Patent ID: 9422895
Filing Date: 2016-08-23
CPC Classification: B60K,F02M,Y10T

Claim Text:
1. A system comprising: a fuel tank; a canister in fluid communication with the fuel tank to receive vapor escaping from the fuel tank; a first diurnal control valve and a second diurnal control valve positioned sequentially along a first vapor line that extends from the fuel tank to the canister, wherein each of the first diurnal control valve and the second diurnal control valve is an on/off valve; a pressure sensor in fluid communication with the canister and arranged on the first vapor line between the first diurnal control valve and the second diurnal control valve; a release valve positioned along a second vapor line that extends from the fuel tank to the canister and bypasses the first diurnal control valve, the pressure sensor and the second diurnal control valve; a purge valve positioned between the canister and an internal combustion engine to be in fluid communication with the canister and the internal combustion engine; a canister vent valve positioned on an air inlet of the canister for allowing air to purge vapor from the canister to exit the canister and into the internal combustion engine; and one or more electronic controllers coupled to the pressure sensor, the first diurnal control valve, the purge valve, and the canister vent valve for controlling each of the first diurnal control valve, the purge valve, and the canister vent valve according to preset diagnostic tests for checking for malfunctions in the system, wherein the preset diagnostic tests are configured to check for malfunctions of the purge valve, the canister vent valve and the first diurnal control valve.