Measuring and testing – Vehicle chassis – Steering
Patent
1985-09-16
1987-01-27
Levy, Stewart J.
Measuring and testing
Vehicle chassis
Steering
123440, G01M 1500, F02M 700
Patent
active
046386580
ABSTRACT:
A method of detecting an abnormality in a system for detecting the concentration of an ingredient contained in exhaust gases emitted from an internal combustion engine, including a sensor for detecting the same concentration, wherein a correction value for the air-fuel ratio of a mixture being supplied to the engine is set in response to an output signal from the sensor, the correction value thus set being applied in detecting the abnormality. A first predetermined value and a second predetermined value smaller than the first predetermined value are set, which both lie within a first range defined by an upper limit value of the correction value and a lower limit value of same that can be assumed when the engine is in normal operating conditions. When the correction value continues to fall outside a second range defined by the first predetermined value and the second predetermined value over a limited period of time, it is determined that the system for detecting the exhaust gas ingredient concentration including the sensor is abnormal.
REFERENCES:
patent: 4254744 (1981-03-01), Mizote
patent: 4364359 (1982-12-01), Otsuka et al.
patent: 4542728 (1985-09-01), Otobe et al.
patent: 4542729 (1985-09-01), Yamato et al.
Honda Giken Kogyo K.K.
Lessler Arthur L.
Levy Stewart J.
Raevis Robert R.
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