摘要:
A device for actuating a butterfly throttle valve of an internal combustion engine includes a hydraulic setting member for rotating a shaft of the throttle valve. The hydraulic setting member is driven by a branch flow of fuel delivered by a fuel pump and acting as pressure medium. The branch flow passes through a series of connection of adjustable throttles connected in a hydraulic bridge circuit. The throttles are adjusted by a regulating signal corresponding to the difference between an actual position signal delivered by a position sensor coupled to the throttle valve, and a desired position sensor coupled for example to a gas pedal of the motor vehicle.
摘要:
The invention relates to an electric control arrangement for generating analog manipulated variables, having at least one basic controller circuit having a particular controller structure. The transfer function of the basic controller circuit, which is determined by the controller structure, is established with respect to magnitude by means of controller parameters and is supplied with an analog control-difference signal formed from desired value and actual value. A digital adjusting arrangement is provided for simple adaptation to the particular controlling task with the least possible complexity as to computation. The digital adjusting arrangement 34, on the basis of digital input quantities, selects at least one basic controller circuit 12 having a particular controller structure from several basic controller circuits 12 and switches this basic controller circuit 12 into the analog control loop and/or allows a variation of the controller parameters. Moreover, a corresponding method for controlling analog quantities is specified.
摘要:
An electric control motor is proposed, which serves to adjust final control elements in closed- or open-loop control systems, in particular for varying the position of throttle devices provided for metering fuels in internal combustion engines. The control motor includes a housing, in which an electromagnetic coil and an armature are disposed, the armature being rotatably supported upon a shaft providing spaced air gaps therewith and with magnetic poles. The magnetic poles are disposed on arcuate conducting bodies, which are disposed in spaced relation on a nonmagnetic carrier body. At ends remote from the magnetic poles, the conducting bodies communicate with one another via a magnetically conductive plate.
摘要:
An adjusting device for precise rotary angle adjustment of final control elements in closed- or open-loop control devices. The adjusting device comprises a rotary magnet apparatus in which parallel air gaps are formed between the poles of the armature and the magnet poles of the armature counterpart. In order to attain constant torques over the angle of rotation of the armature, when the electric current applied to the coil is constant, the end faces of the armature poles are embodied as wedge-shaped.
摘要:
A device for controlling at least one electromagnetic load, which includes a first switching device arranged between a first terminal of a supply voltage and a first terminal of at least one load, and a second switching device arranged between a first terminal of an assigned load and the second terminal of the supply voltage. The energy released during the transition from a first higher current (IH) to a second lower current (IH) is stored in a storage device.
摘要:
An etched metal membrane has its rim laser-welded or electron-beam-welded to a ring made of the same kind of metal within which a central electrode is held by a metal-to-glass seal. The welding is done in vacuum to avoid the necessity of later evacuation. The pressure sensor capacitance thus formed is connected through an impedance converter to an oscillator circuit which provides an output frequency that varies with the sensed pressure. The inner surface of the central electrode is flush with the surface of the rim to which the membrane is welded to reduce variations in capacitance of the sensor, and any residual variations are compensated by a resistance balance in the evaluation circuit. The insensitivity of the system to temperature and its service life make it suitable for sensing the intake air pressure of an internal combustion engine.
摘要:
The wheels at opposite ends of an axle - and which may be twin or tandem wheels -- each have a pressure switch and a tank circuit associated therewith, rotating with the wheel. The tank circuits includes a normally closed pressure-sensitive switch which, when the pressure in the respective tire drops below a certain value, opens the tank circuit. The coil of the tank circuit is coupled with a transducer coil connected to a blocking oscillator which, upon passage of the tank circuit, provides an output pulse. The frequency or recurrence rate of the output pulses from opposite ends of the wheels at an axle are compared in an integrating comparator and, if the frequencies differ after a predetermined integration time, provide an alarm signal. The integrator or a digital counter which should have a number of count stages, only the last one providing an alarm signal to allow for variation in frequency with normal tire pressure when the vehicle rounds a curve. Tandem or multiple wheels at one end of the axle each can be provided with a tank circuit, offset 90.degree. with respect to each other, however. Use of tandem wheels increases the absolute frequency and does not change the comparison system.
摘要:
A method and a device for monitoring a fuel-metering system, in particular a common-rail system for a diesel fuel engine. A defect is recognized on the basis of an output signal from a structure-borne noise sensor.
摘要:
In a pressure transducer (11), the diaphragm (14) is fastened at the front side of the housing (10) facing the combustion chamber of an internal combustion engine by weld connections. The pressure acting on the diaphragm (14) is transmitted via the plunger (16) to a sensor block (18) including a plurality of piezoelectrically acting crystals (19, 20). The quartz disks (19, 20) are glued together with one another and with an intermediate electrode (21) as well as with the housing (10) of the pressure transducer (11) by a conducting glue. The plunger (14), the abutment (23) and the piezoelectrically acting crystals (19, 20) are connected in the housing (10) so that force transmission to the crystals (19, 20) occurs without mechanical pretensioning. The pressure transducer (11) is virtually free of dynamic temperature errors and enables a relatively exact determination of the pressure curve with respect to time in the combustion chamber of an internal combustion engine in long-term operation.
摘要:
A valve assembly for controlling fluid flow between a fluid source and a load has an intake valve having a valve body displaceable between a closed position preventing flow through the intake valve and an open position permitting such flow and an output valve having a valve body displaceable between a closed position preventing flow through the output valve and an open position permitting such flow. Conduits or passages connect the valves in series between the load and the source so that fluid can only flow between the load and source when both of the valves are in their open positions. Respective biasing units urge each of the valves into one of its positions and respective electromagnet-type actuators are electrically energizable to move each valve into the other of its positions. The one position of one of the valves is the closed position and the one position of the other valve is the open position. In addition the two valves are substantially identical. As a result the response times of these two valves will be identical also and will change identically with time or temperature, since substantially the same flow is traversing both valves.