Electric heating – Heating devices – With current connection and/or disconnection means
Patent
1980-02-04
1982-11-02
Paschall, M. H.
Electric heating
Heating devices
With current connection and/or disconnection means
219504, 219505, 219486, 219202, 219519, 219508, 123179H, 337102, 337104, H05B 102, F02N 1700
Patent
active
043575250
ABSTRACT:
A control for modulating the duty cycle of diesel engine glow plugs has two heat sensitive, normally closed switches each thermally coupled to a respective positive temperature coefficient (PTC) of resistivity heater in turn thermally coupled to and mounted on a common heat sink. The heat sensitive switches are serially connected to each other, to an ignition switch and to a glow plug relay. The PTC heaters are connected to a point between the heat sensitive switches and the relay and to ground. A third PTC heater is mounted on the heat sink intermediate the first and second heaters and thermally coupled to the heat sink. The third heater is connected to an alternator and serves to cut off power to the glow plugs after a selected after glow stage. The two heat sensitive switches can be selected to open at approximately the same temperature for a random operating mode or at slightly different temperatures for a sequential operating mode. The random operating mode is a redundant high reliability operating mode whereas the sequential operating mode, using slightly different temperatures allows one switch to control the cycling and the second to be a back up safety control. In one preferred embodiment a "wait" lamp is connected between the ignition switch and a double pole relay used to latch the lamp in the deenergized state when the first "off" time of the heat sensitive switches occurs. In a second embodiment the "wait" lamp is connected between the alternator and the coil of the glow plug relay with a diode serially connected to the lamp to preclude alternator current from energizing the lamp.
REFERENCES:
patent: 3748439 (1973-07-01), Ting et al.
patent: 4104507 (1978-08-01), Tisone et al.
patent: 4177785 (1979-12-01), Sundeen
patent: 4201735 (1980-05-01), Byam
Haug John A.
McAndrews James P.
Paschall M. H.
Sharp Melvin
Texas Instruments Incorporated
LandOfFree
Glow plug duty cycle modulating apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Glow plug duty cycle modulating apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Glow plug duty cycle modulating apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-625686