Internal-combustion engines – Noncompression
Patent
1977-05-23
1979-02-20
Myhre, Charles J.
Internal-combustion engines
Noncompression
123 32EA, 60276, 60285, F02B 308, F01N 308
Patent
active
041400852
ABSTRACT:
A method and apparatus for use with fuel mixture preparation systems which employ an oxygen sensor in the exhaust line to determine the composition of the combustible mixture supplied to the engine and which adjust the mixture on the basis of the bi-valued signals from the sensor. In order to permit the use of these signals at lower than normal operating temperatures, where the internal resistance of the sensor is high and the output signal is skewed, the invention proposes generating a correction current which is passed through the sensor and which causes a voltage drop which symmetrizes the output voltage so that the two branches of the output signal always lie respectively above and below a fixed set-point voltage, thus permitting control loop processing.
A circuit is also described which supplies the correcting current by comparison of the DC level of the output signal with the set-point value in a secondary feedback loop.
REFERENCES:
patent: 3745768 (1973-07-01), Zechnall et al.
patent: 3831564 (1974-08-01), Schmidt et al.
patent: 3911884 (1975-10-01), Moriya et al.
patent: 4007589 (1977-02-01), Neidhard et al.
patent: 4029061 (1977-06-01), Asano
Rabus Friedrich
Schweizer Hartmut
Greigg Edwin E.
Lall P. S.
Myhre Charles J.
Robert & Bosch GmbH
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