Air/fuel ratio control with adaptive learning of purged fuel vap

Details Air/fuel ratio control with adaptive learning of purged fuel vap Air/fuel ratio control with adaptive learning of purged fuel vap

1990-12-03

1992-02-25

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123520, F02D 4114, F02M 2508

Patent

active

050903888

ABSTRACT:
A system and method for controlling operation of an engine wherein a fuel vapor recovery system is coupled between an air/fuel intake and a fuel supply system. An air/fuel ratio indication is provided by a proportional plus integral feedback controller coupled to a two-state exhaust gas oxygen sensor. In response to the air/fuel ratio indication and a measurement of inducted air flow, a base fuel command is generated. To compensate for purging of fuel vapors, a reference air/fuel ratio is subtracted from the air/fuel ratio indication and the resulting error signal generated. This compensation factor represents a learned value which is directly related to fuel vapor concentration, and it is subtracted from the base fuel command to correct for induction of fuel vapors.

REFERENCES:
patent: 4467769 (1984-08-01), Matsumura
patent: 4641623 (1987-02-01), Hamburg
patent: 4715340 (1987-12-01), Cook et al.
patent: 4741318 (1988-05-01), Kortge et al.
patent: 4748959 (1988-06-01), Cook et al.
patent: 4967713 (1990-11-01), Kojima

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