JPS601417Y2 - Multifunctional vehicle speed display device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a multifunctional vehicle speed display device.

2. Description of the Related Art Vehicles such as automobiles have conventionally been provided with an engine speed display device in addition to a vehicle speed display device.

However, the driver mainly needs to display the engine speed on the above-mentioned screen display device during warm-up operation immediately after starting the engine, and it is practically impossible for the driver to check the engine speed during normal driving. However, it is extremely uneconomical to independently equip a dedicated display circuit and display unit for displaying the engine speed.

The present invention is a vehicle speed display device for automobiles that uses a fluorescent display tube or liquid crystal device as a bar graph type, and by simply adding a simple configuration to the display device as a base, the vehicle speed display can be changed to the engine rotation speed. By providing a multifunctional display device that can switch between displays, the problems of the conventional devices as described above are solved.

The present invention will be explained below with reference to the embodiments shown in the accompanying drawings.

In Fig. 1, 1 is a vehicle speed sensor, 2 is a waveform shaping device, and 3
and 4 are advance counters, and 5 is a clock circuit.
The pulse sent from the vehicle speed sensor 1 is waveform-shaped (second
(See Figure C) It is counted by the W-adism counter 3.

The pulse count of the decimal counter 3 is reset by a counter reset pulse from the clock circuit 5 (see FIG. 2C), and the decimal counter 3 is reset by the clock circuit 5 for a predetermined counting time (see FIG. 2C). The vehicle speed pulses are counted with a width of The display elements 10 arranged side by side are activated only in a portion commensurate with the vehicle speed.

The 104 counter 4 counts up one digit based on the carry signal of the decimal counter 3.
Similarly, the count is divided by the clock circuit 5 every counting time T, and the count is held in the latch circuit 7 and operates the display element 10 via the decoding circuit 8 and the display drive circuit 9 as described above.

The latch times of the latch circuits 6 and 7 are controlled by the latching pulse of the clock circuit 5.

As described above, vehicle speed can be displayed in a bar graph format.

As shown in Figure 5, a vehicle speed display device using a bar graph type display element normally has 40 segments at a pitch of 2.5 km/h within the range of 0 to 1100 km/h, and 40 segments in the range of 100 to 1100 km/h. In the range of 140 b/h, the pitch is 5 b/h, and above 140 km/h, the pitch is 10 hs/h, and generally there are about 52 segments in total. For example, when the vehicle speed is 50 krn/h, the pitch is 5 b/h from 0 to 5.
The 20 segments up to 0b/h are illuminated or displayed in color, allowing the vehicle speed to be displayed in the form of a bar graph.

In the present invention, in the vehicle speed display circuit as described above, a changeover switch 11 is provided in the circuit that leads the vehicle speed pulse of the vehicle speed sensor 1 to the travel counter 3, and by switching the switch 11, the pulse of the distributor point 12 is changed to the waveform shaping device 13. A clock configured to be shaped by and guided to the advance counter 3, and in conjunction with the changeover switch 11, change the time width of the counter reset pulse, latching pulse, etc. of the clock circuit 5 to a value corresponding to the count of the engine rotation speed pulse. A changeover switch 14 is provided.

With this configuration, the driver can switch the changeover switch 11 when necessary.
When the switching operation is performed, the display element 10 of the display section displays the engine speed in a bar graph format, and when the changeover switch 11 is returned to its original state, the vehicle speed is displayed, so that the counting circuit, display drive circuit, etc. that occupy the main part of the circuit. The system can display vehicle speed and engine speed in circles for common use, and can significantly reduce costs, which can bring extremely great practical value.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram of the main parts of FIG. 1, where a is a vehicle speed pulse after waveform shaping, b is a counter reset pulse by a clock circuit,
C indicates the counter counting time, respectively. FIG. 3 is a front view showing an example of the display section. 1... Vehicle speed sensor, 3, 4... Decimal counter, 5... Clock circuit, 6, 7...
...Latch circuit, 8...Decoding circuit, 9...
... Display drive circuit, 10... Music display element, 11...
...Choice switch, 12...Distributor point, 14...Clock changeover switch.

Claims (1)

[Scope of utility model registration request] Vehicle speed pulses were counted by a counter for each predetermined time, held by a latch circuit, and a display drive circuit was activated via a decoding circuit, and a display element such as a fluorescent display tube or liquid crystal was used as a bar graph type. The display element of the display section is configured to display the vehicle speed by operating the display element, and a changeover switch is provided to switch the vehicle speed pulse to the engine speed pulse, and the pulse counting time of the counter is matched to the counting of the engine speed pulse. A multifunctional vehicle speed display device, characterized in that a clock changeover switch for switching to a clock value is provided in conjunction with the changeover switch, and the display section displays the engine rotational speed by switching the changeover switch.