Regulation of engine parameters in response to vapor recovery pu

Details Regulation of engine parameters in response to vapor recovery pu Regulation of engine parameters in response to vapor recovery pu

1987-05-04

1988-06-07

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123489, 123416, F02M 2508, F02M 5100

Patent

active

047489596

ABSTRACT:
An apparatus and a method for controlling hydrocarbon emission from an internal combustion engine having an air/fuel intake coupled to a fuel vapor recovery system. Fuel vapors are periodically purged from the fuel vapor recovery system into the air/fuel intake. The mixture of air fuel vapor and fuel inducted into the air/fuel intake is regulated by a feedback loop responsive to an exhaust gas oxygen sensor to maintain a desired air/fuel ratio. An indication of the fuel vapor concentration in the fuel vapor recovery system is provided to control various engine parameters and thereby reduce hydrocarbon emissions during the response time of the feedback loop. In one aspect of the invention, the flow rate of the purged fuel vapors is controlled to be in inverse relation to the concentration of purged fuel vapors during the response time of the feedback loop. In another aspect of the invention, the engine timing is retarded in relation to the concentration of purged fuel vapors during the response time of the feedback loop.

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SAE 82066, "Measurement and Improvement of the Transient A/F Characteristics of an Electronic Fuel Injection System", Hamburg et al., (1-1982).

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