JPS61155814A - Bar graph type tachometer for vehicle - Google Patents

Abstract

PURPOSE:To realize the best driving by displaying both the rotating speed and suction pressure of an engine at the same position simultaneously with light emission colors of illuminating segments. CONSTITUTION:Diodes Da (Da1-Dan) of the segments S (S1-Sn) are controlled by a transistor (TR) Ta with the output signal of a monostable multivibrator (MM)6 to turn off when the suction pressure of the engine is high and the output signal of the MM6 is at 'H' and illuminate when the suction pressure of the engine is low and the output signal of the MM6 is at 'L'. On the other hand, diodes Db (Db1-Dbn) of the segments S are controlled by a TRTb with the output signal of an inverting circuit 7 to turn off when the suction pressure of the engine is low and illuminate when high. Thus, the diodes Da and Db turn on and off according to the suction pressure of the engine so that one turns off when the other turns on; and the diodes Da and Db emit light of different colors, so the light emission color of the all segments S which illuminate varies and the best driving is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bar graph type tachometer for a vehicle that changes the color of light emitted from a display section depending on the intake pressure of an engine.

[Technology Tip 11 The engine speed is important information in knowing the condition of the engine. For this reason, vehicles are provided with a tachometer for displaying the engine speed. Recently, a bar graph type tachometer as shown in Fig. 4 has been proposed, and the tachometer responds to the engine speed by emitting light from a light emitting diode installed in a display unit element (hereinafter referred to as a segment) S. The number of segments S is made to emit light (see Utility Model Application No. 59-32920). That is, the segments S are arranged in a shape similar to the output characteristic curve of the engine, for example, from 100 to 500 r
The number of engine revolutions is displayed for each pm by the number of segments S emitting light.

[Prior Art] By the way, a conventional percrough type tachometer has a circuit configuration as shown in FIG.

1 is a display section in which n segments are arranged in a shape similar to the output characteristic curve of the engine, and each segment S
Each segment S is made to emit light by n light emitting diodes from dd provided within the segment S to display the engine speed.

Reference numeral 2 denotes a light emission number control means that causes a number of segments S to emit light according to the engine rotation speed. For example, the engine rotation speed is converted into an electrical signal and extracted, and this output signal is converted using a monostable multi-bump plater. The waveform is shaped to create a current signal proportional to the intermittent signal, and the number of light emitting diodes to emit light is determined based on that signal. Reference numerals t1 to t1 are transistors serving as switches that turn on/off the light emitting diodes 1iIITa based on the output signal from the light emission number control means. Also, r+ ~ “N
is a current limiting resistor that limits the current flowing into the light emitting diode.

Such a bar graph type tachometer allows the driver to know the engine speed and drive the vehicle appropriately.

[Problems to be Solved by the Invention] The conventional tachometer described above is designed to determine the state of the engine based on the engine speed. However, it is not always possible to grasp the exact state of the engine just by displaying the engine speed. In other words, not only the engine rotation speed but also the engine intake pressure is important information for knowing the engine condition, and in order to operate more appropriately in relation to the engine, it is necessary to know the engine intake pressure as well. There is.

By the way, the engine intake pressure can be displayed as a separate instrument from the tachometer, but if the engine speed and intake pressure were displayed separately, it would be difficult to see, and the recognition of the engine status would be delayed. Put it away.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bar graph type tachometer that simultaneously displays engine speed and intake pressure. The technical means for this purpose is to measure the number of revolutions of the engine, and to measure the number of rotations of the engine, and to measure the number of revolutions of the engine, and to measure the number of revolutions of the engine, based on the measurement results. In a bar graph type tachometer comprising a light emitting number control means for controlling the number of display unit elements to be emitted, a plurality of diodes emitting light of different colors are provided in each of the display unit elements, and the intake pressure of the engine is measured. A bar graph type tacho for a vehicle, characterized in that it is provided with a light emission color control means for changing the light emission color of the display unit element by controlling the light emission of each diode in each display unit element based on the measurement result. done by meter.

[Example] Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a bar graph type tachometer for a vehicle according to an embodiment of the present invention.

In FIG. 1, 1 represents n segments 81 to S.
This is a display section placed on the instrument panel so that the shape resembles the engine's output characteristic curve. Within each of these segments, for example, two light emitting diodes Qa and Qb of different luminescent colors are provided, and the light from one of these light emitting diodes is visible. The diodes [)a and Db configured in this manner are arranged in each segment SI~&. That is, DtL+, D^λ...DM in each segment all have the same luminescent color, and DI;++, Dbλ...
- D- is the same luminescent color as DtL+ to DAA, and the luminescence is controlled by switching the luminescent color control means, which will be described later.

Reference numeral 2 denotes a light emission number control means that determines and controls the number of segments S to emit light according to the engine speed. For example, when the engine rotation speed is 2000 rpm/sin, the 20th segment S
This makes xo emit light. This control method converts the engine rotational speed into an electrical signal and extracts it, similar to the conventional light emission number t+1JIl] means, and uses a monostable multivibrator to shape the waveform of this output signal.
A current signal proportional to the intermittent signal is created, and the number of segments to be emitted is controlled based on that signal. 3
is a light emission color control means that changes the light emission color of the segment S according to the engine intake pressure by switching the light emission of the diodes Da and Qb in the segment S according to the engine intake pressure. For example, as shown in FIG. circuit 7
It consists of The pressure sensor 4 is a second pressure sensor.
As shown in the figure, a voltage value proportional to the engine intake pressure is output. The V-F conversion circuit 5 converts the output voltage of the pressure sensor into a frequency signal proportional to the output voltage, and outputs a pulse signal corresponding to the high and low output voltage of the pressure sensor 4, as shown in FIG. Output. The monostable multivibrator 6 converts the output signal of the V-F conversion circuit 5 into a pulse signal having a constant pulse width as shown in FIG.

T1-- is a transistor that controls light emission of segments 81 to Sn-. In addition, Ra+~RcL1% and Rb
+ ~ R17 ~ are the diodes D (x, + ~ D1
This is a current limiting resistor that limits the current flowing to L~, D1~Db~. Also, Ta is a diode D^ of the same color.
It is a transistor that controls the light emission of diodes 1 to D^, and the transistor controls the light emission of diodes Db+ to Dbrb of the same color.
J 1111 transistor.

The operation of the bar graph type tachometer configured in this way will be explained.

It is now assumed that the tachometer is emitting light up to the second segment SA among segments 81 to SrL, depending on the engine speed. In this case, the luminescent color of the segment is controlled as follows.

That is, the diode D^L of segment Sji/ is
Controlled by the output signal of the monostable multivibrator 6 and the transistor Ta, the light goes out when the engine intake pressure is high and the output signal of the monostable multivibrator 6 is @igh, and when the engine intake pressure is low and the output signal of the vibrator 6 is LOW. Lights up if . On the other hand, the diode Dbi of the segment D is controlled by the output signal of the inverting circuit 7 and the transistor Tb, and is turned off when the engine intake pressure is low and turned on when the engine intake pressure is high, contrary to the diode Dμ.

In this way, when one of the light emitting diodes D^i and Dbj turns on depending on the engine's intake pressure, the other one turns off.Since Dμ and D and i emit light in different colors, the entire segment S that is lit The color of the emitted light will change.

In the above embodiment, the diode set of each segment was explained as being composed of two diodes with different luminescent colors, but the number of diodes is not limited to two, and may be three or more. More than one may be provided. In addition, the diode set was explained as being the same from the first segment S to the last n-th segment S, but in order to make it easier to see the engine speed,
00rp/sin, 2000rpm/min
.

For example, 1000 rpm /Win
The emitted light color of the diode of the corresponding segment S may be changed every rotation/minute.

[Effects of the Invention] As explained above, according to the bar graph type tachometer for a vehicle of the present invention, both the engine rotation speed and the engine intake pressure can be displayed at the same time at the same location by the luminous color of the lit segment. This allows you to instantly read the engine status. As a result, it becomes possible to perform the best operation according to the engine condition, and it is possible to improve fuel efficiency.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing a bar graph type tachometer for vehicles according to the present invention, Fig. 2 is a graph showing the relationship between the intake pressure of the engine and the output voltage output by the pressure sensor, and Fig. 3 is the output of the pressure sensor. A graph showing the pulse signals output by the V-F conversion circuit, monostable multivibrator, and inverting circuit depending on the voltage. Figure 4 is an external view of a bar graph type tachometer for a vehicle. Figure 5 is a conventional one. FIG. 2 is a circuit diagram showing a bar graph type tachometer for a vehicle. 1...Display section 2...Emission number control means 3...Emission color control means 4...Pressure sensor 5...V-F conversion circuit 6...Monostable multivibrator 7...Inversion Circuit S...Segment D~D...Diode group

Claims (1)

[Claims] A display unit consisting of a plurality of display unit elements and a light emitting diode provided in the display unit elements, and the number of revolutions of an engine are measured, and the number of display unit elements to be emitted is controlled based on the measurement results. In a bar graph type tachometer comprising a light emitting number control means, a plurality of diodes emitting light of different colors are provided in each of the display unit elements, and the intake pressure of the engine is measured, and each of the display unit elements is controlled based on the measurement result. A bar graph type tachometer for a vehicle, characterized in that a bar graph type tachometer for a vehicle is provided with a light emission color control means for changing the light emission color of a display unit element by controlling light emission of each diode in the vehicle.