JP2833424B2 - Driving distance display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a travelable distance display device for displaying a travelable distance of a vehicle.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 61-2 / 1986
No. 77019 and Japanese Utility Model Application Laid-Open No. Sho 62-1121. In Japanese Utility Model Laid-Open Publication No. Sho 62-1121, the travelable distance is obtained and displayed based on the average fuel consumption rate (average fuel efficiency) and the remaining fuel amount. As described above, when the average fuel efficiency over a long time is used, the display content of the travelable distance becomes stable, but the followability is poor. Therefore, the travelable distance in the current traveling state can be displayed by calculating the travelable distance based on the short-time fuel efficiency and the remaining fuel amount immediately before the current time.

[0003]

However, if the travelable distance is obtained and displayed based on the short-time fuel consumption and the remaining fuel amount immediately before the present, the change in the traveling state and the engine of the internal combustion engine are displayed.
The state of the load, the short fuel just before the current changes, the display content increases or decreases the display contents of the travel distance becomes unstable. For example, when traveling uphill on a slope
Is the short-time fuel consumption just before the current
Deterioration due to hills, etc.
In the case of driving, the fuel economy of the short time just before the present is good
Becomes Therefore, in the case of the above method, traveling is possible when climbing a hill.
Noh distance becomes shorter, and if you go down a hill,
become longer. In addition, the use of vehicle air conditioners
Although the engine load naturally increases, fuel efficiency will deteriorate.
If the air conditioner is repeatedly turned on and off, fuel efficiency may deteriorate.
And good fuel economy alternate.
Can be driven by short-time fuel consumption and fuel remaining just before
When calculating and displaying the active distance, the travelable distance has increased.
Or decrease.

An object of the present invention is to provide a travelable distance display device capable of displaying a stable travelable distance in a running state close to the present.

[0005]

According to the present invention, as shown in FIG. 5, the immediately preceding fuel consumption calculating means M1 for calculating a short-time fuel consumption rate immediately before the present, and the immediately preceding fuel consumption calculating means M1.
Travel distance calculating means M2 for calculating the travelable distance from the fuel consumption rate obtained by the above and the current fuel remaining amount, display means M3 for displaying the travelable distance, and travelable distance calculation means M2. A display control means M4 for changing the display content of the travelable distance by the display means M3 to the latest travelable distance when at least one of the continuous increase or the continuous decrease of the travelable distance occurs.
The gist is a travelable distance display device having
You .

[0006]

[0007]

According to the present invention, the immediately preceding fuel consumption calculating means M1 calculates the short-time fuel consumption rate immediately before the current time, and the possible travel distance calculating means M2 calculates the fuel consumption rate obtained by the immediately preceding fuel consumption calculating means M1. Then, the possible travel distance is calculated from the current fuel remaining amount. The display control means M4 displays the display content of the travelable distance by the display means M3 when at least one of the continuous increase or the continuous decrease by the travelable distance calculation means M2 occurs continuously. Most
Change to a new mileage . As a result, the display means M3
Stabilizes the display content of the mileage that can be traveled. That is, even if the travelable distance by the travelable distance calculation means M2 repeatedly increases and decreases, the display content of the travelable distance displayed by the display means M3 is little changed, so that stable display is achieved.

[0008]

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of a travelable distance display device mounted on an automobile.

[0010] The fuel sender 1 measures the initial and remaining fuel at the time of refueling. An injector (fuel injection valve) 2 and a transistor 3 are connected in series to a power supply. When the transistor 3 is turned on, the injector 2 is energized, and fuel is injected into the engine. Here, the fuel injection amount is proportional to the ON time of the transistor 3.

The vehicle speed sensor 4 outputs a pulse signal having a cycle corresponding to the vehicle speed, and the running distance can be measured by counting the pulse signals. The refueling switch 5 is interlocked with the refueling opener, and is used to make a determination at the time of refueling.

The fuel sender 1 is connected via an interface 7 to the CPU 6 as the immediately preceding fuel consumption calculating means, the travelable distance calculating means, and the display control means.
The collector terminal of the transistor 3 is connected to the CPU 6 via the interface 8. Furthermore, CP
The vehicle speed sensor 4 is connected to U6 via an interface 9. Further, the refueling switch 5 is connected to the CPU 6 via the interface 10.

A display 12 as a display means is connected to the CPU 6 via a display drive circuit 11. The display 12 is arranged on an instrument panel of a vehicle. Then, the possible travel distance is displayed on the display 12.

Next, the operation of the thus configured travelable distance display device will be described. 3 and 4 show flowcharts for performing display by the display unit 12. FIG. 2 shows a processing routine for generating a fuel injection signal and a vehicle speed pulse using an interrupt (real-time input).

FIG. 2 shows a routine which is processed each time a drive signal of the injector 2 and a signal from the vehicle speed sensor 4 are generated.
In FIG. 2, interrupt processing is performed by generating the drive signal I1 of the injector 2 and the signal I2 from the vehicle speed sensor 4. The CPU 6 determines in step 100 whether or not the falling pulse (start of injection) of the driving signal I1 of the injector 2 is present, and if it is the falling pulse, starts measuring the ON time τ of the driving signal I1 of the injector 2 in step 101. . Then, the CPU 6 determines in step 102 whether or not the rising pulse (injection end) of the driving signal I1 of the injector 2 has been reached. If it is the rising pulse, the CPU 6 terminates the measurement of the ON time τ of the driving signal I1 of the injector 2 in step 103. . The CPU 6 adds the injection time τ to a preset register TF in step 104, and clears (= 0) the injection time τ in step 105.

In step 106, the CPU 6 falls the signal I2 from the vehicle speed sensor 4 (generation of a vehicle speed pulse).
Is detected, and 1/2548 is added to the traveling distance A in step 107 every time the signal falls. Here, 1/254
8 is an example of addition corresponding to the traveling distance in one pulse.

In FIG. 3, when the ignition switch is turned on, the process is started, and the CPU 6 determines whether or not the ignition switch has been turned on for the first time after the vehicle-mounted battery is connected in step 200. When the ignition switch is turned on, in step 201, the RAM is cleared and each port and flag are initialized. When the ignition switch is turned on for the second time or later after the battery is connected, the CPU 6 clears the data of the fuel remaining amount VF in step 202, and otherwise stores the data obtained when the ignition switch was turned off from the last time the ignition switch was turned on. Is used.

Then, the CPU 6 performs A / D conversion on the input signal (VF) from the fail sender 1 in step 203,
The remaining fuel amount VFn as a sender input is obtained. In step 204, the CPU 6 calculates the difference between the remaining fuel amount VFn and the remaining fuel amount VA consumed so far (= VFn-VA),
In step 205, it is determined whether or not the difference (= VFn-VA) has changed by more than a predetermined capacity (5 liters in this embodiment). Then, when a change equal to or larger than the preset capacity occurs, the CPU 6 determines that refueling has been performed, and replaces the data of the remaining fuel amount VA with the remaining fuel amount VFn in step 206.

Next, in step 207, the CPU 6 determines whether or not refueling is detected with the ignition switch on in accordance with the signal I3 from the refueling switch 5, and when the refueling is detected (I3
= 0), the remaining fuel amount is confirmed in steps 203 to 206.

The CPU 6 determines in step 208 whether or not the display update time (0.1 seconds) has been reached. When the display update time has come, the CPU 6 displays the travelable distance LD on the display 12 every 0.1 seconds in step 209. I do. Further, in step 210, the CPU 6 waits for an interval time (every minute in this embodiment) for calculating the current average fuel consumption rate (hereinafter, the fuel consumption rate is referred to as fuel consumption). Then, CPU 6 comes to 1 minute, the travel distance A 1 minute, which is integrated by an interrupt at step 211 is saved in the register Am, clear the travel distance A in Step 212 (= 0).

In step 213, the CPU 6 converts the one minute fuel injection time TF integrated by the interruption into a conversion coefficient α.
To obtain the fuel capacity Vu used for one minute.
Here, α is a coefficient for converting into a capacity. Then, the CPU 6 clears (= 0) the fuel injection time TF in step 214.

The CPU 6 determines in step 215 the remaining fuel amount VA.
The current fuel remaining amount VA is obtained by subtracting the fuel capacity Vu consumed for one minute from. Further, the CPU 6 executes step 2
At 16, the average fuel consumption dn per minute is calculated from the value of the register Am (the mileage per minute) and the fuel capacity Vu consumed per minute.
(= Am / Vu). The CPU 6 determines in step 217
Then, the latest travelable distance Ln in one minute running is calculated by multiplying the remaining fuel amount VA by the average fuel consumption dn in one minute.

Subsequently, at step 218 in FIG.
6 subtracts the travel distance Ln-1 calculated last time (n-1) from the current travel distance Ln, and determines in step 219 whether the subtraction value is positive or negative. Further, in steps 220 and 222, the CPU 6 calculates the travelable distance L calculated in the previous (n-1).
The travelable distance Ln-2 calculated from (n-1) two times before (n-2)
Is subtracted. Then, the CPU 6 performs steps 221 and 22.
At 3, it is determined whether the subtraction value (= Ln-1 -Ln-2) is positive or negative. The CPU 6 proceeds to step 224 when the travelable distance increases or decreases twice consecutively. CPU6
Performs a process for each remaining fuel amount VA in step 224. That is, when the remaining fuel amount VA is equal to or greater than 40 liters, the CPU 6 determines in step 225 that the change in the calculation result data (travelable distance) Ln and the display data (travelable distance) LD is one.
/ 3 is added to the current display data LD to update the display data LD. Similarly, when the remaining fuel amount VA is equal to or larger than 20 liters and smaller than 40 liters, the CPU 6 determines in a step 226 that the change of the calculation result data (travelable distance) Ln and display data (travelable distance) LD is 1/2. Is added to the current display data LD to update the display data LD. Further, when the fuel remaining amount VA is less than 20 liters, the CPU 6 displays the calculation result data Ln in step 227 while keeping the effect of the change of the calculation result data (travelable distance) Ln and the display data (runnable distance) LD unchanged. Let it be data LD.

As described above, when the remaining fuel amount VA is large, the slight influence of the fuel consumption has a large effect in proportion to the change amount of the travelable distance. Therefore, the running is performed by changing the ratio of the change amount that affects the fuel remaining amount VA. The stability of the possible distance display can be increased.

On the other hand, the CPU 6 determines (Ln
-Ln-1) is positive, and (Ln-
1-Ln-2) is negative, or (Ln
-Ln-1) is negative, and (Ln-
If 1-Ln-2) is positive, the processing of steps 224 to 227 is bypassed.

As described above, in the present embodiment, the CPU 6 (preceding fuel consumption calculating means; travelable distance calculating means, display control means).
Calculates the fuel efficiency (dn) for a short time immediately before the present time (step 216 in FIG. 3) and calculates the fuel efficiency (dn).
Then, the possible travel distance Ln is calculated from the current fuel remaining amount VA (step 217 in FIG. 3). Further, only when CPU6 is the increased or two consecutive <br/> reduced travelable distance Ln is continuously twice, display 12 (display means) latest possible traveling display content of DTE LD by The distance was changed (218 to 223 in FIG. 4). That is, even if the travelable distance Ln repeatedly increases and decreases, the display content of the travelable distance LD on the display unit 12 does not change, so that the display is stable.

The CPU 6 changes the display content of the travelable distance LD on the display 12 so that the change in the travelable distance becomes smaller as the remaining fuel amount VA increases with respect to the change in the travelable distance Ln ( Steps 224-2 in FIG.
27). That is, when the fuel remaining amount VA is large, the fuel consumption (dn)
The change in the travelable distance LD on the display 12 is stable because the change in the travelable distance becomes smaller as the fuel remaining amount VA increases. I do.

[0028]

The present invention is not limited to the above embodiment.
Rather, in the above embodiment, the display content of the travelable distance LD on the display 12 is changed only when the travelable distance Ln increases twice or continuously decreases two times. The number of consecutive times of the distance Ln may be three or more.

[0030]

As described in detail above, according to the present invention,
This provides an excellent effect that a stable travelable distance can be displayed for a traveling state close to the present.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a travelable distance display device according to an embodiment.

FIG. 2 is a flowchart for explaining the operation of a travelable distance display device.

FIG. 3 is a flowchart for explaining the operation of the travelable distance display device.

FIG. 4 is a flowchart for explaining the operation of the travelable distance display device.

FIG. 5 is a block diagram corresponding to a claim.

FIG. 6 is a block diagram corresponding to a claim.

[Explanation of symbols]

6 CPU as last-minute fuel consumption calculation means, travelable distance calculation means, display control means 12 Display as display means

Claims (1)

(57) [Claims] 1. An immediately preceding fuel consumption calculating means for calculating a short-time fuel consumption rate immediately before the present, and a travelable distance is calculated from the fuel consumption rate obtained by the immediately preceding fuel consumption calculating means and a current fuel remaining amount. Travelable distance calculation means, display means for displaying the travelable distance, and when at least one of continuous increase or continuous decrease in the travelable distance by the travelable distance calculation means has occurred. A display control means for changing the display content of the travelable distance by the display means to the latest travelable distance ;