JPS61199615U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1A is an overall diagram of an ignition timing control device using a reference position signal generator according to a first embodiment of this invention;
FIG. 1B and FIG. 1C are a plan view and a partially sectional side view of the reluctor of this embodiment, respectively. FIG. 2 is a plan view of the reluctor to explain the relationship between the reluctor shape and output voltage characteristics, FIGS. 3 and 4 are diagrams illustrating the case where the outer periphery and groove of the reluctor face the stator, respectively, and FIG. The figure is an output voltage waveform diagram obtained with the reluctor shape shown in FIG. 2. 6th
The figure shows the output (REF) generated in the pickup coil when the reluctor of the embodiment shown in FIG.
signal) and the output generated in the pickup coil (P
FIG. 4 is a waveform diagram showing the OS signal. Fig. 7A shows a conventional reluctor, Fig. 7B shows a reluctor equipped with a detection piece for group cylinder discrimination, and Fig. 7C shows a reluctor whose outer periphery is a perfect circle, with a reluctor for generating a reference position signal every 90°. FIGS. 8A to 8C are plan views of a reluctor configured with a protruding detection piece and a detection piece for group cylinder discrimination; FIGS.
7C is an output waveform diagram for FIG. 7C; FIG. Figure 9 shows the POS signal and F/V in the operating range where the engine speed is low and the rotational fluctuation is large due to the reluctor in Figure 7C.
FIG. 3 is a waveform diagram showing a signal and a REF signal. FIG. 10 is a plan view of a reluctor according to a second embodiment of this invention. FIG. 11A is a schematic configuration diagram of an ignition timing control device using a conventional device, and FIGS. 11B and 11C are a plan view and a side view of the conventional device. 12A and 12B are respectively a perspective view and a plan view of other conventional devices, FIG. 12C is an output voltage waveform diagram obtained with the reluctor shape of the conventional device, and FIGS. 13 and 14 are respectively relative spatial distance between reluctor and stator,
It is a figure explaining the case where this spatial distance is the minimum. 20...Ring gear sensor, 21...Ring gear, 25...Camshaft, 26...Rotating shaft, 28...
Reluctor, 29...Reference position groove, 30, 30
A... Groove for group cylinder discrimination, 32... Stator, 33... Magnetic plate, 35... Engine body, 37... Pick-up coil, 40... Signal processing circuit, 45... Control unit, 5
0...Electronic power distribution type ignition means.

Claims (1)

[Scope of utility model registration request] A crank angle consisting of a rotating body fixed to a rotating shaft that rotates in synchronization with the crankshaft, a stator that faces this rotating body with a predetermined gap in between, a permanent magnet that magnetizes this stator, and a pick-up coil. 2. A reference position signal generating device for crank angle, characterized in that an outer peripheral portion of the rotating body is formed to have a perfect circular cross section, and grooves are bored in the outer peripheral portion at predetermined angle intervals.