JPH02279436A - Vehicle operational state display - Google Patents

Abstract

PURPOSE:To inform a vehicle operational state correctly to a driver of a succeeding car or the like by constituting plural different displays corresponding to respective detected results so as to be selectively performed on the basis of these detected results of a travel speed detecting means and an adjustable speed detecting means. CONSTITUTION:Output of an adjustable speed detecting sensor 2, a brake operation detecting sensor 4 and a travel speed detecting sensor 6 are, respectively, inputted into a microprocessing unit 1 via voltage conversion circuits 3, 5, 7 and so on, and according to the detected result processed hereat, a display state at display bodies (16 X 16 dot matrix LED) 12a, 12b is controlled by a controller 9 via low drivers 11a, 11b and column drivers 14a, 14b. In brief, when a fact that vehicle speed is going up is detected, a character of 'acceleration' is displayed, and when a fact that it is in a state of being braked is detected, a character of 'stoppage' is displayed instead. In addition, when it is detected that speed is in effectiveness, a character of 'deceleration' is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a display device capable of displaying the operational status of a vehicle such as an automobile on the outside of the vehicle.

(Prior art) Vehicles such as automobiles generally have tail lights to notify following vehicles, etc. that they have stepped on a brake pedal, or a tail lamp to notify following vehicles or oncoming vehicles in advance when changing lanes or turning left or right. A display device such as a direction ↑ indicator light is provided. Furthermore, a display device has been proposed that is configured to display changes in the degree of depression of the accelerator pedal on the rear of the vehicle or the like to inform following vehicles or the like of the speed of the vehicle.

[Problems with conventional technology]

By the way, for example, when a car is moving from a flat road to a slope, or from a flat asphalt road to a gravel road, no matter how much you press the accelerator pedal, the speed will not increase. Something like this happens. Therefore, the gear is changed to increase the engine speed to achieve the desired speed. In this way, even if the accelerator pedal is depressed more, it does not necessarily mean that the speed of the vehicle will increase, so a model that displays changes in the degree of accelerator pedal depression to notify the speed of the vehicle, etc. The display device has a problem in that it is difficult to display a display that faithfully reflects the actual movement of the vehicle.

[Purpose of the invention]

In view of the above-mentioned conventional drawbacks, the present invention provides a vehicle operation status display device that can selectively display a display that faithfully reflects the actual movement of the vehicle and a display that indicates the stopped state depending on the situation. The purpose is to

[Key points of the invention]

According to the present invention, the object includes a traveling speed detecting means for detecting the traveling speed of a vehicle, and an acceleration/deceleration detecting means for detecting acceleration and deceleration of the vehicle, the acceleration/deceleration detecting means and the traveling speed detecting means. This can be achieved by providing a vehicle operation status display device that selectively displays a plurality of different displays corresponding to the detection results obtained in the above.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic block diagram of main parts of a vehicle operation status display device according to the present invention.

In the figure, an MPU (microprocessor sensor unit) 1 is a microcomputer unit containing a CPU, ROM, RAM, a parallel output board, a timer, a black and white oscillation circuit, etc., and a program executed by the CPU in the MPU 1 is It has been written into the ROM.

The detection output of the acceleration/deceleration detection sensor 2 is input to a voltage conversion circuit 3, and the voltage conversion circuit 3 has an acceleration detection output and a deceleration detection output.
I am inputting it to I. The detection output of the brake operation detection sensor 4 is generated by a voltage conversion circuit 5 that converts a change in the detected physical quantity into a voltage change, and the output of the voltage conversion side B5 is the same as the above-mentioned M.
Input to PtJl's human-powered boat lz. Further, the output of the running speed detection sensor 6 that detects the running speed of the vehicle is input to a voltage conversion circuit 7, and the output of the voltage conversion circuit 7 is input to an analog input terminal of an A/D conversion circuit 8. . The Bg A/D conversion circuit 8 is of a type that serially outputs the digital conversion result, and its output terminal is input to the input port +3 of the MPUI. Further, the output port P of the MPUI outputs a digital conversion result request signal requesting the A/D conversion circuit 8 to output the digital conversion result bit by bit to the input capacitor 13. .

On the other hand, in the vehicle operation status display device of the present invention, a controller 9 controls a display body for displaying a display corresponding to the detection state of the acceleration/deceleration detection sensor 2, the brake operation detection sensor 4, and the traveling speed detection sensor 6. The controller 9 includes a character generator, an address decoder,
It has two sets of address counters and two sets of oscillation circuits, and an interface circuit (PP
I). The controller 9 is EP
Although it may be assembled on a board by combining ROM, CMO3-IC, etc., a dedicated controller I that integrates the whole
C can also be used. Then, the controller 9
The output line loa of one of the character generators is connected to a display (I6XI6 dot matrix LED) 12a via a row driver 11a, and the output line Job of the other character generator of the controller 9 is connected via a row driver llb. It is connected to the display body 12b. Further, the output line 13a of one address decoder of the controller 9 is connected to a column driver 14a.
is connected to the display body 12a via an output line 13b of the other address decoder of the controller 9.
is connected to the display body 12b via a column driver 14b. In cooperation with the address counter, the oscillation circuit, etc., the display body 12
a and 12b are dynamically driven for each -column. The MPUI and the controller 9
are connected by the interface circuit (PPI), and predetermined input/output terminals of the interface circuit are connected to the M
It is connected to the PUI data bus, control bus, address bus, etc.

Although not shown in the drawings, the acceleration/deceleration detection sensor 2 has a pressure sensor such as a strain gauge disposed at one end of a cylindrical or square tube made of plastic, glass, metal, or other material. Further, a liquid such as oil or glycerin is previously sealed and stored in the container under pressure. Then, the end face on which the pressure sensor is provided is located at the front or rear in the direction of travel of a vehicle such as an automobile, and is mounted at an appropriate location within the automobile, for example. Therefore, when the acceleration/deceleration detection sensor 2 is fixed in the vehicle so that the pressure sensor is located on the front side in the traveling direction when the vehicle is running, the pressure decreases during acceleration and increases during deceleration.

Conversely, when the acceleration/deceleration detection sensor 2 is fixed inside the vehicle so that the pressure sensor is located on the rear side in the traveling direction,
The pressure increases during acceleration, and the pressure decreases during deceleration.

In the voltage conversion circuit 3, there is a bridge circuit connected to the pressure sensor, and a circuit whose on/off is controlled by the output of the bridge circuit.
There are comparators for acceleration detection, comparators for deceleration detection, etc., which are connected to each other, and the outputs of these comparators are input to the input ports io and It. Further, the brake operation detection sensor 4 is constituted by a switch that opens and closes in accordance with the operation of a brake pedal, and a comparator or the like is provided in the voltage conversion circuit 5 to which the switch is connected.

The output of the comparator is input to the input port (2).

The traveling speed detection sensor 8 is a small generator constructed by combining known mechanical mechanisms so that it can rotate with the rotation of the wheels. This is converted into an analog voltage that changes as the rotational speed changes, and this is input to the A/D conversion circuit 8. Note that the crystal oscillator 15 is for generating a clock signal for the MPUI.

FIG. 2 is a flowchart of a control program related to the vehicle operation status display device of the present invention, which is written in the ROM.

The process will be explained below based on the flowchart.

The program in this flowchart is executed at regular intervals, for example, by timer interrupt processing.

In step 1 (STI), the input port 1o
Alternatively, the state of the input port II is checked to determine whether acceleration is occurring. If it is accelerating, step 2
Proceed to (Sr1), read out the measurement results of the A/1 conversion circuit 8, wait a while, read out the measurement results of the A/D conversion circuit 8 again, and compare them to find out that the speed of the car, etc. is increasing. Decide whether or not. As a result, if the speed is increasing, the process proceeds to step 3 (Sr1), and the characters "acceleration" are displayed on the display bodies 12a and 12b.
) and then finishes interrupt processing.

In step 2 (Sr1), if the speed is not increasing, the process proceeds to step 4 (Sr1), where the state of the input capo [.I2 is checked to determine whether or not the brake is applied. If the brake is applied, the process proceeds to step 5 (Sr5), where the display units 12a and 12b are controlled to display the characters "'stop pa", and thereafter, the interrupt process ends. 4 (ST4), if the brake is not applied, the interrupt process is ended without doing anything.

In step 1 (STI), if the vehicle is not in an acceleration state, the process proceeds to step 6 (Sr1), where the state of the input port L or the input port 1 is checked to determine whether or not the vehicle is decelerating. When it is in the deceleration state, the process advances to step 7 (Sr7) and the step 2 (Sr
The same process as in 1) is performed to determine whether the speed is decreasing. If the speed is decreasing, step 8 (S
Proceeding to step r8), the display units 12a and 12b are controlled to display the words ``Deceleration''. Then, interrupt processing ends. In step 7 (Sr7), if the speed is not decreasing, step 4 (Sr1)
The process proceeds to , performs the processing described above, and ends the interrupt processing.

In the step 6 (Sr1), if the deceleration state is not reached, the process proceeds to step 9 (Sr1) and the S
In T2, the same process as in ST7 is performed to determine whether the speed is approximately constant. When the robot speed is constant, proceed to step 10 (solo), and the display bodies 12a, 12b
After controlling the display to display the characters "'constant speed", the interrupt processing ends.

Further, in step 9 (ST9), if the speed is not constant, the process proceeds to step 11 (ST11), where it is checked whether the speed is zero or not, and if the speed is zero, the process proceeds to step 5 (ST5). Proceed to the display body 12
Control so that the characters “stop”° are displayed on a and 12b,
After that, interrupt processing ends. And the step 1
1 (STII), if it is determined that the speed is not zero, the interrupt processing ends without doing anything.

As an acceleration/deceleration detection sensor, a pressure sensor such as a strain gauge is disposed at both ends of a cylinder or rectangular cylinder made of plastic, glass, metal, or other material, and a pressure sensor such as a strain gauge is installed in the container. It is also possible to use a container that is sealed and housed in a pressurized state in advance, and the detection output based on each strain gauge is manually input to the manual port of the MPUI, thereby making it possible to respond to changes in conditions on slopes etc. Fine-grained control may also be provided.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the display that faithfully reflects the actual movement of the vehicle and the display that indicates the stopped state can be selectively displayed in various ways depending on the situation. The operational status of the vehicle can be accurately notified to following vehicles, etc., and the following vehicles can see the display and take appropriate actions, and traffic order can be maintained smoothly, greatly contributing to traffic safety.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram of main parts of a vehicle operation status display device according to the present invention, and FIG. 2 is a flowchart of a control program related to the vehicle operation status display device according to the present invention. 1...MPU. 2... Acceleration/deceleration detection sensor 2. 3... Voltage conversion circuit, 4... Brake operation detection sensor, 5... Voltage conversion circuit, 6... Traveling speed detection sensor, 7... Voltage conversion Circuit, 8...A/D conversion circuit, 9...Controller, 12a...Display body, 12b...Display body.

Claims (1)

[Claims] It has a traveling speed detecting means for detecting the traveling speed of the vehicle, and an acceleration/deceleration detecting means for detecting the acceleration and deceleration of the vehicle. A vehicle operation status display device that selectively displays multiple different displays corresponding to