Multi-channel oil nozzle type and state identification detection system and detection method

Abstract

The invention discloses a multi-channel oil nozzle type and state recognition and detection system which comprises a main control module, a multi-channel oil nozzle recognition module, a man-machine interaction operation module and an oil nozzle interface circuit. The multi-channel oil nozzle identification module comprises a multi-type oil nozzle identification detection circuit, an oil nozzle working current sampling circuit and an oil nozzle test channel selection circuit. The invention further discloses a detection method. According to the invention, multi-state identification (normal state, bad state and unconnected state) actions of the multi-channel piezoelectric type and electromagnetic type oil nozzles and internal resistance detection of the electromagnetic type oil nozzles are realized, the steps that the oil nozzles can be detected only by replacing devices are reduced, the detection precision is ensured, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fuel injector detection systems, and in particular to a multi-channel fuel injector type and state recognition detection system and a detection method. Background Art

[0002] The fuel injectors for fuel-powered passenger cars in the existing market mainly include: 1.12V-16V injectors; 2.70-180V injectors according to the driving voltage type. The physical classification of automobile fuel injectors is based on the material type: 1. Coil electromagnetic fuel injectors; 2. Piezoelectric ceramic fuel injectors. The electromagnetic fuel injectors used in existing automobiles are driven by a voltage of 1.12V-24V; the piezoelectric fuel injectors used are driven by a voltage of 70-180V. When inspecting automobile fuel injectors, the existing method is to use a fuel injector drive device for detection, thereby improving the inspection efficiency. The traditional detection device includes a low-voltage fuel injector device, a high-voltage fuel injector device, a coil electromagnetic fuel injector device and a piezoelectric ceramic fuel injector device. When different types of automobile fuel injectors are detected, the corresponding driven detection device is connected, and it is impossible to achieve a device compatible with multiple types of fuel injectors. The compatibility is poor, which affects the efficiency of the detection test and increases the cost of the detection test. When the existing fuel injector drive device detects an electromagnetic fuel injector, it is necessary to replace the detection device to detect the internal resistance of the electromagnetic fuel injector. It is impossible to realize the fuel injector type identification and the electromagnetic fuel injector internal resistance detection action in the same detection system. While increasing the detection steps, it affects the detection accuracy and the maintenance efficiency. Summary of the invention

[0003] This invention is aimed at the current technical deficiencies and provides a multi-channel injector type and state identification detection system and detection method, aiming to solve the technical problem that the injectors in the prior art can only perform single function detection and cannot achieve multi-functional detection such as rapid category identification and resistance internal resistance detection.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0005] A multi-channel fuel injector type and state identification detection system comprises a main control module, a multi-channel fuel injector identification module and a human-computer interaction operation module, wherein the multi-channel fuel injector identification module and the human-computer 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, test and collect data on the type identification, working current, working voltage and charging signal of the fuel injector, and calculate and analyze the collected data to obtain the fuel injector type (piezoelectric fuel injector, electromagnetic fuel injector), state (unconnected, normal fuel injector, abnormal fuel injector) and resistance value;

[0007] The multi-channel injector identification module includes a multi-type injector identification detection circuit, an injector working current sampling circuit and an injector test channel selection circuit; the multi-type injector identification detection circuit, the injector working current sampling circuit and the injector test channel selection circuit are connected to each other; the multi-type injector identification detection circuit and the injector working current sampling circuit are electrically connected to the injector interface circuit; the multi-type injector identification detection circuit is used for the identification and detection of the type of the injector, so as to determine whether the measured injector is a coil-type injector or a piezoelectric ceramic injector; the injector working current sampling circuit is used for testing the resistance of the electromagnetic injector after detection, so as to detect the resistance value; the injector test channel selection circuit is used for the connection and conduction, so as to cooperate with the multi-type injector identification detection circuit and the injector working current sampling circuit to perform injector type, state 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 charge and discharge control circuit, a fuel injector charging signal sampling circuit and a fuel injector voltage acquisition circuit; the fuel injector charge and discharge control circuit is used for charge and discharge control; the fuel injector charging signal acquisition circuit is used for signal acquisition when the fuel injector is charging; the fuel injector voltage acquisition circuit is used for identification of the fuel injector when it is working and for collecting the voltage changes required for calculating the resistance test data;

[0009] The main control module is provided with a TIMO CHO pin end and a TIMO CHO NO pin end, and the injector charge and discharge control circuit is provided with a connection end 1, a connection end 2 and an injector working power connection end INJ Power, wherein the connection end 1 is connected to the TIMO CHO pin end, and the connection end 2 is connected to the TIMO CHO NO pin end; the injector charge and discharge control circuit comprises a MOS tube Q1, a MOS tube Q2 and a rectifier diode D2, wherein the drain of the MOS tube Q1 is connected to the injector working power connection end INJ Power, the gate of the MOS tube Q2 is connected to the connection end 1, and a resistor R4 is provided between the gate of the MOS tube Q2 and the connection end 1; the source of the MOS tube Q1 is connected to the drain of the MOS tube Q2; a resistor R7 is provided between the source of the MOS tube Q1 and the drain of the MOS tube Q2; the gate of the MOS tube Q2 is connected to the connection end 2; the source of the MOS tube 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 end 2;

[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 an ADC2 pin end and an ADC1 pin end; the injector charging signal sampling circuit includes a plurality of resistors and a capacitor C6, the plurality of resistors include a resistor R5, a resistor R8, a resistor R10 and a resistor R12 connected in series in sequence, one end of the resistor R5 is connected to the injector working power connection terminal INJ Power; a connection terminal three is provided between the resistor R5 and the resistor R8, the connection terminal three is connected to the resistor R6, and the connection terminal three is connected to the injector test common terminal INJ COM; one end of the resistor R12 is respectively connected to the source of the MOS tube and one end of the capacitor C6, a connection terminal four is provided between the resistor R8 and the resistor R10, the other ends of the connection terminal four and the capacitor C6 are both connected to the ADC2 pin end, and a resistor R9 is provided between the connection terminal four and the ADC2 pin end;

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

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

[0014] A resistor R26 is provided between the ADC0 pin end and the OUT pin end, a connection terminal seven is provided between the resistor R26 and the ADC0 pin end, 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 end, 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 end; one or more resistors R22 are connected in parallel between the resistor R25 and the resistor R15; a connection terminal nine is provided between the resistor R25 and the resistor R21, and a current sampling connection terminal OCOM is connected to the current sampling connection terminal OCOM, and the current sampling connection terminal OCOM is connected to the injector test channel selection circuit; a voltage stabilizing diode DZ1 is also connected between the +IN pin end and the -IN pin end.

[0015] As a further improvement, the main control chip is also provided with a plurality of drive pin terminals IJ OPWM; the injector test channel selection circuit includes a plurality of groups of injector connection circuits, and the plurality of groups of the injector connection circuits are connected and conducted in a parallel connection manner; the plurality of groups of the injector connection circuits all include a conduction MOS tube Q, a resistor R13 and a resistor R19, the source of the conduction MOS tube Q is connected to the current sampling connection terminal OCOM, and the drain of the conduction MOS tube Q is all connected to the injector test common terminal INJ COM; a voltage stabilizing diode D3 is provided between the drain of the conduction MOS tube Q and the injector test common terminal INJ COM, and a connection terminal ten is provided between the voltage stabilizing diode D3 and the drain of the conduction MOS tube Q, and the connection terminal ten is connected to the injector interface circuit; one end of the resistor R13 is provided with a P+ connection terminal, and the P+ connection terminal is used to connect a 12V power supply; the other end of the resistor R13 is connected to the gate of the conduction MOS tube Q and the drive pin terminal IJ OPWM connection; a connection terminal 11 is provided between the other end of the resistor R13 and the gate of the conductive MOS tube Q; the connection terminal 11 is connected to one end of the resistor R19;

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

[0017] As a further improvement, the injector interface circuit includes a plurality of IJ Contr pin ends and IN JECT pin ends, the IJ Contr pin ends are respectively connected to the connection end ten, and the IJ Contr pin ends are respectively connected to one of the wiring terminals of the injector, so as to realize the function of electrical connection and conduction control of the plurality of injectors; the IN JECT pin end is connected to one end of the resistor R6, and the N JECT pin end is connected to the other wiring terminal of the injector;

[0018] The main control chip is provided with a USART2 TX pin end and a USART2 RX pin end; the human-computer interaction operation module includes a display chip P1 and an inductor FB1, the display chip P1 is provided with a TX pin end and an RX pin end, the TX pin end is connected to the USART2 TX pin end, and the RX pin end is connected to the USART2 RX pin end; resistors are provided 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 FB1 is connected to the display chip P1, and the other end of the inductor FB1 is connected to the P+ connection end.

[0019] As a further improvement, the main control chip is also provided with an operation indicator pin end, a system pressure sensor pin end, an abnormal error drive output pin end, a VBAT pin end and multiple groups of power supply pin ends; the operation indicator pin end is connected with an operation indicator module; the system pressure sensor pin end is connected with a pressure sensor module connection; the multiple groups of power supply pin ends all include a VDD pin end and a VSS pin end, and a capacitor C is connected between the VDD pin end and the VSS pin end;

[0020] The VDD pin end, the VBAT pin end, and the other end of the inductor FB2 are all connected with a power connection end S, and the power connection end S is used to provide a 3V3 power supply; the VBAT pin end is also provided with a capacitor C1, and 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, the emitter of the transistor Q4 and the connection end of the resistor R19 are all connected with a GND connection end, and the GND connection end is used to connect the negative electrode of the power supply.

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

[0022] (1) Injector connection and power-on: The injectors to be tested are respectively connected to the injector interface circuit, and are electrically connected using a socket connection structure, so that one terminal of the injector is connected to the IJ CONTR pin, and the other terminal of the injector is connected to the IN JECT pin; the multi-channel injector type and state identification detection system is started to perform power-on test;

[0023] (2) Injector type identification: After startup, the control chip controls the multi-type injector identification detection circuit to open each injector one by one to perform charging and discharging actions, and feeds back the voltage change data obtained during the charging and discharging actions to the control chip for processing. The control chip feeds back the test results to the human-computer interaction operation module based on the obtained voltage change process data, and determines the type and state of the tested injector, determines whether the injector is a piezoelectric injector or an electromagnetic injector, and determines whether the test channel is in the injector disconnected state, the injector is normal, the injector is abnormal, or short-circuited; when the tested voltage change maintains a low voltage and the voltage does not change within the test time period, the 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, the injector is disconnected, the injector is abnormal, or short-circuited, the injector in the abnormal state is intuitively fed back to the tester through the human-computer interaction module, and the tester further confirms;

[0024] (3) Internal resistance test of electromagnetic fuel injectors: the control chip tests the electromagnetic fuel injectors classified by the fuel injector type identification one by one, closes the channels of non-electromagnetic fuel injectors, and then drives the electromagnetic fuel injectors to perform internal resistance test; the 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 control chip for data processing. After the processing is completed, the data is displayed through the human-computer interaction operation module, so that the tester knows the test data and understands the status of the electromagnetic fuel injector;

[0025] (4) Test completed: The 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 injectors based on the displayed information, and then conduct the test connection of the next group of injectors to be tested. The entire identification and inspection process is completed.

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

[0027] (2.1) When the control chip is tested, the injector test channel selection circuit is controlled to select the injector test channel that needs to be identified, and the injector charge and discharge control circuit controls the injector to perform charge and discharge actions;

[0028] (2.2) During the discharge process, the driving pin IJ OPWM outputs a low level to control the source and drain of the selected injector channel to be turned on, the driving pin TIMO CHO outputs a low level to control the source and drain of the MOS tube Q1 to be turned off, and the driving pin TIMO CH0 ON outputs a high level to control the source and drain of the MOS tube Q2 to be turned on. The selected injector channel's turned-on MOS tube Q and MOS tube Q2 form a current loop to consume the electricity stored in the injector;

[0029] (2.3) After the discharge is completed, charging is performed. After the discharge is completed, the charging process begins. The control chip drives the pin end IJOPWM to output a low level to control the source and drain of the conduction MOS tube Q of the selected injector channel to be turned on, and drives the TIMO CHO pin end and the TIM0 CH0 ON pin end to output a low level to control the MOS tube Q1. The source and drain of the MOS tube Q2 are turned off. The injector test power supply charges the selected injector channel through the resistor R5. The injector charging signal sampling circuit composed of the resistors R5, R8, R10 and R12 collects the charging signal. The charging voltage signal is divided and fed back to the ADC2 pin end of the control chip through the resistor R9. The ADC2 pin end feeds back the collected charging process electrical signal (0-3.3V) to the control chip. The working power supply signal of the selected injector is divided by the resistors R14, R15 and R16 and fed back to the ADC1 pin end of the control chip through the resistor R17 for collection.

[0030] The current generated during the operation of the selected fuel injector passes through the two ends of the resistor R21 and the resistor R22 to generate a current signal, which is amplified by the operational amplifier chip U1, and the amplified current signal is fed back to the ADC0 pin of the control chip for collection; during the charging process of the selected fuel injector, the control chip continuously collects data from the ADC1 pin and the ADC2 pin, and the collected data is stored in the main control chip, which performs type and status recognition;

[0031] (2.4) Injector identification: The control chip uses waveform curve data to make the following judgments to identify the type and status of the injector, where 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 injector: the power in the piezoelectric injector is discharged from the test time T0 to T1; the injector starts to be charged from 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 during the test time T1-T20. The control chip determines that the injector is not connected by calculating and comparing the charging waveform curve data, referring to the waveform diagram, and analyzing the data value;

[0033] When the channel is first connected to a normal piezoelectric fuel injector: the power in the piezoelectric fuel injector is emptied from the test time T0 to T1; the fuel injector starts to be charged from the test time T1. Since the current changes from large to small during the charging process, there is an obvious charging curve waveform during the test time T1-T20, and the charging time is normal. The control chip determines that the fuel injector is a normal piezoelectric ceramic fuel injector by calculating and comparing the waveform curve data, referring to the waveform diagram, and analyzing the data value;

[0034] When the channel is selected to connect to the abnormal piezoelectric ceramic fuel injector: the power in the piezoelectric ceramic fuel injector is discharged from the test time T0 to T1; the piezoelectric ceramic fuel injector starts to charge from the test time T1. Since the current changes from large to small during the charging process, there is an obvious charging curve waveform in the test time T1-T20, but the charging time is short. The control chip calculates and compares the waveform curve data, refers to the waveform diagram, analyzes the data value, and determines that the piezoelectric ceramic fuel injector has charging abnormality;

[0035] When the selected channel is connected to the electromagnetic fuel injector: the power in the piezoelectric fuel injector is discharged from the test time T0 to T1; the fuel injector starts to charge from the test time T1. Since a large current is maintained during the charging process, the non-charging waveform is kept at a low level during the test time T1-T20. The control chip determines the electromagnetic fuel injector by calculating and comparing the waveform curve data with the reference waveform diagram and analyzing the data value.

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

[0037] (3.1) Measuring and resetting to enter the internal resistance of the electromagnetic fuel injector: closing all fuel injector connection circuits, the control chip drives the fuel injector working current sampling circuit to select one group of fuel injector connection circuits, and enters the internal resistance test of the electromagnetic fuel injector;

[0038] (3.2) Injector internal resistance measurement: Injector internal resistance measurement open drive: The control chip drives the IJ OPWM pin end to output low and high levels to control the source and drain of the MOS tube Q of the selected injector channel to be turned on, and drives the TIM0 CH0 pin end to output a high level to control the source and drain of the MOS tube Q1 to be turned on, and the TIM0 CH0ON pin end outputs a low level to control the source and drain of the MOS tube Q2 to be turned off. The injector test power supply current charges the selected channel injector through the resistor R5. The resistor R5, the resistor R8, the resistor R10, and the code group R12 form the injector charging signal circuit. The charging voltage signal is divided and fed back to the ADC2 pin end of the control chip through the resistor R9. The ADC2 pin end collects the charging process electrical signal (0-3.3V). The injector working power supply voltage signal is divided by the resistor R14, the resistor R15, and the resistor R16. The current is then fed back to the ADC1 pin of the control chip through the resistor R17 for collection. The current generated during the operation of the fuel injector is generated by the resistors R21 and R22. A current signal is generated at both ends of the resistors R21 and R22. The signal is amplified by the operational amplifier chip U1, and the amplified current signal is fed back to the ADC0 pin of the control chip. During the fuel injector resistance test, the control chip continuously samples the ADC1 pin and the ADC0 pin, and the sampled data is stored in the control chip. After the sampling is completed, the control chip calculates the internal resistance of the fuel injector.

[0039] (3.3) All control injector channels are subjected to injector resistance measurement: when the test of the selected electromagnetic injector is completed, the control chip detects the electromagnetic injector to be tested, and then another electromagnetic injector is tested, and steps (3.1)-(3.3) are repeated until all connected electromagnetic injectors are tested and then exit; if no test is required, the test is exited directly.

[0040] The beneficial effects of the present invention are as follows: the present invention realizes the judgment of whether a plurality of fuel injectors are damaged, uncharged, or have normal charging and power retention phenomena by setting a multi-channel fuel injector type and state identification detection system, thereby judging whether the fuel injector is in an unconnected state, and identifying the diagnosis of a coil electromagnetic fuel injector or a piezoelectric fuel injector after the fuel injector is normally connected, and the abnormality and short circuit of the fuel injector, and realizes the detection of different types of automobile fuel injectors, improves compatibility, improves the efficiency of detection and testing, and reduces the cost of detection and testing, and realizes the internal resistance test action of the electromagnetic fuel injector, realizes the detection of the electromagnetic fuel injector one by one, ensures consistency, and improves the accuracy of resistance detection, and realizes a multi-channel fuel injector type and state identification detection system that can perform fuel injector identification action and identify the internal resistance detection of the electromagnetic fuel injector, reduces the steps of replacing the device for the fuel injector to be detected, ensures the detection accuracy, and improves the maintenance efficiency.

[0041] The main control module is set up to control and identify the type of fuel injector, control and test the internal resistance of the electromagnetic fuel injector after identification, and feedback the test results; the multi-channel fuel injector identification module is set up to form a multi-type fuel injector identification detection circuit, a fuel injector working current sampling circuit and a fuel injector test channel selection circuit to realize the detection of the fuel injector; the multi-type fuel injector identification detection circuit is used for the identification and detection of the type of fuel injector, so as to determine whether the tested fuel injector is a coil fuel injector or a piezoelectric ceramic fuel injector; the fuel injector working current sampling circuit is used to test the resistance of the electromagnetic fuel injector after detection, so as to detect the resistance value; The injector test channel selection circuit is used for connection and conduction, so as to cooperate with the multi-type injector identification detection circuit and the injector working current sampling circuit to perform injector type identification or resistance testing; the multi-type injector identification detection circuit composed of the injector charge and discharge control circuit, the injector charging signal sampling circuit and the injector voltage acquisition circuit is set to control the test action, the injector charge and discharge control circuit is used for charge and discharge control; the injector charging signal acquisition circuit is used for signal acquisition when the injector is charging; the injector working voltage sampling is used for collecting voltage changes when the injector is working.

[0042] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

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

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

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

[0047] Figure 4 Schematic diagram of the circuit principle of the human-computer interaction operation module of this embodiment;

[0048] Figure 5 Schematic diagram of the circuit principle of the fuel injector interface circuit of this embodiment;

[0049] Figure 6 This is a schematic diagram of the chassis body being exploded in this embodiment;

[0050] Figure 7 Schematic diagram of the circuit principle of the fuel injector working current sampling circuit of this embodiment;

[0051] Figure 8 A schematic diagram of the circuit principle for the fuel injector test channel selection of this embodiment;

[0052] Fig. 9 Schematic diagram of the detection method of this embodiment;

[0053] Fig.10 Schematic diagram of waveform curve judgment of the detection method of this embodiment. DETAILED DESCRIPTION

[0054] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0055] For example, see the attached Figures 1 to 10 A multi-channel fuel injector type and state identification detection system 1 comprises a main control module 2, a multi-channel fuel injector identification module 3 and a human-computer interaction operation module 4, wherein the multi-channel fuel injector identification module 3 and the human-computer 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, test and collect data on the type identification, working current, working voltage and charging signal of the fuel injector, and calculate and analyze the collected data to obtain the fuel injector type (piezoelectric fuel injector, electromagnetic fuel injector), state (unconnected, normal fuel injector, abnormal fuel injector) and resistance value;

[0057] The multi-channel injector identification module 3 includes a multi-type injector identification detection circuit 7, an injector working current sampling circuit 8 and an injector test channel selection circuit 9; the multi-type injector identification detection circuit 7, the injector working current sampling circuit 8 and the injector test channel selection circuit 9 are connected to each other; the multi-type injector identification detection circuit 7 and the injector working current sampling circuit 8 are electrically connected to the injector interface circuit 6; the multi-type injector identification detection circuit 7 is used for the identification and detection of the type of the injector, so as to determine whether the measured injector is a coil injector or a piezoelectric ceramic injector; the injector working current sampling circuit 8 is used to test the resistance of the electromagnetic injector after detection, so as to detect the resistance value; the injector test channel selection circuit 9 is used for the connection and conduction, so as to cooperate with the multi-type injector identification detection circuit 7 and the injector working current sampling circuit 8 to perform injector type, state identification or resistance test action.

[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 charge and discharge control circuit 8, a fuel injector charging signal sampling circuit 9 and a fuel injector voltage acquisition circuit 10; the fuel injector charge and discharge control circuit 8 is used for charge and discharge control; the fuel injector charging signal acquisition circuit is used for signal acquisition when the fuel injector is charging; the fuel injector voltage acquisition circuit 10 is used for the identification of the fuel injector when it is working and the acquisition of voltage changes required for resistance test data calculation;

[0059] The main control module 2 is provided with a TIMO CHO pin end and a TIMO CHO NO pin end, and the injector charge and discharge control circuit 8 is provided with a connection terminal 1, a connection terminal 2 and an injector working power connection terminal INJ Power, wherein the connection terminal 1 is connected to the TIMO CHO pin end, and the connection terminal 2 is connected to the TIMO CHO NO pin end; the injector charge and discharge control circuit 8 includes a MOS tube Q1, a MOS tube Q2 and a rectifier diode D2, and the drain of the MOS tube Q1 is connected to the injector working power connection terminal INJ Power. Power is connected, the gate of the MOS tube Q2 is connected to the connection terminal 1, and a resistor R4 is provided between the gate of the MOS tube Q2 and the connection terminal 1; the source of the MOS tube Q1 is connected to the drain of the MOS tube Q2; a resistor R7 is provided between the source of the MOS tube Q1 and the drain of the MOS tube Q2; the gate of the MOS tube Q2 is connected to the connection terminal 2; the source of the MOS tube 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 2;

[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 is provided with an ADC2 pin end and an ADC1 pin end; the injector charging signal sampling circuit 9 includes a plurality of resistors and a capacitor C6, the plurality of resistors include a resistor R5, a resistor R8, a resistor R10 and a resistor R12 connected in series in sequence, one end of the resistor R5 is connected to the injector working power connection terminal INJ Power; a connection terminal three is provided between the resistor R5 and the resistor R8, the connection terminal three is connected to the resistor R6, and the connection terminal three is connected to the injector test common terminal INJ COM; one end of the resistor R12 is respectively connected to the source of the MOS tube and one end of the capacitor C6, a connection terminal four is provided between the resistor R8 and the resistor R10, the other ends of the connection terminal four and the capacitor C6 are both connected to the ADC2 pin end, and a resistor R9 is provided between the connection terminal four and the ADC2 pin end;

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

[0063] The main control chip is provided with an ADC0 pin end; the injector working current sampling circuit 8 includes 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 a -IN pin end; the OUT pin end is connected to the ADC0 pin end, the +IN pin end is connected to one end of the resistor R25, the -IN pin end is connected to one end of the resistor R15, the other end of the resistor R15 is connected with 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 end; the V+ pin end is connected with a capacitor C7;

[0064] A resistor R26 is provided between the ADC0 pin end and the OUT pin end, a connection terminal seven is provided between the resistor R26 and the ADC0 pin end, 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 end, and an inductor FB2 is connected to the connection terminal eight; a resistor R16 is provided 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 connection terminal nine is provided between the resistor R25 and the resistor R21, and a current sampling connection terminal OCOM is connected to the current sampling connection terminal OCOM, and the current sampling connection terminal OCOM is connected to the injector test channel selection circuit 9; a voltage stabilizing diode DZ1 is also connected between the +IN pin end and the -IN pin end, and the voltage stabilizing diode DZ1 is used for voltage stabilization.

[0065] The main control chip is also provided with a plurality of drive pin terminals IJ OPWM; the injector test channel selection circuit 9 includes a plurality of groups of injector connection circuits, and the plurality of groups of the injector connection circuits are connected and conducted in a parallel connection manner; the plurality of groups of the injector connection circuits all include a conduction MOS tube Q, a resistor R13 and a resistor R19, the source of the conduction MOS tube Q is connected to the current sampling connection terminal OCOM, and the drain of the conduction MOS tube Q is connected to the injector test common terminal INJ COM; a voltage stabilizing diode D3 is provided between the drain of the conduction MOS tube Q and the injector test common terminal INJ COM, and a connection terminal ten is provided between the voltage stabilizing diode D3 and the drain of the conduction MOS tube Q, and the connection terminal ten is connected to the injector interface circuit 6; one end of the resistor R13 is provided with a P+ connection terminal, and the P+ connection terminal is used to connect a 12V power supply; the other end of the resistor R13 is connected to the gate of the conduction MOS tube Q and the drive pin terminal IJ OPWM connection; a connection terminal 11 is provided between the other end of the resistor R13 and the gate of the conductive MOS tube Q; the connection terminal 11 is connected to one end of the resistor R19;

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

[0067] The injector interface circuit 6 includes a plurality of IJ Contr pin ends and IN JECT pin ends, wherein the IJ Contr pin ends are respectively connected to the connection end 10, and the IJ Contr pin ends are respectively connected to one of the wiring terminals of the injector, thereby realizing the function of electrical connection and conduction control of the plurality of injectors; the IN JECT pin end is connected to one end of the resistor R6, and the N JECT pin end is connected to the other wiring terminal of the injector;

[0068] The main control chip is provided with a USART2 TX pin end and a USART2 RX pin end; the human-computer interaction operation module 4 includes a display chip P1 and an inductor FB1, the display chip P1 is provided with a TX pin end and an RX pin end, the TX pin end is connected to the USART2 TX pin end, and the RX pin end is connected to the USART2 RX pin end; resistors are provided 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 FB1 is connected to the display chip P1, and the other end of the inductor FB1 is connected to the P+ connection end.

[0069] The main control chip is also provided with an operation indicator pin end, a system pressure sensor pin end, an abnormal error drive output pin end, a VBAT pin end and multiple groups of power supply pin ends; the operation indicator pin end is connected with an operation indicator module; the system pressure sensor pin end is connected with a pressure sensor module connection; the multiple groups of power supply pin ends all include a VDD pin end and a VSS pin end, and a capacitor C is connected between the VDD pin end and the VSS pin end;

[0070] The VDD pin end, the VBAT pin end, and the other end of the inductor FB2 are all connected with a power connection end S, and the power connection end S is used to provide a 3V3 power supply; the VBAT pin end is also provided with a capacitor C1, and 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, the emitter of the transistor Q4 and the connection end of the resistor R19 are all connected with a GND connection end, and the GND connection end is used to connect the negative electrode of the power supply.

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

[0072] (1) Injector connection and power-on: The injectors to be tested are respectively connected to the injector interface circuit 6, and are electrically connected using a socket connection structure, so that one terminal of the injector is connected to the IJ CONTR pin, and the other terminal of the injector is connected to the IN JECT pin; the multi-channel injector type and state identification and detection system 1 is started to perform a power-on test;

[0073] (2) Injector type identification: After startup, the control chip controls the multi-type injector identification detection circuit 7 to open each injector one by one to perform charging and discharging actions, and feeds back the voltage change data obtained during the charging and discharging actions to the control chip for processing. The control chip feeds back the test results to the human-computer interaction operation module 4 based on the obtained data of the voltage change process, and determines the type and state of the tested injector, determines whether the injector is a piezoelectric injector or an electromagnetic injector, and determines whether the test channel is in the injector disconnected state, the injector is normal, the injector is abnormal, or short-circuited; when the tested voltage change maintains a low voltage and the voltage does not change within the test time period, the 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, the injector is disconnected, the injector is abnormal, or short-circuited, the injector in the abnormal state is intuitively fed back to the tester through the human-computer interaction module, and the tester further confirms;

[0074] (3) Internal resistance test of electromagnetic fuel injectors: the control chip tests the electromagnetic fuel injectors classified by the fuel injector type identification one by one, closes the channels of non-electromagnetic fuel injectors, and then drives the electromagnetic fuel injectors to perform internal resistance test; the 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 control chip for data processing. After the processing is completed, the data is displayed through the human-computer interaction operation module 4, so that the tester knows the test data and understands the status of the electromagnetic fuel injector;

[0075] (4) Test completed: The 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 injectors based on the displayed information, and then conduct the test connection of the next group of injectors to be tested. The entire identification and inspection process is completed.

[0076] The detection method (2) further comprises the following steps:

[0077] (2.1) When the control chip is tested, the injector test channel selection circuit 9 is controlled to select the injector test channel that needs to be identified, and the injector charge and discharge control circuit 8 controls the injector to perform charge and discharge actions;

[0078] (2.2) During the discharge process, the driving pin IJ OPWM outputs a low level to control the source and drain of the selected injector channel to be turned on, the driving pin TIMO CHO outputs a low level to control the source and drain of the MOS tube Q1 to be turned off, and the driving pin TIMO CH0 ON outputs a high level to control the source and drain of the MOS tube Q2 to be turned on. The selected injector channel's turned-on MOS tube Q and MOS tube Q2 form a current loop to consume the electricity stored in the injector;

[0079] (2.3) After the discharge is completed, charging is performed. After the discharge is completed, the charging process begins. The control chip drives the pin end IJOPWM to output a low level to control the source and drain of the conduction MOS tube Q of the selected injector channel to be turned on, and drives the TIMO CHO pin end and the TIM0 CH0 ON pin end to output a low level to control the MOS tube Q1. The source and drain of the MOS tube Q2 are turned off. The injector test power supply charges the selected injector channel through the resistor R5. The injector charging signal sampling circuit 9 composed of the resistors R5, R8, R10 and R12 collects the charging signal. The charging voltage signal is divided and fed back to the ADC2 pin end of the control chip through the resistor R9. The ADC2 pin end feeds back the collected charging process electrical signal (0-3.3V) to the control chip. The working power supply signal of the selected injector is divided by the resistors R14, R15 and R16 and fed back to the ADC1 pin end of the control chip through the resistor R17 for collection.

[0080] The current generated during the operation of the selected fuel injector passes through the two ends of the resistor R21 and the resistor R22 to generate a current signal, which is amplified by the operational amplifier chip U1, and the amplified current signal is fed back to the ADC0 pin of the control chip for collection; during the charging process of the selected fuel injector, the control chip continuously collects data from the ADC1 pin and the ADC2 pin, and the collected data is stored in the main control chip, which performs type and status recognition;

[0081] (2.4) Injector identification: The control chip uses waveform curve data to make the following judgments to identify the type and status of the injector, where 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 injector: the power in the piezoelectric injector is discharged from the test time T0 to T1; the injector starts to be charged from 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 during the test time T1-T20. The control chip determines that the injector is not connected by calculating and comparing the charging waveform curve data, referring to the waveform diagram, and analyzing the data value;

[0083] When the channel is first connected to a normal piezoelectric fuel injector: the power in the piezoelectric fuel injector is emptied from the test time T0 to T1; the fuel injector starts to be charged from the test time T1. Since the current changes from large to small during the charging process, there is an obvious charging curve waveform during the test time T1-T20, and the charging time is normal. The control chip determines that the fuel injector is a normal piezoelectric ceramic fuel injector by calculating and comparing the waveform curve data, referring to the waveform diagram, and analyzing the data value;

[0084] When the channel is selected to connect to the abnormal piezoelectric ceramic fuel injector: the power in the piezoelectric ceramic fuel injector is discharged from the test time T0 to T1; the piezoelectric ceramic fuel injector starts to charge from the test time T1. Since the current changes from large to small during the charging process, there is an obvious charging curve waveform in the test time T1-T20, but the charging time is short. The control chip calculates and compares the waveform curve data, refers to the waveform diagram, analyzes the data value, and determines that the piezoelectric ceramic fuel injector has charging abnormality;

[0085] When the selected channel is connected to the electromagnetic fuel injector: the power in the piezoelectric fuel injector is discharged from the test time T0 to T1; the fuel injector starts to charge from the test time T1. Since a large current is maintained during the charging process, the non-charging waveform is kept at a low level during the test time T1-T20. The control chip determines the electromagnetic fuel injector by calculating and comparing the waveform curve data with the reference waveform diagram and analyzing the data value.

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

[0087] (3.1) Measuring and resetting to enter the internal resistance of the electromagnetic fuel injector: closing all fuel injector connection circuits, the control chip drives the fuel injector working current sampling circuit 8 to select one group of fuel injector connection circuits, and enters the internal resistance test of the electromagnetic fuel injector;

[0088] (3.2) Injector internal resistance measurement: Injector internal resistance measurement open drive: The control chip drives the IJ OPWM pin end to output low and high levels to control the source and drain of the MOS tube Q of the selected injector channel to be turned on, and drives the TIM0 CH0 pin end to output a high level to control the source and drain of the MOS tube Q1 to be turned on, and the TIM0 CH0ON pin end outputs a low level to control the source and drain of the MOS tube Q2 to be turned off. The injector test power supply current charges the selected channel injector through the resistor R5. The resistor R5, the resistor R8, the resistor R10, and the code group R12 form the injector charging signal circuit. The charging voltage signal is divided and fed back to the ADC2 pin end of the control chip through the resistor R9. The ADC2 pin end collects the charging process electrical signal (0-3.3V). The injector working power supply voltage signal is divided by the resistor R14, the resistor R15, and the resistor R16. The current is then fed back to the ADC1 pin of the control chip through the resistor R17 for collection. The current generated during the operation of the fuel injector is generated by the resistors R21 and R22. A current signal is generated at both ends of the resistors R21 and R22. The signal is amplified by the operational amplifier chip U1, and the amplified current signal is fed back to the ADC0 pin of the control chip. During the fuel injector resistance test, the control chip continuously samples the ADC1 pin and the ADC0 pin, and the sampled data is stored in the control chip. After the sampling is completed, the control chip calculates the internal resistance of the fuel injector.

[0089] (3.3) All control injector channels are subjected to injector resistance measurement: when the test of the selected electromagnetic injector is completed, the control chip detects the electromagnetic injector to be tested, and then another electromagnetic injector is tested, and steps (3.1)-(3.3) are repeated until all connected electromagnetic injectors are tested and then exit; if no test is required, the test is exited directly.

[0090] The present invention can determine whether a plurality of fuel injectors are damaged, uncharged, or have normal charging and power retention phenomena by setting a multi-channel fuel injector type and state identification detection system, thereby determining whether the fuel injectors are in an unconnected state, identifying the diagnosis of a coil electromagnetic fuel injector or a piezoelectric fuel injector after the fuel injector is normally connected, and detecting abnormalities and short circuits of fuel injectors, thereby detecting different types of automotive fuel injectors, improving compatibility, improving the efficiency of detection and testing, and reducing the cost of detection and testing, and realizing the internal resistance test action of electromagnetic fuel injectors, realizing the detection of electromagnetic fuel injectors one by one, ensuring consistency, and improving the accuracy of resistance detection, realizing a multi-channel fuel injector type and state identification detection system that can perform fuel injector identification actions and identify internal resistance detection of electromagnetic fuel injectors, reducing the steps of replacing devices for fuel injectors to be detected, ensuring detection accuracy, and improving maintenance efficiency.

[0091] The main control module is set up to control and identify the type of fuel injector, control and test the internal resistance of the electromagnetic fuel injector after identification, and feedback the test results; the multi-channel fuel injector identification module is set up to form a multi-type fuel injector identification detection circuit, a fuel injector working current sampling circuit and a fuel injector test channel selection circuit to realize the detection of the fuel injector; the multi-type fuel injector identification detection circuit is used for the identification and detection of the type of fuel injector, so as to determine whether the tested fuel injector is a coil fuel injector or a piezoelectric ceramic fuel injector; the fuel injector working current sampling circuit is used to test the resistance of the electromagnetic fuel injector after detection, so as to detect the resistance value; The injector test channel selection circuit is used for connection and conduction, so as to cooperate with the multi-type injector identification detection circuit and the injector working current sampling circuit to perform injector type identification or resistance testing; the multi-type injector identification detection circuit composed of the injector charge and discharge control circuit, the injector charging signal sampling circuit and the injector voltage acquisition circuit is set to control the test action, the injector charge and discharge control circuit is used for charge and discharge control; the injector charging signal acquisition circuit is used for signal acquisition when the injector is charging; the injector working voltage sampling is used for collecting voltage changes when the injector is working.

[0092] The present invention is not limited to the above-mentioned embodiments. Other multi-channel injector type and state identification detection systems 1 and detection methods obtained by using the same or similar structures, devices, processes or methods as the above-mentioned embodiments of the present invention are within the protection scope of the present invention.

Claims

1. A multi-channel fuel injector type and state identification and detection system, characterized in that: The multi-channel fuel injector type and state identification detection system comprises a main control module, a multi-channel fuel injector identification module and a human-computer interaction operation module, wherein the multi-channel fuel injector identification module and the human-computer 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; The main control module is used to control the operation of the multi-channel fuel injector identification module, test and collect data on the type identification, working current, working voltage and charging signal of the fuel injector, and calculate and analyze the collected data to obtain the fuel injector type (piezoelectric fuel injector, electromagnetic fuel injector), state (unconnected, normal fuel injector, abnormal fuel injector) and resistance value; The multi-channel injector identification module includes a multi-type injector identification detection circuit, an injector working current sampling circuit and an injector test channel selection circuit; the multi-type injector identification detection circuit, the injector working current sampling circuit and the injector test channel selection circuit are connected to each other; the multi-type injector identification detection circuit and the injector working current sampling circuit are electrically connected to the injector interface circuit; the multi-type injector identification detection circuit is used for the identification and detection of the type of the injector, so as to determine whether the measured injector is a coil-type injector or a piezoelectric ceramic injector; the injector working current sampling circuit is used for testing the resistance of the electromagnetic injector after detection, so as to detect the resistance value; the injector test channel selection circuit is used for the connection and conduction, so as to cooperate with the multi-type injector identification detection circuit and the injector working current sampling circuit to perform injector type, state identification or resistance testing.

2. The multi-channel fuel injector type and state identification and detection system according to claim 1 is characterized in that: The main control module includes a main control chip; the multi-type fuel injector identification and detection circuit includes a fuel injector charge and discharge control circuit, a fuel injector charging signal sampling circuit and a fuel injector voltage acquisition circuit; the fuel injector charge and discharge control circuit is used for charge and discharge control; the fuel injector charging signal acquisition circuit is used for signal acquisition when the fuel injector is charging; the fuel injector voltage acquisition circuit is used for identification of the fuel injector when it is working and for collecting the voltage change required for calculating the resistance test data; The main control module is provided with a TIMO CHO pin end and a TIMO CHO NO pin end, and the injector charge and discharge control circuit is provided with a connection end 1, a connection end 2 and an injector working power connection end INJ Power, wherein the connection end 1 is connected to the TIMO CHO pin end, and the connection end 2 is connected to the TIMO CHO NO pin end; the injector charge and discharge control circuit comprises a MOS tube Q1, a MOS tube Q2 and a rectifier diode D2, wherein the drain of the MOS tube Q1 is connected to the injector working power connection end INJ Power, the gate of the MOS tube Q2 is connected to the connection end 1, and a resistor R4 is provided between the gate of the MOS tube Q2 and the connection end 1; the source of the MOS tube Q1 is connected to the drain of the MOS tube Q2; a resistor R7 is provided between the source of the MOS tube Q1 and the drain of the MOS tube Q2; the gate of the MOS tube Q2 is connected to the connection end 2; the source of the MOS tube 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 end 2; 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 .

3. The multi-channel fuel injector type and state identification and detection system according to claim 2 is characterized in that: The main control chip is provided with an ADC2 pin end and an ADC1 pin end; the injector charging signal sampling circuit includes a plurality of resistors and a capacitor C6, the plurality of resistors include a resistor R5, a resistor R8, a resistor R10 and a resistor R12 connected in series in sequence, one end of the resistor R5 is connected to the injector working power connection terminal INJ Power; a connection terminal three is provided between the resistor R5 and the resistor R8, the connection terminal three is connected to the resistor R6, and the connection terminal three is connected to the injector test common terminal INJ COM; one end of the resistor R12 is respectively connected to the source of the MOS tube and one end of the capacitor C6, a connection terminal four is provided between the resistor R8 and the resistor R10, the other ends of the connection terminal four and the capacitor C6 are both connected to the ADC2 pin end, and a resistor R9 is provided between the connection terminal four and the ADC2 pin end; The injector working voltage sampling circuit includes a resistor R14, a resistor R24, and a resistor R27 connected in series in sequence, the other end of the resistor R14 is connected to one end of the resistor R5; a connection terminal five is provided between the resistor R14 and the resistor R24, and the connection terminal five is connected to the ADC1 pin end; a resistor R17 is provided between the connection terminal five and the ADC1 pin end; a connection terminal six is ​​provided between the resistor R17 and the ADC1 pin end; and a capacitor C8 is connected to the connection terminal six.

4. The multi-channel fuel injector type and state identification and detection system according to claim 3 is characterized in that: The main control chip is provided with an ADC0 pin end; the injector working current sampling circuit includes 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 a -IN pin end; the OUT pin end is connected to the ADC0 pin end, the +IN pin end is connected to one end of the resistor R25, the -IN pin end is connected to one end of the resistor R15, the other end of the resistor R15 is connected with 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 end; the V+ pin end is connected with a capacitor C7; A resistor R26 is provided between the ADC0 pin end and the OUT pin end, a connection terminal seven is provided between the resistor R26 and the ADC0 pin end, 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 end, 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 end; one or more resistors R22 are connected in parallel between the resistor R25 and the resistor R15; a connection terminal nine is provided between the resistor R25 and the resistor R21, and a current sampling connection terminal OCOM is connected to the current sampling connection terminal OCOM, and the current sampling connection terminal OCOM is connected to the injector test channel selection circuit; a voltage stabilizing diode DZ1 is also connected between the +IN pin end and the -IN pin end.

5. The multi-channel fuel injector type and state identification and detection system according to claim 4 is characterized in that : The main control chip is also provided with a plurality of drive pin terminals IJ OPWM; the injector test channel selection circuit includes a plurality of groups of injector connection circuits, and the plurality of groups of the injector connection circuits are connected and conducted in a parallel connection manner; the plurality of groups of the injector connection circuits all include a conduction MOS tube Q, a resistor R13 and a resistor R19, the source of the conduction MOS tube Q is connected to the current sampling connection terminal OCOM, and the drain of the conduction MOS tube Q is all connected to the injector test common terminal INJ COM; a voltage stabilizing diode D3 is provided between the drain of the conduction MOS tube Q and the injector test common terminal INJ COM, and a connection terminal ten is provided between the voltage stabilizing diode D3 and the drain of the conduction MOS tube Q, and the connection terminal ten is connected to the injector interface circuit; one end of the resistor R13 is provided with a P+ connection terminal, and the P+ connection terminal is used to connect a 12V power supply; the other end of the resistor R13 is connected to the gate of the conduction MOS tube Q and the drive pin terminal IJ OPWM connection; a connection terminal 11 is provided between the other end of the resistor R13 and the gate of the conductive MOS tube Q; the connection terminal 11 is connected to one end of the resistor R19; The injector connection circuit is also provided with a transistor Q4, the base of the transistor Q4 is connected to the drive pin end IJ OPWM, the collector of the transistor Q4 is connected to the resistor R13, and the emitter of the transistor Q4 is connected to the other end of the resistor R19; a resistor R20 is also provided at the other end of the resistor R19, and the resistor R20 is connected to the base of the transistor Q4; a resistor R18 is provided between the transistor Q4 and the drive pin end IJ OPWM.

6. The multi-channel fuel injector type and state identification and detection system according to claim 5, characterized in that: The injector interface circuit includes a plurality of IJ Contr pin ends and IN JECT pin ends, wherein the IJ Contr pin ends are respectively connected to the connection end 10, and the IJ Contr pin ends are respectively connected to one of the wiring terminals of the injector, thereby realizing the function of electrical connection and conduction control of the plurality of injectors; the IN JECT pin end is connected to one end of the resistor R6, and the N JECT pin end is connected to the other wiring terminal of the injector; The main control chip is provided with a USART2 TX pin end and a USART2 RX pin end; the human-computer interaction operation module includes a display chip P1 and an inductor FB1, the display chip P1 is provided with a TX pin end and an RX pin end, the TX pin end is connected to the USART2 TX pin end, and the RX pin end is connected to the USART2 RX pin end; resistors are provided 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 FB1 is connected to the display chip P1, and the other end of the inductor FB1 is connected to the P+ connection end.

7. The multi-channel fuel injector type and state identification and detection system according to claim 6 is characterized in that: The main control chip is also provided with an operation indicator pin end, a system pressure sensor pin end, an abnormal error drive output pin end, a VBAT pin end and multiple groups of power supply pin ends; the operation indicator pin end is connected with an operation indicator module; the system pressure sensor pin end is connected with a pressure sensor module connection; the multiple groups of power supply pin ends all include a VDD pin end and a VSS pin end, and a capacitor C is connected 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 FB2 are all connected with a power connection end S, and the power connection end S is used to provide a 3V3 power supply; the VBAT pin end is also provided with a capacitor C1, and 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, the emitter of the transistor Q4 and the connection end of the resistor R19 are all connected with a GND connection end, and the GND connection end is used to connect the negative electrode of the power supply.

8. A detection method for implementing the multi-channel fuel injector type and state identification detection system according to any one of claims 1 to 7, characterized in that: It includes the following steps: (1) Injector connection and power-on: The injectors to be tested are respectively connected to the injector interface circuit, and are electrically connected using a socket connection structure, so that one terminal of the injector is connected to the IJ CONTR pin, and the other terminal of the injector is connected to the IN JECT pin; the multi-channel injector type and state identification detection system is started to perform power-on test; (2) Injector type identification: After startup, the control chip controls the multi-type injector identification detection circuit to open each injector one by one to perform charging and discharging actions, and feeds back the voltage change data obtained during the charging and discharging actions to the control chip for processing. The control chip feeds back the test results to the human-computer interaction operation module based on the obtained voltage change process data, and determines the type and state of the tested injector, determines whether the injector is a piezoelectric injector or an electromagnetic injector, and determines whether the test channel is in the injector disconnected state, the injector is normal, the injector is abnormal, or short-circuited; when the tested voltage change maintains a low voltage and the voltage does not change within the test time period, the 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, the injector is disconnected, the injector is abnormal, or short-circuited, the injector in the abnormal state is intuitively fed back to the tester through the human-computer interaction module, and the tester further confirms; (3) Internal resistance test of electromagnetic fuel injectors: the control chip tests the electromagnetic fuel injectors classified by the fuel injector type identification one by one, closes the channels of non-electromagnetic fuel injectors, and then drives the electromagnetic fuel injectors to perform internal resistance test; the 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 control chip for data processing. After the processing is completed, the data is displayed through the human-computer interaction operation module, so that the tester knows the test data and understands the status of the electromagnetic fuel injector; (4) Test completed: The 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 injectors based on the displayed information, and then conduct the test connection of the next group of injectors to be tested. The entire identification and inspection process is completed.

9. The detection method according to claim 8, characterized in that: The method (2) further comprises the following steps: (2.1) When the control chip is tested, the injector test channel selection circuit is controlled to select the injector test channel that needs to be identified, and the injector charge and discharge control circuit controls the injector to perform charge and discharge actions; (2.2) During the discharge process, the driving pin IJ OPWM outputs a low level to control the source and drain of the selected injector channel to be turned on, the driving pin TIMO CHO outputs a low level to control the source and drain of the MOS tube Q1 to be turned off, and the driving pin TIMO CH0 ON outputs a high level to control the source and drain of the MOS tube Q2 to be turned on. The selected injector channel's turned-on MOS tube Q and MOS tube Q2 form a current loop to consume the electricity stored in the injector; (2.3) After the discharge is completed, charging is performed. After the discharge is completed, the charging process begins. The control chip drives the pin end IJ OPWM to output a low level to control the source and drain of the conduction MOS tube Q of the selected injector channel to be turned on, and drives the TIMO CHO pin end and the TIM0 CH0 ON pin end to output a low level to control the MOS tube Q1. The source and drain of the MOS tube Q2 are turned off. The injector test power supply charges the selected injector channel through the resistor R5. The injector charging signal sampling circuit composed of the resistors R5, R8, R10 and R12 collects the charging signal. The charging voltage signal is divided and fed back to the ADC2 pin end of the control chip through the resistor R9. The ADC2 pin end feeds back the collected charging process electrical signal (0-3.3V) to the control chip. The working power supply signal of the selected injector is divided by the resistors R14, R15 and R16 and fed back to the ADC1 pin end of the control chip through the resistor R17 for collection. The current generated during the operation of the selected fuel injector passes through the two ends of the resistor R21 and the resistor R22 to generate a current signal, which is amplified by the operational amplifier chip U1, and the amplified current signal is fed back to the ADC0 pin of the control chip for collection; during the charging process of the selected fuel injector, the control chip continuously collects data from the ADC1 pin and the ADC2 pin, and the collected data is stored in the main control chip, which performs type and status recognition; (2.4) Injector identification: The control chip uses waveform curve data to make the following judgments to identify the type and status of the injector, where the test time is T0-T1, T1-T20, and the voltage is 0V-3.3V; When the selected channel is not connected to the injector: the power in the piezoelectric injector is discharged from the test time T0 to T1; the injector starts to be charged from 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 during the test time T1-T20. The control chip determines that the injector is not connected by calculating and comparing the charging waveform curve data, referring to the waveform diagram, and analyzing the data value; When the channel is first connected to a normal piezoelectric fuel injector: the power in the piezoelectric fuel injector is emptied from the test time T0 to T1; the fuel injector starts to be charged from the test time T1. Since the current changes from large to small during the charging process, there is an obvious charging curve waveform during the test time T1-T20, and the charging time is normal. The control chip determines that the fuel injector is a normal piezoelectric ceramic fuel injector by calculating and comparing the waveform curve data, referring to the waveform diagram, and analyzing the data value; When the channel is selected to connect to the abnormal piezoelectric ceramic fuel injector: the power in the piezoelectric ceramic fuel injector is discharged from the test time T0 to T1; the piezoelectric ceramic fuel injector starts to charge from the test time T1. Since the current changes from large to small during the charging process, there is an obvious charging curve waveform in the test time T1-T20, but the charging time is short. The control chip calculates and compares the waveform curve data, refers to the waveform diagram, analyzes the data value, and determines that the piezoelectric ceramic fuel injector has charging abnormality; When the selected channel is connected to the electromagnetic fuel injector: the power in the piezoelectric fuel injector is discharged from the test time T0 to T1; the fuel injector starts to charge from the test time T1. Since a large current is maintained during the charging process, the non-charging waveform is kept at a low level during the test time T1-T20. The control chip determines the electromagnetic fuel injector by calculating and comparing the waveform curve data with the reference waveform diagram and analyzing the data value.

10. The detection method according to claim 8, characterized in that: The (3) comprises the following steps: (this step is the step of internal resistance testing) (3.1) Measuring and resetting to enter the internal resistance of the electromagnetic fuel injector: closing all fuel injector connection circuits, the control chip drives the fuel injector working current sampling circuit to select one group of fuel injector connection circuits, and enters the internal resistance test of the electromagnetic fuel injector; (3.2) Injector internal resistance measurement: Injector internal resistance measurement open drive: The control chip drives the IJ OPWM pin end to output low and high levels to control the source and drain of the MOS tube Q of the selected injector channel to be turned on, and drives the TIM0 CH0 pin end to output a high level to control the source and drain of the MOS tube Q1 to be turned on, and the TIM0 CH0ON pin end outputs a low level to control the source and drain of the MOS tube Q2 to be turned off. The injector test power supply current charges the selected channel injector through the resistor R5. The resistor R5, the resistor R8, the resistor R10, and the code group R12 form the injector charging signal circuit. The charging voltage signal is divided and fed back to the ADC2 pin end of the control chip through the resistor R9. The ADC2 pin end collects the charging process electrical signal (0-3.3V). The injector working power supply voltage signal is divided by the resistor R14, the resistor R15, and the resistor R16. The current is then fed back to the ADC1 pin of the control chip through the resistor R17 for collection. The current generated during the operation of the fuel injector is generated by the resistors R21 and R22. A current signal is generated at both ends of the resistors R21 and R22. The signal is amplified by the operational amplifier chip U1, and the amplified current signal is fed back to the ADC0 pin of the control chip. During the fuel injector resistance test, the control chip continuously samples the ADC1 pin and the ADC0 pin, and the sampled data is stored in the control chip. After the sampling is completed, the control chip calculates the internal resistance of the fuel injector. (3.3) All control injector channels are subjected to injector resistance measurement: when the test of the selected electromagnetic injector is completed, the control chip detects the electromagnetic injector to be tested, and then another electromagnetic injector is tested, and steps (3.1)-(3.3) are repeated until all connected electromagnetic injectors are tested and then exit; if no test is required, the test is exited directly.

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