Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1991-07-22
1992-10-27
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, F01N 320
Patent
active
051579197
ABSTRACT:
An on-board catalytic converter efficiency monitoring system uses an exhaust gas oxygen sensor downstream of a converter to enable closed loop air-fuel ratio control. The period of the air-fuel limit cycle is used to determine a time constant parameter of the feedback loop. A parameter in the fuel controller is changed to induce another air-fuel limit cycle frequency. The period of this new air-fuel limit cycle provides additional information with respect to the time constant of the feedback loop. Because it is possible to make other changes to the parameters of the fuel controller, different frequencies can be induced and additional parameters of the feedback loop time constant can be determined. With n different frequencies produced by n different fuel controller parameters it is possible to solve for n different time constants. The system can be used with either one or two EGO sensors depending upon the desired parameter to be solved. It is particularly advantageous to use one EGO sensor downstream of a converter to determine the catalytic efficiency.
REFERENCES:
patent: 4007589 (1977-02-01), Neidhard et al.
patent: 4130095 (1978-12-01), Bowler
patent: 4622809 (1986-11-01), Abthoff et al.
Abolins Peter
Ford Motor Company
Hart Douglas
May Roger L.
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