Diagnostic system for canister purge system

Details Diagnostic system for canister purge system Diagnostic system for canister purge system

1991-10-02

1993-03-09

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

051918706

ABSTRACT:
An on-board diagnostic system determines if there is a leak in the portion of a canister purge system that includes the fuel tank and the canister that collects volatile fuel vapors from the fuel tank's headspace. A vacuum regulator/sensor placed in the conduit between the CPS valve and the canister, includes a switch providing a signal indicating the presence or absence of a leak. The sensor also indicates both positive and negative pressures relative to a reference pressure such as atmosphere. During diagnostic testing, the switch is closed and if the switch becomes open this indicates a leak in the headspace of fuel tank on the canister.

REFERENCES:
patent: 4949695 (1991-08-01), Uranashi
patent: 5085194 (1992-02-01), Kuroda
patent: 5085197 (1992-02-01), Mader
patent: 5105789 (1992-04-01), Aramaki
patent: 5143035 (1992-09-01), Kayanuma

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