Evaporative emission system integrity module
First Claim
1. An evaporative emission control and leak detection system for a motor vehicle, the system in fluid communication with emissions from a fuel tank, an engine and a carbon canister, the system comprising:
- an integrated valve module in fluid communication with the carbon canister and the atmosphere, and arranged to vent the system when exposed to predetermined high negative and positive pressure conditions, the module including;
a switch mechanism operable to indicate when the system is in a low negative pressure condition;
a one-way high negative pressure valve coupled to a fluid passage between the carbon canister and the atmosphere; and
a one-way high positive pressure valve coupled to a fluid passage between the carbon canister and the atmosphere that bypasses the high negative pressure valve and the switch;
wherein the high negative and high positive pressure valves are positioned in a stacked arrangement along a common axis in the valve module.
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Abstract
An evaporative emission control and leak detection system for a motor vehicle is provided. The system is in fluid communication with a fuel tank, an engine, and a carbon canister and includes an integrated valve module that is in fluid communication with the carbon canister and the atmosphere. The module provides for venting of the system when the system is exposed to predetermined high negative and positive pressure conditions, and a predetermined low negative pressure condition. The module also includes a switch that is operable to indicate when the system is in a high or low negative pressure condition for leak detection verification of the system.
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Citations
7 Claims
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1. An evaporative emission control and leak detection system for a motor vehicle, the system in fluid communication with emissions from a fuel tank, an engine and a carbon canister, the system comprising:
an integrated valve module in fluid communication with the carbon canister and the atmosphere, and arranged to vent the system when exposed to predetermined high negative and positive pressure conditions, the module including;
a switch mechanism operable to indicate when the system is in a low negative pressure condition;
a one-way high negative pressure valve coupled to a fluid passage between the carbon canister and the atmosphere; and
a one-way high positive pressure valve coupled to a fluid passage between the carbon canister and the atmosphere that bypasses the high negative pressure valve and the switch;
wherein the high negative and high positive pressure valves are positioned in a stacked arrangement along a common axis in the valve module. - View Dependent Claims (2, 3, 4, 5, 6, 7)
Specification