JPS6131814B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bar graph display type vehicle speed display device which not only has the function of displaying the traveling speed of the vehicle but also has the function of displaying the set speed of the vehicle's constant speed traveling device installed in the vehicle. .

Conventionally, when a vehicle is equipped with a constant speed traveling device that automatically maintains the vehicle's running speed at a preset speed, it is necessary to notify the driver of the set speed, and a dedicated display device has not been provided. Ta.

However, providing a dedicated display device is not a preferable method from the viewpoint of display space or display frequency.

2. Description of the Related Art In recent years, bar graph display type vehicle speed display devices have been put into practical use, which display the running speed of an automobile as a bar graph by sequentially lighting up a plurality of display segments arranged in a band shape. (For example, see Japanese Patent Laid-Open No. 55-11237.) Since this bar graph display type vehicle speed display device has a plurality of display segments arranged in a band shape as described above, at least one display segment is used to display the traveling speed. When the display is in a different state than when it is displayed, for example, when the display is blinking, a new display function is achieved without impairing the display function of the traveling speed.

This invention focuses on the characteristics of the above-mentioned bar graph display type vehicle speed display device, and makes display segments of the bar graph display type vehicle speed display device blink in accordance with a set speed signal of a constant speed traveling device for an automobile. The object of the present invention is to display the set speed of a constant speed traveling device for an automobile using this bar graph display type vehicle speed display device.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a display section that displays the running speed of a car as a bar graph.Display section 1 has 64 display segments S ₀ , S ₁ ...... S ₁₉ ... arranged in a band shape.
...S ₆₃ . Each display segment
S ₀ ~ _{S 63} to segment electrode P ₀ ………P ₁₉ ………
_P63 are respectively derived, and the display segments _S0 to _S63 are turned on or off in accordance with the signals applied to the segment electrodes _P0 to _P63 .

FIG. 2 shows a drive circuit that drives the display unit 1. This drive circuit receives the count output of a counter 2 that counts a vehicle speed pulse signal P having a frequency proportional to the traveling speed, and receives the count output of the display section 1. A signal converter 3 that issues a bar graph display signal that sequentially lights up S ₀ to S ₆₃ receives a set speed signal a from the automobile constant speed traveling device 4, selects one of the corresponding display segments, and blinks the signal. The segment driver 6 receives the bar graph display signal or the blinking signal and turns on or off each display segment _S0 to _S63 .

The signal converter 3 includes a register 31 that temporarily stores the count output of the counter 2 in accordance with the timing signal _T1 , and decodes the output signal of this register 31 and outputs a pergraph display signal from 64 output terminals 0 to 63. It is composed of a decoder 32 that outputs.

Further, the flashing display selection section 5 receives an output signal from a register 51 that temporarily stores a set speed signal a according to the operation of the set switch 41 of the constant speed traveling device 4 for an automobile, and selects a signal corresponding to this signal. a decoder 52 which outputs an output from one of the 64 terminals 0' to 63';
3. Oscillator 54 that emits a blinking signal and AND gates A ₀ , A ₁ ......A ₁₉ that pass and block this blinking signal.
......It is composed of A ₆₃ and A ₆₄ .

That is, the blinking display selection section 5 has a register 51,
It is composed of a blinking signal generation section consisting of a decoder 52, an oscillator 54, and a plurality of AND gates _A0 , _A1 ... _A19 ... _A63 , _A64 , and a flip-flop 53 as a blinking signal control section. There is.

The segment driver 6 receives the output signal of the decoder 32, that is, the bar graph display signal.
Exclusive OR gates O ₀ , O 1 which have two inputs are the output signals of AND gates A ₀ to A ₆₃ , that is, the blinking _signals .
A display segment drive signal is generated according to each output of O ₁₉ ......O ₆₃ , and each output terminal 6 ₀ , 6 ₁ ...
. . 6 ₁₉ . . . 6 ₆₃ are connected to the segment electrodes P ₀ to P ₆₃ , respectively.

The vehicle constant speed traveling device 4 compares a signal proportional to the traveling speed with the set speed signal a by operating the set switch 41, and automatically maintains the traveling speed of the vehicle at a speed corresponding to the set speed signal a. The above-mentioned operation is started and stopped by operating the reset switch 42, and its configuration is similar to that of a known one.

Next, the operation of the embodiment configured as described above will be explained.

[] Operation of constant speed vehicle traveling device 4 when not in operation The constant speed traveling device 4 for vehicle stops its operation by operating the reset switch 42.

By operating the reset switch 42, the flip-flop 53 is reset and the Q output becomes "0". As a result, the AND gate A64 is closed, and the remaining AND gates _A0 to _A63 are also closed, and their outputs are all "0". Become. In other words, the blinking display selection section 5 does not output a blinking signal.

Now, if the speed of the car is 50km/h,
The decoder 32 of the signal converter 3 has output terminals 0 to 1.
9 is "1" and the remaining terminals 20 to 63 are "0", which outputs a bar graph display signal indicating a speed of 50 km/h.

As mentioned above, since no blinking signal is generated, one input signal of the exclusive OR gates _O0 to _O63 is "0", so the above bar graph display signal is input as is to the segment driver 6, and therefore the display section 1 is the display segment S ₀ to _{S 19}
lights up, the remaining display segments S ₂₀ to _{S 63} go out, and the bar graph displays the traveling speed of 50 km/h.

[] Function of the constant speed traveling device 4 for automobiles during operation The constant speed traveling device 4 for automobiles is operated by the set switch 4
The operation is started by operation 1.

By operating the set switch 41, the flip-flop 53 is set, the Q output becomes "1", and the AND gate A ₆₄ is opened, while the register 5
1 is a set speed signal a of the automobile constant speed traveling device 4
temporarily memorize. Suppose that the set speed signal a is 50km/
h, the decoder 52 sets the output terminal 19' to "1" and the remaining terminals 0' to 18',
20' to 63' become "0" and AND gate A
19 is selected and opened. Therefore, the blinking signal of the oscillator 54 is output to the exclusive OR gate _O19 via AND gates _A64 and _A19 , and as a result, the output of this exclusive OR gate _O19 becomes "0" in synchronization with the blinking signal. Repeat “1” alternately. Therefore, the display section 1 selects the display segment _S19 and starts blinking, indicating that the set speed is 50 km/h.

At this time, the remaining exclusive OR gates O ₀ ~ O ₁₈ , O ₂₀
One input of ~O ₆₃ is "0", and the running speed is displayed as a bar graph with the same effect as in [] above.

As explained above, according to the present invention, at least one of the plurality of display segments of the bar graph display type vehicle speed display device is selected and blinked in accordance with the set speed signal of the constant speed traveling device for an automobile. As a result, it can have a function of displaying the set speed of the constant speed traveling device for automobiles, so that the above-mentioned conventional problems can be solved.

In addition, when the constant speed traveling device for automobiles operates,
At least one of the plurality of display segments of the bar graph display type vehicle speed display device corresponds to the set speed.
Since the two display segments flash, it is also possible to indicate that the vehicle constant speed traveling device is in operation.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a display section of a bar graph display type vehicle speed display device of the present invention, and FIG. 2 is a circuit diagram showing a circuit for driving the display section shown in FIG. 1. 1...Display unit, 4...Constant speed traveling device for automobiles,
5...Blinking display selection section, 6...Segment driver.

Claims (1)

[Claims] 1. In a bar graph display type vehicle speed display device in which a plurality of display segments are arranged in a band shape and display the running speed of a vehicle as a bar graph, these display segments are arranged so that the set speed of the vehicle's constant speed running device installed in the vehicle is displayed using the display segments. A blinking display selection section is provided which selects and blinks a display segment, and a set speed signal of the constant speed vehicle traveling device is input to this blinking display selection section, and according to this signal, one of the plurality of display segments is selected. A blinking signal generating section selects at least one and outputs a blinking signal to the segment driver to make it blink, and both signals from the set switch and reset switch of the constant speed traveling device for automobiles are input, and the signal from the set switch is used to select the above segment driver. A blinking signal control section that puts the blinking signal generation section into an active state and outputs a blinking signal, and a blinking signal control section that puts the blinking signal generation section into an inactive state and stops outputting the blinking signal in response to a signal from a reset switch. Features: Bar graph display type vehicle speed display device for automobiles.