JPS58155363A - Display for vehicle - Google Patents

Abstract

PURPOSE:To accurately calculate and display information on the rotation of vehicle members by calculating the number of revolution such as the revolutions of the engine at an interval of a fixed time from an integral number of pulses and a total time for each cycle. CONSTITUTION:A rotary pulse train 6 is taken into a computer 8 as input signal and a pulse edge detection circuit 11 detects eacn rising edge 12a of the rotary pulse train 12 to execute an interrupt routine in the course of the processing of a main program executed in a computer 8. Then, in the interrupt routine, a processing is performed with a pulse edge time measuring section 15 to get the current time (t) stored into a memory tp(n)16a for pulse edge time generating a timer 14. On the other hand, the pulse edge time tp(n)29b the closest prior to the rear end time ts(n)28b among the pulses 6 in a pulse edge updating section 22 is stored into a memory tp(n-1)16d to be utilized as pulse edge time tp(n-1)42 the closest prior to the front end time of the subsequent fixed time Tc27b. The number of pulses gamma per unit time averaged from a total time tp(n) -tp(n-1) for cycles of rotary pulses in an integral number of rotary pulse trains as difference between the tp(n-1) and the tp(n) thus stored and the number of pulses NP in the rotary pulse train is calculated at an interval of the fixed time Tc to determine the veicle speed accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle such as an automobile, in which wrinkles related to rotational information of vehicle members, such as vehicle speed due to wheel rotation and engine rotational speed due to crankshaft rotation, are displayed on an instrument panel. The present invention relates to a display device.

In order to display vehicle speed, engine speed, etc. in conventional vehicle display devices, an uneven part is provided on the outer periphery of a rotating disk in synchronization with the wheels and crankshaft, and this uneven part is placed near the electromagnetic big edge detection part. A method of counting the rotational pulse train electrically generated by passing the wheel for a certain period of time, converting it to the number of rotations per unit time, or converting it to the vehicle speed in the case of wheel rotations, and then displaying it on a display element. is used.

In addition to the method of counting the number of pulses included within a certain period of time, a method of calculating the number of rotations and vehicle speed by counting the period of one pulse is also used.

However, in such conventional pulse processing methods for vehicle display devices, if the number of pulses included in a certain period of time is counted, the number of pulses is not necessarily an integral number. When the number of pulses included in the data is large, the calculation error in the rotation speed is small, but the rotation is slow and
There is a drawback that when the number of pulses included within a certain period of time is small, the error in calculating the rotational speed becomes large.

On the other hand, in the case of the method of measuring the pulse period of la, even when rotating at a constant speed, minute rotational fluctuations occur due to machining errors in the uneven parts of the rotating disk, so each period is measured individually. There was a drawback that even if the number of rotations was calculated every time, the number of rotations could not always be calculated accurately.

This invention was made to eliminate the above-mentioned conventional drawbacks, and calculates the rotation speed from several Nocels numbers every predetermined time and the total time of each cycle, thereby obtaining information regarding the rotation of vehicle members. Accurate calculation purpose.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a vehicle display device of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a Sakaki melon according to an embodiment of the present invention. In FIG. 1, l rotates around the rotation center 2 in synchronization with the rotation of wheels (not shown), When the convex portion 4 approaches and passes by the rotation of the rotating disk 1, which is a rotating disk made of a magnetic material and has a convex portion 4, the stain magnetic pisokatsu f5 is detected 1 (S5a generates an electromotive force). It has become.

The electromotive force signal generated by the electromagnetic pickup 5 is transmitted to the waveform circuit 7.
The rotating pulse train 6#-i converted into a rectangular wave is transferred to the i1 input terminal of the pulse edge detection circuit Wslx of the computer 8. The rotational pulse train 6 is designated by the reference numeral 12 in the computer 8 . The computer 8 performs this rotation) from 4 pulses to the repulse train 12t-
process, measure the vehicle speed, and send a display signal 10 to the display drive circuit 9.
This outputs the following.

In the computer 8F'3, the reference voltage 11& is applied to the second human power input of the pulse edge detection circuit 11, so that the pulse edge detection circuit 11 compares the rising edge of the rotational pulse train 12 with the reference voltage 11&. Then, the detection signal 13 is sent to the Nokuru Edge time measurement unit 15.
It is designed to be sent to

The output from the timer 16 is added to the side part 15[a of the conopal edge timepiece, and the timer 14Fi
If the current time ty occurs, the matapulse edge time measurement unit 15 ij 14 Lux: L 7 ') 121
The time is recorded in the timer 14, and the memory tp(n
) 16a. The output of this false edge time measuring section 15 is transferred to the false counter l517, and the false edge counter as17 increments the contents of the memory NP16b by 1 every time the false edge 12a is detected. This is to count the number of rotations.

On the other hand, 18 is the time detected last time, that is, the fixed time TCO
When the front end time yrts(nl) is used, it means that a predetermined period of time Tc has elapsed from this time, that is, the current time t indicated by the timer 14 is the front end time ts(n-1
)', it is detected that the end time of the fixed time Tc set based on 19 is a certain time elapse detection unit that returns
1) The rotational pulse edge time tp(n-1) closest to this leading edge time ts(n-1) before and the trailing edge time ts(n-1)
), which is the difference from the rotation/f edge time tp(n) closest to this rear end time ts(n) before ), that is, the total time of the period of each rotational pulse of an integer number of rotational pulse trains, that is, tp(n) - tp (n-1) and the rotation/4 rus@NP of this rotating arm train, the number γ of 9 pulses per unit time, that is, γ=Np/(tp
(n)-4p(n-1)) every time the predetermined time 'fe elapses.

20ti is a vehicle speed calculation unit that calculates the vehicle speed V, that is, ■ = γ based on the 74 pulse number rK of the vehicle that roared for the unit time. It is.

21 is a fixed time 'f for the next flight after a certain time Te has elapsed.
Time ts(n+1) after c, that is, t m Cn+1
) = t g(n) + Te is stored in the memory tm15e. 22 is a rear end time setting section that stores the value of pulse edge time t p (n) used in calculating the rotation speed as t p (n-1) at the next calculation. The memory t
This is a pulse edge time update unit that stores p(n-1)16dK.

Furthermore, reference numeral 23 indicates a memory clear section for counting rotation pulses, which clears the memory NP for counting rotation pulses to zero after a certain period of time Te has elapsed; Display element 25
This is a display signal output section that transmits a signal to the display drive circuit 9 that performs t-drive.

FIG. 2 is a time chart showing the time relationships of the rotating nockle train 6, constant time T c %, pulse edge times tp(n-1), tp(n), etc. in the explanation of the vehicle display iron wrinkles in FIG. 1. , 26 is a time axis, 6 is a rotating pulse train signal 1, 27a, 27b is a fixed time 'l'c,
28m, 28b, and 28c are each in turn for a certain period of time Tc2
7at standard, leading end time ts(n-1), trailing end time ts(n), leading end time t of the next constant time tc27b
m (n+1), 29& is time ta(n-1)28
Pulse edge time tp(n 1
)29bt'i time tl(n) is the closest ΔR edge time tp(n) before 28b.

3 and WJ4 are flowcharts of an interrupt routine showing the process in which programs stored in instruction codes are sequentially processed in the computer 8 shown in FIG. , 30 is an interrupt start point where an interrupt is made in the middle of the normal execution of the main routine (not shown) due to the rotational arm edge tZa in FIG. 1 being detected by the detection circuit 11.
! i), 31Hill/, the gramogram group corresponding to the analogue edge time hand side [l115, 32 is the program group corresponding to the delta pulse counter 17 in FIG. This is the return point.

On the other hand, in FIG. 4, reference numeral 34 indicates an interrupt which interrupts the normal program execution by the main routine when the elapse of a certain time Te is detected by the certain time elapse detection section 18 in FIG. Starting point, 35 is a program group corresponding to the number of pulses per unit time calculation section shown in FIG. 1, 36 is a program group corresponding to the vehicle speed calculation section shown in FIG. 1, and 37 is a rear end time setting shown in FIG. 38Hffi1A program group corresponding to the arm stitch time change tr section in Fig.1, 39 is w, a program group corresponding to the armpit stitch number memory clear section in Fig. 1, 40 is a program group corresponding to the armpit stitch count memory clear section in Fig. The program group 41 corresponding to the display signal output portion of the program group 40 is a return point at which the program returns to the main routine after the program group 40 is completed.

Next, the vehicle display a of the present invention constructed as described above will be described.
The operation of t will be explained. The rotation pulse train 6 generated by the rotation of the wheel is taken as an input signal to the computer 8, and a pulse edge detection circuit 11Fi is executed in the computer 8 by detecting each rising edge of this rotation/pulse train 12. In the middle of main program processing, I! Execute the interrupt routine shown in Figure 3.

In the interrupt routine of FIG. 3, the program group 31.
32 are executed sequentially, and in the program group 31, l
The processing by the pulse edge time counter section 15 in Figure 111 is delayed, and the pulse edge time memo IJ t p (n)
16a Stores the current time t generated by the K timer 14.

In the program group 32, W, the processing by the pulse counting section 17 shown in Fig. 1 is not performed, and the pulse counting memo 1JNP1
The contents of 6b are increased by 't1. When the execution of the program group 32 is completed, the program returns to the main program according to the return point 33.

On the other hand, the fixed time elapse detection unit 18 in FIG. If they match, the interrupt routine shown in FIG. 4 is executed during execution of the main program.

In this figure 4, as in figure 3, program group 3
5 to 40 are executed sequentially, and first in program group 35, /? per unit time in figure 7141 is executed. 19 processing is done, and the tough parable γ per unit time
is calculated. As mentioned above, this arm number γ is the rotation number averaged over an integer number of arm rows, so it is possible to obtain a more accurate rotation number than in the past.

In the program group 36, the vehicle speed calculation unit 20 in FIG.
Then, the vehicle speed V is calculated.

! In the program group 37, the processing of the rear end time setting unit 22 in FIG. 1 is performed, and the next interrupt time tm(n+1) 28e in FIG.
6 to be memorized.

In the program group 38, the processing of the pulse edge time update unit 22 in FIG. 1 is performed, and the trailing edge time ts in FIG.
(The memory tp(n 1) 16dK is stored in order to use Q129b as the closest time tp(n-1)42 before the front end time of the next fixed time Tc27b.

! In the program group 39, the processing of the pulse counting memory clear section 23 shown in FIG. 1 is performed, and the memory NP16b is cleared to zero. Finally, in the program group 40, the display signal output unit 24 shown in FIG.
Convert to 0 and output.

1 display driving time #6 which returns to the main program according to the return point 41 when the execution of the program group 40 is completed.
Reference numeral 9 drives the display element 25 in a predetermined display format based on the display signal lO output above to display the vehicle speed 'Ik.

As explained above, (1) according to the vehicle display device of the present invention, the nearest pulse edge time tp(n-1) before the leading edge time of the constant time Tc and the nearest pulse edge time tp(nJ) before the trailing edge time of the constant time Tc. The total period of each rotational pulse of an integer number of rotational pulse trains, which is the difference between tp(n)−t
Since the average number of pulses per unit time γ is calculated from p(n-1) and the number of pulses NP of this rotating 14 pulse train every fixed time Tc, whether it is a single speed or a positive 1 jlK
This has the effect of being able to be calculated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the vehicle display device of the present invention, FIG. 2 is a time chart of a rotational pulse train applied to the vehicle display device, and FIGS. In the computer in the vehicle display device, respectively! 3 is a flowchart of an interrupt routine for executing a program. l... Rotating disk, 5... Electromagnetic pickup, 8- Computer, 9... Display drive circuit, i 1-'' pulse edge detection circuit, 14... Timer, 15...- Pulse edge time measuring section, 16&-16d-...Memory, 17
...Pulse counting section, 18...Salmon excess detection device for a certain period of time,
19... Lump number calculation unit, 2o... Vehicle speed calculation unit,
21-Rear end time setting unit, 22-Pulse edge time updating unit, 23...Pulse counting memory clear unit, 24-°
-Display signal output section, 25--Display element. Agent Makoto Kuzuno - Figure 2 Figure 3 Figure 4 Procedural amendment (Yuli) Mr. Commissioner of the Japan Patent Office 1 Grino indication Patent application Sho I? -@I
! 111 Ordinance 2 Name of Kyomei Vehicle noise display device 3 Relationship to the case of the person making the amendment Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Nihachi Katayumi Department 4 Agent fL Address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo
No. 5: Claims column and Detailed Description of the Invention column of the specification subject to amendment. [Contents of amendment (1) Scope of claims [Amended as shown in the attached sheet.] +2> Page 5 Ig9 line Or 16 Jt”r 14
J ill correct. (3) * 5 page tlL lr line or rNPJ t
rNpJ Color correction. (4) Correct as rNP J f rNp J on page 6, line 16. (5) Page 7, line 15 o rNPJ vt rNpJ
Tom correct. (6) Correct with rtcJlrTcJ on page 8, line 7. (7) “Front end time t, (n+1) J” on page 8, line 8
l "Correct as rear end time 1g (ss+1) J. (8) f tp (11-1) 29 on page 8, line 10
b J trtp(n-1), 29b". (9) “Immediately correct it to JkrNpJ” on page 10, line 16. (II r/#Rus y J t- on page 11, line 9
Correct it as "r a r x number r". Ql) Page 12, line 8 no rNPJ tl-rNpJ
and correct it. 0 section Correct r NP J on page 13, line 4 to rNpJ. 7. List of attached documents Claims One or more Claims A rotational pulse train generating means for generating a rotational pulse train corresponding to the rotation WxK of a rotating member of a vehicle, the rise of the pulse of the rotational pulse train being 9. or a falling pulse edge, a timer that generates a current time, and a timer that detects the notal edge of the one-turn pulse [water-containing pulse edge time adjustment means;
9 pulse counting means (for counting the number of pulses); one foot time elapse detection means for determining, by the timer, that the predetermined foot time has elapsed each time a predetermined foot time elapses; The difference between the noggle edge time closest to this front end time and the pulse edge time closest to the rear end time before the rear end time, and the total time of each rotational pulse period of an integer number of rotational pulse trains and this rotation/mother pulse. row/
9 Δ russ numbers per unit time from the arm lass number; rotation speed calculation means that calculates each foot time elapsed; calculation based on the /4 russ number per unit time, or this number of pulses; A display device for a vehicle, comprising a display unit for driving a display element for displaying a physical quantity representing a driving condition IDr of a vehicle.

Claims (1)

[Claims] A rotational pulse train generation means for generating a rotational pulse train corresponding to the rotational speed of a rotating member of the vehicle, a pulse edge detection means for detecting one of the rising and falling edges of the pulse of the rotational pulse train, and a pulse edge detection means for generating the current time. A timer to set the time of the mother pulse edge of the rotation pulse.
f: pulse edge time measuring means containing water in the timer;
9. Luss counting means for counting the number of previous lues, a predetermined time elapse detection means for determining the elapse of a predetermined period of time by the timer every time a predetermined period of time elapses, and before the elapsed time of the predetermined period of time. /e closest to this leading edge time
II/
From the total time of each rotational pulse cycle of an integer number of rotational pulses with a difference from the edge time close to the edge time and the number of pulses of this rotational sequence, J? a rotation speed calculating means for calculating the number of pulses at each lapse of the certain period of time; and a display for driving a display element that displays the number of pulses per unit time or a physical quantity representing the driving state of the vehicle calculated based on the number of pulses. A vehicle display device equipped with a driving means.