Evaporated Fuel Processing Device Valve Positioning
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Solution Overview
Problem
In evaporated fuel processing devices, the adsorbing capacity is decreased due to the flow of evaporated fuel from the upstream side of the closing valve into the downstream side when the valve opens, leading to inefficient fuel management and potential regulatory compliance issues.
Innovation Solution
Incorporating a pressurizing pump, first and second pressure sensors, and a controller to specify the valve-opening-start position of the closing valve based on pressure changes detected by these sensors, reducing the outflow of evaporated fuel by controlling the valve's transition from a closed to an open state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the closing valve opens to allow evaporated fuel to flow from the upstream side to the downstream side for learning the valve-opening-start position, then the valve positioning accuracy is improved, but the adsorbing capacity of the canister deteriorates due to unwanted evaporated fuel outflow
Solution Approach 1:
The pressurizing pump is activated before the closing valve opens to create a positive pressure environment in the downstream vapor passage. This preliminary pressurization prevents evaporated fuel from flowing downstream when the valve opens during learning operations, thereby preserving adsorbent capacity while still allowing accurate valve positioning detection
Solution Approach 2:
The system uses pneumatic pressure control through the pressurizing pump to manage the flow of evaporated fuel. By controlling the pressure in the downstream vapor passage, the system prevents unwanted fuel flow during valve learning while maintaining the ability to detect the valve-opening-start position accurately
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 reduces the outflow of evaporated fuel, enhances fuel management, and ensures accurate valve positioning, thereby improving the device's operational efficiency and compliance with regulatory standards.
Implementation Method 1
a pressurizing pump configured to pressurize gas in the vapor passage downstream of the closing valve toward the closing valve
Implementation Method 2
the evaporated fuel is adsorbed by an adsorbent in the canister
Data Source
AI summary
An evaporated fuel processing device that includes a pressurizing pump configured to pressurize gas in the vapor passage downstream of the closing valve toward the closing valve; a first pressure sensor configured to detect a pressure in the fuel tank directly or indirectly, and/or a second pressure sensor configured to detect a pressure in the vapor passage downstream of the closing valve directly or indirectly. When the closing valve moves toward an open side in the closed state with the pressurizing pump pressurizing the gas in the vapor passage downstream of the closing valve toward the closing valve, the controller may specify a valve-opening-start position based on the pressure detected by the first pressure sensor and/or the pressure detected by the second pressure sensor, wherein the valve-opening-start position is a position where the closing valve transitions from the closed state to the opened state.