JP2013224866A - Control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device capable of calculating a fuel residual quantity corresponding to addition and reduction of sub tanks while suppressing an increase of the number of circuits and the number of processing.SOLUTION: A control section calculates a residual quantity of fuel stored in a first tank from a signal received from a detection section on the basis of a first relational expression N when a first variable resistance and a second variable resistance are not connected, and calculates the residual quantity of fuel stored in the first tank and a second tank from the signal received from the detection section on the basis of a second relational expression Y when the first variable resistance and the second variable resistance are connected.

Description

  The present invention relates to a control device.

  Generally, information relating to the current remaining fuel amount is displayed on a display device installed on the instrument panel of the vehicle. The value of the remaining amount of fuel used for this display is calculated by measuring the liquid level height of the fuel stored in the fuel tank by the liquid level sensor (see, for example, Patent Document 1).

  The liquid level sensor disclosed in Patent Document 1 moves a variable resistor by a float that moves up and down as the fuel in the fuel tank increases and decreases, changes the resistance value of the variable resistor, and sets the received resistance value. Based on this, the value of the remaining amount of fuel is measured.

JP 2003-343379 A

  In order to make it possible to change the fuel storage capacity in the vehicle, in addition to the main tank, which is the first fuel tank, which is mounted in advance, a sub tank, which is the second fuel tank, can be added or removed. There are some that are configured. The display device mounted on such a vehicle needs to be configured to be able to display information on the remaining fuel amount corresponding to both the state where the sub tank is connected and the state where it is not connected.

  For this reason, in the conventional display device, a liquid level sensor is arranged in each of the main tank and the sub tank. Then, the remaining amount of fuel stored in the main tank is calculated based on the resistance value received from the liquid level sensor arranged in the main tank, and based on the resistance value received from the liquid level sensor arranged in the sub tank. The remaining amount of fuel stored in the sub-tank is calculated, and a process of outputting the sum of the remaining amounts of fuel in both tanks as the current remaining fuel value is executed.

  However, such a conventional display device requires two systems of circuits, a main tank circuit and a sub tank circuit. Further, it is necessary to execute a process for calculating the remaining amount of fuel stored in each of the main tank and the sub tank.

  The present invention has been made in view of the above-described circumstances, and provides a control device capable of calculating the remaining amount of fuel in response to the addition and removal of subtanks while suppressing an increase in the number of circuits and the number of processes. The purpose is that.

In order to achieve the above-described object, a control device according to the present invention is characterized by the following (1) to (3).
(1) a control unit;
A first tank and a second tank for storing fuel;
A first variable resistor whose resistance value changes based on the remaining amount of fuel stored in the first tank and a first variable resistor that can be connected in series to the first variable resistor, the second tank A detection unit having a second variable resistance whose resistance value changes based on the remaining amount of fuel stored;
With
When the first variable resistor and the second variable resistor are not connected, the control unit is configured to store the resistance value of the first variable resistor and the first tank stored in the first tank. Based on a first relational expression for associating the remaining amount of fuel, the first remaining amount of fuel is calculated from a signal received from the detection unit, and the first variable resistor and the second variable resistor are Is connected, the value of the combined resistance of the first variable resistor and the second variable resistor and the remaining amount of the second fuel stored in the first tank and the second tank And calculating the remaining amount of the second fuel from the signal received from the detection unit, based on the second relational expression
about.
(2) The control device of (1) above,
A connection determining means for outputting a signal corresponding to a connection state between the first variable resistor and the second variable resistor;
When the control unit receives the first signal from the connection determination unit, the control unit calculates the remaining amount of the first fuel from the signal received from the detection unit based on the first relational expression. When the second signal is received from the connection determination means, the remaining amount of the second fuel is calculated from the signal received from the detection unit based on the second relational expression.
about.
(3) The control device of (2) above,
A display unit for outputting the remaining amount of fuel;
When the control unit receives the first signal from the connection determination unit, the control unit calculates the remaining amount of the first fuel from the signal received from the detection unit based on the first relational expression. When the second signal is received from the connection determination means, the second fuel is calculated from the signal received from the detection unit based on the second relational expression. When the remaining amount is calculated and output to the display unit, and a third signal is received from the connection determination unit, a predetermined value is output to the display unit.
about.

In the control device having the above configuration (1), the first fuel is detected from the signal received from the detection unit based on the first relational expression in accordance with the connection state between the first variable resistor and the second variable resistor. The case where the remaining amount is calculated and the case where the remaining amount of the second fuel is calculated from the signal received from the detection unit based on the second relational expression are switched. That is, when the remaining amount of only the fuel stored in the first tank is calculated according to the connection state between the first variable resistor and the second variable resistor, the first tank and the second tank When the total value of the remaining amount of the fuel stored in is calculated.
In the control device configured as described in (2) above, the remaining amount of the first fuel is calculated from the signal received from the detection unit based on the first relational expression in accordance with the signal output from the connection determination unit. And the case where the remaining amount of the second fuel is calculated from the signal received from the detection unit based on the second relational expression. That is, when the remaining amount of only the fuel stored in the first tank is calculated according to the signal output from the connection determining means, and the remaining amount of fuel stored in the first and second tanks. The case where the total value of the quantities is calculated is switched.
In the control device having the configuration (3), the remaining amount of the first fuel is calculated and displayed from the signal received from the detection unit based on the first relational expression in accordance with the signal output from the connection determination unit. Output to the display unit, the remaining amount of the second fuel calculated from the signal received from the detection unit based on the second relational expression and output to the display unit, and a predetermined value to be output to the display unit And is switched. That is, according to the signal output from the connection determination means, the remaining amount of only the fuel stored in the first tank is calculated and output to the display unit, and the first tank and the second tank The total value of the remaining amount of fuel stored is calculated and output to the display unit, and depends on the remaining amount of fuel stored in the first tank and the remaining amount of fuel stored in the second tank The case where a value to be not output is output to the display unit is switched.

  According to the control device of the present invention, it is possible to provide a control device capable of calculating the remaining amount of fuel in response to the expansion and reduction of subtanks while suppressing the increase in the number of circuits and the number of processes.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a block diagram illustrating a hardware configuration example of the display device according to the present embodiment. FIG. 2 is a flowchart showing a processing routine after the display device according to the present embodiment is activated. FIG. 3 is a flowchart showing a processing routine in the connection state determination processing in the flowchart of FIG. FIG. 4 is a graph showing the relationship between the resistance value and the fuel remaining amount in each of the sub-tank presence state and the sub-tank absence state.

  Specific embodiments relating to a display device realized by including a control device according to the present invention will be described below with reference to the drawings.

The display device 100 according to the present embodiment is mounted and used in a vehicle that uses liquid fuel as a power source. More specifically, the display device 100 is used by being mounted on a vehicle configured to be able to add or remove a sub tank that is a second fuel tank in addition to a main tank that is a first fuel tank. Hereinafter, in this specification, a state in which a sub tank is not connected and only fuel stored in the main tank is used as a power source is referred to as a state without a sub tank, and the sub tank is connected to the main tank and the sub tank. A state in which the stored fuel is used as a power source may be referred to as a sub-tank presence state.
The display device 100 is installed, for example, on an instrument panel of a vehicle, and is used to present information related to the current fuel remaining amount, vehicle speed, engine speed, coolant temperature, and the like to the user.

FIG. 1 is a block diagram illustrating a hardware configuration example of the display device 100 according to the present embodiment.
As shown in FIG. 1, a display device 100 includes a microcomputer (CPU: Central Processing Unit) 101, a speedometer 102, a revolution meter 103, a fuel meter 104, a water temperature meter 105, a motor driver 106, a liquid crystal display panel 107, an illumination. Light emitting unit 108, warning light emitting unit 109, EEPROM (Electrically Erasable Programmable Read Only Memory) 110, power supply circuit 111, interface 112, interface 113, operation switch 114, fuel remaining amount detecting unit 115, and ver terminal 118. Yes. The remaining fuel amount detection unit 115 includes a first sender 116 and a second sender 117. Below, these each structure is demonstrated.

  The microcomputer 101 as a control unit includes a communication function corresponding to a CAN (Controller Area Network) standard, an A / D conversion function, a read-only memory (ROM), and a readable / writable memory (RAM: Random Access Memory). Etc. are built-in. The microcomputer 101 implements various functions necessary for the operation of the display device 100 by executing a program stored in advance on an internal memory (ROM).

  The speedometer 102 includes a pointer that is driven and rotated by an electric motor (not shown) and a speed scale, and by pointing a part of the speed scale with the pointer, the current vehicle speed value is output and presented to the user. It is a measuring instrument.

  The tachometer 103 includes a pointer that rotates by being driven by an electric motor (not shown), and a rotation speed scale. The user indicates the current value of the rotation speed of the engine by pointing a part of the rotation speed scale with the pointer. It is an instrument to present.

  The fuel meter 104 as a display unit includes a pointer that rotates by being driven by an electric motor (not shown) and a fuel scale, and the user indicates the current value of the remaining amount of fuel by pointing a part of the fuel scale with the pointer. It is an instrument to present.

  The water temperature meter 105 includes a pointer that is driven and rotated by an electric motor (not shown) and a water temperature scale, and presents the current value of the temperature of the cooling water to the user by pointing a part of the water temperature scale with the pointer. It is an instrument.

  The motor driver 106 is connected to the microcomputer 101, the speedometer 102, the revolution meter 103, the fuel meter 104, and the water temperature meter 105. The microcomputer 101 outputs control signals to the speedometer 102, the revolution meter 103, the fuel meter 104, and the water temperature meter 105 via the motor driver 106, and controls the positions indicated by the pointers provided in these meters.

A liquid crystal display panel (LCD) 107 includes a number of minute display cells (dots) arranged in a two-dimensional manner capable of individually controlling the display state (lighting / extinguishing, hue, brightness). The liquid crystal display panel 107 can display various display elements in a graphic manner by combining a number of dot displays.

  The illumination light emitting unit 108 is composed of a plurality of light emitting diodes arranged on the back side of the display surface such as the speedometer 102, the revolution meter 103, the fuel meter 104, and the water temperature meter 105. The light emitting diode of the illumination light emitting unit 108 is connected to the output of the microcomputer 101 and the power supply line (VH).

  The warning light emitting unit 109 is composed of a plurality of light emitting diodes individually connected to the output of the microcomputer 101. Each of the plurality of light emitting diodes is disposed on the back side of the corresponding warning display element.

  The read only memory (EEPROM) 110 holds constant data representing various control parameters determined in advance. The read-only memory 110 holds, for example, data representing the first relational expression and the second relational expression that the microcomputer 101 refers to in step S22 of FIG.

  The power supply circuit 111 generates a voltage (Vcc: for example, 5 V) necessary for the operation of the microcomputer 101 based on the power (+ B) supplied from the in-vehicle battery. Further, a reset signal (RESE) for initializing the microcomputer 101 is generated.

  An ignition signal IGN indicating ignition on / off of the vehicle is input to the microcomputer 101 via the interface 112. The signal line CA of the CAN standard communication network on the vehicle is connected to the microcomputer 101 via the interface 113.

  The operation switch 114 connected to the input port of the microcomputer 101 is used for display switching and resetting of the odometer and trip meter.

  The fuel remaining amount detection unit 115 as a detection unit includes a first sender 116 and a second sender 117, and as described below, the connection state of the sub tank and the fuel stored in the main tank and the sub tank. A signal corresponding to the remaining amount is output to the microcomputer 101.

  A first sender 116 as a first variable resistor indicated by a two-dot chain line in FIG. 1 is a variable resistor that constitutes a liquid level sensor. The first sender 116 increases or decreases as the fuel stored in the main tank increases or decreases. The resistance value changes. More specifically, the liquid level sensor includes a float that floats on the fuel stored in the main tank, a movable contact that is connected to the float and that changes its contact position with respect to the variable resistance in accordance with the vertical movement of the float. , And the resistance value of the variable resistor changes according to the position of the movable contact.

  A second sender 117 as a second variable resistor indicated by a two-dot chain line in FIG. 1 is a variable resistor that constitutes a liquid level sensor like the first sender 116, and is stored in the sub tank. The resistance value changes with the increase or decrease of fuel. More specifically, the liquid level sensor includes a float that floats on the fuel stored in the sub-tank, a movable contact that is connected to the float and changes its contact position with respect to the variable resistance in accordance with the vertical movement of the float. And the resistance value of the variable resistor changes according to the position of the movable contact.

  The second sender 117 is configured to be connectable in series to the first sender 116. More specifically, in the absence of the sub-tank, a terminal connected to the sliding piece in the first sender 116 and an A / D conversion terminal in the microcomputer 101 via the wiring S1 indicated by a broken line in FIG. And are connected. In this way, only the first sender 116 is connected to the microcomputer 101. On the other hand, in the state with the sub-tank, the terminal connected to the sliding piece in the first sender 116 and one end of the variable resistor in the second sender 117 are connected via the wiring S2 indicated by a one-dot chain line in FIG. The terminal connected to the sliding piece in the second sender 117 and the terminal for A / D conversion in the microcomputer 101 are connected. Furthermore, the other end of the variable resistor in the second sender 117 is connected to the ground line. In this way, the second sender 117 is connected in series to the first sender 116. Accordingly, the remaining fuel amount detection unit 115 outputs a signal including information on the resistance value of the first sender 116 corresponding to the remaining amount L1 of the first fuel stored in the main tank in the absence of the sub tank. 101. On the other hand, in the state where the sub tank is present, the remaining fuel amount detection unit 115 includes the first sender 116 and the second sender corresponding to the second fuel remaining amount L2, which is the total amount of fuel stored in the main tank and the sub tank. A signal including information on the value of the combined resistance of the sender 117 is output to the microcomputer 101.

  The switching between the state without the sub tank and the state with the sub tank is made by the operator changing the connection between the connectors of the first sender 116 and the second sender 117 in a state where the power of the display device 100 is off. Done.

  The ver (version) terminal 118 serving as a connection determination unit is configured to be grounded by a wiring S3 indicated by a one-dot chain line in FIG. 1, and receives a signal corresponding to the connection state between the first sender 116 and the second sender 117. Output to the microcomputer 101. The ver terminal 118 outputs the Hi signal as the first signal without being connected to the ground by the wiring S3 in the absence of the sub tank where the first sender 116 and the second sender 117 are not connected. On the other hand, the ver terminal 118 is connected to the ground by the wiring S3 and outputs the Lo signal as the second signal in the sub-tank presence state where the first sender 116 and the second sender 117 are connected. When the same output signal is output continuously from the ver terminal 118 output at predetermined time intervals for a predetermined number of times, the microcomputer 101 determines whether the output signal is a Hi signal or a Lo signal. It is determined whether or not there is an output signal. At this time, if the output signal fluctuates and is not stable, the microcomputer 101 considers that the indefinite signal, which is the third signal, is being output from the ver terminal 118 and accepts the output signal. The unstable state of the output signal is when an abnormality occurs in the connection between the first sender 116 and the second sender 117, for example, when a large noise is added to the output signal due to poor contact of terminals, This occurs when the output signal is unstable due to floating lines.

Next, a specific operation of the display device 100 will be described.
FIG. 2 is a flowchart showing a processing routine after the display device 100 according to the present embodiment is activated. FIG. 3 is a flowchart showing a processing routine in the connection state determination processing in the flowchart of FIG.

  First, the driver turns on the ignition switch. The microcomputer 101 supplied with the DC voltage (Vcc) starts processing.

  In step S21, the microcomputer 101 executes a connection state determination process to determine the connection state of the sub tank, that is, the state of the vehicle. More specifically, the microcomputer 101 determines whether the current connection state of the sub-tank is a state without a sub-tank, a state with a sub-tank, or an indeterminate state to be described later by connection state determination processing. Details of the connection state determination process will be described later.

  In step S <b> 22, the microcomputer 101 calculates the remaining fuel amount and outputs the calculated remaining fuel value. More specifically, when the microcomputer 101 determines in step S21 that the current connection state is an indeterminate state, the microcomputer 101 outputs a control signal to the fuel gauge 104 via the motor driver 106, and the fuel gauge 104 Stop the pointer that is provided. Thereafter, the microcomputer 101 executes the process of step S23. That is, if it is determined in step S23 that the current connection state is an indefinite state, the value output at the time of the determination is continuously output to the fuel gauge 104.

  On the other hand, if it is determined in step S21 that the current connection state is a state other than the undefined state, the microcomputer 101 receives a signal output from the fuel remaining amount detection unit 115 and performs A / D conversion, The resistance value R is converted. Thereafter, when the microcomputer 101 determines in step S21 that the current connection state is a state without a sub tank, the microcomputer 101 may be referred to as a relational expression in a state without a subtank (to be described later) (hereinafter referred to as a first relational expression). ) Is used to calculate the value of the remaining fuel amount L displayed on the fuel gauge 104 corresponding to the resistance value R. On the other hand, when the microcomputer 101 determines in step S21 that the current connection state is the sub tank presence state, the microcomputer 101 may be referred to as a relational expression in the subtank presence state (to be described later) (hereinafter referred to as a second relational expression). ) To calculate the value of the remaining fuel amount L corresponding to the resistance value R. After calculating the value of the remaining fuel amount L corresponding to the connection state of the subtank in this way, the microcomputer 101 outputs a control signal to the fuel gauge 104 via the motor driver 106, and the calculated value of the remaining fuel amount L is calculated. Is output to the fuel gauge 104. Thereafter, the microcomputer 101 executes the process of step S23.

  An example of a method for calculating the value of the remaining fuel amount L in step S22 described above will be described with reference to FIG. FIG. 4 is a graph showing the relationship between the resistance value R and the fuel remaining amount L in each of the sub-tank presence state and the sub-tank absence state. That is, it is a graph showing the first relational expression and the second relational expression. The graph shown in FIG. 4 is a graph in which the horizontal axis represents the resistance value R [Ω] and the vertical axis represents the fuel remaining amount L [L]. In FIG. 4, a straight line indicated by a reference sign N indicates a first relational expression, and a straight line indicated by a reference sign Y indicates a second relational expression.

For example, when the microcomputer 101 determines in step S21 that the current connection state is a state without a sub-tank, and the resistance value R is 20Ω, the first relational expression indicated by the symbol N in FIG. The remaining fuel amount L is calculated as 60L (maximum fuel value when there is no sub-tank), and when the resistance value R is 210Ω, the remaining fuel amount L is 30L (intermediate fuel value when there is no sub-tank). When the resistance value R is 400Ω, the remaining fuel amount L is calculated as 0 L (minimum fuel value in the absence of the sub tank). On the other hand, when it is determined in step S21 that the current connection state is the sub-tank presence state, if the resistance value R is 20Ω, based on the second relational expression indicated by symbol Y in FIG. The remaining fuel amount L is calculated as 120L (maximum fuel value in the state with the sub tank), and when the resistance value R is 210Ω, the remaining fuel amount L is calculated as 60L (intermediate fuel value in the state with the sub tank) When the value R is 400Ω, the remaining fuel amount L is calculated as 0 L (minimum fuel value in the state with a sub tank). As described above, the microcomputer 101 calculates the value of the fuel remaining amount L corresponding to the current resistance value R using the relational expression corresponding to the current connection state.
As described above, in the present embodiment, the first sender 116 and the second sender 117 have the resistance value R when the remaining fuel amount L is the maximum fuel value, the intermediate fuel value, and the minimum fuel value. However, it is configured to be equal between the state without the sub tank and the state with the sub tank.

  In step S23, the microcomputer 101 determines whether the ignition switch has been turned off. If it is determined that the ignition switch is turned off as a result of the determination, the microcomputer 101 ends the process. On the other hand, if it is determined that the ignition switch is not turned off as a result of the determination, the microcomputer 101 executes the process of step S22 again. That is, after the display of the value of the remaining fuel amount L is started in step S22, the value of the remaining fuel amount L is continuously output to the fuel gauge 104 until the ignition switch is turned off.

  With the above processing, a predetermined value continues to be output to the fuel gauge 104 depending on whether the current connection state is an indeterminate state, a sub-tank absence state, or a sub-tank presence state. When the first fuel remaining amount L1 is calculated from the signal received from the fuel remaining amount detecting unit 115 based on the relational expression (1) and output to the fuel gauge 104, and based on the second relational expression The case where the remaining amount L2 of the second fuel is calculated from the signal received from the detection unit 115 and is output to the fuel gauge 104 can be switched. That is, depending on the current connection state, a value that does not depend on the remaining amount of fuel stored in the main tank and the remaining amount of fuel stored in the sub-tank is output to the fuel gauge 104 and stored in the main tank. A case where only the remaining amount of fuel is calculated and output to the fuel gauge 104, and a case where the total amount of remaining fuel stored in the main tank and the sub tank is calculated and output to the fuel gauge 104. Can be switched.

Next, details of the connection state determination process will be described with reference to FIG.
In step S31, the microcomputer 101 first receives a signal output from the ver terminal 118. Next, the microcomputer 101 determines whether or not the signal received from the ver terminal 118 is an indefinite signal. If the microcomputer 101 determines that the signal from the ver terminal 118 is an indefinite signal, the microcomputer 101 executes the process of step S32. On the other hand, if it is determined that the signal from the ver terminal 118 is not an indefinite signal, the process of step S33 is executed.

  In step S32, the microcomputer 101 determines that the current connection state is indefinite. Thereafter, the microcomputer 101 executes the process of step S22.

  In step S33, the microcomputer 101 determines whether the signal received from the ver terminal 118 is a Hi signal. If the microcomputer 101 determines that the signal from the ver terminal 118 is a Hi signal, the microcomputer 101 executes the process of step S34. On the other hand, if it is determined that the signal from the ver terminal 118 is not a Hi signal, the process of step S35 is executed.

  In step S34, the microcomputer 101 determines that the current connection state is a state without a sub tank. Thereafter, the microcomputer 101 executes the process of step S22.

  In step S35, the microcomputer 101 determines that the current connection state is a state without a sub tank. Thereafter, the microcomputer 101 executes the process of step S22.

  By the processing in the sub-tank presence / absence determination process, it is determined whether the current connection state is an indefinite state, a sub-tank absence state, or a sub-tank presence state.

  Below, an effect | action and effect of the control apparatus contained in the display apparatus 100 which concern on this embodiment are demonstrated.

The display device 100 according to the present embodiment includes a microcomputer 101, a main tank and a sub tank that store fuel, a first sender 116 that changes its resistance value based on the remaining amount of fuel stored in the main tank, A fuel remaining amount detector 115 having a second sender 117 configured to be connected in series to one sender 116 and having a resistance value that changes based on the remaining amount of fuel stored in the sub tank. When the first sender 116 and the second sender 117 are not connected, the microcomputer 101 determines the resistance value of the first sender 116 and the remaining amount L1 of the first fuel stored in the main tank. Is calculated from the signal received from the fuel remaining amount detection unit 115 based on the first relational expression, and the first sender 116 and the second sensor are calculated. When the motor 117 is connected, a second resistance value corresponding to the value of the combined resistance of the first sender 116 and the second sender 117 and the remaining amount L2 of the second fuel stored in the main tank and the sub tank is associated. Based on the relational expression, the second fuel remaining amount L2 is calculated from the signal received from the fuel remaining amount detecting unit 115.
Thereby, in the display device 100 according to the present embodiment, the signal received from the remaining fuel amount detection unit 115 based on the first relational expression according to the connection state between the first sender 116 and the second sender 117. The first fuel remaining amount L1 is calculated from the first fuel remaining amount L2 from the signal received from the fuel remaining amount detecting unit 115 based on the second relational expression, Is switched. That is, the remaining amount of only the fuel stored in the first tank is calculated according to the connection state between the first sender 116 and the second sender 117, and the first tank and the second tank. When the total value of the remaining amount of the fuel stored in is calculated.
As a result, in the display device 100 according to the present embodiment, the circuit in the fuel remaining amount detection unit 115 is configured by a single system circuit, so that the circuit for the main tank and the sub tank are used as in the conventional display device. It is not necessary to provide two systems of circuits. Further, in the display device 100 according to the present embodiment, the value of the remaining amount of fuel L to be output to the fuel gauge 104 can be calculated by a single calculation process regardless of the connection state of the sub tank. There is no need to execute processing for calculating the remaining amount of fuel stored in each of the main tank and the sub tank. Therefore, according to the display device 100 according to the present embodiment, it is possible to provide a control device capable of calculating the remaining amount of fuel in response to the expansion and reduction of the subtank while suppressing the increase in the number of circuits and the number of processes.

The display device 100 according to the present embodiment further includes a ver terminal 118 that outputs a signal corresponding to the connection state between the first sender 116 and the second sender 117, and the microcomputer 101 transmits the Hi signal to ver. When received from the terminal 118, based on the first relational expression, the first fuel remaining amount L1 is calculated from the signal received from the fuel remaining amount detecting unit 115, and the Lo signal is received from the ver terminal 118. In this case, the remaining amount L2 of the second fuel is calculated from the signal received from the remaining fuel amount detection unit 115 based on the second relational expression.
Thereby, according to the signal output from the ver terminal 118, the first fuel remaining amount L1 is calculated from the signal received from the fuel remaining amount detecting unit 115 based on the first relational expression, and the first The second fuel remaining amount L2 is calculated from the signal received from the fuel remaining amount detecting unit 115 based on the relational expression 2 in FIG. That is, when the remaining amount of only the fuel stored in the first tank is calculated according to the signal output from the ver terminal 118, the remaining amount of fuel stored in the first tank and the second tank is calculated. The case where the total value of the quantities is calculated is switched.
As a result, in the display device 100 according to the present embodiment, the method for calculating the remaining amount of fuel is switched in accordance with the signal from the ver terminal 118. Therefore, when the user adds or subtracts the sub tank, the user can use the microcomputer 101. There is no need to do work to switch the processing method. Thereby, it is possible to prevent the fuel gauge from operating inappropriately due to forgetting to switch the processing method. Therefore, according to the display device 100 according to the present embodiment, it is possible to provide a control device that can calculate the remaining amount of fuel while reliably increasing and decreasing the number of subtanks while suppressing an increase in the number of circuits and the number of processes. .

In addition, the display device 100 according to the present embodiment further includes a fuel gauge 104 that outputs the remaining amount of fuel. When the microcomputer 101 receives a Hi signal from the ver terminal 118, the first relational expression is obtained. Based on the signal received from the fuel remaining amount detection unit 115, the first fuel remaining amount L1 is calculated and output to the fuel gauge 104. When the Lo signal is received from the ver terminal 118, the second relationship is established. Based on the equation, the second fuel remaining amount L2 is calculated from the signal received from the fuel remaining amount detecting unit 115 and output to the fuel gauge 104. When an indefinite signal is received from the ver terminal 118, a predetermined value is obtained. Is output to the fuel gauge 104.
As a result, the first fuel remaining amount L1 is calculated from the signal received from the fuel remaining amount detecting unit 115 based on the first relational expression in accordance with the signal output from the ver terminal 118, and is supplied to the fuel gauge 104. The predetermined value is output when the second fuel remaining amount L2 is calculated from the signal received from the fuel remaining amount detecting unit 115 based on the second relational expression and output to the fuel gauge 104. The case where it is output to the fuel gauge 104 is switched. That is, the remaining amount of only the fuel stored in the first tank is calculated and output to the fuel gauge 104 according to the signal output from the ver terminal 118, and the first tank and the second tank. The total value of the remaining amount of fuel stored in the tank is calculated and output to the fuel meter 104, and the remaining amount of fuel stored in the first tank and the remaining amount of fuel stored in the second tank A value that does not depend on the output is switched to the case where the value is output to the fuel gauge 104.
As a result, in the display device 100 according to the present embodiment, when the signal output from the ver terminal 118 serving as the connection determination unit is indefinite, it is considered that an abnormality has occurred, and the fuel gauge 104 is constant. Output the value. As a result, the user can easily notice that an abnormality has occurred in the connection between the main tank and the sub tank. Therefore, according to the display device 100 according to the present embodiment, a control device capable of calculating and displaying the remaining amount of fuel in a sure manner corresponding to the expansion and reduction of the subtank while suppressing the increase in the number of circuits and the number of processes. Can provide.

  The technical scope of the present invention is not limited to the embodiment described above. The above-described embodiments can be accompanied by various modifications and improvements within the technical scope of the present invention.

  For example, in the display device 100 according to the present embodiment, the display unit 100 is configured to present the value of the fuel remaining amount L to the user using the fuel gauge 104 including a pointer and a fuel scale as the display unit. Any configuration may be used as long as the value of L is presented to the user. For example, the value of the remaining fuel amount L may be presented to the user by graphic display on the liquid crystal display panel 107.

  In the display device 100 according to the present embodiment, the microcomputer 101 converts a signal including information on the resistance value of the first sender 116 or the second sender 117 output from the remaining fuel amount detection unit 115. Although the fuel remaining amount is calculated based on the obtained resistance value R, a signal including information regarding the voltage drop amount by the first sender 116 or the second sender 117 output from the fuel remaining amount detecting unit 115 is provided. The fuel remaining amount may be calculated based on the partial pressure value of each sender obtained by conversion.

  In the display device 100 according to the present embodiment, as shown in FIG. 2, the microcomputer 101 executes the connection state determination process in step S <b> 21 every time the ignition is turned on and the process starts. After executing the connection status determination process, the connection status determination result is stored in the memory as backup data, and the next time the ignition is turned on and the processing is started, whether or not there is an abnormality in the stored backup data If there is no abnormality, the previous determination result is used to calculate and output the remaining fuel amount L. If there is an abnormality, the previous determination result is deleted and the connection state determination process is executed. It is good also as composition to do. This abnormal backup data occurs, for example, when data in the memory is damaged due to a voltage drop or when the connector connection between the first sender 116 and the second sender 117 is changed. According to such a configuration, it is not necessary to execute the connection state determination process every time the ignition is turned on and the process is started, so that the process by the microcomputer 101 can be reduced.

DESCRIPTION OF SYMBOLS 100 Display apparatus 101 Microcomputer 102 Speedometer 103 Revolution meter 104 Fuel meter 105 Water temperature meter 106 Motor driver 107 Liquid crystal display panel 108 Light emission part 109 for illumination Light emission part 110 for warning EEPROM
111 Power Supply Circuit 112 Interface 113 Interface 114 Operation Switch 115 Fuel Remaining Detection Unit 116 First Sender 117 Second Sender 118 Ver Terminal S1 Wiring S2 Wiring S3 Wiring N First Relational Expression Y Second Relational Expression

Claims (3)

A control unit;
A first tank and a second tank for storing fuel;
A first variable resistor whose resistance value changes based on the remaining amount of fuel stored in the first tank and a first variable resistor that can be connected in series to the first variable resistor, the second tank A detection unit having a second variable resistance whose resistance value changes based on the remaining amount of fuel stored;
With
When the first variable resistor and the second variable resistor are not connected, the control unit is configured to store the resistance value of the first variable resistor and the first tank stored in the first tank. Based on a first relational expression for associating the remaining amount of fuel, the first remaining amount of fuel is calculated from a signal received from the detection unit, and the first variable resistor and the second variable resistor are Is connected, the value of the combined resistance of the first variable resistor and the second variable resistor and the remaining amount of the second fuel stored in the first tank and the second tank And calculating the remaining amount of the second fuel from the signal received from the detection unit, based on the second relational expression
A control device characterized by that. A connection determining means for outputting a signal corresponding to a connection state between the first variable resistor and the second variable resistor;
When the control unit receives the first signal from the connection determination unit, the control unit calculates the remaining amount of the first fuel from the signal received from the detection unit based on the first relational expression. When the second signal is received from the connection determination means, the remaining amount of the second fuel is calculated from the signal received from the detection unit based on the second relational expression.
The control device according to claim 1. A display unit for outputting the remaining amount of fuel;
When the control unit receives the first signal from the connection determination unit, the control unit calculates the remaining amount of the first fuel from the signal received from the detection unit based on the first relational expression. When the second signal is received from the connection determination means, the second fuel is calculated from the signal received from the detection unit based on the second relational expression. When the remaining amount is calculated and output to the display unit, and a third signal is received from the connection determination unit, a predetermined value is output to the display unit.
The control device according to claim 2.

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