초록 ▼

An evaporative emission tester is used to evaluate the integrity of a vehicle's evaporative emission control system, including determining the system's purge capability. The emission tester performs a purge flow test to determine whether fuel vapor stored in the vehicle's evaporative canister and pr

An evaporative emission tester is used to evaluate the integrity of a vehicle's evaporative emission control system, including determining the system's purge capability. The emission tester performs a purge flow test to determine whether fuel vapor stored in the vehicle's evaporative canister and present in the fuel tank is being drawn into the engine for combustion at a minimum amount. The emission tester also performs a pressure test of the vehicle's evaporative canister purge system, which includes the fuel tank and lines. The emission tester can function as a stand-alone unit or as an integrated product with a host computer.

대표청구항 ▼

[ We claim:] [1.] A method for leakage testing a pressurized closed system, comprising the steps of:pressurizing the closed system with a pressurizing gas using a puff pressurization scheme by automatically activating and deactivating a pressurizing assembly a recurring number of times over a pressu

[ We claim:] [1.] A method for leakage testing a pressurized closed system, comprising the steps of:pressurizing the closed system with a pressurizing gas using a puff pressurization scheme by automatically activating and deactivating a pressurizing assembly a recurring number of times over a pressurization period; monitoring pressure levels in the closed system only during each time the pressurizing assembly is deactivated;determining when a given pressure level is reached; andautomatically comparing the pressure level in the closed system to a minimum allowable pass-test value a predetermined time period after the given pressure level is reached.