Method and apparatus for monitoring and adjusting .lambda.-probe

Details Method and apparatus for monitoring and adjusting .lambda.-probe Method and apparatus for monitoring and adjusting .lambda.-probe

1985-04-08

1986-11-18

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, F01N 320

Patent

active

046228098

ABSTRACT:
A method for testing and adjusting catalytic exhaust gas emission control systems of internal combustion engines, in which the fuel-air-ratio is regulated by means of a .lambda.-probe (control-probe) arranged in the exhaust gas stream upstream of the catalyst, whereby the exhaust gas stream is measured downstream of the catalyst by means of a further .lambda.-probe (test-probe). The voltage average value and amplitude magnitude of the signal produced by the test-probe are determined and serve for adjusting the operating point of the control system and for the recognition of the catalyst efficiency.

REFERENCES:
patent: 4007589 (1977-02-01), Neidhard
patent: 4251989 (1981-02-01), Norimatsu

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