Fuel Storage Device Negative Pressure Flow Control
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Solution Overview
Problem
Existing fuel storage devices face challenges in stabilizing the concentration of evaporated fuel gas sent to the engine combustion chamber, leading to unstable engine combustion, poor exhaust gas quality, and excessive fuel vapor emission, which violates evaporative control regulations.
Innovation Solution
A fuel storage device configuration that includes a fuel tank, a circulation passage, a canister for recovering evaporated fuel gas, and an adjuster using negative pressure to control the flow rate of evaporated fuel gas through the circulation passage, ensuring efficient circulation and preventing external emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If evaporated fuel gas is sent to the engine combustion chamber without flow rate control, then the fuel vapor recovery function is achieved, but the engine combustion becomes unstable and exhaust gas quality deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the flow rate of evaporated fuel gas to the engine combustion chamber within a specific range (5-50% of total vapor production). This quantitative parameter control ensures stable combustion and improved exhaust quality while maintaining vapor recovery functionality.
Solution Approach 2:
The patent implements feedback control through a flow rate adjuster that regulates the amount of evaporated fuel gas sent to the engine. The system monitors and adjusts the vapor flow dynamically to maintain optimal combustion conditions, preventing both excessive and insufficient vapor intake.
2Object-generated harmful factors
If the flow rate of evaporated fuel gas is not controlled during fuel supply, then the vapor recovery system operates continuously, but excessive fuel vapor is emitted externally violating regulatory limits
Solution Approach 1:
The patent uses parameter changes by adjusting the vapor flow rate to specific ranges under different operating conditions. During fuel supply, the system limits vapor emission by controlling the flow rate adjuster to maintain emissions within regulatory limits while still achieving recovery functionality.
Solution Approach 2:
The patent applies dynamics by making the vapor flow rate adjustable and responsive to operating conditions. The flow rate adjuster dynamically modifies the vapor flow based on real-time conditions, enabling the system to comply with evaporative control regulations under varying operational scenarios.
3Reliability
If a complex flow rate control system is introduced to stabilize engine combustion, then combustion stability improves, but device complexity increases
Solution Approach 1:
The patent applies self-service by designing a flow rate adjuster that automatically regulates evaporated fuel gas flow without requiring external control systems. The device self-regulates based on inherent pressure differentials and flow characteristics, achieving combustion stability without adding complex electronic controls or sensors.
Solution Approach 2:
The patent uses an intermediary approach by introducing a flow rate adjuster as a passive flow control element between the vapor source and engine intake. This intermediary component simplifies control by using fluid dynamics principles rather than active control systems, reducing overall device complexity while maintaining reliability.
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
This configuration stabilizes the engine combustion, improves exhaust gas quality, and effectively prevents evaporated fuel gas from being emitted externally, adhering to regulatory limits by optimizing the flow rate of evaporated fuel gas during fuel supply.
Implementation Method 1
The adjuster is configured to adjust a circulation flow rate of the gas flowing through the circulation passage in supply of the fuel, using a negative pressure
Implementation Method 2
a canister (13) that recovers gas to be generated in the fuel tank
Data Source
AI summary
A fuel storage device includes a fuel tank, a circulation passage, a canister, a vapor passage, and an adjuster. The fuel tank is configured to store fuel. The circulation passage fluidly connects the fuel tank and a vicinity of a fuel supply port. The canister is configured to recover gas generated in the fuel tank. The vapor passage fluidly connects the fuel tank and the canister. The adjuster is configured to adjust a circulation flow rate of the gas flowing through the circulation passage in supply of the fuel, using a negative pressure.