JP3107134B2 - Speed distance display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed-distance display device for displaying a speed and a traveling distance of a vehicle or the like based on a pulse supplied from a traveling sensor for generating a pulse at every predetermined traveling distance.

[0002]

2. Description of the Related Art Conventionally, a speed-distance display device for displaying a speed and a traveling distance of a vehicle or the like based on a pulse supplied from a traveling sensor that generates a pulse for each predetermined traveling distance has, for example, the configuration shown in FIG. Have. In the figure, reference numeral 1 denotes a speed display unit for displaying a speed, 2 a distance display unit for functioning as a trip meter for displaying a traveling distance in a section designated by an operator or an odometer for displaying a total traveling distance of the vehicle, 3 Is a control unit composed of a CPU 31, a RAM 32 and a ROM 33, 4 is a non-volatile memory (NVM) provided for holding necessary information when the power of the vehicle or the like is cut off, and 5 is a unit of the vehicle or the like. It is a traveling sensor that outputs a pulse signal every time the vehicle travels a distance.

The traveling sensor 5 is, for example, shown in FIG.
As shown in (b), rotors 51a and 51b configured as disc-shaped members, N-pole magnetized surfaces 511 and S-pole magnetized surfaces 512 formed on the peripheral surfaces of the rotors 51a and 51b, A hall element 52 disposed opposite to the peripheral surfaces of the rotors 51a and 51b, and a pulse generation circuit 5 for generating a pulse signal based on an output from the hall element 52
21. The rotor 51a has four N-pole magnetized surfaces 511 and four S-pole magnetized surfaces 512 on its peripheral surface, and the rotor 51b has N-pole magnetized surfaces 511 and S-polarized magnetized surfaces on its peripheral surface. It has eight each.

[0004] The Hall element 52 includes a rotor 51a.
A positive voltage is induced when the N-pole magnetized surfaces 511 and 51b approach each other. The pulse generation circuit 521 outputs a signal corresponding to the “H” level when the voltage induced from the Hall element 52 is equal to or higher than a preset threshold, and the signal is lower than the threshold. In this case, a signal corresponding to the "L" level is output.

Therefore, as shown in the timing chart of FIG. 12, the configuration shown in FIG. 12A outputs four pulses each time the rotor 51a makes one rotation, and the configuration shown in FIG. 8 pulses are output each time the motor rotates once. In this specification, a running sensor 5 that outputs four pulses each time the rotor makes one rotation as shown in FIG. 12A is used as a running sensor of four pulses, and as shown in FIG. A running sensor that outputs eight pulses is referred to as an eight-pulse running sensor. Although not shown, such a travel sensor 5 has a 16-pulse travel sensor that outputs 16 pulses for each rotation, or 2 for each rotation.
There are various types such as a two-pulse running sensor that outputs a pulse.

[0006] Such a travel sensor 5 is attached to a mechanism such as a drive shaft (not shown) of a transmission that rotates in accordance with the travel distance of the vehicle. The pulse from the travel sensor 5 is input from the PIN terminal of the CPU 31 of the control unit 3 as shown in FIG.
The CPU 31 recognizes the traveling speed of the vehicle based on the frequency of the pulse supplied from the traveling sensor 5 and recognizes the traveling distance of the vehicle based on the number of pulses from the traveling sensor 5. That is, the CPU 31 determines the rising edge of the pulse supplied within the predetermined time (indicated by an upward arrow in the figure)
, Or by measuring the time until the next pulse is supplied, thereby recognizing the traveling speed of the vehicle, and counting the total number of rising edges of the supplied pulse to recognize the traveling distance of the vehicle.

Then, the CPU 31 sends a drive signal to the speed display unit 1 through the output terminals a ₁ , a ₂ , b ₁ , b ₂ based on the recognized traveling speed of the vehicle, and outputs the driving signal to the recognized traveling distance. based sends via the output terminal S ₁ to S _n of the drive signal for the distance display section 2.

As shown in FIG. 6, the speed display section 1 generates a cross coil 11 composed of a _first coil L ₁ and a second coil L ₂ arranged crossing each other, and the cross coil 11 is generated. Magnet rotor 1 arranged in a magnetic field
5, a hand 12 connected to the magnet rotor 15 via the support shaft 14, and a dial 13 on which a speed display scale (hereinafter simply referred to as a scale) 131 is drawn.

[0009] In the thus constructed speed display unit 1, as shown in FIG. 9, the second as well as arranged along the first coil L ₁ of the cross-coil 11 to the line connecting the 0 ° 180 ° of the coil L ₂ arranged along the line connecting the 90 ° 270 °, the current flowing in the first coil L ₁ I _1, when the second current flowing through the coil L ₂ and I _2, of FIG. 10 As shown in the composite vector diagram, the composite vector of the magnetic field generated by the cross coil 11 can be defined by the following equations (1) to (3).

Θ = tan ⁻¹ (I ₁ / I ₂ ) (1) I ₁ = I ₀ · cos θ (2) I ₂ = I ₀ · sin θ (3) , Θ: direction of the resultant vector of the magnetic field I ₁ : current flowing in the first coil L ₁ I ₂ : current flowing in the second coil L ₂ I ₀ : constant

From the above equation, this cross coil 11 is generated.
The vector direction of the resultant magnetic field is the first coil L₁ Electricity
Style I₁ And the second coil L_Two Current I_Two Size of
And the direction of the current. Soshi
The magnet rotor 15 moves in the vector direction of this magnetic field.
The pointer 12 follows the magnet rotor 15
Rotate together. Therefore, in this speed display section 1, the first
Coil L₁ Current I supplied to₁And the second carp
Le L_Two Current I supplied to_Two The size and
The pointer 12 by changing the direction of
It can be positioned at the desired angular position. In this case, the figure
As shown in FIG.₁ And current I_Two Is changed appropriately
With such a configuration, the angle position of the pointer 12 is set to 0 ° to 36 °.
It can be arbitrarily controlled within the range of 0 °. For example, finger
When the needle 12 is positioned at an angle of 30 °, the current I ₁ When
Current I_Two May be -0.85: 0.5.

The CPU 31 recognizes the running speed of the vehicle based on the frequency of the running pulse sent from the running sensor 5, and determines the current I ₁ and the current I ₂ according to the running speed.
To the first coil L ₁ and the second coil L ₂ of the cross coil 11. Thereby, the pointer 12 is positioned at an angular position corresponding to the traveling speed of the vehicle.

The distance display section 2 comprises a display 21 and a driver 22, as shown in FIG. For example, a liquid crystal display, a light emitting diode display, or the like is used as the display 21 and displays information related to the traveling distance, such as a predetermined digit. The driver 22 includes the CPU 3
The display 21 is driven based on the drive signal sent from the control unit 1. Then, the CPU 31 recognizes the travel distance of the vehicle by counting the pulse signals from the travel sensor 5 and sends a drive signal for displaying the recognized travel distance to the driver 22.

As described with reference to FIG. 12, there are a plurality of types of the travel sensor 5 such as a 4-pulse travel sensor, an 8-pulse travel sensor, a 16-pulse travel sensor, and so on. Since such a travel sensor 5 is attached to a mechanism that rotates in accordance with the travel distance of the vehicle, the frequency of the output pulse and the number of pulses per unit time differ depending on the type. For example, assuming that the frequency of a pulse output from a four-pulse travel sensor at a certain speed is 120 Hz, the frequency of a pulse output from an eight-pulse travel sensor at the same speed is twice as high as 240 Hz. Accordingly, the number of pulses per unit time also doubles. Therefore, the CPU 31 needs to change the setting according to the type of the traveling sensor 5 to be used.

As one of the methods of changing the setting, there is a method of dividing the frequency of the pulse signal from the traveling sensor 5. The dividing method, for example, as shown in FIG. 12 (b), in the running sensor 8 pulses, the time _{t 11, t 21, t 31} , ···
Rising edge at (the edge with a circle in the figure)
Is stopped, and rising edges at times t ₁ , t ₂ , t ₃ ,... Are read. In short, in this frequency dividing method, the rising edge of the supplied pulse is read every other pulse. By doing so, the output from the running sensor of eight pulses becomes apparently the same as the output from the running sensor of four pulses, and both signals can be treated as being equivalent.

Similarly, the present invention can be applied to a running sensor of 16 pulses. In this case, after reading the rising edge of the first pulse, reading of the rising edges of the subsequent second, third, and fourth pulses is stopped, and the rising edge of the fifth pulse is read.
The reading of the rising edge of the sixth, seventh, and eighth pulses is stopped, and the rising edge of the ninth pulse is read. In short, this is done by reading the rising edge of the supplied pulse every three pulses. Also in this case, the output from the running sensor of 16 pulses is apparently the same as the output from the running sensor of 4 pulses, and both signals can be treated as the same.

As described with reference to FIG. 6, a scale 131 is drawn on the dial 13 of the speed display unit 1.
Regarding this scale 131, its minimum scale (0 km in the figure)
/ H) and the maximum scale (270 km / h), that is, the swing angle range of the pointer 12 differs depending on the specification.
For example, in one specification, the swing angle range of the pointer 12 from the minimum scale to the maximum scale is 270 °, and in another specification, the swing angle range is 240 °. Also, even if the deflection angle range of the pointer 12 is the same, the display speed at the maximum scale is 270 km / h and 200 km.
/ H in some cases.

In order to cope with such a specification of the speed display section 1, the CPU 31 is configured to be able to select various frequencies per predetermined rotation angle of the hands 12. For example, the predetermined rotation angle is set to 360 °, that is, an angle corresponding to one rotation of the pointer 12, and the frequency of the pulse necessary for rotating the pointer 12 one rotation can be selected. The frequency of the applicable pulse, that is, the allowable input frequency is, for example, in a range of 250 Hz to 100 Hz.

Here, if the specification of the frequency of 250 Hz is selected, when a pulse of 250 Hz is input, the pointer 1
2 means 360 ° rotation. In this specification, when a pulse having a frequency of 6.94 Hz is supplied from the travel sensor 5, the pointer 12 rotates to an angle of 10 °,
When a pulse having a frequency of 13.89 Hz is supplied, the pointer 12
Rotates to an angle of 20 °. And CPU 31
Supplies a drive signal (currents I ₁ , I ₂ ) corresponding to the frequency of the supplied pulse to the cross coil 11 of the speed display unit 1. Similarly, when a frequency of 100 Hz is selected, a pulse having a frequency of 2.78 Hz is supplied and the pointer 1 is displayed.
2 rotates to 10 ° angular position, frequency 5.56Hz
Is supplied, the pointer 12 rotates to an angular position of 20 °.

When performing such control, that is, control in accordance with the type of the travel sensor 5 and the specifications of the speed display unit 1, the CPU 31 refers to the set value held in the NVM 4 and performs control based on the set value. I do. Hereinafter, this NV
M4 will be described. As shown in FIG. 6, the NVM 4 includes a first NVM 41 and a second NVM 42. The first NVM 41 holds information on the traveling distance of the vehicle, information on the type of the traveling sensor 5, a set value of the swing angle of the pointer 12, and the like.
2 stores so-called table information that defines the correspondence between the setting value of the deflection angle of the pointer 12 and the pulse frequency. In the illustrated configuration, two functions are used for each function.
Although described as two NVMs 41 and 42,
One NVM 41 and 42 may be configured by one NVM.

The first NVM 41 is composed of a plurality of data holding areas 410 to 419, for example, as shown in FIG. And among these data holding areas, area 4
Reference numerals 10 to 417 are used as distance data holding areas for holding the traveling distance of the vehicle. That is, when the CPU 31 counts a predetermined number of pulses corresponding to the unit traveling distance, C
The PU 31 stores the integrated travel distance obtained by integrating the unit travel distances in one of the distance data holding areas. For example, the CPU 31 stores the distance data “1” in the area 416.
000 (km) ", the CPU 31 counts the number of pulses corresponding to the unit travel distance" 1 (km) ", and then stores the distance data" 1001 (k) "in the area 417.
m) ”is stored. Further, when the CPU 31 counts the number of pulses corresponding to the unit traveling distance “1 (km)”, the distance data “1002 (km)” is stored in the area 410. In this way, every time the vehicle travels the unit traveling distance, the integrated distance is held in the next region one after another.

When writing the integrated distance in the first NVM 41, the CPU 31 writes the running distance in a distance holding area (not shown) of the RAM 32 every "0.1 (km)" running. Then, when the integrated traveling distance held in the distance holding area is raised to the order of 1.0 km, the CPU 31 writes the distance data in the target area of the NVM 41.

The area 418 is used as a sensor pulse rate holding area for holding information on the type of the traveling sensor 5. For example, when the value “0” is held in the area 418, the CPU 31 determines that the traveling sensor is the four-pulse running sensor described above. Similarly, when the hold value is “1”, the running sensor is determined to be an 8-pulse sensor.
It is determined that the traveling sensor has six pulses. And CPU 31
Refers to the held value in this area 418. If the held value is “0”, the frequency division ratio of the pulse supplied from the traveling sensor 5 is set to 1/1, and if the held value is “1”, Sets the frequency division ratio to 1/2, and when the held value is "3", sets the frequency division ratio to 1/4. Here, when the frequency division ratio is set to 1/1, the frequency division for the pulse is not performed. When the division ratio is set to １ ／, as described with reference to FIG. 12B, the division operation is performed every other pulse, and when the division ratio is set to に. Performs a frequency division operation every three pulses.

An area 419 is used as a swing angle setting holding area for holding information on the setting of the swing angle of the pointer 12. The area 419 holds values “0” to “A” in hexadecimal, for example. This value is
1 is used to refer to the contents of the table information held in the second NVM 42. In the illustrated configuration, the swing angle set value is stored in the second NVM 42, but the set value is stored in the ROM of the control unit 3.
33.

The second NVM 42 comprises a plurality of data holding areas 420 to 429, for example, as shown in FIG. Each of these areas is divided into upper areas 420a to 429a and lower areas 420b to 429b. Then, the upper side areas 420a to 420a-4
The swing angle setting value is held in the lower area 420a.
Input frequencies corresponding to the swing angle setting values are held in b to 429b. The input frequency is an input frequency from the reference travel sensor 5, for example, the reference travel sensor is a 4-pulse travel sensor, and the input frequency of the 4-pulse travel sensor is held. The respective areas 420 to 429 of the second NVM 42 hold, for example, the following information. That is, the value “0” is stored in hexadecimal notation in the upper region 420a of the region 420, and the corresponding frequency “250 (Hz)” is stored in the lower region 420b. Then, the frequency gradually lowered for each predetermined frequency is held, and the area 4
The value “8” is stored in hexadecimal notation in the upper region 427a of the 27 and the corresponding frequency “130 (Hz)” is stored in the lower region 420b. Similarly area 4
The value “A” is stored in hexadecimal notation in the upper region 429a of 29, and the corresponding frequency “100 (Hz)” is stored in the lower region 429b.

[0026]

In the conventional speed-distance display device described above, when the specification of the speed display unit 1 is extended, for example, a frequency for newly rotating the pointer 12 by one revolution is 260 Hz (however, , Four-pulse running sensor) may be added.

In this case, there is a method of adding the specification of the frequency 260 Hz to the table data held in the NVM 42. In this method, it is necessary to update the table data every time the specification increases, and to change the program. However, there is a problem that it takes time and effort.

By using a mechanism for setting the type of sensor, it is possible to cope with the addition of this specification. For example, with the above-described four-pulse travel sensor,
In the case of the specification of 60 Hz, by storing the value “1” in the area 418, the pulse supplied from the traveling sensor 5 is regarded as an eight pulse from the traveling sensor. Thus, as described with reference to FIG. 12, the CPU 31 executes a 1/2 frequency dividing operation for capturing every other pulse. As a result, the frequency of this pulse becomes the second NVM 42
Is equivalent to the 130 Hz specification frequency of the reference travel sensor (four-pulse travel sensor) held as the reference.
Therefore, by using the 130 Hz information held in the area 427 of the second NVM 42, the 260 Hz
Can be supported. However, when such a 1/2 frequency dividing operation is performed, the 1/2 frequency dividing operation is also performed on the pulse supplied to the distance display unit 2 and the number of pulses is reduced. There is a problem that the distance recognized by No. 2 is reduced by half.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a speed-distance display device which can easily expand the specification of the speed display unit 1 when the specification is expanded. And

[0030]

A speed and distance display device according to the present invention for solving the above problems will be described with reference to FIG. FIG. 1 is a basic configuration diagram of a speed-distance display device according to the present invention. That is, the speed-distance display device of the present invention has a pointer 12 and a drive unit for driving the pointer 12 to rotate. The speed display unit 1 displays information on the speed of the vehicle by the pointer 12; A speed-distance display device having distance display means 2 for displaying information relating to a distance, wherein deflection angle information defining a relationship between a frequency of a pulse signal output from a reference travel sensor and a deflection angle of the pointer 12 is provided. A plurality of swing angle tables 42 in a predetermined frequency range, a selection information holding unit 419 holding selection information for selecting one of the plurality of swing angle information held in the swing angle table 42, A traveling sensor 5 that outputs a pulse signal for each unit traveling distance, and a pulse signal from the traveling sensor 5 is treated as a pulse signal from the reference traveling sensor. Frequency variable information and variable frequency information holding means 418 for holding the variable frequency output unit 31a for varying output on the basis of the frequency of the pulse signal to said frequency variable information from the running sensor 5
Drive signal generation means for generating a drive signal from the frequency of the pulse signal output from the frequency variable output means 31a and the deflection angle information designated based on the selection information held in the selection information holding means 419 31d, and
The speed display means 1 is driven based on the drive signal generated by the drive signal generation means 31d, and information on the mileage of the vehicle is calculated based on the number of pulse signals supplied from the frequency variable output means 31a. In a speed-distance display device for displaying distance information by the distance display means 2, the frequency variable information holding means 418 includes first frequency variable information holding means 418a for holding first frequency variable information related to the speed display means 1. A second frequency variable information holding the second frequency variable information related to the distance display means 2.
Frequency variable information holding means 418b, and the frequency variable output means 31a varies the frequency of the pulse signal from the traveling sensor 5 based on the first frequency variable information, and sends the pulse signal to the drive signal supply means 31d. First frequency variable output means 31b for outputting, and second frequency variable output means 31c for varying the frequency of the pulse signal from the travel sensor 5 based on the second frequency variable information and outputting to the distance display means 2 And characterized in that:

When the frequency of the pulse signal defined by the specifications of the travel sensor 5 is higher than the frequency range of the deflection angle table 42,
The pulse signal supplied from the travel sensor 5 is divided so as to fall within the frequency range.

When the frequency of the pulse signal defined by the specifications of the travel sensor 5 is lower than the frequency range of the deflection angle table 42,
The pulse signal supplied from the travel sensor 5 is multiplied to be within the frequency range.

[0033]

In the above construction, the first frequency varying means 31b
Varies the frequency of the pulse supplied from the traveling sensor 5 based on the first frequency variable information on the speed display means 1 held in the first frequency variable information holding means 418a,
The second frequency variable means 31c varies the frequency of the pulse supplied from the travel sensor 5 based on the second frequency variable information on the distance display means 2 held in the second frequency variable information holding means 418b. That is, the speed display means 1
And the frequency of the pulse related to the distance display means 2 are set independently, so that when a specification outside the range defined by the swing angle table 42 is added, the speed display means 1 By modulating the frequency of the pulse supplied from the traveling sensor 5 to a frequency within a specified range, a regular speed can be displayed. The distance display means 2 supplies a regular pulse by supplying a pulse corresponding to the traveling distance. The mileage can be displayed. Further, regarding the setting operation of this specification, the first frequency variable information held in the first frequency variable information holding unit 418a and the second frequency variable information holding unit 418b
Since it is only necessary to rewrite the second frequency variable information stored in the storage unit and the selection information stored in the selection information storage unit 419 in accordance with the specification to be added, the configuration can be simplified.

When the output frequency of the traveling sensor 5 exceeds the allowable input range of the speed display unit 1, the first frequency variable output means 31b divides this pulse signal to a frequency within the allowable input range. Since the modulation is performed, the processing can be facilitated.

When the output frequency of the travel sensor 5 is less than the allowable input range of the speed display unit 1, the first frequency variable output means 31b doubles the pulse signal output by the travel sensor 5 to allow Since the modulation is performed to the frequency in the input range, the processing can be facilitated.

[0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a speed / distance display device according to the present invention. The configuration of the speed-distance display device of the present invention is almost the same as the conventional device described with reference to FIG.
41 is different.

First, the configuration of the first NVM 41 will be described. The first NVM 41 includes a plurality of regions 410 to 419 as shown in FIG. Of these areas, the areas 410 to 417 are used as distance data holding areas for holding the traveling distance of the vehicle as in the related art.

The area 418 is used as a sensor pulse rate holding area for holding information on the type of the traveling sensor 5. The area 418 is divided into an upper area 418a and a lower area 418b. The upper area 418a holds information on the type of the traveling sensor 5 for the speed display unit 1, and the lower area 418b Information on the type of the travel sensor 5 for the distance display unit 2 is held. In these areas 418a and 418b, information similar to the conventional one, that is, the value “0”,
"1" and "3" are held, and the hold value "0" recognizes the 4-pulse travel sensor, the hold value "1" recognizes the 8-pulse travel sensor, and the hold value "3" recognizes the 16-pulse travel sensor. doing.

In the area 419, as in the prior art, the pointer 12
Is stored as values “0” to “A” in hexadecimal, for example. This value is also handled in the same manner as in the related art, and is used by the CPU 31 to refer to the contents of the table information held in the second NVM 42.

With the change of the NVM 41, as shown in FIG. 2B, an area 32 for holding a prescribed value for frequency division (count upper limit value) in the RAM 32 of the control unit 3.
a, an area 32b for holding a prescribed value for distance division, an area 32c acting as a counter for speed division, and an area 32d acting as a counter for distance division are provided. The RAM 32 is provided with an area 32e acting as a counter for speed calculation, an area 32f acting as a counter for distance calculation, and a starting data holding area 32g for holding starting data for section traveling distance. ing. Further, the RAM 32 is provided with a distance holding area (not shown), and holds the above-described integrated traveling distance.

The control unit 3 of the embodiment having the above configuration is
The operation shown in the flowchart of FIG.
The display of the speed of the vehicle and the display of the traveling distance are performed based on the pulse supplied from the vehicle. The operation of the control unit 3 will be described. In describing this operation, here, the type of the traveling sensor 5 is 3 pulses of 4 pulses, 8 pulses, and 16 pulses.
The case where the frequency is a kind and a higher frequency is added to the frequency specified by the specification of the speed display unit 1, such as 260 Hz, will be described.

In this operation, first, at step S31
Perform initial setting with 0. The initial setting operation in step S310 is specifically performed according to the flowchart of FIG.

First, a set value is read in step S410. In this step S410, the pulse rate for the speed display unit 1 held in the area 418a of the NVM 41, that is, information on the type of the travel sensor 5, and the pulse rate for the distance display unit 2 stored in the area 418b, that is, the pulse rate of the travel sensor 5 are stored. Information about the type is read.

Then, the following steps S420 to S
At 424, the specified value (count upper limit value) of the speed frequency dividing counter set corresponding to the pulse rate of the speed display unit 1 is stored in the area 32 a of the RAM 32.

First, in step S420, whether the speed pulse rate (the value held in the area 418a) used in the speed display unit 1 read in step S410 indicates a 4-pulse running sensor (value "0"). Is determined.
If it is a four-pulse running sensor, the specified value “0” corresponding to the division ratio 1/1 is determined in step S421.
Is stored in the area 32a of the RAM 32.

If it is determined in step S420 that the running pulse rate is a running sensor with a pulse rate other than 4 pulses, the flow shifts to step S422. And this step S422
In, it is determined whether or not the speed pulse rate is an 8-pulse running sensor (value “1”). If it is an 8-pulse running sensor, the specified value “1” corresponding to the dividing ratio １ ／ is stored in the area 32 a of the RAM 32 in step S 423.

If it is determined in step S422 that the speed pulse rate indicates a travel sensor other than 8 pulses, the flow shifts to step S424, and the travel sensor has a speed pulse rate of 16 pulses (value "3"). The specified value “3” corresponding to the division ratio １ ／ is stored in the RAM 32
In the area 32a.

Thus, the count value corresponding to the speed pulse rate used in the speed display section 1 is stored in the RAM 3.
After storage in the area 32a of step S2, the subsequent steps S430 to S430
In step S434, the specified value of the distance dividing counter set corresponding to the distance pulse rate used in the distance display unit 2 is stored in the area 32b of the RAM 32. This operation is performed in the same procedure as the above-described operation of storing the count value of the speed display unit 1 (steps S420 to S424).

That is, in step S430, it is determined whether or not the distance pulse rate (the value held in the area 418b) read in step S410 indicates a four-pulse running sensor (value "0"). In step S431, the specified value “0” corresponding to the division ratio 1/1 is stored in the area 32b of the RAM 32 in step S431.

In step S432, it is determined whether or not the pulse rate for distance is a running sensor of 8 pulses (value "1").
At 423, the specified value “1” corresponding to the dividing ratio １ ／ is set to RA.
It is stored in the area 32b of M32.

In step S434, assuming that the distance pulse rate indicates a running sensor (value "3") of 16 pulses, a specified value "3" corresponding to the frequency division ratio of 1/4 is stored in the RAM 3.
2 is stored in the area 32b.

By executing each of the above steps, the RAM 32
Specified value (count upper limit value) corresponding to pulse rate (type of sensor) for speed display unit 1 and distance display unit 2
Is stored, and the initial setting operation in step S310 ends.

As an example of the initial setting operation, a configuration in which the pulse rate is sequentially determined as in step S420 or step S422 has been described. However, a value indicating the pulse rate (the area 418 of the NVM 41) Hold value) and the corresponding count value (RAM3
The values read from the NVM 41 may be directly stored in the RAM 32. With this configuration, the steps required for the determination can be omitted,
Processing can be sped up.

When this initial setting is completed, the process proceeds to steps S320 to S320 in the flowchart of FIG.
Move to 340. In step S320, the speed display unit 1
The calculation of the speed information displayed by is performed. The operation of calculating the speed information is performed by the number of speed calculation pulses within a predetermined period, that is, the speed calculation pulse counter area 32e of the RAM 32 during the time period measured by a timer (not shown).
This is performed by acquiring the count value of. Alternatively, measuring the input frequency of the pulse input to the pulse counter area 32e for speed calculation, that is, starting from the point in time when the counter area 32e is counted up by supplying a certain pulse, This is performed by measuring the elapsed time until counting up by inputting a pulse using a micropulse having a high frequency or the like.

In step S330, the total traveling distance of the vehicle is obtained. The operation of acquiring the total traveling distance is performed by the distance data holding areas 410 to 4 of the NVM 41 described with reference to FIG.
This is performed by acquiring the maximum value of the traveling distance data from the traveling distance data stored in the memory 17. Note that the operation of acquiring the total traveling distance may be performed based on traveling distance data held in a distance holding area (not shown) of the RAM 32. In step S340, the section travel distance is calculated. In this section traveling distance calculation operation, the starting point data held in the starting point data holding area 32g of the RAM 32 is subtracted from the total traveling distance data held in the distance holding area (not shown) of the RAM 32. Will be

By executing these steps S320 to S340, the speed information displayed by the speed display unit 1, the total mileage information and the section mileage information displayed by the distance display unit 2 are obtained, and in subsequent step S350, , Ie, speed information, total mileage information, and section mileage information.

In step S350, the CPU
31 is a drive signal, that is, a current I according to the speed information.
₁ and a current I ₂ are generated and supplied to the first coil L ₁ and the second coil L ₂ (see FIG. 6) of the respective speed display units 1. Further, the CPU 31 appropriately selects the total mileage information and the section mileage information according to the operation of the driver or the like, and sends the selected mileage information to the driver 22 of the distance display unit 2. And the driver 22
The display 21 is operated according to the supplied traveling distance information. Further, after each of the information is displayed in step S350, the process returns to step S320 to acquire new information.

By the way, in the operation of the flowchart of FIG. 3, it is necessary to appropriately update the above information. This information updating process is specifically executed according to the flowchart of FIG. This updating process is performed by an interrupt process while the operation of the flowchart of FIG. 3 is being performed, and more specifically, is performed at the timing of each falling edge (downward arrow) shown in the timing chart of FIG. Hereinafter, this updating process will be described.

First, in step S510, the count value of the speed dividing counter held in the area 32c of the RAM 32 is compared with the prescribed value of the speed dividing counter held in the area 32a of the RAM 32. If it is determined that the values do not match, the count value of the speed dividing counter (the value of the area 32c) is incremented by one in step S511.

On the other hand, if it is determined in step S510 that the values match, that is, if the count value of the speed dividing counter has reached the specified value, then in step S512 the count value of the speed dividing counter is determined. Is cleared to the value “0”. Then, in a succeeding step S513, the CPU
Numeral 31 captures the pulse supplied from the traveling sensor 5 and increments the count value of the speed calculation counter (the area 32e of the RAM 32) by one.

That is, in steps S510 to S513, the count value of the speed calculation counter (area 32e) is incremented by one each time the count value of the speed frequency division counter (area 32c) reaches a specified value.

Then, control goes to a step S520. In this step S520, the count value of the distance dividing counter held in the area 32d of the RAM 32 and the RAM 32
Is compared with the specified value of the distance dividing counter held in the area 32b. If it is determined that the values do not match, the count value of the distance dividing counter (the value of the area 32d) is incremented by one in step S521.

On the other hand, if it is determined in step S520 that the values match, that is, if the count value of the distance dividing counter has reached a specified value, then in step S522, the count value of the distance dividing counter is determined. Is cleared to the value “0”. Then, in a succeeding step S523, the CPU
Numeral 31 captures the pulse supplied from the traveling sensor 5 and increments the count value of the distance calculation counter (the area 32f of the RAM 32) by one.

That is, in steps S520 to S523, the count value of the distance calculation counter (area 32f) is incremented by one each time the count value of the distance frequency dividing counter (area 32d) reaches a specified value.

The series of processes described above, that is, the speed / distance information acquisition / display process (FIG. 3) and the initial setting process (FIG. 4)
By executing the information update process (FIG. 5), the speed / distance display device displays the speed and the travel distance of the vehicle by the pulse supplied from the travel sensor 5.

As is clear from the above description,
The basic configuration of the present invention described in FIG. 1 and this embodiment have the following correspondence. That is, the speed display means 1 corresponds to the speed display section 1 in the embodiment, and the distance display means 2
Corresponds to the distance display unit 2 in the embodiment device. The frequency variable information holding unit 418 is the first N in the embodiment.
The first frequency variable information holding unit 418a corresponds to the region 418 of the VM 41, and the second frequency variable information holding unit 41 corresponds to the region 418a of the first NVM 41 in the embodiment.
8b is a region 418b of the first NVM 41 in the embodiment.
It corresponds to. The selection information holding unit 419 corresponds to the area 419 of the NVM 41 in the embodiment, the swing angle table 42 corresponds to the second NVM 42 in the embodiment, and the travel sensor 5 corresponds to the travel sensor 5 in the embodiment. Further, the variable frequency output means 31a corresponds to the above steps S510 to S523, the first variable frequency output means 31b corresponds to the above steps S510 to S513, and the second variable frequency output means 31c corresponds to the above steps S520 to S520.
In step S523, the drive signal generation unit 31d corresponds to step S350.

In this embodiment, when a new specification of the 4-pulse sensor 260 Hz is added to the speed-distance display device whose upper limit of the specification is the 4-pulse sensor 250 Hz, the speed pulse of the NVM 41 is added. The value “1” indicating the 8-pulse sensor is held in the holding area 418 a of the late and the holding area 41 of the pulse rate for distance is held.
8b holds the value “0” indicating the 4-pulse sensor.

The speed display section 1 divides the pulse supplied from the travel sensor 5 by １ ／ and divides the pulse by ４ into a 4-pulse sensor 13.
Since the pulse signal is treated as a pulse signal of 0 Hz specification, an accurate speed can be displayed. On the other hand, the distance display unit 2 does not divide the pulse supplied from the travel sensor 5 but treats it as a pulse supplied from the four-pulse sensor.
The regular mileage can be displayed.

When a new specification of an 8-pulse sensor 600 Hz is added to a speed-distance display device whose upper limit of the specification is a 4-pulse sensor 150 Hz, a 16-pulse sensor is shown in the area 418a of the NVM 41. The value “3” is held and the value “1” indicating the 8-pulse sensor is held in the area 418b. As a result, the speed display unit 1 divides the pulse supplied from the traveling sensor 5 by １ ／ and treats it as a pulse signal of the 4-pulse sensor 150 Hz specification. Since it is handled as being supplied from the eight-pulse sensor, it is possible to display a normal speed and a traveling distance.

By the way, in the above description, the case where the specification of the frequency higher than the upper limit specified by the specification is added. On the contrary, the specification of the frequency lower than the lower limit specified by the specification is changed. May be added. This case can be dealt with by substantially the same processing as the above-described embodiment.

For example, when a new specification of a 4-pulse sensor 80 Hz is added to a speed-distance display device whose lower limit of the specification is a 4-pulse sensor 100 Hz, the pulse supplied from the traveling sensor 5 is multiplied. That is, the pulse whose frequency is doubled is used as the pulse for the speed display unit 1. At this time, the pulse from the travel sensor 5 is supplied to the distance display unit 2 as it is. This gives C
The PU 31 treats this pulse as a pulse of the 8-pulse sensor 160 Hz, so that the 4-pulse sensor 80 Hz
Therefore, the normal speed display by the speed display unit 1 can be performed.

As described above, in the embodiment described above, the NVM4
Since it is only necessary to rewrite the content held in No. 1, it is possible to significantly reduce the labor required for adding specifications.

[0073]

As described above, according to the speed / distance display device of the present invention, the first variable frequency output means increases or decreases the frequency of the pulse signal supplied to the drive signal generating means, and the second variable frequency output means. Since the output means increases or decreases the frequency of the pulse signal supplied to the distance display means, the frequency of the pulse signal to the speed display means and the frequency of the pulse signal to the distance display means are set to different frequencies. Thus, a new specification can be added by changing the frequency of the pulse signal for the speed display means and the frequency of the pulse signal for the distance display means.

When the output frequency of the traveling sensor 5 exceeds the allowable input range of the speed display unit 1, the first frequency variable means 31b divides the frequency of the pulse signal to modulate the pulse signal into a frequency within the allowable input range. Therefore, the processing can be facilitated.

When the output frequency of the travel sensor 5 is less than the allowable input range of the speed display unit 1, the first frequency variable means 31b multiplies the pulse signal output by the travel sensor 5 to permit input. Modulates to a range of frequencies,
The processing can be facilitated.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 shows a first NVM 41 and a RAM 3 in the embodiment.
FIG. 2 is a diagram for explaining the configuration of FIG.

FIG. 3 is a flowchart illustrating processing for acquiring and displaying speed and distance information according to the embodiment.

FIG. 4 is a flowchart illustrating an initial setting process in the embodiment.

FIG. 5 is a flowchart illustrating an information updating process according to the embodiment.

FIG. 6 is a diagram illustrating an example and a conventional device configuration.

FIG. 7 is a diagram illustrating a configuration of a conventional first NVM 41.

FIG. 8 is a diagram illustrating a configuration of a second NVM.

FIG. 9 is a diagram illustrating a configuration of a speed display unit 1.

FIG. 10 is a diagram for explaining a drive signal for the speed display unit 1.

FIG. 11 is a diagram illustrating a drive signal for the speed display unit 1.

FIG. 12 is a diagram illustrating a travel sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speed display part (speed display means) 11 Cross coil 12 Pointer 2 Distance display part (distance display means) 21 Display 22 Driver 3 Control part 31 CPU 32 RAM 4 Non-volatile memory (NVM) 5 Traveling sensor

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁷ , DB name) G01P 1/08 G01C 22/00 G01D 13/22 101 G01P 3/487

Claims (3)

(57) [Claims] A speed indicator for displaying information on a speed of a vehicle by the hands, and a distance display for displaying information on a traveling distance of the vehicle. A speed-distance display device having: a plurality of run-out angles within a predetermined frequency range, the run-out angle information defining a relationship between the frequency of a pulse signal output from a reference travel sensor and the run-out angle of the pointer. An angle table, and one of a plurality of pieces of deflection angle information held in the deflection angle table.
Selection information holding means in which selection information for selecting one is held; a traveling sensor that outputs a pulse signal for each unit traveling distance; and a pulse signal from the traveling sensor treated as a pulse signal from the reference traveling sensor. Frequency variable information holding means for holding frequency variable information, frequency variable output means for varying and outputting the frequency of the pulse signal from the travel sensor based on the frequency variable information, and output from the frequency variable output means. And a drive signal generating means for generating a drive signal from the frequency of the pulse signal and the deflection angle information designated based on the selection information held in the selection information holding means. The speed display means is driven based on the drive signal thus generated, and the running of the vehicle is controlled based on the number of pulse signals supplied from the frequency variable output means. In a speed-distance display device that calculates information related to a distance and displays distance information by the distance display unit, the frequency variable information holding unit includes a first frequency variable that holds first frequency variable information related to the speed display unit. Information holding means, and second frequency variable information holding means for holding second frequency variable information relating to the distance display means, wherein the frequency variable output means outputs the frequency of the pulse signal from the travel sensor to the second A first frequency variable output unit that varies based on the first frequency variable information and outputs the drive signal to the drive signal supply unit; and a frequency of a pulse signal from the travel sensor varies based on the second frequency variable information. And a second frequency variable output means for outputting to the distance display means. 2. The first frequency variable output means, when a frequency of a pulse signal defined by a specification of the travel sensor is higher than a frequency range of the deflection angle table, separates the pulse signal supplied from the travel sensor. 2. The speed-distance display device according to claim 1, wherein the frequency range is within the frequency range. 3. The variable frequency output means doubles the pulse signal supplied from the travel sensor when the frequency of the pulse signal defined by the specifications of the travel sensor is lower than the frequency range of the deflection angle table. 2. The speed-distance display device according to claim 1, wherein the frequency range is within the frequency range.