4results about How to "Reliable control method" patented technology

This invention discloses a forklift safety speed limiting system, including a safety speed limiting switch, a gearbox control board, and a gear shift lever. The gear shift lever has first and second output ports, and the gearbox control board has first and second input ports. The second output port is electrically connected to the second input port through a first actuator, the first output port is electrically connected to the first input port through a second actuator, and the second output port is electrically connected to the first input port through a third actuator. The opening and closing of the safety speed limiting switch changes the on / off state of the first, second, and third actuators. The first and second actuators are normally closed, and the third actuator is normally open. When a low level is input to the second input port, the gearbox operates in a low gear; when a high level is input to the second input port, the gearbox operates in a high gear. This invention also discloses a forklift with a forklift safety speed limiting system. This invention does not require modification of the vehicle control program or gearbox control program for speed limiting, thus improving forklift safety.

The invention discloses a control method, a control device and an LLC resonant converter, and the control method comprises the steps: obtaining a feedback signal representing the size of an output electric parameter of the LLC resonant converter, comparing the feedback signal with a reference electric parameter, and taking a comparison result as a charge quantity given value; an electric signal of the magnitude of the electric charge accumulated by the resonance circuit is obtained cycle by cycle, the electric signal is processed to serve as an electric charge sampling value, and the electric charge accumulated by the resonance circuit is the electric charge accumulated by the resonance circuit within the pulse width overlapping time of the driving signals of the first bridge arm and the second bridge arm; and comparing the electric charge quantity sampling value in the current period with the electric charge quantity given value period by period to generate a control signal, and controlling the on and off of the two switching tubes in the first bridge arm according to the control signal. According to the invention, the problem of poor dynamic response of the phase-shift LLC resonant converter can be improved.

This utility model relates to a toilet equipped with a dual-membrane negative pressure collector. The dual-membrane negative pressure collector has a collection chamber, an inlet chamber with a collector inlet, and an outlet chamber with a collector outlet within its housing. A first valve sealing pair is provided between the inlet chamber and the collection chamber, and a second valve sealing pair is provided between the collection chamber and the outlet chamber. The collection chamber is equipped with a gas distribution valve. The first valve sealing pair is a completely sealed pair when closed, including a first sealing port and a first sealing diaphragm. The second valve sealing pair is a partially sealed pair when closed, including a second sealing port and a second sealing diaphragm. Both the first and second sealing diaphragms are curved surfaces bulging towards their respective sealing ports. When this collector is applied to toilet waste disposal, its collector inlet is connected to the toilet's waste outlet, and its collector outlet is connected to a negative pressure pipeline. This utility model can reduce negative pressure consumption while reducing noise, construction costs, and other increases in operating costs.

The application belongs to the technical field of electric-gas servo control, and discloses a control method for enhancing robust anti-interference of a voice coil motor direct drive system. S1, a dynamic equation, a model error and a state equation of the voice coil motor direct drive system are established; S2, the lumped interference is expanded into an additional state variable to update the state equation, a condition that an extended state anti-interference observer and an estimation error thereof satisfy is set on the basis of the updated state equation, and the estimation of the lumped interference is calculated by using the extended state anti-interference observer; S3, a tracking error and an auxiliary error signal are set, a controller for enhancing robust anti-interference is constructed, and a difference between the estimation of the lumped interference and the lumped error is compensated, so as to realize the control of the voice coil motor direct drive system. By the application, the selection limit of a robust gain parameter is reduced, and the control precision and the robustness of the system are ensured in the case that the system suffers from strong interference.