48results about How to "Change duty cycle" patented technology

The invention discloses a method for controlling an anti-lock system of a four-hub-motor drive electric car free of hydraulic braking, and relates to the field of automotive electronic control. In each control stage, braking force distribution of a front axle and a rear axle of a vehicle and reverse braking, regenerative braking, reverse-regenerative coordinating braking and forward driving of an in-wheel-motor are related. A logic threshold control method is adopted in ABS control, the slip rate (S) is compared with a set threshold value, the value and the direction of input voltage of the motor are controlled so that the forward driving, the reverse braking and the regenerative braking of the motor can be achieved, and accordingly wheel lock is prevented. The slip rate of a wheel is controlled near a theoretical value, the ground attachment coefficient is utilized to the maximum extent, and safe braking is achieved.

The invention relates to a water blowing method and a water blowing device used for an electrophoretic coating production line. The invention aims at providing a method and a device which can complete water blowing operation before a coated part enters a drying oven to reduce the production cost and ensure the quality of the coated part. According to the technical scheme, an electrophoretic coating water blowing device comprises at least one water blowing mechanism, wherein each water blowing mechanism comprises a base, at least one pillar, at least one beam, a group of spraying nozzles, at least one cross sliding platform and a driving mechanism for the cross sliding platform; and the pillar is vertically fixed on the base, the beam is installed on the pillar through the cross sliding platform and arranged perpendicular to the pillar, a longitudinal sliding rail of the cross sliding platform is fixed on the pillar, a transverse sliding rail of the cross sliding platform is fixed on the beam, and the group of spraying nozzles is installed on the beam and arranged along the length direction of the beam. An electrophoretic coating water blowing method comprises the following steps: (1) air blowing: blowing off water on the surface of the coated part; and (2) air sweeping: blowing the water on the surface of the coated part completely until the coated part is dry.

A developing device includes a developing roller, a magnetic roller, a capacitor, a transformer, a switching section, a control section, a temperature detecting section, and a storage section. When changing the duty ratio of a control signal in multiple sequential steps, the control section determines the resonance period based on the temperature and temperature characteristic data and changes the duty ratio of the control signal to the next step during a changing time slot which is one of the first and second halves of a period of voltage fluctuation of the capacitor based on the determined resonance period, the one half in which the current flowing through the switching section is smaller than in the other half of the period.

The invention discloses a microfluidic sampling system, which includes a quantitative sampling module, an air pressure drive and control module, and a negative pressure generator; the quantitative sampling module includes a sample pool, an inlet working channel, a first one-way valve, a first hydrophobic Valve, quantitative sampling chamber, second steam trap, third steam trap, second one-way valve, inlet working channel; the first one-way valve is set on the inlet working channel; the second one-way valve is set on the outlet working channel The inlet and outlet ports of the quantitative sampling chamber are respectively the first steam trap and the second steam trap; a third steam trap is arranged between the second steam trap and the second one-way valve; the pneumatic drive and control module includes a micro air pump, The miniature solenoid valve and the controller, the air pump is the air source to provide the driving pressure, the solenoid valve and the controller form the control unit to control the on-off of the driving pressure. The system can improve the precision of quantitative sample injection, and can control the flow rate and flow rate of the sample according to the principle of pulse modulation during sample injection, and can save the cost of sample injection.

The invention relates to the technical field of bright lighting, in particular to a solar spectrum simulation WLED manufacturing method based on a quantum dot, and the method comprises the following steps: (A) synthesizing CdSe / ZnS core-shell quantum dot solvents in various sizes; (B) synthesizing CdSe / CdS core-shell quantum dot solvents in various sizes; (C) mixing the various solvents obtained at the steps A and B, mixing the mixture solvents with epoxy resin, and performing uniform stirring; (D) dropwise adding the mixture obtained at the step C onto the surface of a GaN chip, and performing heating in a vacuum oven to obtain a WLED. The invention further discloses a smart lamp bulb made of the WLED. Due to the quantum confinement effect of the quantum dots, the CdSe core-shell quantumdots have many advantages compared with traditional fluorescent materials, such as symmetrical emission spectrum, strong fluorescence stability, narrow full width at half maximum and high fluorescencequantum yield; by changing the size and chemical composition of the semiconductor quantum dots, the fluorescence emission wavelength can cover the whole visible region, and the method is very practical.