摘要:
An an ultrasonic drive element having a plurality of layers of piezoelectric material, arranged one on top of another to form a stack, between each of which is located a contacting layer for application of an operating voltage. Each of the contacting layers is subdivided into at least two electrically unconnected subregions, at least one of which has an electrode for making contact to the adjacent piezoelectric layers. By applying suitable alternating-current voltages to the electrode, the surface of the layer stack is excited into mechanical oscillations which contain a motion component parallel to the plane of said surface.
摘要:
The invention provides first signals (w.sub.z, a.sub.L, a.sub.Q, a.sub.V1, a.sub.V2, a.sub.V3) representing the vehicle movements relative to an inertial reference system (K.sub.I) for use in a chassis regulation and/or control system in a vehicle. Based on the first signals, correction values (beta.sub.S, beta.sub.S ', beta.sub.S ", alpha.sub.S, alpha.sub.S ", psi.sub.S ', psi.sub.S ") for correction of the first signals are determined in such a way that vehicle movements relative to a road surface-fixed reference system (K.sub.S) are inferred from corrected first signals (S.sub.cor i). The invention has the advantage that the inertial sensor signals disturbed by road surface inclinations are projected into the road surface plane, obtaining signals which represent the vehicle movement relative to the road surface.
摘要:
In a fuel supply system for an internal combustion engine, significant parameters such as fuel pressure and fuel flow rate are determined continuously from measured variables with the aid of an observer. These variables which have been determined are used to achieve fuel delivery performed with regard to a requirement, the control operations being carried out as a function of requirements of the internal combustion engine by the control unit itself.
摘要:
The invention relates to a method of inputting the actual transmission ratio of a continuously variable transmission (CVT=continuously variable transmission) of a vehicle, especially a passenger motor vehicle. For this method, operating points of a shift characteristic field can be assumed which lie on a characteristic line of optimized consumption of a motor characteristic field of a motor of a vehicle. In this method, also operating points of the shift characteristic field can be assumed which lie on a characteristic line of optimized power of the motor characteristic field. The trace of the characteristic line of the shift characteristic field results from the particular selected characteristic line of the motor characteristic field. It is provided that operating points of the shift characteristic field can be assumed which lie on a dynamic characteristic line (c"') of the motor characteristic field. The dynamic characteristic line (c"') lies between the characteristic line (c') of the optimized consumption and the characteristic line (c") of the optimized power. The position of the dynamic characteristic line (c"') is dependent upon the magnitude of the rate of change of the power demand.
摘要:
The stiffness of the suspension is very much a function of the load in hydro-pneumatic vehicle suspensions. With high loads the vehicle suspension is stiff and with a light load it is relatively soft. In addition, the vehicle suspension of the wheel on the outside of the turn is stiffer than that of the wheel at the inside of the turn. The changes in the stiffness of the vehicle suspension are very disagreeable and can result in dangerous driving conditions. Equalization of the stiffness of the vehicle suspension is provided with the aid of a supplemental force. The supplemental force acts in the same direction as the load force of the vehicle chassis. The vehicle suspension is preferably suited for motor vehicles.
摘要:
A plurality of valves are triggered so that a first valve is triggered by a first trigger signal and a second valve is triggered by a second trigger signal, the first trigger signal and the second trigger signal are each generated by generating a pulse width modulated frequency signal of the first frequency f1 and a dither signal of the second frequency f2, where f1>f2, the trigger signal is generated by modulating the clock pulse duty factor of the frequency signal with the dither signal, and the dither signals of the first trigger signal and of the second trigger signal are synchronized with one another at chronological intervals.
摘要:
A hydraulic control system for controlling preferably at least two consumers, has a pump with an adjustable delivery quantity supplying pressure fluid, an adjustable metering orifice with which the consumers are each associatable, a power beyond connection to which at least one power beyond consumer is connectable, an inlet pressure governor unit situated downstream of the pump and acted on in a closing direction by a load pressure of the consumers or of the at least one power beyond consumer, the inlet pressure governor unit being provided in a pressure fluid flow path between the pump and at least one of the two consumers, while the power beyond connection branching off from a pressure fluid flow path between the pump and the inlet pressure governor unit, a tank, the inlet pressure governor unit in a spring-prestressed position closing a connection to the at least one of the two consumers and the tank, and in another position a pressure fluid connection to the tank is opened, the inlet pressure governor unit being movable into an additional position in which a throttled connection to the tank is opened.
摘要:
The invention discloses a hydraulic control arrangement for controlling a number of consumers, particularly of a mobile working machine. In addition to the consumers of the control arrangement, an additional consumer should be able to be connected to a power beyond port. All consumers and power beyond consumers are supplied with hydraulic fluid by a pump. An input pressure scale is provided downstream of the pump, and the greater of the load pressures of the consumers or of the at least one power beyond consumer is applied to the control port of said input pressure scale.
摘要:
Disclosed is a lifting gear valve arrangement for controlling a double-action lifting gear or an add-on unit with a continuously adjustable directional control valve and with an individual pressure compensator via which a pressure medium volume flow to and from a lifting cylinder of the lifting gear can be controlled. A proportionally adjustable pressure limiting valve is provided in the pressure medium flow path between an outlet connection of the directional control valve and a working connection of the lifting gear valve arrangement, via which the pressure inside this area can be limited to a maximum value. The adjustment of the pressure limiting valve is preferably performed as a function of the operating states of the lifting gear or of the type of add-on unit.
摘要:
Disclosed is a lifting gear valve arrangement for controlling a double-action lifting gear or an add-on unit with a continuously adjustable directional control valve and with an individual pressure compensator via which a pressure medium volume flow to and from a lifting cylinder of the lifting gear can be controlled. A proportionally adjustable pressure limiting valve is provided in the pressure medium flow path between an outlet connection of the directional control valve and a working connection of the lifting gear valve arrangement, via which the pressure inside this area can be limited to a maximum value. The adjustment of the pressure limiting valve is preferably performed as a function of the operating states of the lifting gear or of the type of add-on unit.