Communications: electrical – Selective – Having indication or alarm
Patent
1974-07-05
1976-04-06
Caldwell, John W.
Communications: electrical
Selective
Having indication or alarm
340414, B60Q 100
Patent
active
039493563
ABSTRACT:
Operating parameters of an engine, such as coolant temperature, oil pressure, air filter flow and the like, are continuously monitored by an electrical circuit responsive to sensor switches. The circuit distinguishes between conditions which require immediate correction, such as low oil pressure for example, and conditions such as reduced porosity of the air filter which need not necessarily be corrected immediately but which should be attended to at the end of the current vehicle operation. The two types of conditions are signalled to the operator by different means and the signalling means for noncritical conditions remains latched on after the engine has been shut down to alert maintenance personnel to the need for corrections. Means are provided for selectively testing the system, for discriminating against nonsignificant, brief, actuations of a sensor switch and for selectively turning off signalling means which have been latched on.
REFERENCES:
patent: 3084338 (1963-04-01), Mauer et al.
patent: 3509529 (1970-04-01), Utter
patent: 3566401 (1971-02-01), Smith et al.
patent: 3626367 (1971-12-01), Howard et al.
patent: 3723964 (1973-03-01), Lace
patent: 3798596 (1974-03-01), Sumiyoshi et al.
Freedy Allan L.
Fuzzell Joe E.
Caldwell John W.
Caterpillar Tractor Co.
Nowicki Joseph E.
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