Straddled Vehicle Evaporative Emission Leak Test Component Positioning
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Solution Overview
Problem
The evaporative emission system in straddled vehicles requires enhanced waterproofness of components for leak testing to prevent fuel leakage and withstand environmental exposure, such as rain and high-pressure washing.
Innovation Solution
The components for leak testing, including pressure sensors, electric vent valves, and suction pumps, are strategically positioned and protected by appearance components to minimize exposure to water and UV radiation, using hermetic connections and support members to ensure waterproofness and air-tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If components for leak testing are exposed to the outside environment, then ease of operation and maintenance is improved, but waterproofness and light fastness deteriorate due to rain water and high-pressure wash water exposure
Solution Approach 1:
The passage connection portion and electric-wire-connection portion are nested within the interior space of the canister, which serves as a protective enclosure. This nesting arrangement shields the connection portions from external water exposure while maintaining their functional accessibility for leak testing operations.
Solution Approach 2:
The canister acts as an intermediary protective barrier between the leak test components and the external environment. By positioning the connection portions inside the canister, the canister mediates the exposure to rain water and high-pressure wash water, preventing direct contact while allowing the components to perform their leak detection function.
2Object-affected harmful factors
If components for leak testing are positioned inside the canister, then waterproofness is improved, but device complexity increases due to integration requirements
Solution Approach 1:
The leak test components (passage connection portion and electric-wire-connection portion) are merged within the unified interior space of the canister. This combining approach consolidates multiple functions into a single structural enclosure, simplifying the overall device architecture while maintaining protective capabilities.
Solution Approach 2:
The canister serves multiple functions: it contains activated carbon for evaporation fuel collection, provides structural housing for the vehicle, and simultaneously acts as a protective enclosure for the leak test connection portions. This multi-functionality reduces the need for separate protective structures, thereby reducing overall device complexity.
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 effectively enhances the waterproofness and light fastness of the passage connection and electric-wire-connection portions, preventing water ingress and maintaining system integrity during vehicle operation and washing.
Implementation Method 1
The evaporative emission system causes the evaporation fuel that has flowed from the fuel tank into the canister through the purge pipe to be adsorbed onto activated carbon in the canister
Implementation Method 2
Air tightness of the evaporative emission system is, for example, determined based on a pressure in a gas passage of the evaporative emission system when a gas in the air passage is sucked with an outside-air-introduction passage closed
Data Source
AI summary
A gas-leak-detection device for detecting a gas leakage from an evaporative emission system includes an electric-wire-connection portion and a passage connection portion that are disposed to overlap with at least one of appearance components in a vehicle when the vehicle is seen in a viewing direction, and are disposed closer to the at least one appearance component than a center plane perpendicular to the viewing direction when the vehicle is in an upright state, the center plane being one of an imaginary-lateral-center plane that is an imaginary vertical plane perpendicular to the left-right direction, an imaginary-longitudinal-center plane that is an imaginary vertical plane including a center in the front-rear direction and being perpendicular to the front-rear direction, or an imaginary-vertical-center plane that is an imaginary horizontal plane including a center in the top-bottom direction and being perpendicular to the top-bottom direction.