摘要:
Electronic control circuitry is provided for controlling the actuating current of electromagnetic devices and in particular of the electromagnetic fuel injection valves of an internal combustion engine. In order to program the magnitude of the actuating current from an initial high level to a lower maintenance level, there is provided a driver circuit which receives fuel injection control pulses from a fuel injection system, not itself part of the invention, and processes these control pulses into valve-actuating current pulses. The valve current is sensed by suitable transducer, for example a resistor, and the resulting signal is fed to a two-point controller which suitably alters the input to the driver circuit to thereby change the valve actuating current. The set-point value on which the two-point controller operates is itself subject to change by means of a suitable circuit. There is further provided a free-running circuit and a quenching circuit for reducing the voltage peaks resulting from the collapse of the magnetic fields stored in the valve actuating coils. Two embodiments are presented.
摘要:
A protective arrangement for an electromagnetic load is disclosed. In this protective arrangement, the load and a control transistor form a series circuit from the battery voltage to ground and a series circuit of a free-wheeling transistor and a free-wheeling diode is connected in parallel with the load. By coupling the base of the free-wheeling transistor to ground, this transistor is made continuously conductive provided that the polarity of the supply voltage is correct, whereas, this free-wheeling transistor blocks if the supply voltage polarity is incorrect. This assures that none of the components is in danger of being destroyed in the event that the polarity of the supply voltage is incorrect.
摘要:
The motor is serially connected with a diode and a sensing resistor so that half waves of one polarity, for example negative, can flow through the motor and provide, across the resistor, a voltage drop corresponding to loading placed on the motor. A thyristor is connected in parallel to the diode and reversely poled to conduct the other half wave, then the positive, if triggered. Triggering of the thyristor is controlled by the voltage drop across the sensing resistor so that, under no-load conditions, only the negative half waves will be applied to the motor, thus limiting its no-load speed but, as loading is placed thereon, increasing portions of the positive half waves are likewise passed through the motor. The diode may, itself, be a controlled diode such as a thyristor which is rendered conductive by a phase control network, thus providing speed control for the motor, controlling actually only the negative half wave but, due to sensing resistor, effectively, regulating the motor current during both half waves. The circuit uses a capacitor which is charged to the voltage forming the control voltage on the thyristor conducting the positive half wave.
摘要:
It is presented a method for adjusting handover parameters of a processed base station in relation to neighbouring base stations, neighbouring the processed base station. The method being executed in a handover parameter determiner and comprises: obtaining (20) a list of neighbouring base stations of the mobile communication network; determining (22), for each of the neighbouring base stations in the list, a capability to send handover issue report messages; and adjusting (24) the handover parameters based on the determined capabilities for each of the neighbouring base stations in the list.
摘要:
The invention relates to a method for producing sandwich construction elements for substantially load-bearing and self-supporting building parts. In order to produce a sandwich element which is suitable for self-supporting and substantially load-bearing building parts, since it ensures the necessary transmission of the compressive, tensile and shear forces between the cover layer and core layer and meets the increased fire-protection requirements, the production method proposed contains the following steps: a) producing at least one layer of a mechanically bonded fiber nonwoven which is impregnated with a binder based on at least one heat-curable resin system, and is itself based on naturally occurring raw materials, in particular hemp, flax, jute, sisal, kenaf, cotton and wool and/or mixtures thereof, b) curing the heat-curable resin system in order to produce at least one hardened layer of the fiber nonwoven, wherein, before and/or during the curing operation, a surface structure is applied to at least part of the layer of the fiber nonwoven and/or at least one further binder based on at least one heat-curable resin system is applied to at least part of the surface of the hardened layer of the fiber nonwoven, and fixed thermally, c) bringing a heat-foamable or heat-foamed phenol resin into contact with that surface of at least one hardened layer of the fiber nonwoven which has been modified according to step b), d) possibly annealing, at temperatures ranging from 40 to 80° C., the composite produced in a) to c), and e) curing the further binder based on at least one heat-curable resin system, and possibly applied in b), at a temperature ranging from 150 to 200° C., possibly under elevated pressure.
摘要:
The invention relates to a method in a Mobility Management Entity (10,11) for handling a setup of an S1 Application Protocol signalling connection between a first radio base station and the Mobility Management Entity (10,11) in a Long Term Evolution radio communications network. The Mobility Management Entity (10,11) receives an S1 Setup Request message from the first radio base station (12). Furthermore, the Mobility Management Entity (10,11) sends an S1 Setup Response message to the first radio base station (12) enabling the first radio base station to handle the setup of the S1 Application Protocol signalling connection. The S1 Setup Response message comprises an indication of at least one supported tracking area code of a tracking area, which tracking area is served by the Mobility Management Entity (10,11).
摘要:
An ultrasonic dental handpiece and insert assembly is provided. Scaler inserts that can be used to clean and polish tooth surfaces are particularly preferred. A sleeve is removably mounted on the handpiece. The handpiece contains a primary coil and the sleeve encloses a secondary coil, which are inductively coupled together so that electromagnetic energy can be transferred between them. A flexible light guide member having a light source such as a light-emitting diode extends from the sleeve. The light guide can bend and flex in any direction allowing the light source to emit light in any direction.
摘要:
A system and method of scheduling radio resources for a plurality of users in a packet-switched radio communication network. A scheduling number (Si) is calculated for each user before each scheduling event. A weight (Wi) is assigned to each user based on an associated Quality of Service. The Si varies depending on the assigned Wi and when the user entered the scheduling session. Radio resources are assigned to the user having the largest ratio Wi/Si between the weight and the scheduling number.
摘要:
A motor control centre is provided having an analyst system which is capable of recording data from the monitoring equipment provided therein, and providing a predictive analysis of the data received. The predictive analysis allows the operator to have the ability to schedule routine maintenance to correct a predicted failure of a device to continue operation within a pre-determined set of parameters. Improved operation and maintenance of a controlled system is achieved.
摘要:
A system and method for splicing reeled media using operational feedback. According to certain embodiments, the method of operating a media production system involves sensing speed parameters of first and second reeled media, tracking an unwinding parameter of the first reeled media, and positionally tracking a leading end position of the second reeled media. The method also involves controlling splicing between the first and second reeled media based at least partially on the speed parameters, the unwinding parameter, and the leading end position.