JPH05248894A - Displaying device for fuel consumption - Google Patents

Abstract

PURPOSE:To obtain the title device capable of displaying the transition of fuel consumption as a graph by plotting the same at every definite time or definite running distance. CONSTITUTION:A first storage means 101 stores the fuel data of a vehicle at every preset running distance and a second storage means 10b2 stores the fuel data of the vehicle at every preset time. A display control means 10c displays the transition of fuel consumption wherein a horizontal axis is set to a distance or time on a multi-dot matrix display device 12 as a graph on the basis of the fuel data stored in the first storage means l01 or the second storage means 102 corresponding to the selection of a manually operated display mode changeover means 14c. When the transition of fuel consumption wherein a horizontal axis is set to a distance or a time is displayed on the multi-dot matrix display device 12, trip meter display 12a or clock display 12b is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel consumption display device, and more particularly to a fuel consumption display device mounted on a vehicle for displaying the state of fuel consumption consumed while the vehicle is traveling.

[0002]

2. Description of the Related Art Conventionally, as a fuel consumption display device of this type, there has been one as shown in FIGS. Figure 9
In the above example, the traveling signal and the fuel signal indicating the remaining fuel amount, which are respectively detected by the traveling sensor and the fuel sender (not shown), are input to the microcomputer (CPU) 1. The CPU 1 performs calculation based on these signals and sends the result to the driver circuit 2 to display it on the display unit 3. The display 3 is composed of two-digit display elements each consisting of 7-segment display elements. In the example of the figure, 17 (km / L) indicating that the traveling distance per liter is 17 km is displayed. There is.

In the example of FIG. 10, similarly, a running signal and a fuel signal are input to the CPU 4, and the calculation result by the CPU 4 is displayed via the driver circuit 5 in 11-digit display each consisting of a display element of 5 × 7 dot matrix. It is displayed on the display 6 composed of elements, and in the example of the figure, TOTAL
10 km / L is displayed.

[0004]

However, in the conventional fuel consumption display device constructed as described above, only the instantaneous fuel consumption or the fuel consumption as the total amount is displayed. It is not possible to know the change, for example, the transition of the decrease in fuel due to the consumption of fuel.

Therefore, in view of the above-mentioned point, the present invention has an object to provide a fuel consumption display device capable of plotting the transition of fuel consumption at a constant time or at a constant traveling distance and displaying the graph as a graph.

[0006]

In order to achieve the above object, a fuel consumption display device according to the present invention has a fuel consumption indicator for a vehicle every time a vehicle travels a preset distance as shown in the basic configuration diagram of FIG. First storage means 10b for storing data
₁ , a second storage means 10b ₂ for storing fuel data of the vehicle at preset time intervals, a multi-dot matrix display 12, the first storage means 10b ₁ or the second storage means 10b ₂ Display control means 10c for displaying a graph on the multi-dot matrix display 12 of the transition of fuel consumption with the horizontal axis representing distance or time based on the fuel data stored in.

To achieve the above object, the fuel consumption display device according to the present invention also has a manual operation for selecting the display mode of the multi-dot matrix display 12, as shown in the basic configuration diagram of FIG. Display mode switching means 14c, and the display control means 10c stores the fuel data stored in the first storage means 10b ₁ or the second storage means 10b ₂ according to the selection by the display mode switching means 14c. Thus, the transition of fuel consumption with the horizontal axis representing distance or time is graphically displayed on the multi-dot matrix display 12.

The display control means 10c uses the fuel data stored in the _first storage means 10b ₁ to
When the transition of fuel consumption with the horizontal axis as the distance is graphically displayed on the multi-dot matrix display 12, the multi-dot matrix display 12 is also made to display the trip meter display 12a at the same time.

The display control means 10c uses the fuel data stored in the _second storage means 10b ₂ to
When displaying the graph of the transition of the fuel consumption with the horizontal axis as time on the multi-dot matrix display 12, the multi-dot matrix display 12 is also made to display the clock 12b at the same time.

[0010]

With the above structure, the first storage means 10b ₁ stores the fuel data of the vehicle every time the vehicle travels the preset distance, and the second storage means 10b ₂ stores the fuel of the vehicle at the preset time. It stores data. And
The display control means 10c is the first storage means 10b ₁ or the second storage means 10b ₁ .
The fuel data stored in the storage means 10b ₂ is used to display a graph of the transition of fuel consumption on the multi-dot matrix display 12 with the horizontal axis representing distance or time.

Therefore, it is possible to know the state of the transition of the fuel consumption for each traveling distance of the fuel consumption or for each elapse of a unit time from the multi-dot matrix display.

Further, in response to the selection by the manually operated display mode switching means 14c, the display control means 10c uses the fuel data stored in the first storage means 10b ₁ or the second storage means 10b ₂ to display the horizontal axis. The multi-dot matrix display 12 is graphically displayed with the transition of fuel consumption as distance or time. Therefore, by operating the display mode switching means 14c as necessary, it is possible to know the transition of fuel consumption for each traveling distance of fuel consumption or for each elapse of a unit time from the multi-dot matrix display.

Further, when the transition of fuel consumption with the horizontal axis as a distance is graphically displayed on the multi-dot matrix display 12, the trip meter display 12a shows the transition of fuel consumption with time on the horizontal axis as a multi-dot matrix display. Since the clock display 12b is displayed when the graph is displayed on the device 12, it is possible to know what the current graph display is from the trip meter display 12a and the clock display 12b.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing a circuit configuration of an embodiment of the fuel consumption display device according to the present invention. In FIG.
Reference numeral 0 denotes a microcomputer (CPU) that operates according to a predetermined control program, and has therein a ROM 10a that stores the control program and a RAM 10b that stores various data in a writable and readable manner. A traveling signal generated as the vehicle travels from the vehicle and a fuel signal indicating the remaining amount of fuel from a fuel sender provided in the fuel tank are input, and these signals are arithmetically processed and passed through the driver circuit 11. 3 or 4 on the multi-dot matrix liquid crystal display 12.
The predetermined display as shown in FIG.

The display 12 may be composed of a CRT. Reference numeral 13 is a power supply circuit that stabilizes the DC voltage from the battery and supplies operating power to the CPU 10 and the driver circuit 11.

FIG. 3 shows the state of fuel consumption per unit mileage by taking the running distance (km) on the horizontal axis, and FIG. 4 shows the fuel consumption per unit time by taking time on the horizontal axis. Is displayed according to the change in the remaining fuel amount, and the vertical axis is 1 to 2 liters per dot, depending on the tank capacity. The CPU 1 includes a distance setting switch 14a for setting the unit traveling distance and a time setting switch 14b for setting the unit time.
Connected to 0. The CPU 10 is also shown in FIG.
The display mode changeover switch 14c for selecting any one of the displays of No. 1 and the reset switch 14d for turning off the display of the display unit 12 and initializing it are also connected. In addition,
In FIGS. 3 and 4, the display is performed in the full scale of EF, but it is also possible to display in the enlarged scale such as 0-1 / 4.

The CPU 10 monitors the traveling distance by the traveling signal, reads the fuel signal every time the traveling distance reaches the set distance, and stores the remaining fuel amount at that time in the RAM 1
0b is sequentially stored in a predetermined area 10b ₁ (FIG. 5), and the time is monitored by a built-in clock. Whenever the time reaches the set time, a fuel signal is read and the remaining fuel amount at that time is stored in the RAM 10b. Other predetermined area 10b
Sequentially store in ₂ (Fig. 5). Incidentally, it is stored respectively in the distance setting switch 14a and a time setting switch 14b and the area 10b ₃ in RAM10b the set distance and the set time set respectively by 10b ₄ (FIG. 5).

One of the data stored in the RAM 10b as described above is read out in accordance with the display mode set by the display mode changeover switch 14c.
Alternatively, it is used to perform the display of FIG. In the display of FIG. 3, a trip meter display 12a indicating the traveling distance by using a part of the display area of the display unit 12 is displayed, and in the display of FIG. 4, the clock display 12b is displayed. It has become.

Details of the operation of the apparatus outlined above are described in C
The work performed by the PU 10 according to a predetermined control program will be described below with reference to the flowcharts of FIGS. 6 to 8.

The main flow chart of FIG. 6 is the CPU 10.
When the power is turned on, the operation is started, and in the first step S1, it is determined whether or not the distance is set by the traveling distance setting switch 14a, and the determination is YES.
If so, the process proceeds to step S2, the set distance data is stored in the predetermined area 10b ₃ in the RAM 10b, and then the process proceeds to step S3. When the determination in step S1 is NO, step S2 is skipped and the process proceeds to step S3.

In step S3, it is judged whether or not the time is set by the time setting switch 14b. If the judgment is YES, the process proceeds to step S4, and the set time data is stored in the predetermined area 10 in the RAM 10b.
after stored in b ₄ proceeds to step S5. Step S3
When the determination is NO, step S4 is skipped and the process proceeds to step S5. In step 5, output processing to a liquid crystal display (LCD) 12 which will be described later with reference to FIG. 8 is performed, and then the process returns to step S1.

During the execution of the main flow chart as described above, the data input processing as shown in the flow chart of FIG. 7 is executed by the timer interruption every 100 milliseconds. That is, in this data input process, the fuel data is input in the first step S11, the traveling distance data measured by the traveling signal is input in the next step S12, and then the process proceeds to step S13 where the set time is reached. If YES in step S14, the fuel data input in step S11 is stored in the predetermined area 10b in the RAM 10b.
_After setting to ₁ , the process proceeds to step S15. Step S
When the determination in 13 is NO, step S14 is skipped and the process proceeds to step S15.

In step S15, step S1
It is determined whether or not the set distance has been reached based on the distance data input in 2, and if the determination is YES, the process proceeds to step S16, and the fuel data input in step S11 is set in another predetermined area 10b ₂ in the RAM 10b. After that, a series of work is finished, and when the determination in step S15 is NO, step S16 is skipped and the work is immediately finished.

In the LCD output subroutine of FIG. 8, in the first step S5a, it is determined whether the display mode changeover switch 14c is distance or time. If it is time, the process proceeds to step S5b and the above step S5.
If the fuel data in the predetermined area 10b _{2 of the} RAM 10b sequentially set in 14 is a distance, the process proceeds to step S5c, and the fuel data in the predetermined area 10b _{1 of the} RAM 10b sequentially set in step S16 is output. Exit the subroutine.

By executing the work of the flowchart described above, the CPU 10 causes the display mode changeover switch 14c.
According to the selection by the first area 10b of the RAM 10b.
_The fuel data stored in the _first or second area 10b ₂ serves as display control means 10c for displaying a graph of the transition of fuel consumption with the horizontal axis as distance or time on the multi-dot matrix liquid crystal display 12.

In the LCD output subroutine,
The liquid crystal display 1 is operated by the display mode changeover switch 14c.
Trip meter display 12a or clock display 12 on part of 2
Since step b is performed, the user can easily know which fuel consumption display is currently being performed for a certain traveling distance or for each elapse of a certain time by looking at these displays.

As described above, in this embodiment, the distance setting switch 14a or the time setting switch 14 is set.
The fuel signal from the fuel sender is read for each mileage or elapsed time set in either b, and one dot corresponding to the fuel signal value is lit on the display 12 to draw a graph. When the horizontal axis of the display 12 is full, it is possible to scroll by one column at a set distance or time. Further, the graph is initialized and the display is erased by operating the reset switch 14d.

As described above, the fuel data used for the display of the display unit 12 is collected in an IC memory card or the like and held until a later date, and compared with the fuel consumption pattern at the time of the later date operation, thereby the economic operation It can also be used to learn how.

[0029]

As described above, according to the present invention, it is possible to know the state of fuel consumption for each mileage or each unit time elapses from a multi-dot matrix graph display. An effective monitoring means can be provided and the timing of how much distance or time to refuel can be predicted.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a fuel consumption display device according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a fuel consumption display device according to the present invention.

FIG. 3 is a diagram showing a display example performed on the display of FIG.

FIG. 4 is a diagram showing another display example performed on the display of FIG.

5 is a diagram showing an area in a RAM in FIG.

FIG. 6 is a flowchart showing a main routine of work performed by a CPU in FIG.

FIG. 7 is a flowchart showing an interrupt procedure performed during execution of the flowchart of FIG.

8 is a flowchart showing details of one step in FIG.

FIG. 9 is a diagram showing an example of a conventional fuel consumption display device.

FIG. 10 is a diagram showing another example of a conventional fuel consumption display device.

[Explanation of symbols]

10b ₁ First storage means (RAM) 10b ₂ Second storage means (RAM) 10c Display control means (CPU) 12 Multi-dot matrix display (multi-dot matrix liquid crystal display) 12a Trip meter display 12b Clock display 14c Display Mode switching means (display mode switching switch)

Claims (4)

[Claims] 1. A first storage means for storing fuel data of a vehicle for each travel of a preset distance, and a second storage means for storing fuel data of a vehicle for each preset time, A display in which the transition of fuel consumption with the horizontal axis as distance or time is displayed as a graph on the multi-dot matrix display by the dot matrix display and the fuel data stored in the first storage means or the second storage means. A fuel consumption display device comprising: a control means. 2. A display mode switching means that is manually operated to select a display mode of the multi-dot matrix display, wherein the display control means responds to the selection by the display mode switching means. 2. The multi-dot matrix display is graphically displayed by the fuel data stored in the storage means or the second storage means, in which the transition of fuel consumption with the horizontal axis as distance or time is displayed graphically. Fuel consumption indicator. 3. The display control means, when the transition of fuel consumption with the horizontal axis as a distance is graphically displayed on the multi-dot matrix display by the fuel data stored in the first storage means, The fuel consumption display device according to claim 1 or 2, wherein the multi-dot matrix display is also made to display a trip meter at the same time. 4. The display control means, when displaying the transition of fuel consumption with the horizontal axis as time on the multi-dot matrix display as a graph based on the fuel data stored in the second storage means, 2. The multi-dot matrix display device is also made to display a clock at the same time.
Or the fuel consumption display device according to item 2.