# 4.2 Working out of metrology security of system of diagnosing of availability index of product of electric equipment LTS.

Let's consider metrology security of synthesis of system of diagnosing on an example of an electric equipment of automatic telephone exchange. According to statistical data , on elimination of the arisen snags in an electric equipment it is necessary from 11 to 17 % of total amount of operations on THAT and TR.

As a rule, the basic share of refusals is necessary on ignition system, a storage battery and the generator with the relay-regulator.

On ignition it is necessary more than 40 % of all refusals on the drive with its systems; and snags in 80 % of cases serve in ignition system as the factor of heightening of expenditure of fuel on the average on 6 - 8 % and lowerings of power of the drive.

Let's consider an example of optimisation of metrology security of system of diagnosing of an electric equipment of vehicles.

For realisation of system of diagnosing of an electric equipment 3 variants of sets STD presented to tab. 4.1 are made. Here performances of compared variants of sets of measuring apparatuses for electric equipment diagnosing are reduced: a measuring error ratio to magnitude of tolerance zone D/T, with - relative cost of the control on j controllable parametre, To - the factor considering increase of productivity of the control on j controllable parametre. The first variant consists from STD having a minimum measuring error and the maximum cost. The second variant is collected from STD, possessing bolshej by an error in comparison with STD the first variant and smaller cost. In the third variant the preference is given STD with the big error and smaller cost, unlike other two variants.

Variants of realisation of system of diagnosing of electric equipment LTS. Table 4.1. № nl «Electric voltage of a direct current Force of a fixed electric current. A bent shaft rotational speed Electric resistance to a direct current the Initial advance angle of ignition Q Щ31 Щ31 Focus F10 Щ31 Focus ON 1. Д/Т* 0.01, ЛЯ=0.01, Д/Т=0,001, ДТ=0,005, ДТ*0,008, 1,89 с=0,6. К31 с=0,6 К=1 с=0.2, to =! с=0.б. KCH с=0.7, К*1 2. АВТОАС-ПРОФИ2 Д/Т=0,008, с=0,3, К=1 AUTOEXPERT - ПРОФИ-2 iVT=0,005, с~0,3, К=1 LVTOAS - НРОФИ-2 Д/Т=0,0008, с=0.3, К=1 STS-600 ДТ~0,002, с=0,12. KCH AUTOEXPERT - ПРОФИ-2 №0,016, сЧ.К=1 0,57 Э-242 Э-242 Э-242 Э-242 TAU-1000 3. АТ-0,005, ЛТ-0,005, ДТ=0,005, ДАТ=0,005, Д/Т=0,005, 0,975 с=1. К=1 с=1, К=1 с=1. To-! с=1. К=1 с=0.3. К=1 metrology performances of the measuring apparatuses used at

Realisations of system of diagnosing are reduced tab. 4.2-4.6.

Metrology performances of gauges of the electric

Voltages of a direct current Table 4.2 № p'p Type of SI measurement Limits, In the Basic error, % 1. Щ31 0 100 ±1 2. And the WTO Expert-P РОФИ2 0-1500 ±0.5 3. Э-242 0-40 ±0.5 Metrology performances of gauges of force

Fixed electric current Table 4.3 Jfe p/p Type of SI measurement Limits, And the Basic error, % 1.

Щ31 0-100 ±1 2. АВТОЛС-11РОФИ2 50-3000 ±0.5 3. Э-242 0-150 ±1 Metrology performances of gauges of a rotational speed of a bent shaft Table 4.4. № nfn Type of SI measurement Limits, ob'min the Basic error 1. Focus ON 100 - 6000 ±10 rpm 2. ЛВТОАС-11РОФИ2 20-6000 ±5 % 3. Э-242 0-10000 ±1 % Metrology performances of gauges of the electric

Resistance to a direct current Table 4.5 № p/p Type of SI measurement Limits the Basic error ^ 1. Ш31 0 JUkOm ±2 2. STS-600 0-4МОм ±1 3. Э-242 1 100 It ±1 Metrology performances of gauges of an initial advance angle of ignition Table 4.6 № Type of SI measurement Limits, the Basic pogresh p/p hailstones. nost 1. Focus F10-45, +45 ±0,5 hailstones 2. АВТОЛС-ПРОФИ-2 0-60 ±1 3. TAU-IOOO 0-180 ±1 %

Considering, that at diagnosing of availability index of product of an electric equipment of automatic telephone exchange five diagnostic parametres criterion (2.53) are checked will assume the following air With ^

+

0=mini —

(4.5)

V^max + ^2тах Qmax J R

71 ¦ \r '

(4.6)

R +Р WITH

Irnax • * 2 shah jfcmax at J

R 02

And ^dop ^ ' 005 '

Using expressions (2.21), we will receive:

* ft t, i.

[. \[. lf (U) f (!) f (n) f (R) f (y03) p (AU) p (&I) p (An) p {R) p (Ay03) R, =

-L, TH, - &Л

I g - f, t „S,

j... J j...}] f {U) f {I) f (n) f (R) f (y03) p (AU) p (AI) p (An) p (R) p (Ay03)

d (AU) d (AI) d (An) d (R) d (Ay03) d (U) dU) d (n) d (R) d (y03) d {AU) d (AI) d (An) d (R) d (Ay03) d (U) d (I) d {n) d (R) d {y03) '

¦ J, t, t, tk L =

(4.7)

- /j-Jf

[. ¦ j J - \\\...\mw) mmnyo3).

d (AU) d (Al) d (An) d (R) d (Ay03) d (lJ) d {i) d (n) d (R) d (y03) For inspection of execution of a condition of security of admissible reliability dependences of probabilities of errors of the first and second sort called by an operation error are constructed. From fig. 4.1 follows, magnitudes of errors of the first and second sort, called by the specified error, do not exceed acceptable values.

Fig. 4.5. Dependence PI and Р2 from a measuring error and a variation of the mean error for compared variants of realisation of system of diagnosing

Values Р1 and Р2 for compared variants of realisation

Table 4.7.

№ a variant of River R 2 1 0,005 0.0018 2 0,011 0,0033 3 0,016 0,0038 From the table it is visible, that by results of synthesis of system of diagnosing of an electric equipment of automatic telephone exchange by the most effective the variant of realisation №2 as the minimum of objective function Q (0,57) is thus observed is. It is ensured with a choice of highly functional gauges in aggregate with rather higher exactitude.