Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1980-07-18
1981-07-14
Myhre, Charles J.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123437, 123438, 73 26, F02M 700, F02B 300, F02B 7510
Patent
active
042780608
ABSTRACT:
A feedback type air fuel ratio controlling system for detecting and controlling an exhaust gas composition of an engine. A gas sensor provides a sensor signal related to an exhaust gas concentration. This sensor signal is coupled through an automatic gain control (AGC) DC level amplifier to a deviation detector. The deviation detector compares the signal to a reference signal V.sub.p representing a stoichiometric air fuel mixture and provides a correction signal for adjusting the engine's air fuel ratio. The AGC DC level amplifier provides automatic DC level compensation for a slowly deteriorating sensor and, working in combination with the deviation detector, an AC hysteresis response for judging rich to lean and lean to rich changes sensed by the exhaust gas sensor. When the output of the exhaust gas sensor varies slowly with respect to the time constant of the AGC DC amplifier, as with a deteriorating sensor, the DC level of the output voltage of the AGC DC amplifier is maintained substantially at a predetermined reference level Vs if the sensor signal coupled to the AGC DC amplifier is within a predetermined range. However, when the exhaust gas sensor output varies at a rate consistent with the time constant of the AGC DC level amplifier, a rich to lean change of the total air fuel ratio is detected at an earlier point in time than it would otherwise be detected in the absence of the AGC DC level amplifier by decreasing the gain of the AGC DC level amplifier and a lean to rich change of the total air fuel ratio is detected at an earlier point in time than it would otherwise be detected in the absence of the AGC DC level amplifier by increasing the gain of the AGC DC level amplifier.
REFERENCES:
patent: 3831564 (1974-08-01), Schmidt et al.
patent: 4131091 (1978-12-01), Asano et al.
patent: 4153023 (1979-05-01), Asano et al.
patent: 4203394 (1980-05-01), Aono et al.
Isobe Toshiaki
Yokoyama Tatsuo
Myhre Charles J.
Nelli R. A.
Toyota Jidosha Kogyo Kabushiki Kaisha
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