Fuel evaporation control system based on pilot-operated type fuel tank isolating valve

Abstract

The invention discloses a fuel evaporation control system based on a pilot-operated type fuel tank isolating valve. The fuel evaporation control system comprises an engine control unit, a desorption control valve and an ash filter, a ventilation solenoid valve, a carbon canister, an isolation valve assembly, a pressure detection module and a fuel tank assembly which communicate with each other in sequence, wherein the isolation valve assembly comprises a basic module and a control module, the basic module comprises a valve body, a two-way valve assembly and a pilot-operated cavity, the two-way valve assembly is installed in the valve body and divides the valve body into a first cavity and a second cavity, a positioning rod of the two-way valve assembly penetrates through one side of the valve body to make contact with the elastic side of the pilot-operated cavity, the control module comprises a fixing support, an independent cavity and a transmission pin shaft, one end of the transmission pin shaft penetrates through the fixing support to make contact with the elastic side of the independent cavity, and one inner cavity of the independent cavity communicates with one inner cavity of the pilot-operated cavity through a pipeline. By means of the fuel evaporation control system based on the pilot-operated type fuel tank isolating valve, the workload of the carbon canister can be reduced, and the carbon canister realizes the function of low HC emission under the low desorption condition.

Description

technical field [0001] The invention belongs to the technical field of fuel evaporation control systems, and in particular relates to a pilot-operated fuel tank isolation valve and a fuel evaporation control system. Background technique [0002] The carbon canister can absorb the volatilized fuel vapor from the fuel tank. When the engine is running, the negative pressure in the intake manifold can transport the fuel vapor absorbed in the canister to the combustion chamber to participate in combustion, which not only reduces the volatilization of fuel vapor, but also achieves the purpose of energy saving. With China's energy-saving and emission-reduction requirements, there will be more and more hybrid models. The main feature of this type of vehicle is that the working time of the engine is getting shorter and shorter, which will cause the fuel vapor adsorbed in the carbon tank to be unable to desorb cleanly, and when the vehicle is parked, more fuel vapor will be volatilize...

AI Technical Summary

Problems solved by technology

Due to the complex manufacturing process of honeycomb carbon rods, technical monopoly and other factors, the cost is high. Honeycomb carbon rods can be divided into different specifications, and the cost of different specifications is quite different.

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