JPH089396Y2 - Angle signal generator for ignition timing controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an angle signal generator in an ignition timing control device for an internal combustion engine.

[Prior Art] An angle signal generation device in an ignition timing control device for an internal combustion engine uses a rotor that rotates in conjunction with a crankshaft.
A signal that is a reference for ignition is generated near the top dead center of the piston. A multi-cylinder engine or the like requires two reference signals, and a single-cylinder engine may also require two signals. The conventional angle signal generator when the phase of the two reference signals is 180 degrees will be explained.
As shown in the figure, one protrusion 2 is provided on the outer circumference of the rotor 1,
Each time the rotor 1 is rotated 180 degrees by the two pulsars 3 and 3 provided at the symmetrical position on the outside of the rotor 1, the rising and falling signals are generated as shown in FIG. By shaping this with the waveform shaping circuits 4 and 4, a waveform as shown in FIG. 10 is obtained, and an angle signal serving as a reference for every 180 degrees is obtained and sent to the CPU 6 of the microcomputer 5 of the ignition timing control device. There are things that are designed to be done.

Further, as shown in FIG. 11, two or more protrusions 2'are provided on the outer periphery of the rotor 1, and in the illustrated example, four protrusions 2'are provided at equal angular intervals, and one or more protrusions 2'are missing. Alternatively, as shown in the drawing, one protrusion is changed to a protrusion 2 ″ having a wide angular width, and one pulsar 3 provided outside the rotor 1 is used to rotate the rotor 1 every 90 degrees. By generating rising and falling signals as shown in FIG. 12 and shaping the waveform by the waveform shaping circuit 4, an angle signal of the rotor 1 having a waveform as shown in FIG. 13 is obtained, which is the ignition timing control. There is a device in which the CPU 6 of the microcomputer 5 of the apparatus is sent to make the CPU 6 judge an angle signal which serves as a reference for every 180 degrees of the rotor 1. (As a prior art document, there is JP-A-59-163516). .) On the other hand, in the V-type engine, the phase of the two reference signals is x degrees. In the case of, a conventional angle signal generator will be described.
As shown in FIG. 14, one protrusion 2 is provided on the outer circumference of the rotor 1, and two pulsars 3, 3 are provided outside the rotor 1 at an angular interval of x degree. As shown in FIG. 10, the rising and falling signals are generated in the same manner as in FIG. 9 by the movement of the protrusion 2 by x degree by the rotation of the rotor 1 in FIG. 10, and the waveform shaping circuits 4 and 4 shape the waveform. In some cases, the same waveform is obtained, and a reference angle signal is obtained for each x degree and is sent to the CPU 6 of the microcomputer 5 of the ignition timing control device.

As another example of the conventional angle signal generator for a V-type engine, two or more protrusions 2'are provided on the outer periphery of the rotor 1 as shown in FIG. 15, and three protrusions 2'are provided in the illustrated example.
Are provided at equal angular intervals, and one or more of the protrusions 2 ′ are omitted, or one of them is changed to a protrusion 2 ″ having a wide angular width as shown, and one protrusion is provided outside the rotor 1. Each time the rotor 1 rotates by x degrees, the rising and falling signals are generated by the pulsar 3 in the same manner as in FIG. 12, and the waveform shaping circuit 4 performs waveform shaping to generate the same signal as in FIG. An angle signal of the rotor 1 having a different waveform is obtained, and this is sent to the CPU 6 of the microcomputer 5 of the ignition timing control device,
There is one in which the CPU 6 is made to judge the angle signal which becomes the reference for each x degree of the rotor 1.

[Problems to be Solved by the Invention] By the way, the angle signal generators shown in FIGS. 8 and 14 require two pulsars 3 and are expensive. Also,
The angle signal generator shown in FIG. 11 and FIG.
However, since the CPU 6 of the microcomputer 5 is made to judge the angle signal serving as a reference for every 180 degrees and every x degrees, the load of data processing of the CPU 6 becomes large.

Therefore, the present invention is to provide an angle signal generating device in an ignition timing control device in which a single pulser is used, and a reference angle signal for each required angle is obtained by waveform shaping of a single waveform shaping circuit. Is.

[Means for Solving the Problems] An angle signal generating device in an ignition timing control device of the present invention for solving the above problems is provided with a constant angle range on the outer circumference of a rotor that rotates in conjunction with a crankshaft of an internal combustion engine. An arc-shaped projection centered on the rotor center is provided over the rotor, and one pulser is provided outside the rotor, and the pulser is connected to one waveform shaping circuit connected to the CPU of the microcomputer of the ignition timing control device. It is characterized in that a plurality of holes are formed in the arc-shaped projection of.

[Operation] The angle signal generator of the present invention configured as described above is
When the rotor rotates and the protrusions on the outer circumference of the rotor pass through the pulsar, the pulsar rises and falls at a fixed angle, and this signal is sent to the waveform shaping circuit to be waveform shaped and fixed at a fixed angle. An angle signal that serves as a reference for each is obtained, and this is used by the microcomputer of the ignition timing control device.
Sent to CPU.

[Embodiment] An embodiment of the angle signal generator in the ignition timing control device of the present invention will be described with reference to FIG. 1. The outer periphery of the rotor 1 rotating in conjunction with the crankshaft of the internal combustion engine has an angle range of 180 degrees. A semicircular protrusion 7 centered on the center of the rotor 1 is provided over the rotor 1, and one pulsar 3 is provided outside the rotor 1.
And the pulser 3 is connected to the waveform shaping circuit 4 connected to the CPU 6 of the microcomputer 5 of the ignition timing control device.

In the angle signal generator configured as above, when the rotor 1 is rotated in conjunction with the crankshaft by the driving of the internal combustion engine and the semicircular protrusion 7 on the outer periphery of the rotor passes through the pulsar 3,
Pulsar 3 rises every 180 degrees as shown in Fig. 2,
A rising signal is generated, this signal is sent to the waveform shaping circuit 4 and the waveform is shaped, and an angle signal as a reference for every 180 degrees as shown in FIG. 3 is obtained. This angle signal is sent to the CPU 6 of the microcomputer 5 of the ignition timing control device,
The optimum ignition timing and energization time for each cylinder are calculated based on a map stored in the microcomputer 5 together with other control factors such as intake pressure, and an energization ignition signal is output from the output port to an igniter (not shown). Based on this, the ignition coil of each cylinder is energized / interrupted.

The semicircular protrusion 7 of the rotor 1 in the angle signal generator of the above embodiment is provided with a plurality of holes 8 as shown by the chain line to reduce the weight of the protrusion 7 and balance the rotation. To do so. Therefore, the rotor 1 obtained by the pulsar 3
The rotation angle signal of is highly accurate.

Next, another embodiment of the angle signal generating device in the ignition timing control device of the present invention will be described for a V-type engine. As shown in FIG. 4, in the V-type engine, the cylinders 10 facing each other are arranged at an angle of x degrees, the large ends of the piston rods 11 are connected to a common position of the crankshaft 12, and the pistons 13 of each cylinder 10 are connected. Crankshaft 12 is x at the top dead center and bottom dead center
It comes every time it rotates. In order to generate a signal serving as an ignition reference near the top dead center and the bottom dead center of the piston 13, the ignition signal generating device of the present invention is a rotor 1 shown in FIG. An arcuate projection 7'centered on the center of the rotor 1 is provided on the outer periphery of the rotor 1 over the angular range of x degree, and one pulsar 3 is provided outside the rotor 1.
And the pulser 3 is connected to the waveform shaping circuit 4 connected to the CPU 6 of the microcomputer 5 of the ignition timing control device.

In the angle signal generator thus configured, when the V-type engine is driven, the rotor 1 is rotated in conjunction with the crankshaft 12, and when the arc-shaped projection 7 ′ on the outer circumference of the rotor passes through the pulsar 3, the angle signal is generated every x degrees. The pulsar 3 generates a rising and falling signal as shown in FIG. 6, and this signal is sent to the waveform shaping circuit 4 and the waveform is shaped, which becomes the reference angle for each x degree as shown in FIG. The signal is obtained. This angle signal is sent to the CPU 6 of the microcomputer 5 of the ignition timing control device, and the optimum ignition timing and energization time are calculated for each cylinder based on the map stored in the microcomputer 5 together with other control factors, for example, intake pressure. The output port outputs an energization ignition signal to an igniter (not shown), and based on this, the ignition coil of each cylinder is energized and cut off.

Also in this embodiment, a plurality of holes 8 are formed in the arc-shaped projection 7'of the rotor 1 as shown by the alternate long and short dash line to form the projection 7 '.
Reduce the weight on the side to balance the rotation.
Therefore, the rotation angle signal of the rotor 1 obtained by the pulsar 3 becomes highly accurate.

[Advantage of Device] As described above, according to the angle signal generator in the ignition timing control device of the present invention, the rotor rotation angle signal is obtained by one pulser, and the angle signal is waveform-shaped by the waveform shaping circuit. Since a reference angle signal is obtained for each angle, the CP of the ignition timing controller microcomputer
In U, it is not necessary to judge the reference angle signal, so the data processing load on the CPU is small. Moreover, since only one pulser is required, the cost is reduced. Furthermore, by making multiple holes on the arc-shaped projection of the rotor, the weight on the projection side is reduced and the rotation can be balanced.
The rotor rotation angle signal obtained by the pulsar becomes highly accurate.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment of an angle signal generator in an ignition timing control device of the present invention, FIG. 2 is a chart of a rotor angle signal generated by a pulsar of the angle signal generator, and FIG. 3 is FIG. 2 is a chart diagram in which the angle signal of FIG. 2 is shaped, FIG. 4 is a conceptual diagram of a V-type engine, and FIG. 5 is another embodiment of the angle signal generator in the ignition timing control device for the V-type engine. FIG. 6 is a schematic diagram showing the angle signal of the rotor generated by the pulsar of the angle signal generator. FIG. 7 is a chart diagram in which the angle signal of FIG. 6 is waveform-shaped, and FIG. 8 is a schematic diagram of a conventional angle signal generator,
FIG. 9 is a chart of the angle signal of the rotor generated by the pulsar of the angle signal generator, FIG. 10 is a chart of the angle signal of FIG. 9 which is waveform-shaped, and FIG. 11 is a conventional angle signal of another method. Schematic diagram of the generator, FIG. 12 is a chart diagram of the angle signal of the rotor generated by the pulser of the angle signal generator, FIG. 13 is a chart diagram of the angle signal of FIG. 12 waveform-shaped, FIG. 14 and FIG. FIG. 15 is a schematic view of an angle signal generator in a conventional V-type engine. DESCRIPTION OF SYMBOLS 1 ... Rotor, 3 ... Pulsar 4 ... Waveform shaping circuit, 5 ... Microcomputer 6 ... CPU, 7 ... Semi-circular protrusion 7 '... Arc-shaped protrusion

Claims (1)

[Scope of utility model registration request] 1. An arc-shaped projection centered on the rotor center over a certain angular range is provided on the outer periphery of a rotor that rotates in conjunction with the crankshaft of an internal combustion engine, and one pulsar is provided outside the rotor. An angle signal generation in an ignition timing control device, characterized in that the pulser is connected to one waveform shaping circuit connected to a CPU of a microcomputer of an ignition timing control device, and a plurality of holes are formed in an arc-shaped projection of the rotor. apparatus.