JP2001311737A - Engine tachometer also serving as clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine tachometer also serving as a clock, capable of corresponding to various different engines and of switching automatically from an ordinary clock display to an engine tachometer at the same time as the main switch of a vehicle is turned on, and also bright even in the nighttime and so easy to see. SOLUTION: This engine tachometer also serving as a clock has a pulse guidance means 1 guiding a pulse of an ignition plug of the engine, a waveform shaping means 2 shaping a waveform of the pulse, a computing means 3 obtaining an output signal from it to calculate the number of revolutions of the engine, a display means 4 displaying a value corresponding to the output signal as the number of revolutions of the ending, a mode setting and switching means 6 setting a constant in computing of the computing means 3 to a value corresponding to the engine for measurement, a clock means 8 operating at all times, and a display switching means 7 switching and displaying the time to be switched and displayed arbitrarily to the same display means 4. Moreover, when a power supply input signal is obtained through an external power supply opening and closing means 9, the number of revolutions of the engine is switched and displayed in the display means 4. This engine tachometer has an illumination means 10 integrated with the display means 4 and is lit by external power supply through the external power supply opening and closing means 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital engine tachometer having a clock function using an ignition pulse of an engine mainly used for a small vehicle such as a motorcycle.

[0002]

2. Description of the Related Art Conventionally, there has been a digital tachometer having a clock function, but switching of the mode range between the clock and the tachometer is manual and the switching operation is troublesome. In addition, there is no digital engine tachometer with a clock function that can be used easily at night.Especially for in-vehicle use, it is necessary for safety during night driving, and after purchasing the vehicle, users of all types of vehicles can use it. There has been a strong demand for a device that can be easily attached and detached.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and can cope with various types of engines. It is intended to provide an engine tachometer that also switches to an engine tachometer and that is both bright and easy to see at night.

[0004]

Means for Solving the Problems A pulse inducing means for inducing a pulse of an ignition plug of an engine, a waveform shaping means for shaping a waveform of the pulse, and an output signal from the waveform shaping means are obtained to calculate an engine speed. Calculating means, a display means for displaying a value corresponding to the output signal of the calculating means as an engine speed, and a stroke number and a cylinder number of an engine to be measured by a user's operation to determine a proportional constant in the calculation of the calculating means. A mode setting / switching means for setting to a value corresponding to the above, and a clock means which operates constantly, and a display switching means for switching and displaying the time which is arbitrarily switched and displayed when the engine is stopped and when necessary, on the same display means. And when the power input signal is obtained via the external power switching means, the same display means switches the engine speed. It is to be.

[0005] It is preferable that the display means has an illumination means integrated with the display means, and is turned on by an external power supply through an external power supply connection / cutoff means.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a configuration diagram of the present invention. In FIG. 1, reference numeral 1 denotes an electromagnetic induction pulse of an ignition plug of an engine, which is input to a waveform shaping unit 2 for shaping an output signal by the pulse. Then, the signal whose waveform has been shaped is sent to the calculating means 3 in order to convert it into the engine speed. The calculation means 3 receives from the mode setting / switching means 6 a calculation condition corresponding to the number of strokes and the number of cylinders of the engine to be measured by a user operation, and displays a value corresponding to the resulting output signal as the engine speed. Is displayed by the display means 4. On the other hand, there is provided a clock means 8 which operates constantly, and displays the time when the engine is stopped. When necessary, the display switching means 7 for switching and displaying the time on the same display means 4 is replaced with the mode setting / switching means 6. It also combines with. The power input signal is supplied to the waveform shaping unit 2 via the external power switching unit 9.
In this case, the same display means 4 automatically switches and displays the engine speed. The various means subsequent to the waveform shaping means 2 are operated by the built-in battery 12, but the power is supplied from the external power supply simultaneously with the input of the external power supply, thereby reducing the consumption of the built-in battery 12.

Further, there is provided an illuminating means 11 integrated with the display means 4, and the illuminating means 11 is turned on by an external power supply via an external power supply opening / closing means 9 and a voltage conversion means 10.

FIG. 2 is a perspective view showing the appearance of FIG. 1, and FIG. 3 is a block diagram of FIG. In FIGS. 2 and 3, a pulse input line A of a copper wire serving as the pulse guiding means 1 and an external power supply input wiring F serving as a plus side wiring for taking in external power supply are provided from one side end of the engine tachometer main body B serving as a clock. The negative side earth wire E is taken out. The external power supply input wiring F is connected to an external power supply wiring H of a vehicle main switch G as an external power supply opening / closing means. A liquid crystal display section C is provided on the surface of the engine tachometer main body B, and a mode switch D1 and a set switch D2 having both mode setting / switching means 6 and display switching means 7 are arranged beside the liquid crystal display section C. . A microcomputer M wired to a board is housed inside the engine tachometer main body B. Further, this microcomputer M has a clock element K
And a CPU, a ROM and a RAM, and various signals are input and output from an input / output port J. When an external power supply is input, the microcomputer M reads this signal and the liquid crystal display C automatically switches to the engine speed. When an external power supply is input, the LCD
Switches to the clock.

[0009] Further, the liquid crystal display surface C is supplied from an external power supply via a DC / AC converter N.
A backlight L by EL is provided on the back side of the inside.

When using this, an engine type mode suitable for the engine of the mounted vehicle is set in advance, and the engine is mounted in the following procedure. 1. The watch / engine tachometer body B is fixed to a place where it is easy to see with double-sided tape or the like. 2. The pulse input lead A is attached to the high voltage cord of the ignition plug of the vehicle. 3. The external power supply input line F is connected to the external power supply wiring H of the vehicle main switch G, and the ground wire E is connected to a body ground or a ground cord. Then, as shown in FIG. 4, after use, the user simply presses the switching button in accordance with what he or she wants to measure from an ordinary timepiece. By the way, when starting the engine when the vehicle is going to run, always press the main switch,
At this time, the external power is input at the same time, and the mode is automatically switched from the clock to the mode of the engine tachometer.

FIG. 5 is an explanatory view showing a vehicle-mounted state of the present invention. As shown in FIG. 5, the timepiece / engine tachometer of the present invention is small and lightweight, so that it can be easily mounted near the speedometer around the steering wheel in various vehicles.
Moreover, the changeover switch D is easy to operate close to the vehicle main switch.

[0012]

As described above, according to the present invention, by switching on the main switch (power supply) at the time of starting the engine, the switching from the clock to the engine tachometer can be performed automatically without operating each time. it can. Also,
By incorporating an external power supply, the consumption of the internal battery can be reduced.

Further, by providing the display unit with an illuminating means, that is, a backlight, a bright and easy-to-see safe driving can be performed even at night.

[0014]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of the present invention.

FIG. 2 is a perspective view showing the appearance of the present invention.

FIG. 3 is a block diagram of the present invention.

FIG. 4 is an explanatory view showing the handling of the present invention.

FIG. 5 is an explanatory diagram showing a vehicle-mounted state of the present invention.

[Explanation of symbols]

Reference Signs List 1 pulse guiding means A pulse input line 2 waveform shaping means B engine tachometer main body 3 arithmetic means C liquid crystal display unit 4 display means D changeover switch 5 memory D1 mode switch 6 mode setting / switching means D2 set switch 7 display switching means E earth Line 8 Clock means F External power input line 9 External power switching means G Vehicle main switch 10 Voltage conversion means H External power wiring 11 Lighting means J Input / output port 12 Built-in battery K Clock element L Backlight (EL) M Microcomputer N DC / AC converter

Claims (2)

[Claims] 1. A pulse inducing means (1) for inducing a pulse of an ignition plug of an engine, a waveform shaping means (2) for shaping a waveform of the pulse, and an output signal from the waveform shaping means (2). Calculation means for calculating the engine speed (3)
A display means (4) for displaying a value corresponding to an output signal of the calculating means (3) as an engine speed; and an engine for measuring a proportional constant in the calculation of the calculating means (3) by a user operation. Along with the mode setting / switching means (6) for setting to a value corresponding to the number of strokes and the number of cylinders, a clock means (8) which operates constantly, and the time when the engine is stopped and arbitrarily switched and displayed when necessary when the same is displayed. Means (4) for switching and displaying, and when the power input signal is obtained via the external power supply opening / closing means (9), the same display means (4) displays the engine. An engine tachometer that also serves as a clock, wherein the number of revolutions is switched and displayed. 2. The lighting device according to claim 1, further comprising an illumination means integrated with the display means, and illuminated by an external power supply via an external power supply opening / closing means. Clock and engine tachometer.