JP3433445B2 - Vehicle speed display method and device, and tachometer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed display method and device, and a tachometer, and more particularly to a rotating object by rotating a pointer of an indicator by an angle corresponding to a cycle of a pulse signal obtained by a rotation sensor. It is suitable for application when displaying the rotation speed.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in a vehicle speed display device 1, a CPU (central processing unit) 3 sends a speed pulse signal S1 obtained by a rotation sensor 2 mounted on an axle to a SIN (sign) signal. ), COS
After pulse width modulation to the (cosine) PWM signal S2,
This PWM signal S2 is output to the cross coil (C / C) 4. The cross coil 4 rotationally drives the pointer 6 of the meter 5 by the deflection angle based on the PWM signal S2.

FIG. 5 shows the relationship between the speed pulse signal S1 and the deflection angle θ of the pointer 6. As shown in FIG. 5, the CPU 3 of the vehicle speed display device 1 has the pointer 6 of the meter 5 for each output update time by the deflection angle θ corresponding to the cycle of the speed pulse signal S1 input immediately before each output update time. It is designed to rotate.

For example, the deflection angle θ1 of the output update time from the time α to the time α + t is the speed pulse signal S for four cycles input during the period t1 immediately before the output update time.
It is determined according to the cycle of 1. The deflection angle θ2 of the output update time from the time point α + t to the time point α + 2t is determined according to the cycle of the four speed pulse signals S1 input during the period t2 immediately before the output update time.

Further, the deflection angle θ3 of the output update time from the time point α + 2t to the time point α + 3t is determined according to the cycle of the four speed pulse signals S1 input during the period t3 immediately before the output update time, The deflection angle θ4 of the output update time from the time point α + 3t to the time point α + 4t is determined according to the cycle of the four speed pulse signals S1 input during the period t4 immediately before the output update time.

As described above, the vehicle speed display device 1 has the output update times α to α + t, α + t to α + 2t, and α + 2, respectively.
α for a certain period immediately before t to α + 3t and α + 3t to α + 4t
-T-α, α-α + t, α + t-α + 2t, α + 2t-
When an edge of the speed pulse signal S1 is detected within α + 3t, the time t1, t2, t traced back to the past pulse by a predetermined number (four in the case of FIG. 5) from the final edge.
3 and t4 are measured. And this time t1, t2, t
By dividing 3 and t4 by the number of pulses (4), each output update time α to α + t, α + t to α + 2t, α
Deflection angle θ at + 2t to α + 3t and α + 3t to α + 4t
The cycle for calculating 1, θ2, θ3, and θ4 is calculated.

By the way, in this way, for a certain period of time α-t to α,
The edges of the speed pulse signal S1 are detected within α to α + t, α + t to α + 2t, and α + 2t to α + 3t.
This is the case when the vehicle is traveling at medium to high speeds.

On the other hand, the vehicle speed display device 1 has the output update times α + 4t to α + 5t, α + 5t to α + 6t, α.
+ 6t to α + 7t, α + 7t to α + 8t, α + 8t to α
Like + 9t, the immediately preceding constant period α + 3t to α + 4t, α
+ 4t to α + 5t, α + 5t to α + 6t, α + 6t to α
Speed pulse signal S within + 7t, α + 7t to α + 8t
If the rising edge of 1 is not detected, the period estimation mode is entered.

That is, in such a case, first, each output update time α + 4t is set with reference to the time point t0 of a predetermined number of previous rising edges from the last rising edge.
~ Α + 5t, α + 5t to α + 6t, α + 6t to α + 7
Time points at the beginning of t, α + 7t to α + 8t, α + 8t to α + 9t α + 4t, α + 5t, α + 6t, α + 7t, α +
The periods t provisional 1, t provisional 2, t provisional 3, t provisional 4, and t provisional 5 up to 8t are measured.

Next, the provisional cycle obtained by dividing each of these provisional t1 to provisional t6 by the number of pulses (4 in the case of FIG. 5) is α + 4t to α + 5t ,.
Considering one cycle from α + 8t to α + 9t, the swing angle values θ provisional 1, θ provisional 2, θ provisional 3, θ provisional 4, θ based on this period.
I am trying to request Provisional 5.

As a result, in the vehicle speed display device 1, the pointer 6 can be smoothly changed when traveling at a low speed.

That is, as shown in FIG. 6, the vehicle speed display device 1 enters the low speed processing mode SP0 when the rising edge of the pulse is not detected within a certain period immediately before the output update time, and the same in the following step SP1. Time points α + 4t, α + at the beginning of each output update time from time point t0
5t, α + 6t, α + 7t, α + 8t, t provisional 1, t provisional 2, t provisional 3, t provisional 4, and t provisional 5 are divided by the same number of pulses (4) to determine provisional at each output update time. Guess the periodicity.

Next, at step SP2, the swing angle values θ provisional 1 to θ provisional 6 of the pointer 6 are calculated based on the estimated period. Then, in step SP3, these swing angle values θ provisional 1 to θ provisional 6 are converted into SIN and COS data, and in step SP4, a voltage corresponding to the SIN and COS data is applied to the cross coil 4 so that at each output update time. The pointer 6 is rotated by the swing angle values θ provisional 1 to θ provisional 6, and the low speed processing mode is ended in the subsequent step SP5.

[0014]

However, the process of estimating the period of the speed pulse signal S1 in the low speed region is actually
The period of the immediately preceding speed pulse signal S1 is not calculated, but rather the time is traced back to a time point t0 which is quite past.
From the time immediately before the output update time.

Therefore, the responsiveness of the deflection angle value of the pointer 6 to the actual vehicle speed deteriorates, and it takes a very long time to return the pointer 6 to the position corresponding to 0 km / h. As a result, the pointer 6 slowly moves to 0 km /
There was a drawback that the phenomenon of falling to a position equivalent to h occurred.

The present invention has been made in consideration of the above points, and a vehicle speed display method and apparatus for rotating the pointer in a low speed range so that the pointer can be moved without feeling uncomfortable with the speed, and its rotation and rotation. It is intended to propose a total.

[0017]

According to a first aspect of the present invention, there is provided a vehicle speed display method according to the present invention for solving the above-mentioned problems .
By using the edge , by rotating the pointer of the meter for each update time by the deflection angle corresponding to the average period of the predetermined number of the speed pulse signals input immediately before each update time, Display the speed and display the speed within the update time.
If the edge of the pulse signal is not detected,
The vehicle is judged to be in the low speed state, and is judged to be in the low speed state.
After that, the deflection angle at each update time is set to the speed pulse
The predetermined number of times before the last edge of the signal
Elapsed time from the edge of the pulse signal to the update time
The average circumference estimated by dividing
A method for displaying the vehicle speed corresponding to the period, in which a predetermined time has elapsed from the last edge of the speed pulse signal .
It detects that the vehicle speed is zero or near zero,
The deflection angle of the pointer for each update time after being output is sequentially changed to a value obtained by dividing the deflection angle of the previous update time by a number N larger than 1.

The vehicle speed display device according to a second aspect of the present invention is, as shown in FIG. 1, a rotation sensor 11 for generating a speed pulse signal S1 and each update time for each update time. Cycle detecting means 12 for detecting the average cycle of a predetermined number of speed pulse signals S1 inputted immediately before, and for each update time, only a deflection angle corresponding to the cycle detected by the cycle detecting means 12. A pointer driving means 13 for rotating the pointer 6 of the meter 5 and a speed pulse signal S1
And a zero-state detecting means 14 for detecting that the vehicle speed is close to zero or zero based on the speed path within the update time
Vehicle is slow when no edge of the loose signal is detected
When updating after it is judged to be in a state and it is judged to be a low speed state
Set the deflection angle of the pointer for each interval to the end of the speed pulse signal.
From the edge of the speed pulse signal a certain number of times before
The elapsed time up to the update time can be divided by a specified number.
The vehicle speed display device calculated according to the average period estimated by
The zero state detecting means 14 is the
After a predetermined time has passed, the rotation speed has become zero or close to zero.
When the zero state detecting means 14 detects that the vehicle speed is zero or close to zero , the pointer driving means 13 detects in advance the deflection angle of the pointer 6 for each update time. The deflection angle of the update time of is sequentially changed to a value divided by the number N larger than 1.

As a result, the vehicle speed is not yet zero.
Smoothly changes the deflection angle of the pointer even in such low speed range
Vehicle speed from low speed range to zero speed
As a whole, the guideline is smooth and responsive when transitioning
Will return to the position of zero. Further, by appropriately setting the value of N, it becomes possible to arbitrarily change the responsiveness of the pointer 6 that follows the transition of the vehicle speed to zero. Further, since the swing angle of the update time that is earlier in time is sequentially divided by N, the straightness of the swing angle of the pointer 6 can be maintained. Thus, the pointer 6 can be smoothly and responsively returned in the low speed range according to the deceleration of the vehicle.

[0020]

[0021]

A tachometer according to a third aspect of the present invention is a rotation sensor for generating a pulse signal according to rotation of a rotating object, and each update time for each update time. Cycle detecting means for detecting the cycle of the pulse signal input immediately before, and pointer driving means for rotating the pointer of the display by the deflection angle corresponding to the cycle detected by the cycle detecting means at each update time, Zero state detection means for detecting that the rotation speed of the rotating object has become zero or close to zero based on the pulse signal, and an edge of the pulse signal within the update time.
If not detected, the rotation speed is low
Of the update time after it is determined that the low speed state
Whether the deflection angle of the pointer is the last edge of the pulse signal
From the edge of the pulse signal before the predetermined number
Divide the elapsed time until the new time by the specified number
It is a tachometer calculated according to the average period estimated in
Then, the zero state detecting means is operated for a predetermined time from the last edge.
The fact that the rotation speed has become zero or close to zero as time passes
The pointer drive means detects the deflection angle of the pointer for each update time after the zero state detection means detects that the rotation speed becomes zero or close to zero, and indicates the deflection angle of the previous update time. The swing angle is sequentially changed to a value divided by a number N larger than 1.

As a result, by appropriately setting the value of N, it becomes possible to arbitrarily change the response of the pointer that follows the rotation speed when it shifts to zero. Further, since the deflection angle of the update time that is previous in time is sequentially divided by N, the linearity of the deflection angle of the pointer can be maintained.
Thus, the pointer can be returned smoothly and responsively in response to the deceleration of the rotation in the low rotation range.

[0024]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 10 indicates a vehicle speed display device as a whole, which is input to a rotation sensor 11 for generating a speed pulse signal S1 corresponding to the rotation of an axle and to each update time immediately before each update time. Speed pulse signal S
Cycle detecting means 12 for detecting the cycle of 1, a pointer driving means 13 for rotating the pointer 6 of the meter 5 by a deflection angle corresponding to the cycle detected by the cycle detecting means 12 at each update time, and a speed pulse signal. A zero state detecting means 14 for detecting that the vehicle speed becomes zero or near zero based on S1.

Here, the pointer driving means 13 sets the period detected by the period detecting means 12 to SIN (sign), COS.
By converting to (cosine) data and applying a voltage according to the SIN and COS data to the cross coil,
The pointer 6 is rotationally driven by a deflection angle corresponding to the cycle of the speed pulse S1 for each update time.

Next, the vehicle speed display device 10 will be described with reference to FIG.
The operation of will be described. The vehicle speed display device 10 is configured to rotate the pointer 6 of the meter 5 for each output update time by the deflection angle θ corresponding to the cycle of the speed pulse signal S1 input immediately before each output update time.

For example, the deflection angle θ1 of the output update time from the time α to the time α + t is the speed pulse signal S for four cycles input during the period t1 immediately before this output update time.
It is determined according to the cycle of 1. The deflection angle θ2 of the output update time from the time point α + t to the time point α + 2t is determined according to the cycle of the four speed pulse signals S1 input during the period t2 immediately before the output update time.

Further, the deflection angle θ3 of the output update time from the time point α + 2t to the time point α + 3t is determined according to the cycle of the four speed pulse signals S1 input during the period t3 immediately before this output update time, The deflection angle θ4 of the output update time from the time point α + 3t to the time point α + 4t is determined according to the cycle of the four speed pulse signals S1 input during the period t4 immediately before the output update time.

As described above, the vehicle speed display device 1 outputs the output update times α to α + t, α + t to α + 2t, and α + 2, respectively.
α for a certain period immediately before t to α + 3t and α + 3t to α + 4t
-T-α, α-α + t, α + t-α + 2t, α + 2t-
When an edge of the speed pulse signal S1 is detected within α + 3t, the time t1, t2, t traced back to the past pulse by a predetermined number (four in the case of FIG. 2) from the final edge.
3 and t4 are measured. Then, the cycle detecting means 12 divides the times t1, t2, t3, and t4 by the number of pulses (4), so that each output update time α to α + t, α +.
t to α + 2t, α + 2t to α + 3t, α + 3t to α + 4
The cycle for obtaining the deflection angles θ1, θ2, θ3, and θ4 of t is calculated.

By the way, in this way, for a certain period α-t to α,
The edges of the speed pulse signal S1 are detected within α to α + t, α + t to α + 2t, and α + 2t to α + 3t.
This is the case when the vehicle is traveling at medium to high speeds.

On the other hand, in the vehicle speed display device 10, the output update times α + 4t to α + 5t, α + 5t to α + 6t,
As in α + 6t to α + 7t, the immediately preceding constant period α + 3t to
When the rising edge of the speed pulse signal S1 is not detected within α + 4t, α + 4t to α + 5t, and α + 5t to α + 6t, the cycle estimation mode is entered.

That is, in such a case, first, each output update time α + 4t with reference to the time point t0 of a predetermined number of previous rising edges from the last rising edge.
~ Α + 5t, α + 5t to α + 6t, α + 6t to α + 7t
The periods t provisional 1, t provisional 2, and t provisional 3 until the start time points α + 4t, α + 5t, and α + 6t are measured.

Next, the provisional cycle obtained by dividing each of these provisional t1 to provisional t3 by the number of pulses (4 in the case of FIG. 2) is α + 4t to α + 5t ,.
It is considered that there is one cycle from α + 8t to α + 9t, and the swing angle values θ provisional 1, θ provisional 2, and θ provisional 3 are obtained based on this period.

As a result, in the vehicle speed display device 10, the pointer 6 can be smoothly changed when traveling at a low speed.

Further, the vehicle speed display device 10 updates the deflection angle of the pointer 6 for each update time after the zero state detecting means 14 detects that the vehicle speed is zero or close to zero, in the previous time. The time deviation angle is sequentially changed to a value divided by a number N larger than 1.

Here, as shown in FIG. 2, the zero-state detecting means 14 detects the vehicle speed when the next rising edge is not detected even after a lapse of time T from the time tα when the speed pulse signal S1 last rises. Is determined to be zero. In the case of FIG. 2, it is determined that the vehicle speed has become zero at time tβ.

Then, the update period α + 7t to α + 8t, α + after the time point tβ when it is detected that the vehicle speed becomes zero.
8t to α + 9t, α + 9t to α + 10t, ... Deflection angle values θ provisional 4, θ provisional 5, θ provisional 6, ... Are sequentially obtained by dividing the deflection angle of the previous update time by a number N larger than 1. .

That is, the deflection angle value θ provisional 4, θ provisional 5,
The θ provisional 6 is sequentially obtained by θ provisional 4 = θ provisional 3 / N, θ provisional 5 = θ provisional 4 / N, θ provisional 6 = θ provisional 5 / N ,.

Thus, in the vehicle speed display device 10, by appropriately setting the value of N, the responsiveness of the pointer 6 that follows the change of the vehicle speed to zero can be arbitrarily changed. . Further, since the swing angle of the update time that is earlier in time is sequentially divided by N, the straightness of the swing angle of the pointer 6 can be maintained. Thus, the pointer 6 can be smoothly and responsively returned in the low speed range according to the deceleration of the vehicle.

That is, the vehicle speed display device 10 can smoothly and responsively return the pointer 6 in accordance with the deceleration of the vehicle by executing the processing procedure shown in FIG. 3 when the vehicle speed is low. .

The vehicle speed display device 10 enters the low speed processing mode SP10 when the rising edge of the pulse is not detected within a certain period immediately before the output update time, and the zero state detection means 14 detects the zero vehicle speed in the following step SP11. It is determined whether or not it is detected, and if it is not in the zero state, the process proceeds to step SP12.

At step SP12, the time points α + 4t, α + 5t, α at the beginning of each output update time from the same time point t0.
By dividing the periods t provisional 1, t provisional 2, and t provisional 3 up to + 6t by the same number of pulses (4), the provisional cycle at each output update time is estimated.

Next, the vehicle speed display device 10 operates in step SP.
13, the deflection angle value θ of the pointer 6 based on the estimated period
Provisional 1 to θ provisional 3 are calculated. Then, in step SP14, these swing angle values θ provisional 1 to θ provisional 3
Is converted to SIN and COS data, and the voltage corresponding to the SIN and COS data is applied to the cross coil in step SP15 to rotate the pointer 6 by the swing angle value θ provisional 1 to θ provisional 3 at each output update time. Continuing step S
The low-speed processing mode is ended at P17.

On the other hand, the vehicle speed display device 10 proceeds to step SP16 when the zero speed detecting means 14 detects the zero vehicle speed state in step SP11. In this step SP16, the deflection angle of the pointer 6 for each update time is sequentially changed to a value obtained by dividing the deflection angle of the previous update time by a number N larger than 1. That is, θ provisional 4 = θ provisional 3 / N, θ provisional 5 = θ provisional 4 / N, θ provisional 6 = θ provisional 5 / N, and so the deflection angle value θ provisional 4, θ provisional 5, θ provisional 6, ... Sequentially ask for.

The vehicle speed display device 10 has a step SP16.
After that, the process proceeds to step SP14, where the swing angle values θ provisional 4 to θ provisional 6 are converted into SIN and COS data, and step SP1
5, the voltage corresponding to the SIN and COS data is applied to the cross coil to rotate the pointer 6 by the swing angle value θ provisional 4 to θ provisional 6 at each output update time, and the low speed processing mode is ended in the subsequent step SP17. To do.

Thus, according to the above configuration, the swing angles θ provisional 4 to θ provisional 6 of the pointer 6 for each update time after it is determined that the vehicle speed has become zero or close to zero are set to the previous update time. By gradually changing the deflection angle to a value obtained by dividing the deflection angle by a number N larger than 1, it becomes possible to smoothly and responsively return the pointer 6 in accordance with the deceleration of the vehicle in the low speed range.

In addition to this, when the edge of the speed pulse signal S1 is not detected within a certain period immediately before the update time, it is determined that the vehicle is in the low speed state, and after it is determined that the vehicle is in the low speed state. The cycle for each update time is estimated based on the speed pulse signal S1 input from the same point in time before the certain period to the point immediately before each update time, so that the cycle from the low speed range becomes zero. When the vehicle speed shifts to the speed, the pointer 6 returns to the position corresponding to 0 km / h with smoothness and responsiveness as a whole.

In the above embodiment, the case where the present invention is applied to the vehicle speed display device has been described, but the present invention is not limited to this, and a tachometer for displaying the rotational speed of a rotating object by a pointer. Can be widely applied to.

[0050]

As described above, according to the first and second aspects of the present invention, the vehicle speed changes from the low speed range to the zero speed.
Smooth and responsive as a whole, the pointer is equivalent to zero
It will return to the position of, and the pointer will be more comfortable with the speed.
It is possible to move the pointer and to smoothly and responsively return the pointer 6 in accordance with the deceleration of the vehicle in a low speed range, and to realize a vehicle speed display method and device for moving the pointer without feeling discomfort with the speed. You can

[0051]

Further, according to the invention described in claim 3, it is possible to realize a tachometer capable of returning the pointer smoothly and with good responsiveness in response to deceleration of rotation in a low rotation range.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a vehicle speed display device according to the present invention.

FIG. 2 is a timing chart for explaining the operation of the vehicle speed display device according to the present invention.

FIG. 3 is a flowchart showing a procedure of calculating a deflection angle in a low speed state by the vehicle speed display device of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional vehicle speed display device.

FIG. 5 is a timing chart for explaining the operation of the conventional vehicle speed display device.

FIG. 6 is a flowchart showing a procedure for calculating a deflection angle in a low speed state by a conventional vehicle speed display device.

[Explanation of symbols]

5 ... Meter 6 ... Guidelines 10 ... Vehicle speed display device 11 ... Rotation sensor 12 Cycle detection means 13 ... Pointer drive means 14 ...... Zero state detection means S1 …… Speed pulse signal

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01P 3/489 G01P 13/00 G01R 23/10

Claims (3)

(57) [Claims] 1. An edge of a speed pulse signal formed according to a vehicle speed is used, and a predetermined number of speed pulse signals input immediately before each update time are used for each update time.
Displays the speed of the vehicle by rotating the pointer of the meter only deflection angle corresponding to the average period, before within the update time
When the edge of the speed pulse signal is not detected
Is determined that the vehicle is in a low speed state, and the deflection angle of each update time after the low speed state is determined.
From the last edge of the speed pulse signal
From the edge of the speed pulse signal before the fixed number,
Divide the elapsed time until the new time by the specified number
Display of vehicle speed corresponding to the average period estimated in
A method, wherein a predetermined time has elapsed from the last edge of the speed pulse signal.
Detects that the vehicle speed has become zero or close to zero due to passing
The vehicle speed is characterized in that the deflection angle of the pointer for each update time after the detection is sequentially changed to a value obtained by dividing the deflection angle of the previous update time by a number N larger than 1. Display method. 2. A rotation sensor for generating a speed pulse signal, cycle detecting means for detecting an average cycle of a predetermined number of the speed pulse signals input immediately before each update time, for each update time, and each of the above. For each update time, pointer drive means for rotating the pointer of the meter by the deflection angle corresponding to the average cycle detected by the cycle detection means, and that the vehicle speed has become zero or close to zero based on the speed pulse signal. A zero state detecting means for detecting, and detecting the edge of the speed pulse signal within the updating time.
If it is not issued, it is determined that the vehicle is in a low speed state
However, the finger at each update time after it is determined that the speed is low
Set the deflection angle of the needle to the last edge of the speed pulse signal.
From the edge of the speed pulse signal before the predetermined number
To the relevant update time divided by the specified number
A vehicle that corresponds to the average period estimated by calculating
In the dual speed display device, the zero-state detection means has a predetermined time from the last edge.
Detects that the vehicle speed is also zero was close to zero in the fact, the pointer drive means, said each of the update time after it is detected that the vehicle speed is close to zero or zero by the zero-state detecting means A vehicle speed display device, characterized in that the deflection angle of the pointer is sequentially changed to a value obtained by dividing the deflection angle of the previous update time by a number N larger than 1. 3. A rotation sensor that generates a pulse signal according to the rotation of a rotating object, and a predetermined input that is input immediately before each update time for each update time.
Cycle detection means for detecting the average cycle of the number of the pulse signals, and for each update time, pointer drive means for rotating the pointer of the display by the deflection angle corresponding to the cycle detected by the cycle detection means, Zero state detection means for detecting that the rotational speed of the rotating object has become zero or close to zero based on the pulse signal, and an edge of the pulse signal is not detected within the update time.
If it is determined that the rotation speed is low,
After the judgment of the low speed condition,
The deflection angle from the last edge of the pulse signal to the predetermined
From the pulse signal edge before the number of times to the update time
Estimated by dividing the elapsed time of
A tachometer obtained corresponding to the averaging period, wherein the zero-state detecting means has a predetermined time from the last edge.
Detected that the rotation speed has become zero or close to zero.
And, the pointer drive means, the deflection angle of the pointer for each of the update time after the rotational speed becomes close to zero or zero is detected by the zero-state detecting means, temporally previous update time A tachometer characterized by sequentially changing the deflection angle of 1 to a value divided by a number N larger than 1.