JPS61140965U - - Google Patents

Description

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure shows an operation time chart of the circuit of FIG. 1 when the rotation speed is lower than the target rotation speed, and FIG. 3 shows an operation time chart of the circuit of FIG. 1 when the rotation speed is higher than the target rotation speed. 1: Rotation angle detector, 2: Waveform shaping circuit, 6: First retriggerable one-shot multivibrator, 7: Second retriggerable one-shot multivibrator, 8: Charge relay, 9
: Relay operation detection circuit, 10: NOR circuit, 11
: Hysteresis circuit.

Claims (1)

[Scope of utility model registration request] means for outputting a rotation angle pulse at every predetermined rotation angle of the internal combustion engine; means for detecting the operating state of a charge relay of a charging circuit associated with the internal combustion engine; a first retriggerable one-shot multivibrator that outputs a pulse with a time width approximately equal to the period of the rotation angle pulse corresponding to the number of rotation angles; a second retriggerable one-shot multivibrator that outputs a pulse with a time width longer than the cycle of the rotation angle pulse; and the target rotation is determined based on the output pulse of the second multivibrator and the operating state of the charge relay. A rotation speed determination circuit comprising: means for determining and outputting the magnitude of the rotation speed of the internal combustion engine with respect to the rotation speed of the internal combustion engine.