摘要:
In an apparatus for evaluating and controlling the driving state of a traveling wave motor composed of a stator equipped with an elastic vibrating body and an excitation system composed of a plurality of segments and generating ultrasound vibrations as well as a rotor that is in contact under pressure with the stator in a surface region and is equipped with a sensor device that is disposed at the vibrating body or at the excitation system, the signals of the sensor device are fed to the regulating circuit of an evaluation and control unit for controlling the excitation system. The sensor device includes at least two sensor surfaces which are attached to the vibrating body or to the excitation system and the signals corresponding to the sensor surfaces are fed separately to the evaluation and control unit.
摘要:
An electrohydraulic pressure supply unit involving the joint operation of two energy converters, which can be adjusted independent of each other, including an electric motor with speed control that drives a variable displacement pump with a variable displacement volume. The electric motor converts electrical output (loss-encumbered), into mechanical output, meaning into speed n and torque T. The pump then converts this mechanical output (also loss-encumbered) into hydraulic output. The hydraulic output is determined by the pressure difference &Dgr;p across the pump and the volume flow Q. The pressure difference &Dgr;p generally is impressed by the consumer or load on the system. The volume flow Q is the result of the displacement volume V and the motor speed n. The torque T, which must be generated by the motor, is derived from the displacement volume V and the pressure differential &Dgr;p. During the conversion from hydraulic output to mechanical output, the displacement volume V determines the distribution of the output to the speed n of the motor and the torque T. The current I flowing through the electric motor is primarily determined by the torque T while the voltage U is primarily influenced by the motor speed n. The volume flow supplied by the electrohydraulic pressure supply unit is essentially adjusted by controlling the speed adjustment of the electric motor. The speed of the electric drive motor in this case can essentially be adjusted independent of the displacement volume of the variable displacement pump.
摘要:
In an internal combustion engine including a housing with cylinders arranged in the housing, a crankshaft, and pistons moveably disposed in the cylinders and operatively connected to the crankshaft, and a device for changing the compression ratio of the cylinders of the internal combustion engine, the device comprises an adjusting arrangement with an eccentric which is mounted in the housing and, by means of rotation, controls the position and the direction of movement of the adjusting arrangement, and a drive for operating the adjusting arrangement including the eccentric.
摘要:
The invention relates to an electric drive unit comprising an electronic control module and an electric motor. The cooling of the components of the electric drive unit should be effected in a simple manner. To this end, the hub of the impeller wheel, which is situated on the rotation axis of the electric motor and provided for producing a working air flow, has a two-walled design, whereby a hub inner space is formed between the outer wall and the inner wall of the hub of the impeller wheel. At least one cooling surface of the cooling body, said surface being in contact with components of the electronic control module, projects into the hub inner space. A gap communicating with the hub inner space, is formed between the hub of the impeller wheel and a carrier section which supports the electronic control module and the electric motor. In addition, through-holes communicating with the hub inner space are provided in at least one component of the electric drive unit. When the electric drive unit operates and the impeller wheel is in motion an air flow between the gap and the through-holes is established. The invention also relates to an electric drive unit with a fan motor.
摘要:
A method of operating an actuator for electromagnetically controlling a valve in an internal combustion engine involves supplying a heating current to the operating coils of the actuator before starting the internal combustion engine from a cold start condition. Thereby, the operating coils, the components surrounding them, and the lubricant are heated to ensure proper viscosity of the lubricant and thus proper operation of the actuator.
摘要:
An electric drive unit includes an electric motor for driving a fan. The motor has an electronic control module. An impeller wheel for producing a working air flow is mounted by bearings on an axle of the electric motor. The hub of the impeller wheel has at least one preferably two walls enclosing a cooling space or cooling space portions. At least one cooling surface of a cooling body is in contact with components of the electronic control module and projects into the cooling space. A gap formed between the hub of the impeller wheel and a carrier section communicates with an inner hub space. Holes (43, 322) communicating with the hub inner space are provided in at least one component of the electric drive unit. When the impeller wheel rotes a convection cooling air flow is established between the gap and the holes.
摘要:
A steering system for a motor vehicle, which allows steer-by-wire operation, a hand-torque actuator being connected in the steer-by-wire mode to a steering handle, e.g. a steering wheel, to simulate a steering resistance or a restoring torque. In order to be able to ensure adequate operating safety for the vehicle if the hand-torque actuator fails, even if the steering system is operated on a steer-by-wire basis, damping means are provided, which damp adjusting movements of the steering handle by the driver in the steer-by-wire mode if the hand-torque actuator fails.
摘要:
In an internal combustion engine including a housing with cylinders arranged in the housing, a crankshaft, and pistons moveably disposed in the cylinders and operatively connected to the crankshaft, and a device for changing the compression ratio of the cylinders of the internal combustion engine, the device comprises an adjusting arrangement with an eccentric which is mounted in the housing and, by means of rotation, controls the position and the direction of movement of the adjusting arrangement, and a drive for operating the adjusting arrangement including the eccentric.
摘要:
In a method and device for adjusting an electro-dynamic brake of an electric camshaft adjuster for a phase angle adjustment of a camshaft of an internal combustion engine with respect to the crankshaft thereof, the phase angle is controlled by means of a position controller and the adjustment speed of the phase angle of the camshaft with respect to the crankshaft is controlled by means of an adjustment speed controller by controlling the current through the electro-dynamic brake by means of a further adjustment device and the use of Pilot controls to improve the control behavior of the cascade controller.
摘要:
In a method and device for adjusting an electro-dynamic brake of an electric camshaft adjuster for a phase angle adjustment of a camshaft of an internal combustion engine with respect to the crankshaft thereof, the phase angle is controlled by means of a position controller and the adjustment speed of the phase angle of the camshaft with respect to the crankshaft is controlled by means of an adjustment speed controller by controlling the current through the electro-dynamic brake by means of a further adjustment device and the use of Pilot controls to improve the control behavior of the cascade controller.