US 4,744,747 AGranted

Heater controller

AssigneeIsuzu Motors Limited

InventorsHideo Kawamura, Keiichi Yamashita, Yukio Yoshida

Life of this patent

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Abstract

A controller for a heater has two switch circuits for controlling the supply of electric power to an atomizing glow plug for atomizing fuel and an ignition glow plug for igniting atomized fuel, the glow plugs being connected parallel to each other. One of the switch circuits includes a series-connected resistor for producing a voltage drop thereacross. During an inital period of operation of the heater, the first switch circuit free of the series-connected resistor is turned on to heat the glow plugs quickly up to respective prescribed temperatures for atomizing and igniting the fuel. Upon elapse of a predetermined period of time, during which the prescribed temperatures are reached, the first switch circuit is turned off and the second switch circuit with the series-connected resistor is turned on to keep the glow plugs at the prescribed temperatures without further heating them.

Claims5

Dependent claims

A controller for controlling a heater including a burner having an atomizing glow plug for heating and atomizing fuel and an igniting glow plug for igniting the fuel which has been heated and atomized by the atomizing glow plug, said controller comprising:

a first switch for supplying electric power to said atomizing glow plug and said igniting glow plug which are connected in parallel with each other;
a second switch connected in parallel with said first switch and in series with a resistor for producing a voltage drop there across;
a combustion sensor for sensing temperature inside said burner;
and
means for closing said first switch and, upon elapse of a predetermined period of time, opening said first switch and closing said second switch, and for cutting off supply of electric power to said atomizing glow plug and said igniting glow plug when the temperature inside said burner sensed by said combustion sensor has reached a predetermined value.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/945,865Filed 23 Dec 1986
Priority: JP 60-29012323 Dec 1985
Granted: 17 May 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B60H 1/2206
The heat being derived from burners: controlling the operation of burners
F23N 5/203
With a time program acting through electrical means, e.g. using time-delay relays: using electronic means
G05D 23/1919
Characterised by the use of electric means: characterised by the type of controller
G05D 23/24
With sensing elements having variation of electric or magnetic properties with change of temperature: the sensing element having a resistance…