JP2000283997A - Pointer type display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To move a pointer without a sense of incompatibility from an indicating position of the pointer at the time of no feed of an electric power source to a target deflection angle corresponding to a fuel residual amount, in response to the feed of the power source. SOLUTION: This display is provided with a computing means 331 for computing a moving deflection angle of a pointer in every period based on a target deflection angle and an actual deflection angle of the pointer, and a drive means 6 for driving the pointer based on the moving deflection angle computed by the computing means 331. The computing means 331 has the first computing means 331a for computing the moving deflection angle to make moving amounts in the respective periods equal each other until the actual deflection angle of the pointer comes close to the target deflection angle thereof, and the second computing means 331b for computing the moving deflection angle to make small the moving amounts in the respective periods as the actual deflection angle of the pointer approaches closely from the vicinity of the target deflection angle thereof to the target deflection angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pointer type display device for displaying a measured amount by moving a pointer.

[0002]

2. Description of the Related Art Conventionally, there has been known a pointer type display device which displays a measured amount by moving a pointer. This pointer-type display device is used as a fuel gauge or the like for displaying the remaining amount of fuel in a fuel tank provided on a meter panel of a vehicle.

FIG. 8 is a front view schematically showing a fuel gauge.
In the figure, reference numeral 11 denotes a scale indicating the remaining amount of fuel in the fuel tank,
The scale 11 includes a scale F11a indicating that the fuel in the fuel tank is full (Full), and a scale E11b indicating that the remaining fuel amount is zero (Empty). The pointer 12 is moved by a movement (not shown), so that the scale 1 within the designated range from the scale F11a to the scale E11b.
1 indicates the position of the scale 11 corresponding to the remaining fuel amount.

When the ignition (IGN) switch is turned off, the pointer 12 indicates a position below the scale E11b, which is outside the indicated range, as shown in FIG. Then, when the IGN switch is turned on, the pointer 12 is moved to the position of the scale 11 according to the remaining amount of fuel in the fuel tank.

In such a case, a conventional pointer-type display device (hereinafter, also referred to as a conventional device) is required to move the pointer 12 from the current deflection angle to a target deflection angle corresponding to the measured amount.
According to the angle difference between the target shake angle and the current shake angle, if the angle difference between the two is large, the amount of movement for moving the pointer 12 is increased, and if the angle difference is small, the amount of movement is reduced. The pointer 12 is smoothly moved to the target position.

More specifically, in this conventional apparatus, when a shake angle is given for each shake angle calculation cycle, a calculation process using a weighted average formula is executed for each cycle shorter than the shake angle calculation cycle. The pointer 12 is moved until the next swing angle calculation cycle arrives.

According to the arithmetic processing using the weighted average equation, a large moving angle is calculated when the angle difference between the target shake angle and the current shake angle is large, and when the angle difference is small, that is, the pointer When 12 approaches the target shake angle corresponding to the measured amount, a movement angle having a small value is calculated. Then, according to the moving angle, the pointer 12 moves at a high speed when the angle difference between the target shake angle and the current shake angle is large, and moves at a low speed when the angle difference is small. Thereby, the pointer 12 is smoothly moved.

FIG. 9 is a diagram showing the relationship between the deflection angle of the hands and the time of the conventional pointer-type display device, wherein the vertical axis indicates the deflection angles of the hands 12 and the horizontal axis indicates the time.

In FIG. 9, a curve g _f has a target deflection angle F
Shows the change in the deflection angle of the pointer 12 with respect to the time at the time of
The curve g _e is a pointer 1 with respect to time when the target deflection angle is E.
2 shows a change in the deflection angle, and the stopper indicates the position indicated by the pointer 12 when the IGN switch is off. And
Arrival time T ₁ indicates the time until the pointer 12 reaches the target deflection angle.

Further, S indicates a delay time, and analog data is not read until the voltage is stabilized after the IGN switch is turned on by the delay time S. M indicates a sampling time, and the sampling time M defines an interval for reading analog data. P indicates the average number, and the average number P is set to the simple average number of the sampled A / D data.

Here, a case where the target deflection angle of the pointer 12 according to the remaining fuel amount in the fuel tank is F will be described. I
If after the GN switch is turned ON (S + M × P) ms elapses, as shown in curve g _f, the pointer 12 is moved is started, the pointer based on the deflection angle that is calculated on each cycle by a weighted average formula 12 There is moved, the pointer 12 to the arrival time T ₁
Reaches the target deflection angle. The same applies when the target deflection angle is E, as shown in curve g _e, has been moved so that the target deflection angle E in arrival time T _1.

As described above, in the conventional apparatus, when the IGN switch is turned on, the pointer 12 is moved using the weighted average formula in order to smoothly move the pointer 12 to the target deflection angle corresponding to the remaining fuel amount. I was letting it.

[0013]

However, in the conventional apparatus using the weighted average formula, the moving speed of the pointer 12 is controlled by the fixed display output time.
In order to move the pointer 12 to the target deflection angle corresponding to the remaining amount of fuel, even if the deflection angle is large such as F (see FIG. 9), the deflection angle is changed to E (see FIG. 9). Even when the target deflection angle is small, the time required for the pointer 12 to reach the target deflection angle is the same (the arrival time T ₁ ).
Therefore, when the target deflection angle at which the pointer 12 moves is a small angle, the pointer 12 is moved at a low speed, and when the target deflection angle is a large angle, the pointer 12 is moved at a high speed. The movement speed of the pointer 12 differs depending on the change in the target shake angle, and there is a problem that a sense of incongruity occurs.

Therefore, the present invention has been made in view of the above-described problems,
It is an object of the present invention to provide a pointer-type display device that can move a pointer from a position indicated by the pointer when the power is not turned on to a target deflection angle corresponding to a remaining fuel amount without a sense of incongruity when the power is turned on.

[0015]

According to a first aspect of the present invention, there is provided a pointer-type display device according to the present invention for solving the above-mentioned problems, as shown in a basic configuration diagram of FIG. A pointer-type display device that moves the pointer from the indicated position of the pointer when the pointer is not turned on to the target deflection angle of the pointer according to the measurement amount to be displayed, the target deflection angle and the actual deflection of the pointer. A calculating means 331 for calculating a movement deflection angle of the pointer based on the angle at each cycle; and a driving means 6 for driving the hands based on the movement deflection angle calculated by the calculation means 331; Arithmetic means 33
1 is a first calculating means 331a for calculating the movement deflection angle so that the movement amount in each cycle becomes the same until the actual deflection angle of the pointer approaches the target deflection angle, and And a second calculating means 331b for calculating the moving shake angle such that the moving amount in each cycle becomes smaller as the shake angle approaches the target shake angle from the vicinity of the target shake angle. Features.

According to the pointer type display device of the present invention described above, the driving means 6 operates the first pointer until the actual deflection angle of the pointer becomes close to the target deflection angle when the power is turned on. The pointer is driven so as to have the movement deflection angle calculated by the calculating means 331a. Until the actual deflection angle of the pointer reaches the target deflection angle from the vicinity of the target deflection angle, the driving means 6 drives the pointer so that the movement deflection angle calculated by the second calculation means 331b is obtained. Therefore, when the target deflection angle is small, the target is moved in a short time,
In addition, when the target swing angle is large, the target swing angle is moved in a time corresponding to the swing angle. The problem that the moving speed of the pointer 12 is different due to the change of the distance and the sense of incongruity occurs can be solved.

According to a second aspect of the present invention, there is provided a pointer-type display device according to the first aspect, wherein the calculating means 331 is configured to control the movement of the movable shaker for a predetermined time after the power is turned on. It is characterized in that the angle is set to 0.

According to the pointer type display device of the present invention described in claim 2, since the movement deflection angle is zero for a certain period of time after the power is turned on by the calculating means 331, the movement shake angle is zero during this certain period. The pointer does not move. Therefore, a delay time is provided before the start of the hands, and the movement of the hands with a sense of quality that is relaxed to the driver's appearance can be realized. Furthermore, by synchronizing the start of the hands with the start of the hands of other instruments, such as the octopus, speed, balance, oil pressure, and voltage, by the set time of a fixed time, the start of various instruments has a sense of unity. Can be made.

[0019]

FIG. 2 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS. FIG. 2 is a circuit diagram showing an embodiment in which the pointer type display device according to the present invention is applied to a fuel gauge, and FIG. 3 shows the relationship between the swing angle and time of the pointer to which the present invention is applied. FIG. 4 is a diagram showing various areas in the RAM of the μCOM in FIG. 2, FIG. 5 is a flowchart of the first hand driving process, FIG. 6 is a flowchart of the swing angle updating process, FIG. 7 is an explanatory diagram of a pointer by the pointer-type display device according to the present invention.

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. One end of the resistor 1a is connected to a _Vcc power supply via a resistor 2 and the other end. Are connected to the ground. The contact 1b slides on the resistor 1a in accordance with the level of the fuel in the combustion tank of the vehicle, and outputs a voltage obtained by dividing the voltage applied to both ends of the resistor 1a as an analog fuel signal. It is applied to the input port I ₁ of the microcomputer (μCOM) 3 via the signal line L1 to.

The μCOM 3 converts an analog fuel signal input to the input port I ₁ into a digital signal to obtain 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, and a readable and writable memory (RAM) 34 having a data area for storing various data generated during the processing of the CPU 33 and a work area used for the processing. The μCOM 3 also has a power port V _CC , a ground port GND, an input port I _2, 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 the power supply port V _{CC of the} μCOM 3 via the power supply line L2, and the operating power supply voltage V _CC is supplied. μC
The other end of the grounded resistor 1a is connected to the ground port GND of the OM3 via a ground line L3. the input port I ₂ of μCOM3 the ignition switch 5 of the vehicle is connected.

A cross coil driver 6 is connected to the output port O _{1 of the} μCOM 3. μCOM3 CPU
33 outputs the deflection angle to the cross coil driver 6. The cross coil driver 6 includes a pair of coils 71 and 7 which are wound crossing each other and which the cross coil type instrument has.
A pulse-like drive current according to the wobbling angle of the pointer is passed through the cross coil 7 composed of two.

More specifically, a pulse-like drive current whose duty ratio and current direction change sinusoidally according to the pointer swing angle is applied to one coil 71 of the cross coil 7, and the other coil 72 is cosine-driven. , And the coils 71 and 72 generate magnetic fields orthogonal to each other. As a result, the cross coil 7 generates a combined magnetic field in which the combined magnetic field direction rotates 360 degrees according to the pointer swing angle. 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 12 (hereinafter, refer to FIG. 8) in accordance with the rotation of the rotor magnet, the remaining fuel amount can be displayed by the indicated value of the pointer 12.

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 ₄ according to the program stored in the ROM 32 and performs predetermined processing.
To output the data to ₁ and O _2.

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 subjects the analog fuel signal input to the input port I ₁ to A / D conversion by the A / D converter 31 to obtain a digital fuel signal, and based on the digital fuel signal, the target deflection of the pointer 12. The corner is determined.

Here, an outline of the operation in the above configuration will be described with reference to FIG. In FIG. 3, the vertical axis indicates the deflection angle of the pointer 12, the horizontal axis indicates time, and other basic configurations are the same as those in FIG.

A section A in FIG. 3 shows a waiting time before the movement of the pointer 12, and the swing angle is held at 0. In the section B, the pointer 12 is moved at a constant speed to the vicinity of the target deflection angle.
2 has been moved. In the section C, the pointer 12 is gradually moved from the vicinity of the target shake angle to the target shake angle while decelerating. W indicates a deceleration threshold, and the deceleration threshold W is a reference angle difference for shifting from the section B to the section C.
It is stored in M32. In the present embodiment, the deceleration threshold value W is stored in the ROM 32 in advance, but the present invention is not limited to this. Only the ratio of the deceleration threshold value to the target deflection angle is determined in advance, and the target Various other embodiments, such as calculating a deceleration threshold when the deflection angle is determined, may be adopted.

As shown in FIG. 3, when the target deflection angle according to the remaining fuel amount is the deflection angle M, the pointer 12 is moved at a constant speed in the section B so that the deflection angle of the pointer 12 becomes the deflection angle of the curve G. In the section C, the deflection angle calculated so as to move is decelerated from the deflection angle (MW) obtained by subtracting the deceleration threshold W from the target deflection angle M near the target deflection angle, while gradually decreasing from the target deflection angle to the target deflection angle. the hands 12 computed deflection angle to move is output to the cross coil driver 6 via respective output ports O ₁ to. Then, the cross coil driver 6 causes a pulse-like drive current corresponding to the deflection angle to flow through the cross coil 7, whereby the hands 12 are moved according to the deflection angle. Therefore, as is clear from the above description, the cross coil driver 6 functions as a driving unit in the claims.

Next, referring to FIG. 4, μCOM3 in FIG.
The configuration of the RAM 34 included in will be described.

In FIG. 4, the RAM 34 stores a target deflection angle z corresponding to the remaining fuel amount and a current deflection angle f of the pointer 12.
, A time counter t, an angle difference θ that is a difference between the target shake angle z and the current shake angle f, and a change amount d of the calculated shake angle.
And a work area for storing a remainder r generated by division in the C section and a remainder counter n corresponding to a minor part of the variation d in the C section.

Next, an outline of the processing performed by the CPU 33 shown in FIG.
A description will be given based on the flowchart of the swing angle updating process in FIG.

In FIG. 5, the first hand driving process is performed by IG
When the ON of the N switch is detected, it is called from the upper module. Then, in step S10, RA
By making the initial setting of the work area of M34,
Initial processing is performed, and then the process proceeds to step S11.

In step S11, the input port I ₁
A / D-converts the analog fuel signal to obtain digital fuel data, and a deflection angle corresponding to the remaining fuel amount is calculated based on the digital fuel data.
The target deflection angle is stored in the target deflection angle z of the AM 34, whereby the target deflection angle calculation processing is executed, and then the process proceeds to step S12.

In step S12, the swing angle updating process shown in FIG. 6 is called. Here, the swing angle updating process shown in FIG. 6 will be described.

In step S21, it is determined whether or not the time counter t of the RAM 34 is smaller than an A section threshold value stored in the ROM 32 in advance, thereby determining whether or not the time is in the A section. If it is smaller than the section A threshold, that is, if it is determined that the section is the section A (Y in step S21), the process proceeds to step S22.

In step S22, 0 is stored in the current deflection angle f of the RAM 34, and the flow advances to step S23. Since the movement of the pointer 12 is performed based on the current swing angle f, the pointer 12 can be set to the hold state by storing 0 in the current swing angle f by the process of step S22. Then, in step S23,
The time counter t of the RAM 34 is incremented, and thereafter, the process returns to the first hand driving process.

In step S21, a time counter t
Is greater than or equal to the section A threshold, that is, if it is determined that the section is not the section A (N in step S21), the process proceeds to step S24. Then, in step S24, the difference between the target shake angle z and the current shake angle f in the RAM 34 is stored as the angle difference θ, and the process proceeds to step S25.

In step S25, it is determined whether or not the angle difference d of the RAM 34 is smaller than a deceleration threshold value W stored in the ROM 32 in advance. By this determination processing,
It is determined whether the section is the B section or the C section. Angle difference d is deceleration threshold W
That is, when it is determined that the section is the section B (step S
N at 25), and the process proceeds to step S26.

In step S26, the ROM 32
Is stored in the change amount d in the RAM 34, and the angle increment Δ per unit time in the section B stored in
Go to 31. By this step S26, a constant swing angle is set for the change amount d in the section B.

On the other hand, in step S25, the angle difference d
Is smaller than the deceleration threshold value W, that is, when it is determined that the section is the C section (Y in step S25), the process proceeds to step S27. Then, in step S27, the ROM 32
Is multiplied by the angle difference θ of the RAM 34 in the B section stored in the section B, and the result is a reference angle difference for shifting from the B section to the C section stored in the ROM 32 in advance. The result is divided by the deceleration threshold value W, and the result is stored in the change amount d of the RAM 34, and the remainder of the division is stored in the remainder r of the RAM 34, and the process proceeds to step S28. Note that the processing in step S27 described above can be represented by the following equation (1). (Change d) = (Angle difference θ) × (Angle increment Δ) Δ (Deceleration threshold W) (1)

In step S28, the remainder r is added to the remainder counter n of the RAM 34, and the flow advances to step S29. Then, in step S29, the remainder counter n
Is greater than or equal to the deceleration threshold value W. Remainder counter n
Is smaller than the deceleration threshold value W (N in step S29), the process proceeds to step S31. On the other hand, when it is determined that the remainder counter n is equal to or larger than the deceleration threshold value W (Y in step S29), the process proceeds to step S30.

In step S30, 1 is added to the amount of change d, and the deceleration threshold value W is subtracted from the remainder counter n, so that the remainder is carried forward with respect to the amount of change d. Thereafter, the flow advances to step S31.

As described above, the remainder simultaneously obtained at the time of division is treated as the decimal part of the change amount d. A remainder counter n is prepared, and when a remainder occurs in the division, this remainder is used as a remainder counter n Is added to. Then, 1 in the remainder counter n is equivalent to 1 / deceleration threshold W in the amount of change d (quotient).
Is exceeded, the change amount d (quotient) is incremented by 1 so that the change amount d can be treated as an integer. Therefore, it is possible to prevent the occurrence of underflow before reaching the target deflection angle. Can be prevented.

In step S31, the amount of change d is added to the current shake angle f in the RAM 34, and the flow advances to step S32. Then, in step S32, it is determined whether or not the current swing angle f of the RAM has exceeded the target swing angle z. If it is determined that it has not exceeded (N in step S32), the process returns to the first hand driving process. On the other hand, if it is determined that it has exceeded (Y in step S32), the process proceeds to step S33.

In step S33, the target deflection angle z is stored in the RAM 34 as the current deflection angle f, and thereafter, the process returns to the first pointer driving process. In addition, even if the change amount d exceeding the target shake angle z is calculated directly from the section B by the process of step S33, the target shake angle z is corrected to be the target shake angle z. It can be prevented from exceeding.

When returning from the swing angle updating process,
As shown in FIG. 5, in step S13, the RAM 3
4 is output to the cross coil driver 6 as the deflection angle, the pointer driving process is executed,
Proceed to step S14. The cross coil driver 6 to which the swing angle is input from the CPU 33 causes a pulse-like drive current to flow through the cross coil 7 according to the swing angle, so that the pointer 12 is moved to a position corresponding to the swing angle.

In step S14, it is determined whether the current swing angle f in the RAM 34 is smaller than the target swing angle z. When it is determined that it is equal to or larger than the target shake angle z, that is, when it is determined that the target shake angle z has been reached (step S14).
N) to return to the upper module. On the other hand, when it is determined that it is smaller than the target shake angle z, that is, when it is determined that the target shake angle z has not been reached (Y in step S14), the process proceeds to step S15.

In step S15, the timer T is started based on the timer value T stored in the ROM 32 in advance, so that a timer T start process is executed.
Thereafter, the process proceeds to step S16.

In step S16, it is determined whether or not the timer T has expired, so that a predetermined time (timer value T)
It is determined whether or not it has elapsed. If it is determined that the timer T has not expired (N in step S16), IGN
This determination process is repeated while the switch is on. On the other hand, if it is determined that the timer T has expired (Y in step S16), the process returns to step S12, and the pointer 12
Until step S reaches the target deflection angle z.
A series of processes from 2 to S16 is repeated. Although the timer value T is set to 20 ms in the present embodiment, various settings can be made according to the embodiment.

As is apparent from the above description, since the swing angle updating process shown in FIG. 6 updates the swing angle of the pointer 12, the swing angle updating process functions as a calculating means in the claims. Steps S24 and S26 in the flowchart of FIG.
Since the series of processing in S31 updates the current shake angle f (movement shake angle) so that the change amount d (movement amount) in each cycle becomes the same, it functions as the first calculation means in claims. are doing. Then, step S2 of the flowchart of FIG.
The series of processes in steps S4, S27, and S31 is performed with the change amount d for each cycle.
The present shake angle f (movement shake angle) is updated so that the movement amount in each cycle becomes smaller as the (movement amount) approaches the target shake angle z, and thus functions as the second calculation means in claims. are doing.

Next, an example of the operation (action) of the present embodiment having the above-described configuration will be described with reference to FIG. 3 when the target deflection angle z is M.

In FIG. 3, when (S + M × P) ms elapses after the IGN switch is turned on, the first hand driving process is called, and the target deflection angle z according to the remaining fuel amount is calculated. During the interval A, 0 is stored in the current swing angle f of the RAM 34 by the swing angle update process,
The pointer 12 remains at the position of the stopper. The position of the stopper corresponds to the position indicated by the pointer 12 when the power is not turned on in the claims.

In section A, when a predetermined time elapses, the section shifts to section B. In this section B, the current swing angle f of the RAM 34 is set to R
The angle increment Δ stored in the OM 32 is added, and the pointer 12 is moved according to the angle increment Δ. By repeating this operation periodically until the current shake angle f becomes equal to or larger than the reference angle difference (M−W) determined near the target shake angle z,
The pointer 12 is moved to a position near the target deflection angle Z at a constant speed.

When the current deflection angle f exceeds the reference angle difference, the section C is set. In this section C, in the swing angle update processing, the change amount d calculated by the above equation (1) for calculating the swing angle smaller as the distance approaches the target shake angle z is RA RA
M 34 is added to the current swing angle f, and the pointer 12 is moved according to the calculated change amount d. By repeating this operation periodically until the current shake angle f reaches the target shake angle z, the shake angle gradually increases as the current shake angle f approaches the target shake angle z.

Here, a comparison of the respective operations when the target shake angle z is the maximum and the minimum will be described with reference to FIG.

In FIG. 7, the vertical axis represents the deflection angle of the pointer 12,
The horizontal axis indicates time. Moreover, the curve G _f shows the change in the deflection angle of the pointer 12 with respect to time when the target deflection angle is F, the curve G _e shows the change in the deflection angle of the pointer 12 with respect to time when the target deflection angle is E I have. And
Time T _f is the time to reach the deflection angle F pointer 12 is the target deflection angle, time T _e indicates the time to reach the deflection angle E pointer 12 is the target deflection angle, respectively, the time T ₀ Indicates the starting time of the pointer 12.

[0058] The present invention is applied to a pointer-type display device, in FIG. 7, if the target deflection angle is F, the curve G _f
As shown in the figure, the pointer 12 is started at the time T ₀ and the time T _f
To reach the target deflection angle F. Also, if the target deflection angle is E, similar to the curve G _f, as shown in curve G _e, the start-up hands 12 at time T _0, reaches the E is the target deflection angle at time T _e. As described above, the time required for the pointer 12 to reach the target deflection angle can be set to a time corresponding to the target deflection angle indicating the remaining fuel amount when the IGN switch is turned on.

As described above, in the pointer-type display device according to the present invention, when the target shake angle is small, the pointer is moved in a short time, and when the target shake angle is large, the time corresponding to the shake angle is moved. It is moved by. Therefore, it is possible to solve the problem that the moving speed of the pointer 12 varies due to a change in the target swing angle according to the remaining fuel amount when the IGN switch is turned on, which causes the conventional pointer-type display device to have an uncomfortable feeling. it can.

By the way, in the conventional device, when (S + M × P) ms elapses after the IGN switch is turned on, the pointer 1
Since No. 2 had begun to move, the movement of the pointer 12 was abrupt, and the appearance did not feel high-class. However, by adding the section A as in the present invention, a delay time is provided in the time until the start of the hands 12, and the movement of the hands 12 with a luxurious feeling that is smooth to the driver can be realized. Can be. Further, by synchronizing the start of the start of the pointer 12 with the start of the start of the pointers of other instruments such as the octopus, speed, balance, oil pressure, and voltage by the set time of the section A, a sense of unity in the start of various instruments can be obtained. You can have.

Further, in the above-described embodiment, since the criterion for shifting from the section B to the section C is determined by the deceleration threshold value W, the target deflection angle z which is less than the deceleration threshold value is determined.
Is set, the activation of the pointer 12 may be started from the section C. In this case, if the section B is forcibly provided, the pointer 12 will appear to suddenly decelerate and stop at the target deflection angle z. Therefore, by starting the pointer 12 from the section C, the pointer is smoothly set at the target deflection angle. 12 can be stopped.

Further, for sections B and C in the above-described embodiment, the deflection angle can be calculated using a calculation formula.

For example, since the section B is a section in which the pointer 12 is moved at a constant speed to near the target deflection angle z, the calculation formula in the section B can be expressed by the following equation (2). f = m × (t−t _b ) (2) In the above equation, f is the current deflection angle m is the angle increment Δ in the section B (set value) t is the current time t _b is the time when the transition to the section B is made

Since the section C is a section in which the pointer 12 is gradually moved from the vicinity of the target shake angle z to the target shake angle z while decelerating, the calculation formula in the section C is represented by the following equation (3). be able to. f _n = f _n−1 + (m × (z−f _n−1 )) ÷ c (3) In the above equation, z is the target deflection angle m is the angle increment Δ in section B (set value) c n-th deflection angle in the C section deflection angle f _n when the angular difference f ₀ as a reference the transition to section C is a transition to the section C is (n = 1, 2, ·
···) f _n-1 is the (n-1) th deflection angle in section C

Therefore, the first arithmetic means in the claims executes the arithmetic processing based on the above equation (1) so that the movement deflection angle (change amount d) of the pointer 12 in each cycle becomes the same angle. Can be calculated. Further, the second in the claims
The calculation means executes the calculation processing based on the above equation (2) so that the movement amount becomes smaller as the actual swing angle of the pointer 12 in each cycle approaches from the vicinity of the target shake angle z to the target shake angle z. It is possible to calculate the movement shake angle (change amount d).

[0066]

As described above, according to the pointer-type display device of the present invention, when the target shake angle is small, the pointer is moved in a short time, and when the target shake angle is large, it is moved. Is moved in a time corresponding to the swing angle,
It is possible to solve the problem that the moving speed of the hands differs due to the change in the target swing angle according to the remaining fuel amount when the IGN switch is turned on, which causes the conventional pointer-type display device to have a feeling of strangeness.

According to the pointer-type display device of the present invention described in claim 2, in addition to the effects of the invention described in claim 1,
Since a delay time is provided before the start of the hands, the movement of the hands can be realized with a luxurious feeling that is relaxed to the driver. Furthermore, by synchronizing the start of the hands with the start of the hands of other instruments, such as the octopus, speed, balance, oil pressure, and voltage, by the set time of a fixed time, the start of various instruments has a sense of unity. Can be made.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of a pointer type display device according to the present invention.

FIG. 2 is a circuit diagram showing an embodiment in which the pointer-type display device according to the present invention is applied to a fuel gauge.

FIG. 3 is a diagram showing a relationship between a deflection angle of a pointer to which the present invention is applied and time.

FIG. 4 is a view showing various areas in a RAM included in μCOM in FIG. 2;

FIG. 5 is a flowchart of a first hand driving process.

FIG. 6 is a flowchart of a swing angle update process.

FIG. 7 is an explanatory diagram of a pointer by the pointer-type display device according to the present invention.

FIG. 8 is a front view schematically showing a fuel gauge.

FIG. 9 is a diagram showing the relationship between the deflection angle of a pointer and time in a conventional pointer-type display device.

[Explanation of symbols]

 331 Calculation means (CPU) 331a First calculation means (CPU) 331b Second calculation means (CPU) 6 Driving means (cross coil driver)

Claims (2)

[Claims] 1. A pointer-type display device for moving a pointer from a position indicated by the pointer when the power is not turned on to a target swing angle of the pointer according to a measured amount to be displayed, when the power is turned on. Calculating means for calculating the movement deflection angle of the pointer for each cycle based on the target deflection angle and the actual deflection angle of the pointer; and the pointer based on the movement deflection angle calculated by the calculation means. Driving means for driving the pointer, wherein the calculating means calculates the movement deflection angle so that the movement amount in each cycle is the same until the actual deflection angle of the hands approaches the target deflection angle. 1 calculating means, and second calculating means for calculating the moving shake angle such that the moving amount in each cycle becomes smaller as the actual shake angle of the pointer approaches the target shake angle from the vicinity of the target shake angle. That it has Pointer-type display device featuring. 2. The pointer-type display device according to claim 1, wherein the arithmetic unit sets the movement deflection angle to 0 for a predetermined time after the power is turned on.