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 Wysłany: Czw 9:52, 02 Gru 2010 Temat postu: mbt schuhe auslaufmodelle Water heater digital the |
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Water heater digital thermostat type strong emission factors and control structure
Can be obtained from the response curve, after more testing and transfer function analysis, we recognize that the working process of water heater is a large time delay of the multi-order inertial system, and nonlinear and time variability. ⑧ common regulator of a, P regulate the output of proportional controller is proportional with the deviation between the end of the process there is more than poor,[link widoczny dla zalogowanych], increase the proportion of easy to produce oscillations, with a small percentage of the speed is too slow. b, PI regulator proportional integral regulator is characterized by a deviation of its output is proportional to the integral, integral role in the transition process it demonstrated poor, for delay is small, little change in the system load. c, PID regulator in the proportional integral controller based on the increase in the differential part, the effect would be significantly improved capacity lag. For load changes, lagging slightly larger capacity, high quality requirements of the control system. As mentioned earlier, water heater flow control process is a wide range of load changes (pressure 0.2kg/cm2 ~ 5kg/cm), requires high quality control (fast, accurate), the larger delay of the multi-order inertial system, So more than a few in the analog controller is not ideal. We test, the actual situation as well. PID regulator with better performance, the system is still a large overshoot, and slow to follow. ④ Differential regulation of the first PID control system using PID regulator overshoot large, the reasons for a long transition process, is to control the delay of the large object, the process control problem is one of the most difficult. To solve this problem, the large number of tests,[link widoczny dla zalogowanych], made 9 shows a block diagram of the program. t ℃ It ℃ l thirty-two. Time to time differential forward PID block diagram of Figure 10 compared with the previous shows, the main part of the program is still a 42 * PID control program, the special part of Canada in the detection of a differential link. We call this control method is called differential forward of the PID regulator. After tests proved that the use of the gas water heater control system,[link widoczny dla zalogowanych], the overshoot is significantly reduced, following the speed has improved significantly. Experimental curve shown in Figure 10. Theoretical analysis of this phenomenon is as follows (derivation omitted): Let the transfer function of the controlled object W ∞ (s) = l (c ÷ (TS + I) ÷ (T2S + I), set the PID transfer function disturbances to w ∞ (S) = l (c (TS +1) (Tm +1) e-xs ÷ [T1SW0 (S) + K (T1S +1) (Tm +1) e-'rs], set the disturbance PID micro-branches under the transfer function of w (S) = K (Ts +1) e A ÷ [TSW. (S) + K) (Ts +1) (Tm +1) e I]. Comparison of w., ( s) and w Tuo (s) can be seen that the differential set disturbances than conventional PID control scheme first program, less a zero-pole Z =- I / Tn, so small overshoot, follow the speed is inevitable . ⑤ differential from the first PID regulator than is differential established after the first PID control model, can have their typical Kc, T, T. solidification parameters to the microcontroller's memory, but the user vary the conditions of use water heaters, high and low pressure, heating value size, water pressure varies; In addition, the temperature sensor and the ratio of the inertia valve is also different. Obviously with a fixed set of PID parameters, it is difficult to obtain the desired effect, where the specific user. To this end, we used the following automatic optimization program in the hardware to set a switch, water heater installed after the location of this switch to self-tuning, the program automatically sets the temperature of a few are represented, and then PID parameters based on typical, in the automatic adjustment recorded in the transition overshoot , the transition time and the oscillation period, the default rules automatically increase or decrease by the amount of PID, and then recorded. for more than a dozen or even dozens of the process, from selecting the best. complete instructions through the LED, prompts to install the service personnel will switch back. ⑤ software flow control of the microcontroller core is a discrete time control systems, and should therefore be first self-tuning PID regulator differential transfer function of a differential equation for the operator to facilitate the best and then converted to mathematical expressions incremental pursuant to which type code diagram and procedures. software main process shown in Figure 11. V. CONCLUSIONS I design according to the above, the development of several digital thermostat products, the basic one will be able to meet the preset targets, due to emphasis on the reliability of the development process ,[link widoczny dla zalogowanych], electrical safety and gas safety,[link widoczny dla zalogowanych], cost and market adaptation designed to ensure a satisfactory return after product launch. References: (1) Tongji University, gas combustion and its application. China Building Industry Press .2000. ( 2) Zhang Weihua, etc., domestic gas burning appliances electronic controller. China Standard Press .1997.
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