System and method to control energy supply to an electrically he

Details System and method to control energy supply to an electrically he System and method to control energy supply to an electrically he

1985-08-27

1987-06-02

Wolfe, Jr., Willis R.

Internal-combustion engines

Starting device

For airplane

123179H, 123145A, 219497, 219509, F02P 1902, G05D 2319

Patent

active

046694307

ABSTRACT:
Electrical energy being supplied to an electrical heater, typically a glow plug within an internal combustion engine (ICE), is easily and simply controlled by controlling the duty cycle or ON/OFF duration of a switch (10) serially connected between the glow plug (11) and a supply voltage source, for example a vehicular battery (U.sub.Batt). An operational amplifier (15) controls the duty cycle of the switch (10) by comparing a periodically varying voltage (37a) derived from a stabilized frequency or pulse generator (30) with battery voltage (U.sub.Batt) and, at the cross-over points, respectively changing the switching condition of the switch. Upon drop in battery voltage, the switch will be longer in an ON position than at a higher battery voltage, so that the average voltage, over a plurality of cycles, across the glow plug (11), will have a value (U.sub.KEM) which will result in a predetermined temperature thereof.

REFERENCES:
patent: 4300491 (1981-11-01), Hara et al.
patent: 4307689 (1981-12-01), Raeske et al.
patent: 4458639 (1984-07-01), Abe et al.
patent: 4516543 (1985-05-01), Abe et al.

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