Test method, test control device and test system of oil injection control circuit

Abstract

The invention provides a test method, a test control device and a test system of an oil injection control circuit, and the test method of the oil injection control circuit comprises the steps: disconnecting a path between a power supply and a power supply port of the oil injection control circuit, and disconnecting a path between the power supply port and a low-side driving unit in the oil injection control circuit at the same time, wherein the voltage of the driving signal received by the low-side driving unit is synchronous with the voltage at the power supply port; acquiring a voltage value at the power supply port monitored by a voltage monitoring module; whether the fuel injection control circuit is in a safe state or not is determined based on the voltage value, and the safe state is that the fuel injection control circuit does not break down when communicating with the fuel injector; if yes, a logic power supply access in a control chip in the oil injection control circuit is disconnected, and the oil injection control circuit is controlled to start to execute test operation. In this way, the burning loss problem of the oil injection control circuit can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of fuel injection control circuits, and in particular to a testing method, a testing control device and a testing system for fuel injection control circuits. Background Art

[0002] Currently, there are many defective products with burning problems in the mass-produced fuel injection control devices including fuel injection control circuits, both in engineering and in the market. However, the root cause of the burning has not been found, and the burning problem cannot be solved.

[0003] Therefore, how to solve the burning problem of the fuel injection control circuit in the fuel injection control device has become an urgent problem to be solved. Summary of the invention

[0004] In view of this, the present invention provides a test method, a test control device and a test system for a fuel injection control circuit, which can solve the problem of burning of the fuel injection control circuit.

[0005] To solve the above technical problems, on the one hand, the present invention provides a test method for an injection control circuit, which is a test control device in a test system of the injection control circuit, and the test control device is connected to a voltage monitoring module in the test system, including: disconnecting the path between the power supply and the power supply port of the injection control circuit, and disconnecting the path between the power supply port and the low-side drive unit in the injection control circuit, wherein the voltage of the drive signal received by the low-side drive unit is synchronized with the voltage at the power supply port; obtaining the voltage value at the power supply port monitored by the voltage monitoring module; determining whether the injection control circuit is in a safe state based on the voltage value, and the safe state is that the injection control circuit will not fail when connected to the injector; if so, disconnecting the logic power supply path inside the control chip in the injection control circuit, and controlling the injection control circuit to start executing the test operation.

[0006] According to some embodiments of the present invention, after a preset rest time since the power supply is disconnected, a step is performed of obtaining a voltage value at the power supply port monitored by a voltage monitoring module, and determining whether the injection control circuit is in a safe state based on the voltage value.

[0007] According to some embodiments of the present invention, if the fuel injection control circuit is not in a safe state, the test operation on the fuel injection control circuit is terminated.

[0008] According to some embodiments of the present invention, the voltage monitoring module is used to monitor the voltage value at the power supply port in real time, and the step of determining whether the injection control circuit is in a safe state based on the voltage value includes: based on the real-time voltage value at the power supply port, determining whether the injection control circuit reaches a safe state within a preset standstill time after the power supply is turned off.

[0009] According to some embodiments of the present invention, in response to the fuel injection control circuit not reaching a safe state within a preset idle time after the power supply is turned off, the test operation on the fuel injection control circuit is terminated.

[0010] According to some embodiments of the present invention, the step of determining whether the injection control circuit is in a safe state based on the voltage value includes: comparing the voltage value and a preset voltage threshold; in response to the voltage value being greater than or equal to the preset voltage threshold, determining that the injection control circuit is not in a safe state; in response to the voltage value being less than the preset voltage threshold, determining that the injection control circuit is in a safe state.

[0011] According to some embodiments of the present invention, the low-side driving unit includes a low-side driving MOS tube, and the preset voltage threshold is a minimum turn-on voltage value of the low-side driving MOS tube.

[0012] According to some embodiments of the present invention, the test operation includes at least one test task, and the method also includes: generating a test result after controlling the injection control circuit to execute all test tasks; determining whether the injection control circuit is qualified based on the test result; if so, allowing the injection control circuit to enter the factory process; if not, allowing the injection control circuit to enter the maintenance or scrapping process.

[0013] According to some embodiments of the present invention, before generating a test result, the path between the power supply and the power supply port is disconnected, and the path between the power supply port and the low-side drive unit is disconnected; the voltage value at the power supply port monitored by the voltage monitoring module is obtained; based on the voltage value, it is determined whether the injection control circuit is in a safe state; in response to the injection control circuit being in a safe state, the logic power supply path inside the control chip in the injection control circuit is disconnected, and the step of generating a test result is executed.

[0014] According to some embodiments of the present invention, the method also includes: determining whether the remaining unexecuted test tasks in the test operation need to start the injection control circuit; if not, at any time in the time period between the start time of the remaining first test task and the start time of the remaining last test task, disconnecting the path between the power supply and the power supply port, and disconnecting the path between the power supply port and the low-side drive unit; before the step of generating the test result, including: obtaining the voltage value at the power supply port monitored by the voltage monitoring module; determining whether the injection control circuit is in a safe state based on the voltage value; in response to the injection control circuit being in a safe state, disconnecting the logic power supply path inside the control chip in the injection control circuit, and executing the step of generating the test result.

[0015] According to some embodiments of the present invention, the test operation includes at least a charge-discharge cycle test task, an input / output test task, a fuel injector test task, and a dynamic data test task that are executed in sequence.

[0016] In a second aspect, an embodiment of the present invention provides a test control device, including:

[0017] A power-off module is used to disconnect the path between the power supply and the power supply port of the injection control circuit, and at the same time disconnect the path between the power supply port and the low-side drive unit in the injection control circuit, wherein the voltage of the drive signal received by the low-side drive unit is synchronized with the voltage at the power supply port.

[0018] The acquisition module is used to obtain the voltage value at the power supply port monitored by the voltage monitoring module.

[0019] The safety state determination module is used to determine whether the fuel injection control circuit is in a safe state based on the voltage value. The safe state means that the fuel injection control circuit will not fail when connected to the fuel injector.

[0020] The test module is used to disconnect the logic power supply path inside the control chip in the fuel injection control circuit when the fuel injection control circuit is in a safe state, and control the fuel injection control circuit to start performing a test operation.

[0021] In a third aspect, an embodiment of the present invention provides a test system for a fuel injection control circuit, comprising:

[0022] The test control device in the above technical solution is connected to the fuel injection control circuit.

[0023] The voltage monitoring module is connected to the power supply port of the injection control circuit and the test control device, and is used to monitor the voltage value at the power supply port and send it to the test control device.

[0024] The above technical solution of the present invention has at least one of the following beneficial effects: by monitoring the voltage value of the power supply port of the injection control circuit, it is determined whether the signal applied to the low-side driving MOS tube is completely discharged, that is, whether the injection control circuit is in a safe state according to the voltage value; when it is determined that the injection control circuit is in a safe state, that is, the injection control circuit will not fail when connected to the injector, the test operation is started, thereby avoiding the occurrence of a half-conduction fault of the low-side driving MOS tube, improving the safety of the injection control circuit test, and reducing the damage rate of the injection control circuit.

[0025] Furthermore, when subsequent test tasks do not need to be powered on, the path between the power supply port PTIGN2 and the low-side driver unit is disconnected at any time after the current test task ends and before the subsequent test task starts, so as to save the subsequent waiting time for the injection control circuit to reach a safe state, thereby improving the subsequent factory delivery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of a fuel injection control circuit according to an embodiment of the present invention;

[0027] Figure 2a It is a schematic diagram of a part of the internal connection structure between modules in the FSVC chip in the fuel injection control circuit of an embodiment of the present invention;

[0028] Figure 2b It is a schematic diagram of a part of the internal connection structure between modules in the FSVC chip in the fuel injection control circuit of an embodiment of the present invention;

[0029] Figure 3 This is a waveform diagram obtained by simulation during the operation of the fuel injection control circuit of the embodiment of the present invention;

[0030] Figure 4a and Figure 4b This is a waveform diagram obtained by simulation during a high temperature test of the fuel injection control circuit of an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of a test system for a fuel injection control circuit according to an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of a connection port between a fuel injection control circuit and a voltage monitoring module according to an embodiment of the present invention;

[0033] Figure 7a The waveform diagram of the signals at the collection port and the power supply port obtained by simulation during a discharge process of an embodiment of the present invention;

[0034] Figure 7b The waveform diagram of the signals at the collection port and the power supply port obtained by simulation during a discharge process of an embodiment of the present invention;

[0035] Figure 8 The waveform diagram of the VBAT (PT1) signal and the PTIGN2 signal obtained by simulation in an embodiment of the present invention;

[0036] Figure 9a and Figure 9b The CPK test result of the voltage monitoring module of the embodiment of the present invention;

[0037] Fig.10 is a flow chart of a method for testing a fuel injection control circuit according to an embodiment of the present invention;

[0038] Fig.11 It is a flow chart of the step of determining whether the fuel injection control circuit is in a safe state based on a voltage value in a method for testing the fuel injection control circuit according to an embodiment of the present invention;

[0039] Fig.12 A signal timing diagram of a test process of a fuel injection control circuit according to an embodiment of the present invention;

[0040] Fig.13A flow chart of a method for testing a fuel injection control circuit according to another embodiment of the present invention;

[0041] Fig.14 A signal timing diagram of a test process of a fuel injection control circuit according to another embodiment of the present invention;

[0042] Fig.15 is a schematic diagram of a test control device according to an embodiment of the present invention;

[0043] Fig.16 Schematic diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0045] At present, the fuel injection control devices (Electronic Control Unit, ECU) containing fuel injection control circuits in mass production have many defective products with burning problems, both in engineering and in the market. However, the root cause of the burning has not been found, and the burning problem cannot be solved. Therefore, how to solve the burning problem of the fuel injection control circuit in the fuel injection control device has become an urgent problem to be solved.

[0046] First, the circuit structure of the fuel injection control circuit involved in the embodiments of the present application is introduced, wherein the fuel injection control circuit can be used for fuel injection control of a vehicle engine to control the fuel injection of a fuel injector at the engine.

[0047] like Figure 1 As shown, the fuel injection control circuit 10 may include a boost drive unit 11, a high-side drive unit 12 and a low-side drive unit 13, wherein each unit includes a fast solenoid valve controller (FSVC). The FSVC chip and the corresponding peripheral circuits are briefly described below.

[0048] Specifically, the FSVC chip can be divided into a boost drive module, a high-side drive module and a low-side drive module according to the port function. The boost drive unit 11 may include a boost drive module and a corresponding peripheral circuit. The peripheral circuit is hereinafter referred to as the boost drive circuit. The boost drive circuit may include a boost MOSFET. The high-side drive unit 12 may include a high-side drive module and a corresponding peripheral circuit. The peripheral circuit is hereinafter referred to as the high-side drive circuit. The high-side drive circuit includes a high-side drive MOSFET. The low-side drive unit 13 may include a low-side drive module and a corresponding peripheral circuit. The peripheral circuit is hereinafter referred to as the low-side drive circuit. The low-side drive circuit may include a low-side drive MOSFET. The other electrical components and specific circuit structures in the injection control circuit 10 can be referred to. Figure 1 , which will not be explained one by one here.

[0049] The following introduces the various ports and power supply signals in the injection control circuit 10. PTIGN2 is the power supply port of the injection control circuit 10, which is used to input the power supply signal. The VBAT (PT1) signal is the power supply signal provided by the power supply PTIGN2. The FSVC chip can use the corresponding port of VBAT (PT1) to connect to the power supply through the relay Power Train Relay. The relay Power Train Relay can be controlled to turn on / off by the in-vehicle application software. The VCC5 signal is the internal logic power supply signal generated by the power IC according to the power supply signal input from the power supply port PTIGN2, which is used to power the internal logic of the FSVC chip, which is controlled by the in-vehicle application software and the ignition switch. The VDRV signal is the drive signal output by the low-side drive module G_LS port, which is used to power the low-side drive MOS tube in the low-side drive circuit to control the conduction or cutoff of the low-side drive MOS tube.

[0050] like Figure 2a and Figure 2b As shown, Figure 2a and Figure 2b It is part of the internal connection structure between the modules in the FSVC chip. Figure 2a It can be seen that the low-side driver module outputs the VDRV signal through the G_LS port to drive the low-side driver MOS tube to turn on. Figure 2bIt can be seen that the VDRV signal is a driving signal provided by the VBAT (PT1) signal, and the HRESET signal generated by the HRESET pin of the FSVC chip can be used to activate the VDRV signal, that is, when the HRESET signal changes from a low level to a high level, the VDRV signal changes from a low level to a high level and maintains a high level; when the HRESET signal changes from a high level to a low level, the VDRV signal is slowly discharged from a high level to a low level and maintains a low level due to the built-in parasitic capacitor (not shown in the figure) in the low-side driver module of the FSVC chip and the loop capacitor in the low-side driver circuit.

[0051] Combine the following Figure 3 The waveform diagram obtained by simulation during the operation of the fuel injection control circuit 10 shown in the figure briefly describes the working principle of the fuel injection control circuit 10. Since the direct injection system in the cylinder of the engine requires a large pressure to atomize the fuel, the startup moment of the fuel injection control circuit 10 requires a large voltage and a large current. Therefore, when starting the fuel injection control circuit 10, the relay Power Train Relay is first controlled to open the power supply path between the power supply and the power supply port PTIGN2 of the FSVC chip, and the boost drive unit 11 works to boost the power supply signal to about 65V, thereby turning on the boost MOS tube and the low-side drive MOS tube, so that the fuel injection control circuit 10 enters the working state. When the fuel injection control circuit 10 is working normally, the fuel injection control circuit 10 can turn off the boost drive unit 11, switch to the high-side drive unit 12 to work, use the power supply of about 12V to supply power normally, turn on the high-side drive MOS tube and the low-side drive MOS tube to maintain the normal working state of the fuel injection control circuit 10. When the injection control circuit 10 is turned off, the control relay Power Train Relay disconnects the power supply path between the power supply and the power supply port PTIGN2 of the FSVC chip, thereby turning off the high-side driving MOS tube and the low-side driving MOS tube.

[0052] In order to solve the burning problem of the injection control circuit 10, the applicant has found through extensive research and experiments that the fundamental reason for the burning of components in the injection control circuit 10 is the half-on phenomenon of the low-side drive MOS tube.

[0053] The applicant conducted high temperature testing on the damaged products according to the current test method and obtained the following results through simulation: Figure 4a and Figure 4b The waveform shown in Figure 2 is Figure 4a and Figure 4bIt can be seen that the Power Train Relay changes from a low level to a high level, that is, the Power Train Relay is disconnected, the power supply is turned off, the voltage of the VBAT (PT1) signal starts to drop from a high level of 12.4V, and the voltage of the VDRV signal starts to drop from 6.2V. When the voltage of the VBAT (PT1) signal drops to 5.9V, the voltage of the VDRV signal drops to 5.7V. Then the voltage of the VBAT (PT1) signal and the voltage of the VDRV signal continue to drop. When the voltage of the VBAT (PT1) signal drops to 5.7V, the voltage of the VDRV signal drops to 5.3V. At this time, the VCC5 signal changes from a high level to a low level (that is, the VCC5 signal is turned off), and the HRESET signal also changes from a high level to a low level signal. Due to the built-in parasitic capacitor in the low-side driver module and the loop capacitor in the low-side driver circuit, the VDRV signal slowly discharges from 5.3V to 3.7V, and then performs high temperature detection. At this time, the high-side drive MOSFET and the low-side drive MOSFET of the FSVC chip were mistakenly half-turned on, and a 1.4A current flowed through the injector loop load. After about 1.8ms, a large current of about 22A flowed through the loop, causing the high-side drive MOSFET, the low-side drive MOSFET and the load injector loop to burn out.

[0054] It can be analyzed from the above simulation test results that during the power-off process of the injection control circuit, the voltage values ​​of the VDRV signal and the VBAT (PT1) signal during the discharge process are similar. Since the VDRV signal discharges slowly, the voltage of 3.7V at that time exceeds the minimum conduction threshold VGth of the low-side driver MOS tube, which is generally 1V. As a result, the low-side driver MOS tube is mistakenly triggered to be half-conducted, causing the D_LS signal on the low side of the injector loop to be directly conducted to the ground through the low-side driver MOS tube, thereby instantly forming a large current of 22A, causing the loop to burn out.

[0055] However, during the factory delivery of the fuel injection control circuit, the fuel injection control circuit needs to be tested multiple times, and the fuel injection control circuit may need to be started or shut down in the preparation stage before the test or during the test. However, after the fuel injection control circuit is shut down, that is, after the power supply path between the power supply and the power supply port PTIGN2 of the FSVC chip is disconnected, the voltage of the VDRV signal used to drive the low-side drive MOS tube will slowly drop. If the test operation is started at this time, that is, the path between the fuel injection control circuit and the load (i.e., the injector) is turned on, the low-side drive MOS tube may be misled by the residual voltage of the VDRV signal, resulting in a half-open phenomenon, and a large current is instantly generated in the low-side drive MOS tube, which in turn causes the low-side drive MOS tube, the high-side drive MOS tube and the injector load to be burned.

[0056] In this way, in order to overcome the problem of mis-conduction of the low-side drive MOS tube found in the above study, the applicant has thought of starting the pre-shipment test operation only when the VDRV signal or the VBAT (PT1) signal is completely discharged, that is, the VDRV signal or the VBAT (PT1) signal is less than the minimum conduction threshold of the low-side drive MOS tube, thereby reducing the occurrence of burning and improving the test safety and yield rate of the injection control circuit.

[0057] like Figure 5 As shown, the test system of the fuel injection control circuit of the embodiment of the present invention includes a test control device 51 and a voltage monitoring module 52. The test control device 51 and the fuel injection control circuit ( Figure 5 The ECU shown in the figure is an injection control device including an injection control circuit), and the test control device is used to implement the test method of the injection control circuit in the following embodiment. The test method of the injection control circuit is not described in detail here. The voltage monitoring module is connected to the power supply port PTIGN2 of the injection control circuit and the test control device, which is used to monitor the voltage value at the power supply port PTIGN2 and send it to the test control device, wherein the voltage of the drive signal VDRV received by the low-side drive unit in the injection control circuit is synchronized with the voltage at the power supply port PTIGN2.

[0058] Since the VDRV signal and the VBAT (PT1) signal are signals at the internal pins of the FSVC chip, they cannot be directly monitored through the port connection. Therefore, a voltage monitoring module is set to monitor the voltage value at the power supply port PTIGN2, thereby indirectly realizing the voltage monitoring of the VDRV signal and the VBAT (PT1) signal. Then, the test control device determines whether the VDRV signal is completely discharged based on the voltage value at the power supply port PTIGN2, so that subsequent test operations are performed only when it is determined to be completely discharged, thereby reducing the burnout rate of the injection control circuit during the factory process.

[0059] The feasibility of determining whether the VDRV signal is completely discharged based on the voltage value at the power supply port PTIGN2 by testing the control device is demonstrated below. Since the voltage values ​​of the VDRV signal and the VBAT (PT1) signal after discharge are similar, it is demonstrated that the voltage value at the power supply port PTIGN2 is synchronized with the VBAT (PT1) signal.

[0060] First, if Figure 6 As shown, Figure 6The figure is a schematic diagram of the connection ports between the injection control circuit and the voltage monitoring module, where the VBAT (PT1) signal corresponding port of the FSVC chip is connected to the power supply port PTIGN2 through a pi filter, and the acquisition port (PTIGN2) of the voltage monitoring module is connected to the power supply port PTIGN2, so that the voltage collected by the voltage monitoring module is synchronized with the voltage at the power supply port PTIGN2. The voltage synchronization of the PTIGN2 signal and the VBAT (PT1) signal is verified below.

[0061] In order to verify whether the voltage at the acquisition port of the voltage monitoring module is consistent with the voltage at the power supply port PTIGN2, it is also necessary to confirm that there is a voltage drop caused by wireless beam impedance between the acquisition port and the power supply port PTIGN2. Figure 7a and Figure 7b The simulation results of the collection port and the power supply port PTIGN2 are shown. It can be seen from the simulation results that during the two discharge processes, the voltage at the collection port and the voltage at the power supply port PTIGN2 are the same, confirming that there is no voltage drop caused by the wireless beam impedance between the collection port and the power supply port PTIGN2.

[0062] In order to verify that the pi filter has no effect between the power supply port PTIGN2 and the port corresponding to the VBAT (PT1) signal, a simulation experiment is performed to obtain the following: Figure 8 The waveform simulation results of the VBAT (PT1) signal and the signal at PTIGN2 are shown. By comparing the waveforms of the VBAT (PT1) signal and the signal at PTIGN2, it can be seen that there is no difference in the waveforms of the VBAT (PT1) signal and the signal at PTIGN2, so it is confirmed that the pi filter has no effect between the signal at PTIGN2 and the VBAT (PT1) signal, and the voltages of the VBAT (PT1) signal and the signal at PTIGN2 are synchronized during discharge.

[0063] Furthermore, in order to determine whether the voltage monitoring module is stable and reliable, the complex process capability (CPK) of the voltage monitoring module is tested, and the following results are obtained: Figure 9a and Figure 9b The test results shown in the figure show that, under room temperature conditions, the CPK indexes obtained from the two tests of the voltage monitoring module are 14.85 and 15.29 respectively. The CPK index far exceeds the CPK qualified index of 1.67. The CPK index test of the voltage monitoring module is qualified, indicating that the voltage monitoring results of the voltage monitoring module are stable and reliable and can be used for mass production.

[0064] The test system of the fuel injection control circuit in the above embodiment can monitor the voltage value of the power supply port PTIGN2 of the fuel injection control circuit in real time, and determine whether the VDRV signal is completely discharged based on the voltage value. Subsequent test operations are performed only when it is completely discharged, which can improve the safety of the fuel injection control circuit test and reduce the burnout rate of the fuel injection control circuit.

[0065] The following is a detailed introduction to the test method of the injection control circuit implemented by the test control device.

[0066] like Fig.10 As shown, the test method of the fuel injection control circuit of the embodiment of the present invention includes:

[0067] Step 110: disconnecting the path between the power supply and the power supply port of the fuel injection control circuit, and disconnecting the path between the power supply port and the low-side driving unit in the fuel injection control circuit.

[0068] The path between the power supply and the power supply port PTIGN2 of the fuel injection control circuit is disconnected, that is, the power supply is cut off. At the same time, the path between the power supply port PTIGN2 and the low-side drive unit in the fuel injection control circuit is disconnected, where the path between the power supply port PTIGN2 and the low-side drive unit in the fuel injection control circuit is the above-mentioned Figure 5 The peripheral circuit structure of the test system shown in the figure shows that the LSO1 terminal, LSO2 terminal and power supply port PTIGN2 of the low-side driver unit in the injection control circuit connected by relay OC7 can disconnect the path between the power supply port PTIGN2 and the low-side driver unit in the injection control circuit by controlling the relay OC7 to turn off.

[0069] After extensive research and experiments, the applicant discovered that when the low-side driver module is in the off state, it will output a diagnostic signal with a voltage of about 2.5V for open circuit diagnosis. The diagnostic signal is applied to the power supply port PTIGN2 through the relay OC7 using the PTIGN port of the ECU. Therefore, in order to further avoid the diagnostic signal received at the power supply port PTIGN2 being applied to the low-side driver unit, causing the low-side driver unit to be half-open, the path between the power supply port PTIGN2 and the low-side driver unit in the injection control circuit is disconnected while cutting off the power supply, thereby accurately controlling the voltage input to the low-side driver unit to avoid the half-open phenomenon.

[0070] The voltage of the VDRV signal received by the low-side driving unit is synchronized with the voltage at the power supply port PTIGN2 , which has been introduced in the above embodiment and will not be described in detail here.

[0071] Step 120: Obtain the voltage value at the power supply port monitored by the voltage monitoring module.

[0072] Step 130: Determine whether the fuel injection control circuit is in a safe state based on the voltage value.

[0073] Based on the voltage value, it is determined whether the injection control circuit is in a safe state, where the safe state means that the injection control circuit will not fail when connected to the injector. In other words, based on the voltage value at the power supply port PTIGN2, it is determined whether the VDRV signal is completely discharged, thereby determining whether the low-side drive MOS tube will have a half-open failure.

[0074] Step 140: If the fuel injection control circuit is in a safe state, disconnect the logic power supply path inside the control chip in the fuel injection control circuit, and control the fuel injection control circuit to start executing the test operation.

[0075] If the fuel injection control circuit is in a safe state, the logic power supply path inside the control chip in the fuel injection control circuit is disconnected, and the fuel injection control circuit is controlled to start the test operation. If the fuel injection control circuit is not in a safe state, the test can be stopped, and the fuel injection control circuit can enter the maintenance or scrapping process to avoid burning of the fuel injection control circuit.

[0076] Among them, the logic power supply path inside the control chip in the fuel injection control circuit is the above-mentioned VCC5 signal. When it is monitored that the fuel injection control circuit is in a safe state, that is, when the VDRV signal is low, the VCC5 signal is turned off, thereby avoiding the risk of burning of the high-side drive MOS tube after turning off the VCC5 signal, thereby further ensuring the safety of the fuel injection control circuit.

[0077] In one embodiment, the test control device may store test software. When it is determined that the injection control circuit is in a safe state, the path between the injection control circuit and the injector may be opened, and the test software may be executed to control the injection control circuit to perform corresponding test operations.

[0078] In one embodiment, if Fig.11 As shown, the above step 130 may include:

[0079] Step 131: Compare the voltage value with a preset voltage threshold.

[0080] Step 132: In response to the voltage value being greater than or equal to the preset voltage threshold, determining that the fuel injection control circuit is not in a safe state.

[0081] Step 133: In response to the voltage value being less than a preset voltage threshold, determining that the fuel injection control circuit is in a safe state.

[0082] The preset voltage threshold may be the minimum turn-on voltage value of the low-side drive MOS tube in the low-side drive unit. By comparing the voltage value with the preset voltage threshold, when the voltage value is greater than or equal to the preset voltage threshold, it indicates that the voltage applied to the low-side drive MOS tube at this time can turn on the low-side drive MOS tube, thereby causing a burnout fault, and determining that the injection control circuit is not in a safe state. When the voltage value is less than the preset voltage threshold, it indicates that the voltage applied to the low-side drive MOS tube at this time cannot turn on the low-side drive MOS tube, thereby determining that the injection control circuit is in a safe state.

[0083] This embodiment monitors the voltage value of the power supply port PTIGN2 of the injection control circuit to determine whether the VDRV signal applied to the low-side driving MOS tube is completely discharged, that is, whether the injection control circuit is in a safe state. The test operation is not started until it is determined that the injection control circuit is in a safe state, that is, the injection control circuit will not fail when connected to the injector, thereby avoiding the occurrence of a half-conduction fault of the low-side driving MOS tube, improving the safety of the injection control circuit test, and reducing the damage rate of the injection control circuit.

[0084] In one embodiment, in response to the fact that the fuel injection control circuit does not reach a safe state within a preset standstill time after the power supply is turned off, the test operation on the fuel injection control circuit can be terminated. In other words, after disconnecting the path between the power supply and the power supply port PTIGN2 of the fuel injection control circuit, and the path between the power supply port PTIGN2 and the low-side drive unit in the fuel injection control circuit, first wait for a preset standstill time to reserve time for the fuel injection control circuit to enter a safe state, and then after the preset standstill time, determine whether the fuel injection control circuit is in a safe state based on the voltage value. If the fuel injection control circuit does not reach a safe state after waiting for the preset standstill time, it means that other faults occur inside the fuel injection control circuit. If the test operation on the fuel injection control circuit is performed at this time, there may be a risk of burning, so the test operation on the fuel injection control circuit is terminated. If the fuel injection control circuit reaches a safe state, the logic power supply path inside the control chip in the fuel injection control circuit is disconnected, that is, the VCC5 signal is disconnected, and the test operation on the fuel injection control circuit is started.

[0085] It is understandable that the preset standing time can be set according to actual conditions, and is generally longer than the time set by other test methods, such as 5s, which is not limited here.

[0086] In one embodiment, after a preset idle time from the disconnection of the power supply, the step of obtaining the voltage value at the power supply port PTIGN2 monitored by the voltage monitoring module and determining whether the fuel injection control circuit is in a safe state based on the voltage value can be performed. If the fuel injection control circuit is not in a safe state, the test operation on the fuel injection control circuit is terminated. If the fuel injection control circuit is in a safe state, the logic power supply path inside the control chip in the fuel injection control circuit is disconnected, that is, the VCC5 signal is disconnected, and the fuel injection control circuit is controlled to start the test operation.

[0087] In other words, the voltage monitoring module can monitor the real-time voltage value at the power supply port PTIGN2 in real time. During the preset standstill time after disconnecting the path between the power supply and the power supply port PTIGN2 of the injection control circuit, and the path between the power supply port PTIGN2 and the low-side driver unit in the injection control circuit, it can determine in real time whether the injection control circuit is in a safe state based on the real-time voltage value. If the injection control circuit enters a safe state within the preset standstill time, the logic power supply path inside the control chip in the injection control circuit is immediately disconnected, and the injection control circuit is controlled to start the test operation. If the injection control circuit still has not entered the safe state after the preset standstill time, the test operation on the injection control circuit is terminated.

[0088] It is understandable that the preset static time can be set according to actual conditions, and is generally longer than the time set by other test methods, such as 5s, which is not limited here.

[0089] The test operation performed on the injection control circuit may include at least one test task. In one embodiment, the test operation may include at least a key cycle test task, an input / output test task, an injector test task, and a dynamic data (Traceability) test task that are performed in sequence. The number, order, and type of specific test tasks can be set according to actual needs and are not limited here.

[0090] In one embodiment, after the fuel injection control circuit is controlled to perform all test tasks, a test result may be generated. Then, based on the test result, it is determined whether the fuel injection control circuit is qualified. If the fuel injection control circuit is qualified, the fuel injection control circuit enters the factory delivery process. If the fuel injection control circuit is unqualified, the fuel injection control circuit enters the maintenance or scrapping process.

[0091] In one embodiment, after the test is completed or before the test results are generated, the path between the power supply and the power supply port PTIGN2 can be disconnected, and the path between the power supply port PTIGN2 and the low-side driver unit can be disconnected at the same time, and then the voltage value at the power supply port PTIGN2 monitored by the voltage monitoring module is obtained. Based on the voltage value, it is determined whether the injection control circuit is in a safe state. In response to the injection control circuit being in a safe state, the logic power supply path inside the control chip in the injection control circuit is disconnected, that is, the VCC5 signal is disconnected, and the above steps of generating the test results are performed.

[0092] In other words, there are two power-off operations in the test process of the fuel injection control circuit before it leaves the factory, and after the two power-off operations, the voltage monitoring and safety state determination operations shown in steps 120 to 140 in the above embodiment are performed to prevent the fuel injection control circuit from burning during the test process, and the above steps 120 to 140 are not described in detail here. Among them, the first power-off operation is performed before the test, corresponding to step 110 in the above embodiment, and the second power-off operation is performed after the test is completed.

[0093] like Fig.12 As shown, Fig.12 FIG. 1 is a signal timing diagram of a test process of a fuel injection control circuit in an embodiment. Fig.12 In the test, the high level of the signal is turned on, the low level is turned off, the Power Train Relay signal refers to the power signal, OC7 refers to the path between the power supply port PTIGN2 and the low-side driver unit in the injection control circuit, T1+T2 is the preset static time, and T1 is the reserved time in the conventional test method. Fig.12 The timing diagram shown is used to illustrate the test method in the above embodiment.

[0094] After the first power-off operation, after the discharge of T1 time, the VDRV signal drops to 5.7V, and the VBAT (PT1) signal drops to 5.3V, which is still higher than the minimum conduction threshold VGth of the low-side drive MOS tube. After the discharge of T2 time, the VDRV signal and the VBAT (PT1) signal both drop to below the minimum conduction threshold VGth of the low-side drive MOS tube, and the injection control circuit enters a safe state. Therefore, the VCC5 signal is disconnected and subsequent test operations are started. After all test tasks are completed, the second power-off operation is performed. After waiting for T1+T2 time to discharge, the VDRV signal and the VBAT (PT1) signal drop again to below the minimum conduction threshold VGth of the low-side drive MOS tube. Among them, if the test task does not require it, the relay OC7 can remain disconnected during the test task execution stage.

[0095] In one embodiment, if Fig.13As shown, the test method of the fuel injection control circuit may also include:

[0096] Step 210: Determine whether the remaining unexecuted test tasks in the test operation require starting the injection control circuit.

[0097] Step 220: If the remaining unexecuted test tasks in the test operation do not need to start the injection control circuit, then at any time in the time period between the start time of the remaining first test task and the start time of the remaining last test task, the path between the power supply and the power supply port is disconnected, and the path between the power supply port and the low-side drive unit is disconnected at the same time.

[0098] Determine whether the remaining unexecuted test tasks in the test operation need to start the injection control circuit. If the remaining unexecuted test tasks in the test operation do not need to start the injection control circuit, then at any time in the time period between the start time of the remaining first test task and the start time of the remaining last test task, disconnect the path between the power supply and the power supply port PTIGN2, and at the same time disconnect the path between the power supply port PTIGN2 and the low-side driver unit. When the subsequent test tasks do not need to be powered on, such as Traceability testing, the path between the power supply port PTIGN2 and the low-side driver unit can be disconnected at any time after the current test task ends and before the subsequent test tasks start, so as to save the subsequent waiting time for the injection control circuit to reach a safe state, thereby improving the subsequent factory delivery efficiency.

[0099] Step 230: After the fuel injection control circuit is controlled to execute all test tasks, the voltage value at the power supply port monitored by the voltage monitoring module is obtained.

[0100] Step 240: Determine whether the fuel injection control circuit is in a safe state based on the voltage value.

[0101] Step 250: In response to the fuel injection control circuit being in a safe state, disconnecting the logic power supply path inside the control chip in the fuel injection control circuit, and executing the step of generating a test result.

[0102] like Fig.14 As shown, Fig.14 This is a signal timing diagram of the test process of the fuel injection control circuit under another embodiment. Fig.14 The timing diagram shown is used to illustrate the test method in the above embodiment.

[0103] After the first power-off operation, after the discharge of T1+T2 time, the VDRV signal and the VBAT (PT1) signal both drop to below the minimum conduction threshold VGth of the low-side drive MOS tube, and the injection control circuit enters a safe state. Thus, the VCC5 signal is disconnected and subsequent test operations are started. Among them, at the same time as the last executed Traceability test task starts, the path between the power supply port PTIGN2 and the low-side drive unit is disconnected. Then, after all test tasks are completed, the second power-off operation is performed. At this time, it is only necessary to wait for the discharge of T2 time, and the VDRV signal and the VBAT (PT1) signal can drop again below the minimum conduction threshold VGth of the low-side drive MOS tube, thereby saving the subsequent waiting time for the injection control circuit to reach a safe state and improving factory efficiency.

[0104] In one embodiment, it is also possible to determine whether the fuel injection control circuit is in the startup state and whether the next test task does not need to start the fuel injection control circuit each time a test task is completed. If the fuel injection control circuit is in the startup state and the next test task does not need to start the fuel injection control circuit, the path between the power supply and the power supply port PTIGN2 can be disconnected before the next test task starts, and the path between the power supply port PTIGN2 and the low-side drive unit can be disconnected at the same time, and then the voltage of the power supply port PTIGN2 obtained by monitoring is obtained, and after determining that the fuel injection control circuit is in a safe state based on the voltage, the logic power supply path inside the control chip in the fuel injection control circuit is disconnected, that is, the VCC5 signal is disconnected, and the fuel injection control circuit is controlled to start the next test task. In this way, it is ensured that the fuel injection control circuit will not be burned during the execution of each test task, so as to further improve the safety of the test.

[0105] like Fig.15 As shown, the test control device 1500 according to the embodiment of the present invention includes a power-off module 1501 , an acquisition module 1502 , a safety state determination module 1503 and a test module 1504 .

[0106] The power-off module 1501 is used to disconnect the path between the power supply and the power supply port of the injection control circuit, and at the same time disconnect the path between the power supply port and the low-side drive unit in the injection control circuit, wherein the voltage of the drive signal received by the low-side drive unit is synchronized with the voltage at the power supply port. The acquisition module 1502 is used to obtain the voltage value at the power supply port monitored by the voltage monitoring module. The safety state determination module 1503 is used to determine whether the injection control circuit is in a safe state based on the voltage value, and the safe state is that the injection control circuit will not fail when connected to the injector. The test module 1504 is used to disconnect the logic power supply path inside the control chip in the injection control circuit when the injection control circuit is in a safe state, and control the injection control circuit to start performing a test operation.

[0107] Specifically, the test control device 1500 may be a device integrating a processor and a memory (ie, a subsequent electronic device).

[0108] An embodiment of the present invention also provides an electronic device, which includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by the processor to implement a test method for the injection control circuit provided in the above method embodiment.

[0109] The memory can be used to store software programs and modules. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs required for functions, etc.; the data storage area can store data created according to the use of the device, etc. In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory can also include a memory controller to provide the processor with access to the memory.

[0110] In a specific embodiment, Fig.16 A schematic diagram of the structure of an electronic device for implementing the embodiment of the present invention is shown. The electronic device may be a computer terminal, a mobile terminal or other device. The electronic device may also participate in forming or include the test control device provided in the embodiment of the present invention.

[0111] like Fig.16 As shown, an embodiment of the present invention provides an electronic device 1600, including: a processor 1601 and a memory 1602, wherein computer program instructions are stored in the memory 1602, wherein when the computer program instructions are executed by the processor, the processor 1601 executes the steps of the test method for the injection control circuit as described in any of the above embodiments.

[0112] Furthermore, if Fig.16 As shown, the electronic device 1600 also includes a network interface 1603 , an input device 1604 , a hard disk 1605 , and a display device 1606 .

[0113] The above-mentioned interfaces and devices can be interconnected through a bus architecture. The bus architecture can be a bus and bridge that can include any number of interconnected buses. Specifically, various circuits of one or more central processing units (CPUs) represented by processor 1601 and one or more memories represented by memory 1602 are connected together. The bus architecture can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits together. It can be understood that the bus architecture is used to achieve connection and communication between these components. In addition to the data bus, the bus architecture also includes a power bus, a control bus, and a status signal bus, which are all well known in the art, so they are not described in detail herein.

[0114] The network interface 1603 can be connected to a network (such as the Internet, a local area network, etc.), obtain relevant data from the network, and save it in the hard disk 1605.

[0115] The input device 1604 can receive various instructions input by the operator and send them to the processor 1601 for execution. The input device 1604 can include a keyboard or a pointing device, such as a mouse, a trackball, a touch pad or a touch screen.

[0116] The display device 1606 can display the result obtained by the processor 1601 executing the instruction.

[0117] The memory 1602 is used to store programs and data necessary for the operation of the operating system, as well as data such as intermediate results during the calculation process of the processor 1601.

[0118] It is understood that the memory 1602 in the embodiment of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. The memory 1602 of the apparatus and method described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0119] In some embodiments, the memory 1602 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof: an operating system 16021 and an application 16022 .

[0120] The operating system 16021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., which are used to implement various basic services and process hardware-based tasks. The application 16022 includes various application programs, such as a browser, etc., which are used to implement various application services. The program for implementing the method of the embodiment of the present invention can be included in the application 16022.

[0121] The processor 1601, when calling and executing the application and data stored in the memory 1602, specifically, the program or instruction stored in the application 16022, executes the steps of the test method for the fuel injection control circuit as described in any of the above embodiments.

[0122] The method disclosed in the above embodiment of the present invention can be applied to the processor 1601, or implemented by the processor 1601. The processor 1601 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit in the processor 1601 or the instruction in the form of software. The above processor 1601 can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a readily available programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiment of the present invention can be directly embodied as a hardware decoding processor to be executed, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 1602, and the processor 1601 reads the information in the memory 1602 and completes the steps of the above method in combination with its hardware.

[0123] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), general purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described in the present application or a combination thereof.

[0124] For software implementation, the techniques described herein can be implemented by modules (e.g., procedures, functions, etc.) that perform the functions described herein. The software code can be stored in a memory and executed by a processor. The memory can be implemented in the processor or outside the processor.

[0125] Specifically, the processor 1601 is further configured to read the computer program and execute the steps of the test method for the fuel injection control circuit as described in any of the above embodiments.

[0126] In addition, an embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the processor executes the steps of the test method for the injection control circuit as described in any of the above embodiments.

[0127] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0128] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0129] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform some steps of the sending and receiving method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store program codes.

[0130] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for testing a fuel injection control circuit, characterized in that: A test control device in a test system for a fuel injection control circuit, wherein the test control device is connected to a voltage monitoring module in the test system, and the test method comprises the following steps: Disconnecting the path between the power supply and the power supply port of the fuel injection control circuit, and disconnecting the path between the power supply port and the low-side drive unit in the fuel injection control circuit, wherein the voltage of the drive signal received by the low-side drive unit is synchronized with the voltage at the power supply port; Obtaining the voltage value at the power supply port monitored by the voltage monitoring module; determining whether the fuel injection control circuit is in a safe state based on the voltage value, wherein the safe state is that the fuel injection control circuit does not fail when connected to the fuel injector; If so, the logic power supply path inside the control chip in the fuel injection control circuit is disconnected, and the fuel injection control circuit is controlled to start executing the test operation.

2. The method for testing the fuel injection control circuit according to claim 1, characterized in that: After a preset rest time since the power supply is disconnected, the step of obtaining the voltage value at the power supply port monitored by the voltage monitoring module and determining whether the injection control circuit is in a safe state based on the voltage value is performed.

3. The method for testing the fuel injection control circuit according to claim 2, characterized in that: If the fuel injection control circuit is not in a safe state, the test operation on the fuel injection control circuit is terminated.

4. The method for testing the fuel injection control circuit according to claim 1, characterized in that: The voltage monitoring module is used to monitor the voltage value at the power supply port in real time, and the step of determining whether the fuel injection control circuit is in a safe state based on the voltage value includes: Based on the real-time voltage value at the power supply port, it is determined whether the fuel injection control circuit reaches a safe state within a preset standstill time after the power supply is turned off.

5. The method for testing the fuel injection control circuit according to claim 4, characterized in that: In response to the fuel injection control circuit not reaching a safe state within a preset rest time after the power supply is turned off, the test operation on the fuel injection control circuit is terminated.

6. The method for testing the fuel injection control circuit according to claim 1, characterized in that: The step of determining whether the fuel injection control circuit is in a safe state based on the voltage value comprises: Comparing the voltage value with a preset voltage threshold; In response to the voltage value being greater than or equal to the preset voltage threshold, determining that the fuel injection control circuit is not in a safe state; In response to the voltage value being less than the preset voltage threshold, it is determined that the fuel injection control circuit is in a safe state.

7. The method for testing the fuel injection control circuit according to claim 6, characterized in that: The low-side driving unit includes a low-side driving MOS tube, and the preset voltage threshold is a minimum turn-on voltage value of the low-side driving MOS tube.

8. The method for testing the fuel injection control circuit according to claim 1, characterized in that: The test operation includes at least one test task, and the method further includes: After controlling the fuel injection control circuit to execute all test tasks, generating a test result; Determining whether the fuel injection control circuit is qualified based on the test result; If yes, the fuel injection control circuit enters the factory delivery process; If not, the fuel injection control circuit enters a maintenance or scrapping process.

9. The method for testing the fuel injection control circuit according to claim 8, characterized in that: Before generating the test result, disconnecting the path between the power supply and the power supply port, and disconnecting the path between the power supply port and the low-side drive unit; Obtaining the voltage value at the power supply port monitored by the voltage monitoring module; determining whether the fuel injection control circuit is in a safe state based on the voltage value; In response to the fuel injection control circuit being in a safe state, disconnecting a logic power supply path inside a control chip in the fuel injection control circuit, and executing the step of generating a test result.

10. The method for testing the fuel injection control circuit according to claim 8, characterized in that: The method further comprises: determining whether the remaining unexecuted test tasks in the test operation require starting the fuel injection control circuit; If not, then at any time in the time period between the start time of the first remaining test task and the start time of the last remaining test task, disconnect the path between the power supply and the power supply port, and disconnect the path between the power supply port and the low-side drive unit; Before the step of generating the test result, the method includes: Obtaining the voltage value at the power supply port monitored by the voltage monitoring module; determining whether the fuel injection control circuit is in a safe state based on the voltage value; In response to the fuel injection control circuit being in a safe state, disconnecting a logic power supply path inside a control chip in the fuel injection control circuit, and executing the step of generating a test result.

11. The method for testing the fuel injection control circuit according to claim 1, characterized in that: The test operation at least includes a charge-discharge cycle test task, an input / output test task, a fuel injector test task and a dynamic data test task which are executed in sequence.

12. A test control device, characterized in that: include: A power-off module, used to disconnect the path between the power supply and the power supply port of the fuel injection control circuit, and simultaneously disconnect the path between the power supply port and the low-side drive unit in the fuel injection control circuit, wherein the voltage of the drive signal received by the low-side drive unit is synchronized with the voltage at the power supply port; An acquisition module, used to acquire the voltage value at the power supply port monitored by the voltage monitoring module; a safety state determination module, configured to determine whether the fuel injection control circuit is in a safety state based on the voltage value, wherein the safety state is that the fuel injection control circuit will not fail when connected to the fuel injector; The test module is used to disconnect the logic power supply path inside the control chip in the fuel injection control circuit when the fuel injection control circuit is in a safe state, and control the fuel injection control circuit to start performing a test operation.

13. A test system for a fuel injection control circuit, characterized in that: include: The test control device as claimed in claim 12, connected to the injection control circuit; A voltage monitoring module is connected to the power supply port of the injection control circuit and the test control device, and is used to monitor the voltage value at the power supply port and send it to the test control device.

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