73results about How to "Eliminate overshoot" patented technology

One method of obtaining an initial adjusted mass flow controller valve start position comprises obtaining a mass flow controller delay period and setting a mass flow controller valve to an initial valve opening position that is less than an expected optimal valve opening position. An initial desired flow rate and initial operating conditions are input into a control system that is in communication with the valve, and the control system is initiated. The control system is adapted to adjust the valve opening position to achieve the initial desired flow rate, while taking into account flow rate and valve position feedback to the control system. During operation of the MFC and control system, the valve position and the flow rate are recorded in one embodiment and a flow rate that one of meets and exceeds a threshold is detected. An initial-flow time-period extending from the time of control system initiation to detection of the threshold being one of met and exceeded is determined and the mass flow controller delay period from the initial flow time period is subtracted from the initial-flow time-period to obtain an adjusted start time. The valve opening position at the adjusted start time is set as the initial adjusted mass flow controller valve start position.

An image forming apparatus has a fixing unit that applies heat energy to non-fused developer on a medium. The medium is advanced in a transport path and a heater supplies heat energy to the fixing unit when the medium passes the fixing unit. When a trailing end of the medium is a predetermined distance upstream of the fixing unit, a controller operates in a first mode in which the controller causes the heater to supply a first amount of heat energy to the fixing unit. When the trailing end of the medium is within a predetermined distance upstream of the fixing unit, the controller operates in a second mode in which the controller causes the heater to supply a second amount of heat energy to the fixing unit. The second amount of heat energy is smaller than the first amount of heat energy.

Packet flow rate control techniques are enhanced by the interactive and early invocation of packet queuing to control short flows of packets and to eliminate undershoot and overshoot of a targeted flow rate. Packet queuing involves the scheduled release of packets in accordance with flow policies (priorities) to achieve a pre-selected outgoing target flow rate. The combination of controlled packet queuing and packet flow rate control with appropriate mechanisms for favoring one over the other improves the efficiency of data transmission.

The invention discloses an overcurrent control circuit, an overcurrent control method and a power supply system using the same. When the system normally operates, a fixed reference voltage is used; when output short circuit or overcurrent occurs, the reference voltage is pulled down; at the moment of output short circuit recovery or overcurrent recovery, the reference voltage rises slowly to a steady-state value; and an output voltage feedback signal rises slowly with the reference voltage. Output voltage overshoot can be effectively eliminated to protect the system from damage.

The present invention relates to a fast starting circuit of a bandgap reference voltage source, wherein the bandgap reference starting circuit comprises: PMOS transistors PM1 and PM2, NMOS transistor NM1, depletion NMOS transistor NM2, a current source; the transistor NM1 and the transistor NM2 The gate is connected to the Ponrst signal; when the Ponrst signal is at a high level, the tube NM1 and the tube NM2 are turned on, and the current source current I bias The bias voltage Pbias_setup is generated by the transistor PM1 at the node corresponding to the drain of the transistor NM1 , so that the voltage of the Pbias signal corresponding to the output terminal of the operational amplifier is equal to the bias voltage Pbias_setup. The invention uses the bias current source to start the voltage reference source, which can eliminate the voltage overshoot phenomenon and improve the stability of the circuit.

The invention provides an automotive electronic throttle valve control method and device. The device comprises a curve set module, an opening detection module, a starting point value selection module and an increment adjustment module, wherein the curve set module is used for setting a electronic throttle valve balance resistance curve; the opening detection module is used for detecting the current opening of an electronic throttle valve; the starting point value selection module is used for selecting the PWM starting point value for conducting PID increment adjustment on the electronic throttle valve balance resistance curve set by the curve set module according to the difference value between the current opening of the electronic throttle valve detected by the opening detection module and the target opening; the increment adjustment module is used for selecting the corresponding increment PID adjustment mode according to the absolute value of the difference value between the current opening and the target opening of the electronic throttle valve, conducting PID increment adjustment on the current opening of the electronic throttle valve according to the PWM starting point value selected by the starting point value selection module so that the current opening of the electronic throttle valve approaches the target opening. By means of the automotive electronic throttle valve control method and device, problems of action lag and overshooting of the electronic throttle valve can be solved.