Abstract: An on-board power system for a vehicle includes a first on-board power system branch with a first operating voltage U1, a first energy accumulator, and a first electrical consumer; a second on-board power system branch with a second operating voltage U2 and a second energy accumulator; and a third on-board power system branch with a third operating voltage U3 and a third electrical consumer. The on-board power system also includes a DC/DC converter configured to transmit energy bidirectionally at least between the first on-board power system branch and the second on-board power system branch. The on-board power system also includes a switching device configured to selectively connect the first energy accumulator and the second energy accumulator to one another in series via in such a way that the third operating voltage U3 can be made available by the first operating voltage U1 and the second operating voltage U2 together.

Abstract: An on-board power system for a vehicle includes a first on-board power system branch with a first operating voltage U1, a first energy accumulator, and a first electrical consumer; a second on-board power system branch with a second operating voltage U2 and a second energy accumulator; and a third on-board power system branch with a third operating voltage U3 and a third electrical consumer. The on-board power system also includes a DC/DC converter configured to transmit energy bidirectionally at least between the first on-board power system branch and the second on-board power system branch. The on-board power system also includes a switching device configured to selectively connect the first energy accumulator and the second energy accumulator to one another in series via in such a way that the third operating voltage U3 can be made available by the first operating voltage U1 and the second operating voltage U2 together.

Abstract: A monitoring circuit is provided for an energy storage device. The energy storage device has a plurality of cells which each provide a voltage between their first and second connections and are switched in series. At least two voltage measuring circuits are provided, wherein the voltage measuring circuits each measure the voltage between a first measurement input and a second measurement input. A first connection conductor connects the first terminal of the first cell to the first measurement input of a first voltage measurement circuit. A second connection conductor connects the second terminal of the first cell to the second measurement input of a first voltage measurement circuit. A first load resistor can be switched between the first measurement input of the second voltage measurement circuit and a first fixed potential.

Abstract: A waste gate actuator for an exhaust gas turbocharger, including an actuator housing and an actuator cover, an element for actuating the waste gate valve and electronic components for controlling the element to actuate the waste gate valve being arranged in the waste gate actuator. Provided is a simple and inexpensive revolution counting system on the turbocharger which allows the number of revolutions of the rotating parts (turbine wheel, compressor wheel, turboshaft) to be detected without substantial constructional alterations to the design of existing turbochargers. A sensor for detecting the variations in a magnetic field that are produced by the rotation of the rotating parts is arranged in or on the actuator housing or in or on the actuator cover.

Abstract: A compressor casing for an exhaust gas turbocharger is disclosed. The exhaust gas turbocharger has a rotatable turboshaft, a compressor wheel mounted on the turboshaft, and a turbine wheel mounted on the turboshaft. The compressor casing includes a sensor for measuring a rotational speed of the turboshaft. The sensor is embedded in the compressor casing and forms an integral component of the compressor casing.

Abstract: The invention relates to an active sensor element for recording the speed of an exhaust gas turbocharger, comprising a suppressor circuit which has at least one diode. In order to specify a device for temperature measurement at the turbocharger and in particular at the turbocharger in the region of the active sensor, the current-voltage characteristics of the diode are evaluated for determining the temperature in the sensor element.

Abstract: A method for monitoring the state or an engine oil in an internal combustion engine, in which first the viscosity of the engine oil is determined at different temperatures of the engine oil, after which a viscosity index is ascertained from the viscosity and the temperature of the engine oil, which method permits a reliable statement about the state of the engine oil during its issue in the internal combustion engine to be made, the viscosity index of the engine oil is determined at different successive times and the change of the viscosity index over time is used as a measure for assessing the oil state.

Abstract: A monitoring circuit is provided for an energy storage device. The energy storage device has a plurality of cells which each provide a voltage between their first and second connections and are switched in series. At least two voltage measuring circuits are provided, wherein the voltage measuring circuits each measure the voltage between a first measurement input and a second measurement input. A first connection conductor connects the first terminal of the first cell to the first measurement input of a first voltage measurement circuit. A second connection conductor connects the second terminal of the first cell to the second measurement input of a first voltage measurement circuit. A first load resistor can be switched between the first measurement input of the second voltage measurement circuit and a first fixed potential.

Abstract: A waste gate actuator for an exhaust gas turbocharger, including an actuator housing and an actuator cover, an element for actuating the waste gate valve and electronic components for controlling the element to actuate the waste gate valve being arranged in the waste gate actuator. Provided is a simple and inexpensive revolution counting system on the turbocharger which allows the number of revolutions of the rotating parts (turbine wheel, compressor wheel, turboshaft to be detected without substantial constructional alterations to the design of existing turbochargers. A sensor for detecting the variations in a magnetic field that are produced by the rotation of the rotating parts is arranged in or on the actuator housing or in or on the actuator cover.

Abstract: An element for generating a magnetic field, having an annular frame for receiving an annular magnet which rotates with a turboshaft. The magnet is mounted in the frame such that the frame stabilizes and guides the magnet mechanically. In order to specify an element for generating a magnetic field which reliably fixes and guides the magnet, the magnet is connected to the frame by at least one spot weld.

Abstract: The invention relates to a pressure sensor device comprising a membrane body in the form of a membrane whose first side is exposed to a working medium whereas the second side thereof is arranged oppositely to the first side. The inventive device also comprises at least one pressure sensor element (16, 18) for detecting the extension or compressive strain of the membrane body produced by the working medium pressure. A temperature sensor element (22) for detecting the membrane body temperature is mounted thereon.

Abstract: The invention relates to an active sensor element for recording the speed of an exhaust gas turbocharger, comprising a suppressor circuit which has at least one diode. In order to specify a device for temperature measurement at the turbocharger and in particular at the turbocharger in the region of the active sensor, the current-voltage characteristics of the diode are evaluated for determining the temperature in the sensor element.

Abstract: A compressor casing for an exhaust gas turbocharger is disclosed. The exhaust gas turbocharger has a rotatable turboshaft, a compressor wheel mounted on the turboshaft, and a turbine wheel mounted on the turboshaft. The compressor casing includes a sensor for measuring a rotational speed of the turboshaft. The sensor is embedded in the compressor casing and forms an integral component of the compressor casing.

Abstract: An exhaust fume turbocharger for an internal combustion engine comprises a compressor and a turbine. A compressor wheel is rotatably mounted in the compressor and a turbine wheel is rotatably mounted in the turbine. The compressor wheel is mechanically connected to the turbine wheel by a rotatably mounted turboshaft. The compressor wheel is connected to the turboshaft by a fastening element and the exhaust fume turbocharger comprises a system for sensing the rotational speed of the turboshaft. The arrangement for sensing the rotational speed is arranged at the end of the turboshaft on the side of the compressor with an element for varying a magnetic field between the compressor wheel and the fastening element. The magnetic field is varied depending on the rotation of the turboshaft and a sensor element is arranged in the proximity of the element for varying the magnetic field for sensing the variation in the magnetic field and converting it into electrical signals.

Abstract: Presented is an exhaust gas turbocharger. The turbocharger includes a compressor, a turbine, a compressor wheel mounted rotatably in the compressor, a rotatably mounted turboshaft, a device for detecting the rotational speed of the turboshaft, an element for varying a magnetic field, and a turbine wheel mounted rotatably in the turbine. The compressor wheel is mechanically connected to the turbine wheel via the turboshaft. The device for detecting the rotational speed includes the element for varying the magnetic field which is disposed on or in the turboshaft in the region between the compressor wheel and the turbine wheel. The variation of the magnetic field occurring as a function of the rotation of the turboshaft. The turbocharger further includes a sensor element, which detects the variation of the magnetic field and converts it into signals which can be evaluated electrically, arranged in proximity to the element for varying the magnetic field.

Abstract: A sensor for measuring the rotational speed of a turboshaft of a turbocharger includes a sensor housing and a sensor element which is positioned in the sensor housing and which senses a variation of a magnetic field caused by the rotation of the turboshaft. In order to provide a sensor for measuring the rotational speed of a turboshaft which can be produced simply and at low cost and also can be integrated in a turbocharger without major structural modifications, the sensor element can be positioned outside the turbocharger, on or in a compressor housing, and a pole piece is arranged on the sensor element in such a way that it concentrates the magnetic field in the sensor element.

Abstract: The invention relates to an exhaust-gas turbocharger (1) for an internal combustion engine, said turbocharger comprising a device (26) for detecting the speed of the turbocharger shaft (5). The device (26) for detecting the speed comprises an element (21) for varying a magnetic field, which is located on and/or in the end (10) of the turbocharger shaft (5) that is on the compressor side, said variation of the magnetic field (25) taking place in accordance with the rotation of the turbocharger shaft (5). A sensor element (19) is provided in the vicinity of the element (21) for varying the magnetic field (25), said sensor element detecting the variation in the magnetic field and converting it into electric signals that can be evaluated.

Abstract: A sensor for measuring the rotational speed of a turboshaft of a turbocharger includes a sensor housing and a sensor element which is positioned in the sensor housing and which senses a variation of a magnetic field caused by the rotation of the turboshaft. In order to provide a sensor for measuring the rotational speed of a turboshaft which can be produced simply and at low cost and also can be integrated in a turbocharger without major structural modifications, the sensor element can be positioned outside the turbocharger, on or in a compressor housing, and a pole piece is arranged on the sensor element in such a way that it concentrates the magnetic field in the sensor element.

Abstract: Sensor for determining measured variables which are suitable for controlling an air-conditioning system and other apparatuses which influence the climate of an area, including a motor vehicle, has a single sensor housing and a printed circuit board which is equipped with sensor elements for determining the measured variables and with electronic components for processing electrical signals produced by the sensor elements, as a function of the measured variables. In the sensor, at least one light-sensitive sensor element and one gas-sensitive sensor element are arranged in the single sensor housing.

Abstract: A pressure measurement unit in a pressure measurement system has a housing section (8) which has an internal space (9) with internal surfaces, and a ceramic unit (1) which has a pressure diaphragm (2) and at least one external surface, with the ceramic unit (1) held in the press fit in the housing section (8) and with radial holding stresses operating between the external surface of the ceramic unit (1) and the internal surfaces of the housing section (8). A method for manufacturing a corresponding pressure measurement unit with a housing section (8) and with a ceramic unit (1) which has a pressure diaphragm (2) and at least one external surface, with holding stresses built up between the housing section (8) and the ceramic unit (1), which hold the ceramic unit (1) in the internal space of the housing section (8).