JPH0116165Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention uses a digital arithmetic circuit as the preprocessing section.
This invention relates to a single hybrid controller in which the calculation section of a controller, such as a PID calculation section, is configured with an analog calculation circuit.

For hybrid controllers, digital calculation is more advantageous for complex calculation processing (preprocessing such as square root calculation, addition, multiplication, etc.), whereas PID calculation is quick response and can provide continuous output, and it also Since it is advantageous to configure the integral hold circuit in manual mode such as when using an analog calculation circuit, the preprocessing section is configured with a digital calculation circuit, and the calculation section of the controller is configured with an analog calculation circuit. are doing.

In this type of hybrid controller,
If the manual/automatic changeover switch is switched to manual mode, e.g. ``OPEN'' or ``CLOSE''
When a manual operation switch such as
The voltage output from the analog arithmetic circuit is adjusted. However, in the conventional hybrid controller, the manual mode was simply changed by switching the manual/automatic switch, so if the controller is left in the manual mode for a long time, the integral hold circuit that outputs the manual output signal is not used for offset or integral operation. The drawback was that the output could drift due to capacitor leakage, making it impossible to control it properly.

The object of this invention is to provide a hybrid controller which eliminates the above-mentioned drawbacks of the conventional device and which can compensate for drift in the output of the integral hold circuit and perform appropriate control.

In order to achieve the above objectives, the hybrid controller of this invention has a function that when the manual/automatic changeover switch is switched to manual mode, and when the manual operation switch such as ``OPEN'' or ``CLOSE'' is terminated in manual mode. At times, the output of the analog arithmetic circuit is AD converted and stored in the digital arithmetic circuit. From then on, this stored value is compared with the output value of the analog arithmetic circuit, and analog arithmetic is performed based on the comparison result. I am trying to correct the output of the circuit.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

The drawing is a block diagram of a hybrid controller showing one embodiment of this invention.

In the figure, the hybrid controller is composed of a regulator calculation section 1 and a preprocessing section 2. Further, the regulator calculation section 1 shown here includes operational amplifiers 3 and 4.
These circuits themselves have no characteristic points.

R ₄ is a proportional band adjuster and R ₅ is an integral gain adjuster. 5a and 5b are input terminals to which a deviation input voltage is applied, and 6 is an adjustment amount output terminal. Further, 7 is a manual/automatic changeover switch provided between operational amplifiers 3 and 4, 8 is a "CLOSE" switch, and 9 is a manually operated switch for "OPEN".

The preprocessing unit 2 includes a multiplexer 10 that receives a plurality of analog signals as input, and an A/D converter 1 that converts the output signal of the multiplexer 10 into a digital value.
1. A CPU 12 that receives a digital value from this A/D converter and performs storage or arithmetic processing; a D/A converter 13 that converts the digital value output from the CPU 12 into an analog value; Multiplexer 1 receives and outputs the analog signal of
It is composed of 4th grade. In addition, multiplexer 14
The output of is applied to input terminals 5a and 5b of the regulator calculation section 1.

A comparator 15 receives the output of the operational amplifier (integral hold circuit) 4 and the output of the multiplexer 14 at its input terminals, and compares the two. The output of this comparator 15 is the insulated gate field effect transistor 1
6. It is connected to the inverting input terminal of the operational amplifier 4 via a resistor _R7 . Further, the output end of the operational amplifier 4 is connected to one end of the input of the multiplexer 10. 17 is an AND gate circuit, and when the signal is H (high),
In other words, when cpu12 is not faulty, cpu12
The timing signal cp applied from the insulated gate field effect transistor 16 is applied to the gate electrode of the insulated gate field effect transistor 16.

In the hybrid controller configured as described above, first, when the manual/automatic changeover switch 7 is set to the automatic mode (terminal A), the deviation voltage applied to the input terminals 5a and 5b is applied to the operational amplifier 3, etc. PI is calculated in the circuit, amplified by the operational amplifier 4, and an analog signal output is derived from the output terminal 6. In this case, the analog signal voltage output from the output terminal 6 changes in accordance with the change in the deviation voltage applied to the input terminals 5a and 5b.

When the manual/automatic changeover switch 7 is set to manual mode (M terminal), the output of the operational amplifier 4 at the time of the changeover setting is passed through the multiplexer 10 to the A/
The data is converted into a digital value by the D converter 11, and taken into and stored in the memory built into the CPU 12. That is, the output of the operational amplifier 4 at the time of switching from automatic to manual is digitally held in the memory of the CPU 12 as a reference value. Thereafter, the reference value stored in the CPU 12 is converted into an analog value by the D/A converter 13, and is applied to one input terminal (inverting terminal) of the comparator 15 via the multiplexer 14. On the other hand, since the output of the operational amplifier 4 is applied to the other end (non-inverting end) of the input of the comparator 15, the comparator 15 derives an output according to both inputs. In addition, the gate of the insulated gate field effect transistor 16 is connected to the CPU 12.
When the DOWN signal is "H", that is, when the CPU 12 is operating normally, and neither the "CLOSE" switch 8 nor the "OPEN" switch 9 is operated, the signal cp is output to the AND gate circuit 17. added periodically. this signal
While cp is applied, insulated gate field effect transistor 16 is turned on and the output of comparator 15 is applied to the inverting input of operational amplifier 4. Even if the output of the operational amplifier, ie, the integral hold circuit 4, drifts and differs from the reference value stored in the CPU 12, the output of the comparator 15 performs correction until the difference disappears.

When operating the "CLOSE" operation switch 8 or "OPEN" operation switch 9 to increase or decrease the output of the operational amplifier 4 in manual mode, the output of the operational amplifier 4 will increase or decrease depending on the operation time. At the timing when the operation of "CLOSE" operation switch 8 or "OPEN" switch 9 is completed, the output of operational amplifier 4 is transferred to multiplexer 1.
0, and is stored in the CPU 12 as a digital value via the A/D converter 11. Then, this stored digital value becomes a new reference value, and the reference value is applied to one input terminal of the comparator 15 via the D/A converter 13 and the multiplexer 14, as in the manual mode setting. Thereafter, the output of the comparator 15 is applied to the inverting input terminal of the operational amplifier 4 via the insulated gate field effect transistor 16, as in the manual mode setting described above, so that the output of the operational amplifier 4 matches this reference value. Corrections are made.

As described above, according to the hybrid controller of this invention, when the manual/automatic changeover switch is switched to manual mode and when the operation of the manual operation switch is completed in manual mode, the output of the analog calculation circuit is converted into AD and analog calculation is performed. Analog calculation is a method that is stored in the circuit and then compared with the output value of the analog calculation circuit using this stored value as a reference, and the output of the analog calculation circuit is corrected based on the comparison result. Even if a drift factor occurs in the integral hold circuit of the circuit, it can be corrected and an output free of drift can be obtained as a result, making it possible to perform appropriate control.

In addition, the output of the analog arithmetic circuit is compared with the reference value stored and held in the digital arithmetic unit and D/A converted by the comparing means, and the output is compared with the signal indicating the normality of the digital arithmetic unit and the logic of the signal of a predetermined period. Since the signal is input to the correction means via a switching element that is turned on based on the product input, it is possible to always perform appropriate drift correction.

[Brief explanation of the drawing]

The drawing is a block diagram of a hybrid controller showing one embodiment of this invention. 1; Adjuster calculation unit, 2; Preprocessing unit, 3, 4; Operational amplifier, 5a, 5b; Input terminal, 6; Output terminal, 7; Manual/automatic changeover switch, 8;
"CLOSE" manual operation switch, 9; "OPEN" manual operation switch, 10, 14; multiplexer,
11; A/D converter, 12; cpu, 13; D/A
Converter, 15; Comparator, 16; Insulated gate field effect transistor, 17; AND gate circuit.

Claims (1)

[Claims for Utility Model Registration] Pre-processing is performed in a digital calculation section, the controller calculation section is composed of an analog calculation circuit, and the analog calculation circuit section is equipped with a manual/automatic changeover switch and a manual operation switch. In the hybrid controller, a part of the analog calculation circuit is configured as an integral hold circuit by switching the switch to the manual side, and the output of the hold circuit is increased or decreased by the manual operation switch, wherein the manual/automatic changeover switch means for retaining and storing the output of the analog arithmetic circuit section in the digital arithmetic section when the manual operation switch is switched to manual mode and when the operation of the manual operation switch is completed while the switch is switched to manual mode; D/A conversion means for converting and outputting the analog value into an analog value; means for comparing the output of the analog arithmetic circuit with the stored value outputted via the D/A conversion means; and the digital arithmetic switching means for deriving the output of the comparing means by turning on the logical product input of a signal indicating that the section is normal and a pulse signal of a predetermined period; and a switching means for receiving the derived output of the comparing means; A hybrid controller comprising means for correcting manual drift of the integral hold circuit section based on the output.