Novel electric control fuel oil system

Abstract

The invention relates to a novel electric control fuel oil system. The novel electric control fuel oil system comprises a fuel tank body, a carbon tank, an oil filling pipe, an oil pump, an electric control exhaust valve, air vents, an air pressure sensor, a liquid level sensor, an air vent pipe, an oil supply / return pipeline, a control unit and an electric control check valve. The air vents of the carbon tank and a fuel tank are in communication with the electric control exhaust valve through the air vent pipe, the electric control exhaust valve is arranged in the fuel tank body, and a pressure type liquid level sensor is arranged at the bottom of the fuel tank body. The air pressure sensor is arranged at the top of the fuel tank body, the electric control check valve is arranged at the joint of the oil filling pipe and the fuel tank body, and the control unit communicates with the whole vehicle ECU in the form of a CAN bus. According to the technical scheme, the design is ingenious,and the structure is compact. The rapidity and high sensitivity of an electric control valve are utilized to quickly exhaust gas to control the internal pressure, the smoothness of oil filling is improved, and the phenomena of back injection and back surge are eliminated.

Description

technical field [0001] The invention relates to a fuel system, in particular to a novel electronically controlled fuel system, which belongs to the technical field of fuel tank structural components. Background technique [0002] The fuel system is a part of the automobile chassis or powertrain system. Its main function is to provide fuel for the automobile engine. The fuel system can be divided into four modules according to the function, namely the fuel storage module, the fuel transmission module, the steam management module, and the measurement control module. module. [0003] During the refueling process of the car, the vapor in the fuel tank is required to be discharged to the carbon tank through the pipeline for desorption treatment. When refueling reaches the automatic jump gun, the fuel volume in the fuel tank meets the requirements. The current fuel system uses the "liquid level control valve" to close and cut off the exhaust at a certain height, so that the fuel ...

AI Technical Summary

Problems solved by technology

[0006] The traditional fuel system has the following problems: 1) Refueling performance: Fuel enters the fuel tank through the fuel injection pipe. As the refueling progresses, the liquid level inside the fuel tank rises, and the steam inside the tank is discharged into the carbon tank through various valves and through the ventilation pipeline. When the oil level reaches the closing height of the liquid level control valve, the valve is closed due to the buoyancy of the liquid on the float inside the valve. At this time, the internal pressure of the fuel tank rises, and the fuel cannot be continuously injected, and the fuel gun jumps; After the gun jumps for the first time, the high-pressure gas inside the fuel tank is slowly discharged through the gravity valve. When the internal pressure of the fuel tank drops to a certain value, it can continue to refill. After adding a certain amount of fuel, the internal pressure of the fuel tank rises again, and the fuel gun jumps again. , and then repeat a certain number of refills to the full volume. Since the internal pressure of the fuel tank through the gravity valve releases slowly after the refueling gun jumps for the first time, due to the impact of liquid fuel during refilling, there will be back injection and back surge at the refueling port. and other phenomena

Because the traditional fuel system uses a mechanical valve, it is in a normally open state when there is no fuel submerged, and the valve vent line is connected to the carbon tank, so there is a certain amount of dynamic leakage when the vehicle is running dynamically, and the system line cannot Actively closed or opened, it cannot be applied in a high-pressure system environment. In addition, because the valve may be closed due to the fuel impact caused by the body shaking, there is a requirement to reopen the pressure. The fuel volume measurement of the traditional fuel system relies on the float level sensor. 3) In terms of safety performance: when the vehicle overturns or rolls over, the fuel system must be closed to avoid accidents caused by fuel leakage. The mechanical valves in the traditional fuel system have performance parameters for the closing angle. will shut down immediately in the event of an unexpected

Therefore, the traditional fuel tank system mainly has insufficient refueling smoothness, and there are phenomena such as reverse injection and reverse surge when refilling; the volume control and liquid level display are not accurate enough; there is dynamic leakage when driving; it is not compatible with high-pressure fuel systems, etc.

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