| 摘要 |
PURPOSE:To permit a glow plug to be always supplied with a constant electric power, even if a battery voltage fluctuates, by controlling an interrupting switch according to the output signal from a comparator for comparing output signals from a smoothing circuit and a calculation circuit with each other, in a glow- plug controller. CONSTITUTION:One terminal of a starting switch 2 is connected to the input terminal 301 of a glow-plug controller 3, and the other terminal is connected to the input terminal 302 of the apparatus 3, and the output terminal 303 of the apparatus 3 is connected to one edge of a glow plug 4, and an interrupting switching element 304 is connected to the input terminal 301. A smoothing circuit 306 smoothes the output pulse of the interrupting switching element 304 and converts said pulse into analog voltage V1, and a calculation circuit 307 calculates 1/V from the voltage V of a battery 1, and outputs an analog voltage V2. The output voltages of the both circuits described in the above V1 and V2 are compared in a comparator 308, and if V2>=V1, said output generates a high-level signal, and if V2<V1, a low-level signal is generated, in order to control the interrupting switch 304, and a constant electric power is always supplied to the glow plug 4. |
