Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1997-06-20
1998-10-06
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
060277, 123697, 219497, G01N 27416, F02D 4114
Patent
active
058162313
ABSTRACT:
An apparatus controls power supplied to a heater of an air-fuel-ratio sensor in consideration of the radiant heat from a catalytic converter. A map showing a relationship between power supplied to the heater and engine operating conditions is prepared on the assumption that radiant heat from the converter never affects the temperature of the sensor. Another map showing the same relationship is prepared on the assumption that radiant heat from the converter, which is new, affects the temperature of the sensor. A difference .DELTA.Qij=Q2ij-Q1ij is calculated under the same engine operating conditions, where Q1ij is power supplied to the heater with radiant heat from the converter affecting the temperature of the sensor and Q2ij is power supplied to the heater with radiant heat from the converter not affecting the temperature of the sensor. At the same time, a deterioration index DR of the converter is calculated. The deterioration index DR is used to determine a coefficient .alpha.. The target power Qij supplied to the heater is calculated as Qij=Q2ij-.alpha..times.(Q2ij-Q1ij). Namely, the difference .DELTA.Qij is multiplied by the coefficient .alpha., and the product is subtracted from Q2ij, to provide the target power Qij.
REFERENCES:
patent: 4561402 (1985-12-01), Nakano et al.
patent: 5656190 (1997-08-01), Aoki
Argenbright Tony M.
Toyota Jidosha & Kabushiki Kaisha
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