Evaporated fuel processing device and method for diagnosing evaporated fuel processing device

Abstract

A evaporated fuel processing device includes a seal valve that seals off the fuel tank from the atmosphere, a canister, a changeover valve that allows or inhibits communication of the canister with the atmosphere, the canister internal pressure sensor, a controller that sends an open/close command to the seal valve and the changeover valve, a diagnosis unit that performs leak diagnosis of an evaporated fuel sealing system, and a negative pressure pump that generates pressure in the evaporated fuel sealing system. The diagnosis unit performs leak diagnosis of the entirety of the evaporated fuel sealing system before performing leak diagnosis of a canister side section. The diagnosis unit performs function diagnosis of the seal valve with the seal valve closed and the changeover valve at a shut-off position based on whether the detection value of the tank internal pressure sensor varies beyond a predetermined range of the generated pressure.

Description

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AI Technical Summary

Benefits of technology

The technical effect of this patented technology allows for accurate diagnoses on how well an open-close mechanism works properly by analyzing its performance over time without requiring any specialized equipment or training.

Problems solved by technology

This patented describes various techniques used during evaporation type fuel treatments such as those described earlier. These include monitoring changes over time due to volatilization and emission of harmful substances through gaps within the fuel tanks' interior walls called vent holes. By measuring these changes, the presence of leaks may be detected early enough before they become significant environmental concerns. To this end, there have been developed systems where both the inside and outside surfaces of the container communicate directly without being connected together. One solution involves separating the cannister and other components prior to testing them separately. Another approach proposes providing separate passages for each component while maintaining isolate conditions at all times.

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