JP2000146666A - Remaining fuel indicator for vehicles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately store the remaining quantity of a fuel, irrespective of the waving of the fuel liq. surface by storing the indicated value of remaining quantity of the fuel, based on the indicated value of remaining fuel quantity calculated after a fixed time elapsed from the ignition switch-off. SOLUTION: When a vehicle is horizontal and the ignition (IGN) switch is set off, the indicated value of remaining quantity of a fuel is stored after a fixed time elapsed from the ignition switch-off, i.e., in a stable state of the fuel liq. surface, thus accurately storing the indicated value of the remaining quantity, without being influenced by the waving of the fuel liq. surface, if any. When the IGN switch is off in a non-horizontal state, the indicated value of remaining fuel quantity shown in an indicating means 7 is stored in a memory means 8, and an indicated value of remaining fuel quantity obtained by canceling the change of the fuel liq. level in the fuel tank of the vehicle being stopping on a slope can be stored in the memory means 8. Thus the fuel remaining quantity subjected to the change of the fuel liq. level in the fuel tank of the vehicle being stopping on a slope is never indicated just after the IGN switch is set on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle for displaying a remaining fuel amount in a vehicle fuel tank based on an indication value of a remaining fuel amount stored when an ignition switch is turned on and immediately after the ignition switch is turned off. The present invention relates to a fuel level display device for a vehicle such as a fuel level gauge for a vehicle.

[0002]

2. Description of the Related Art Conventionally, a fuel gauge mounted on a vehicle is:
And a liquid level detecting means for detecting a liquid level of the fuel in the fuel tank. The liquid level detecting means has a contact that slides on the resistor according to the position of the float floating on the fuel level, and outputs a voltage obtained by dividing the voltage applied to both ends of the resistor to the contact. Such a configuration is generally employed.
Then, the electric characteristic of the liquid level detecting means, that is, the change of the output voltage is converted and the remaining amount of the fuel is displayed.

[0003] In such a vehicle fuel level display device, the liquid level in the fuel tank of the vehicle vibrates when the vehicle is tilted or vibrated, so that the liquid level in the fuel tank fluctuates. There has been a problem that the height of the float fluctuates and the needle gauge of the fuel gauge fluctuates, thereby reducing the reliability of the display of the fuel gauge. In order to solve this problem, there is known a conventional vehicle fuel remaining amount display device that displays a value when the float has been stable for a long time by delaying the response of the float to the fluctuation of the liquid level. However, this means that the float follows the fluctuation of the liquid level when running on a long slope on a long distance or stopping for a long time on a slope, and it is difficult to accurately detect the remaining fuel amount. There was a problem.

Further, it is necessary to display the increased amount of fuel immediately after refueling. However, if the display is delayed, there is a problem that the display of the correct amount of fuel is delayed. In order to solve the above problem, when the ignition switch is turned on, the remaining fuel amount detected at that time is displayed, but it is not possible to prevent the above-described erroneous display after parking on a sloped land. was there.

Various devices have been proposed to solve these problems. For example, in a vehicle fuel remaining amount display device described in Japanese Patent Application Laid-Open No. 3-282219, a vehicle immediately after an ignition switch is turned on. The fuel remaining amount is detected, and the detected value is compared with the stored indicated value of the remaining amount display at the time when the ignition switch is turned off. Assuming that the remaining amount has changed, a new remaining amount of fuel immediately after the ignition switch is turned on is indicated. On the other hand, when the difference between the two remaining amounts is less than the predetermined value, the remaining amount of fuel when the ignition switch was turned off last time is displayed.

[0006]

However, in the above-described conventional fuel remaining amount display device for a vehicle, the ignition switch is turned off when the liquid level of the fuel in the fuel tank is shaking immediately after the vehicle suddenly stops. In this case, the indicated value of the remaining fuel level is detected based on the liquid level in the fuel tank. There was a problem that the information was stored in the storage means in a state where it was included. Also,
In the above-described conventional fuel remaining amount display device for a vehicle, immediately after the ignition switch is turned on, the remaining fuel indication value is determined based on the remaining fuel indication value stored in the storage means. If the indicated value of the remaining amount includes an error, the remaining amount of fuel immediately after the ignition switch is turned on may not be accurately displayed.

For example, after the ignition switch is turned off, while the liquid level in the fuel tank fluctuates, the command value is stored in the storage means as a command value larger than the command value of the actual remaining fuel amount. When the fuel is supplied to the fuel cell, the difference between the instruction value of the remaining fuel amount detected immediately after the ignition switch is turned on and the stored instruction value becomes smaller than the actual fuel increase. For this reason, it is not recognized that fuel was replenished while the ignition switch was turned off, and the indication value of the remaining fuel amount stored when the ignition switch was turned off is displayed, and the fuel remaining amount display immediately after the ignition switch was turned on is displayed. In some cases, the fuel supply while the ignition switch was turned off was displayed without being reflected.

The present invention has been made in view of the above problems, and accurately stores the remaining amount of fuel without being affected by the fluctuation of the fuel level when the ignition switch is turned off. It is an object of the present invention to provide a vehicle fuel remaining amount display device that can perform the above operation.

[0009]

According to the first aspect of the present invention, there is provided a display device for displaying an indicated value, a combustion tank for a vehicle, as shown in a basic configuration diagram of FIG. A fuel sensor 1 for detecting a liquid level of the fuel in the fuel cell and generating a fuel signal; and a calculating means 33-1 for inputting the fuel signal from the fuel sensor 1 and calculating an indicated value of a remaining fuel amount.
Storage means 8 for storing the indicated value of the fuel remaining amount when the ignition switch is turned off, and holding the stored indicated value also during the period when the ignition switch is turned off.
And display control means 33-2 for controlling the display means 8 to display the indicated value of the remaining fuel amount and for storing the indicated value of the remaining fuel amount calculated by the calculating means 33-1 in the storage means 8. And the display control means 33-2
Immediately after the ignition switch is turned on, the indication of the remaining fuel amount stored in the storage means 8 is displayed on the display means 7.
The display control means 33-2 stores the indication value of the fuel remaining amount in the storage means 8 when the ignition switch is turned off after the ignition switch is turned off. A predetermined amount of time has passed since the calculation, and the calculation is performed based on the fuel remaining amount calculated by the calculating means 33-1.

With the above configuration, the display control means 33-2 for controlling the display means 7 to display the fuel remaining amount on the display means is provided immediately after the ignition switch is turned on. The display unit 7 displays the remaining fuel amount based on the indicated value of the amount. Since the indicated value of the remaining fuel amount is stored in the storage unit 8 after a lapse of a predetermined time after the ignition switch is turned off, the indicated value of the remaining fuel amount is stored in the storage unit 8, and thus the value is indicated after the sudden stop of the vehicle. It is possible to avoid the detection of the remaining fuel level based on the fuel level in the state where the fuel level in the fuel tank is fluctuating. Therefore, it is possible to detect the indicated value of the remaining fuel amount in the state where the fuel level in the fuel tank is stable after the ignition switch is turned off. Can be stored in the storage means 8. Further, the indication value of the remaining fuel amount immediately after the ignition switch is turned on is determined based on the indication value of the remaining fuel amount stored in the storage means 8 by the display control means 33-2.
Is displayed on the display means 7, so that an erroneous display of the remaining fuel amount immediately after the ignition switch is turned on can be prevented.

[0011] The present invention has been made to solve the above problems.
As shown in the basic configuration diagram of FIG. 1, in the invention described in the claim, the display control means 33-2 is stored in the storage means 8 immediately after an ignition switch is turned on. When there is no stored remaining fuel indication value, the display means 7 displays the remaining fuel indication value calculated by the calculating means 33-1.

According to the above construction, in addition to the operation of the first aspect of the invention, when the instruction value of the remaining fuel amount is not stored in the storage means 8, the instruction value of the remaining fuel amount calculated by the arithmetic means 33-1 is stored. Since the display is made on the display means 7, when the ignition switch is turned on, even if the instruction value of the remaining fuel amount is not stored in the storage means 8, nothing is displayed on the display means 7.

[0013] Claim 3 has been made to solve the above problem.
According to the present invention, as shown in the basic configuration diagram of FIG. 1, in the fuel remaining amount display device for a vehicle according to claim 1 or 2, a non-horizontal state in which the vehicle is inclined by a predetermined angle or more and a horizontal state other than that. The display control means 33-2 further includes a tilt detecting means 5 for detecting, and when the tilt detecting means 5 detects a non-horizontal state, when the ignition switch is turned off, the display control means 33-2 displays the display on the display means 7. The stored value of the remaining fuel is stored in the storage means 8.

According to the above configuration, in addition to the operation of the first or second aspect of the present invention, the display control means 33-2 turns off the ignition switch when the inclination detecting means 5 detects the non-horizontal state of the vehicle. At this time, since the indication value of the remaining fuel amount displayed on the display means 7 is stored in the storage means 8, the liquid level of the fuel in the combustion tank of the vehicle generated when the vehicle stops on the slope is generated. Can be stored in the storage means 8. Therefore, the accurate indication value of the remaining fuel amount can be promptly displayed on the display means 7 immediately after the ignition switch is turned on, without being affected by the inclination state of the vehicle.

Claim 4 has been made to solve the above-mentioned problem.
As shown in the basic configuration diagram of FIG. 1, the invention described in the vehicle fuel remaining amount display device according to claim 1, wherein the instruction value stored in the storage means 8 and the calculation value are calculated. A replenishment detecting means for detecting a difference between the instruction value calculated by the means and a replenishment when the difference is equal to or greater than a predetermined value; -2 is characterized in that when the ignition switch is turned on, when the replenishment detecting means 33-3 detects the presence of replenishment, an indication value of the remaining fuel amount is displayed on the display means.

With the above structure, in addition to the operation of the invention according to any one of the first to third aspects, immediately after the ignition switch is turned on, the display control means 33-2 performs the calculation with the instruction value stored in the storage means 8 and the calculation. When the difference from the indicated value calculated by the means 33-1 is obtained, and the difference is equal to or more than a predetermined value, the replenishment detecting means 33-3 for detecting the presence or absence of refueling detects that refueling has occurred. Since the indication of the remaining fuel level is displayed on the display means 7, even if the fuel is supplied while the ignition switch is turned off, the fuel remaining amount that is accurately increased by refueling immediately after the ignition switch is turned on. An indication of the quantity can be displayed on the display means 7.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a circuit diagram showing one embodiment of the fuel level display device for a vehicle according to the present invention. In FIG. 1, a sensor 1 that detects a liquid level of fuel in a combustion tank of a vehicle and generates an analog fuel signal constitutes a fuel sensor. The sensor 1 has a contact 1b that slides on a resistor 1a in accordance with the position of a float (not shown) floating on the fuel level. One end of the resistor 1a is connected to a _Vcc power supply via a resistor 2 and the other end. Are connected to the ground. The contact 1b slides on the resistor 1a according to the level of the fuel in the combustion tank of the vehicle, and outputs a voltage obtained by dividing the voltage applied to both ends of the resistor 1a as an analog fuel signal. It is applied to the input port I ₁ of the microcomputer (μCOM) 3 via the signal line L1 to.

The μCOM 3 is an analog / digital (A / D) converter 31 for converting the analog fuel signal input to the input port I ₁ into a digital signal to obtain a digital fuel signal.
And a read-only memory (ROM) 32 storing programs and fixed data, and a central processing unit (CP) for executing processing in accordance with the programs stored in the ROM 32.
U) 33, and a readable and writable memory (RAM) 34 having a data area for storing various data generated during the processing of the CPU 33 and a work area used for the processing. μCOM3 also has a power port V _CC , a ground port GND, input ports I _{2 to} I ₄ , output ports O ₁ and O _2, and an input / output port IO in addition to the input port I ₁ .

A connection point between one end of the resistor 1a and the resistor 2 is connected to a power supply port V _{CC of the} μCOM 3 via a power supply line L2, and the operating power supply voltage V _CC is supplied. μC
The other end of the grounded resistor 1a is connected to the ground port GND of the OM3 via a ground line L3. A speed pulse having a cycle corresponding to the vehicle speed generated by a vehicle speed sensor (not shown) connected to the input terminal 41 according to the traveling of the vehicle is input to the input port I _{2 of the} μCOM 3. The input port I _3, tachometer pulses of a period rotation sensor (not shown) connected to the input terminal 42 according to the engine rotational speed which occurs in response to ON of the engine is input. The input port I _4, provided in a vehicle, when the vehicle is tilted a predetermined angle or more, depending on which was turned on and off when there is no more than a predetermined value of the slope, it a non-horizontal state of the vehicle is inclined more than a predetermined angle An inclination sensor switch 5 is connected as inclination detecting means for detecting a horizontal state other than the above.

A cross coil driver 6 is connected to the output port O _{1 of the} μCOM 3. μCOM3 CPU
Reference numeral 33 outputs a deflection angle value to the cross coil driver 6. The cross-coil driver 6 supplies a pulse-shaped drive current according to the swing angle of the pointer to the cross coil 7 including a pair of coils 71 and 72 that are wound crossing each other and that is included in the cross-coil instrument. The cross-coil meter functions as a display unit as a fuel gauge for indicating the swing angle value to the pointer and displaying the indicated value.

More specifically, a pulse-like drive current whose duty ratio and current direction change sinusoidally according to the pointer swing angle value is applied to one coil 71 of the cross coil 7, and the cosine is applied to the other coil 72. The pulse-shaped drive currents which change in a continuous manner are respectively supplied, and both coils 71 and 72 generate magnetic fields orthogonal to each other. As a result, the cross coil 7 has a combined magnetic field direction of 36 degrees according to the pointer swing angle value.
A combined magnetic field that rotates 0 degrees is generated. The cross coil 7 formed by crossing and winding a pair of coils 71 and 72 has a space formed therein. In this space, N
A rotor magnet (not shown) in which the S pole is radially magnetized is rotatably arranged, and its NS pole is rotated so as to match the direction of the composite magnetic field. By rotating the pointer according to the rotation of this rotor magnet,
The remaining fuel amount can be displayed by the indicated value of the pointer.

A non-volatile memory (NVM) 8 is connected to the input / output port IO of the μCOM 3 as storage means capable of holding data without a backup power supply.
CPU 33 reads various types of constant data rewritably stored in a predetermined area of the NVM 8,
The data generated in the course of the processing is written in a predetermined area and read out as necessary. Incidentally, 9 is the remaining amount c awning indicator warning by lighting that the fuel remaining amount is low below a predetermined amount, and is connected to the output port O _2.

FIG. 3 is a diagram showing various areas in the RAM included in the μCOM in FIG. This RAM 34
Are a sampling data storage area 341 in which data sampled by the calculating means is stored, and a first target value storage area 342 in which the deflection angle of the pointer obtained based on the analog fuel signal from the fuel sensor is stored. A current swing angle value storage area 343 in which a target value at the time of fuel display is stored, a second target value storage area 344 in which the latest target value is stored every time the vehicle stops for a certain period of time,
A third target value storage area 345 for storing a target value when the vehicle is stopped when the vehicle is not horizontal, and a fourth target value storage area 346 for storing an instruction value when the vehicle is running when the vehicle is not horizontal. And a flag area 347 in which flag information of FT1 to FT6 is set, and a timer area 344 in which a timer value is set. FIG. 4 is a diagram showing various areas in the nonvolatile memory (NVM) in FIG. The NVM 8 has a target value storage area 81 for storing an instruction value of the remaining fuel amount when the IGN switch is turned off, and a constant storage area 82 for storing various constants.

In the above configuration, the CPU of the μCOM3
33 reads the state of the power supply port V _CC and the states of the input ports I _{1 to} I ₄ according to the program stored in the ROM 32 and performs predetermined processing.
Reads and writes data via the input-output ports IO outputs a ₁ and O ₂ to the data.

More specifically, the CPU 33 of the μCOM 3
Power port V_CCV applied to _CCMonitor and stand
Ignition (IGN) switch by rising
Turns on, and turns off by falling.
Judge each. The CPU 33 of the μCOM 3
I₁The analog fuel signal input to the
For example, the A / D converter 3 has a sampling period of 100 ms.
A / D converted to 1 to obtain a digital fuel signal,
ms × 16 = every 1.6 seconds, this digital fuel signal
6 samples are collected and averaged, and this value is used as an indicator.
Is calculated. The calculated swing angle value of the pointer
Eight pieces were collected, and the collected eight swing angle values were weighted averaged.
To calculate the target value of the deflection angle of the pointer. That is, μC
The CPU 33 of the OM 3 reads the analog fuel from the fuel sensor 1.
Calculate the digital fuel level indication by inputting the fuel signal
Working as arithmetic means. Weighted average for this target value
The value is determined by the following weighted average formula.

Σold (i) = Σold (i−1) −Σold (i−1) / N + NEW Deflection angle = Σold (i) / N (N = 8) Then, the target value is obtained by comparing the hands from the current position. It is a deflection angle value of a final position to be driven and moved sequentially by a constant angle every second constant time which is relatively long.

The CPU 33 of the μCOM 3 has an input port I
The cycle of the speed pulse input to ₂ is measured, and if there is no input of the speed pulse even after a predetermined time has elapsed, it is determined that the vehicle speed is 0, that is, the vehicle is stopped. μC
The CPU 33 of the OM ₃ determines that the engine is on based on the presence of the tacho pulse input to the input port I ₃ . Further, the CPU 33 of the μCOM 3 determines that the vehicle is tilted by a predetermined angle or more and is in a non-horizontal state when the tilt sensor switch 5 serving as the tilt detecting means connected to the input port I ₄ is on, When the vehicle is off, it is determined that the vehicle is not inclined at a predetermined angle or more and is in a horizontal state.

According to the result of the input processing as described above, μC
The CPU 33 of the OM 3 performs the following arithmetic processing, output processing, and input / output processing.

The CPU 33 of the μCOM 3 is connected to the power port V _CC
Is constantly monitored, and when the IGN switch is turned off and the power supply port V _CC is in the L level state, the apparatus enters the power saving mode standby state. When the IGN switch is turned on during this standby state and the input port V _CC goes to the H level state, it is determined that the IGN switch has been turned on, and the following initial output processing is performed.

In this initial output process, first, a digital fuel signal is obtained at a Bms (millisecond) cycle of, for example, 100 ms, and is stored in the sampling data storage area 341 in the RAM 34. For example, four digital fuel signals are obtained. By the way, the deflection angle value is obtained from the simple average value. The value of the constant B is stored in the constant storage area 82 in the NVM 8. Next, it is determined by the state of the tilt sensor switch 5 connected to the input port I _4, the vehicle is non-horizontal state, which one of the horizontal state.

In the horizontal state, the swing angle value obtained by the above simple average value is stored in the first target value storage area 342 in the RAM 34 and in the current swing angle value storage area 343 to be transmitted to the cross coil driver 6. Is output to the instrument, and the deflection angle value is displayed on the pointer of the instrument. That is, the CPU 33 of the μCOM 3 functions as a display control unit that drives a cross-coil meter as a display unit and controls the meter to display the remaining fuel amount.

In the non-horizontal state, first, the last IGN
When the switch is turned off, it is determined whether or not there is target value data stored in the target value storage area 81 in the NVM 8, and if so, the swing angle value obtained this time as described above and stored in the target value storage area 81. The difference from the set target value is determined, and it is determined whether the difference is equal to or greater than a predetermined value A. The value of the constant A is stored in the constant storage area 82 in the NVM 8. This determination is based on the last IGN
This is for judging whether or not there is refueling between the time when the switch is turned off and the time when the IGN switch is turned on this time, and the remaining fuel amount has changed greatly. That is,
The CPU 33 of the μCOM 3 functions as replenishment detection means for detecting the presence or absence of refueling.

When the difference is equal to or larger than A, that is, when fuel is supplied, the swing angle value of the replenished fuel remaining amount is stored in the first target value storage area 342 and the current swing angle value storage area 343 in the RAM 34. And outputs it to the cross coil driver 6. If the difference is less than A, that is, if there is no refueling, the target value stored in the target value storage area 81 in the NVM 8 is displayed in order to display the position of the pointer immediately before the last IGN switch off. RAM
The data is stored in the first target value storage area 342 in the memory 34 and the current swing angle value storage area 343 and output to the cross coil driver 6.

If there is no data when the IGN switch was turned off last time, the swing angle value obtained by the above simple average value is stored in the first target value storage area 3 in the RAM 34.
42 and the current swing angle value storage area 343
And outputs it to the cross coil driver 6.

In any of the above cases, it is determined whether or not the pointer position based on the swing angle value stored in the current swing angle value storage area 343 in the RAM 34 is equal to or smaller than a constant D. In this case, the remaining amount warning indicator 9 is turned on, and when the pointer position is less than D, it is turned off. The value of the constant D is stored in the constant storage area 82 in the NVM 8. Thus, the output processing of the initial value is completed.
When the GN switch is turned off, the process returns to the standby state during the process.

When the initial value output processing is completed as described above, the following processing is performed until the IGN switch is turned off or the engine is turned on. In the following processing, until the vehicle runs. The following processing is always performed.

That is, the CPU 33 of the μCOM 3 measures the cycle of the speed pulse input to the input port I ₂ , determines that there is no input of the speed pulse even after the lapse of a predetermined time, and determines that the vehicle speed is 0 km / h. If it lasts for P seconds, the swing angle value of the target value stored in the first target value storage area 342 in the RAM 34 at that time is stored in the second target value storage area as temporary storage means. In advance,
Thereafter, when the difference between the target value stored in the second target value storage area and the swing angle value of the target value obtained at regular time intervals Q is continuously equal to or larger than the R time constant A set in the NVM, It enters the high-speed response mode, and enters the normal mode when it is smaller than the constant A. The high-speed response mode is provided in consideration of processing at the time of refueling.

The above-mentioned target value is obtained in a sampling cycle, and is stored in a sampling data storage area 34 in the RAM 34.
When the number of digital fuel signals stored in 1 becomes 16, these are averaged and obtained at regular time intervals Q. Therefore, the value of the constant Q is a time corresponding to, for example, 100 ms (sampling cycle) × 16 times (average number), and is stored in the constant storage area 82 in the NVM 8.

When the vehicle is in the horizontal state, in the case of the normal mode, the swing angle value obtained by averaging the 16 digital fuel signals at regular time intervals Q as described above is set as the target value, and this target value is set as the target value. 1 is stored in the target value storage area 342, the target value is weighted and averaged, and the deflection angle data stored in the current deflection angle value storage area 343 in the RAM 34 toward the target value is stored every N seconds. Is changed by one bit at a time, and the angle corresponding to one bit is changed every N seconds which is the second fixed time from the current shake angle value. On the other hand, in the case of the high-speed response mode, the swing angle is weighted one bit at a time in Mms, which is a first fixed time relatively shorter than the first fixed time, toward the weighted swing angle value as described above. The constants N and M are stored in a constant storage area 82 in the NVM 8.

When the vehicle is in a non-horizontal state, in the normal mode, in the initial value output process, the swing angle value stored in the current swing angle value storage area 343 in the RAM 34 is continuously output to the cross coil driver 6. Do not move the pointer. On the other hand, in the case of the fast response mode, the NVM
8 is added to the swing angle value of the target value stored in the target value storage area 81 in the RAM 8 and the swing angle value obtained this time as described above.
4 is stored in the first target value storage area 342 in the RAM 34 as a new target value deflection angle value obtained by adding the difference from the deflection angle value stored in the second target value storage area 344 in the RAM 34. Then, the swing angle value data stored in the current swing angle value storage area 343 in the RAM 34 is changed by one bit for each Mms toward the target value, and the data is changed from the current shake angle value to one bit for each Mms. Move the pointer by the corresponding angle.

In any of the above cases, the determination is made based on the swing angle value stored in the current swing angle storage area 343 in the RAM 34, and when it is equal to or smaller than the constant D, the remaining amount warning indicator 9 is turned on. Whether the position of the pointer is larger than D for 40 seconds or more is determined by the current swing angle value storage area 343 in the RAM 34.
And the remaining amount warning indicator 9 is turned off. This 40-second timer is a cumulative timer, which is not cleared even if the vehicle state changes between the horizontal state and the non-horizontal state, but is cleared when the pointer position moves over a constant D, and is continuously cleared. Then 40
During the second, the remaining amount warning indicator 9, which is lit only when it is in the same state, is turned off.

When the IGN switch is turned off in the course of the above processing, the process returns to the standby state in the middle of the processing, and when the engine is turned on, the idling display processing is performed. When the engine is turned on and off while the vehicle is running, the process directly proceeds to the running display process without going through the idling display process.

In the idling display process, when the vehicle is in the horizontal state, in the normal mode, the weighted average swing angle value is set as the target value in the same manner as described above.
The pointer is moved one bit at a time every N seconds toward the target value. Also in the case of the high-speed response mode, in the same manner as described above, a swing is performed one bit at a time every Mms toward the swing angle value of the weighted average target value.

When the vehicle is in the non-horizontal state, in the normal mode, for example, assuming that 2 liters (l) of fuel is consumed per hour, the current swing angle is subtracted at a rate of 2 liters (l) / h. I do. That is, the CPU 33 of the μCOM 3 performs the operation from the time when the engine is turned on to the time when the vehicle starts running.
When a non-horizontal state is detected, it is determined that there is a predetermined fuel consumption per unit time, and a predetermined value is sequentially subtracted from a current specified value at a predetermined time to calculate a fuel remaining value.
In this subtraction processing, 2 liters / h is calculated from the current swing angle value.
A corresponding swing angle is subtracted, a weighted average of the values is obtained to obtain a target value, and the target value is stored in a third target value storage area 345 in the RAM 34 at regular time intervals Q. Move the pointer one bit at a time every second.

In the case of the high-speed response mode, in the same manner as described above, the swing angle value of the target value stored in the target value storage area 81 in the NVM 8 and the swing angle value obtained this time and the storage of the second target value are stored. A value obtained by adding the difference from the swing angle value stored in the area 344 is stored in the first target value storage area 342 as a swing angle value of a new target value, and the current swing angle value storage area is moved toward this target value. The swing angle value data stored in 343 is changed by one bit every Mms, and the pointer is swung by an angle corresponding to one bit every Mms from the current shake angle value.

In any of the above cases, it is determined whether the value is equal to or less than the constant D or the position of the pointer is greater than D for 40 seconds or more. In the former case, the remaining amount warning indicator 9 (not shown) is turned on. In the latter case, the light is turned off. When the IGN switch is turned off during the idling display process, the process returns to the standby state in the middle of the process, and when the vehicle speed exceeds 0 km / h, the process proceeds to the traveling display process.

In the traveling display process, when the vehicle is in a horizontal state, the vehicle is swung by one bit every N seconds toward the swing angle value of the weighted average target value as described above. Assuming that 1 liter (l) of fuel is consumed per 6 km when the vehicle is in a non-horizontal state, the fuel consumption is subtracted at a rate of 6 km / liter (l) every time corresponding to the sampling period. That is, the CP of μCOM3
U33 determines that the vehicle travels a predetermined distance per unit amount when a non-horizontal state is detected while the vehicle is running, and sequentially subtracts a predetermined value corresponding to the traveling distance from a current instruction value at predetermined time intervals to determine a remaining fuel amount. Calculating the indicated value of the quantity. In this subtraction processing, a value obtained by subtracting the value obtained by subtracting from the current shake angle value is obtained as a weighted average, and a target value is obtained. The target value is stored in the fourth target value storage area 346 in the RAM 34 at regular time intervals Q. The pointer is moved one bit at a time every Mms.

In any of the above cases, it is determined whether the pointer is below the constant D or the position of the pointer is larger than the constant D for 40 seconds or more. In the former case, the remaining amount warning indicator 9 is turned on. In the latter case, the light is turned off. In the course of this traveling display processing, if the IGN switch is turned off, the processing returns to the standby state in the middle of the processing. If the vehicle speed becomes 0 km / h, the processing returns to the idling display processing. Return to the process immediately after the value output process.

The details of the operation outlined above are described in μCOM3
This will be described in detail below with reference to flowcharts of FIGS. FIG. 5 is a flowchart showing a part of the processing performed by the μCOM of the arithmetic control unit in FIG. 2, and FIG. 6 is a flowchart showing another part of the processing performed by the μCOM of the arithmetic control unit in FIG. 7 is FIG.
9 is a flowchart showing still another part of the processing performed by the μCOM of the arithmetic control unit in FIG. 9, and FIG. 8 is a flowchart showing another part of the processing performed by the μCOM of the arithmetic control unit in FIG. 10 is a flowchart showing the contents of the remaining amount-shake angle conversion process in FIG. 6, FIG. 10 is a flowchart showing the contents of the mode setting process in FIG. 6, and FIG. 11 is a shake angle output process A in FIG. 12 is a flowchart showing the contents of the swing angle output process B in FIG. 6, FIG. 13 is a flowchart showing the contents of the shake angle output process C in FIG. 6, and FIG. Figure 7
15 is a flowchart showing the contents of the swing angle output processing D in FIG. 15, FIG. 15 is a flowchart showing the contents of the shake angle output processing E in FIG. 8, and FIG. 16 shows the contents of the CPU shift standby processing in FIG. It is a flowchart.

As shown in FIG. 5, the CPU 33 of the μCOM 3 starts operating when the power is turned on, and is in a standby state in which the IGN switch is turned on in step S1 until the IGN switch is turned on. When the IGN switch is turned on and the determination in step S1 is YES, the process proceeds to step S2 and waits for the elapse of the sampling time Bms. When the sampling time has elapsed and the determination in step S2 is YES, the process proceeds to step S3, where the input port I
A / D conversion is performed on the analog fuel signal 1 to obtain digital fuel data, which is stored in a sampling data storage area 341 formed in the RAM 34. Thereafter, the process proceeds to step S4, where it is determined whether or not digital fuel data is stored in the four data areas.
Steps S2 to S4 are repeated until.

When the determination in step S4 is YES, the process proceeds to step S5, where the simple average value of the fuel data read in step S3 and stored in the four fuel data areas of the RAM 34 is obtained, and then the process proceeds to step S6. In step S6, a swing angle value is calculated based on the simple average value obtained in step S5, and the swing angle value is stored in the first target value storage area 342 in the RAM 34 as a target value. By the processes of steps S2 to S6, immediately after the ignition switch is turned on, the CPU 33 functions as a calculation unit that inputs the fuel signal from the fuel sensor 1 and calculates the indicated value of the remaining fuel amount.

Following the calculation and storage in step S6, the process proceeds to step S7, where it is determined whether or not there is a target value stored in the target value storage area 81 in the NVM 8 where the target value was previously stored when the IGN switch was turned off. When there is no data and the determination in step S7 is NO, the process proceeds to step S8. In step S6, the swing angle value stored in the first target value storage area 342 is replaced with the current swing angle value storage area. 343, and outputs this to the cross coil driver 6, and then proceeds to step S9.
By the processing in step S8, the CPU 33 functions as a display control unit that controls the cross-coil meter as a display unit to display the fuel remaining amount on the meter, and calculates the indicated value immediately after the ignition switch is turned on. The remaining fuel amount is displayed based on.

As described above, when the target value stored in the target value storage area 81 in the NVM 8 is not stored, the remaining fuel amount is displayed based on the calculated instruction value. When is turned on, even if the target value of the remaining fuel amount is not stored in the target value storage area 81 in the NVM 8, nothing is displayed.

On the other hand, if the determination in step 7 is YES, the process proceeds to step S9. In step S9, the swing angle value calculated in step S6 and stored in the first target value storage area 342 in the RAM 34 this time,
The difference from the target value stored in the target value storage area 81 in the NVM 8 when the IGN switch was turned off last time is calculated,
In the next step S10, it is determined whether or not this difference is equal to or greater than a constant A. By the process in step S10, immediately after the ignition switch is turned on, the CPU 33 obtains a difference between the instruction value stored in the target value storage area 81 in the NVM 8 and the instruction value calculated this time, and determines the difference as a predetermined predetermined value. The presence of fuel supply is detected by the presence of the value A or more.

When the determination in step S10 is YES, that is, when the difference between the swing angle value when the IGN switch is turned off and the shake angle value obtained this time becomes larger than the constant A due to refueling, the process proceeds to step S11. Here, the swing angle value stored in the first target value storage area 342 in the above step S6 is changed to the current swing angle value storage area 343.
And outputs this to the cross coil driver 6 before proceeding to step S13. Therefore, even if the fuel is supplied while the ignition switch is off, the indication value of the remaining fuel amount that has been accurately increased by refueling immediately after the ignition switch is turned on is displayed on the display means.

On the other hand, when the determination in step S10 is NO, that is, when the difference obtained in step S9 is a constant A
If it is less than NVM8, the process proceeds to step S12.
The target value of the swing angle value of the pointer after the last time the IGN switch was turned off, stored in the target value storage area 81 in the RAM 3 is stored in the RAM 3.
4 is stored in the first target value storage area 342 and the current deflection angle value storage area 343, and is output to the cross coil driver 6, and then the process proceeds to step S13. Therefore, an accurate indication of the remaining fuel amount is displayed on the display means immediately after the ignition switch is turned on.

Next, in step S13, it is determined whether or not the position of the pointer, that is, the swing angle value stored in the current swing angle storage area 343 in the RAM 34 is greater than or equal to the constant D. In the case of, the process proceeds to step S15, and the remaining amount warning indicator 9 is turned on. If the determination in step S9 is YES, that is, if the position of the pointer is larger than the constant D, the process proceeds to step S11 to turn off the remaining amount warning indicator 9, and the IGN
The initial value output processing when the switch is turned on ends, and the process proceeds to the next processing.

After the end of the above-described initial value output processing, the remaining amount-deflection angle conversion processing in step ST0 (FIG. 6) and the mode setting processing in step ST1 (FIG. 6) are performed, and step S2 is performed.
Then, the state of the tilt sensor switch 5 connected to the input port I4 is read, and it is determined whether the vehicle is in a horizontal state based on the read state of the tilt sensor switch 5. When the determination in step S20 is YES, that is, when the vehicle is in the horizontal state, NO is determined in step S21.
In the case of, that is, in the non-horizontal state, the process proceeds to step S22 to determine whether or not the processing mode is the normal mode.

In steps S21 and S22,
Unless the high-speed response mode is set under the following conditions, the normal mode is set and the determination is YES. That is, vehicle speed 0k
m / h, that is, each time the vehicle stops for P seconds, the target value at that time is stored in another target value storage area in the RAM 34, and thereafter, the stored value and the fixed time Q (1
If the difference from the target value obtained every (00 ms sampling time × 16) continuously exceeds R times A or more, the high-speed response mode is entered, and if the difference is smaller than A, the normal mode is entered. In the high-speed mode, a speed pulse is input or IGN
Continue until the switch is turned off.

For this purpose, the CPU 33 performs the processing shown in the flowchart of FIG. 9 for each sampling period in the remaining amount-deflection angle conversion processing ST0, and A / D converts the analog fuel signal in the first step ST1. To obtain digital fuel data, calculate a deflection angle value based on the digital fuel data, and calculate the calculated deflection angle value as R
The data is sequentially stored in the sampling data storage area 341 in the AM 34. Thereafter, the process proceeds to step ST2, where it is determined whether or not 16 pieces of data are stored in the sampling data storage area 341. If this determination is NO, the process returns to the original process, and if the determination is YES, the process returns to step ST3.
, Averaging 16 data, calculating the target value,
This value is multiplied by a weighted average in step ST4, and stored in the first target value storage area 342 in the RAM 34, before returning to the original processing. By the above processing, CPU
Reference numeral 33 functions as a calculating means for calculating a command value for inputting a fuel signal from the fuel sensor 1 and indicating a remaining fuel amount.

The CPU 33 executes the mode setting process S
P sec timer is reset by the speed pulse input to the input port I ₂ at T1 performs the processing as shown in the flowchart of FIG. 10 for each counting a predetermined time of P seconds, RAM in the first step ST01
The target value stored in the first target value storage area 342 in the RAM 34 is stored in the second target value storage area 344 in the RAM 34.
It is determined whether or not it has been stored. When this determination is NO, in the next step ST10, the target value stored in the first target value storage area 342 in the RAM 34 is set to R
The process proceeds to step ST11 after being stored in the second target value storage area 344 in the AM 34. If the determination in step ST01 is YES, the process skips step ST10 and proceeds to step ST11.

In step ST11, the difference Y between the target value stored in the second target value storage area 344 and the target value in the first target value storage area 342, that is, the target value obtained at regular time intervals Q, is calculated. Take. Thereafter, the process proceeds to step ST12, where it is determined whether or not the difference is equal to or greater than A.
In the case of ES, the process proceeds to step ST13 to increment the counter, and then proceeds to step ST14 to determine whether or not the counter value is 2 or more.
In the case of, the process proceeds to step ST15 to set the high-speed response mode and returns to the original processing. If the determination in step ST12 is NO, that is, if the difference is not greater than A, the process proceeds to step ST16 to clear the counter,
In the next step ST17, the normal mode is set and the process returns to the original processing. Through the above processing, the CPU 33 calculates the difference between the calculated instruction values before and after the ignition switch is turned on until the start of driving, and detects the presence of refueling when the difference is equal to or greater than the predetermined value A. are doing.

The determination in step S21 (FIG. 6) is YE
In the normal mode in S, the process proceeds to a swing angle output process A (FIG. 11) in a process routine executed at regular intervals,
In the first step S23, the first
It is determined whether or not the target value of the target value storage area 342 is equal to the current swing angle value storage area 343.
If O, the process proceeds to step S24 to determine whether or not the timer flag FT1 in the flag area 347 in the RAM 34 is on. If this determination is NO, the process proceeds to step S24.
Proceeding to step 25, the N-second timer in the timer area 348 in the RAM 34 is started and the timer flag FT1 is turned on. Thereafter, the process proceeds to step S26 to determine whether or not N seconds have elapsed. If the determination in step S26 is YES, the process proceeds to step S27, where the data of the swing angle value in the current swing angle value storage area 343 in the RAM 34 is stored. For example, the value is incremented or decremented by a predetermined angle value corresponding to one bit and output to the cross coil driver 6 and the timer flag FT1 is turned off.

As described above, the swing angle value data in the current swing angle value storage area 343 in the RAM 34 is changed one bit at a time every second N seconds and directed toward the target value stored in the target value storage area 342. Thus, the pointer can be swung by a unit angle every N seconds for a predetermined time. In other words, the responsiveness of the display performed using the indicated value calculated when there is no refueling as the target value is slower than at the time of refueling. The influence of the fluctuation can be reduced.

When the determination in step S23 is YES, the swing angle output processing A is terminated without any operation. Also,
If the determination in step S24 is YES, step 25
Is skipped and the process proceeds to step S26.
Is NO, the process skips step S27 and proceeds to step S28.

When the determination in step S21 is NO and the high-speed response mode is set, the process proceeds to a swing angle output process B (FIG. 12) in a process routine executed at regular time intervals. It is determined whether the target value of the first target value storage area 342 is equal to the current swing angle value storage area 343. If the determination is NO, the process proceeds to step S30 to determine whether the timer flag FT2 in the RAM 34 is on. If the determination is NO, the process proceeds to step S31 to start the Mms timer in the RAM 34 and to set the timer flag FT
Set 2 Then, the process proceeds to step S32, where Mms
It is determined whether or not the time has elapsed. If the determination in step S32 is YES, the process proceeds to step S33, where the RAM
The data of the swing angle value in the current swing angle value storage area 343 in the memory 34 is incremented or decremented by, for example, a predetermined angle value corresponding to 1 bit, and the cross coil driver 6
And turns off the timer flag FT2, and then proceeds to step S28. As described above, the RAM 34
The data of the swing angle value in the current swing angle value storage area 343 is changed by one bit every Mms, and the data is shifted toward the target value stored in the target value storage area 342 by a first fixed time M.
The pointer can be swung by a unit angle every ms. That is, when replenishing fuel on a flat ground, an instruction value calculated based on the liquid level that changes every moment can be promptly displayed.

If the determination in step S29 is YES, the swing angle output processing B ends without performing any operation. Also,
If the determination in step S30 is YES, step 31
Is skipped, and the process proceeds to step S32. If the determination in step S32 is NO, step S33 is skipped and the swing angle output process B ends.

On the other hand, the determination in step S22 is YES
In the normal mode, the process immediately goes to step S2 without doing anything.
Proceed to 8. As a result, the deflection angle value output to the cross coil driver 6 in the initial output processing is maintained.

On the other hand, if the determination in step S22 is NO and the high-speed response mode is set, the process proceeds to step S34, where the first target value storage area 342 of the RAM 34 is set.
The difference between the deflection angle value obtained this time and the deflection angle value obtained this time, that is, a value obtained by adding a change in the target value, is set as a new target value in the first target value storage area 34 in the RAM 34.
2 is stored.

Thereafter, the process proceeds to a shake angle output process C (FIG. 13) in a process routine executed at regular intervals, and in the first step S35, the target value of the first target value storage area 342 in the RAM 34 and the current shake are output. Angle value storage area 3
43 is determined to be equal. If the determination is NO, the process proceeds to step S36 to determine whether or not the timer flag FT3 in the RAM 34 is turned on.
If it is O, the process proceeds to step S37, and M
Starts the ms timer and sets the timer flag FT3
Is set. Thereafter, the process proceeds to step S38 to determine whether or not Mms has elapsed.
In the case of ES, the process proceeds to step S39, where the RAM 3
4 is output to the cross coil driver 6 by incrementing or decrementing the swing angle value data in the current swing angle value storage area 343 by, for example, a predetermined angle value corresponding to 1 bit, and turning off the timer flag FT3. Then, the process proceeds to step S28.

As described above, the swing angle value data in the current swing angle value storage area 343 in the RAM 34 is changed by one bit every Mms, and the data is shifted toward the target value stored in the target value storage area 342 in the above step S34. The pointer can be swung by a unit angle every one fixed time Mms. That is, even if the fuel is supplied on the sloped land between the time when the ignition switch is turned on and the start of driving, the indicated value of the remaining fuel amount that quickly cancels the change in the liquid level of the fuel in the combustion tank of the vehicle that has occurred on the sloped land is quickly changed. Can be displayed.

When the determination in step S35 is YES, the swing angle output processing C is terminated without any operation. Also,
If the determination in step S36 is YES, the process skips step 37 and proceeds to step S38. If the determination in step S38 is NO, step S39 is skipped and the swing angle output process C ends.

In step S 28, the position of the pointer, that is, the current swing angle storage area 3 in the RAM 34
It is determined whether or not the swing angle value stored in 43 is equal to or greater than a constant D. If the determination in step S28 is NO, the process proceeds to step S40 to determine whether the timer flag FT4 is on. If the determination is NO, the process proceeds to step S41, in which a timer for a predetermined time, for example, 40 seconds, is started, and the timer flag FT4 is turned on. In subsequent step S42, it is determined whether or not the timer started in step S41 has timed out. Is determined. When the determination in step S42 is YES, that is,
The swing angle value stored in the current swing angle storage area continues to be 4
If it is 0 seconds or more and the constant D or more, the process proceeds to step S43 to light the remaining amount warning indicator, and then proceeds to step S44. The determination in step S40 is YE
S, that is, if the timer flag FT4 is off, skip step S41 and proceed to step S42. If the determination in step S42 is NO, that is, if 40 seconds have not elapsed, skip step S43 and proceed to step S44. .

On the other hand, the determination in step S28 is YES
In other words, when the swing angle value stored in the current swing angle storage area 343 in the RAM 34 is not equal to or greater than the constant D, the process proceeds to step S45 to turn off the timer flag FT4, and turns off the remaining amount warning indicator in step S46. Before proceeding to step S44. In step S44, it is determined whether or not the IGN switch is off. If the determination is YES, the process returns to step S1 via the CPU shift standby process in step SF0. The details of the CPU transition standby process will be described later.

If the determination in step S44 is NO, the process proceeds to step S47 to determine whether or not the engine is on. If the determination is NO, the process returns to step S20 to repeat the above-described operation. On the other hand, if the determination in step S47 is YES, the process proceeds to step S47.
Proceeding to 48, it is determined whether the vehicle is running. When the determination in step S48 is NO, the process proceeds to an idling display process described later, and when the determination is YES, the process proceeds to a travel display process described later with reference to FIG. In any case, the processing of steps S20 to S48 is continuously performed until the engine is turned on or the IGN switch is turned off.

In the idling display process (FIG. 7), in the first step S50, the input port I
The state of the tilt sensor switch 5 connected to 4 is read, and it is determined whether or not the vehicle is in a horizontal state based on the read state of the tilt sensor switch 5. Step S
When the determination in Step 50 is YES, that is, when it is in the horizontal state, the process proceeds to Step S51, and when the determination is NO, that is, when it is in the non-horizontal state, the process proceeds to Step S52 to determine whether the processing mode is the normal mode.

If the determination in step S51 is YES and the mode is the normal mode, the flow advances to step S53 to perform the same processing as steps S23 to S27 described above with reference to FIG. 11, that is, the swing angle output processing A, and then to step S54. As described above, in the engine-on state, the indicated value calculated based on the liquid level that changes every moment on a flat ground is displayed. In addition, the responsiveness of the display performed using the indicated value calculated when there is no refueling as the target value becomes slow, and when the liquid level fluctuates even when there is no refueling on a flat ground, the indicated value is affected by this fluctuation. Receive less.

On the other hand, if the determination in step S51 is NO and the high-speed response mode is set, the flow advances to step S55 to perform the same processing as steps S29 to S33 described above with reference to FIG. Proceed to step S54. That is, even if refueling is performed on the sloped land between the time the ignition switch is turned on and the start of traveling, the indicated value of the remaining fuel level is displayed, which cancels the change in the liquid level of the fuel in the combustion tank of the vehicle that occurred on the sloped land. In addition, the responsiveness of this display is faster than the display performed using the indicated value calculated when there is no refueling as the target value, and the indicated value reflecting the increase in the liquid level due to refueling is displayed quickly.

On the other hand, the determination in step S52 is YES
In the normal mode, the process proceeds to step S56, in which 2 times per hour corresponding to the sampling period.
16 data obtained by subtracting from the current fuel remaining amount (the target value of the swing angle value) at the rate of liter (l) are obtained by calculation,
A weighted average is calculated based on the 16 data to calculate a target value. By this processing, the CPU 33 determines that there is a predetermined fuel consumption per unit time and sequentially determines a predetermined value from the current instruction value at a predetermined time interval when detecting a non-horizontal state from the time the engine is turned on until the start of driving. The instruction value of the remaining fuel amount is calculated by subtraction.

Thereafter, the flow advances to step S57 to store the target value in the third target value storage area 345. Thereafter, the process proceeds to a shake angle output process D (FIG. 14) in a process routine executed at regular intervals. In the first step S58, the target value and the current shake angle value in the third target value storage area 345 in the RAM 34 are stored. It is determined whether or not the area 343 is equal. If the determination is NO, the process proceeds to step S59, and it is determined whether or not the timer flag FT5 in the RAM 34 is turned on. If the determination is NO, the process proceeds to step S60. To start the N second timer in the RAM 34 and set the timer flag FT5. Thereafter, the process proceeds to step S61 to determine whether N seconds have elapsed. If the determination in step S61 is YES, the process proceeds to step S61.
In step 62, the swing angle value data in the current swing angle value storage area 343 in the RAM 34 is incremented or decremented by a predetermined angle value corresponding to, for example, 1 bit, and output to the cross coil driver 6 and a timer. The flag FT5 is turned off.

As described above, the swing angle value data in the current swing angle value storage area 343 in the RAM 34 is changed one bit at a time every N seconds toward the target value stored in the target value storage area 342 in step S57. The pointer can be swung by a unit angle every N seconds for a fixed time. That is, even if the liquid level of the fuel in the combustion tank of the vehicle changes on a slope when the vehicle is stopped, this is not detected and the display based on the fuel signal generated by the fuel sensor 1 is not performed.
Moreover, the decrease in the remaining fuel amount consumed by turning on the engine is reflected in the indicated value with a certain degree of accuracy.

When the determination in step S58 is YES, the swing angle output processing D ends without performing any operation. Also,
If the determination in step S59 is YES, step S60 is skipped and the process proceeds to step S61. If the determination in step S61 is NO, step S62 is skipped and the swing angle output process D ends.

On the other hand, if the determination in the step S52 is NO and the high-speed response mode is set, the process proceeds to a step S63, where the steps S34 to S described above with reference to FIG.
After performing the same processing as in step S39, that is, the swing angle output processing C, the process proceeds to step S54. Therefore, even if refueling is performed on a sloped area from the time when the engine is turned on until the start of traveling, an indication value of the remaining fuel amount that cancels out a change in the liquid level of the fuel in the combustion tank of the vehicle that occurred on the sloped area is displayed, The responsiveness of this display is faster than the display performed using the indicated value calculated when there is no refueling as the target value, and the indicated value reflecting the increase in the liquid level due to refueling is displayed immediately. In step S54, the same warning process as steps S28, S40 to S43, S45, and S46 described above with reference to FIG. 6 is performed, and then the process proceeds to step S64.

In the above step S64, it is determined whether or not the IGN switch is off, and this determination is YES.
In the case of, the process returns to the step S1 via the CPU shift standby process in the step SF0. The details of the CPU transition standby process will be described later. Step S64
If the determination is NO, the process proceeds to step S65 to determine whether the engine is off, and if the determination is YES, the process returns to step S20 to repeat the above operation. On the other hand, if the determination in step S65 is YES, the process proceeds to step S66 to determine whether the vehicle speed is not 0 km / h, that is, whether or not the vehicle is running. If the determination in step S66 is NO, the process proceeds to step S5.
After returning to 0, the above-described operation is repeated, and when the determination is YES, the process proceeds to a traveling display process described later with reference to FIG. In any case, the processes in steps S50 to S66 are continuously performed until the vehicle runs, the engine is turned off, or the IGN switch is turned off.

In the traveling display processing (FIG. 8), in the first step S70, it is determined whether or not the vehicle is in a horizontal state based on the state of the inclination sensor switch 5. When the determination in step S70 is YES, that is, when the vehicle is in the horizontal state, the process proceeds to step S71. When the determination is NO, that is, when the vehicle is in the non-horizontal state, the process proceeds to step S72.
In step S71, the same processing as in steps S23 to S27 described above with reference to FIG. 6, that is, the swing angle output processing B is performed, and the process returns to step S64. In other words, in the traveling state, the indicated value calculated based on the liquid level that changes every moment on the flat ground is displayed, and the response of the display performed with the calculated indicated value as the target value when there is no refueling becomes slow, and the flat road running is performed. If the liquid level fluctuates occasionally, the indication value is less affected by this fluctuation.

On the other hand, in the above step S72, 6 km every time corresponding to the sampling period is used.
16 obtained by reducing fuel consumption at the rate of
A target value is calculated by weighted averaging based on this data.
By this processing, the CPU 33 determines that the vehicle travels a predetermined distance per unit amount when the inclination detecting means detects the non-horizontal state during the traveling of the vehicle, and according to the traveling distance from the current instruction value at predetermined time intervals. The instruction value of the remaining fuel amount is calculated by sequentially subtracting predetermined values.

Thereafter, the flow advances to step S73, in which the target value is stored in the fourth target value storage area 346 and thereafter, the deflection angle output processing E included in the processing routine executed at regular time intervals.
Proceeding to FIG. 15, in the first step S74, it is determined whether or not the target value of the fourth target value storage area 346 in the RAM 34 is equal to the current swing angle value storage area 343. If this determination is NO, the process proceeds to step S75 to determine whether or not the timer flag FT6 in the RAM 34 is ON. If this determination is NO, the process proceeds to step S75.
Proceeding to 76, the N second timer in the RAM 34 is started and the timer flag FT6 is set. Thereafter, the process proceeds to step S77 to determine whether N seconds have elapsed. If the determination in step S77 is YES, the process proceeds to step S7.
In step S8, the swing angle value data in the current swing angle value storage area 343 in the RAM 34 is incremented or decremented by a predetermined angle value corresponding to, for example, 1 bit, and output to the cross coil driver 6 and a timer. The flag FT6 is turned off. As a result, the target value obtained for each constant time Q is stored in the fourth target value storage area 346 in the RAM 34, and the pointer is moved one bit every N seconds toward the target value.

Note that the determination in step S74 is YES.
In this case, the swing angle output processing E is terminated without doing anything. If the determination in step S77 is NO and N seconds have not elapsed, step S78 is skipped and the swing angle output processing E
To end. As described above, even if the liquid level of the fuel in the combustion tank of the vehicle changes while traveling on the slope, the detection is not performed and the display based on the fuel signal generated by the fuel sensor 1 is not performed. The decrease in the fuel remaining amount consumed by the traveling of the vehicle is reflected in the indicated value with a certain degree of accuracy.

Next, CPU transition standby processing (FIG. 1)
In 6), first, in process SF1, the end of the remaining fuel amount display is requested to the cross coil driver 6;
The display of the remaining fuel amount is ended by the cross coil driver 6. Then, it is judged in the processing S2, reads the status of the tilt sensor switch 5 is connected to the input port I _4, whether the vehicle by the state of the read gradient sensor switch 5 is in a horizontal state.

Here, the determination in step SF2 is YE
In the case of S, that is, when the vehicle is in the horizontal state, the process proceeds to step SF3. In step SF3, a T-second timer in the timer area 348 of the RAM 34 is started. Thereafter, the process proceeds to step SF4 to determine whether or not T seconds have elapsed. If the determination in step SF4 is YES, the process proceeds to process ST0. In the process ST0, the swing angle of the pointer is calculated based on the analog fuel signal from the fuel sensor 1 as the remaining amount.
The data is stored in the first target value storage area 342 in the RAM 34 by the shake angle conversion processing. Then, step SF5
In the first target value storage area 342 of the RAM 34
Is stored in the target value storage area 81 in the NVM 8 as the target value when the IGN switch was turned off last time, and then the process proceeds to step SF7,
, The CPU 33 is set to the standby state, and then the CPU 33 waits until the IGN switch is turned on again.

As described above, when the vehicle is in the horizontal state, the IG
The target value of the remaining fuel amount by the calculating means after a lapse of a predetermined time from the turning off of the N switch is stored in the storing means as the target value when the IGN switch was turned off last time. Therefore, IGN
Even if the liquid level of the fuel fluctuates when the switch is turned off, an accurate indication of the remaining fuel amount can be stored without being affected by the fluctuation.

On the other hand, when the determination in step SF2 is NO, that is, when the vehicle is in the non-horizontal state, step S
Go to F6. In step SF6, the swing angle value stored in the current swing angle value storage area 343 in the RAM 34 is set to N as a target value when the IGN switch is turned off.
It is stored in the target value storage area 81 in the VM 8. afterwards,
Proceed to step SF7, and in step SF7, CP
U33 is set to the standby state, and then waits until the IGN switch is turned on again.

As described above, when the vehicle is in the non-horizontal state, I
Indication of the accurate remaining fuel amount corrected for the influence of the inclination of the vehicle displayed on the fuel gauge when the IGN switch is off, instead of the target value of the remaining fuel amount by the calculating means after a certain time has elapsed since the GN switch was turned off. The value is stored in the storage means as a target value when the IGN switch was turned off last time. Therefore,
Even when the ignition switch is turned off on a slope, an accurate target value of the remaining fuel amount can be stored.

As described above, when the vehicle is in a horizontal state and the IGN switch is turned off, a certain period of time has elapsed since the IGN switch was turned off, that is, a state where the fuel level in the fuel tank is stable. By storing the remaining amount of fuel at the time, the indication value of the remaining amount of fuel can be accurately stored without being affected by the fluctuation of the fuel level when the IGN switch is turned off. Further, when the vehicle is in a non-horizontal state and the IGN switch is turned off, the indication value of the remaining fuel amount displayed on the display means is stored in the storage means, so that the vehicle stops on the slope. The change in the liquid level of the fuel in the combustion tank of the vehicle caused by the change in the fuel level can be stored in the storage means. Therefore, immediately after the IGN switch is turned on,
There is no display of the remaining fuel amount affected by the change in the fuel level in the combustion tank due to the inclination of the vehicle.

Therefore, the accurate remaining fuel amount in the fuel tank after the IGN switch is turned off, which is stored in the storage means,
By displaying immediately after the N switch is turned on, the IG
Since the accurate fuel remaining amount can be promptly displayed even immediately after the N switch is turned on, it is difficult to display the accurate fuel remaining amount immediately after the IGN switch is turned on, which occurs in the conventional fuel remaining amount display device. It is possible to solve the problem that there is.

In the above description of the embodiment, the installation location of the inclination sensor switch 5 is not particularly mentioned. However, generally, the inclination sensor switch 5 is generally mounted on the back of the vehicle combination meter case in which the vehicle fuel remaining amount display device is built. It can be installed, and when installed in this way, it is not necessary to route the signal line as compared with the case where it is installed elsewhere in the vehicle body, and it can be handled integrally with the combination meter, and in terms of assembly workability etc. It is also advantageous in that noise resistance is improved and that measures against water exposure are not required.

In the description of the above embodiment,
The indication value of the remaining fuel amount stored when the GN switch is off is displayed from immediately after the IGN switch is turned on until the engine is turned on. However, the present invention is not limited to this embodiment. IGN only immediately after turning on
The present invention can also be applied to an embodiment in which an instruction value of the remaining fuel amount stored when the switch is off is used.

[0098]

As described above, according to the vehicle fuel display device of the present invention as set forth in claim 1, the indication value of the remaining fuel amount from the calculating means after a lapse of a predetermined time after the ignition switch is turned off is stored. Even if the ignition switch is turned off while the fuel level in the fuel tank is shaking after a sudden stop of the vehicle, etc., the fuel level is not affected by the fuel level shaking. The remaining amount can be accurately detected and stored. In addition, the indicated value of the remaining fuel amount immediately after the ignition switch is turned on is based on the indicated value of the remaining fuel amount in the fuel tank in a state where the fuel level in the fuel tank after the turning off of the ignition switch is stored in the storage means. Since it is displayed on the display means by the display control means,
It is possible to prevent an erroneous display of the fuel remaining amount display immediately after the ignition switch is turned on. Therefore, it is possible to improve the accuracy of the fuel remaining amount display immediately after the ignition switch is turned on.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described above, when the indicated value of the remaining fuel amount when the ignition switch is turned off is unknown, the same value as the indicated value of the remaining fuel amount when the ignition switch is turned off is not stored in the storage means. In such a case, the indication value of the remaining fuel amount calculated by the calculation means is displayed on the display means, so that when the ignition switch is turned on, even if the indication value of the remaining fuel quantity is not stored in the storage means, it is displayed on the display means. Nothing disappears.

According to the third aspect of the present invention, the first aspect is provided.
Or, in addition to the effect of the invention described in 2 above, immediately after the ignition switch is turned off, it is determined whether or not the vehicle is tilted by a predetermined angle or more, and if the tilt is detected by a predetermined angle or more, the fuel displayed when the ignition switch is turned off is displayed. Since the instruction value of the remaining amount is stored in the storage means, the instruction value of the remaining fuel amount in which the change in the liquid level of the fuel in the combustion tank of the vehicle caused by the vehicle stopping on the slope is canceled is stored. Can be stored. Therefore, even when the vehicle is leaning and is not in a horizontal state, it is almost unaffected by this, and an accurate indication of the remaining fuel amount can be promptly displayed on the display means immediately after the ignition switch is turned on.

According to the invention set forth in claim 4, claim 1 is provided.
In addition to the effects of the present invention, immediately after the ignition switch is turned on, the display control means takes a difference between the instruction value stored in the storage means and the instruction value calculated by the arithmetic means, and calculates the difference. When the fuel supply is detected by the replenishment detecting means for detecting the presence or absence of fuel replenishment when the fuel supply amount is equal to or more than a predetermined value, an indication value of the remaining fuel replenishment is displayed on the display means 7. Therefore, even if fuel is supplied while the ignition switch is turned off, the indication value of the remaining fuel amount that has been increased by refueling immediately after the ignition switch is turned on can be displayed on the display means.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of a vehicle fuel remaining amount display device of the present invention.

FIG. 2 is a diagram showing an embodiment of a vehicle fuel remaining amount display device according to the present invention.

FIG. 3 is a view showing various areas in a RAM included in μCOM in FIG. 2;

FIG. 4 is a diagram showing various areas in the nonvolatile memory in FIG. 2;

FIG. 5 is a flowchart showing a part of a process performed by μCOM of the arithmetic control unit in FIG. 2;

FIG. 6 is a flowchart showing another part of the processing performed by the μCOM of the arithmetic control unit in FIG. 2;

FIG. 7 is a flowchart showing yet another portion of the processing performed by the μCOM of the arithmetic control unit in FIG. 2;

8 is a flowchart illustrating another part of the processing performed by the μCOM of the arithmetic control unit in FIG. 2;

FIG. 9 is a flowchart showing the content of a remaining amount-shake angle conversion process in FIG. 6;

FIG. 10 is a flowchart showing the contents of a mode setting process in FIG. 6;

11 is a flowchart showing the contents of a swing angle output process A in FIG. 6;

FIG. 12 is a flowchart showing the contents of a swing angle output process B in FIG. 6;

FIG. 13 is a flowchart showing the contents of a swing angle output process C in FIG. 6;

14 is a flowchart showing the contents of a swing angle output process D in FIG. 7;

FIG. 15 is a flowchart showing the contents of a swing angle output process E in FIG. 8;

FIG. 16 is a flowchart showing the contents of a CPU transition standby process in FIG. 6;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fuel sensor 5 tilt detecting means (tilt sensor switch) 7 display means (cross coil) 8 storage means (non-volatile memory, NVM) 33-1 arithmetic means (CPU) 33-2 display control means (CPU) 33-3 replenishment Detection means (CPU)

Claims (4)

[Claims] 1. A display means for displaying an indicated value, a fuel sensor for detecting a liquid level of fuel in a combustion tank of a vehicle to generate a fuel signal, and a fuel signal input from the fuel sensor for inputting a fuel signal. Calculating means for calculating the indicated value of the remaining amount, and storage means for storing the indicated value of the remaining fuel amount when the ignition switch is turned off, and for storing the stored indicated value also during a period in which the ignition switch is turned off. Display control means for controlling the display means to display the indicated value of the remaining fuel amount, and for storing the indicated value of the remaining fuel amount calculated by the calculating means in the storage means, the display control means comprising: A fuel remaining amount display device for a vehicle which displays an indication value of a remaining fuel amount stored in the storage means on the display means immediately after turning on an ignition switch; Storing the indicated value of the remaining fuel amount in the storage unit when the ignition switch is turned off, based on the indicated value of the remaining fuel amount calculated by the calculating unit after a lapse of a fixed time after the ignition switch is turned off. A fuel level display device for a vehicle, comprising: 2. The display control means according to claim 1, wherein, immediately after an ignition switch is turned on, when there is no indication of the remaining fuel amount stored in said storage means, said indication value of the remaining fuel quantity calculated by said calculation means is displayed. 2. A fuel level display device for a vehicle according to claim 1, wherein said means is displayed by means. 3. The display control means further comprises: a tilt detecting means for detecting a non-horizontal state in which the vehicle is tilted by a predetermined angle or more and a horizontal state other than the predetermined angle; 3. The vehicle fuel level display according to claim 1, wherein when the ignition switch is turned off, the fuel level indication value displayed on the display means is stored in the storage means. apparatus. 4. A difference between an instruction value stored in said storage means and an instruction value calculated by said arithmetic means is detected, and if the difference is equal to or greater than a predetermined value, the presence or absence of fuel supply is detected. When the ignition switch is turned on and the replenishment detecting means detects the presence of replenishment, the display control means causes the display means to display an instruction value of the remaining amount of refueled fuel. The vehicle fuel remaining amount display device according to any one of claims 1 to 3, wherein: