# US 9,752,539 B2 · Method for diagnosing leaks downstream of the purge flow control orifice

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- Number: US 9,752,539 B2
- Document ID: US9752539B2
- Status: Granted
- Kind: B2
- Application number: 15/140,439
- Filed: 2016-04-27
- Published: 2016-12-22
- Granted: 2017-09-05
- Earliest claimed: 2015-06-18
- Assignees: GM Global Technology Operations LLC
- Applicants: GM Global Technology Operations LLC
- Inventors: Darrell W. Burleigh; Sergio Quelhas; Lawrence A. Staat; Kenneth C. Swartz
- Web page: https://patentgrep.com/patent/US9752539B2

## CPC

- F02M 25/0854: {Details of the absorption canister}
- F02M 25/0836: {Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold}
- F02M 25/0818: {having means for pressurising the evaporative emission space}
- F02M 2025/0845: {Electromagnetic valves}
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A vapor purge system for an engine, includes a purge valve having a housing including an input port in communication with a purge canister and including an output port in communication with an intake system component defining a first bore portion receiving the output port with a first seal member disposed therebetween. The intake system component includes a second bore portion receiving a housing portion of the purge valve with a second seal member disposed therebetween. The first and second seal members are spaced such that when the housing is pulled away from the intake system component and the first seal member is out of engagement between the first bore and the output port, the second seal member can remain in engagement so that a diagnostic module can diagnose detachment of the purge valve from the intake system before any hydrocarbon vapor can be released into the atmosphere.

## Claims

### Claim 1

A vapor purge system for an internal combustion engine, comprising:
a purge canister;
a purge valve having a housing including an input port in communication with the purge canister and including an output port in communication with an intake system; and
an intake system component defining a first bore portion receiving the output port with a first seal member disposed therebetween, the intake system component further including a second bore portion receiving a housing portion of the purge valve with a second seal member disposed therebetween, wherein the first and second seal members are positioned such that when the housing is pulled away from the intake system component and the first seal member is out of engagement between the first bore and the output port, the second seal member can remain in engagement between the second bore portion and the housing portion of the purge valve, so that a disconnect or other leak condition at the output port can be detected without any leakage to the atmosphere.

### Claim 2 (depends on 1)

The vapor purge system for an internal combustion engine according to claim 1, further comprising a control module for controlling opening of the purge valve.

### Claim 3 (depends on 2)

The vapor purge system for an internal combustion engine according to claim 2, further comprising a pressure sensor disposed between a pump and the purge valve, the pressure sensor providing a pressure signal to the control module for diagnosing whether the purge valve is detached from the intake system component.

### Claim 4

A vapor purge system for an internal combustion engine, comprising:
a purge canister;
a purge valve having a housing including an input port in communication with the purge canister and including an output port; and
an intake system component defining a first bore portion receiving the output port;
a control module for controlling opening of the purge valve;
a pressure sensor disposed between a pump and the purge valve, the pressure sensor providing a pressure signal to the control module, the control module diagnosing whether the purge valve is detached from the intake system component by activating the pump when the purge valve is closed and determining whether the pressure increases as expected if the purge valve were properly connected.