Abstract:
In a method for operating an internal combustion engine having at least one cylinder which includes a first exhaust valve and a second exhaust valve, the internal combustion engine is operated in a scavenging operating mode in that the closing times of the exhaust valves after an ejection stroke of a four-stroke operating cycle are situated after an opening time of an intake valve, and the second exhaust valve is opened with a time delay relative to the first exhaust valve in the scavenging operating mode.
Abstract:
Layered germanium polymers that are semiconductive and demonstrate a strong red or infrared luminescence are produced through the topochemical conversion of calcium digermanide. Furthermore, silicon/germanium layer polymers can also be produced in this manner. These layer polymers can be produced epitaxially on substrates comprising crystalline germanium, and can be used to construct light-emitting optoelectronic components such as light-emitting diodes or lasers.
Abstract:
A method for transferring a semiconductor body selected from the group consisting of a semiconductor layer, a semiconductor layer sequence or a semiconductor layer structure from a growth substrate to a support material. An interface between the growth substrate and the semiconductor body or a region in the vicinity of the interface is exposed to electromagnetic radiation through one of the semiconductor body and the growth substrate. A material at or in proximity to the interface is decomposed by absorption of the electromagnetic radiation in proximity to or at the interface so that the semiconductor body can be separated from the growth substrate. The semiconductor body is connected to the support material.
Abstract:
A shiftable gear transmission has a plurality of gear pairs with free gears that can be engaged to one of the shafts by means of shift clutches and fixed gears that are permanently locked to one of the shafts. A start-up clutch arranged at the input side of the transmission couples and uncouples the torque flow. At least one of the shift clutches is a power-shift clutch with the ability to transmit a greater amount of torque than the other shift clutches. The start-up clutch and the power-shift clutch are controlled by at least one actuator unit.
Abstract:
In a method for operating an injection valve having a longitudinal axis, an injection needle, a control valve and an actuator embodied as a solid body actuator, wherein the actuator acts on the control valve and the control valve acts on the injection nozzle, various pre-defined quantities of electrical energy are supplied to the actuator in a plurality of adaptation flows in order to modify an axial length of the actuator. This electrical energy is defined such that an axial position of the injection nozzle remains unchanged. In correlation with the respective adaptation flow, and following the energy supply associated with the respective adaptation flow, a first and second voltage value are detected and a voltage differential value is then determined which is compared with a pre-defined threshold value and, on the basis of the comparison, at least one control of the actuator is adapted to the injection of fluid.
Abstract:
A method for determining the opening point in time of a control valve having a coil drive of an indirectly driven fuel injector for an internal combustion engine of a motor vehicle may include: detecting the time curve of the current intensity of a current flowing through the coil drive, determining a current integral with respect to the detected current intensity as a function of the time and starting from a defined initial time, and determining a time at which the current integral reaches at least a predefined current integral reference value, wherein the determined time is the opening point in time of the control valve. A corresponding device and a computer program for determining the opening point in time of a control valve of an indirectly driven fuel injector are also disclosed.
Abstract:
An injection valve is hydraulically coupled to a high-pressure accumulator in order to supply a fluid. The injection valve has a longitudinal axis, an injection needle, and an actuator. The actuator is designed to act on the injection needle. A pre-defined amount of electrical energy is supplied to the actuator in order to modify an axial length of the actuator in such a way that the injection needle moves out of the closed position. Once the pre-defined amount of electrical energy has been supplied, a first voltage value and a second voltage value are detected and/or determined by the actuator at respectively different pre-defined moments. On the basis of the first and second voltage values, a differential voltage value is determined, on the basis of which a first pressure is determined, which represents a pressure in the high-pressure accumulator.
Abstract:
In a method for operating an injection valve having a longitudinal axis, an injection needle, a control valve and an actuator embodied as a solid body actuator, wherein the actuator acts on the control valve and the control valve acts on the injection nozzle, various pre-defined quantities of electrical energy are supplied to the actuator in a plurality of adaptation flows in order to modify an axial length of the actuator. This electrical energy is defined such that an axial position of the injection nozzle remains unchanged. In correlation with the respective adaptation flow, and following the energy supply associated with the respective adaptation flow, a first and second voltage value are detected and a voltage differential value is then determined which is compared with a pre-defined threshold value and, on the basis of the comparison, at least one control of the actuator is adapted to the injection of fluid.
Abstract:
A first exhaust gas sensor signal (vls_up) of a first exhaust gas sensor (AS1) is detected. In addition, a second exhaust gas sensor signal (vls_down) of a second exhaust gas sensor (AS2) is detected. A relevant first estimated value of an emission of at least one exhaust gas component is determined in relation to a position of the first exhaust gas sensor (AS1) in the exhaust gas tract as a function of the first exhaust gas sensor signal (vls_up) and a relevant second estimated value of an emission of the at least one exhaust gas component is determined in relation to a position of the second exhaust gas sensor (AS2) in the exhaust gas tract as a function of the second exhaust gas sensor signal (vls_down). A conversion rate (K) of the at least one exhaust gas component is estimated as a function of a ratio of the second estimated value and the first estimated value of the determined emission. The exhaust gas catalytic converter is diagnosed as a function of the determined conversion rate (K).
Abstract:
A blind spot sensor system detects and/or classifies objects in a defined monitoring region of a motor vehicle. The blind spot sensor system contains a first device for emitting a first radar beam, and a second device for emitting a second radar beam. The radial visual range of the first radar beam (beam I) inclines counter to a direction of travel of the motor vehicle and the radial visual range of the second radar beam (beam II) is oriented in an substantially vertical manner in relation to the direction of travel such that the visual range of the radar beams (I and II) at least partially overlap and cover, substantially, the monitoring region. At least the first radar beam (beam I) can be actuated in a CW modulation mode and in a FMCW modulation mode. The blind spot sensor is used in vehicles, for example for assisting in lane changing.