Fuel vapor leak diagnostic system integrated with self-calibrating controller

Abstract

The utility model discloses a kind of fuel evaporation leakage diagnosis systems of integrated self-calibration controller, system includes split type shell, it is characterized in that, shell one end is provided with carbon can interface and carbon can connection;Shell inside is provided with air pump, air pump export end is provided with outlet pipeline, outlet pipeline end is provided with two branch pipelines, first branch pipeline end is provided with main hole and electromagnetic valve mechanism cooperation, second branch pipeline is connected with loop pipeline by standard leak hole, loop pipeline other end is connected to air pump gas inlet end, by executing pressure detection, routine detection and composite detection, whether there is leakage is judged by independent analysis judging module;Solved prior art only relies on air pump motor current to carry out leakage judgment, misjudgment rate is high, and there is no PCB board inside, compatibility of EMC is not good, simultaneously judged basis is seriously dependent on product calibration, the use condition of vehicle has complexity and uncertainty, repeated detection and misjudgment situation prominent problem.

Description

Technical Field

[0001] This utility model relates to the field of knowledge base management technology, specifically to a fuel evaporation leak diagnosis system with an integrated self-calibration controller. Background Technology

[0002] Existing fuel evaporation leak diagnostic systems are all designed and developed based on the requirements of GB18352.6-2016 "Limits and Measurement Methods for Pollutant Emissions from Light-Duty Vehicles (China VI)" J4.4 Evaporation System Monitoring. They all refer to J.4.4.2.2(B) / (C) as the fault standard for leakage, that is, the leakage generated by a small hole with a diameter of 0.5mm is used as the fault judgment standard. Existing technologies rely solely on the air pump motor current for leakage judgment, resulting in a high false positive rate. Furthermore, they lack an internal PCB board, leading to poor EMC compatibility. At the same time, the judgment basis heavily depends on product calibration. The operating conditions of vehicles are complex and uncertain, resulting in repeated testing and significant false positives. Therefore, a fuel evaporation leak diagnostic system with an integrated self-calibration controller is needed to solve the above technical problems. Summary of the Invention

[0003] The purpose of this invention is to propose a fuel evaporation leak diagnostic system with an integrated self-calibration controller. This system aims to solve the problems of existing technologies that rely solely on the current of the air pump motor for leak detection, resulting in a high false alarm rate. Furthermore, the lack of an internal PCB board leads to poor EMC compatibility, and the judgment is heavily dependent on product calibration. The operating conditions of vehicles are complex and uncertain, resulting in repeated testing and frequent misjudgments.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: The fuel evaporation leak diagnostic system with integrated self-calibration controller includes a split housing. One end of the housing is provided with a carbon canister interface for connection to the carbon canister. An air pump is installed inside the housing. An outlet pipe is provided at the outlet end of the air pump. Two branch pipes are provided at the end of the outlet pipe. The end of the first branch pipe is provided with a main hole that cooperates with the solenoid valve mechanism. The second branch pipe is connected to the loop pipe through a standard leak hole. The other end of the loop pipe is connected to the air pump inlet.

[0005] Preferably, the solenoid valve mechanism includes a solenoid valve body, and a sealing gasket is connected to the end of the solenoid valve body. When the solenoid valve is not triggered, the sealing gasket abuts against the main hole.

[0006] Preferably, the main port is connected to the cavity where the carbon canister interface is located, and when the main port is opened, gas enters the carbon canister interface through the cavity.

[0007] Preferably, the air pump is connected to the motor and powered by the motor.

[0008] Preferably, a PTC heater is provided at the air inlet end of the air pump.

[0009] Preferably, a pressure gauge is connected to the carbon canister interface for monitoring gas pressure.

[0010] Preferably, the pressure gauge, air pump, solenoid valve, and motor are all connected to the autonomous analysis and judgment module, which is connected to execute the leakage detection logic judgment program.

[0011] Preferably, the autonomous analysis and judgment module is also connected to a temperature sensor.

[0012] Preferably, the autonomous analysis and judgment module is connected to the ECU; the air pump's circuit pipeline is connected to the air filter; one end of the carbon canister is connected to the manifold through the carbon canister control valve, and the other end is connected to the fuel tank.

[0013] Furthermore, a CAN interface is provided for communication with the host ECU.

[0014] Furthermore, a CAN bootloader upgrade program is included, allowing upgrades to be performed without opening the cover.

[0015] Furthermore, the autonomous analysis and judgment module is equipped with OTA function, deploys AI model in the cloud, optimizes and adjusts calibration parameters through AI, sends configuration parameters to DMTL controller, calibrates the calibration algorithm, sends status information to the user terminal in the cloud, and is integrated with EVAP valve design.

[0016] Furthermore, it includes host computer software and fuel evaporation leak diagnosis system calibration software.

[0017] Compared with the prior art, the present invention has the following technical effects: This utility model adds a CAN interface for convenient communication with the host ECU, and a new CAN bootloader upgrade program that eliminates the need to open the cover. It also adds OTA functionality, deploying an AI model in the cloud to optimize and adjust calibration parameters, sending configuration parameters to the DMTL controller, and calibrating the calibration algorithm. Status information is sent from the cloud to the user terminal. It features an integrated design with the EVAP valve. The host computer software includes calibration software for a fuel evaporation leak diagnostic system. New pressure and temperature sensors are added, and the combined judgment of motor current and pressure improves accuracy and effectively reduces false alarms. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the connection between this utility model and the carbon canister; In the diagram: 1. Pressure gauge; 2. Standard leak hole; 3. Solenoid valve; 4. Motor; 5. Air pump; 6. PTC heating element; 7. Temperature sensor; 8. Autonomous analysis and judgment module; 101. Manifold; 102. Carbon canister control valve; 103. Carbon canister; 104. Oil tank; 105. Air filter; 106. ECU; 11. Housing; 12. Carbon canister interface; 13. Sealing gasket; 14. Main hole; 15. Outlet pipe. Detailed Implementation

[0019] Example 1: like Figure 1 As shown, the fuel evaporation leak diagnostic system with integrated self-calibration controller includes a split housing 11. One end of the housing 11 is provided with a carbon canister interface 12 connected to a carbon canister 103. An air pump 5 is provided inside the housing 11. An outlet pipe 15 is provided at the outlet end of the air pump 5. Two branch pipes are provided at the end of the outlet pipe 15. The end of the first branch pipe is provided with a main hole 14 that cooperates with the mechanism of the solenoid valve 3. The second branch pipe is connected to the loop pipe through a standard leak hole 2. The other end of the loop pipe is connected to the air inlet of the air pump 5.

[0020] Preferably, the solenoid valve 3 mechanism includes a solenoid valve 3 body, and a sealing gasket 13 is connected to the end of the solenoid valve 3 body. When the solenoid valve 3 is not triggered, the sealing gasket 13 abuts against the main hole 14.

[0021] Preferably, the main hole 14 is connected to the cavity where the carbon canister interface 12 is located, and when the main hole 14 is opened, gas enters the carbon canister interface 12 through the cavity.

[0022] Preferably, the air pump 5 is connected to the motor 4 and is powered by the motor 4.

[0023] Preferably, a PTC heater is provided at the air inlet end of the air pump 5.

[0024] Preferably, a pressure gauge 1 is connected to the carbon canister interface 12 for monitoring gas pressure.

[0025] Preferably, the pressure gauge 1, air pump 5, solenoid valve 3 and motor 4 are all connected to the autonomous analysis and judgment module 8, which is connected to execute the leakage detection logic judgment program.

[0026] Preferably, the autonomous analysis and judgment module 8 is also connected to a temperature sensor 7.

[0027] Preferably, the autonomous analysis and judgment module 8 is connected to the ECU 106; the circuit pipeline of the air pump 5 is connected to the air filter 105; one end of the carbon canister 103 is connected to the manifold 101 through the carbon canister control valve 102, and the other end is connected to the fuel tank.

[0028] Example 2: like Figure 2As shown, the method for diagnosing fuel evaporation leaks using an integrated self-calibration controller includes the following steps: S1, Perform stress detection: With the carbon canister 103 and carbon canister control valve 102 in the closed state, the air pump 5 supplies air. The system monitors the pressure values ​​of the carbon canister 103, oil tank 104 and pipelines through pressure gauge 1; combined with the value changes of temperature sensor 7, it reads the pressure fluctuation over a period of time, and the autonomous analysis and judgment module 8 determines whether there is a leak and feeds back the result to ECU 106. S2, Perform routine checks: Air is pumped in by motor 4 driving air pump 5. With solenoid valve 3 in the initial state, the gas forms a circulation loop through standard leak hole 2. After the current of motor 4 stabilizes, the current of motor 4 is read and recorded. The solenoid valve 3 is put into operation, and the gas enters the carbon canister 103, oil tank 104 and pipeline through the main hole 14. After the current of motor 4 stabilizes, the current of motor 4 is read and recorded. The two recorded current data are sent to the autonomous analysis and judgment module 8 to determine whether there is a leak, and the result is fed back to ECU 106; S3, Perform composite detection: Based on the combined pressure test and routine test data, the autonomous analysis and judgment module 8 determines whether a leak exists for data that is outside the standard leak threshold 2 but within the standard 1.0mm leak threshold, and feeds the result back to ECU 106; the leak detection logic judgment program of the autonomous analysis and judgment module 8 includes: During pressure testing, if the pressure fluctuation exceeds the threshold range within a fixed time period, and the temperature change also exceeds the threshold range, it is determined to be a leak. During routine testing, if the difference between two recorded currents exceeds the judgment threshold, it is determined to be a leak.

[0029] Furthermore, a CAN interface is provided for communication with the host ECU106.

[0030] Furthermore, a CAN bootloader upgrade program is included, allowing upgrades to be performed without opening the cover.

[0031] Furthermore, the autonomous analysis and judgment module 8 is equipped with OTA function, deploys AI model in the cloud, optimizes and adjusts calibration parameters through AI, sends configuration parameters to DMTL controller, calibrates calibration algorithm, sends status information to user terminal in the cloud, and is integrated with EVAP valve design.

[0032] Furthermore, it includes host computer software and fuel evaporation leak diagnosis system calibration software.

Claims

1. A fuel evaporation leak diagnostic system with an integrated self-calibration controller, comprising a split housing, characterized in that, One end of the housing is provided with a carbon canister interface for connection to the carbon canister; an air pump is provided inside the housing, and an outlet pipe is provided at the outlet end of the air pump. Two branch pipes are provided at the end of the outlet pipe. The end of the first branch pipe is provided with a main hole that cooperates with the solenoid valve mechanism. The second branch pipe is connected to the loop pipe through a standard drain hole. The other end of the loop pipe is connected to the air pump inlet. The solenoid valve mechanism includes a solenoid valve body. A sealing gasket is connected to the end of the solenoid valve body. When the solenoid valve is not triggered, the sealing gasket abuts against the main hole.

2. The fuel evaporation leak diagnostic system with integrated self-calibration controller according to claim 1, characterized in that: The main port is connected to the cavity where the carbon canister interface is located. When the main port is open, gas enters the carbon canister interface through the cavity.

3. The fuel evaporation leak diagnostic system with integrated self-calibration controller according to claim 1, characterized in that: The air pump is connected to the motor and powered by the motor. A PTC heater is installed at the air inlet end of the air pump.

4. The fuel evaporation leak diagnostic system with integrated self-calibration controller according to claim 1, characterized in that: A pressure gauge is connected to the carbon canister interface to monitor the gas pressure.

5. The fuel evaporation leak diagnostic system with an integrated self-calibration controller according to claim 3 or 4, characterized in that: The pressure gauge, air pump, solenoid valve, and motor are all connected to the autonomous analysis and judgment module, which in turn is connected to the ECU.

6. The fuel evaporation leak diagnostic system with integrated self-calibration controller according to claim 5, characterized in that: The autonomous analysis and judgment module is also connected to a temperature sensor.

7. The fuel evaporation leak diagnostic system with integrated self-calibration controller according to claim 6, characterized in that: The air pump's loop line is connected to the air filter, and one end of the carbon canister is connected to the manifold via the carbon canister control valve, while the other end is connected to the fuel tank.

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