JP2001194204A - Display device for remaining running distance for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device, for a remaining running distance for a vehicle, by which the remaining running distance for the vehicle is displayed precisely. SOLUTION: The display device for the remaining running distance for the vehicle is ensured in such a way that the fuel detection signal S1, the vehicle speed signal S2 and the fuel consumption signal S3 of the vehicle are used, that the output signal of a remaining fuel value f in which the fuel detection signal is delay-processed B11 by a remaining fuel measuring block B1 is transmitted to a refueling judgment block B2 so as to judge whether a refueling operation is required or not, that, when it is judged that the refueling operation is required, the precise remaining fuel value f is sent to a remaining-running- distance computing block B3, that the remaining fuel value f is updated and that the remaining running distance (a) is computed so as to be displayed on a remaining-running-distance display means D3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As shown in FIG. 5, a vehicle remaining mileage display device according to the prior art is provided with a fuel detection signal (S) for a vehicle equipped with an engine that runs using fuel such as gasoline.
1), a vehicle speed signal (S2) and a fuel consumption signal (S3) as input signals, a remaining fuel measurement block (B1), a refueling determination block (B2), and a remaining travel distance calculation block (B
3) and outputs the remaining fuel (D1) means and the remaining mileage display (D
3) Display the remaining fuel and remaining mileage by means, respectively.
Then, in the remaining fuel measurement block, the conversion process (B1
0) means for converting the fuel detection signal into a residual fuel value, transmitting an output signal of the converted residual fuel value (f) to the refueling determination block, and performing the conversion processing. The output signal of the residual fuel value (f) is subjected to delay processing of the residual fuel value using delay processing (B11) means having a predetermined time constant, and the residual fuel value (f ) Output signal
The remaining fuel display means displays on a vehicle operation panel or the like, while the refueling determination block uses the vehicle speed signal of a pulse number proportional to the wheel rotation speed, and sets the vehicle speed signal per predetermined time as a vehicle speed V, If the stop state V = 0 is detected, the value (f) of the remaining fuel subjected to the conversion processing is received, and f = A
The value A is stored in the storage unit, the vehicle waits for the vehicle speed V to _{reach the} minimum vehicle speed _Vmin at the time of refueling determination, the value (f) of the remaining fuel at the time of V = _Vmin is accepted, and f = B , From the storage unit,
The value is read out, and the magnitude of the absolute value of ( _BA ) relative to the minimum remaining fuel comparison value f _min at the time of refueling determination is compared using comparison processing means. If the absolute value ( _BA ) <f _min , It is determined that there is no refueling, and if the absolute value ( _BA )> _fmin , it is determined that refueling is present, the remaining fuel value f = B at the present time is sent to the remaining travel distance calculation block, and the remaining travel distance a is calculated. The remaining fuel value f used for the calculation of the above was updated.

[0003]

In the vehicle remaining travel distance display device according to the prior art, a fuel detection signal (S1) is obtained by a conversion processing (B10) means in a refueling determination block (B2).
Is converted to the value of the remaining fuel, and the output signal of the value (f) of the remaining fuel subjected to the conversion process is used. Therefore, in an abnormal operation state such as sudden start, the fuel measurement level surface inside the fuel container sharply changes. Vibration occurs, and the output signal of the value (f) of the residual fuel subjected to the conversion process as an input signal to the residual fuel measurement block rapidly changes, and the vehicle waits _{until the} vehicle speed V becomes the minimum vehicle speed _Vmin at the time of refueling determination. When the value (f) of the remaining fuel at the time of V = V _min is received and f = B, an erroneous f = B is likely to be selected, and the absolute value (B− A)> f
not only erroneous _min but also an erroneous residual fuel value f = B,
It is sent to the remaining mileage calculation block (B3) to calculate an incorrect remaining mileage a, and the remaining mileage is displayed large even though there is no fuel, which also has a safety problem.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a vehicle remaining travel distance display device according to the present invention uses a residual fuel measurement block (B1) that has been subjected to a delay process and that does not fluctuate rapidly. The output signal of the value (f) is transmitted to the refueling determination block (B2), the refueling determination is performed, and when it is determined that refueling is present, the accurate remaining fuel value f = B is calculated by the remaining travel distance calculation block (B3). ) And updated.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle remaining mileage display device according to the present invention uses a fuel detection signal, a vehicle speed signal, and a fuel consumption signal as input signals in a vehicle equipped with an engine that runs using fuel such as gasoline, and uses the remaining fuel as an input signal. The remaining fuel and the remaining mileage are displayed on the remaining fuel display means and the remaining mileage display means using the output signals from the various blocks. The display circuits constituting the various blocks include an input conversion circuit for processing the various input signals, a central processing unit (CP) for performing arithmetic processing, comparison processing, and control processing.
U), a storage unit for storing various variables, and a drive circuit for outputting various output signals. In the residual fuel measurement block, the conversion unit converts the fuel detection signal into a value of residual fuel. The remaining fuel value is delayed by using delay processing means having a predetermined time constant, and the output signal of the delayed fuel value (f) subjected to the delay processing is output to the vehicle operation panel by the remaining fuel display means. Display on the display, and also the output signal
Transmitted to the refueling determination block, using the vehicle speed signal of the pulse number proportional to the wheel rotation speed, setting the vehicle speed signal per predetermined time to the vehicle speed V, and detecting the stop state V = 0, the delay processing means The value (f) of the remaining fuel that has been subjected to the delay processing is received, f is set to A, the A value is stored in the storage unit, and the control waits _{until the} vehicle speed V becomes the minimum vehicle speed _Vmin at the time of refueling determination. = V
The value (f) of the remaining fuel at the time point _min is received, f = B, the A value is read from the storage unit, and the value of the minimum remaining fuel comparison value f _min at the time of refueling determination with respect to the absolute value of (BA) is obtained. The magnitude is compared using the comparison processing means, and the absolute value (B−A) <f _min
, It is determined that there is no refueling, and the absolute value (BA)> f
If it is _min , it is determined that refueling is present, the remaining fuel value f = B at the present time is sent to the remaining mileage calculation block, and the remaining fuel value f used for calculating the remaining mileage a is updated. , Returning to the first start stage, and monitoring the next stop state V = 0 at a predetermined repetition time.

The remaining running distance of the vehicle remaining running distance display device of the present invention.
After the start stage, the distance calculation block calculates the starting distance L.
Period setting L = 0, and using the vehicle speed signal,
Start the measurement and the unit mileage L_minFuel consumption per
Initial setting d = 0, and there is lubrication in the lubrication determination block
At the time of judgment, the remaining fuel value f is updated,
If there is not, go through and go to the next stage.
Initial value of remaining fuel value f at the time of ignition 0N
Is the value of the remaining fuel value f at the time of the last ignition OFF.
The final value is stored in the storage unit, and the final value is stored in the storage unit.
f, and the remaining fuel value f is initialized.
From the fuel consumption signal (S3) as the engine pulse,
The fuel consumption over time is measured, and the total d = d +
b, and the current remaining fuel value f = f−b is calculated.
Moving to the stage, the current mileage L is calculated as the unit mileage L_minTo
Return to the refueling residual fuel update stage until L = L_min
When it becomes, it moves to the next stage and stored in the storage unit in chronological order.
n unit traveling distances L_minThe latest n-th time series
Memory consumption fuel D_n, And D₁, D_Two..D _n
The latest time-series rearrangement, and proceed to the next stage.
D₁, D_Two..D_nIs taken out, and the addition sum D = ΣD_iAct
And the remaining mileage a = (fL_min・ Calculate n) / D
And the remaining mileage a is secured by using the remaining mileage display means.
Displayed on the vehicle operation panel,
Returning, this process is taken as the unit mileage L_minI also have to do it every time
come.

In the vehicle remaining travel distance display apparatus of the present invention, the output signal of the value (f) of the remaining fuel subjected to the delay processing is an analog signal, and the remaining fuel display means uses a meter having an opening of about 80 degrees. The time constant of the processing means can be about 30 seconds / degree.

In the vehicle remaining travel distance display device of the present invention, the output signal of the value (f) of the remaining fuel subjected to the delay processing may be a digital signal, and the remaining fuel display means may be digitally displayed.

In the vehicle remaining mileage display device of the present invention, a vehicle speed signal having a plurality of pulses generated per one rotation of a wheel is used, and in a refueling determination block setting processing step, a minimum vehicle speed _Vmin at the time of refueling determination = speed / hour. In the next stage, the minimum remaining fuel comparison value f at the time of refueling judgment is adopted.
_min = 10 l can be adopted.

[0010] In the vehicle remaining traveling distance display device of the present invention, the unit travel distance L _min of the remaining travel distance calculation block 1
km, the maximum storage number n of the latest time-series storage fuel consumption is several tens, and the storage unit is a readable / writable storage element (R
AM), the power is supplied to the storage unit even when the ignition is turned off, and the remaining time-distance stored fuel consumption is estimated using the fuel consumption addition value corresponding to several tens of km. You can also.

In the vehicle remaining mileage display device of the present invention, at the time of replacement of the storage battery, the storage section erases the contents of the readable / writable storage element (RAM), so that the refueling remaining fuel in the remaining mileage calculation block is updated. In the stage, at the time of ignition 0N, the value (f) of the remaining fuel subjected to the delay processing is received from the delay processing means, and the remaining fuel f is updated. Further, in the fuel consumption updating stage, the storage unit (C4
Storing in time series in 2), the latest time-series storage fuel consumption D _i per n unit travel distance L _min is also stored from the beginning to sequentially n number, at the next step, each of the latest time-series storage consumed fuel quantity , The remaining traveling distance a can be calculated.

In the vehicle remaining mileage display device of the present invention, the output signal of the value (f) of the remaining fuel subjected to the delay processing in the remaining fuel measurement block is transmitted to the refueling determination block, and the refueling determination is performed. In an abnormal operation state such as starting, the fuel measurement level surface inside the fuel container vibrates rapidly, and even if the fuel detection signal as an input signal to the remaining fuel measurement block changes abruptly, a flat and stable delay is obtained. Since the processed output signal is received and the refueling determination is performed, it has the effect of greatly reducing malfunctions in the determination, and if it is determined that refueling is present, the effect of ensuring an accurate remaining fuel value f = B. And sends the remaining fuel value f = B to the remaining travel distance calculation block to calculate an accurate remaining travel distance a.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings of the embodiment of the present invention, FIG. 1 is a schematic mechanism block diagram of a vehicle remaining traveling distance display device, FIG. 2 is a function flowchart of a refueling judgment block in the schematic mechanism block diagram, and FIG. It is a functional flowchart of a running distance calculation block. FIG. 4 is a configuration diagram of a vehicle remaining traveling distance display device showing an embodiment of the present invention. For comparison, FIG. 5 shows a schematic block diagram of a mechanism of a vehicle remaining traveling distance display device showing an embodiment according to the prior art.

An embodiment of the present invention will be described below. As shown in FIG. 1, a vehicle remaining traveling distance display device is provided with a fuel detection signal (S1), a fuel detection signal (S1), for a vehicle equipped with an engine traveling using fuel such as gasoline. The vehicle speed signal (S2) and the fuel consumption signal (S3) are used as input signals, and the remaining fuel measurement block (B
1), input to the refueling determination block (B2) and the remaining mileage calculation block (B3), and use the output signals from the various blocks to display the remaining fuel (D1) means and the remaining mileage display (D3) means. And a display circuit (C4) for displaying the remaining fuel and the remaining mileage, respectively, and constituting various blocks.
As shown in FIG. 4, an input conversion circuit (C40) for processing various input signals, a central processing unit (CPU) (C41) for performing arithmetic processing, comparison processing, and control processing, and a storage for storing various variables (C42) and a drive circuit (C43) for outputting various output signals.

In the vehicle remaining distance display device according to the embodiment of the present invention, the fuel detection signal (S1) is an analog signal having a length dimension relating to the height of the remaining amount of fuel in the fuel storage container, In the measurement block (B1), the analog signal is converted into a value of remaining fuel by a conversion processing (B10) means, and a delay processing (B11) means having a predetermined time constant is used to delay the value of the remaining fuel. The output signal of the value (f) of the residual fuel which has been subjected to the delay processing and is subjected to the delay processing is displayed as a residual fuel indication (D
1) Display on the vehicle operation panel by means, and also transmit the output signal to the refueling determination block (B2).

In the vehicle remaining travel distance display apparatus according to the embodiment of the present invention, the output signal of the value (f) of the remaining fuel subjected to the delay processing employs an analog signal, and the remaining fuel display (D1) means has an opening degree of about An 80-degree meter was used, and the time constant of the delay processing (B11) means was 30 seconds / degree.

In the vehicle remaining traveling distance display apparatus according to the embodiment of the present invention, the refueling determination block (B2), as shown in FIG. 2, generates a vehicle speed signal (S2) having a predetermined number of pulses generated per one rotation of the wheel. When the stop state V = 0 is detected in step (B20), the process proceeds to step (B21) and delay processing (B1) is performed.
1) The value (f) of the remaining fuel subjected to the delay processing is received from the means, f = A, the A value is stored in the storage unit (C42), and the process proceeds to step (B22). Minimum vehicle speed V
_min , the value (f) of the remaining fuel at the time of V = V _min is received, f = B, and the process proceeds to step (B23).
The value A is read from the storage unit, and the magnitude of the absolute value of (BA) is compared with the minimum remaining fuel comparison value f _min at the time of refueling determination using comparison processing means, and the absolute value (BA) < f
If it is _min , it is determined that there is no refueling, and the absolute value (BA)>
If f _min , the process proceeds to step (B24), it is determined that refueling is present, the remaining fuel value f = B at the present time is sent to the remaining travel distance calculation block (B3), and used for calculating the remaining travel distance a. It is used to update the remaining fuel value f, and when the step (B24) is completed, it returns to the first start step again and monitors the next stop state V = 0 at a predetermined repetition time.

In the vehicle remaining travel distance display apparatus according to the embodiment of the present invention, a vehicle refueling determination block (B2) is used by using a vehicle speed signal (S2) of eight pulses generated per rotation of a wheel.
In step (B22), the minimum vehicle speed _Vmin at the time of refueling determination
= Approximately 5.7 km / h, and in step (B23), the minimum remaining fuel comparison value f _min = 10 l at the time of refueling determination was employed.

In the vehicle remaining mileage display device according to the embodiment of the present invention, the remaining mileage calculation block (B3) sets the initial setting L = 0 of the mileage L in step (B30) as shown in FIG. Then, the measurement of the travel distance L is started using the vehicle speed signal (S2), and the process proceeds to step (B31), where the initial setting d = 0 of the fuel consumption d per unit travel distance L _min is performed, and the step (B32) And refueling judgment block (B2)
The remaining fuel value f is updated at the time of determination that there is refueling from the step (B24), and if there is no determination that there is refueling, the fuel tank passes and the process proceeds to step (B33).
As the initial setting value of the remaining fuel value f at the time point N, the final value of the remaining fuel value f at the time of the previous ignition OFF is stored in the storage unit (C42), and the final value f is stored from the storage unit. Then, the remaining fuel value f is initialized, the process proceeds to step (B33), and the fuel consumption per unit time is measured from the fuel consumption signal (S3) as the engine pulse, and the total d = d + b of the fuel consumption d is measured. And proceeds to step (B34) to calculate the current remaining fuel value f = f−b, and then to step (B34).
35), the current mileage L is calculated as the unit mileage L _min
Until, returned to step (B32), if made to L = L _min, step moves to (B36), and stores in time series in the storage unit (C42), the latest per n unit travel distance L _min While updating the _nth stored fuel consumption D _n in the time series,
The latest time series rearrangement of ₁ , D ₂ ... D _n is performed, and the stage (B3
Moves to 5), remove the D _1, D ₂ ·· D _n from the storage unit, and calculates the addition sum D = .SIGMA.D _i, remaining travel distance a = (f ·
L _min · n) / D, the remaining mileage a is secured, displayed on the vehicle operation panel using the remaining mileage display (D3) means, and when the operation is completed, the process returns to the start stage. This is performed every unit traveling distance _Lmin .

In the vehicle remaining mileage display device according to the embodiment of the present invention, the unit mileage L _min of the remaining mileage calculation block (B3) is set to 1 km, and the maximum number of stored fuel of the latest time series storage fuel n = 32 is adopted. Since the storage unit (C42) uses a readable and writable storage element (RAM), power is supplied to the storage unit even when the ignition is turned off.
For the latest time-series stored fuel consumption, the remaining travel distance a can be estimated using the fuel consumption addition value corresponding to 32 km.

In the vehicle remaining traveling distance display device according to the embodiment of the present invention, the storage unit (C4
In step 2), the contents of the readable / writable storage element (RAM) are erased, so that the step (B3) of the remaining travel distance calculation block (B3) is executed.
In 2), at the time of ignition 0N, the value (f) of the remaining fuel subjected to the delay processing by the delay processing (B11) means
Is received, and the remaining fuel f is updated.
In 36), and stores in time series in the storage unit (C42), the latest time-series storage fuel consumption D _i per n unit travel distance L _min is also stored from the beginning to sequentially n number, step (B
At 37), the remaining travel distance a is calculated according to each latest time-series stored fuel consumption quantity.

[0022]

The present invention is embodied in the form described above and has the following effects.

The vehicle remaining mileage display device of the present invention transmits the output signal of the value (f) of the remaining fuel subjected to the delay processing to the refueling determination block to perform refueling determination. In this state, even if the fuel measurement level surface inside the fuel container vibrates abruptly and the fuel detection signal (S1) as an input signal to the remaining fuel measurement block changes abruptly, a flattened stable delay process is performed. Since the refueling determination is performed using the output signal that has been applied, the malfunction of the determination is greatly reduced. When it is determined that refueling is present, the accurate remaining fuel value f is determined.
= B, and has the effect of displaying the accurate remaining travel distance a.

The vehicle remaining mileage display device of the present invention displays the accurate remaining mileage a, so that the remaining fuel display value and the remaining mileage display value do not contradict each other, and an effect of ensuring safe vehicle operation. Having.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a vehicle remaining travel distance display device according to an embodiment of the present invention.

FIG. 2 is a functional flowchart of a refueling determination block in a schematic mechanism block diagram of the vehicle remaining traveling distance display device according to the embodiment of the present invention.

FIG. 3 is a functional flowchart of a remaining mileage calculation block in a schematic mechanism block diagram of the vehicle remaining mileage display device, showing an embodiment of the present invention.

FIG. 4 is a configuration diagram of a vehicle remaining mileage display device showing an embodiment of the present invention.

FIG. 5 is a schematic block diagram of a mechanism of a vehicle remaining traveling distance display device showing an embodiment according to the prior art.

[Explanation of symbols]

a Remaining mileage b Fuel consumed per unit time d Fuel consumed per unit mileage L _min f Fuel remaining f _Min Minimum remaining fuel comparison value at fueling judgment n Latest time series storage Maximum number of stored fuel consumption B1 Remaining fuel measurement block B2 refueling determination block B3 remaining travel distance calculation block C4 display circuit D1 remaining fuel display D3 remaining traveling distance display D D = .SIGMA.D _i D _i unit travel distance L latest time series i th storage fuel consumed per _min L travel distance L _min Unit traveling distance S1 Fuel detection signal S2 Vehicle speed signal S3 Fuel consumption signal V Vehicle speed V _min Minimum vehicle speed at fueling judgment

Claims (1)

[Claims] 1. A fuel detection signal (S1), a vehicle speed signal (S2) and a fuel consumption signal (S3) of a vehicle are converted into a remaining fuel measurement block (B1), a refueling determination block (B2), and a remaining travel distance calculation block (B3). ), And displays the remaining fuel display (D1) means and the remaining mileage display (D3) means using output signals from the various blocks. An input conversion circuit for processing various input signals, a central processing unit for performing arithmetic processing, comparison processing, and control processing, a storage unit for storing various variables, and a drive circuit for outputting various output signals. In the remaining fuel measuring block, the conversion process (B10) converts the fuel detection signal into a value of the remaining fuel, and uses a delay processing (B11) having a predetermined time constant to delay the value of the remaining fuel. Processing, an output signal of the value (f) of the residual fuel subjected to the delay processing is displayed by the residual fuel display means, and the output signal subjected to the delay processing is transmitted to the refueling determination block. The vehicle speed signal per predetermined time is set to the vehicle speed V, and if the stop state V = 0 is detected, the value (f) of the remaining fuel subjected to the delay processing is received, and f = A, A
The value is stored in the storage unit, and the vehicle speed V is the minimum vehicle speed V at the time of refueling determination.
_min , the value (f) of the remaining fuel at the time of V = V _min is accepted, f = B, the A value is read from the storage unit, and the refueling for the absolute value of (BA) is performed. The magnitude of the minimum remaining fuel comparison value f _min at the time of the determination is compared using the comparison processing means. If the absolute value (B−A) <f _min , it is determined that there is no refueling, and the absolute value (B−A) If> f _min , it is determined that refueling is present, the remaining fuel value f = B at the present time is sent to the remaining mileage calculation block, and the remaining fuel value f used for calculating the remaining mileage a is updated. Vehicle remaining mileage display device characterized by the following.