RU2514316C1 - Method of testing motor vehicle engine microprocessor control system for susceptibility to electromagnetic radiation of lightning discharge - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to electrical testing of electrical equipment for susceptibility to electromagnetic radiation. The method of testing a motor vehicle engine microprocessor control system for susceptibility to electromagnetic radiation, wherein the control system in the motor vehicle being tested is subjected to pulsed electromagnetic radiation using a lightning discharge generator. The test system is exposed to a given number of non-synchronised electromagnetic radiation pulses, wherein the number of electromagnetic radiation pulses is calculated using a formula.

EFFECT: solution enables more accurate estimation of electromagnetic resistance of the engine control system.

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Description

The invention relates to electrical tests for susceptibility to electromagnetic effects of a microprocessor-based engine control system (MPSUD) of a motor vehicle (ATS), in particular, to the effects of electromagnetic radiation created by a lightning discharge.

From Nemchenko Yu.S. Implementation of tests of stability of onboard aircraft equipment to transients caused by lightning [Text] / Yu.S. Nemchenko, V.V. Knyazev, I.P. Lesnoy, S.B.Somkhiev // 11th International Symposium on Electromagnetic Compatibility and electromagnetic ecology: proceedings of a symposium. - SPb .: LETI, 2011. - S.460-463, there is a known method of testing the susceptibility of technical systems to the electromagnetic effects of a lightning discharge, in which the tested technical means is subjected to the method of "cable injection" pulsed oscillating decaying effect, created by a generator with known parameters.

The disadvantages of this method is that the technical means is subjected to a pulsed oscillatory damping effect created by a generator, the frequency range of which is much narrower than the frequency range of the electromagnetic field of a lightning discharge. This method during testing does not provide a full assessment of the susceptibility of the MPSUD ATS to the effects of electromagnetic radiation created by a lightning discharge.

From MIL-STD-464. Department of defense. Interface standard. "Electromagnetic environmental effects requirements for systems." March 18, 1997 (p. 8), there is a known method for testing the susceptibility of technical systems to lightning discharges, in which the tested equipment is subjected to direct contact pulsed action, consisting of a series of bursts of synchronized current pulses created by a lightning generator with known parameters.

The disadvantage of this method is that the technical means is subjected to direct contact pulsed current, simulating a direct discharge on the technical means, which does not allow to evaluate the stability of the technical means to the effects of pulsed electromagnetic radiation created by a lightning discharge.

For the prototype of the proposed method adopted well-known from MIL-STD-464. Department of defense. Interface standard. "Electromagnetic environmental effects requirements for systems." March 18, 1997 (p. 9-10) a test method for the susceptibility of technical systems to pulsed electromagnetic radiation created by a lightning discharge, in which the tested technical means is subjected to a single pulsed exposure to electromagnetic radiation created by a lightning generator with known parameters.

The disadvantage of this method is that the technical means is subjected to a single pulsed exposure to electromagnetic radiation, which does not ensure that with a probability of P = 0.95 the pulse of electromagnetic radiation generated by the lightning generator in the most electromagnetically vulnerable time interval of the synchronization signal generated by the master disk, mechanically rigidly connected with the crankshaft, during which the synchronization of the MPSS occurs.

The objective of the proposed solution is to create a method for testing the MPSUD ATS for susceptibility to pulsed electromagnetic radiation created by a lightning discharge, which allows a more reliable assessment of the electromagnetic resistance of the MPSUD, which ensures (makes possible) the creation of the MPSUD resistant to electromagnetic pulsed radiation caused by a lightning discharge.

This problem is solved in the test method, in which the tested technical means is exposed to pulsed electromagnetic radiation created by a lightning generator with known parameters.

This problem is solved by the fact that the tested technical means is exposed to electromagnetic, pulsed, with a given number of unsynchronized radiation pulses created by a lightning generator with known parameters, and the number of electromagnetic radiation pulses generated by a lightning generator is selected from the condition

, $$N=\left[\frac{T}{\left({\tau }_{\mathrm{from}\mathrm{from}}-2{\tau }_{gR}\right)}\right]+\mathrm{one}$$

,

Where

T = 60 / n is the time of one revolution of the crankshaft of the engine,

τ _ss = 2 / n is the flow time of the synchronizing signal generated by the master disk mechanically rigidly connected with the crankshaft;

τ _gr - the duration of the pulse of electromagnetic radiation created by a lightning discharge;

n - steady engine speeds.

The minimum duration T _i.gr.min between pulses of electromagnetic radiation generated by a lightning generator is selected from the condition

T and _gr.min >> 60 / n.

Moreover

$${\tau }_{\mathrm{and}.g{R}_i}\ne {\tau }_{\mathrm{and}.g{R}_{i+\mathrm{one}}}$$

where i = 1, 2, 3, ..., N.

The invention is illustrated by the drawing of Fig. 1, illustrating the essence of the method, which consists in the probable hit of an unsynchronized signal of an electromagnetic radiation pulse generated by a lightning discharge in the most electromagnetically vulnerable time interval of the synchronization signal generated by a master disk mechanically rigidly connected to the crankshaft during which synchronization MPSUD. Figure 1 schematically shows: 1 - a signal of pulsed electromagnetic radiation created by a lightning discharge; 2 - a synchronizing signal generated by a master disk mechanically rigidly connected to the crankshaft; 3 - time flow of the synchronizing signal.

The claimed technical solution is based on the fact that the calculated number of non-synchronized pulses of electromagnetic radiation generated by a lightning generator acting during tests on automatic telephone exchanges with MPSUD is sufficient to hit at least one electromagnetic pulse generated by a thunderstorm generator with probability P = 0.95 discharge, in the most electromagnetically vulnerable time interval of the flow of the synchronizing signal generated by the master disk, mechanically rigidly connected with the crankshaft during which synchronization occurs.

The invention is implemented by the following sequence of actions:

1. The calculation determines the number N of pulses of electromagnetic radiation created by a lightning discharge generator.

2. ATS with MPSUD is located under the field-forming system, which _generates pulses of electromagnetic radiation simulating a lightning discharge at non-synchronized time intervals T and _gr .

3. During tests on automatic telephone exchanges with MPSUD, N non-synchronized pulsed effects of electromagnetic radiation of a lightning discharge are produced.

4. If during testing no violations of the MPSUD are registered, then it is deemed resistant to the effects of electromagnetic radiation created by a lightning discharge. In the case of registration of violations of the MPSUD, is it recognized as unstable to electromagnetic radiation? created by lightning.

Tests by the present method provide the creation of MPSUD with effective up to the required threshold of electromagnetic resistance protection from electromagnetic radiation created by a lightning discharge.

Claims (1)

A method of testing a microprocessor engine control system (MPSUD) of a motor vehicle (ATS) for susceptibility to electromagnetic effects created by a lightning discharge, in which the tested MPSUD as part of the ATS is subjected to pulsed electromagnetic radiation generated by a lightning generator with known parameters, characterized in that the tested MPSUD are exposed to a predetermined number of unsynchronized pulses of electromagnetic radiation created by a thunderstorm generator discharge, while the number of pulses of electromagnetic radiation is selected from the condition:

,
Where
T = 60 / n is the time of one revolution of the crankshaft of the engine,
τ _ss = 2 / n is the flow time of the synchronizing signal generated by the master disk mechanically rigidly connected with the crankshaft;
τ _gr - the duration of the pulse of electromagnetic radiation created by a lightning discharge;
n - steady-state engine speed,
the minimum duration T _i.gr.min between pulses of electromagnetic radiation created by a lightning generator is selected from the condition
T and _gr.min >> 60 / n,
Where

,
Where
i = 1, 2, 3, ... N.