Internal-combustion engines – Noncompression
Patent
1977-08-22
1979-02-20
Myhre, Charles J.
Internal-combustion engines
Noncompression
123 32EA, 60276, 60285, F02M 700
Patent
active
041400860
ABSTRACT:
An apparatus for use in association with a fuel mixture preparation system for an internal combustion engine in which the output signal from an oxygen sensor located in the exhaust system is used to provide closed-loop control of the mixture ratio supplied by the mixture preparation system. The apparatus includes a principal comparator in which the sensor signal is compared with a reference value and a subsequent integrator which supplies correcting signals to the mixture controller. A special circuit between the principal comparator and the integrator can delay the signal transmission between these two elements in one direction of change, thereby causing an effective shift of the point of operation of the control loop to a different point in the sensor output curve, to compensate for aging, etc. The feedback branch of the integrator includes circuitry which effectively provides two different constants of integration to enhance smooth running at low engine speeds and to improve the control response at high engine speeds. The invention may be used with any kind of mixture preparation system, e.g., carburetors, intermittent injection systems and continuously acting injection systems.
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Drews Ulrich
Schnurle Hans
Singer Erich
Greigg Edwin E.
Myhre Charles J.
Nelli R. A.
Robert & Bosch GmbH
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