Digital identifier of accumulators charge parameters

FIELD: automatic control.

SUBSTANCE: device has first and second analog-digital converters, first and second coefficients forming blocks, first and second multiplication blocks, counter, first and second integrator, control effect forming device, division block, buffer and registering block, while coefficients forming blocks are made in form of digital filters and all remaining blocks of device are made digital.

EFFECT: higher precision, higher resistance to interference.

1 dwg

 

The invention relates to automatic control, in particular to a device identification of the parameters of nonlinear inertial objects, and can be applied in control systems, identification in real time, including for adaptation to external conditions in the process of charging the batteries.

In real conditions safely fast charge Nickel-cadmium and Nickel-metal hydride battery has a wide range of parameters, which depend on many factors (temperature, voltage fluctuation mains, industrial noise in the measuring circuits, and so on). (Article "Smart" charger for Ni-Cd batteries. "Radio", No. 1, 2001, p.72). Identification of parameters (charge current and battery voltage) using a specialized processor that includes analog-to-digital Converter (ADC)allows to adequately identify the end of the optimal charging. The disadvantages of this device include the need for reprogramming of the optimal control period, disconnect the battery from the charging circuit at the time of measurement of the second parameter. This significantly reduces the performance of the adaptation process. The process of charging the batteries in an industrial environment is exposed to various industrial interference. Constant is e impact on the scheme charger a variety of random noise, including pulse type, reduces the precision of the control circuit of the date of termination of the battery charging.

A device identification of the parameters of nonlinear object in the regime close to the optimum, in which there is no need to use a specialized computing device and reprogram it in manual mode (as the USSR №930266, G 05 B 23/02, 23.05.82). It allows real-time to identify the complex parameters of the investigated object, for example the time constant Ti=Ri*itaking into account the nonlinearity characteristics of the controlled object, and increases the accuracy in the General case of non-stationary parameter Ti(t). The disadvantages of this device are the need of the excitation of the investigated object specially formed symmetrical test signal and low noise analog aperiodic filter used for the continuous formation of the coefficients of the algebraic equation.

Closest to the proposed device identification time constant of the nonlinear object (A.S. USSR №991377, G 05 B 23/02, 23.01.83), which allows for continuous monitoring and measurement of the complex Ti(t) in normal operation with random input signal. It contains per the first and second blocks forming coefficients, the first and second blocks of multiplication, the counter, the first and second integrators, the imaging unit control the unit and the recording unit, and outputs the first block forming factors connected respectively to the first inputs of the first and second multiplier units whose outputs are connected to inputs of respective integrators, and the outputs of integrators with input unit, the output of which is connected to the input of the recording unit, the first output of the second processing unit factors connected to the input of the shaper control, the output of which is connected to the input of the counter.

A disadvantage of this device is low immunity, especially to interference pulse type, which reduces the precision of the estimate of the end of charging the batteries, and the need for periodic adjustment of parameters aperiodic analog filters used as blocks for continuous formation of the coefficients of algebraic equations for the unknown complex parameters technology battery charge.

The present invention provides for obtaining a technical result consists in increasing the accuracy and noise immunity of the identifier.

The invention consists in that the authentication device containing first and second blocks forming coefficients, the first and second blocks of multiplication, the counter, the first and second integrators, the imaging unit control the unit and the recording unit, and outputs the first block forming factors connected respectively to the first inputs of the first and second multiplier units whose outputs are connected to inputs of respective integrators, and the outputs of integrators with input unit, the output of which is connected to the input of the recording unit, the first output of the second processing unit factors connected to the input of the shaper control, the output of which is connected to the counter input is entered first and the second analog-to-digital Converter and the buffer, and the inputs of the first and the second analog-to-digital Converter are used by the device inputs and outputs connected to respective blocks the formation of the coefficients is made in the form of digital IIR filters, the second output of the second processing unit factors connected to the first input buffer, a second input connected to the output of the counter, and the output buffer with the second inputs of the first and second multiplier units and all other units of the digital device is made.

The drawing shows a diagram of the device. It contains analog-to-digital converters 1 and 2, the inputs of which are relevant inputs Y(t) and X(t) indicates Ista, blocks 3 and 4 forming the coefficients of the algebraic equations for the unknown non-stationary complexes of the battery in the process of an accelerated charge, made in the form of digital IIR filters by the scheme conveyor-type, the first and second blocks multiplying 5 and 6, the first and second integrator 7 and 8, unit 9, the recording unit 10, the imaging unit control 11, the counter 12 and the buffer 13.

The input signal X(t) of the controlled object (schema battery) is proportional to the voltage (U3(t)+Un(t)], where Un(t) - noise AC, Y(t) is the controlled output signal of an object is proportional to the current in the charging circuit. Value L(t) is a binary number proportional to the reference voltage. The device operates as follows.

Controlled input X(t) and output Y(t) analog random signals in normal operation (battery charging) of the object without excitation special test signal fed to the ADC inputs 1 and 2, the outputs of which are connected in parallel with the respective first and second inputs of digital IIR filters 3 and 4, which are used for discrete-forming factors.

The second block 4 forming coefficients generates a signal U0(tiand C0(ti)=dU0 (ti)/dtiand the first unit 3 forming coefficients produces signals C0(tiand C1(ti)=dCo(ti)/d ti.

Under certain parameters, units 3 and 4 forming the coefficients of the signals U0(tiand U1(ti) practically coincide with controlled signals X(ti) and Y(tirespectively.

The received signals allow you to convert the nonlinear differential equation describing the object

Tj*dy/dt+y(t)=Fj[x(t)], (1)

where x (t) is the input random signal;

y(t) - output signal;

Tj=Rj*j- time constant, [s];

Rjand Cjthe resistance and capacitance in the circuit of the battery;

Fj- one continuous nonlinear function to the following:

Tj*C1(t1)+C0(ti)=Fj[U0(ti)]. (2)

Signals Ci(tiand U0(ti) additionally modulated by multiplying the signal U1(ti), is proportional to the first derivative of the input random signal X(ti), and integrating on the interval of time from tito ti+1and in these moments of time the signal U0(ti) passes through the reference level Ue(ti)that is recorded by the imaging unit 11 of the control action, to separate inputs of which is about the signals U 0(tiand-Ue(ti), and the output connected to the counter input register N such transitions, change the sign function Sign [U0(ti)-Ue(ti)].

The buffer 13 is opened and closed by the output signal of the counter 12. The right side of equation (2) in this case vanishes, so that you can determine the complex parameter battery charging time constant Tj(ti), which characterizes the inertia of the object.

Signals from the digital outputs of the integrators 7, 8 are fed to the unit 9 and at time ti+1when [U0(ti)-Ue(ti)]=0 or passes through zero, or N times such moments at the output of the unit is logged value of time constant Tj(ti) taking into account the nonlinear characteristics of the object.

The proposed digital ID allows without additional reconfiguration of blocks forming factors, multiplier units, integrators and unit during normal operation with random input signal with high accuracy to determine the parameters of the battery charging in the presence of industrial interference.

Digital ID settings charging the batteries, containing the first and second blocks forming the coefficients of the first and second blocks of multiplication, the counter, the first and second and territory, the driver control action, the unit and the recording unit, and outputs the first block forming factors connected respectively to the first inputs of the first and second multiplier units whose outputs are connected to inputs of respective integrators, and the outputs of integrators with input unit, the output of which is connected to the input of the recording unit, the first output of the second processing unit factors connected to the input of the shaper control, the output of which is connected to the input of the counter, characterized in that it comprises first and second analog-to-digital Converter and a buffer, and the inputs of the first and second analog-to-digital converters are the inputs of the device and outputs connected to respective blocks the formation of the coefficients is made in the form of digital IIR filters, the second output of the second processing unit factors connected to the first input buffer, a second input connected to the output of the counter, and the output buffer with the second inputs of the first and second multiplier units and all other units of the digital device is made.



 

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