JPH0363684B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a detection device for controlling ignition timing, fuel injection, etc. of an internal combustion engine, and particularly to a detection device that generates a predetermined pulse in synchronization with the rotation of a power distribution device. The present invention relates to a rotation angle detection device.

[Prior art]

The ignition timing of an internal combustion engine affects exhaust gas and fuel efficiency, and in order to set it to the optimum value, a power distribution device that rotates in synchronization with the internal combustion engine is generally used, and a centrifugal advance mechanism and negative pressure installed in this power distribution device are used. The ignition timing is controlled by an advance mechanism.

However, since the advance angle mechanism is a mechanical control system, its accuracy and responsiveness are poor, and therefore, control systems that eliminate these drawbacks using electronic circuits have come to be adopted. When controlling with an electronic circuit, various detection devices are required, and one important detection device is a crank angle rotation angle detection device.

As an example of this rotation angle detection device, a disc made of a magnetic material is rotated in synchronization with the crankshaft, a protrusion is provided in the circumferential direction of this disc, and magnetic flux changes with a magnetic pick-up facing the protrusion. There is a method of extracting the voltage as an alternating voltage and obtaining a predetermined pulse signal.

However, this method has the disadvantage that the space for the device for directly detecting the rotation angle of the crankshaft is limited. Furthermore, there is also the problem that malfunctions are likely to occur due to the influence of external magnetic fields, such as changes in magnetic flux caused by large currents flowing through the starting motor during startup, leakage magnetic flux from electromagnetic clutches for generators and car coolers, and the like.

For this reason, attempts have been made to eliminate the above-mentioned drawbacks by incorporating a photoelectric pickup and an electronic circuit into a power distributor that rotates in synchronization with the crankshaft to extract a predetermined pulse signal.

This method is described in, for example, Japanese Patent Laid-Open No. 56-92461.

In general, the pulse signal is composed of, for example, 360 angular position signals generated by a power distributor and 6 reference position signals generated in a 6-cylinder engine, and both signals are synchronized with each other.

That is, in order to extract rotation information of the crankshaft, angular position signal pulses within a predetermined time are counted, and the ignition timing is determined using a reference position signal.

[Purpose of the invention]

The present invention provides a structure in which the rotation angle detection device is efficiently housed in a power distribution device and has excellent assembly workability.

[Summary of the invention]

In order to achieve the above object, the present invention provides a shaft that rotates in synchronization with a crankshaft, a rotary plate that rotates integrally with the shaft, a photoelectric pickup that detects a signal using this rotary plate, and a photoelectric pickup that amplifies or The pickup includes an electronic circuit made of an hybrid integrated circuit that shapes a waveform, and the pickup includes a first holding member and a second holding member, and the lead of the light emitting element held by the first holding member and the second holding member. sandwiching the hybrid integrated circuit between the leads of the light-receiving element held by the
It is integrated and stored in the housing, and
The hybrid integrated circuit is electrically connected to a connector for external connection, and the connector is integrally formed with the second holding member and extended from the housing in parallel to the shaft. be.

According to the above configuration, the hybrid integrated circuit forming the detection device unit and the photoelectric pickup are integrated, and the connector is also integrally formed with the second holding member which is a part of the photoelectric pickup, so that it is compact. It can be made into a structure.

[Embodiments of the invention]

Embodiments of the present invention are shown in FIGS. 1 and 2.

1 is a shaft that rotates at half the engine speed in synchronization with the engine, 2 is a housing, and 3 is a bearing.

A first collar 4 is attached to one end of the shaft 1, and a pin 5 is press-fitted into a flange portion 4a of the collar 4. The pin 5 fits into a hole 7 provided in the flange portion 6a of the second collar 6.

A rotary plate 8 is installed between the flange parts 4a and 6a, and the second collar 6 and the first collar 4 are brought into pressure contact with the stepped part 1a of the shaft 1 with screws 9, and the rotary plate 8 is attached to both sides. It is held between the flange parts 4a and 6a.

13 is a first holding member that holds the light emitting element 23, and 10 is a second holding member that holds the light receiving element 24. 12 is an electronic circuit formed of a hybrid integrated circuit, and is electrically connected to the connector 11 for external connection. It is formed by the first holding member 13 and the second holding member 10, and includes a light emitting element 23 and a light receiving element 24.
The assembly of this and the electronic circuit 12 is called a photoelectric pickup 14, and the assembly of this and the electronic circuit 12 is called a detection device unit 15.

FIG. 2 shows an exploded perspective view of the detection device unit 15.

The leads 23a of the light emitting element 23 held by the first holding member 13 are connected to the hybrid integrated circuit 12a.
are connected to the leads 24a of the light receiving element 24, respectively. The second holding member 10 is a screw 21
It is integrated with the first holding member 13. The connector 11 includes a terminal 11a, and a second holding member 1
0 and is integrally molded with synthetic resin.

27 is the hybrid integrated circuit 12a and the terminal 11
This is a lead frame that electrically connects a.

A cover 20 covers the light emitting element 23 and the hybrid integrated circuit 12a.

The hole 22 provided in the second holding member 10 is a mounting hole for fixing to the housing 2, although not shown.

As described above, the structure in which the hybrid integrated circuit 12a is sandwiched between the lead 23a of the light emitting element 23 and the lead 24a of the light receiving element 24 allows electrical connection to be made by simply dipping it into a solder bath. Since the holding member 10 and the connector are integrated, the structure can be made compact.

In the embodiment, the mounting hole 22 provided in the second holding member 10 is used as a play hole, but it may also be a screw hole and the housing side may be used as a play hole and fixed with a screw. Further, the hole 22 or the screw hole may be formed by embedding a metallic member.

The hybrid integrated circuit 12a is sandwiched between the lead 23a of the light emitting element 23 and the lead 24a of the light receiving element 24, but a hole is provided in the substrate of the hybrid integrated circuit 12a, and the lead 23 is inserted into this hole.
a, 24a may be inserted.

〔Effect of the invention〕

As described above, according to the present invention, when incorporating a rotation angle detection device into a power distributor, the electronic circuit forming the detection device unit and the photoelectric pickup are integrated, and the connector is further integrated as a part of the photoelectric pickup. Because it is integrally formed with the second holding member,
Since the number of parts is small and the structure can be compact, it is possible to provide a rotation angle detection device that can be efficiently stored in a power distributor and has a structure that is easy to assemble.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view of a detection device unit. DESCRIPTION OF SYMBOLS 1... Shaft, 8... Rotating plate, 14... Photoelectric pickup, 12... Electronic circuit, 13... First holding member, 10... Second holding member, 11...
…connector.

Claims (1)

[Claims] 1 An electronic circuit consisting of a shaft that rotates in synchronization with the crankshaft, a rotating plate that rotates together with the shaft, a photoelectric pickup that detects signals using this rotating plate, and a hybrid integrated circuit that amplifies or shapes the waveform of this pickup signal. The pickup includes a first holding member and a second holding member, and the lead of the light emitting element held by the first holding member and the lead of the light receiving element held by the second holding member. The hybrid integrated circuit is sandwiched and integrated into a housing, and the hybrid integrated circuit is electrically connected to a connector for external connection, and the connector is integrally molded with the second holding member. The rotation angle detection device is characterized in that the rotation angle detection device is extended from the housing in parallel to the shaft.