Phase fault simulator for camshaft of gasoline engine

Abstract

A gasoline engine camshaft phase fault simulator comprises a 5V battery, a fuse F1, a switch S1, a diode D1, a potentiometer R1, a first resistor R2, a second resistor R3, a first capacitor C1, a second capacitor C2, a microcontroller MCU, an MOS tube Q1, a first socket J1, a second socket J2 and a photoelectric coupler U1. Compared with the prior art, the CMP signal phase fault simulator is composed of common electronic components, and original CMP signals of a vehicle are used as a signal source. When a fault needs to be simulated, a signal line for connecting the ECM and the CMP is disconnected, the simulator is connected in series with the disconnected signal line, and the required phase deviation value is set through the potentiometer, so that the ECM can receive a CMP signal after phase deviation.

Description

Technical Field

[0001] This utility model relates to the field of automotive testing simulation equipment, specifically to a gasoline engine camshaft phase fault simulator. 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, camshaft CMP signal phase deviation fault verification is required. The purpose of this verification test is to verify whether the Engine Control Module (ECM) can detect the fault and report relevant fault codes when a camshaft CMP signal phase deviation fault occurs. Traditional fault simulation methods involve lowering the phase deviation fault threshold using software during the calibration phase. Even if the camshaft signal phase is normal, a fault will still be reported because the fault threshold has been lowered. This leads to the inference that when the actual camshaft signal phase is abnormal, the ECM can detect the fault and report relevant fault codes. However, this software-based fault threshold adjustment method 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 fault simulation method using software to lower the fault threshold is prohibited.

[0003] The main problems with traditional methods are:

[0004] 1. The actual CMP signal phase deviation is within the normal range.

[0005] 2. The phase deviation of the signal received by the ECM is also normal.

[0006] 3. When the fault threshold is lowered to below the normal CMP signal phase deviation range, a fault is reported.

[0007] 4. Traditional methods cannot simulate real CMP signal phase deviation fault conditions.

[0008] 5. Traditional methods are only applicable to the research and development stage.

[0009] Therefore, after the introduction of the China VI emission standard regulations, it is prohibited to use software methods to adjust fault thresholds during PVE verification in the mass production stage of vehicles.

[0010] To address the aforementioned issues, we have made a series of improvements. Utility Model Content

[0011] The purpose of this invention is to provide a gasoline engine camshaft phase fault simulator to overcome the above-mentioned shortcomings and deficiencies of the existing technology.

[0012] A gasoline engine camshaft phase fault simulator includes: a 5V battery, a fuse F1, a switch S1, a diode D1, a potentiometer R1, a first resistor R2, a second resistor R3, a first capacitor C1, a second capacitor C2, a microcontroller MCU, a MOSFET Q1, a first socket J1, a second socket J2, and an optocoupler U1. The positive terminal of the 5V battery is connected to one end of the fuse F1, the other end of the fuse F1 is connected to one end of the switch S1, the other end of the switch S1 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the positive terminal of the microcontroller MCU, one fixed terminal of the potentiometer R1 is connected to one end of the second resistor R3, the other end of the second resistor R3 is connected to the drain of the MOSFET Q1, one end of the first capacitor C1, and the second socket J2. The movable terminal of potentiometer R1 is connected to the deviation input of the microcontroller MCU. The two output terminals of optocoupler U1 are connected to the two signal trigger input terminals of the microcontroller MCU. One end of the first resistor R2 is connected to the anode input terminal of optocoupler U1 and one end of the second capacitor C2. The other end of the first resistor R2 is connected to the first socket J1. The other end of the second capacitor C2 is connected to the cathode input terminal of optocoupler U1 and ground. The cathode input terminal of optocoupler U1, the other fixed terminal of potentiometer R1, the cathode of the microcontroller MCU, the source of MOSFET Q1, and the other end of the first capacitor C1 are connected to the cathode of a 5V battery. When in use, the first socket J1 is connected to the CMP signal line, and when in use, the second socket J2 is connected to the ECM signal line.

[0013] Furthermore, the negative terminal of the 5V battery is grounded.

[0014] The beneficial effects of this utility model are:

[0015] Compared with traditional technologies, this invention utilizes common electronic components to construct a CMP signal phase fault simulator, using the vehicle's original CMP signal as the signal source. When a fault needs to be simulated, the signal line connecting the ECM and CMP is disconnected, and the simulator is connected in series with the disconnected signal line. The required phase deviation is set using a potentiometer, achieving the purpose of allowing the ECM to receive the CMP signal with the phase deviation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure label:

[0018] 5V battery 100, fuse F1200, switch S1300, diode D1400, potentiometer R1500, first resistor R2600, second resistor R3700, first capacitor C1800, second capacitor C2900, microcontroller MCU 1000, MOSFET Q11100, first socket J11200, second socket J21300, and optocoupler U11400.

[0019] CMP signal line 1 and ECM signal line 2. Detailed Implementation

[0020] 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.

[0021] Example 1

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] like Figure 1As shown, a gasoline engine camshaft phase fault simulator includes: a 5V battery 100, a fuse F1200, a switch S1300, a diode D1400, a potentiometer R1500, a first resistor R2600, a second resistor R3700, a first capacitor C1800, a second capacitor C2900, a microcontroller MCU 1000, a MOSFET Q11100, a first socket J11200, a second socket J21300, and an optocoupler U11400. The positive terminal of the 5V battery 100 is connected to one end of the fuse F1200, the other end of the fuse F1200 is connected to one end of the switch S1300, the other end of the switch S1300 is connected to the anode of the diode D1400, and the cathode of the diode D1400 is connected to the microcontroller MCU. The positive terminal of 1000 is connected to one fixed terminal of potentiometer R1500 and one end of the second resistor R3700. The other end of the second resistor R3700 is connected to the drain of MOSFET Q11100, one end of the first capacitor C1800, and the second socket J21300. The movable terminal of potentiometer R1500 is connected to the offset input of microcontroller MCU 1000. The two output terminals of optocoupler U11400 are connected to the microcontroller MCU. The two signal trigger input terminals of 1000 are connected. One end of the first resistor R2600 is connected to the anode input terminal of the optocoupler U11400 and one end of the second capacitor C2900. The other end of the first resistor R2600 is connected to the first socket J11200. The other end of the second capacitor C2900 is connected to the cathode input terminal of the optocoupler U11400 and ground. The cathode input terminal of the optocoupler U11400, the other fixed terminal of the potentiometer R1500, the negative terminal of the microcontroller MCU1000, the source of the MOSFET Q11100, and the other end of the first capacitor C1800 are connected to the negative terminal of the 5V battery 100. When in use, the first socket J11200 is connected to the CMP signal line 1, and the second socket J21300 is connected to the ECM signal line 2.

[0024] The negative terminal of the 5V battery 100 is grounded.

[0025] As mentioned in the background section, while the traditional method of "software-based fault threshold lowering" is simple, it cannot reflect real fault conditions; it merely pretends the signal is faulty. Therefore, it can only be used for rapid verification of system functionality during the R&D phase. In the mass production phase, regulations require verification through real fault simulation to ensure that the engine can correctly detect faults in actual use. Therefore, the purpose of this invention is to manufacture a simulator device that connects the simulator in series with a disconnected signal line and uses a potentiometer to set the required phase deviation, thereby enabling the ECM to receive the CMP signal after the phase deviation.

[0026] The specific method is as follows: the positive terminal of the 5V battery 100 supplies power to the entire circuit through fuse F1200, switch S1300, and diode D1400, while the negative terminal of the 5V battery 100 provides a negative circuit to all grounded components through grounding. Fuse F1200 provides overcurrent protection for the entire circuit, diode D1400 provides reverse connection protection, and switch S1300 is used to connect or disconnect the power supply to the entire circuit. The second capacitor C2900 prevents interference signals from entering the optocoupler U11400, which protects the microcontroller MCU 1000 from damage caused by abnormal signals. The second resistor R3700 pulls the potential at the second socket J21300 to 5V when the MOSFET Q11100 is off, and pulls the potential at the second socket J21300 to 0V when the MOSFET Q11100 is on. Rotating potentiometer R1500 outputs a 0-5V voltage at its movable terminal, which serves as the phase deviation requirement signal for the microcontroller MCU 1000. The vehicle's original CMP signal line 1 is attenuated by the first resistor R2600 and filtered by the second capacitor C2900, then isolated by the optocoupler U11400 before being supplied to the microcontroller MCU 1000. The microcontroller MCU 1000 adjusts the phase of the input CMP signal line 1 according to the preset settings on potentiometer R1500, outputting a signal with phase deviation. This signal is amplified by MOSFET Q11100 and connected to the second socket J21300. The second capacitor C2900 filters out noise from the signal at the second socket J21300. ECM signal line 2 receives a signal from the second socket J21300. Rotating potentiometer R1500 changes the phase deviation of the CMP signal line 1 received by ECM signal line 2. When the phase deviation of the signal received by ECM signal line 2 from the second socket J21300 exceeds the fault threshold, a related fault is reported.

[0027] In summary, the difference between this invention and traditional methods lies in the fact that this invention does not use software to modify the fault threshold, but instead achieves hardware-based simulation of a large phase deviation in the CMP signal. Traditional technologies, however, cannot be used because they do not meet the PVE fault verification requirements of the latest emission regulations, while this invention is fully compliant. This invention utilizes hardware to send the normal CMP signal with a phase deviation to the ECM. Specifically, it uses common electronic components to construct a CMP signal phase fault simulator, using the vehicle's original CMP signal as the signal source. When a fault needs to be simulated, the signal line connecting the ECM and CMP is disconnected, the simulator is connected in series with the disconnected signal line, and the required phase deviation is set using a potentiometer, thus allowing the ECM to receive the phase-deviationd CMP signal.

[0028] 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 gasoline engine camshaft phase fault simulator characterized by, Comprise: 5V battery (100), fuse F1 (200), switch S1 (300), diode D1 (400), potentiometer R1 (500), first resistor R2 (600), second resistor R3 (700), first capacitor C1 (800), second capacitor C2 (900), microcontroller MCU (1000), MOS tube Q1 (1100), first socket J1 (1200), second socket J2 (1300) and optocoupler U1 (1400), one end of the positive electrode of the 5V battery (100) is connected with one end of the fuse F1 (200), the other end of the fuse F1 (200) is connected with one end of the switch S1 (300), the other end of the switch S1 (300) is connected with the anode of the diode D1 (400), the cathode of the diode D1 (400) is connected with the positive electrode of the microcontroller MCU (1000), one end of the fixed end of the potentiometer R1 (500) and one end of the second resistor R3 (700), the other end of the second resistor R3 (700) is connected with the drain of the MOS tube Q1 (1100), one end of the first capacitor C1 (800) and the second socket J2 (1300), the movable end of the potentiometer R1 (500) is connected with the deviation input of the microcontroller MCU (1000), the two output ends of the optocoupler U1 (1400) are connected with the two signal trigger input ends of the microcontroller MCU (1000), one end of the first resistor R2 (600) is connected with the input anode end of the optocoupler U1 (1400) and one end of the second capacitor C2 (900), the other end of the first resistor R2 (600) is connected with the first socket J1 (1200), the other end of the second capacitor C2 (900) is connected with the input cathode end of the optocoupler U1 (1400) and the ground, the input cathode end of the optocoupler U1 (1400), the other fixed end of the potentiometer R1 (500), the negative electrode of the microcontroller MCU (1000), the source of the MOS tube Q1 (1100) and the other end of the first capacitor C1 (800) are connected with the negative electrode of the 5V battery (100), the first socket J1 (1200) is connected with the CMP signal line (1) when in use, the second socket J2 (1300) is connected with the ECM signal line (2) when in use.

2. A camshaft phasing fault simulator for a gasoline engine as claimed in claim 1, characterized in that The negative electrode of the 5V battery (100) is grounded.

Images