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327 results about "Limit time" patented technology

Fault detecting and processing method and device for braking assisting system

The invention provides a fault detecting and processing method and device for a braking assisting system. The fault detecting and processing method for the braking assisting system includes the steps that the needed actual time for increasing a first value to a second value of the vacuum degree in a vacuum pump in the current environment is obtained; the needed normal upper limit time for increasing the first value to the second value of the vacuum degree in the vacuum pump in the non-fault state of the braking assisting system in the current environment is obtained, and the needed fault upper limit time for increasing the first value to the second value of the vacuum degree in the vacuum pump in the fault state of the braking assisting system in the current environment when the braking function can be finished is obtained as well; whether a fault exists in the braking assisting system of a vehicle or not is judged according to the actual time and the normal upper limit time; if the fault exists, the corresponding fault level is obtained according to the actual time, the normal upper limit time and the fault upper limit time; and corresponding processing operation is executed according to the fault level. By the adoption of the scheme, the fault of the braking assisting system of the vehicle can be diagnosed in time, and the personal safety of a driver and passengers can be guaranteed to the largest degree.
Owner:BEIJING ELECTRIC VEHICLE

Method for determining orbit transferring strategy of time-limited spacecraft coplanar rendezvous

The invention provides a method for determining an orbit transferring strategy of time-limited spacecraft coplanar rendezvous, and belongs to the field of the time-limited spacecraft coplanar rendezvous. The problem that the accuracy of the rendezvous algorithm calculation is affected caused by the poor observation effect at rendezvous time due to the fact that an existing spacecraft rendezvous technology has relatively low requirements on lighting conditions is solved. The method comprises the steps that the theoretical limiting time of the entire rendezvous process between a target spacecraft and a service spacecraft is calculated; then the two speed increments and the used time of orbit transferring in the service spacecraft orbit transferring process are calculated; initial values of the movement time of an initial orbit and initial values of the movement time of a target orbit for the optimized variable service spacecraft are calculated; integral is carried out on the rendezvous process to obtain position vectors of the service spacecraft and the target spacecraft at the rendezvous time and the angle of the position vectors; when the angle reaches 0 degree, at the moment, themovement time of the initial orbit and the movement time of the target orbit are used as the orbit transferring parameters and the orbit transferring strategy. According to the method, the calculationresults are accurate, and the iterative calculation process is simple.
Owner:HARBIN INST OF TECH

Quasi-resonant controlled switch voltage stabilizing circuit and method

The invention discloses a quasi-resonant controlled switch voltage stabilizing circuit and a method. By setting minimum limit time, a switching frequency is limited, and the minimum limit time is changed when the time of minimum voltage is close to the terminal time of the minimum limit time so that the purpose of preventing audio-frequency noise can be achieved. The circuit thereof comprises an energy storage element, a switch, a control circuit and a frequency limit circuit, wherein the energy storage element can store energy; the switch is electrically coupled with the energy storage element; when the switch is turned on, the energy storage element stores energy; when the switch is turned off, the energy stored in the energy storage element is transferred to the load; the control circuit is electrically coupled with the switch, controls the switch to be turned on or turned off, and turns on the switch when resonant voltage on both sides of the switch are lowered to minimum voltage;and the frequency limit circuit is electrically coupled with the control circuit, and limits the switching frequency of the switch by setting the minimum limit time, wherein when the time of the minimum voltage is close to the terminal time of the minimum limit time, the frequency limit circuit changes the minimum limit time.
Owner:CHENGDU MONOLITHIC POWER SYST

Two-dimensional free limit-time control system and two-dimensional free limit-time control method for seat resources of study rooms

The invention discloses a two-dimensional free limit-time control system for seat resources of study rooms. The two-dimensional free limit-time control system has the advantages that seat reservation platforms, campus cards and a swipe card reader terminal on each study seat are mainly combined with one another, and accordingly the utilization rate of the seat resources can be increased; mobile phones or computer terminals can access the seat reservation platforms, and seats can be reserved by the aid of unified authentication codes in the campus cards; the swipe card reader terminals on the seats in the study room are connected with the seat reservation platforms, identity information of students can be read, and the seat resources used by readers can be reckoned by time; the seat reservation platforms are combined with the campus cards, the swipe card reader terminals are combined with the campus cards, accordingly, seat occupying phenomena can be effectively reduced, the utilization rate of the seat resources of the study rooms can be increased, the self-management consciousness of the readers can be improved, and electronic and computer software technologies are fused in an innovative method.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
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