Method for protecting a catalyzer

Details Method for protecting a catalyzer Method for protecting a catalyzer

1991-01-22

1991-12-24

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

60274, 60277, 123198D, F01N 900, F01N 318, F02D 4122, F02D 4300

Patent

active

050742701

ABSTRACT:
The invention is directed to a method for protecting a catalyzer against overheating. The method includes the steps of checking whether an injection valve no longer correctly closes by means of a conventional diagnostic process. If the condition is present that an injection valve no longer correctly closes, the air/fuel mixture for all cylinders is enriched and an overrun switchoff is inhibited. The method leads to the condition that in all load ranges, the oxygen quantity reaching the catalyzer is limited so that no damaging afterburning can take place. In this way, the catalyzer is protected against overheating and the affected vehicle is not disabled.

REFERENCES:
patent: 4036196 (1977-07-01), Hamilton
patent: 4192140 (1980-03-01), Yamashita et al.
patent: 4319451 (1982-03-01), Tajima et al.
patent: 4467757 (1984-08-01), Dazzi
patent: 4499876 (1985-02-01), Yamamoto

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