Method of predicting purge vapor concentrations

Details Method of predicting purge vapor concentrations Method of predicting purge vapor concentrations

1999-01-15

2000-09-19

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123357, 73119A, F02M 3302

Patent

active

061196622

ABSTRACT:
A method is provided for accommodating the purge vapors from an evaporative emission control system of an automotive vehicle. The method includes a means of predicting the concentration of purge vapor at the purge valve of the evaporative emission control system as a function of purge flow and accumulated flow through the canister. Purge valve flow is characterized by using a surface for air mass flow rate as a function of vacuum at the purge valve and purge valve current. The flow through the valve is used to compute instantaneous flow rate and accumulated flow rate. As such, the fuel delivered through the injectors can be adjusted in real time to improve drivability and emissions by maintaining a desired fuel to air ratio.

REFERENCES:
patent: 4961412 (1990-10-01), Furuyama
patent: 5216995 (1993-06-01), Hosoda
patent: 5680849 (1997-10-01), Morikawa
patent: 5909727 (1999-06-01), Nakagawa
patent: 5950603 (1999-09-01), Cook
patent: 5979419 (1999-11-01), Toyoda
patent: 5988150 (1999-11-01), Osanai

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