started to test the power-on; (2) Fuel nozzle type identification: after starting, the main control chip controls the multi-type fuel nozzle identification detection circuit to open each fuel nozzle one by one for charging and discharging actions, and the voltage change data obtained by the charging and discharging actions are fed back to the main control chip for processing; the main control chip feeds back the test results to the man-machine interaction operation module according to the obtained voltage change process data, and judges the type and state of the tested fuel nozzle, judges whether the fuel nozzle is a piezoelectric fuel nozzle or an electromagnetic fuel nozzle, and judges whether the test channel is in the fuel nozzle unconnected state, the fuel nozzle normal, the fuel nozzle abnormal, or the short circuit; when the tested voltage change maintains a low voltage and the voltage has no change within the test time period, the main control chip judges that the fuel nozzle is an electromagnetic fuel nozzle, and then proceeds to the next test step; when the tested fuel nozzle is a piezoelectric ceramic fuel nozzle, a fuel nozzle unconnected state, a fuel nozzle abnormality, or a short circuit, the fuel nozzle in an abnormal state is intuitively fed back to the tester through the man-machine interaction operation module, and the tester further confirms; (3) The internal resistance test of the electromagnetic fuel nozzle: the main control chip tests the electromagnetic fuel nozzles classified by the fuel nozzle type identification one by one, closes the channel of the non-electromagnetic fuel nozzle, and then drives the electromagnetic fuel nozzle for internal resistance test action; the main control chip drives the fuel nozzle working current sampling circuit to act, drives the fuel nozzle connection circuit connected with the electromagnetic fuel nozzle, and feeds the data after driving to the main control chip for data processing; after the processing is completed, the data is displayed through the man-machine interaction operation module, so that the tester knows the test data and understands the state of the electromagnetic fuel nozzle; (4) Test completion: the main control chip stores the test data, then performs data analysis and displays it in the display chip P1, and the tester confirms and classifies the fuel nozzles according to the display information, connects the next group of fuel nozzles to be tested, and completes the whole identification and inspection process.

9. The detection method according to claim 8, characterized in that, The step (2) further comprises the following steps: Step 2.1: when the main control chip tests, the fuel nozzle test channel selection circuit selects the fuel nozzle test channel to be identified, and the fuel nozzle charging and discharging control circuit controls the fuel nozzle to perform charging and discharging actions; Step 2.2 discharging process, the drive pin end IJOPWM output low level control the selected nozzle channel MOS tube Q source and drain conduction, drive TIMO CHO pin end output low level control MOS tube Q1 source and drain off, drive TIM0 CH0 ON pin end output high level control MOS tube Q2 source and drain conduction, the selected nozzle channel MOS tube Q and MOS tube Q2 form current loop for consumption of the stored amount of electricity in the nozzle; Step 2.3 after the completion of the discharge, charging, after the completion of the discharge, enter the charging process, the main control chip drive pin end IJOPWM output low level control the selected nozzle channel MOS tube Q source and drain conduction, drive TIMO CHO pin end, TIM0 CH0 ON pin end output low level control MOS tube Q1, MOS tube Q2 source and drain off, nozzle test power supply through the resistance R5 to the selected nozzle channel charging, resistance R5, resistance R8, resistance R10 and resistance R12 constitute the nozzle charging signal sampling circuit charging signal acquisition, charging voltage signal after voltage division through resistance R9 feedback to the main control chip ADC2 pin end, ADC2 pin end will collect the charging process electric signal 0-3.3V feedback to the main control chip, the selected nozzle working power signal through resistance R14, resistance R15, resistance R16 voltage division through resistance R17 feedback to the main control chip ADC1 pin end for collection; The current generated in the selected nozzle working process through the resistance R21, resistance R22 between the two ends of the current signal, current signal through the op-amp chip U1 amplification, the amplified current signal feedback to the main control chip ADC0 pin end for collection; The selected nozzle in the charging process, the main control chip continuously collects ADC1 pin end, ADC2 pin end, the collected data is stored in the main control chip, the main control chip type, state identification; Step 2.4 nozzle identification: the main control chip uses waveform curve data to make the following judgments, so as to identify the nozzle type and state, wherein the test time is T0-T1, T1-T20, and the voltage is 0V-3.3V; When the selected channel is not connected to the nozzle: test time T0 to T1 piezoelectric nozzle empty; Test time T1 start charging the nozzle, because there is no current in the charging process, the voltage waveform has only one high pulse and always maintains the highest voltage waveform in the test time T1-T20, the main control chip calculates and compares the analysis data value by the charging waveform curve data, analyzes the reference waveform diagram, and judges that the nozzle is not connected. When the channel is connected to a normal piezoelectric fuel injector: the piezoelectric fuel injector is discharged at test time T0-T1; the piezoelectric fuel injector is charged at test time T1; the current changes from large to small during the charging process; there is a clear charging curve waveform at test time T1-T20; the charging time is normal; the main control chip calculates and compares the waveform curve data, analyzes the reference waveform diagram and data values, and determines that the piezoelectric fuel injector is a normal piezoelectric ceramic fuel injector; When the channel is connected to an abnormal piezoelectric ceramic fuel injector: the piezoelectric ceramic fuel injector is discharged at test time T0-T1; the piezoelectric ceramic fuel injector is charged at test time T1; the current changes from large to small during the charging process; there is a clear charging curve waveform at test time T1-T20, but the charging time is short; the main control chip calculates and compares the waveform curve data, analyzes the reference waveform diagram and data values, and determines that the piezoelectric ceramic fuel injector has charging abnormalities; When the channel is connected to an electromagnetic fuel injector: the piezoelectric fuel injector is discharged at test time T0-T1; the piezoelectric fuel injector is charged at test time T1; the current remains large during the charging process; there is no charging waveform at test time T1-T20, and the current remains low; the main control chip calculates and compares the waveform curve data, analyzes the reference waveform diagram and data values, and determines that the electromagnetic fuel injector.

10. The detection method according to claim 8, characterized in that, The step (3) comprises the following steps, This step is the step of internal resistance test: Step 3.1 measures the internal resistance of the reset into the electromagnetic fuel injector: all fuel injector connection circuits are closed; the main control chip drives the fuel injector working current sampling circuit to select one set of fuel injector connection circuits; the internal resistance test of the electromagnetic fuel injector is entered; Step 3.2 Fuel injector internal resistance measurement: fuel injector internal resistance measurement opens the drive, the main control chip drives IJ OPWM pin end output low high level control to select the fuel injector channel on MOS tube Q source and drain conduction, drive TIM0 CH0 pin end output high level control MOS tube Q1 source and drain conduction, TIM0 CH0 ON pin end output low level control MOS tube Q2 source and drain off, fuel injector test power current through resistance R5 to select the channel fuel injector charging, resistance R5, resistance R8, resistance R10, resistance R12 constitute fuel injector charging signal circuit, charging voltage signal after voltage division through resistance R9 feedback to the main control chip ADC2 pin end, ADC2 pin end collection charging process electric signal 0-3.3V, fuel injector working power voltage signal through resistance R14, resistance R15, resistance R16 voltage division through resistance R17 feedback to the main control chip ADC1 pin end collection, current resistance R21 and resistance R22 generated in the process of fuel injector, current signal is generated in the resistance R21 and resistance R22 both ends, through the op-amp chip U1 amplification signal, the amplified current signal feedback to the main control chip ADC0 pin end; In the process of fuel injector resistance test, the main control chip continuously samples ADC1 pin end, ADC0 pin end, the sampling data is saved in the main control chip, the sampling end main control chip calculates the fuel injector internal resistance; Step 3.3 all control fuel injector channel for fuel injector resistance measurement: when the selected electromagnetic fuel injector test is completed, the main control chip detects that there is an electromagnetic fuel to be detected, another electromagnetic fuel injector is tested, steps 3.1-3.3 are repeated, until all connected electromagnetic fuel injector detection is completed and exit; If no test is needed, exit the test directly.

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