JPH04339174A - Distributor internally provided with crank angle sensor - Google Patents

Abstract

PURPOSE:To always monitor the output signal of a light receiving element, in a light receiving IC mixedly providing a light receiving element and a waveform shaping circuit on a same silicon chip. CONSTITUTION:A light receiving IC 20 mixedly providing a light receiving element 3 and a waveform shaping circuit 15 on a same silicon chip is provided, and an outer terminal 20d capable of monitoring the output signal of the light receiving element 3 is provided on this light receiving IC 20.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a power distributor with a built-in crank angle sensor, and more particularly to a power distributor with a built-in crank angle sensor that is housed together with a crank angle sensor in the same housing and obtains a signal for controlling the ignition timing of an internal combustion engine. It is something.

0002

2. Description of the Related Art FIG. 4 is a block diagram showing a conventional power distributor with a built-in crank angle sensor. In FIG. 4, a light emitting element 2, for example, a light emitting diode, embedded in a mold package 1, and a light emitting element 3, for example, a photodiode, provided in a light receiving IC 10, which will be described later, are arranged facing each other. Light emitting element 2 and light receiving element 3 in the light receiving IC 10
Each has a fixing slit 4 on the front.
An opening of a rotating disk 6 fixed to the power distribution shaft 5 is configured to pass between the fixed slits 4. Further, the output side of the light receiving IC 10 is connected to the output terminal 7.

FIG. 5 shows a circuit configuration used in a conventional power distributor with a built-in crank angle sensor, and parts corresponding to those in FIG. 4 will be described with the same reference numerals. In FIG. 5, 11
is a battery, which is connected to the anode of the light emitting element 2 via a resistor 12 and to the cathode of the light receiving element 3 via a resistor 13. The anode of the light receiving element 3 is grounded via a load resistor 14 and connected to a non-inverting input terminal of a comparator 15, and a reference voltage Vref is applied to the inverting input terminal of the comparator 15. A pull-up resistor (1
6) is connected, and a Zener diode 17 is connected between one end of the resistor 13 and the ground.

Next, the circuit operation of the conventional power distributor with a built-in crank angle sensor shown in FIG. 5 will be explained. When the disk 5, which has an opening at a predetermined angle, rotates and passes through the gap between the light emitting element 2 and the light receiving element 3, which are arranged facing each other at a constant distance by the mold package 1, light emitted from the light emitting element 2 of light is passed through and blocked. When light passes through, a photocurrent I flows through the light receiving element 3, and the resistance value R
VA=R as shown in FIG.
A voltage like I is generated. This voltage is supplied to the comparator 15 and compared with the reference voltage Vref, and is waveform-shaped to obtain a rectangular waveform output signal VB with a peak value VCC having an angular width Q as shown in FIG. 6 on the output side. . This output signal VB is then used as a signal for controlling the ignition timing of the internal combustion engine.

The light receiving IC 10 is an IC chip in which a light receiving element 3 and a waveform shaping circuit including a comparator 15 and the like are mixed together housed in a single metal package. As shown, it has a power terminal 10a, a ground terminal 10b, and an output terminal 10c. The light receiving IC 10 is directly mounted on a substrate (not shown) on which a power supply resistor and the like are mounted.

[0006]

[Problems to be Solved by the Invention] Since the conventional power distributor with a built-in crank angle sensor is configured as described above, the light emission output of the light emitting element 2, the sensitivity of the light receiving element 3, and the load resistor 1 are
4, the potential at the connection point P varies due to variations in the resistance value of V. As a result, as shown by the chain line in FIG. 6, the output signal V
There was a problem in that the angular width of B and the rising and falling edge positions fluctuated, resulting in detection errors. In addition, in Fig. 5, the light receiving element 3 is used with a reverse bias, but in this case, a leakage current called dark current occurs even when no light is received, and this dark current is The problem is that when the dark current is large, the angular width of the output signal VB becomes large, and in the worst case, the DC level exceeds the reference voltage Vref and no output signal is generated. was there. This invention was made to solve the above-mentioned problems, and aims to provide a power distributor with a built-in crank angle sensor that eliminates detection errors and can deal with dark current.

[0007]

[Means for Solving the Problems] A power distributor with a built-in crank angle sensor according to the present invention includes a light receiving IC in which a light receiving element and a waveform shaping circuit are mixed in a single silicon chip, and an output of the light receiving element is provided to the light receiving IC. It is equipped with an external terminal that can monitor the signal.

[0008]

[Operation] In this invention, by providing the photodetector IC with an external terminal that can monitor the output signal of the photodetector, the photocurrent from the photodetector can be adjusted to keep the angular width of the output signal of the photodetector IC constant; , it becomes possible to select light-receiving elements with large dark current.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of the present invention,
1 to 6 are the same as described above. In this embodiment, a light receiving IC 20 having an external terminal capable of monitoring the output signal of the light receiving element 3 is used in place of the conventional light receiving IC 10.

FIG. 2 shows a circuit configuration used in the power distributor with a built-in crank angle sensor according to the present invention. Parts corresponding to those in FIG. 5 are denoted by the same reference numerals, and detailed explanation thereof will be omitted. In addition to the power supply terminal 20a, the ground terminal 20b, and the output terminal 20c, the light receiving IC 20 has an external terminal 20d that is connected to the anode of the light receiving element 3 and whose output signal can be monitored. The arrangement is as shown in FIG. By providing this external terminal 20d,
The output signal of the light receiving element 3 can be constantly monitored, for example, the light emission output of the light emitting element 2, the sensitivity of the light receiving element 3, and the load resistor 14.
Even if there is a variation in the potential of the connection point P due to variation in the resistance value of As a result, the angular width Q of the output signal VB of the comparator 15 can be kept constant, and detection errors can be eliminated. Also, without applying light to the light receiving element 3, the dark current is transferred to the external terminal 20d.
By further monitoring, the magnitude of the dark current of the light receiving element 3 can be confirmed, and if the dark current is larger than a predetermined value, it becomes possible to select the light receiving element 3, such as replacing it.

[0011]

As described above, according to the present invention, a light receiving IC is provided in which a light receiving element and a waveform shaping circuit are mixed in a single silicon chip, and the light receiving IC has an external terminal that can monitor the output signal of the light receiving element. Since this is provided, detection errors due to variations in light-receiving sensitivity etc. can be removed, the light-receiving elements can be selected, and a power distributor with a built-in crank angle sensor that can always maintain normal operation can be obtained.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an embodiment of the present invention.

FIG. 3 is a side view and a bottom view showing essential parts of the invention.

FIG. 4 is a configuration diagram showing a conventional power distributor with a built-in crank angle sensor.

FIG. 5 is a circuit diagram showing a circuit configuration used in a conventional power distributor with a built-in crank angle sensor.

FIG. 6 is a waveform diagram for explaining the operation of FIG. 5;

FIG. 7 is a side view and a bottom view showing a conventional light receiving IC.

[Explanation of symbols]

1 Mold package 2 Light emitting element 3 Photo receiving element 4 Power distributor shaft 5 Disc 20 Photodetector IC 20d External terminal for monitor

Claims (1)

[Claims] 1. A light emitting element and a light receiving element are arranged opposite to each other in a molded package, and an opening at a predetermined angle is formed, and the light emitting element and the light receiving element are rotated together with a power distribution shaft to pass through the gap between the light emitting element and the light receiving element. disk and
A power distributor with a built-in crank angle sensor, which includes a waveform shaping circuit that shapes the output signal of the light receiving element, includes a light receiving IC in which the light receiving element and the waveform shaping circuit are mixed in a single silicon chip; A power distributor with a built-in crank angle sensor, characterized in that a light receiving IC is provided with an external terminal capable of monitoring an output signal of the light receiving element.