JP2001047877A - Fuel remaining amount display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel remaining amount display device for a vehicle capable of driving a needle up to target swing angle corresponding to the actual fuel remaining amount changed by oil supply without causing a sense of incongruity. SOLUTION: A fuel remaining amount display device for vehicle is provided with a drive means 6 driving a needle up to a target swing angle corresponding to the fuel remaining amount of a vehicle, an oil supply detection means 33a detecting whether oil is being supplied or not in accordance with the fuel remaining amount, and a control means 33b controlling the drive means 6 in such a way that a drive speed made of the needle becomes a high speed mode in accordance with the detection during oil supply of the oil supply detection means 33a. The device is further provided with a drive speed mode storage means 8a storing a drive speed mode when an ignition switch of the vehicle is turned off, and the control means 33b controls the drive means 6 based on the drive speed mode stored in the drive speed mode storage means 8a when the ignition switch is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel level indicator for a vehicle, and more particularly, to a target deflection angle corresponding to the fuel level when fueling is detected based on a change in the fuel level of the vehicle. The present invention relates to a vehicle fuel remaining amount display device that controls the driving so that the driving speed mode of the hands becomes the high-speed mode.

[0002]

2. Description of the Related Art Conventionally, a fuel level display device for a vehicle mounted on a vehicle has a liquid level detecting unit for detecting a liquid level of fuel in a fuel tank. The liquid level detection unit has a contact that slides on the resistor according to the position of the float floating on the fuel level, divides the voltage applied to both ends of the resistor, and outputs this voltage to the contact. Such a configuration is generally employed. Then, the driver is instructed of the remaining fuel amount by controlling the driving speed of the hands in accordance with the electrical characteristics of the liquid level detection unit, that is, the measured amount obtained by converting the change in the output voltage.

The driving speed mode for controlling the driving speed of the hands in such a fuel remaining amount display device for a vehicle has two modes, a normal mode for driving and a high speed mode for refueling. It is configured. In the normal mode, the pointer is controlled to be driven slowly so as not to pick up the liquid level fluctuation during running. In the high-speed mode, the pointer is controlled to be driven quickly in order to follow an increase in fuel during refueling.

A vehicle ignition switch (hereinafter referred to as I)
Immediately after the GN switch is turned on, the driving of the hands is controlled in the normal mode. After that, when the fuel remaining amount increases by a predetermined amount or more by refueling, the mode is changed from the normal mode to the high-speed mode. I was

[0005]

However, in the above-described conventional fuel remaining amount display device for a vehicle, the IGN switch is set to the O state.
Immediately after N, since the drive control of the hands was performed in the normal mode, the IGN switch is turned off during the high-speed mode at the time of refueling, and then, when the IGN switch is turned on again during the refueling, the drive speed mode becomes Even though refueling is in progress, the mode returns to the normal mode, and refueling at a predetermined increment or more is required to shift to the high-speed mode again. Therefore, if the refueling is completed before the refueling of the predetermined amount or more is detected, the hands are driven in the normal mode, and it is quite difficult to drive the hands to the actual fuel remaining amount indicating position. It took time. As described above, according to the conventional vehicle fuel remaining amount display device, depending on the timing of the OFF / ON operation of the IGN switch during refueling, the fuel remaining amount changed according to refueling is not promptly indicated, resulting in a sense of incongruity. Had the disadvantage of being lost.

FIG. 9 is a diagram for explaining the relationship between the remaining fuel and the IGN switch in the conventional fuel remaining display device for a vehicle. Details of the failure will be described below with reference to FIG. . The vertical axis indicates the fuel remaining amount indicating position indicated by the pointer according to the remaining fuel amount in the fuel tank, and the IGN switch state, and the horizontal axis indicates time. The fuel remaining amount indicating position indicates that the fuel in the fuel tank is full.
It is possible to designate a range from "F" indicating 1) to "E" indicating the remaining fuel amount is zero (Empty), and the middle of the range is indicated by "1/2". The dashed line G indicates the actual remaining fuel amount, and the solid line R indicates the fuel remaining amount indicating position of the pointer.

As shown in FIG. 9, at time t ₀ , I
When the GN switch state is ON and the fuel remaining amount is zero, the position indicated by the solid line R indicates "E". When refueling is started in this state, the drive control of the hands is started in the normal mode. You. At time t ₁ , it is recognized that refueling is being performed by detecting an increase of a predetermined amount P or more between the actual remaining amount of fuel indicated by the dashed line G and the position indicated by the pointer indicated by the solid line R. Then, in response to this recognition, the rotation control of the hands is shifted from the normal mode (section a = t ₁ -t ₀ ) to the high-speed mode.

Thereafter, at time t ₂ during refueling, IG
N switch is turned OFF, at time t _3, again IG
When the N switch is turned on, the conventional fuel level display device for a vehicle displays the pointer in the normal mode in the OGN switch ON state.
Since the vehicle was driven from the designated position at the time of FF, the vehicle returned from the high-speed mode to the normal mode despite refueling. Then, the start instruction from the small fuel quantity indication position than the actual fuel quantity indicated by a dashed line G, in t _4, when become full before detecting refueling of more than a predetermined increase amount P L Since the driving speed mode is not changed from the normal mode to the high-speed mode, it takes a considerable time to drive the hands to the full fuel remaining amount indicating position, and the hands are instructed to be lower than the actual fuel remaining amount. It looked as if it had solidified in position.

Accordingly, the present invention has been made in view of the above-described problems,
It is an object of the present invention to provide a vehicle fuel remaining amount display device capable of driving a pointer without a sense of incongruity up to a target deflection angle corresponding to an actual fuel remaining amount changed by refueling.

[0010]

According to the present invention, there is provided a fuel remaining amount display device for a vehicle according to the present invention, which solves the above-mentioned problems, as shown in FIG. Driving means 6 for driving the pointer to the target deflection angle corresponding to
And a refueling detecting means 33a for detecting whether or not refueling is being performed according to the remaining fuel amount, and a driving speed mode of the pointer is set to a high speed mode in response to the refueling detecting means 33a detecting during refueling. And the control means 33b for controlling the driving means 6 as described above.
The vehicle further includes a drive speed mode storage unit 8a for storing the drive speed mode when the ignition switch of the vehicle is turned off, and the control unit 33b stores the drive speed mode in the drive speed mode storage unit 8a when the ignition switch is turned on. The driving means 6 is controlled based on the driving speed mode.

According to the fuel level display device for a vehicle according to the present invention, when the refueling detecting means 33a detects that the fuel is being supplied, the control means 33b causes the driving means 6 to enter the high-speed mode. Is controlled. When the ignition switch is turned off, the drive speed mode at that time is stored in the drive speed mode storage means 8a. And when the ignition switch is turned on,
The control unit 8b controls the driving unit 6 based on the driving speed mode stored in the driving speed mode storage unit 8a. Therefore, the drive speed mode when the ignition switch is turned off is stored in the drive speed mode storage means 8a, and when the ignition switch is turned on, the drive means 6 is controlled based on the drive speed mode stored in the drive speed mode storage means 8a. Therefore, even if the ignition switch is turned off / on during refueling, it is possible to prevent the drive speed mode of the hands from returning from the high-speed mode to the normal mode. Therefore, since the hands can be driven in an accurate drive speed mode after the ignition switch is turned on, it is possible to promptly give an instruction close to the actual remaining fuel amount changed according to refueling. Since the feeling of incongruity does not occur in the instruction of the remaining amount, it is possible to improve the accuracy of the instruction of the remaining amount of fuel in the remaining fuel amount display device for a vehicle.

According to a second aspect of the present invention, there is provided a vehicle fuel level display device as set forth in the first aspect, wherein the vehicle travels as shown in a basic configuration diagram of FIG. The vehicle further includes a traveling start detecting unit 33c for detecting a start, and the control unit 33b recognizes that the driving speed mode stored in the driving speed mode storage unit 8a is the high speed mode when the ignition switch is turned on. Then, the driving unit 6 is controlled in the high-speed mode until the traveling start is detected by the traveling start detection unit 33c.

According to the second aspect of the present invention, when the ignition switch is turned on, the driving speed mode stored in the driving speed mode storage means 8a by the control means 33b is high. When the driving mode is recognized, the driving unit 6 is controlled in the high-speed mode until the traveling start of the vehicle is detected by the traveling start detecting unit 33c. Therefore, when the drive speed mode is recognized as the high-speed mode when the ignition switch is turned on, the drive means 6 is controlled in the high-speed mode from that time until the vehicle starts running, so that the fuel is quickly supplied. The pointer can be driven to a target deflection angle corresponding to the remaining amount. Therefore, after the ignition switch is turned on, the remaining fuel amount changed according to refueling can be indicated more quickly.

According to a third aspect of the present invention, there is provided a vehicle fuel level display device according to the first or second aspect, as shown in FIG.
The control unit 33b is configured to control the target deflection angle according to the remaining fuel amount when the ignition switch is turned on and the target deflection angle when the ignition switch is turned off stored in the target deflection angle storage unit 8b. When a difference equal to or more than a predetermined angle has not occurred, the target deflection angle is set to the target deflection angle stored in the target deflection angle storage means 8b, and the control means 33b further comprises: When the drive speed mode stored in the drive speed mode storage means 8a is recognized to be the high speed mode at the time of ON, the target deflection angle is set to the target deflection angle according to the remaining fuel amount at that time. It is characterized by.

According to the third aspect of the present invention, when the ignition switch is turned on, the driving speed mode stored in the driving speed mode storing means 8a by the control means 33b is high. If the mode is recognized, the target deflection angle is set to a target deflection angle corresponding to the remaining fuel amount at that time. Therefore, if the drive speed mode is recognized as the high-speed mode when the ignition switch is turned on, the target deflection angle is not the target deflection angle when the ignition switch is turned off, but the target deflection angle according to the remaining fuel amount when the ignition switch is turned on. Therefore, the target deflection angle when the ignition switch is turned on can be set to a target deflection angle corresponding to the remaining fuel amount changed by refueling while the ignition switch is turned off. Accordingly, an instruction close to the actual remaining fuel level can be made immediately after the ignition switch is turned on, so that the accuracy of the remaining fuel level indication in the vehicle remaining fuel level display device can be further improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fuel remaining amount display device for a vehicle according to the present invention will be described below with reference to FIGS.

FIG. 2 is a system configuration diagram showing an example of a schematic configuration of a vehicle fuel remaining amount display device according to the present invention.
FIG. 4 is a diagram showing an example of a memory map of a RAM included in μCOM in FIG. 2, FIG. 4 is a diagram showing an example of a memory map of a backup RAM included in μCOM in FIG. 2, and FIG. FIG. 6 is a diagram illustrating an example of a memory map of the NVM. FIG. 6 is a flowchart illustrating a part of a processing outline performed by the CPU in FIG. 2, and FIG. 7 illustrates another part of a processing outline performed by the CPU in FIG. 2. It is a flowchart, FIG.
FIG. 4 is a diagram for explaining a relationship between a fuel remaining amount and an IGN switch in the vehicle fuel remaining amount display device.

In FIG. 2, a sensor 1 for detecting a liquid level of fuel in a combustion tank of a vehicle and generating 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, and one end of the resistor 1a is connected to an operating power supply V _CC 1 via a resistor 2. The other ends are each 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,
A voltage obtained by dividing the voltage applied to both ends of the resistor 1a is output as an analog fuel signal, and this is output via a signal line L1 to an input port I _{1 of} a microcomputer (μCOM) 3.
Is applied.

The μCOM 3 converts an analog fuel signal input to the input port I ₁ into a digital signal and obtains a digital fuel signal by an analog / digital (A / D) converter 31.
A read-only memory (ROM) 32 that stores programs and fixed data, and a central processing unit (CP) that executes processing in accordance with the programs stored in the ROM 32.
U) 33, a readable and writable memory (RAM) 34 having a data area for storing various data generated in the course of the processing of the CPU 33 and a work area used for the processing, It has a built-in backup RAM 35 that can hold the stored contents for a while.
The μCOM 3 also has a power port V _CC , a ground port GND, input ports I ₂ and I ₃ , an input / output port IO, and an output port O ₁ , 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 is supplied. μCOM
The other end of the grounded resistor 1a is connected to the third earth port GND via an earth line L3.

One end of an ignition switch (IGN switch) 5 of the vehicle is connected to the input port I _{2 of the} μCOM 3. And the other end of the IGN switch 5
The cathode of the diode 5a is connected to one end of each of the capacitor 5b, the resistor 5c, and the resistor 5d. The anode of the diode 5a and the other ends of the capacitor 5b and the resistor 5c are grounded. And
The other end of the resistor 5d is connected to the operating power supply V _CC 2.

A cross coil driver 6 as a driving means is connected to the output port O _{1 of the} μCOM 3. μ
The CPU 33 of the COM 3 outputs the deflection angle to the cross coil driver 6. The cross-coil driver 6 to which the swing angle is input is applied to the cross coil 7 composed of a pair of coils 71 and 72, which are crossed and wound, and provided in a cross-coil instrument. By passing the drive current, a combined magnetic field is generated in the cross coil 7 according to the deflection angle of the pointer.

The cross coil 7 formed by crossing and winding a pair of coils 71 and 72 has a space formed therein. A rotor magnet (not shown) in which NS poles are radially magnetized is rotatably arranged in this space, and the NS poles are rotated so as to match the direction of the composite magnetic field. By rotating the pointer in accordance with the rotation of the rotor magnet, the remaining fuel amount can be displayed by the indicated value of the pointer. Although the vehicle fuel remaining amount display device according to the present embodiment enables the driving of the hands within a range of 90 degrees, the configuration may be such that the hands are driven in other ranges.

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. Then, the input port I ₃ of μCOM3 is running sensor 9 is connected for outputting a driving pulse signal according to the running of the vehicle.

In the above configuration, the CPU of μCOM3
33 reads the state of the power supply port V _CC and the states of the input ports I _{1 to} I ₃ according to the program stored in the ROM 32 and performs predetermined processing.
Output data to ₁

Specifically, the CPU 33 of the μCOM 3
Determining monitors the input port I _2, that the ignition switch 5 of the vehicle is turned on by the rising, that turned off by falling respectively. Also,
The CPU 33 of the μCOM 3 causes the A / D converter 31 to A / D convert the analog fuel signal input to the input port I ₁ to obtain a digital fuel signal, and based on the digital fuel signal, the target deflection angle of the pointer Is determined.

Next, referring to FIG. 3, the RAM 34 in FIG.
An example of the memory map will be described. In FIG. 3, RA
M34 is a target deflection angle storage area 341 in which the target deflection angle of the hands according to the remaining fuel amount obtained based on the analog fuel signal from the sensor 1 is stored, and the current deflection in which the current deflection angles of the hands are stored. It has various storage areas such as a corner storage area 342.

Next, an example of a memory map of the backup RAM 35 in FIG. 2 will be described with reference to FIG. As shown in FIG. 4, the backup RAM 35 stores a drive speed mode storage area 351, in which a drive speed mode indicating the drive speed of the hands is stored in a normal mode assuming that the vehicle is running and a high speed mode assuming that the vehicle is refueling. It is configured to have various storage areas such as an IGN off target shake angle storage area 352 for storing a target shake angle when the IGN switch 5 is off. When the drive speed mode is the normal mode, the pointer is controlled to be driven slowly so as not to pick up the liquid level fluctuation during traveling, and when the drive speed mode is the high speed mode, in order to follow the increase in fuel during refueling. It is controlled to drive the hands quickly.

Next, an example of a memory map of the NVM 8 in FIG. 2 will be described with reference to FIG. In FIG. 5, NVM
Numeral 8 includes various storage areas such as a refueling determination predetermined swing angle storage area 81 in which a refueling determination predetermined swing angle value corresponding to a predetermined increase amount that is a set value for determining refueling is stored.

Next, an example of the outline of the processing according to the present invention performed by the CPU 33 shown in FIG. 2 will be described below with reference to the flowcharts of FIGS.

In FIG. 6, when the CPU 33 is activated and the program is started in a standby state in which the number of clocks is reduced by the supply of electric power from the battery of the vehicle, the IGN based on the input signal from the IGN switch 5 is started in step S1. It is determined whether the switch 5 is ON. The IGN switch 5 is not ON, ie, O
When it is determined to be FF (N in step S1), the ON processing of the IGN switch 5 is constantly monitored by periodically performing the determination processing in step S1. Until the IGN switch 5 is turned on in step S1, the CPU 33 operates with power saving.

On the other hand, if it is determined in step S1 that the IGN switch 5 is ON (Y in step S1), the process proceeds to step S2. Then, in step S2, the CP
By increasing the number of clocks of U33, CPU startup processing is executed, and thereafter, the process proceeds to step S3. That is, C
CPU 3 operating with power saving by PU start processing
3 will operate normally.

[0033] In step S3, the analog fuel signal input port I ₁ is the digital fuel data obtained by A / D conversion by the A / D converter 31, deflection according to the fuel quantity on the basis of the digital fuel data The angle is calculated, and the calculated deflection angle is stored in the target deflection angle storage area 341 of the RAM 34 as the target deflection angle, whereby the remaining fuel amount grasping process is executed, and then the process proceeds to step S4.

In step S4, the backup RA
Based on the drive speed mode stored in the drive speed mode storage area 351 of M35, it is determined whether or not the drive speed mode was the high-speed mode when the IGN switch 5 was turned off last time. When it is determined that the drive speed mode is the high-speed mode (Y in step S4), the process proceeds to step S5.

In step S5, the backup RA
Drive speed mode storage area 351 of M35 and RAM 34
The current shake angle is calculated by a calculation formula based on the drive speed mode and the target shake angle stored in the target shake angle storage area 341, respectively, and the current shake angle is stored in the RAM.
The fuel amount is stored in the current deflection angle storage area 342 and output to the cross coil driver 6 to execute the remaining fuel amount instruction process, and then the process proceeds to step S6.
At this time, since the high-speed mode is stored in the drive speed mode storage area 351 of the backup RAM 35, the cross-coil driver 6 generates a pulse-shaped drive current corresponding to the current swing angle input from the CPU 33 by the cross-coil 7 The pointer is moved in the high-speed mode to a position corresponding to the current swing angle.

[0036] In step S6, based on input signals from the travel sensor 9 are input via the input port I _3, speed of the vehicle is determined whether 0 km / h. If the speed is not 0 km / h, that is, if it is determined that the vehicle is traveling (N in step S6), the process proceeds to step S14 shown in FIG. On the other hand, when it is determined that the speed is 0 km / h, that is, when the vehicle is stopped (Y in step S6), the process proceeds to step S7.

[0037] In step S7, the analog fuel signal input port I ₁ is the digital fuel data obtained by A / D conversion by the A / D converter 31, deflection according to the fuel quantity on the basis of the digital fuel data The angle is calculated, and the calculated deflection angle is stored as the target deflection angle in the target deflection angle storage area 341 of the RAM 34, whereby the remaining fuel amount grasping process is executed, and then the process proceeds to step S8.

In step S8, the backup RA
Drive speed mode storage area 351 of M35 and RAM 34
The current shake angle is calculated by a calculation formula based on the drive speed mode and the target shake angle stored in the target shake angle storage area 341, respectively, and the current shake angle is stored in the RAM.
The remaining fuel amount is stored in the current deflection angle storage area 342 and output to the cross coil driver 6 to execute the remaining fuel amount instruction process, and then the process proceeds to step S9.
Since the high-speed mode is stored in the drive speed mode storage area 351 of the backup RAM 35 at this time, the cross coil driver 6 generates a pulse-shaped drive current corresponding to the current swing angle input from the CPU 33 by the cross coil 7. The pointer is moved in the high-speed mode to a position corresponding to the current swing angle.

[0039] In step S9, based on the input signal from the IGN switch 5 input via the input port I _2, whether IGN switch 5 is OFF is determined. If it is determined that the IGN switch 5 is not OFF (N in step S9), the process returns to step S6,
A series of processes will be repeated. On the other hand, when it is determined that the IGN switch 5 is OFF (step S9).
Y), and proceeds to step S20 shown in FIG.

If it is determined in step S4 that the driving speed mode was not the high-speed mode when the IGN switch 5 was turned off last time (N in step S4), the process proceeds to step S10.

In step S10, the deflection angle between the current target deflection angle stored in the target deflection angle storage area 341 of the RAM 34 and the target deflection angle stored in the IGN off target deflection angle storage area 352 of the backup RAM 35. The difference is calculated, and it is determined whether or not the shake angle difference is larger than the refueling determination predetermined shake angle stored in the refueling determination predetermined shake angle storage area 81 of the NVM 8 to determine the IG.
It is determined whether or not refueling of a predetermined amount (P liter) or more has occurred while the N switch 5 is OFF. If it is determined that the deflection angle difference is larger than the predetermined refueling determination deflection angle, that is, it is determined that refueling of P liters or more has been performed (Y in step S10), the process proceeds to step S11.

In step S11, the backup R
Drive speed mode storage area 351 of AM 35 and RAM 3
The current shake angle is calculated by a calculation formula based on the drive speed mode and the target shake angle stored in the target shake angle storage area 341 of No. 4 respectively.
It is stored in the current swing angle storage area 342 of M34 and output to the cross coil driver 6, whereby the remaining fuel amount instruction process is executed, and thereafter, the process proceeds to step S13 shown in FIG. And at this time, the backup RAM
Since the normal mode is stored in the drive speed mode storage area 351 of 35, a pulse-like drive current corresponding to the current swing angle input from the CPU 33 is supplied to the cross coil 7 by the cross coil driver 6. The pointer is moved in the normal mode to a position corresponding to the current swing angle.

On the other hand, in step S10, the swing angle difference is equal to or less than the predetermined swing angle value for refueling determination, that is, the IGN switch 5
If it is determined that there is no refueling of P liters or more during OFF (NO in step S10), the process proceeds to step S12. Then, in step S12, the IGN-off target swing angle storage area 352 of the backup RAM 35 is set.
The current shake angle is calculated by a calculation formula based on the target shake angle and the drive speed mode stored in the drive speed mode storage area 351 and the drive shake mode, respectively.
By being stored in the current swing angle storage area 342 of M34 and being output to the cross coil driver 6, the last time IGN switch OFF fuel remaining amount instruction processing is executed, and thereafter, the process proceeds to step S13 shown in FIG.

At this time, the backup RAM 35
Since the normal mode is stored in the drive speed mode storage area 351 of FIG.
The pointer is moved in the normal mode to a position corresponding to the target shake angle when the IGN switch 5 is turned off by supplying a pulse-like drive current according to the current shake angle input from the CPU 33 to the cross coil 7.

In step S13 shown in FIG. 7, the A / D converter 31 converts the analog fuel signal of the input port I ₁ into an A / D signal.
/ D conversion to obtain digital fuel data, a deflection angle corresponding to the remaining fuel amount is calculated based on the digital fuel data, and the calculated deflection angle is stored in the RAM 34 as a new target deflection angle. By being stored in the area 341, the fuel remaining amount updating process is executed, and then the process proceeds to step S14. Note that the target deflection angle is updated by the fuel remaining amount update process in step S14.

In step S 14, the difference between the current shake angle stored in the current shake angle storage area 342 of the RAM 34 and the target shake angle stored in the target shake angle storage area 341 is calculated. The difference is NVM8
It is determined whether or not the refueling determination predetermined swing angle stored in the refueling determination predetermined shake angle storage area 81 is larger than the predetermined increase amount (P liter). If it is determined that the deflection angle difference is equal to or less than the predetermined refueling determination deflection angle, that is, it is determined that there is no refueling of P liters or more (N in step S14), step S17 is performed.
Proceed to. On the other hand, when it is determined that the deflection angle difference is larger than the predetermined deflection angle for refueling, that is, when it is determined that refueling of P liters or more has occurred (Y in step S14), the process proceeds to step S15.

In step S15, the input port I ₃
It is determined whether or not the speed of the vehicle is 0 km / h based on an input signal from the travel sensor 9 inputted via the vehicle. If the speed is 0 km / h, that is, if it is determined that the vehicle is stopped (Y in step S15), step S15 is performed.
Proceed to 16. Then, in step S16, the drive speed mode storage area 351 of the backup RAM 35
Then, the high-speed mode is stored, whereby the high-speed mode setting process is executed, and thereafter, the process proceeds to step S18.

On the other hand, in step S15, the speed is 0 km / h
Otherwise, that is, when it is determined that the vehicle is running (N in step S15), the process proceeds to step S17. Then, in step S17, the backup RAM 3
The normal mode is stored in the drive speed mode storage area 351 of No. 5 to execute the normal mode setting process, and then the process proceeds to step S18.

In step S18, the backup R
Drive speed mode storage area 351 of AM 35 and RAM 3
The current shake angle is calculated by a calculation formula based on the drive speed mode and the target shake angle stored in the target shake angle storage area 341 of No. 4 respectively.
By being stored in the current swing angle storage area 342 of M34 and being output to the cross coil driver 6, the remaining fuel amount instruction processing is executed, and then the process proceeds to step S19. Then, the CPU is operated by the cross coil driver 6.
When the pulse-shaped drive current corresponding to the current shake angle input from 33 is passed through the cross coil 7, the hands are stored in the drive speed mode storage area 351 of the backup RAM 35 up to the position corresponding to the current shake angle. It is moved at a speed according to the drive speed mode.

In step S19, the input port I ₂
It is determined whether or not the IGN switch 5 is OFF based on an input signal from the IGN switch 5 input via the. If it is determined that the IGN switch 5 is not OFF (N in step S19), the process returns to step S13, and a series of processes is repeated. On the other hand, IGN
If it is determined that the switch 5 is OFF (Y in step S19), the process proceeds to step S20.

In step S20, the target deflection angle stored in the target deflection angle storage area 341 of the RAM 34 is stored in the target deflection angle storage area 352 of the backup RAM 35 when the IGN switch is turned off. A quantity storage process is executed, and then the process proceeds to step S22.

In step S21, CPU standby transition processing is executed to reduce the number of clocks of the CPU 33 to a standby state. Thereafter, the flow returns to step S1 to wait for the IGN switch 5 to be turned on again.

As is clear from the above description, the presence or absence of refueling is detected and the cross coil driver (drive means) 6 is controlled by the flowcharts shown in FIGS.
Since the start of running of the vehicle is detected, the CPU 33 functions as a refueling detecting unit, a control unit, and a running start detecting unit in the claims.

When the IGN switch 5 is turned on, the drive speed mode storage area 351 of the backup RAM 35
Stores a drive speed mode when the IGN switch 5 is turned off. The target swing angle according to the remaining fuel amount when the IGN switch 5 is off is stored in the IGN off target swing angle storage area 352. Therefore, as is apparent from the above description, the backup RAM 35 functions as a driving speed mode storage unit and a target deflection angle storage unit in the claims.

Next, an example of the operation (operation) of the present embodiment having the above-described configuration will be described with reference to FIG. 8 shows, similarly to FIG. 9, the fuel remaining amount indicating position and the IGN switch state indicated by the hands according to the fuel remaining amount in the fuel tank, and the horizontal axis shows time. The fuel remaining amount indicating position indicates that the fuel in the fuel tank is full.
It is possible to designate a range from "F" indicating 1) to "E" indicating the remaining fuel amount is zero (Empty), and the middle of the range is indicated by "1/2". The dashed line G indicates the actual remaining fuel amount, and the solid line R indicates the fuel remaining amount indicating position of the pointer.

At time t ₀ , since the position indicated by the solid line R, which is the position indicated by the pointer, is “E”, the driver recognizes that the remaining fuel amount is zero, and the IGN switch 5 is turned on. Starts refueling. Then, when refueling of P liters or more is detected (Y in step S14), and when it is detected that the speed of the vehicle is 0 km / h (Y in step S15), the drive speed mode is changed from the normal mode to the high speed mode. Is performed (step S16). Then, in the high-speed mode, the remaining fuel amount changed according to refueling is indicated (step S18).

When the IGN switch 5 is detected to be OFF during refueling at time t ₁ (Y in step S19),
The target shake angle stored in the target shake angle storage area 341 of the RAM 34 is stored in the IGN-off target shake angle storage area 352 of the backup RAM 35 (step S20), and then the CPU 33 shifts to the CPU standby state (step S20). Step S21).

At time t ₂ , when the ON of the IGN switch 5 is detected during refueling (Y in step S 1), the CP
U33 is activated (step S2), and the remaining fuel amount at that time is detected (step S3). At this time, the drive speed mode storage area 351 of the backup RAM 35
Is the high-speed mode (Y in step S4), the fuel remaining amount is designated in the high-speed mode immediately after the IGN switch 5 is turned on (step S4).
5).

The indication of the remaining fuel amount in the high-speed mode is as follows.
The process is performed while the speed of the vehicle is 0 km / h, that is, until the traveling starts or the IGN switch 5 is turned off (steps S6 to S9). Then, during the high-speed mode, a speed greater than 0 km / h is detected, that is,
If the start of traveling is detected (N in step S6), it means that refueling has been completed, and thereafter, the drive speed mode is changed from the high-speed mode to the normal mode (step S17), and the fuel remaining amount is changed in the normal mode. Is instructed (step S18).

When the driving speed mode is the normal mode when the IGN switch 5 is ON (N in step S4), if the supply of P liters or more while the IGN switch 5 is OFF is detected (Y in step S10). ), And is instructed by a target deflection angle corresponding to the remaining fuel amount at that time. On the other hand, OF
If there is no more than P liters of fuel during F (N in step S10), the remaining fuel amount corresponding to the target swing angle stored in the IGN off target swing angle storage area 352 of the backup RAM 35 is indicated. .

As described above, in the vehicular fuel remaining amount display device, when refueling is detected based on a change in the remaining fuel amount, the cross coil driver (drive means) 6 is controlled in the high-speed mode. Then, the IGN switch 5 is turned off.
When F is pressed, the drive speed mode and the target deflection angle at that time are stored in the backup RAM (drive speed mode storage means, target deflection angle storage means) 35. When the IGN switch 5 is turned on, the cross coil driver 6 is controlled based on the drive speed mode stored in the backup RAM 35.

Therefore, the drive speed mode when the IGN switch 5 is off is stored in the backup RAM (drive speed mode storage means) 35, and when the IGN switch 5 is on,
Since the cross coil driver (drive means) 6 is controlled based on the drive speed mode stored in the backup RAM 35, even if the IGN switch 5 is turned ON / OFF during refueling, the drive speed mode of the hands is changed from the high speed mode. It is possible to prevent returning to the normal mode.
Therefore, since the pointer can be driven in an appropriate driving speed mode after the IGN switch 5 is turned on, it is possible to promptly give an instruction close to the actual remaining fuel amount changed according to refueling. Since the feeling of strangeness does not occur in the instruction of the remaining fuel amount, the accuracy of the instruction of the remaining fuel amount in the vehicle remaining fuel amount display device can be improved.

When the driving speed mode stored in the backup RAM (driving speed mode storage means) 35 is recognized to be the high speed mode when the IGN switch 5 is turned on, the driving start of the vehicle is detected. The cross coil driver (drive means) 6 is controlled in a high-speed mode. Therefore, when the driving speed mode is recognized as the high-speed mode when the IGN switch 5 is turned on, the cross coil driver 6 is controlled in the high-speed mode from that time until the vehicle starts running. The pointer can be driven to the target deflection angle corresponding to the remaining fuel amount. Therefore, after the IGN switch 5 is turned on, it is possible to more promptly indicate the remaining fuel amount that has changed according to refueling.

Further, when the drive speed mode stored in the backup RAM (drive speed mode storage means) 35 is recognized to be the high speed mode when the IGN switch 5 is turned on, the target deflection angle indicates the remaining fuel amount at that time. Is set as the target deflection angle in accordance with. Therefore, if it is recognized that the drive speed mode is the high-speed mode when the IGN switch 5 is turned on, the target deflection angle is not the target deflection angle when the IGN switch 5 is turned off, but the target deflection according to the remaining fuel amount when the IGN switch 5 is turned on. The target deflection angle when the IGN switch 5 is turned on is IGN
It is possible to set the target deflection angle according to the remaining fuel amount changed by refueling while the switch 5 is off. Therefore, IGN
Immediately after the switch 5 is turned on, an instruction close to the actual remaining fuel amount can be made possible, so that the accuracy of indicating the remaining fuel amount in the vehicle remaining fuel amount display device can be further improved.

In the above-described embodiment, an embodiment will be described in which the drive speed mode is stored in the backup RAM 35 capable of retaining the stored contents even while the apparatus main body is off, and the drive speed mode is updated. However, the present invention is not limited to this. For example, the storage area of the driving speed mode is provided in the RAM 34 and is stored in the NVM 8 when the IGN switch 5 is turned off. It can also be in the form of

[0066]

As described above, according to the present invention, the drive speed mode when the ignition switch is turned off is stored in the drive speed mode storage means, and the ignition speed is stored in the drive speed mode storage means. When the switch is turned on, the driving means is controlled based on the driving speed mode stored in the driving speed mode storage means. Therefore, even if the ignition switch is turned off / on during refueling, the driving speed mode of the hands is high. It is possible to prevent the mode from returning to the normal mode. Therefore, since the hands can be driven in an accurate drive speed mode after the ignition switch is turned on, it is possible to promptly give an instruction close to the actual remaining fuel amount changed according to refueling. Since there is no sense of incongruity in the indication of the remaining amount, there is an effect that the accuracy of the indication of the remaining amount of the fuel in the vehicle remaining amount display device can be improved.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in the above, when it is recognized that the drive speed mode is the high-speed mode when the ignition switch is turned on, from that time until the vehicle starts running,
Since the driving means 6 is controlled in the high-speed mode, the hands can be quickly driven to the target deflection angle corresponding to the remaining fuel amount. Therefore, after turning on the ignition switch,
This has the effect that the remaining fuel amount changed according to refueling can be indicated more quickly.

According to the invention described in claim 3, according to claim 1
Or, in addition to the effect of the invention described in 2, if the drive speed mode is recognized as the high-speed mode when the ignition switch is turned on, the target deflection angle is not the target deflection angle when the ignition switch is turned off, but the fuel Since the target deflection angle corresponds to the remaining amount, the target deflection angle when the ignition switch is turned on can be set to the target deflection angle corresponding to the remaining fuel amount changed by refueling while the ignition switch is turned off. Therefore, it is possible to provide an instruction close to the actual remaining fuel amount immediately after the ignition switch is turned on, so that it is possible to further improve the accuracy of indicating the remaining fuel amount in the vehicle remaining fuel amount display device. To play.

[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 system configuration diagram showing an example of a schematic configuration of a vehicle fuel remaining amount display device according to the present invention.

FIG. 3 is a diagram showing an example of a memory map of a RAM included in μCOM in FIG. 2;

FIG. 4 is a backup RAM of μCOM in FIG. 2;
FIG. 3 is a diagram showing an example of a memory map of FIG.

FIG. 5 is a diagram illustrating an example of a memory map of the NVM in FIG. 2;

FIG. 6 is a flowchart showing a part of a processing outline performed by a CPU in FIG. 2;

FIG. 7 is a flowchart showing another part of the outline of the processing performed by the CPU in FIG. 2;

FIG. 8 shows the fuel remaining amount and I in the vehicle fuel remaining amount display device.
It is a figure for explaining the relation of a GN switch.

FIG. 9 is a diagram for explaining a relationship between a remaining fuel amount and an IGN switch in a conventional fuel remaining amount display device for a vehicle.

[Explanation of symbols]

6 Drive means (cross coil driver) 8a Drive speed mode storage means (backup RAM) 8b Target deflection angle storage means (backup RA
M) 33a Refueling detection means (CPU) 33b Control means (CPU) 33c Running start detection means (CPU)

Claims (3)

[Claims] A driving means for driving a pointer to a target deflection angle corresponding to a remaining fuel amount of the vehicle; a refueling detecting means for detecting whether or not refueling is being performed according to the remaining fuel amount; Control means for controlling the driving means so that the driving speed mode of the pointer is set to the high-speed mode in response to the detection during refueling of the vehicle, wherein the ignition switch of the vehicle is turned off. A drive speed mode storage unit that stores the drive speed mode when the ignition switch is turned on, based on the drive speed mode stored in the drive speed mode storage unit. A fuel level display device for a vehicle, wherein the driving means is controlled. 2. The vehicle according to claim 1, further comprising a traveling start detecting unit configured to detect a start of traveling of the vehicle, wherein the control unit is configured to switch the driving speed mode stored in the driving speed mode storage unit when the ignition switch is turned on. When it recognizes the high-speed mode,
The vehicle fuel remaining amount display device according to claim 1, wherein the driving unit is controlled in the high-speed mode until the traveling start is detected by the traveling start detection unit. 3. The target swing angle according to the fuel remaining amount when the ignition switch is turned on, and the target swing angle when the ignition switch is turned off stored in a target swing angle storage means. When the difference between the angle and the angle does not exceed a predetermined angle, the target deflection angle is set to the target deflection angle stored in the target deflection angle storage means, and further, the control means includes the ignition switch. When the drive speed mode stored in the drive speed mode storage means is recognized as the high speed mode, the target deflection angle is set to the target deflection angle corresponding to the remaining fuel amount at that time. 3. The method according to claim 1, wherein
The fuel remaining amount display device for a vehicle according to claim 1.