Sub-purge System Using Ejector for Turbocharged Vehicle Evaporation Gas Recovery
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Solution Overview
Problem
Fuel evaporation gas treatment systems in vehicles equipped with turbochargers fail to purge fuel evaporation gases effectively, leading to non-compliance with regulations and the generation of fuel smells due to increased gas release under hot conditions.
Innovation Solution
A sub-purge system is introduced, featuring a recovery port, ejector, and recovery control valve that uses the fuel pump as a driving fluid to generate negative pressure and recover fuel evaporation gases from the canister back into the fuel tank, enabling effective purging even when the turbocharger is operated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a turbocharger is operated, then engine power is improved, but fuel evaporation gas purging fails and fuel smell is generated
Solution Approach 1:
The patent introduces a canister as an intermediary device between the fuel tank and engine intake system. The canister adsorbs fuel evaporation gas (HC) that would otherwise be released into the atmosphere or cause fuel smell, and then releases it to the engine intake system when appropriate, thus mediating the harmful effect while maintaining engine power from turbocharger operation
Solution Approach 2:
The patent recovers fuel evaporation gas that would normally be discarded or released. The canister captures the evaporated fuel components and stores them, then releases them to the engine intake system where they are burned, thus recovering what would otherwise be wasted or harmful emissions
2Power
If a turbocharger is operated, then engine power is improved, but evaporation gas regulations are not satisfied
Solution Approach 1:
The canister acts as a mediator that intercepts fuel evaporation gas before it can be released to the atmosphere, adsorbs it, and then releases it to the engine intake system. This intermediary action ensures that evaporated fuel is not discharged into the environment, thus satisfying evaporation gas regulations while the turbocharger operates and maintains engine power
Solution Approach 2:
Instead of allowing fuel evaporation gas to be discarded to the atmosphere (which would violate regulations), the system recovers it through the canister's adsorption and controlled release mechanism, ensuring regulatory compliance is maintained during turbocharger operation
3Object-generated harmful factors
If the canister adsorbs fuel evaporation gas, then gas release is prevented, but the canister cannot purge the gas when turbocharger operates
Solution Approach 1:
The patent implements dynamic control of the canister's operation through a control unit that adjusts the canister close valve and purge control solenoid valve based on operating conditions. When the turbocharger is not operating, the system purges the canister effectively; when the turbocharger operates, the control unit adjusts valve positions and timing to maintain both adsorption capability and purge functionality, thus dynamically adapting to maintain both gas release prevention and purge productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sub-purge system effectively recovers and purges fuel evaporation gases, preventing their release outside the vehicle and ensuring compliance with regulations while eliminating fuel smells, even under high-temperature conditions.
Implementation Method 1
an ejector provided to receive fuel delivered by a fuel pump as a driving fluid, to suck a fuel evaporation gas collected in the canister through the recovery line and the recovery port when negative pressure is generated by the driving fluid
Implementation Method 2
The canister 10 is configured such that a case thereof is filled with an adsorbent material capable of adsorbing the fuel evaporation gas moved from the fuel tank 1, and the adsorbent material that is widely used therefor is activated carbon. The activated carbon functions to adsorb fuel components, that is, hydrocarbons (HC) or the like, in the fuel evaporation gas introduced into the case of the canister 10.
Data Source
AI summary
Disclosed is a fuel evaporation gas treatment system for a vehicle, which includes a sub-purge system configured such that a fuel evaporation gas adsorbed in a canister is recovered into a fuel tank, the sub-purge system including a recovery port formed in the canister, a recovery line connected to the recovery port, an ejector provided to receive fuel delivered by a fuel pump, to suck the fuel evaporation gas from the canister through the recovery line and the recovery port upon generation of negative pressure, and to discharge the fuel evaporation gas to the fuel tank, a driving fluid hose connecting the discharge port of the fuel pump to the driving inlet of the ejector to supply the fuel to the ejector, and a recovery control valve for opening and closing a fuel passage so that the fuel is selectively supplied to the ejector.