JP2010160085A - Residual oil quantity display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transit a residual oil quantity measuring means into an inactive state just after an IGN switch of a vehicle is turned off and to accurately display a fill-up state of a fuel tank. <P>SOLUTION: In this residual oil quantity display 10, when a switch detection means P2 detects turning-off of the IGN switch, a first state transition means P4 transits the residual oil quantity measuring means P1 into an inactive state from an active state. When an oil supply hole detection means P3 detects an open state of an oil supply hole during the inactive state, an oil information storage means 12 stores oil supply information. After that, when the switch detection means P2 detects turn-on of the IGN switch, a second state transition means P5 transits the residual oil quantity measuring means P1 into the active state and the residual oil quantity measuring means P1 measures a residual quantity of oil. When the oil supply information of the oil information storage means 12 indicates presence of oil, a fill-up display determination means P6 determines whether the residual quantity of oil at that time satisfies a forced fill-up display condition. A display control means P7 displays information regarding a forced fill-up display on a display means 13 in accordance with the determination that the residual quantity satisfies the forced fill-up display condition. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a residual oil amount display device that displays a residual oil amount of a fuel tank of a vehicle.

  The residual oil amount display device mounted on the vehicle has a mechanism for detecting the residual oil amount using a float that floats according to the liquid level in the fuel tank. The residual oil amount display device visually displays the residual oil amount detected using the mechanism. However, as shown in Patent Document 1 and the like, the phenomenon that the full tank display is not performed for a while after running after the fuel tank is fully filled has caused a sense of incongruity to the driver. Further, since the display content of the residual oil amount display device is required to be accurate, various techniques have been proposed.

  For example, in order to display the full tank display more accurately, the residual oil amount display device determines that the oil has been supplied when the amount of oil supply (the increase in oil amount) exceeds a certain amount, and forcibly I've been trying to do a full tank display. In addition, other residual oil amount display devices are known to switch display processing, which is normally delayed, to display processing with quick response when refueling in order to prevent swinging.

  However, when the vehicle is a rental car, when the vehicle is returned, or when the vehicle is full for traveling, the above-described refueling amount may be less than a certain amount. In this case, the remaining oil amount display device does not perform the oil supply determination and measures the remaining oil amount with a delayed normal responsiveness, so it takes time for the display to become full even though the tank is full. It was necessary. Also, when such a problem occurs when returning a rental car, the remaining oil amount display device is not fully filled, so a trouble occurs between the rental car company and the user, and the rental car return process is troublesome. There was a problem that it took.

  Further, after the ignition switch (IGN switch) of the vehicle is turned off, the liquid level in the fuel tank is not stable due to the vehicle stopping or the like, so that the full tank display may not be obtained. Therefore, other residual oil amount display devices are also considered to perform the above-mentioned fuel supply determination after stabilizing the liquid level in the fuel tank by providing a delay time such as 1 minute after the IGN switch is turned off. I came.

  However, if the liquid level in the fuel tank does not stabilize even when the delay time elapses, or if the vehicle is stopped on a hill or a stepped part, the correct amount of oil will not be obtained. In addition, as described above, there is a problem that the full tank display is delayed. Therefore, it is necessary to set the delay time long, but there is a problem that power is consumed even though the delay time is a time after the IGN switch is turned off. Further, when refueling is started within the delay time, there is a problem in that the refueling determination cannot be performed accurately because the remaining oil amount to be used as a reference cannot be accurately detected. For this reason, the set time of the delay time cannot be extended.

JP 2006-105602 A

  Therefore, in view of the above-described problems, the present invention has an object to provide a residual oil amount display device that can transition to an inactive state immediately after an ignition switch of a vehicle is turned off and that accurately displays a full fuel tank. .

  In order to solve the above problems, the residual oil amount display device according to claim 1 according to the present invention includes an inactive state for reducing power consumption and a transition from the inactive state as shown in the basic configuration diagram of FIG. And an active state for measuring the residual oil amount in the fuel tank of the vehicle, and a residual oil amount measuring means P1 comprising: a display means 13 for displaying the residual oil amount measured by the residual oil amount measuring means P1. In the residual oil amount display device 10, the switch detection means P2 for detecting on / off of the ignition switch of the vehicle, the fuel supply port detection means P3 for detecting the open / closed state of the fuel supply port of the fuel tank, First state transition means P4 for transitioning the residual oil amount measuring means P1 from an active state to an inactive state when a change from on to off of the ignition switch is detected based on the switch detection means P2. When the residual oil amount measuring means P1 is in an inactive state, the fuel supply information indicating the presence of fuel supply is stored when the change of the oil supply opening from the closed state to the open state is detected based on the oil supply opening detecting means P3. A second oil amount measuring means P1 that transitions from an inactive state to an active state when a change from the OFF to the ON state of the ignition switch is detected based on the oil supply information storing means 12 and the switch detecting means P2. When the remaining oil amount measuring means P1 is changed from the inactive state to the active state by the state transition means P5 and the second state transition means P5, the fueling information in the fueling information storage means 12 indicates that there is fueling. And a full tank display determining means P6 for determining whether the residual oil amount measured by the residual oil amount measuring means P1 satisfies a predetermined forced full tank display condition, and the full tank display determining hand. Depending on the determination that meets the forced full condition P6, a display control unit P7 for displaying the forced full displayed on the display unit 13, and having a.

  According to the residual oil amount display device of the present invention described in claim 1, the first state transition means P4 activates the residual oil amount measurement means P1 when the switch detection means P2 detects the ignition switch being turned off. To the inactive state. If the oil supply port detecting means P3 detects a change from the closed state of the oil supply port to the open state during the inactive state, there is a high possibility that the fuel supply has been performed, so the fuel supply information storage means 12 stores the fuel supply information. Thereafter, when the switch detection means P2 detects that the ignition switch is turned on, the second state transition means P5 causes the residual oil amount measurement means P1 to transition from the inactive state to the active state, so that the residual oil amount measurement means P1 Measure the amount. When the fuel supply information in the fuel supply information storage means 12 indicates that there is fuel supply, the full tank display determination means P6 determines whether or not the remaining oil amount at that time satisfies the forced full tank display condition. Then, in response to the determination that the forced full display is satisfied, the display control unit P7 displays the forced full display on the display unit 13.

  As described above, according to the residual oil amount display device of the present invention, the fuel supply information is stored when the opening / closing of the fuel filler opening is detected while the ignition switch is off, and then when the ignition switch is turned on, Based on the refueling information, it can be determined whether or not refueling is performed while the ignition switch is off. This eliminates the need to measure the amount of residual oil immediately after the ignition switch is turned off as in the prior art, so that the conventional delay time for waiting for the stabilization of the liquid level in the fuel tank is not required, and the ignition switch Since the residual oil amount measuring means can be shifted to the inactive state immediately after the power is turned off, unnecessary power consumption can be reduced. Also, when the ignition switch is turned on, the presence or absence of refueling can be determined based on the refueling information, and when it is determined that there is refueling, the remaining oil amount satisfies the forced full display condition Occasionally a full fill display was made. As a result, unlike after the ignition switch is turned off, the liquid level in the fuel tank is stable, so it is simply determined whether to perform forced full display based on the amount of remaining oil in the fuel tank. Can do. Therefore, it is not necessary to detect the amount of oil supply as in the prior art and determine whether or not to perform the forced full tank display based on the oil supply amount, and improve the determination accuracy of the forced full tank display based on the remaining oil amount. Therefore, the accuracy of forced full display can be improved. Therefore, since it is possible to transition to the inactive state immediately after the ignition switch of the vehicle is turned off and to accurately display the fuel tank fullness, it is possible to realize a display with quick response at the time of refueling. Therefore, it is possible to realize the residual oil amount display that does not cause a sense of discomfort. In addition, if the vehicle is a rental car, the accuracy of the determination of whether or not to display a forced full tank can be improved even if the amount of refueling is small, which occurs between the rental car company and the user. It is possible to prevent the trouble of the conventional oil supply.

It is a block diagram which shows the basic composition of the residual oil amount display apparatus of this invention. 1 is a system configuration diagram showing a schematic configuration of a vehicle communication system to which a residual oil amount display device according to the present invention is applied. It is a block diagram which shows an example of a structure of meter ECU in FIG. It is a block diagram which shows an example of a structure of opening sensor ECU in FIG. It is a flowchart which shows an example of the IGN off monitoring process which CPU in FIG. 3 performs. 4 is a flowchart showing an example of inactive state processing executed by a CPU in FIG. 3. It is a flowchart which shows an example of the fueling lid | cover interruption process which CPU in FIG. 3 performs. It is a flowchart which shows an example of the IGN ON process which CPU in FIG. 3 performs.

  Hereinafter, an embodiment of a residual oil amount display device according to the present invention will be described with reference to the drawings of FIGS.

  In FIG. 2, the vehicle communication system 1 is mounted on a vehicle such as a private car or a rental car. The vehicle communication system 1 includes a meter ECU 10, an opening sensor ECU 20, and a plurality of other ECUs 30. And each of meter ECU10, opening sensor ECU20, and several other ECU30 becomes a structure which can communicate via the vehicle-mounted network 3. FIG. The in-vehicle network 3 enables multiplex communication between the ECUs by CAN (Controller Area Network) which is an in-vehicle network standard.

  The plurality of other ECUs 30 include, for example, an ABS-ECU used for an anti-lock brake system (ABS), an ENG-ECU used for engine (ENG) control, an automatic transmission (AT) control, and the like. For example, an AT-ECU used for an air suspension, an AIRSUS-ECU used for an air suspension, an air tank ECU used for an air tank, a power supply ECU that controls power supply to each ECU, and the like can be cited as examples. However, a plurality of other ECUs 30 can be deleted from the system configuration because they are not directly related to the present invention.

  The meter ECU 10 measures the amount of remaining oil in the fuel tank 5 of the vehicle and displays it on the display unit 13. As is well known, the meter ECU 10 includes a microprocessor (MPU) 11 that operates according to a predetermined program. As is well known, the MPU 11 includes a central processing unit (CPU) 11a that performs various processes and controls according to a predetermined program, a ROM 11b that is a read-only memory storing a program for the CPU 11a, and various data. And a RAM 11c, which is a readable / writable memory having an area necessary for processing operations of the CPU 11a.

  The CPU 11a has an inactive state in which power consumption from the vehicle battery is reduced, and an active state in which various processes can be executed using the electric power after transition from the inactive state. When the ignition switch (IGN switch) 2 of the vehicle is switched from off to on, the CPU 11a transitions from the inactive state to the active state. The CPU 11a transitions from the active state to the inactive state when the IGN switch 2 is switched from on to off. That is, the CPU 11a is in an active state when the IGN switch 2 is on and in an inactive state when the IGN switch 2 is off.

  The ROM 11b includes a residual oil amount measuring unit P1, a switch detecting unit P2, a fuel supply port detecting unit P3, a first state transition unit P4, a second state transition unit P5, and a fuel supply determination unit P6 in the claim shown in FIG. In order to cause the CPU 11a to function as various means such as the display control means P7, various programs such as an IGN off monitoring process, an inactive state process, a fueling lid interruption process, and an IGN on process, which will be described later, are stored.

  The meter ECU 10 further includes a storage unit 12, a display unit 13, a transmission / reception unit 14, and an interface unit 15. Each of the storage unit 12, the display unit 13, the transmission / reception unit 14, and the interface unit 15 is electrically connected to the MPU 11.

  As the storage unit 12, an EEPROM or the like that can hold various stored data even when power supply is cut off is used. The storage unit 12 has various storage areas necessary for the processing work of the CPU 11a. The storage unit 12 stores refueling information D1 indicating that refueling is present when the vehicle refueling port changes from the closed state to the open state during the inactive state of the CPU 11a. That is, in the present embodiment, the storage unit 12 functions as a fuel supply information storage unit in the claims shown in FIG. As an example of the refueling information, there is a data structure having data indicating presence / absence of refueling. The determination method with refueling can also be determined based on whether or not refueling information is stored in a predetermined area of the storage unit 12.

  The storage unit 12 stores a forced full display condition D2. The forced full display condition D2 has a certain amount of data that is a threshold for determining whether or not forced full display can be performed. The certain amount of data can be arbitrarily determined by the manufacturer, the vehicle owner, or the like. If the forced full display condition D2 is fixed, it may be stored in the ROM 11b or the like.

  The display part 13 is provided in the instrument panel of a vehicle so that a driver | operator etc. can visually recognize. As is well known, the display unit 13 displays the amount of residual oil requested from the MPU 11 by rotating the pointer with the internal unit and causing the pointer indicating unit and the indicator attached to the dial plate to cooperate with each other. is doing. The display unit 13 sets the indication range of the indication unit to a range from when the fuel in the fuel tank 5 is full (Full) to the amount of residual oil being zero (Empty). It should be noted that the display unit 13 can be of various different embodiments such as using an LCD or the like.

  As the transmission / reception unit 14, a CAN driver / receiver or the like is arbitrarily used. The transmission / reception unit 14 transmits / receives various information to / from the opening sensor ECU 20 and the other ECU 30 via the in-vehicle network 3. And the transmission / reception part 14 outputs the received information to MPU11, and transmits the information instruct | indicated from MPU11 to ECU designated as the transmission destination via the vehicle-mounted network 3. FIG.

  The interface unit 15 is electrically connected to the IGN switch 2 and the fuel sensor 51 described above. The interface unit 15 outputs various signals input from the outside to the MPU 11.

  The interface unit 15 outputs a state signal indicating the on / off state of the electrically connected IGN switch 2 to the MPU 11. Note that the IGN switch 2 is not connected to the interface unit 15 but connected to the in-vehicle network 3 via the other ECU 30, and the state of the IGN switch 2 is transmitted to the meter ECU 10 via the in-vehicle network 3. You can also Note that the IGN switch 2 need not be connected to the interface unit 15 if it can be acquired from the in-vehicle network 3.

  The fuel sensor 51 detects the fuel level in the fuel tank 5 of the vehicle and generates a fuel signal. As is well known, the fuel sensor 51 has a contact that slides on the resistor in accordance with the position of the float that floats on the liquid level in the fuel tank 5, and one end of the resistor is connected to the power source via the resistor. The other end is connected to ground. The contact slides on the resistor according to the level of the fuel in the fuel tank 5, and a voltage obtained by dividing the voltage applied to both ends of the resistor is used as a fuel signal via the interface unit 15. Output to MPU11.

  The above-described CPU 11a executes a residual oil amount measurement program stored in the ROM 11b or the like, so that the fuel signal from the fuel sensor 51 is transmitted via the interface unit 15 at a predetermined sampling interval while the ING switch 2 is on. And the remaining oil amount is calculated based on the fuel signal. By this processing, the CPU 11a functions as the residual oil amount measuring means P1 in the claims.

  Next, the opening sensor ECU 20 detects the state of a fuel filler port (not shown) for the fuel tank 5 of the vehicle. As shown in FIG. 4, the opening sensor ECU 20 includes an MPU 21, a fuel filler sensor 23, a transmission / reception unit 24, and an interface unit 25, which are electrically connected. The MPU 21 includes a CPU 21a, a ROM 21b, a RAM 21c, and the like, similar to the MPU 11 of the meter ECU 10 described above. The fuel filler sensor 23 includes a switch, a sensor, and the like that detect the open / closed state of the lid of the vehicle fuel filler.

  As the transmission / reception unit 24, a CAN driver / receiver or the like is arbitrarily used. The transmission / reception unit 24 transmits / receives various information to / from the meter ECU 10 and the other ECU 30 via the in-vehicle network 3. And the transmission / reception part 24 outputs the received information to MPU21, and transmits the information instruct | indicated from MPU21 to ECU designated as the transmission destination via the vehicle-mounted network 3. FIG. Further, the interface unit 25 outputs an open / close signal indicating the open / close state of the open / close lid detected by the fuel filler sensor 23 to the MPU 21.

  The CPU 21 monitors the open / close state of the opening / closing lid of the fuel filler opening based on the opening / closing signal of the filler opening switch 26. When the CPU 21 detects that the opening lid of the fuel filler opening is opened, the CPU 21 creates fuel filler state information indicating that the opening / closing lid is changed from the closed state to the open state. The CPU 21 requests the transmission / reception unit 24 to transmit the fuel filler state information to the meter ECU 10. The transmission / reception unit 24 transmits the fuel filler state information to the meter ECU 10 via the in-vehicle network 3.

  In the present embodiment, the case where the opening sensor ECU 20 has the fuel filler sensor 23 has been described. However, the present invention is not limited to this, and for example, the fuel filler sensor 23 is an interface of the meter ECU 10 described above. It can also be set as the structure connected to the part 15 directly.

  Next, an example of the ignition (IGN) off monitoring process executed by the CPU 11a of the meter ECU 10 described above will be described below with reference to the flowchart of FIG.

  The CPU 11a determines whether or not the IGN switch 2 is turned off in step S11 (switch detection means) shown in FIG. When determining that the IGN switch 2 is not turned off (N in S11), the CPU 11a repeats this determination process to wait for the IGN switch 2 to be turned off. On the other hand, if the CPU 11a determines that the IGN switch 2 has been turned off (Y in S11), the CPU 11a starts the inactive state process shown in FIG. 6 in step S12, and then ends the process.

  Next, an example of inactive state processing executed by the CPU 11a of the meter ECU 10 described above will be described below with reference to the flowchart of FIG.

  In step S21 shown in FIG. 6, the CPU 11a sets that the fueling lid interrupt such as an external interrupt is permitted in the process of transitioning to the inactive state, and then proceeds to the process of step S22.

  The fueling lid interrupt is generated in response to the transmission / reception unit 14 receiving the fueling port state information. The interrupt request signal input pin and the like of the CPU 11a will be described on the assumption that the fueling lid interrupt is input from the transmission / reception unit 14 when the fueling lid interrupt is permitted. Instead of this, various embodiments can be made such as providing an interrupt controller or the like between the MPU 11 and the transmission / reception unit 14 to interrupt the CPU 11a.

  In step S22 (first state transition means), the CPU 11a changes the state from the active state to the inactive state, and then proceeds to the process of step S23. With this process, the CPU 21a executes the subsequent processes in a low power consumption state.

  In step S23 (switch detection means), the CPU 11a determines whether or not the IGN switch 2 is in an on state via the interface unit 15. If the CPU 11a determines that the IGN switch 2 is not in the ON state (N in S23), the CPU 11a waits for the IGN switch 2 to change to the ON state by repeating this determination process. On the other hand, if the CPU 11a determines that the IGN switch 2 is in the ON state (Y in S23), the CPU 11a proceeds to the process of step S24.

  In step S24 (second state transition means), the CPU 11a changes the state from the inactive state to the active state, and in step S25, sets the refueling cover interrupt to non-permitted, and then proceeds to the processing of step S26. In response to the non-permission setting, the CPU 11a does not accept the fueling lid interrupt. Then, in step S26, the CPU 11a starts the IGN on process shown in FIG. 8, and thereafter ends the process.

  Next, an example of a processing outline when the fueling lid interruption occurs when the CPU 11a of the meter ECU 10 described above is in an inactive state will be described below with reference to a flowchart of FIG.

  When the fueling lid interrupt occurs during the inactive state, the CPU 11a creates the fueling information D1 indicating the presence of fueling described above and stores it in the storage unit 12 in step S31 shown in FIG. 7, and returns to the inactive state. Then, the process ends. When the refueling information D1 is stored by the refueling interrupt processing as described above, the processing is immediately terminated. Therefore, it is possible to prevent wasteful consumption of power when the CPU 11a is in an inactive state.

  Next, an example of the IGN on process that is executed when the IGN switch 2 is turned on when the CPU 11a of the meter ECU 10 is in an inactive state will be described below with reference to the flowchart of FIG.

  In step S41 shown in FIG. 8, the CPU 11a determines the fuel supply determination based on the fuel supply information D1 stored in the storage unit 12. If the CPU 11a determines that the refueling information D1 does not indicate the presence (“NO” in S41), the CPU 11a determines that refueling is not being performed while the IGN switch 2 is OFF, and ends the process. On the other hand, if the CPU 11a determines that the refueling information D1 indicates ON ("Yes" in S41), the CPU 11a determines that refueling is being performed while the IGN switch 2 is OFF, and proceeds to the process of step S42. .

  In step S42, the CPU 11a acquires a combustion signal from the fuel sensor 51 via the interface unit 15, calculates the residual oil amount based on the fuel signal, and then proceeds to the processing of step S43.

  In step S43 (full tank display determining means), the CPU 11a determines whether or not the residual oil amount is equal to or more than a certain amount of data of the forced full tank display condition D2. If the CPU 11a determines that the residual oil amount is not equal to or greater than the predetermined amount data (N in S43), then the process ends. On the other hand, when the CPU 11a determines that the residual oil amount is equal to or greater than the predetermined amount data (Y in S43), the CPU 11a requests the display unit 13 for forced full display in step S44 (display control means), and thereafter performs processing. Exit. The display unit 13 performs full tank display in response to a request for forced full tank display.

  As described above, in the present embodiment, the CPU 11a executes the processes of FIGS. 5, 6, and 8, so that the remaining oil amount measuring means P1, the switch detecting means P2, the filler opening detecting means P3, The CPU 11a functions as the first state transition means P4, the second state transition means P5, the full display determination means P6, and the display control means P7.

  Next, an example of the operation (action) of the meter ECU 10 according to the present invention in the vehicle communication system 1 described above will be described below.

  The meter ECU 10 displays the remaining oil amount calculated based on the fuel signal from the fuel sensor 51 on the display unit 13 while the IGN switch 2 is on. When the vehicle IGN switch 2 is turned off at a gas station or the like, the meter ECU 10 immediately changes the CPU 11a from the active state to the inactive state. When the opening sensor ECU 20 detects that the opening / closing lid of the fuel filler opening of the vehicle is opened while the IGN switch 2 is off, an oil filler lid interrupt is generated in the CPU 11a in response to this detection. The meter ECU 10 stores the refueling information D1 indicating the presence of refueling in the storage unit 12 in response to the occurrence of the refueling cover interrupt.

  Thereafter, the opening lid of the fuel filler opening is closed in response to the end of fueling, and the IGN switch 2 is turned on. When the IGN switch 2 is turned on, the meter ECU 10 determines whether or not there is fuel supply while the IGN switch 2 is turned off, based on whether or not the fuel supply information D1 in the storage unit 12 indicates that there is fuel supply. If the meter ECU 10 determines that there has been refueling while the IGN switch 2 is off, the meter ECU 10 calculates the residual oil amount based on the fuel signal from the fuel sensor 51, and does the residual oil amount satisfy the forced full tank display condition? Judgment of refueling is made. When the meter ECU 10 determines that the residual oil amount satisfies the forced full tank display condition, the meter ECU 10 displays the forced full tank on the display unit 13. Further, when the meta ECU 10 determines that the residual oil amount does not satisfy the forced full tank display condition, the meta ECU 10 displays the residual oil amount on the display unit 13 as usual.

  When the meta ECU 10 determines that there is no fuel supply while the IGN switch 2 is off, the meta ECU 10 calculates the remaining oil amount based on the fuel signal from the fuel sensor 51 and displays the remaining oil amount on the display unit 13. In addition, about the residual oil amount in this case, it can also be set as embodiment which displays the residual oil amount currently displayed when the IGN switch 2 was turned off as it is.

  According to the meter ECU 10 described above, when the opening / closing of the fuel filler opening is detected while the IGN switch 2 is turned off, the fuel supply information D1 indicating the presence of fuel supply is stored in the storage unit 12, and then the IGN switch 2 is turned on. Sometimes, it is possible to determine whether or not refueling is performed while the IGN switch 2 is off based on the refueling information D1. This eliminates the need to measure the amount of residual oil immediately after the IGN switch 2 is turned off as in the prior art, so that the conventional delay time for waiting for the stability of the liquid level in the fuel tank 5 becomes unnecessary, and Since the CPU 11a can be transitioned to the inactive state immediately after the IGN switch 2 is turned off, unnecessary power consumption can be reduced. Further, when the IGN switch 2 is turned on, it is possible to determine whether or not the IGN switch 2 is refueled based on the refueling information D1, and when it is determined that there is refueling, the refueling amount satisfies the forced full display condition. Forced full display is now displayed when Thus, unlike after the IGN switch 2 is turned off, the liquid level in the fuel tank 5 is stable. Therefore, whether or not the forced full tank display is simply performed based on the amount of remaining oil in the fuel tank 5 is determined. Can be determined. Therefore, it is not necessary to detect the amount of oil supply as in the prior art and determine whether or not to perform the forced full tank display based on the oil supply amount, and improve the determination accuracy of the forced full tank display based on the remaining oil amount. Therefore, the accuracy of forced full display can be improved. Therefore, since it is possible to transition to the inactive state immediately after turning off the IGN switch 2 of the vehicle and to display the full tank of the fuel tank 5 accurately, it is possible to realize a display with quick response at the time of refueling. It is possible to realize a residual oil amount display that does not cause a sense of incongruity for drivers and the like. In addition, if the vehicle is a rental car, the accuracy of the determination of whether or not to display a forced full tank can be improved even if the amount of refueling is small, which occurs between the rental car company and the user. It is possible to prevent the trouble of the conventional oil supply.

  In addition, in this embodiment mentioned above, the case where meter ECU10 received the filler opening state information from opening sensor ECU20 via the vehicle-mounted network 3 and the transmission / reception part 14 generate | occur | produced the fueling lid interruption was demonstrated. Instead of this, various different embodiments can be realized such as adding an interrupt generation circuit to the configuration of the meter ECU.

  As described above, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Vehicle Communication System 2 Ignition Switch (IGN Switch)
5 Fuel tank 10 Residual oil amount display device (meter ECU)
12 Refueling information storage means (storage unit)
13 Display means (display unit)
20 opening sensor ECU
23 Opening sensor 51 Fuel sensor P1 Residual oil amount measuring means P2 Switch detecting means P3 Refueling port detecting means P4 First state transition means P5 Second state transition means P6 Full display determination means P7 Display control means

Claims (1)

A residual oil amount measuring means comprising: an inactive state that reduces power consumption; and an active state that transitions from the inactive state and measures a residual oil amount in a fuel tank of a vehicle; and the residual oil amount measuring means, A display means for displaying the measured residual oil amount, and a residual oil amount display device comprising:
Switch detecting means for detecting on / off of an ignition switch of the vehicle;
A fuel filler detecting means for detecting an open / closed state of the fuel filler of the fuel tank;
First state transition means for transitioning the residual oil amount measurement means from an active state to an inactive state when detecting a change from on to off of the ignition switch based on the switch detection means;
Refueling information that stores refueling information indicating that refueling is present when the change of the refueling port from the closed state to the open state is detected based on the refueling port detecting unit during the inactive state of the residual oil amount measuring unit. Storage means;
Second state transition means for transitioning the residual oil amount measurement means from an inactive state to an active state when detecting a change from OFF to ON of the ignition switch based on the switch detection means;
When the second state transition means causes the residual oil amount measuring means to transition from the inactive state to the active state, if the fueling information in the fueling information storage means indicates that there is fueling, the residual oil amount measuring means A full tank display judging means for judging whether or not the measured residual oil amount satisfies a predetermined forced full tank display condition;
Display control means for causing the display means to display a forced full tank display in response to determining that the forced full tank condition of the full tank display determination means is satisfied;
A residual oil amount display device characterized by comprising:

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