摘要:
A method for measuring an air mass flow flowing in a main flow direction, and a hot-film air mass meter by which the method is able to be realized. The method and the hot-film air mass meter are especially suitable for use in the induction tract of an internal combustion engine. The hot-film air mass meter includes a sensor chip having a chip surface across which an air mass flow is able to flow. The chip surface in turn has a measuring surface, the measuring surface including a central hot-film air mass meter circuit having at least one central heating element and at least two temperature sensors. The method is implemented so that the at least one central heating element is periodically heated using a frequency ω. With the aid of at least two temperature sensors, at least two measuring signals are detected. The measuring signals and/or at least one differential signal of the at least two measuring signals are modulated using the frequency ω.
摘要:
A micromechanical structure, includes at least two structure sections configured to bound a working gap, the at least two structure sections being movable relative to one another, and a working gap width setting device configured to broaden the at least one working gap by movement of a first structure section of the at least two structure sections relative to a second structure section of the at least two structure section, the first structure section is stationary relative to a reference point during operation of the micromechanical structure and (ii) the second structure section is movable relative to the reference point during operation.
摘要:
An electric motor, in particular a starter device for internal combustion engines in which a current-limiting electric resistor (57) with a negative temperature coefficient is connected at the beginning of the main current path (49) of an electromagnetically excitable rotor (53) of the electric motor (16). The electric resistor (57) contains at least one monocrystalline semiconductor.
摘要:
An integrated microstructure sensor element is proposed for detecting thermodynamic measured variables of a fluid. To that end, a supporting body, particularly a board or a wafer having at least one microstructured heating element in contact with the fluid during operation, is provided, on which or in whose vicinity are arranged first arrangement for at least intermittently acting on the heating element with an electric alternating current of defined frequency or a defined frequency band, as well a second arrangement for detecting the amplitude of the third harmonic wave of the electric voltage applied to the heating element. The proposed microstructure sensor element in the form of a compact, integrated component is suitable in particular for determining or monitoring the thermal conductivity and/or the thermal capacity of a fluid, particularly an oil in a motor vehicle.
摘要:
An electric motor, in particular a starter device for internal combustion engines in which a current-limiting electric resistor (57) with a negative temperature coefficient is connected at the beginning of the main current path (49) of an electromagnetically excitable rotor (53) of the electric motor (16). The electric resistor (57) contains at least one monocrystalline semiconductor.
摘要:
A method for measuring an air mass flow flowing in a main flow direction, and a hot-film air mass meter by which the method is able to be realized. The method and the hot-film air mass meter are especially suitable for use in the induction tract of an internal combustion engine. The hot-film air mass meter includes a sensor chip having a chip surface across which an air mass flow is able to flow. The chip surface in turn has a measuring surface, the measuring surface including a central hot-film air mass meter circuit having at least one central heating element and at least two temperature sensors. The method is implemented so that the at least one central heating element is periodically heated using a frequency ω. With the aid of at least two temperature sensors, at least two measuring signals are detected. The measuring signals and/or at least one differential signal of the at least two measuring signals are modulated using the frequency ω.
摘要:
A capped microsensor is described. It is suggested that a current conductor, positioned in the cavity and having at least two voltage taps, be provided, this configuration being used for seal testing, e.g., during quality control, by detecting at least one thermodynamic variable of a gaseous medium present inside the cavity via this configuration.
摘要:
A capped microsensor is described. It is suggested that a current conductor, positioned in the cavity and having at least two voltage taps, be provided, this configuration being used for seal testing, e.g., during quality control, by detecting at least one thermodynamic variable of a gaseous medium present inside the cavity via this configuration.