A vehicle fuel injector fault simulation device and method

Abstract

This invention discloses a vehicle fuel injector fault simulation device and method, relating to the testing field of fuel injection devices. The invention's signal simulator receives feedback signals from the engine fuel injector during normal operation. A computer modifies the feedback signal received by the signal simulator and sends this modified signal to an external fuel injector. The external fuel injector operates according to the modified signal and feeds back the signal to the signal simulator. The signal simulator then sends the feedback signal from the external fuel injector to the electronic control unit (ECU) to verify the OBD system's monitoring function of fuel injection quantity, thereby reducing workload without requiring disassembly and reassembly of the engine fuel injector. Simultaneously, the engine fuel injector can receive normal injection signals and operate without affecting engine performance. Furthermore, this invention eliminates the need to repeatedly manufacture deteriorated fuel injector parts, saving time and testing costs. The injection signal can be adjusted as needed, improving the efficiency of OBD system function verification.

Description

Technical Field

[0001] This invention relates to the field of testing fuel injection devices, and in particular to a device and method for simulating fuel injector failures in a vehicle. Background Technology

[0002] With the full implementation of the China VI emission standard for heavy-duty vehicles, On-Board Diagnostics (OBD) plays a crucial role in vehicle emissions monitoring. Verifying the functionality of an OBD system typically involves fault simulation to confirm its proper operation. Fuel injection quantity is a critical parameter for engine operation; its accuracy directly determines the engine's function. Therefore, monitoring fuel injection quantity is a vital aspect of OBD system functionality verification.

[0003] In existing testing protocols, OBD system functional verification for monitoring fuel injection quantity typically involves replacing degraded injector parts. During fault simulation testing, the injectors of the engine to be tested are removed and replaced with pre-prepared degraded injector parts. During fault recovery, the degraded parts are removed and replaced with normal injectors, thus completing the OBD system's functional verification of fuel injection quantity monitoring. However, this method has the following problems:

[0004] 1) Engine injectors are difficult to disassemble and assemble, requiring a lot of work. Improper installation can easily affect engine performance.

[0005] 2) After the defective injector is installed in the vehicle, the cylinder with the defective injector installed cannot work properly during the functional verification process, causing damage to the vehicle engine.

[0006] 3) There are many types of engines, and the corresponding injector types are also different. Since different models of injectors cannot be used interchangeably, different degraded parts need to be produced during the verification of injectors for different vehicles, which is extremely time-consuming and costly. Summary of the Invention

[0007] To address the aforementioned problems in the existing technology, the present invention provides a vehicle injector failure simulation device and method.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] A vehicle injector failure simulation device includes: a signal simulator, an external injector, and a computer;

[0010] The signal simulator is connected to the external fuel injector, the computer, the electronic control unit in the vehicle, and the engine fuel injector in the vehicle; the electronic control unit in the vehicle is connected to the on-board automatic diagnostic system in the vehicle.

[0011] The electronic control unit (ECU) acquires the fuel injection quantity signal from the engine injector and sends it to the signal simulator. The computer generates a signal modification instruction and sends it to the signal simulator. The signal simulator modifies the received fuel injection quantity signal from the engine injector based on the modification instruction and sends the modified signal to the external injector. The external injector operates according to the modified signal and generates a feedback signal. The signal simulator receives the feedback signal from the external injector and sends it to the ECU. The ECU sends the received feedback signal to the vehicle's on-board diagnostic system (OBD) to determine whether the BOD has generated injector fault information, thus verifying the BOD.

[0012] Optionally, the device further includes: a junction box;

[0013] The junction box is connected to both the electronic control unit and the signal simulator.

[0014] Optionally, when connecting the junction box, the rotational speed information and camshaft position information are determined based on the circuit diagram of the electronic control unit.

[0015] Optionally, the fuel injection quantity signal of the engine injector is generated under set operating conditions.

[0016] A method for simulating vehicle injector failure, applied to the aforementioned vehicle injector failure simulation device; the method includes:

[0017] Acquire the fuel injection quantity signal; the fuel injection quantity signal is the fuel injection quantity signal of the engine injector in the vehicle.

[0018] Generate a signal modification instruction, and modify the fuel injection quantity signal based on the signal modification instruction;

[0019] An external fuel injector operates based on the modified fuel injection quantity signal and generates a feedback signal;

[0020] Based on the feedback signal, it is determined whether the on-board automatic diagnostic system generates injector fault information, thereby verifying the on-board automatic diagnostic system.

[0021] Optionally, the fuel injection quantity signal is generated under set operating conditions.

[0022] Optionally, the method further includes:

[0023] Obtain vehicle speed and camshaft position information;

[0024] The fuel injection quantity signal is verified based on the rotational speed information and the camshaft position information.

[0025] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0026] The vehicle injector fault simulation device and method provided by this invention, after engine start-up, the signal simulator sends the received fuel injection quantity signal to the engine injector. The engine injector operates normally according to the fuel injection signal and sends a feedback signal to the signal simulator. Simultaneously, the computer modifies the fuel injection quantity signal received by the signal simulator and sends the modified fuel injection quantity signal to an external injector. The external injector operates according to the modified fuel injection quantity signal and sends a feedback signal to the signal simulator. The signal simulator sends the feedback signal from the external injector to the Electronic Control Unit (ECU) to verify the OBD system's monitoring function of fuel injection quantity, thereby reducing workload without disassembling the engine injector. Furthermore, the engine injector can receive normal fuel injection signals and operate without affecting engine performance. Moreover, this invention eliminates the need to repeatedly manufacture deteriorated injector parts, saving time and testing costs. The fuel injection signal can be adjusted as needed, improving the efficiency of OBD system function verification. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram showing the connection between the vehicle injector fault simulation device provided by the present invention and the vehicle.

[0029] Figure 2 The flowchart is for the vehicle injector fault simulation method provided by the present invention.

[0030] Symbol explanation:

[0031] 1-ECU, 2-Engine injector, 3-Handling box, 4-Voltage regulator, 5-Computer, 6-Signal simulator, 7-External injector. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The purpose of this invention is to provide a vehicle injector failure simulation device and method that eliminates the need to disassemble and reassemble the engine injectors, reducing workload. Simultaneously, the engine injectors can receive normal injection signals and operate without affecting engine performance. Furthermore, this invention eliminates the need to repeatedly manufacture deteriorated injector parts, saving time and testing costs. The injection signals can be adjusted as needed, improving the efficiency of OBD system function verification.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 As shown, the vehicle injector fault simulation device provided by the present invention includes: a signal simulator 6, an external injector 7, and a computer 5 (or a host computer or other intelligent device).

[0036] The signal simulator 6 is connected to the external fuel injector 7, the computer 5, the vehicle's ECU 1, and the vehicle's engine fuel injector 2. The vehicle's ECU 1 is connected to the vehicle's OBD system.

[0037] ECU 1 acquires the fuel injection quantity signal from engine injector 2 and sends it to signal simulator 6. Computer 5 generates a signal modification command and sends it to signal simulator 6. Signal simulator 6 modifies the received fuel injection quantity signal from engine injector 2 based on the command and sends the modified signal to external injector 7. External injector 7 operates according to the modified signal and generates a feedback signal. Signal simulator 6 receives the feedback signal from external injector 7 and sends it to ECU 1. ECU 1 sends the received feedback signal to the vehicle's OBD system to determine if the OBD system has generated injector fault information, thus verifying the OBD system. The fuel injection quantity signal from engine injector 2 is generated under a set operating condition. The set operating condition refers to the trigger condition for a fuel injection quantity fault. When the engine reaches this trigger condition, the OBD system performs a monitoring to determine if a fault exists. Different operating conditions can be set according to different engine manufacturers before fault simulation.

[0038] Furthermore, in order to distribute all circuit signals in the ECU circuit, the device provided by the present invention also includes: a junction box 3.

[0039] Junction box 3 is connected to ECU 1 and signal simulator 6 respectively.

[0040] In this process, junction box 3 is connected to the ECU circuit. Based on the circuit diagram, the corresponding engine speed and camshaft position information are located to verify the fuel injection quantity and other signals from the injectors. Junction box 3 is then connected to signal simulator 6. Signal simulator 6 requires both engine speed and camshaft position information as input to confirm the injection timing, thereby ensuring that the fuel injection quantity signal is correctly sent to the injectors.

[0041] Furthermore, the device provided by the present invention may also include a regulated power supply 4 to provide power to the signal simulator 6. The power supply provided here may be a 24V DC power supply.

[0042] The following embodiment illustrates the process of simulating a vehicle injector fault using the vehicle injector fault simulation device provided above by the present invention. Specifically, the process includes:

[0043] Step 1: Connect junction box 3 to the ECU circuit, find the corresponding speed and camshaft position according to the circuit diagram, verify the fuel injection quantity and other signals of the fuel injector, and connect to the signal simulator 6 through junction box 3.

[0044] Step 2: Start the engine and run the set operating conditions. The ECU sends the fuel injection quantity signal to the signal simulator 6.

[0045] Step 3: The signal simulator 6 sends the received fuel injection quantity signal to the engine injector 2. Simultaneously, the computer 5 controls the signal simulator 6 to modify the waveform of the fuel injection quantity signal from the ECU, and sends the modified error signal to the external injector 7. The external injector 7 operates according to the error message, generating a feedback signal.

[0046] Step 3: The signal simulator 6 simultaneously receives feedback signals from the engine injector 2 and the external injector 7, shields the feedback signal from the engine injector 2, and sends the feedback signal from the external injector 7 to the ECU.

[0047] Step 4: The ECU sends the feedback signal from the external injector 7 to the OBD system to verify whether the vehicle's OBD system can recognize the injector fault information.

[0048] Based on the above description, the vehicle injector failure simulation device provided by the present invention has the following advantages compared with the prior art:

[0049] 1) No need to disassemble the engine injectors to replace deteriorated parts, which reduces workload.

[0050] 2) The engine injectors receive normal fuel injection signals and operate without affecting engine performance.

[0051] 3) No need to repeatedly manufacture deteriorated injector parts, saving testing costs.

[0052] 4) The fuel injection signal can be adjusted as needed to improve the efficiency of fault simulation.

[0053] Furthermore, the present invention also provides a method for simulating vehicle injector failures, applicable to the aforementioned vehicle injector failure simulation device. For example... Figure 2 As shown, this method includes:

[0054] Step 100: Obtain the fuel injection quantity signal. This fuel injection quantity signal is the fuel injection quantity signal of the engine injector in the vehicle, and this fuel injection quantity signal is generated under set operating conditions.

[0055] Step 101: Generate signal modification instructions and modify the fuel injection quantity signal based on the signal modification instructions.

[0056] Step 102: An external fuel injector is used to operate based on the modified fuel injection quantity signal and generate a feedback signal.

[0057] Step 103: Determine whether the OBD system generates injector fault information based on the feedback signal, thereby verifying the OBD system.

[0058] Furthermore, to ensure that the fuel injection quantity signal can be correctly sent to the fuel injector, the method provided by the present invention further includes:

[0059] Obtain vehicle speed and camshaft position information.

[0060] The fuel injection quantity signal is verified based on the rotational speed information and camshaft position information.

[0061] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0062] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A vehicle injector failure simulation device, characterized in that, include: Signal simulator, external fuel injector, computer, and junction box; The signal simulator is connected to the external fuel injector, the computer, the electronic control unit in the vehicle, and the engine fuel injector in the vehicle; the electronic control unit in the vehicle is connected to the on-board automatic diagnostic system in the vehicle. The electronic control unit (ECU) acquires the fuel injection quantity signal from the engine injector and sends it to the signal simulator. The computer generates a signal modification instruction and sends it to the signal simulator. The signal simulator modifies the received fuel injection quantity signal from the engine injector based on the modification instruction and sends the modified signal to the external injector. The external injector operates according to the modified signal and generates a feedback signal. The signal simulator simultaneously receives feedback signals from both the engine injector and the external injector, masks the engine injector's feedback signal, and sends the external injector's feedback signal to the ECU. The ECU sends the received feedback signal to the vehicle's on-board diagnostic system (OBD) to determine whether the BOD is generating injector fault information, thus verifying the BOD. The junction box is connected to the electronic control unit and the signal simulator respectively; when connecting the junction box, the rotational speed information and camshaft position information are determined based on the circuit diagram of the electronic control unit.

2. The vehicle injector failure simulation device according to claim 1, characterized in that, The fuel injection quantity signal of the engine injector is generated under set operating conditions.

3. A method for simulating fuel injector failure in a vehicle, characterized in that, The method is applied to the vehicle injector failure simulation device as described in any one of claims 1-2; the method includes: Acquire the fuel injection quantity signal; the fuel injection quantity signal is the fuel injection quantity signal of the engine injector in the vehicle. Generate a signal modification instruction, and modify the fuel injection quantity signal based on the signal modification instruction; An external fuel injector operates based on the modified fuel injection quantity signal and generates a feedback signal; Based on the feedback signal, it is determined whether the on-board automatic diagnostic system generates injector fault information, thereby verifying the on-board automatic diagnostic system.

4. The method for simulating vehicle injector failure according to claim 3, characterized in that, The fuel injection quantity signal is generated under set operating conditions.

5. The method for simulating vehicle injector failure according to claim 3, characterized in that, The method further includes: Obtain vehicle speed and camshaft position information; The fuel injection quantity signal is verified based on the rotational speed information and the camshaft position information.

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