Due to the volatile nature of gasoline, the fuel tank of a car is often filled with a large amount of fuel vapor at normal temperature, and the leakage caused by this part of fuel vapor leakage accounts for about 20% of the total emissions, which is one of the factors that affect vehicle emission control An important factor. Therefore, the working capacity of the activated carbon tank plays a major role in the control of vehicle evaporative emissions.
When the fuel pressure in the fuel tank of the car exceeds the opening pressure of the fuel vapor valve and the activated carbon tank adsorption valve in the fuel tank, the fuel vapor valve and the activated carbon tank adsorption valve are opened, and the fuel vapor enters the activated carbon tank from the relevant path, and the fuel vapor It is adsorbed and stored in an activated carbon tank. However, the adsorption capacity of the activated carbon tank is limited, so the activated carbon tank must also have a certain desorption capacity (also known as cleaning capacity), so that the activated carbon tank in the adsorption saturation state can regain the adsorption capacity.
Under certain working conditions, the ECU controls the desorption solenoid valve to open. Under the vacuum suction of the activated carbon manifold, fresh air enters the activated carbon tank from the bottom and enters the intake manifold through the upper pipe of the activated carbon tank. Air flows through Inside the activated carbon tank, the adsorbed fuel in the activated carbon tank re-evaporates and enters the intake manifold with the air, and the carbon tank regains its adsorption capacity. Therefore, the fuel vapor emission control system can not only reduce pollutant emissions, but also improve The working efficiency of the engine. The performance of the fuel evaporative emission control system is affected by the adsorption / desorption capability of its key technical component, the activated carbon canister, which is of great significance for the detection and research of the desorption of the fuel evaporative emission control system. At present, the research on emission regulations is multi-directional. The effect of desorption flow on the working capacity of carbon canisters under different working conditions under different regulations is studied to reflect the effect of its evaporative emission control.
The working capacity and desorption amount of the carbon canister have a great influence on the evaporative emission control. The OEM must not only solve the problem of the initial working ability of the carbon canister with the carbon canister manufacturer, but also consider the decoupling of the carbon canister in the development process. With the calibration of the opening time of the solenoid valve, the evaporative emission test should consider other factors in addition to the working capacity and desorption amount of the carbon canister.
The traditional emission test needs to install many sensors to obtain such as engine speed, oxygen content, etc., the installation is complicated and the cost is high. In order to find faults and monitor and find high-emission vehicles before the vehicles become high-emission standard vehicles, from July 1, 2007, China requires all vehicles to be equipped with a standard data interface (OBDII interface) before leaving the factory. The OBD device monitors multiple systems and components, including engines, catalytic converters, particulate traps, oxygen sensors, emission control systems, fuel systems, GER, etc. Therefore, by reading the OBDII data, you can directly obtain a number of emission-related parameters, and can be used for quick and convenient testing of various vehicle models.
The "Carbon canister desorption flow + OBDII" collection system introduced by Wind Hill Technology can perfectly meet the above requirements, and is widely used in emission laboratories, emission road tests, benchmarking experiments, etc.
System composition:
1. Carbon canister flowmeter: used to measure the desorption gas flow of the carbon canister;
2. Data acquisition module M-SENS: collect flowmeter signals and synchronize CAN output;
3. Dual channel CAN card: Synchronous transmission of sensor and vehicle signals;
4. IPEmotion software: integrate OBD II diagnostic signal acquisition and sensor signal acquisition, and realize online monitoring, storage, analysis, reporting and other functions;
System icon:
Collection monitoring example:
Analysis example:
Example 1: Flow rate, throttle opening, engine speed
Example 2: Integrate the flow signal to get the total flow value
Example 3: Other OBD II signals
At present, the program has been widely used in China Automobile Technology Research Center, Beijing Modern Research Center and so on.
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