METHOD FOR DIAGNOSTICS OF APERIODIC CIRCUITS AND DEVICE WHICH IMPLEMENTS SAID METHOD Russian patent published in 1998 - IPC

FIELD: automatic control systems, in particular, for diagnostics of linear dynamic objects. SUBSTANCE: method provides detection both number of fault circuit and checking deviation of gain and time constant from nominal values. I-th tested circuit is described by equation , where is Laplace transform of circuit response to unit step excitation in domain of real variable α_i,, ki, Ti are tested parameters of circuit. Nominal values of parameters are detected preliminary by means of application of unit step excitation x(t)= 1(t) to inputs of certainly operable circuits, detection of circuit test time using equation , where is a priori estimation of time constant. Nominal gain value is detected as value of circuit output signal at end of testing interval . Nominal value of circuit time constant is measured by means of integration of its output signal with weight , where . Output signal of circuit is sent to first input of divider which second input receives output signal of integrator. Output signal of divider is sent to input of first amplifier with gain , which output signal is sent to first input of first adder, which second input receives positive voltage of unit amplitude. Output signal of first adder is sent to input of second amplifier with gain 1/α_i. After voltage from its output is read, it is equal to time constant. Output signal of second amplifier is sent to first input of second adder. Voltage at its second input is altered to achieve minimal absolute voltage value at output of adder. Resulted voltage at second input of adder is judged circuit nominal value . Output single of circuit is sent to first input of third adder. Voltage at its second input is altered to achieve minimal absolute voltage value at its output. Resulted voltage at second input of third adder is judged circuit nominal value . Then circuits are tested by means of running operations described above but for constant settings of . Output signal of second adder is sent to first tolerance checking system. Output signal from third adder is sent to second tolerance checking system. If at least one parameter of circuit to be tested is output of tolerance range, output signal of tolerance checking systems is set to one which marks fault circuit. Device for diagnosis of aperiodic circuits has three adders, integration unit, starting circuit, source of test unit signal, unit for generation of non-linear function, multiplication unit, dividing unit, four amplifiers, two tolerance checking systems with corresponding connections. EFFECT: increased functional capabilities, increased validity of diagnostics. 2 cl, 4 dwg