Air/fuel ratio control system and method for fuel vapor purging

Details Air/fuel ratio control system and method for fuel vapor purging Air/fuel ratio control system and method for fuel vapor purging

1990-12-05

1991-09-17

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

123520, F02M 2508

Patent

active

050484923

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. At initiation of fuel vapor purging, the rate of purge flow is incremented a predetermined amount with each change in state of the exhaust gas oxygen sensor.

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patent: 4932386 (1990-06-01), Uozumi et al.
patent: 4967713 (1990-11-01), Kojima

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