Non-disturbance switching control loop and control method of single solenoid valve

Abstract

The invention relates to an unperturbed switchover control circuit and a control method of a single electric control electromagnetic valve. The circuit comprises external stable voltage (1) and ground GND (2). A switch button SK (3) is connected in series with a first relay SR (4) to form a line I; a second relay SR1 (6) is connected in parallel with a sixth relay HR1 (7) to form a line X; the line X is connected in series with a remote control signal (5) to form a line II; a local switch button K (10) is connected in parallel with a seventh relay HR2 (11) to form a line XI; the line XI is connected in series with a fourth relay SR3 (12) to form a line III; a reset switch button G (8) is connected in parallel with a third relay SR2 (13) to form a line IV; and the circuit can achieve unperturbed switchover from remote control to local control. When the local control is switched over to the remote control, a remote control system tracks a field state, thereby achieving the advantage of the unperturbed switchover among three control modes.

Description

technical field [0001] The present invention relates to the field of the composition of local control system and remote computer control system, more specifically, the non-disturbance switching control loop of single solenoid valve, and also relates to the control method using this control loop. Background technique [0002] Conventional industrial control systems are composed of local control systems and remote computer control systems. The local control system (on the local control cabinet) can select local and remote control modes. When one of the control modes is selected, the other control mode loses control of the device. Similarly, in the software design of the remote computer control system, it is also necessary to set a remote automatic and manual switch. After one control mode is selected, the other will be invalid. (Such as figure 1 shown); in normal operation, the remote automatic control mode is used, local control and manual control are only necessary supple...

AI Technical Summary

Problems solved by technology

In many projects, the design and supplier did not pay attention to this point. When the single solenoid valve is switched during operation, it often causes unexpected jumps of the controlled object, which will cause adverse consequences to the control equipment and process flow.

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