JP2582759Y2 - Engine tachometer with timing light - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tachometer for an engine with a timing light, which is used for measuring the number of revolutions of an engine and measuring the ignition timing of the engine.

[0002]

2. Description of the Related Art Conventionally, in order to measure the engine speed, a dedicated engine tachometer has been prepared to measure the engine speed. In order to check the ignition timing of the engine, a dedicated timing light was prepared to check the ignition timing of the engine.

[0003] When measuring the engine speed and the ignition timing of the engine, an engine tachometer and a timing light are separately prepared, and fine adjustment of the engine and the like are performed while separately using them. Had to do the work.

[0004]

However, in such a conventional method of measuring the number of revolutions of the engine or the method of measuring the ignition timing, the conventional method for measuring the rotational speed of the engine or the method for measuring the ignition timing is so arranged that each of them is performed separately.
The engine has to be finely adjusted, and the work for each measurement and the fine adjustment of the engine are complicated and inefficient.

Further, in order to measure the engine speed and the ignition timing of the above-mentioned engine, it is necessary to prepare separate measuring devices independently of each other. As a result, there is a problem that the cost is increased. . This invention has been made in view of the conventional problems as described above. The engine tachometer and the timing light are integrated in one housing, and the engine is selected while selecting a plurality of measurement modes by an external switch. It is an object of the present invention to provide an engine tachometer with a timing light capable of selectively and reliably measuring a rotation speed and / or an ignition timing of an engine and realizing the measurement with a simple and inexpensive configuration.

[0006]

An engine tachometer with a timing light according to the present invention has a waveform shaping circuit for shaping an output pulse from a sensor into a square wave, and an engine based on the output pulse of the waveform shaping circuit. A microcomputer for calculating the number of rotations, a display for displaying the number of engine rotations calculated by the microcomputer, and a pulse synchronized with the engine rotation in the low / medium speed range based on the output pulse of the sensor unit; An internal processing circuit for obtaining an appropriate number of output pulses in the rotation range;
Based on the output pulse obtained by the internal processing circuit, the light-emitting circuit causes the light-emitting element to blink the light-emitting element, and determines whether the mode of measuring the engine speed, the mode of the blinking operation of the light-emitting element, or the combined mode using both of these modes is used. Is switched to a first push button switch, the engine rotation measurement function is switched by a second push button switch according to various engines, and by switching the first push button switch,
The signal from the sensor section is converted to the waveform shaping circuit or /
And the internal processing circuit.

[0007]

The engine tachometer with a timing light according to the present invention first sets a first push button switch to a combined mode of, for example, an engine speed measurement mode and a light emitting element blinking operation mode as a timing light mode. Further, a two-cycle single cylinder is selected by the second push button switch.

Accordingly, the microcomputer outputs an output signal corresponding to the statuses of the first and second push-button switches to the switching selector, and based on the output signal, the engine tachometer and the timing light are switched in the switching selector. By operating the internal changeover switch so that the signals can be used together, the signal from the sensor section is transmitted to the waveform shaping circuit, and the other is transmitted to the internal processing circuit of the timing light through the changeover selection section.

The waveform shaping circuit shapes the signal from the sensor section into a rectangular pulse signal, and the microcomputer receiving the rectangular pulse signal generates a two-cycle single cylinder based on the rectangular pulse signal. Is calculated and the calculation result is output to the display.

On the other hand, in the case of the timing light, the signal from the sensor section is transmitted to the internal processing circuit through the switching selection section, and the internal signal circuit rotates in the low / medium-speed rotation range based on the signal of the sensor section. In the high-speed rotation range, an appropriate number of blinking pulse signals are output to the light emitting circuit as output pulses.

For this reason, a flashing pulse signal from the internal processing circuit is received, and a light-emitting element such as a xenon tube is turned on and off, so that the ignition timing of the engine can be measured.

By operating the first and second push button switches, the operation of the engine tachometer alone, the operation of the engine tachometer only,
It is also possible to switch to the operation of only the timing write.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a perspective view showing an engine tachometer with a timing light according to an embodiment of the present invention.
FIG. 3 is a block diagram showing an engine tachometer with a timing light according to an embodiment of the present invention.

In these figures, 1 is a main body integrating the functions of an engine tachometer and a timing light and a housing, and 2 is a spark plug cable 7 of the engine.
It is a sensor unit that detects the ignition pulse by electromagnetic induction action.

Reference numeral 3 denotes an LC indicating the engine speed.
A display such as D, 4a is a lens for a light emitting element provided in a xenon tube or the like of a light emitting circuit 4 constituting a timing light, 5 is a first push button switch for switching a measurement mode, 6 is a function of an engine tachometer. Is a second push-button switch for changing over.

Further, reference numeral 8 denotes a changeover selection unit having built-in changeover switches 8a and 8b therein, and 9 denotes a waveform shaping circuit for converting a signal from the sensor unit 2 into a rectangular pulse signal.

Reference numeral 10 denotes an arithmetic processing of the number of revolutions of the engine based on the rectangular wave pulse signal from the waveform shaping circuit 9 to judge the input state of the first push button switch 5 and the second push button switch 6. Then, the microcomputer outputs a control signal to the changeover switches 8a and 8b in the changeover selection unit 8.

The switch 11 receives a signal from the sensor unit 2 via the switching selector 8, and on the basis of the signal, synchronizes with the engine speed in the low / medium speed range and an appropriate number in the high speed range. This is an internal processing circuit that outputs a blinking pulse signal by thinning out pulses.

Next, the operation of the engine tachometer with a timing light according to the present invention will be described. First, by operating the first push-button switch 5 and the second push-button switch 6, for example, a combined use mode of the engine rotation measurement and the timing light is set, and as a function of the engine tachometer,
When a two-cycle single cylinder is selected, the microcomputer 10
Push button switch 5 and second push button switch 6
The output signal corresponding to the situation is output to the switching selection unit 8.

The switching selector 8 turns on the switches 8a and 8b based on the output, and inputs the signal from the sensor unit 2 to the waveform shaping circuit 9 of the engine tachometer and the internal processing circuit 11 of the timing light, respectively. For this reason,
The engine tachometer and timing light can be used together.

That is, in the engine tachometer, the signal from the sensor section 2 is shaped into a rectangular pulse signal by the waveform shaping circuit section 9, and the rectangular pulse signal is input to the microcomputer 10. Therefore, the microcomputer 10 calculates the number of revolutions corresponding to a two-cycle single cylinder based on the rectangular wave pulse signal, and outputs the calculation result to the display 3, which displays the number of revolutions as the calculation result. You do it.

On the other hand, the signal from the sensor section 2 is transmitted to the internal processing circuit 11 via the switching selection section 8, and the internal processing circuit 11 is based on the signal from the sensor section 2 in the low / medium rotation range. An appropriate number of pulses are thinned out in synchronism with the engine rotation and in a high-speed rotation range, and each pulse is output to the light emitting circuit unit 4 as a blinking pulse signal.

Therefore, the internal processing circuit 11 includes the light emitting circuit 4
Flashing light emitting elements such as xenon tube
Irradiation is performed on the rotating body for measuring the ignition timing, which is the object to be irradiated, via a, and the ignition timing of the engine is measured.

By operating the first push button switch 5 and the second push button switch 6, in addition to the above-described combined use of the engine tachometer and the timing light, the operation of the engine tachometer alone, The operation can be switched to only the timing write.

Further, the engine tachometer of the present invention is configured so that the rotation speed of various engines can be measured by selecting the second push button switch 6.

[0026]

As described above, according to the present invention, the waveform shaping circuit for shaping the output pulse from the sensor unit into a square wave, and the engine speed is calculated based on the output pulse of the waveform shaping circuit. A microcomputer, a display for displaying the engine speed calculated by the microcomputer, and a pulse synchronized with the engine speed in the low / medium speed range based on the output pulse of the sensor unit, and an appropriate value in the high speed range. An internal processing circuit that obtains each output pulse that has been thinned out, based on the output pulse obtained by the internal processing circuit, causes the light emitting circuit to blink the light emitting element, and sets the engine speed measurement mode or the light emitting element The first push button switch is used to switch between a blinking mode and a combined mode in which both modes are used together, and the engine is turned according to various engines. Since the measurement function is switched by the second push button switch, and the signal from the sensor unit is distributed to the waveform shaping circuit and / or the internal processing circuit by switching the first push button switch, The function of measuring the engine speed and the function of measuring the ignition timing of the engine can be realized by an integrated housing, and there is an effect that such a function can be realized with a simple and inexpensive configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an engine tachometer with a timing light according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an engine tachometer with a timing light according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Sensor part 3 Display 4 Light emission circuit 5 1st push button switch 6 2nd push button switch 8 Switching selection part 9 Waveform shaping circuit 10 Microcomputer 11 Internal processing circuit

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02P 17/06 F02P 17/12

Claims (1)

(57) [Scope of request for utility model registration] 1. A sensor for detecting an ignition pulse of an engine by an electromagnetic induction action, a waveform shaping circuit for shaping an output pulse from the sensor into a square wave, and an engine based on an output pulse of the waveform shaping circuit. A microcomputer for calculating the number of rotations, a display for displaying the number of engine rotations calculated by the microcomputer, and a pulse synchronized with the engine rotation in the low / medium speed range based on the output pulse of the sensor unit; An internal processing circuit for obtaining an appropriate number of output pulses in the rotation range, a light emitting circuit for blinking a light emitting element based on the output pulse obtained by the internal processing circuit, and an engine speed measurement mode or the light emission mode A first push button switch for switching between an element blinking mode and a combined mode using both of these modes, Timing integrally provided with a switching selection unit that distributes a signal from the sensor unit to the waveform shaping circuit and / or the internal processing circuit by switching a second push button switch that switches an engine rotation measurement function according to an engine. Engine tachometer with light.