Abstract: Injection element of coaxial design for rocket combustion chambers with a combustion chamber pressure of 3 to 30 bar and for operation with two hypergolically reacting propellants, with a central body for the oxidant, whose flow channel has a twisting insert, a cross section contraction and a sharp opening edge, and with a sleeve concentrically surrounding the central body to limit an annular flow channel for the propellant, wherein the flow channel has a circular cylindrical outlet with a sharp opening edge. The flow channel of the central body has a circular cylindrical outlet. The opening edges of the central body and of the sleeve are located approximately in the plane of the front surface of the combustion chamber. A flow divider, which divides the propellant flow into five to twenty equal individual flows is arranged in the flow channel for the propellant. The velocities of flow of the oxidant and of the propellant are between 5 m/sec and 20 m/sec at the point of entry into the combustion chamber.
Abstract: In an exhaust gas system for an internal combustion engine for a vehicle which includes an exhaust gas conduit with an exhaust gas cleaner and a silencer, the structure-borne noise emission is reduced by coating surface areas of the exhaust system with a silencing layer consisting of metal powder which is applied by plasma spraying or sintering.
Abstract: System for packaging integrated circuits, especially sensors, in a housing, which also comprises multicontact bondings, especially hybrid ICs for three-dimensional arrangement of modules, wherein sensors (4, 5) are arranged at an angle in relation to one another on the base plate or the substrate (1). The sensors are contained in the single housing together with contact pins (pins) (2), and are connected in one plane by automatic bonding.
Type:
Grant
Filed:
August 4, 1993
Date of Patent:
September 26, 1995
Assignee:
Daimler-Benz Aerospace AG
Inventors:
Dieter Nagele, Manfred Weinacht, Klaus Farber
Abstract: The present invention pertains to a radar device with synthetic aperture based on rotating antennae (ROSAR principle), preferably for helicopters, which operates in the millimeter-wave range and is used mainly as an obstacle radar, wherein the full synthetic aperture length can be reached already within very short distances due to the arrangement of the antennae on a turnstile. Exemplary embodiments, calculations and representations are shown and explained.
Abstract: A multi-channel transmission system operates by transmitting digitally-coded signals modulated in sequential symbol blocks at a plurality of carrier frequencies, and receiving and demodulating the digitally-coded signals, wherein, in the transmitting, a test signal is generated in at least one symbol block, the test signal containing at least one periodically continued, differentially coded, self-orthogonal sequence of a constant amplitude modulated to a part of the plurality of carrier frequencies within a symbol block in differential coding.
Abstract: Device for prolonging the effective usage time (service life), arrangement and process for minimizing temperature effects in any ion-selective polymer membrane electrode measuring chain (ISPE measuring chain), wherein one solution or both solutions directly adjoining the polymer membrane (outer measuring solution and inner potential drain solution) are saturated or supersaturated with the compounds which normally tend to bleed out; and wherein the isotherm intersection of an ion-selective measuring chain with redox drain elements is optimally located in the middle of the measuring range such that this middle is located at ca. 0 mV.The device may be used for monitoring of groundwater with opposite changes in the concentrations of nitrate and ammonium, evaluated in a special device, with electronic data processing and intermediate data storage (in RAM pack) at the site of the measurement and data polling as needed to a central unit by telemetry.
Abstract: In air- and spacecraft and where drinking water supplies are scarce it is necessary to reuse the available water due to the limited tank volume available for the water supply. Such reuse calls for a water treatment. For this purpose a freeze concentration stage or preferably two such stages are integrated into a sequential waste water treatment system, including mechanical filters followed by the freeze concentration stage, which in turn is followed by micro- and ultrafiltration, reverse osmosis, and charcoal filter stages. A final stage includes a disinfection by ultraviolet radiation. The operation of the system is monitored by measuring the electrical conductivity of the water being treated. The use of one or two freeze concentration stages provides a universal cleaning capable of handling waste water of any composition. The selection of stages downstream of the freeze concentration stages is variable, depending on the degree of purification required.
Abstract: Method and device for counting clock pulses for the purpose of determining period length works in accordance with an absolute time measuring principle, provides at least a single main counter which runs uninterruptedly from the start of measurement to the end of measurement and a channel counter for each of a number n of measuring channels. By stopping a channel counter at the associated measurement period end and reading out the counter reading thereof as well as that of a supplementary upper main counter part which contains the higher-order count positions, a determination is made of the total time elapsed from the start of measurement up to the respective detected period end, and thereafter the target period lengths are determined by forming the difference of successive count values. The invention can be used, for example, for the high-precision measurement of the speed of a system rotating about an axis.
Type:
Grant
Filed:
April 28, 1994
Date of Patent:
August 8, 1995
Assignee:
Daimler-Benz AG
Inventors:
Helmut Gimmler, Ulrich Nester, Dinh D. Tu
Abstract: A process and an apparatus control output of an air-breathing fuel cell system which consists of an air supply line, a fuel cell, an air exhaust line, and a separate gas supply system for hydrogen gas. To control the fuel cell output, an adjustable rotary speed compressor is located in the air supply line and a variable absorption capacity expander is located in the air exhaust line. The compressor, the expander, and an additional electric motor are positioned on a common shaft. The expander converts the pressure energy contained in the exhaust air into mechanical energy and delivers that energy via the common shaft to the compressor. The air volume flow is controlled by the compressor rotary speed and adjusted to a preset value. A preset working pressure is established in the fuel cell system by adjusting the absorption capacity of the expander.
Abstract: A process and an apparatus humidify process gas for operating fuel cell systems. To ensure high efficiency, the process gas must be introduced at a predetermined temperature and humidity. A metered quantity of fine water droplets is injected into the gas supply line, by way of which the process air is humidified. If the fuel cell is operated under pressure, the process air generally has to be cooled after it has been compressed. The process air is automatically cooled as a result of a partial evaporation of the water droplets while the residual quantity of water in the form of droplets is introduced into the fuel cell.
Abstract: A high-temperature battery for a vehicle with an electric drive and that supplies the electric drive with power has a thermally insulating housing in order to avoid thermal losses. The battery also has a cooling system that limits the operating temperature during the charging and during the power drain. The dissipated heat of the cooling system is used to heat the vehicle. There is provision for the vehicle to be preheated during the charging of the battery so that during the driving mode the temperature to which the passenger compartment has been heated merely has to be maintained. Thus, even when the overall amounts of dissipated heat from the cooling system are low, heating to a comfortable degree is possible.
Type:
Grant
Filed:
March 24, 1994
Date of Patent:
July 11, 1995
Assignee:
Daimler-Benz AG
Inventors:
Dietrich Sahm, Diether von Scarpatetti, Rodger N. Bull
Abstract: A cable arrangement with two pairs of conductors for two separate circuits, one conductor of a pair is split into two partial conductors. Neutralization, i.e., capacitive and inductive uncoupling of the two circuits is possible by symmetrical arrangement of the conductors.
Type:
Grant
Filed:
November 1, 1993
Date of Patent:
June 27, 1995
Assignee:
Daimler-Benz AG
Inventors:
Jurgen Dorner, Sebastian Grimmeisen, Bernd Haussler, Thilo Kuhner, Franz-Josef Petry, Bernhard Rall
Abstract: Manufacture of a semiconductor array of integrated silicon-germanium heterobipolar transistors having a silicon collector layer, a silicon-germanium base layer, a silicon emitter layer and a silicon emitter contact layer includes depositing in a single uninterrupted process and simultaneously doping the collector layer, the base layer, the emitter layer and the emitter contact layer. A base connection region is formed at the side of the base layer such that the intersection surfaces of the base/emitter/PN boundary layer and of the base/collector PN boundary layer with the surface of the semiconductor array are outside the silicon-germanium base layer. A silicon dioxide layer is formed by thermal oxidation over the entire exposed surface of the semiconductor array.
Type:
Grant
Filed:
January 6, 1994
Date of Patent:
June 13, 1995
Assignees:
Temic Telefunken microelectronic GmbH, Daimler-Benz AG
Abstract: A method of determining a set value of the assisting force in a power steering system reduces the assisting force in the power steering system as a function of the steering angular velocity (LWG). An estimate of the general driving situation with respect to the cornering force taking place by a variable representing a set value (a.sub.yset) of the lateral acceleration is derived from the steering angle (LW), by determining a variable representing the lateral acceleration (a.sub.y) and by deriving a critical driving state from a deviation of the variable representing the lateral acceleration (a.sub.y) from the variable representing the set value (a.sub.yset) of the lateral acceleration above a threshold value. The reduction of the assisting force in the power steering system as a function of the steering angular velocity LWG takes place only as long as the critical driving state is detected.
Abstract: A method for displaying the impending danger due to speed associated with the driving situation of a vehicle and a display appliance for carrying out the method are described. In accordance with the method, a degree of danger is defined and calculated and displayed to the driver of a vehicle and, in fact, independently of whether the vehicle, as following vehicle, is driving too close to a vehicle in front or other obstacle (distance problem) or is driving too fast in fog (visual range problem). The signals necessary for this purpose are obtained from vehicle environment sensors, for example from a distance warning radar or distance recording radar and an infrared visual range measuring system, and are analyzed, together with vehicle condition signals, by a safety computer.
Type:
Grant
Filed:
April 28, 1993
Date of Patent:
April 25, 1995
Assignee:
Daimler-Benz AG
Inventors:
Horst Hahn, Wolfgang Lauer, Siegfried Reiniger
Abstract: A device for reducing drag in a rear region of a vehicle by extracting air through openings in a rear wall by blowers and blowing the air through further openings located a line of separation of the vehicle.
Abstract: A method and an arrangement for an integrated millimeter wave circuit wherein a Schottky diode and an HFET are produced in a quasi-planar arrangement from a semiconductor layer sequence. Due to the quasi-planar arrangement, the manufacturing process is simplified since particularly the contact regions of the Schottky diode and the HFET are produced simultaneously.
Abstract: A suspension system for motor vehicles has each wheel assigned a spring and a hydraulic unit and arranged in series with the latter. The ground clearance of the vehicle body can thus be altered wheel-by-wheel. A hydraulic feed system enables hydraulic fluid to be displaced between hydraulic units and allows pitching and rolling movements of the vehicle body to be counteracted.
Type:
Grant
Filed:
September 22, 1993
Date of Patent:
March 28, 1995
Assignee:
Daimler-Benz AG
Inventors:
Dietrich Sahm, Diether von Scarpatti, Dean C. Karnopp, David Beard
Abstract: A method that can be used not only for elimination of noise, for example in automatic speech recognition, but also to improve the voice quality for people, for instance during use of the speaker function of a car phone. The noise reduction is executed with two or multiple channels in such a manner that the temporal and architectural acoustical signal properties of speech and interference are utilized step-by-step and systematically. According to the method a pivotable, acoustic directional lobe is produced for the individual voice channels by respective digital directional filters and a linear phase estimation to correct for a phase difference between the two channels. The noise in the individual voice channels is estimated during speaking pauses, and the temporally stationary noise sources are damped by means of spectral subtraction. The individual voice channels are subsequently added whereby the statistical disturbances of spectral subtraction are averaged.
Abstract: A process is described for manufacturing a carbon particle filter having a plurality of channels which extend in the exhaust gas flow direction and which are alternatingly sealed at the upstream and downstream end of a porous ceramic material. To minimize the time required for producing the channels, a slip-like ceramic starting material is applied to a fabric having longitudinal threads corresponding to the size location and position of the channels and extending at least in the longitudinal direction of the filter. The carbon filter body is then formed by layering the coated fabric and thereafter in the course of the ceramic firing of the carbon filter body, its inlet and outlet channels are formed by burning away the longitudinal threads.
Type:
Grant
Filed:
February 27, 1989
Date of Patent:
February 21, 1995
Assignees:
Daimler-Benz AG, Gerhard Griebling
Inventors:
Wolfgang Bandel, Helmut Daudel, Gerhard Griebling, Alfred Normann, Friedrich Sperling