JPS5940208A - Fuel consumption display device for vehicle - Google Patents

Abstract

PURPOSE:To facilitate the judgment of a running speed at which fuel consumption becomes economical, by operating the outputs of a speed sensor and a fuel sensor, and displaying the relationship between the running speed and the fuel consumption. CONSTITUTION:When a switch 10 is operated, a microcomputer 70 starts the collection of display data. The speed signal and the fuel signal from a speed sensor 30 and a fuel sensor 40 are inputted to the microcomputer 70 through waveform shaping circuits 50 and 60 as pulse signals. The microcomputer 70 counts and operates these pulses, and the relationship between the running speed and the fuel consumption is displayed on a CRT display 90 through a controller 80. Therefore, the running speed, at which the fuel consumption becomes economical, can be readily judged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle display device, and more particularly to a vehicle fuel consumption display device suitable for displaying a fuel consumption rate (hereinafter referred to as fuel efficiency) of a vehicle.

Various types of fuel efficiency display devices for vehicles have been proposed in the past, but these display devices cannot display the fuel efficiency of the vehicle in relation to its running speed. There is a problem in that it is difficult to judge whether fuel efficiency can be maintained economically if the vehicle is run at a certain speed.

The present invention has been made in response to the above-mentioned problems, and an object of the present invention is to provide a fuel efficiency display device for a vehicle that displays the fuel efficiency of the vehicle in relation to its running speed. .

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
The figure shows an example of a fuel efficiency display device for a vehicle according to the present invention, and in the figure, reference numerals 10 and 20 indicate self-returning normally open type first and second operation switches, and reference numerals 60 and 40 respectively indicate self-resetting normally open type first and second operating switches. indicate a speed sensor and a fuel sensor, respectively. The first operation switch 10 is operated to generate a first operation signal when it is necessary to start collecting display data in the microcomputer 70 (described later), and the second operation switch 20 is operated to generate a first operation signal.
It is operated to generate a second operation signal when it is necessary to save the collected display data within 0.0.

The speed sensor 60 detects the speed at which the vehicle is traveling and generates a series of speed signals having a frequency proportional to this speed, and the fuel sensor 40 detects the speed at which the vehicle is running, and the fuel sensor 40 detects the speed at which the vehicle is running and generates a series of speed signals having a frequency proportional to this speed. The amount of fuel is detected at predetermined time intervals and generated as a fuel signal. Waveform shaper 5
0 sequentially shapes each speed signal from the speed sensor 60 into one rectangular wave pulse, and the waveform shaper 60 shapes each fuel signal from the fuel sensor 40 into a second rectangular wave pulse.

The microcomputer 70 operates by receiving power from a DC power supply in response to the operation of the ignition switch of the vehicle, and its main components include a central processing unit (hereinafter referred to as CPU) and an input/output device (hereinafter referred to as CPU). ,%
(hereinafter referred to as ROM), read-only memory (hereinafter referred to as ROM), random-access memory (hereinafter referred to as RAM)
) and a clock circuit. % stores the operation signals from both operation switches 10 and 20 and the memory contents immediately before opening both John switches as they are even after opening the ignition switch. The ROM stores in advance a display control program necessary for the CPU to execute according to the flowcharts shown in FIGS.

The CPU has a built-in first and second timer counter, and
The first and second timer counters repeatedly measure the first and second predetermined time values (in this example, 1 second and 2 minutes, respectively), and the first and second timer counters repeatedly measure the first and second predetermined time values (in this example, 1 second and 2 minutes, respectively), and each time the first and second predetermined time values are completed. A second timing completion signal is generated. The CPU still has a built-in first and second pulse counter, and these first and second pulse counters are connected to the waveform shaper 5 in cooperation with the RAM.
The numbers of the first and second rectangular wave pulses occurring sequentially from 0 and 60 are counted, respectively. The CPU, in cooperation with the crystal oscillator, repeatedly executes the above-mentioned display control program in response to a series of clock signals generated from the clock circuit, and during the repeated execution, the CPU performs operations as described in the following operation description. A cathode ray tube display 90 (hereinafter referred to as CR7 display 90) performs various arithmetic processing.
A coordinate plane display command signal and a series of first and second coordinate display command signals necessary for controlling the Nodametsu controller 80 are generated.

In this case, the coordinate plane display command signal is a coordinate plane display pattern (previously stored in the ROM stored in ). Further, each of the first coordinate display command signals corresponds to the fuel consumption curve L1 (see FIG. 2) representing the fuel consumption in relation to the traveling speed of the vehicle, which is actually collected during the arithmetic processing of the microcomputer 70. Each of the second coordinate display command signals corresponds to each coordinate (in this embodiment, the coordinates are for each traveling speed 'l kmlh), and each of the second coordinate display command signals corresponds to the traveling speed of the vehicle stored in the microcomputer 70. This corresponds to each coordinate (in this embodiment, the coordinate is a coordinate for each traveling speed of 2 b/h) on the fuel consumption curve L2 (see FIG. 2) representing the fuel consumption in the relationship.

The controller 80 is a microcomputer 70 and CR7
Q is connected between the display device 90 and stores the contents of this signal in response to a coordinate plane display command signal from the CPU, and also stores the contents of the first (or first and second) signals repeatedly generated from the CPU. In response to the coordinate display command signal, the content of each of these signals is made to match each part of the coordinate plane display pattern corresponding to each content in sequence and stored as display data.

Further, the controller 80 generates a synchronizing signal at the same time as its operation starts, and also generates the stored display data as a video signal in relation to this synchronizing signal. The CR7 display 90 is placed at a suitable location in the cabin of the vehicle, and displays a fuel consumption curve L□ (also 1') on the coordinate plane Sj- on its display surface in response to the synchronization signal and video signal from the controller 80.
i L 1 and L2 ) are displayed as illustrated in FIG.

In this embodiment configured as described above, when the ignition switch is operated to place the vehicle at a running speed of 4 kg and the microcomputer 70 is activated, the CPU executes the display control program according to the flowchart=1 in FIG. At step 100, execution starts, and at step 110, the contents of the microcomputer 70 are initialized.

Further, in response to the operation of the microcomputer 70, the first pulse counter of the CPU starts counting the number of first rectangular wave pulses generated from the waveform shaper 50 in cooperation with the speed sensor 60, and At the same time, the second CPU
The pulse counter starts counting the number of second rectangular wave pulses generated from the waveform shaper 60 in cooperation with the fuel sensor 40 and the RAM. Further, the first and second timer counters of the CPU start counting first and second predetermined time values, respectively, in response to the operation of the microcomputer 7o.

If the first operation switch 1o is operated at this stage, C
In step 121 of the data clear routine 120 (see FIG. 6 and FIG. 4(A)), the PU determines JYESj based on the first operation signal generated from the first operation switch 1o, and in the missing step 122, In relation to all indexes (3) in the RAM, each fuel consumption data A (1) and each data number N (I) stored in the RAM are all cleared to zero.

Therefore, the determination in step 131 of the data storage routine 160 (see FIGS. 3 and 4 (B)) is
After the operation switch 20 is not operated, the display control program executes the data collection routine 140 (
3 and 4 (0)), the CPU, in step 141, calculates the count value of the first pulse counter,
That is, at the same time as reading the first rectangular wave pulse number to,
Reset the pulse counter and start counting again.
and the number y of first rectangular wave pulses read out. is added to the number l of preceding first rectangular wave pulses (which has already been stored in the RAM before the closing of the two consecutive ignition switches), and this addition result is updated as the number 2 of preceding first rectangular wave pulses.

Next, in step 142, the CPU reads out the count value of the second pulse counter, that is, the second rectangular wave pulse number fo, and at the same time resets the second pulse counter to start counting again. 2 square wave pulse number fo
is added to the number f of preceding second rectangular wave pulses (stored in the RAM before the above-mentioned ignition switch is closed), and the addition result is updated as the number f of preceding second rectangular wave pulses. At this stage, since the first timer counter of the CPU has not generated the first time measurement completion signal, step 14 is executed.
After the determination in step 6 becomes [oJ, the display control program executes the data display routine 150 (FIGS. 3 and 4).
Referring to D), the CPU, in step 151,
In response to this, the controller 80 stores the contents of the coordinate plane display command signal for the coordinate plane display pattern already stored in the ROM. Furthermore, at this stage, CP
Since the second timer counter of U has not generated the second time measurement completion signal, the determination in step 152 is "NO", and the display control program executes the data clear routine 12.
Return to 0.

During the repetition of the above calculations, the first timer counter of the CPU generates a first time measurement completion signal, and the determination in step 146 of the data collection routine 140 is I-Y.
KSj, the CPU in step 144
Simultaneously with resetting the timer counter, time measurement is started again, and in step 145, an index f is determined based on the running integer part of the vehicle in relation to the latest preceding first rectangular wave pulse number 2 in step 141. Then, in step 146, the CPU executes steps 141 and 14.
2, the fuel efficiency η of the vehicle is determined by the relationship between the latest number of preceding first rectangular wave pulses 2 and the number of preceding second rectangular wave pulses f.
Calculate. Then, as understood from the above, since the number of data N(1) related to index 2 in step 145 has been cleared, the CPU determines [NOJ] in step 147, and then returns to step 1.
In step 48, the number of data is updated to N (1) -1 in relation to the index ■ in step 145, and A(1) - 〇, N (1) - 1 is added to the following arithmetic average calculation formula (1) for fuel efficiency.
Then, the calculated value η in step 146 is substituted to update the fuel consumption data A(1)=η.

Thereafter, if the traveling speed of the vehicle is accelerated to, for example, about 110 b/h, step 146 is performed in this acceleration process.
Each time the determination in is l'-YESJ, a different index is determined in step 145, the fuel efficiency η is calculated in step 146, and the latest index value in step 145 is determined in step 148, as in the case described above. The number of data N (1) related to is updated by adding 11'', and this updated data number N (I), Step 1
The latest fuel efficiency η in 46 and the fuel efficiency data A(1) obtained in the previous step 148 are substituted into the arithmetic average calculation formula (1), and the result is calculated as the fuel efficiency data A(1) related to the latest index Update as. When the second timer counter of the CPU generates the second timer counter and the determination in step 152 is made, the CPU resets the second timer counter in step 153 and at the same time starts timing again, and runs the display control program. The first fuel consumption curve creation routine 154 (in Fig. 4) and the fifth
(See figure).

Therefore, in step 154a of FIG.
The maximum value of index 2 related to the number of data N(1) to 0 (
max) is set to another index J, and in step 154b, index 2 is set to 0, and in step 154c, the index value is ovcr1''.
j is added and the index knee is updated to 1. When the first fuel efficiency curve creation routine 154 proceeds to step 154d,
The CPU stores the fuel efficiency data A (1), A (2) already stored in the RAM in relation to Knee 1, as well as the fuel efficiency data A (0) and the weighting coefficient Ko, which are stored in the ROM in advance.
(1>Ko>K+>0, and 1"" for KO+2
The weighted average calculation formula (2) for the following fuel efficiency is used to calculate the average fuel consumption Y (1) - KoA (1) 1/10 (A (0)
+A (2)). In addition, fuel efficiency data A (
0) is determined to be a predetermined value based on the fuel efficiency characteristics of the vehicle.

Y (I) = KoA (1) ten, Σ Kt (A (knee r)
10A(I+r)J-...(2)-1 Next, when the first fuel consumption curve creation routine 154 proceeds to step 154e, the CPU sets the abscissa to knee 1 and the ordinate to Y(1)-Ko A(1 ) 10Kt (A(0)+
A(2)), and a coordinate display pattern corresponding to both of these coordinates is generated as a first coordinate display command signal and applied to the controller 80. Thereafter, step 154 based on
Each time the determination at f becomes NOJ, step 154
Addition update of index 2 in C, calculation of average fuel consumption Y (I) in step 154d in relation to this addition update result, and first coordinates related to this average fuel consumption Y (I) and the latest index 2 in step 154e. The generation of the display command signal and its application to the controller 80 are repeated, and when it becomes I-J, step 154f
The determination in is ``YESJ''.

In this example, each weighting coefficient is I=1, 2°・
..., r are separately stored in the ROM in advance, and in this case, 1) Ko) K, -...) Kr)
0 and Ji K. Σ2Ki=1, and weighting coefficients related to different in1=1 detoxes are not necessarily equal to 1.

As mentioned above, the series of first coordinate display command signals are sent to the CPU.
When the signals are sequentially applied to the control signal 80, the controller 80 sequentially matches the contents of each first coordinate display command signal with each part of the coordinate plane display pattern corresponding to each of these contents and integrally displays them as display data. At the same time as being stored, this display data is generated as a video signal together with a synchronization signal.

Then, the CRT display 90 responds to the video signal and synchronization signal from the controller 80 and displays the average fuel consumption of the vehicle in relation to the traveling speed on the coordinate plane S as a fuel consumption curve L1, as illustrated in FIG. indicate.

Thereby, the driver can recognize from the display contents of the CR7 display 90 at what speed the vehicle should be driven to achieve economical fuel efficiency. In such a case, the fuel consumption curve L
1 is I'ff in both steps 148 and 154d
Since it is calculated based on the i-added average calculation formula (1) and the weighted average calculation formula (2), it becomes a smooth and highly accurate curve.

If the second operation switch 20 is operated in such a state, the CPU determines "YES" based on the second operation signal generated from the second operation switch 20 in step 161 (see FIG. 4(B)). Then, in step 162, the fuel efficiency data A, (I) and the number of data N(1
) are set as the saved fuel efficiency data B(1) and the number of saved data M(1) for all of the index ■, respectively, and the fuel efficiency data A(1) and the number of data N(I) are all cleared. For example, if the vehicle is traveling at about 110 b/h and is to be decelerated,
In this deceleration process, the calculations in the data collection routine 140 are repeated in substantially the same way as in the case described above, and when the determination in step 152 of the data display routine 150 is IYEsJ, the CPU performs the calculation in the first fuel efficiency curve creation routine 154. , in the same way as in the case already described, the average fuel consumption Y is determined by the addition update of the index I
The calculation in (1) and the generation of the first coordinate display command signal are repeated. Then, the CR7 display 90 responds to a series of coordinate display command signals from the CPU and, in cooperation with the controller 80, displays the average fuel consumption of the vehicle on the coordinate plane S in relation to its traveling speed as shown in FIG. As shown in the example, the fuel consumption curve L2 is displayed. However, it is assumed that the fuel efficiency conditions during the acceleration process and deceleration process of the vehicle described above are different from each other.

Next, when the data display routine 150 proceeds to the second fuel efficiency curve creation routine 155, in step 155a, C'PU calculates the maximum value of the index 2 related to the number of stored data M(1) to O by other methods. The index knee is set to P, the index knee is set to 0 in step 155b, and the index knee is set to 1 in step 154C.
and update. Then, in step 155d, the CPU retrieves the stored fuel efficiency data B(0), B(1), B(2) and RO stored in the RAM due to the relationship with ■=1.
From the weighted average calculation formula (3) of the fuel efficiency stored in M, the weighted coefficient KO, which is stored in M, is calculated according to the weighted coefficient KO, which is 1, to calculate the average saved fuel consumption Y (1)
”” Ko B(1)+K 1(B(0)+B(2
)).

Y(1)=KoB(I) 10, ΣKt(B(I-r)10B
(I+r))-(8)-1 However, in equation (3), the weighting coefficients Ko and 1 are the same as those in equation (2).

Next, when the second fuel efficiency curve creation routine 155 proceeds to step 155θ, the CPU sets the abscissa to knee 1 and the ordinate to y(1)−KoB(1)++(B(0)×B(
2) The controller 80 generates a coordinate display pattern corresponding to these two coordinates as a second coordinate display command signal.
granted to. Thereafter, each time the determination in step 155f becomes "NO" based on IsP, the index 2 is added and updated in step 155C, and the average saved fuel consumption Y in step 155d is updated in relation to the addition update result.
The calculation of (1), this average storage twist 17-cost Y(1), and the generation and application of the second coordinate display command signal related to the latest index ■ in step 155e to the controller 80 are repeated. When P, the determination in step 155f becomes ['YESJ.

As mentioned above, the series of second coordinate display command signals are sent to the CPU.
are sequentially applied to the controller 80, the controller 80 sequentially matches the contents of each second coordinate display command signal with each part of the coordinate plane display pattern corresponding to each of these contents, and integrally stores them as display data. At the same time, this display data is generated as a video signal together with a synchronization signal.

Then, the CR7 display 90 responds to the video signal and synchronization signal from the controller 80 and displays a fuel consumption curve L on the coordinate plane S.
Display 1. Thereby, the driver can confirm that the fuel efficiency in the current driving state of the vehicle is relatively improved due to the relationship between the fuel efficiency curve L2 displayed on the C'RT display 90 and the fuel efficiency curve Ll. . In such a case, the fuel efficiency curve L2 becomes a smooth and accurate curve for the same reason as the fuel efficiency curve L1.

In the above operation description, if the determination in step 147 is "YESJ", the CPU in step 149 replaces the arithmetic mean calculation formula (1) with the following arithmetic mean calculation formula (4). ) is used to obtain fuel efficiency data A(I).

In addition, in the above explanation of the operation, when the ignition switch of the vehicle is opened, the contents stored in the RAM immediately before the ignition switch was opened are stored as they are even after the ignition switch is opened, so there is no possibility that errors will occur in the calculation contents of the CPU. do not have. In such a case, substantially the same effect as described above can be obtained even if the running state of the vehicle is not limited to acceleration or deceleration and there are various changes in the running speed.

Further, in the above embodiment, both fuel consumption curves L1 and L2 were displayed as solid lines, but instead of this,
For example, one of the two fuel efficiency curves "1 +" and "2" may be displayed as a broken line.

As explained above, in the present invention, as exemplified in the above embodiment, the traveling distance of the vehicle per predetermined traveling time is detected as the first detection signal, and the fuel is supplied from the fuel supply source of the vehicle to the internal combustion engine. The amount of fuel that remains for a predetermined supply time is detected as a second detection signal, and a coordinate plane formed by a pair of coordinate axes that respectively scale the traveling speed and fuel consumption of the vehicle is stored in advance as a coordinate plane display pattern, and a predetermined count is performed. The traveling speed and fuel efficiency of the vehicle are repeatedly calculated based on the numbers of the first and second detection signals that occur during the elapse of the predetermined counting time each time, and the driving speed and fuel consumption of the vehicle are determined by the results of each pair of calculations. Each coordinate is sequentially integrated with the coordinate plane display pattern as a coordinate display pattern to create display data, and this is generated as an output signal, and in response to this output signal, the respective coordinates are displayed on the coordinate plane for the vehicle concerned. A distinctive feature of the structure is that the fuel consumption of the vehicle is displayed in relation to the vehicle's travel speed. As a result, according to the present invention, changes in the fuel efficiency of a vehicle are displayed linearly in relation to changes in its running speed, so that the driver can determine at what speed the vehicle is being driven based on the displayed content. If you drive, you can easily judge whether the fuel consumption is economical or not, which can help you improve your own driving method.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is an exemplary display diagram of the CRT display of FIG. 1, and FIGS. This is a flowchart 1 showing the action of. Explanation of symbols 60...Speed sensor, 40...Fuel sensor, 70-
1 microcomputer, 80 - controller, 90
...CRT display. Applicant Nippondenso Co., Ltd. Agent Patent Attorney Teru Hase - Figure 1 Figure 2 90 Figure 3 SL! 1 Figure 6

Claims (1)

[Claims] The distance traveled by the vehicle per predetermined traveling time is detected and calculated as the first
a first detection means that generates a detection signal; and a second detection means that detects the amount of roar of fuel supplied to the internal combustion engine from the fuel supply source of the vehicle for a predetermined counting period and generates this as a second detection signal.
A coordinate plane formed by a detection means and a pair of coordinate axes that respectively scale the traveling speed and fuel consumption of the vehicle is stored in advance as a coordinate plane display pattern, and each time a predetermined counting time elapses, a coordinate plane is generated during the elapse of the predetermined counting time. The traveling speed and fuel consumption of the vehicle are repeatedly calculated based on the numbers of the first and second detection signals, and each coordinate defined by each pair of calculation results is sequentially integrated into the coordinate plane display pattern as a coordinate display pattern. a data generating means for generating display data by converting the data into data, and generating the display data as an output signal; A fuel efficiency display device for a vehicle, comprising display means for displaying fuel efficiency.