Fault simulator for gasoline injector of direct injection gasoline engine

Abstract

The utility model discloses a fault simulator of a direct injection gasoline engine injector. Comprising a first fuse F1, a second fuse F2, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first potentiometer R7, a second potentiometer R8, a microcontroller MCU and a first MOS tube Q1. According to the utility model, compared with the prior art, the simulator is utilized to modify the control signal of the oil injector so as to modify the oil injection quantity, so that the real oil injection quantity deviation can be controlled as required, the PVE fault verification requirement of the latest emission regulation is met, and the reliability of the oil injector is improved. The manufacturing cost is low and the operation is simple.

Description

Technical Field

[0001] This utility model relates to the field of automotive testing simulation equipment, specifically to a fuel injector fault simulator for a direct injection gasoline engine. Background Technology

[0002] During the later stages of gasoline engine development and after mass production, when conducting Productive Experience (PVE) verification to meet the China VI emission standards, injector injection quantity deviation fault verification is required. The purpose of this verification test is to verify whether the vehicle's Engine Control Module (ECM) can detect the fault and report the relevant fault code when an injector injection quantity deviation fault occurs. Traditional fault simulation methods include: Method 1 involves lowering the injection quantity deviation fault threshold using software during the calibration phase. Even if the injection quantity is normal, the lowered threshold will still trigger a fault report, thus inferring that the ECM can detect and report the fault code when the actual injection quantity deviation is abnormal. However, this software method of adjusting the fault threshold cannot simulate actual fault conditions and is only suitable for the development phase. After mass production, when conducting PVE verification to meet the China VI emission standards, the traditional software method of lowering the fault threshold is prohibited. Method 2 involves manufacturing injectors with injection quantity deviation faults and installing these faulty injectors on the engine to simulate the fault. However, this method requires manufacturing a large number of faulty injectors of different brands, models, and deviations. When simulating faults, it is necessary to repeatedly disassemble and reassemble faulty injectors of different deviation levels for different cylinders. This method has disadvantages such as high manufacturing cost, high operation difficulty, and long testing cycle.

[0003] In summary, the main problems with traditional methods are as follows:

[0004] 1. When simulating faults using software testing, the actual fuel injection quantity deviation of the injectors is within the normal range. The fuel injection quantity deviation received by the vehicle's engine control module (ECM) is also normal.

[0005] 2. The engine is not actually faulty; the fault is only reported when the fault threshold is lowered below the normal range. Software methods cannot simulate real-world fuel injection deviation faults. This approach is only applicable during the research and development phase.

[0006] 3. The China VI emission standard regulations prohibit the use of software methods to adjust fault thresholds during PVE verification in the mass production stage of vehicles.

[0007] 4. If an injector with a fuel injection quantity deviation fault is used to simulate the fault, the manufacturing cost is high, the operation is difficult, and the testing cycle is long.

[0008] To address the aforementioned issues, we have made a series of improvements. Utility Model Content

[0009] The purpose of this invention is to provide a simulator for injector failure in a direct-injection gasoline engine, so as to overcome the above-mentioned shortcomings and deficiencies of the prior art.

[0010] A fuel injector fault simulator for a direct-injection gasoline engine includes: a first fuse F1, a second fuse F2, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first potentiometer R7, a second potentiometer R8, a microcontroller MCU, a first MOSFET Q1, a second MOSFET Q2, a third MOSFET Q3, a first socket J1, a second socket J2, a third socket J3, and a fourth socket J4. The system includes sockets J4, J5, J6, and J7. Socket J1 is connected to one end of fuse F1, and the other end of fuse F1 is connected to the anode of diode D1. The cathode of diode D1 is connected to the positive terminal of the microcontroller (MCU). A fixed terminal of potentiometer R8 is connected to a signal input terminal of the MCU. One end of resistors R1 and R2 is connected to the gate of MOSFET Q1, and the other end of R2 is connected to the first control stage of the MCU. Resistors R3 and R4 are also connected. One end of resistor R4 is connected to the gate of the second MOSFET Q2. The other end of resistor R4 is connected to the second control stage of the microcontroller MCU. One end of the fifth resistor R5 and the sixth resistor R6 are connected to the gate of the third MOSFET Q3. The other end of the sixth resistor R6 is connected to the third control stage of the microcontroller MCU. The drain of the first MOSFET Q1 is connected to one end of the first capacitor C1 and the third socket J3. The drain of the second MOSFET Q2 is connected to the sixth socket J6, one end of the third capacitor C3, and one fixed end of the first potentiometer R7. The other fixed end of the first potentiometer R7 is connected to one fixed end of the fourth capacitor C4. The first potentiometer R7 is connected to the seventh socket J7. The movable terminal of the first potentiometer R7 is connected to another signal input terminal of the microcontroller MCU. The fifth socket J5 is connected to one end of the second fuse F2. The other end of the second fuse F2 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the drain of the third MOSFET Q3. The source of the third MOSFET Q3 is connected to the other end of the fifth resistor R5 and the anode of the third diode D3. The cathode of the third diode D3, the source of the second MOSFET Q2, the other end of the third resistor R3, the cathode of the fourth diode D4, one end of the second capacitor C2, and the fourth socket J4 are connected.The negative terminal of the microcontroller (MCU), the other fixed terminal of the second potentiometer R8, the other end of the first resistor R1, the source of the first MOSFET Q1, the other end of the first capacitor C1, the anode of the fourth diode D4, the other end of the second capacitor C2, the other end of the third capacitor C3, the other end of the fourth capacitor C4, and the second socket J2 are connected to ground. The socket J1 is connected to the 5V power supply of the vehicle engine control module (ECM). The socket J2 is connected to the negative terminal of the vehicle's 12V power supply. The socket J3 is connected to the negative terminal of the engine injector. The socket J4 is connected to the positive terminal of the engine injector. The socket J5 is connected to the positive terminal of the vehicle's 12V power supply. The socket J6 is connected to the positive terminal of the ECM injector control. The socket J7 is connected to the negative terminal of the ECM injector control.

[0011] The beneficial effects of this utility model are:

[0012] Compared with traditional technologies, this invention uses a simulator to modify the injector control signal and thus the injection quantity, enabling on-demand control of the actual injection quantity deviation, meeting the PVE fault verification requirements of the latest emission regulations, and is low in manufacturing cost and simple to operate. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure label:

[0015] First fuse F1100, second fuse F2200, first diode D1300, second diode D2400, third diode D3500, fourth diode D4600, first capacitor C1700, second capacitor C2800, third capacitor C3900, fourth capacitor C41000, first resistor R11100, second resistor R21200, third resistor R31300, fourth resistor R41400, fifth resistor R51500, sixth resistor R61600, first potentiometer R71700, second potentiometer R81800, microcontroller MCU 1900, first MOSFET Q12000, second MOSFET Q22100, third MOSFET Q32200, first socket J12300, second socket J22400, third socket J32500, fourth socket J42600, fifth socket J52700, sixth socket J62800 and seventh socket J72900. Detailed Implementation

[0016] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0017] Example 1

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] like Figure 1As shown. A fuel injector fault simulator for a direct-injection gasoline engine includes: a first fuse F1100, a second fuse F2200, a first diode D1300, a second diode D2400, a third diode D3500, a fourth diode D4600, a first capacitor C1700, a second capacitor C2800, a third capacitor C3900, a fourth capacitor C41000, a first resistor R11100, a second resistor R21200, a third resistor R31300, a fourth resistor R41400, a fifth resistor R51500, a sixth resistor R61600, a first potentiometer R71700, a second potentiometer R81800, and a microcontroller (MCU). 1900, first MOSFET Q12000, second MOSFET Q22100, third MOSFET Q32200, first socket J12300, second socket J22400, third socket J32500, fourth socket J42600, fifth socket J52700, sixth socket J62800, and seventh socket J72900. First socket J12300 is connected to one end of first fuse F1100. The other end of first fuse F1100 is connected to the anode of first diode D1300. The cathode of first diode D1300 is connected to the positive terminal of microcontroller MCU 1900 and a fixed terminal of second potentiometer R81800. The movable terminal of second potentiometer R81800 is connected to the microcontroller MCU. One signal input terminal of the MCU 1900 is connected. One end of the first resistor R11100 and the second resistor R21200 are connected to the gate of the first MOSFET Q12000. The other end of the second resistor R21200 is connected to the first control stage of the microcontroller MCU 1900. One end of the third resistor R31300 and the fourth resistor R41400 are connected to the gate of the second MOSFET Q22100. The other end of the fourth resistor R41400 is connected to the second control stage of the microcontroller MCU 1900. One end of the fifth resistor R51500 and the sixth resistor R61600 are connected to the gate of the third MOSFET Q32200. The other end of the sixth resistor R61600 is connected to the microcontroller MCU 1900. In the third control stage connection of the 1900, the drain of the first MOSFET Q12000 is connected to one end of the first capacitor C1700 and the third socket J32500. The drain of the second MOSFET Q22100 is connected to the sixth socket J62800, one end of the third capacitor C3900, and one fixed end of the first potentiometer R71700. The other fixed end of the first potentiometer R71700 is connected to one end of the fourth capacitor C41000 and the seventh socket J72900. The movable end of the first potentiometer R71700 is connected to another signal input terminal of the microcontroller MCU 1900. The fifth socket J52700 is connected to one end of the second fuse F2200.The other end of the second fuse F2200 is connected to the anode of the second diode D2400. The cathode of the second diode D2400 is connected to the drain of the third MOSFET Q32200. The source of the third MOSFET Q32200 is connected to the other end of the fifth resistor R51500 and the anode of the third diode D3500. The cathode of the third diode D3500, the source of the second MOSFET Q22100, the other end of the third resistor R31300, the cathode of the fourth diode D4600, one end of the second capacitor C2800, and the fourth socket J42600 are connected. The microcontroller MCU... The negative terminal of 1900, the other fixed terminal of the second potentiometer R81800, the other end of the first resistor R11100, the source of the first MOSFET Q12000, the other end of the first capacitor C1700, the anode of the fourth diode D4600, the other end of the second capacitor C2800, the other end of the third capacitor C3900, the other end of the fourth capacitor C41000, and the second socket J22400 are connected to ground. The socket J12300 is connected to the 5V power supply of the vehicle engine control module (ECM). The power supply connections are as follows: the second socket J22400 is connected to the negative terminal of the vehicle's 12V power supply; the third socket J32500 is connected to the negative terminal of the engine injector; the fourth socket J42600 is connected to the positive terminal of the engine injector; the fifth socket J52700 is connected to the positive terminal of the vehicle's 12V power supply; the sixth socket J62800 is connected to the positive terminal of the vehicle's engine control module (ECM) injector control; and the seventh socket J72900 is connected to the negative terminal of the vehicle's engine control module (ECM) injector control.

[0020] The principle of this invention is as follows: The 5V power supply of the vehicle engine control module (ECM) powers the entire circuit through the first fuse F1100 and the first diode D1300. The positive terminal of the vehicle's 12V power supply provides 12V power to the drain of the third MOSFET Q32200 through the fifth socket J52700, the second fuse F2200, and the second diode D2400. The negative terminal of the vehicle's 12V power supply provides a negative circuit for the entire simulator through the second socket J22400.

[0021] The first fuse F1100 provides overcurrent protection for the 5V circuit, and the first diode D1300 provides reverse connection protection for the 5V circuit. The second fuse F2200 provides overcurrent protection for the 12V circuit, and the second diode D2400 provides reverse connection protection for the 12V circuit.

[0022] The third diode D3500 and the fourth diode D4600 are used to protect the 12V and 5V circuits. The first capacitor C1700, the second capacitor C2800, the third capacitor C3900, and the fourth capacitor C41000 are used to absorb interference signals.

[0023] During a simulated fault, rotating the second potentiometer R81800 outputs a 0-5V voltage at its movable terminal, which serves as the fuel injection quantity deviation demand signal for the microcontroller MCU 1900. The original fuel injection quantity control signal from the vehicle engine control module (ECM) is input through the sixth connector J62800 and the seventh connector J72900, and then attenuated by the first potentiometer R71700 before being supplied to the microcontroller MCU 1900.

[0024] The microcontroller MCU 1900 adjusts the original fuel injection quantity signal according to the setting of the second potentiometer R81800. The adjusted signal is amplified by the first MOSFET Q12000, the second MOSFET Q22100 and the third MOSFET Q32200 and then connected to the third socket J32500 and the fourth socket J42600. The third socket J32500 and the fourth socket J42600 output control signals with fuel injection quantity deviation to the engine injector to realize fuel injection control according to the deviation preset by the second potentiometer R81800.

[0025] When the second potentiometer R81800 is adjusted, and the fuel injection quantity deviation setting exceeds the fault threshold, the vehicle engine control module (ECM) detects the fault and reports the relevant fault code.

[0026] Compared with traditional technologies, this invention uses a simulator to modify the injector control signal and thus the injection quantity, enabling on-demand control of the actual injection quantity deviation, meeting the PVE fault verification requirements of the latest emission regulations, and is low in manufacturing cost and simple to operate.

[0027] The specific embodiments of this utility model have been described above, but this utility model is not limited thereto. Various changes can be made to this utility model as long as they do not depart from its spirit.

Claims

1. A fuel injector fault simulator for a gasoline direct injection engine, characterized in that, Comprising: The first fuse F1 (100), the second fuse F2 (200), the first diode D1 (300), the second diode D2 (400), the third diode D3 (500), the fourth diode D4 (600), the first capacitor C1 (700), the second capacitor C2 (800), the third capacitor C3 (900), the fourth capacitor C4 (1000), the first resistor R1 (1100), the second resistor R2 (1200), the third resistor R3 (1300), the fourth resistor R4 (1400), the fifth resistor R5 (1500), the sixth resistor R6 (1600), the first potentiometer R7 (1700), the second potentiometer R8 (1800), the microcontroller MCU (1900), the first MOS Q1 (2000), the second MOS Q2 (2100), the third MOS Q3 (2200), the first socket J1 (2300), the second socket J2 (2400), the third socket J3 (2500), the fourth socket J4 (2600), the fifth socket J5 (2700), the sixth socket J6 (2800), and the seventh socket J7 (2900), the first socket J1 (2300) is connected with one end of the first fuse F1 (100), the other end of the first fuse F1 (100) is connected with the anode of the first diode D1 (300), the cathode of the first diode D1 (300) is connected with the positive electrode of the microcontroller MCU (1900) and one fixed end of the second potentiometer R8 (1800), the movable end of the second potentiometer R8 (1800) is connected with one signal input end of the microcontroller MCU (1900), one end of the first resistor R1 (1100) and the second resistor R2 (1200) is connected with the gate of the first MOS Q1 (2000), the other end of the second resistor R2 (1200) is connected with the first control level of the microcontroller MCU (1900), one end of the third resistor R3 (1300) and the fourth resistor R4 (1400) is connected with the gate of the second MOS Q2 (2100), the other end of the fourth resistor R4 (1400) is connected with the second control level of the microcontroller MCU (1900), one end of the fifth resistor R5 (1500) and the sixth resistor R6 (1600) is connected with the gate of the third MOS Q3 (2200), the other end of the sixth resistor R6 (1600) is connected with the third control level of the microcontroller MCU (1900), the drain of the first MOS Q1 (2000) is connected with one end of the first capacitor C1 (700) and the third socket J3 (2500), the drain of the second MOS Q2 (2100) is connected with the sixth socket J6 (2800), one end of the third capacitor C3 (900) and one fixed end of the first potentiometer R7 (1700),The other fixed end of the first potentiometer R7 (1700) is connected with one end of the fourth capacitor C4 (1000) and the seventh socket J7 (2900), the movable end of the first potentiometer R7 (1700) is connected with another signal input end of the microcontroller MCU (1900), the fifth socket J5 (2700) is connected with one end of the second fuse F2 (200), the other end of the second fuse F2 (200) is connected with the anode of the second diode D2 (400), the cathode of the second diode D2 (400) is connected with the drain of the third MOS tube Q3 (2200), the source of the third MOS tube Q3 (2200) is connected with the other end of the fifth resistor R5 (1500) and the anode of the third diode D3 (500), the cathode of the third diode D3 (500), the source of the second MOS tube Q2 (2100), the other end of the third resistor R3 (1300), the cathode of the fourth diode D4 (600), one end of the second capacitor C2 (800) and the fourth socket J4 (2600) are connected, the negative electrode of the microcontroller MCU (1900), the other fixed end of the second potentiometer R8 (1800), the other end of the first resistor R1 (1100), the source of the first MOS tube Q1 (2000), the other end of the first capacitor C1 (700), the anode of the fourth diode D4 (600), the other end of the second capacitor C2 (800), the other end of the third capacitor C3 (900), the other end of the fourth capacitor C4 (1000) and the second socket J2 (2400) are connected with the ground, the jack of the first socket J1 (2300) is connected with the 5V power supply of the vehicle engine control module ECM, the jack of the second socket J2 (2400) is connected with the negative electrode of the vehicle 12V power supply, the jack of the third socket J3 (2500) is connected with the negative terminal of the engine injector, the jack of the fourth socket J4 (2600) is connected with the positive terminal of the engine injector, the jack of the fifth socket J5 (2700) is connected with the positive electrode of the vehicle 12V power supply, the jack of the sixth socket J6 (2800) is connected with the positive terminal of the injector control of the vehicle engine control module ECM, the jack of the seventh socket J7 (2900) is connected with the negative terminal of the injector control of the vehicle engine control module ECM.

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