JPH06258335A - Method and apparatus for measurement of acceleration and deceleration performance - Google Patents

Abstract

PURPOSE:To measure the unloaded running time and a distance-based actual average velocity in a real-time manner without a measuring irregularity and to measure the performance of an acceleration and a deceleration by a method wherein an intermediate velocity is set between an initial velocity and a target velocity, the time which elapses until the intermediate velocity is reached is measured and the unloaded running time is computed. CONSTITUTION:A plurality of intermediate velocities are set between an initial velocity and a target velocity, and a first reference intermediate velocity Va and a second reference intermediate velocity Vb [where (b)>(a)] are selected out of them. Then, while the velocity of a vehicle or the like is being measured continuously, the time which elapses from the time when an adjustable-velocity instruction has been issued up to the time when the individual intermediate velocities are reached is measured. Individual unloaded running times are computed on the basis of obtained data, and their irregularity is judged. When the irregularity is judged to be small, the individual unloaded running times which have been comouted regarding the reference intermediate velocities are displayed as unloaded running times. A distance-based actual average velocity is found by using the unloaded running times and a braking distance, or the braking distance is computed on the basis of the reference velocity of the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring method and a measuring device for the acceleration / deceleration performance of a moving body represented by the braking performance of railway vehicles and automobiles. Particularly, by setting a suitable intermediate speed between the initial speed and the target speed, measuring the time until the intermediate speed is reached, and calculating idle running time based on that time The present invention relates to a method and a device capable of measuring.

[0002]

2. Description of the Related Art The prior art will be described by taking the braking performance of a railway vehicle as an example. FIG. 6 shows JISE 4007-19.
It is a figure which shows how to obtain | require the idle running time defined by 76. FIG. 6 shows a state in which the vehicle receives a brake operation command and the speed gradually decreases from the current speed "V ₀ " to a predetermined speed "V _n ". In FIG. 6, point A is a point where a brake command is issued, such as operating a brake valve, and after that, the braking effect begins to appear from point B after a short time, the speed gradually decreases, and point D From then on, the deceleration becomes almost constant, and continues until the point E which reaches the predetermined speed "V _n ". The curve BD as a transitional state exists because it takes a certain amount of time from when the brake cylinder pressure starts to rise to when it reaches a predetermined pressure. In this case, the braking distance traveled by the vehicle is represented by the "speed-time curve" (thick solid line) and the area ABDEG surrounded by the horizontal and vertical axes. Now, if a straight line parallel to the horizontal axis is drawn from point A and the intersection with the extension of ED is point C, the time t ₀ from A to C is called the free running time.

Conventionally, the free running time t ₀ has been obtained by a manual work by the following method. Record the speed of the vehicle with a pen recorder. Find the part where the brake characteristic curve is almost straight, and draw the straight line of that part (line EDC in FIG. 6). Find point C and read the time from A to C.

[0004]

The above-mentioned conventional method has the following problems. It took a lot of work because of the manual work. Since the line DC is drawn by a sensory judgment, it was necessary to experience until a reasonable value can be obtained. Even in that case, there were individual differences in the obtained values. It was not possible to give a performance value in real time during the vehicle running test. Therefore, the flexibility of the running test was lacking.

The present invention, without requiring manpower, no human measurement variations, also the acceleration and deceleration performance which can measure the air run time t _o and distance-based actual mean deceleration in real time measurement method and measurement device The purpose is to provide.

[0006]

In order to solve the above-mentioned problems, the acceleration / deceleration performance measuring method of the present invention uses a vehicle or the like having an initial velocity V.
A method of measuring acceleration / deceleration performance by measuring idle time when accelerating / decelerating from ₀ to a target speed V _n , wherein a plurality of intermediate velocities V ₁ , V ₂ , ... Between V _{0 and} V _n are measured. , V
_In the first step of setting _n-1 , the first reference intermediate speed V _a and the second reference intermediate speed V _b (b>
The second step of selecting a), the third step of continuously measuring the speed of the vehicle, etc., and the time (t ₁ , t ₂ , ...) From the issuance of the acceleration / deceleration command until the intermediate speed is reached is measured. fourth step, the first reference intermediate velocity V _a, the speed reaching time t _a, and the intermediate speed _{V i (i = a + 1} , a + 2,
.., b), using the same velocity arrival time t _i , for each _i , the equation t _0i = t _a − | (t _i −t _a ) × (V ₀ −V _a ) / (V
_a -V _i) | by the fifth step of calculating an individual Sorahashi time t _oi, resulting sixth step of determining the variation of individual Sorahashi time t _oi, when the variation is determined that the small, the above equation in i = b calculated individually Sorahashi time t _ob displays the empty run time for, upon determining the variation and large is characterized in that it comprises a seventh step of displaying to that effect.

Here, the intermediate speed can be set according to the following formula: V _i = V _0- (V ₀ -V _n ) × (100-R _i ) / 100 (R _i is a predetermined% value) preferable. This is because even if the initial speed V _o and the target speed V _n change each time the measurement is performed, complicated processing for setting the intermediate speed need not be performed each time.

Further, R _i is 100 × (1-1 / n)
^1/2 , 100 x (1-2 / n) ^1/2 , ..., 100 x (1-i / n
) ^1/2 , ..., 100 × (1 / n) ^1/2 , preferably in a sequence. Measuring and evaluating acceleration / deceleration performance by dividing the distance that a vehicle or the like moves from V _o to V _n into n equal parts and using the speed every 1 / n as an index.
This is because it is easy to obtain mechanically and statistically valid results.

The first reference intermediate speed V _a is selected in the range of 75 ≦ | (V _n −V _a ) / (V ₀ −V _n ) | × 100 ≦ 90, and the second reference intermediate speed V _a is selected. V _b is 30 ≦ | (V _n −V _b ) / (V ₀ −V _n ) | × 100 ≦ 65, where {(V _a −V _n ) ²⁻ (V _b −V _n ) ² } / (V It is preferable to select in the range of _o −V _n ) ² ≧ 40. Basically, it calculates the air run time t ₀ based on the time t _a that has reached the time-based actual mean deceleration and V _a between the first reference intermediate speed V _a and the second reference intermediate velocity V _b · Since it is displayed, V _a is a more appropriate measurement by selecting an intermediate speed that is a certain speed after acceleration / deceleration of the vehicle or the like enters a steady state and V _b is an intermediate speed before the end of the state. This is because the result can be obtained. However, the meaning of the formula in the drawing is that the distance traveled by the vehicle or the like between the first reference intermediate speed V _a and the second reference intermediate speed V _b is 40% or more of the distance between V ₀ and V _n. Means that is preferable. It is possible to avoid judging the overall acceleration / deceleration performance from the partial data.

In the sixth step, if the relationship of t _0i -k ₁ ≤t _{0 (i + 1)} ≤t _0i + k ₂ (k _{1 and} k ₂ are predetermined threshold values) is satisfied, It is determined that the variation of the free-running time t _0i is small, and if not, the individual free-running time t _0i
It is preferable to judge that the variation is large. t _0i and t
_{The fact that 0 (i + 1)} is significantly different is a good indicator that there is an abnormal fluctuation in the acceleration / deceleration performance.

In the seventh step, when it is determined that the variation is large, the fact is indicated, t _0b and t _0i (i = a
It is preferable to display the average value of +1, a + 2, ..., B). In this case, a person looks at the acceleration / deceleration performance curve and determines the subsequent treatment. However, although it is slightly abnormal, it is determined that the average value of t _0b or t _0i may be adopted as the regular t _0. It may be done.

The acceleration / deceleration performance measuring method and the measuring device according to the present invention can be applied to the measurement of various motion performances of various moving bodies as follows. Railway vehicle running brake performance / acceleration performance Vehicle running brake performance / acceleration performance Aircraft wheel braking performance Ship acceleration / deceleration performance Rotating machinery (pumps, fans, turbines, etc.) acceleration / deceleration performance

The acceleration / deceleration performance measuring device of the present invention comprises a speed detecting means for detecting the speed of the vehicle, an acceleration / deceleration detecting means for detecting the start of acceleration / deceleration of the vehicle, and a time point at which acceleration / deceleration of the vehicle is started. A plurality of intermediate speeds V ₁ , V ₂ , between the vehicle speed V ₀ and the desired vehicle speed V _n at the end of acceleration / deceleration ...
, V _n-1 and intermediate speed setting means for setting the first reference intermediate speed V _a and the second reference intermediate speed V _b (b> a) from among them, and the vehicle speed is accelerated / decelerated by the acceleration / deceleration detection means. Of the time (t ₁ , t) from when the start of is detected to when each intermediate speed set by the intermediate speed setting means is reached.
_2, and time measuring means for measuring ...), and a plurality of time measured by the intermediate speed calculating means a plurality of intermediate speed and the time measuring means is calculated by the calculation equation t _oi = t _a - | _{(t i -t a) × (} V o -V a) / (V
_a -V _i) | individual Sorahashi time based on _{t oi = (i = a +} 1, a + 2,
.., b>b> a), and whether or not the individual free-running time calculated by the individual free-running time calculation means is within a predetermined variation range. It is characterized by comprising a variation determination means and a result display means for visually outputting the determination result according to the determination result of the variation determination means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below with reference to the drawings and calculation examples. FIG. 1 shows a relative speed (vertical axis) and a time (horizontal axis) from when the vehicle to be measured is braked to when it is stopped by using the acceleration / deceleration performance measuring method according to one embodiment of the present invention. (Axis) is a graph showing the relationship with. The thick solid line drawn in the graph is a line in which A-B-CD-E-F-G-H-I is a plot of time and speed until the vehicle stops.
Although the brake command is issued at the time of A, there is a time delay, and the brake begins to work in earnest at the time of B or C, and the steady deceleration has started.

In FIG. 1, the vertical axis represents the value obtained by dividing the value obtained by dividing the vehicle speed V _i by the vehicle speed V _o before braking, that is, the relative speed. The horizontal axis represents the elapsed time after the deceleration command (brake command) is issued. The vehicle is gradually decelerated from the initial speed V ₀ to the target speed V _n = 0 (stop). Seven intermediate speeds V _{1 to} V ₇ are set between V ₀ and V _n , and the target speed is V _n = V
₈

In this example, the intermediate speed is V _i = V ₀
− (V ₀ −V ₈ ) × (100−R ₁ ) / 100 (R _i is a predetermined%
Value) is set according to the formula. Where R
_i is 100 × (1-1 / 8) ^1/2 , 100 × (1-2 / 8) ^1/2 ,
……, the sequence is 100 × (1-7 / 8) ^1/2 .
That is, R _i is as follows. R ₁ = 100 x (7/8) ^1/2 = 100 x 0.935 = 93.5 R ₂ = 100 x (6/8) ^1/2 = 100 x 0.866 = 86.6 R ₃ = 100 x (5/8) ^{1 / 2} = 100 x 0.796 = 79.6 R ₄ = 100 x (4/8) ^1/2 = 100 x 0.707 = 70.7 R ₅ = 100 x (3/8) ^1/2 = 100 x 0.612 = 61.2 R ₆ = 100 x (2/8) ^1/2 = 100 x 0.500 = 50.0 R ₇ = 100 x (1/8) ^1/2 = 100 x 0.354 = 35.4

Further, V _i is as follows because V ₈ = 0. _{V i = V 0 - (V} 0 -V 8) × (100-R i) / 100 = V 0 -V 0 × (100-R i) / 100 = V 0 -V 0 + V 0 × R i / 100 = V ₀ × R _i / 100 ∴V _i / V ₀ × 100 = R _i Therefore, in the case of the present embodiment in which the brake is applied from the initial speed V ₀ until the vehicle stops, when V _i / V ₀ is displayed as R _i , Will be equal.

If R _i is set to a predetermined value, even if the initial velocity V _o and the target velocity V _n change with each measurement, it is not necessary to perform complicated processing for setting the intermediate velocity each time. There is an advantage. The reason why R _i is a sequence of 100 × (1−i / n) ^{1/2 is} that the distance traveled by the vehicle from V _o to V _n (actual braking distance S _r ) is divided into n equal parts.
This is because it is preferable to analyze the braking performance by using the speed at each 1 / n as an index. Of course, R
_{It is also possible to set i} as a sequence of 100 × (1−i / n) and select the intermediate speed for each constant speed change.

Next, the intermediate speed V_i First criteria from
Intermediate measure V_a And the second reference intermediate speed V_b Select (b> a)
The second step to be selected will be described. V_a , V_b Is
In the later step, the free running time t_o When calculating
It is the speed. V_a Is the vehicle acceleration / deceleration entering a steady state
V at the time_b Is the intermediate speed V immediately before the end of the same state _i 
Is preferably selected. In this embodiment, V_a -V₂ 
(At that time R₂ = 86.6%), V_b = V₆ (At that time R₆ = 50
%) Is selected.

Incidentally, at the time point of V ₂ , if the speed-time characteristic curve of FIG. 1 is assumed to be a straight line, the actual braking distance S
_This is the time when 2/8 = 1/4 of _r . Also, V
The time point of _{6 is} the time point when the vehicle travels 6/8 = 3/4 of the same distance S _r . Thus, in this embodiment, the portion of 1 / 4-3 / 4 of the actual braking distance S _r, that is, half of the central part of the actual braking distance S _r, in other words, from the start effectiveness is vehicle brake until the vehicle stops We are trying to measure and evaluate the braking performance based on the section of half of the central part of the total distance. This section is suitable for measurement because the braking characteristics are relatively stable.

Various known measuring methods can be used for the third step of continuously measuring the speed of the vehicle and the fourth step of measuring the time required to reach each speed V _i .

Next, the fifth step of calculating the individual free-running time t _0i will be described. This individual free running time t _0i is the first
This means the idle running time corresponding to the time-based actual average deceleration β _ai from the reference intermediate speed V _a to the subsequent intermediate speed V _i . In this embodiment, it is calculated as follows. t _0i = t _a − | (t _i −t _a ) × (V ₀ −V _a ) / (V _a −V _i ) | = t ₂ − | (t _i −t ₂ ) × (V ₀ −V ₂ ) / (V ₂ −V _i ) | i = 3: t ₀₃ = t ₂ − | (t ₃ −t ₂ ) × (V ₀ −V ₂ ) / (V ₂ −V ₃ ) | = 6.7− | ( 8.2 −6.7) × (100−86.6) / (86.6−79.6) | == 6.7−2.9 = 3.8 (sec) i = 4: t ₀₄ = t ₂ − | (t ₄ −t ₂ ) × (V ₀ −V _{2) / (V 2 -V 4} ) | = 6.7- | (9.8 -6.7) × (100-86.6) / (86.6 -70.7) | = 6.7-2.6 = 4.1 ( sec) or less, calculated Likewise the Become. t ₀₅ = 4.0 t ₀₆ = 4.0

The meaning of this calculation will be described in detail. Figure 2
[Fig. 4] is a diagram showing a way of thinking when calculating t ₀₃ . In the figure, the vehicle brake characteristic curve ABCD is shown by a thick solid line. C is a point of speed V ₂ (first reference intermediate speed) and time t ₂ , and is a time point at which a short time has elapsed since the brake characteristics began to stabilize. D is a point of speed V ₃ and time t ₃ .
Considering the CD as a straight line, the individual free running time t ₀₃ in FIG.
To calculate. For that purpose, the time t ₂₀ corresponding to the length between the points C and L may be subtracted from t ₂ .

In FIG. 2, Z is the intersection of the horizontal line drawn from A (speed V ₀ ) and the line extending the straight line CD to the upper left. The length of the line AZ corresponds to the individual airspeed time t ₀₃ . The slope of the straight line CD is equal to the time-based actual average deceleration β _2-3 between V ₂ → V ₃ , and its value is given by the following equation. β _2-3 = (V ₂ −V ₃ ) / (t ₃ −t ₂ ) Using this, the LC length, that is, the time t ₂₀ is given by the following equation. t ₂₀ = (V ₀ −V ₂ ) / β _2-3 = (V ₀ −V ₂ ) / {(V ₂ −V ₃ ) / (t ₃ −t ₂ )} = (t ₃ −t ₂ ) ( _{V 0 -V 2) / (V} 2 -V 3)

Next, the sixth step of judging the variation of the individual free running time t _0i will be described. In this embodiment, t
_{0 (i + 1)} > t _0i +0.3 or t _{0 (i + 1)} <t _0i −0.2
When it is, it is decided that the variation is large. Large variation means that the curve of the brake characteristic curve is large. The reason why the variation threshold value is larger when t _{0 (i + 1)} is larger than t _0i is that the vehicle brake characteristic curve generally has such a tendency. Since the reverse tendency to the above is not so common, it is decided to detect the abnormality of the characteristic with a low variation threshold value and seek human intervention. In the case of the present embodiment, since the variation is within the above criteria, it is determined that the variation is small, and the individual free running time t ₀₆ = 4.0 when i = b = 6,
In the seventh step, it is displayed as the free running time.

Calculation of the distance-based actual average deceleration β _s will be described. First, the braking distance S is obtained. The method is to change the speed V from t = 0 to t _n when an acceleration / deceleration command is issued.
Integrate to. As the integrator for performing such integration, a conventionally used integrator can be used. Next, using the free-running time t ₀ obtained by the above calculation, the equation β _s = (V ₀ −V _n ) ²
The distance-based actual average deceleration β _s is calculated by / {2 × (S−t ₀ V ₀ )}.

When the braking distance S is calculated, it is possible to judge the sliding of the wheel on which the brake is applied, and at the time of sliding, the braking distance can be calculated based on the reference speed of the vehicle which is separately measured or set. As a method of determining the sliding of the wheels, for example, by measuring the speed of a plurality of wheels,
At the time of deceleration, there is a method of selecting the highest speed from among them as a reference speed of the vehicle and determining that a wheel having a speed equal to or lower than a speed obtained by subtracting a certain value from the reference speed is "sliding". Alternatively, the speed of the vehicle may be directly measured using a Doppler type speedometer or the like, and this speed may be used as the reference speed.

Next, an embodiment of the acceleration / deceleration performance measuring apparatus according to the present invention will be described with reference to FIGS. Here, FIG. 3 is a configuration diagram showing the configuration of the acceleration / deceleration performance measuring apparatus in the present embodiment. 4 and 5 are flowcharts showing the procedure of the control program for controlling the operation of the present apparatus, which is executed by the MPU used in the acceleration / deceleration performance measuring apparatus of the present embodiment.

As shown in FIG. 3, the acceleration / deceleration performance measuring device in this embodiment (hereinafter referred to as "this device").
Is a speed sensor 1 for measuring the speed of the vehicle, a waveform shaping circuit 2, a brake detection switch 3, and a time counting circuit 4
, The D / A converter 5, the display 6, the I / O circuit 7,
A printer 8 and a microprocessor unit (referred to as MPU) 9 are provided.

The speed sensor 1 according to the present embodiment comprises a magnetizing rotor 10 that rotates in association with the rotation of an axle and a reed switch 1.
1 and. The magnetizing rotor 10 is formed in a disk shape, and at least the peripheral portion is made of a magnetic member, and two magnetic poles are formed for each of N and S. A reed switch 11 is provided near the periphery of the magnetized rotating body 10. For example, when the N pole of the magnetized rotating body 10 passes near the reed switch 11, the reed switch 11 is provided. The contact of is changed from the open state to the closed state. Therefore, the opening / closing interval of the contacts of the reed switch 11 corresponds to the speed of the vehicle in which the present device is mounted.

The waveform shaping circuit 2 has the functions of waveform shaping and signal conversion for making the open / closed state of the reed switch 11 into a signal suitable for being input to the MPU 9 as a digital signal.

The brake detection switch 3 is interlocked with the start of a brake device (not shown), and is closed when the brake device is started. And MP
By detecting the closing of the brake detection switch 3, U9 determines that the brake device has started to operate (details will be described when the flowcharts shown in FIGS. 4 and 5 are described. ).

The time counting circuit 4 is a counting circuit for counting the elapsed time from the closing of the brake detection switch 3 (details will be described later), and outputs a pulse at a constant interval from the closing of the brake detection switch 3. It is like this. Then, by counting the number of output pulses of the time counting circuit 4 by the MPU 9, the elapsed time from the closing of the brake detection switch 3 is calculated.

D / A converter ("D / A" in FIG. 3)
5 is for converting display data in digital signal format (details will be described later) output from the MPU 9 into an analog signal necessary for displaying on the display 6. The display data converted by the D / A converter 5 is
Characters are displayed on the display 6.

An I / O circuit (abbreviated as "I / O" in FIG. 3) 7 is for converting the data output from the MPU 9 into a signal suitable for printing by the printer 8.
Data output from the MPU 9 (details will be described later) are printed by the printer 8.

The MPU 9 has a central processing unit, a read-only memory (ROM), an input / output port, etc., and is well known in itself, and executes a program based on the flowcharts (see FIGS. 4 and 5) described later. It is executed to perform the acceleration / deceleration performance measurement process described above.

FIG. 4 and FIG. 5 show flowcharts of programs executed by the MPU 9 described above.
Hereinafter, a series of procedures for measuring the acceleration / deceleration performance by the present device will be described with reference to FIG.

The MPU 9 turns on the start switch,
Execution starts from step 100, and next step 102
Then, the process proceeds to and the initial values of various variables necessary for measuring the acceleration / deceleration performance are set. Specific as being initialized in this embodiment, R ₁ to R ₈ is a constant that determines the intermediate speed, final velocity V _8, a variable i,
R _{1 to} R ₈ are the values described above, and the final speed V ₈ = 0.
And i = 1 are set.

After the initialization is completed, it is determined in step 104 whether the brake device has been started. In this embodiment, whether or not deceleration is started by determining whether or not the brake detection switch 3 is closed,
That is, it is determined whether or not the brake device has been started. Then, if it is determined that the brake device has not been started yet (NO), the same determination is repeated again, while if it is determined that the brake device has been started (YES), the process proceeds to step 106 to be described next. Processing is performed.

That is, the speed V ₀ of the vehicle at the time when the brake device is started is calculated. The signal input from the speed sensor 1 to the MPU 9 via the waveform shaping circuit 2 is input every time the vehicle equipped with this device travels a certain distance as described above. Is counted for, for example, one second at the time when the start of the brake device is detected, the speed V ₀ at that time is calculated. Then, after the speed V ₀ is calculated, the intermediate speeds V _{1 to} V ₇ are calculated in step 108.

The calculation of the intermediate velocity V ₁ ~V ₇ is as previously described _{V i = V 0 - (V} 0 -V 8) × (100-R
_i ) / 100 (however, in this embodiment, V ₈ = 0). Here, in the present embodiment, R _i (i = 1 to 7) is set at the time of initialization (step 102) using the constants described above in the description of the method. The specific calculation of the intermediate velocities V _{1 to} V ₇ has already been described in the description of the method, and thus detailed description thereof will be omitted here.

After the intermediate speeds V _{1 to} V ₇ are calculated, it is judged whether or not the speed of the vehicle equipped with this device has reached the intermediate speeds V _{1 to} V ₇ calculated in step 108. (Step 110). This determination is made from the intermediate speed V ₁ in this order, given if it is determined to have reached the intermediate speed V _i (i = 1 to 8), the predetermined intermediate speed V _i from the time the brake system is started The elapsed time t _i up to the time when is detected is determined (step 112). The elapsed time t _i is determined by the MPU 9 inputting the counting result of the time counting circuit 4. When one intermediate speed V _i and elapsed time t _i are thus determined, the variable i is increased by one (step 11
4) Other intermediate speeds V _i and elapsed times t _i are determined in the same manner as described above until the variable i reaches 8 (step 116).

[0043] Where all intermediate velocity V _i and the elapsed time t _i is determined, based on the calculated data is calculated for individual Sorahashi time t _oi (i = 8~8) is performed (step 118) . The physical meaning and specific process of calculating the individual Sorahashi time t _oi (i = 3~8) is already detailed description here Having described in the description of the method is omitted.

[0044] After the individual Sorahashi time t _oi (i = 3 to 6) are calculated, (see step 120 of FIG. 5) that is being determined whether these calculated data is in a predetermined range of variation. In this embodiment, it is determined that the variation is large when t _{o (i + 1)} > t _oi +0.3 or t _{o (i + 1)} <t _oi −0.2 is satisfied. If it is determined that the variation is large, a character display indicating that the variation is large is displayed on the display unit 6.
To be done. On the other hand, when the variation is not large (OK in step 120), the individual idle running time t _ob is printed on the printer 8 (step 124), and the series of measurement operations is completed (step 126). In the present embodiment, since the variation of the individual free running time t _oi does not exceed the above-mentioned standard, t _ob, that is, t _o6 is printed out.

In the present embodiment, the case of deceleration has been described as an example, but it is needless to say that the present invention does not need to be limited to this. For example, even in the case of acceleration, the present embodiment is basically the same. Needless to say, an acceleration performance measuring device can be realized in the same manner as. In this case, in order to detect the start of acceleration, instead of the brake detection switch 3 shown in FIG. 3, for example, a switch that opens and closes in conjunction with the accelerator pedal may be provided and used as the acceleration detection switch.

Further, in the present embodiment, when it is determined that the variation of the individual free-running time is not within the predetermined range, the display 6 simply indicates that the variation is large.
At this time, the printer 8 may simultaneously print the average value of the individual free running times and t _ob .

[Brief description of drawings]

FIG. 1 is a diagram showing a relative speed (vertical axis) and a time (from a brake applied to a stop) of a vehicle to be measured using the acceleration / deceleration performance measuring method according to one embodiment of the present invention. It is a graph showing the relationship with the horizontal axis.

FIG. 2 is a diagram showing a way of thinking when calculating t ₀₃ .

FIG. 3 is a configuration diagram showing a configuration of an acceleration / deceleration performance measuring device according to an embodiment of the present invention.

[Fig. 4]

FIG. 5 is an M used in the acceleration / deceleration performance measuring apparatus of the present embodiment.
It is a flowchart which shows the procedure of the control program for controlling operation | movement of this apparatus performed by PU.

FIG. 6 is a diagram showing a method for obtaining a free running time defined in JIS E 4007-1976.

[Explanation of symbols]

 1 speed sensor 2 waveform shaping circuit 3 brake detection switch 4 time counting circuit 5 D / A converter 6 display 7 I / O circuit 8 printer 9 microprocessor unit (MPU)

Front page continuation (72) Inventor Atsushi Nikaido 1-16-6 Kita-Otsuka, Toshima-ku, Tokyo Otsuka Building Inside Idonic Co., Ltd.

Claims (12)

[Claims] 1. A method of measuring the acceleration and deceleration performance by measuring the empty run time for acceleration and deceleration of the vehicle or the like from the initial speed V ₀ to the target velocity V _n; multiple between V ₀ ~V _n , V _n-1 for setting intermediate speeds V ₁ , V ₂ , ..., V _n−1 of the intermediate speeds; the first reference intermediate speed V _a and the second reference intermediate speed V _b (b> a) are selected from the above intermediate speeds. A second step of continuously measuring the speed of the vehicle or the like; a fourth step of measuring a time (t ₁ , t ₂ , ...) From the issuance of the acceleration / deceleration command until the intermediate speed is reached; the first reference intermediate velocity V _a, the speed reaching time t _a, and the intermediate speed _{V i (i = a + 1} , a + 2, ......, b), using the same speed reaching time t _i, for each _i, wherein t _{0i = t a - | (t} i -t a) × (V 0 -V a) / (V
sixth step of determining the variation of the resulting individual Sorahashi time t _oi;; where | _a -V _i) by the fifth step calculates the individual Sorahashi time t _oi when it is determined that the small the variation, the above equation In step 7, the individual free-running time t _ob calculated for i = b is displayed as a free-running time, and when the variation is determined to be large, a seventh step of displaying the fact; Measuring method. 2. The method of setting the intermediate speed according to the following formula: V _i = V _0- (V ₀ -V _n ) × (100-R _i ) / 100 (R _i is a predetermined percentage value). Acceleration / deceleration performance measurement method described. 3. The R _i is 100 × (1-1 / n) ^1/2 , 10
^{0 × (1-2 / n) 1} /2, ..., 100 × (1-i / n) 1/2,
.. The acceleration / deceleration performance measuring method according to claim ^{2, wherein} a sequence of 100 × (1 / n) ^1/2 is formed. 4. The first reference intermediate speed V _a is selected in the range of 75 ≦ | (V _n −V _a ) / (V ₀ −V _n ) | × 100 ≦ 90, and the second reference intermediate speed V _a is selected. V _b is 30 ≦ | (V _n −V _b ) / (V ₀ −V _n ) | × 100 ≦ 65, where {(V _a −V _n ) ²⁻ (V _b −V _n ) ² } / (V _The method for measuring acceleration / deceleration performance according to claim 1, wherein the range is such that _o −V _n ) ² ≧ 40. 5. In the sixth step, when the relationship of t _0i −k ₁ ≦ t _{0 (i + 1)} ≦ t _0i + k ₂ (k _1, k ₂ are predetermined threshold values) is satisfied, Determines that the variation of the individual free-running time t _0i is small, and if not, the individual free-running time t _0i
The method for measuring acceleration / deceleration performance according to claim 1, wherein the variation is determined to be large. 6. In the seventh step, when it is determined that the variation is large, to that effect, t _0b and t _0i (i =
The method for measuring acceleration / deceleration performance according to claim 1, wherein an average value of a + 1, a + 2, ..., B) is displayed. 7. The idling time t ₀ and the braking distance S (V obtained by each of the methods of claims 1 to 5 are integrated from t = 0 to t _n when an acceleration / deceleration command is issued. Value), the distance-based actual average deceleration β _s = (V ₀ −V _n ) ² / {2 ×
(S−t ₀ V ₀ )} is calculated. 8. The method according to claim 7, wherein when the braking distance S is calculated, the sliding of the wheel on which the brake is applied is determined, and the braking distance is calculated based on a separately measured or set reference speed of the vehicle during the sliding. Acceleration / deceleration performance measurement method. 9. A speed detecting means for detecting the speed of the vehicle, an acceleration / deceleration detecting means for detecting the start of acceleration / deceleration of the vehicle, a vehicle speed V ₀ at the time when the acceleration / deceleration of the vehicle is started, and at the end of acceleration / deceleration. desired multiple between the vehicle speed V _n intermediate velocity V _1, V _2, ......, V _n-1 and the first reference intermediate speed V from them _a and the second reference intermediate velocity V _b (b in>
The intermediate speed setting means for setting a) and the time (t ₁₎ from the time when the vehicle speed is detected by the acceleration / deceleration detecting means to the intermediate speed set by the intermediate speed setting means. , T ₂ , ......)
And time measuring means for measuring, from a plurality of time measured by a plurality of intermediate speed and the time measuring means which is calculated by the intermediate speed calculating means, calculation formula _{t oi = t a - | (} t i -t _a ) × (V _o −V _a ) / (V
_a -V _i) | individual Sorahashi time based on _{t oi = (i = a +} 1, a + 2,
.., b, b> a), and whether or not the individual free-running time calculated by the individual free-running time calculation means is within a predetermined variation range. An acceleration / deceleration performance measuring device comprising: a variation determination means; and a result display means for visually outputting the determination result according to the determination result of the variation determination means. 10. The acceleration / deceleration performance measurement device according to claim 9, wherein the acceleration / deceleration detection means is a switch element that opens and closes in conjunction with the start of a vehicle brake device or acceleration device. 11. The result display means includes a display means for displaying that the variation is large when the variation determination means determines that the individual free running time exceeds a predetermined variation range, and the variation determination means. When it is determined that the individual free-running time is within the range of the predetermined variation, the individual free-running time calculated for i = b among the plurality of individual free-running times calculated by the individual free-running time calculating means. A printing means for printing
The acceleration / deceleration performance measuring device according to claim 9, wherein the acceleration / deceleration performance measuring device comprises: 12. The result display means includes a display means for displaying a large variation when the variation determining means determines that the individual idle running time exceeds a predetermined variation range, and an individual idle running. Of the plurality of individual free-running times calculated by the time calculating means, the individual free-running time calculated for i = b,
The acceleration / deceleration performance measuring device according to claim 9, further comprising: a printing unit that prints an average value of the plurality of individual free running times calculated by the individual free running time calculating unit.