A fluid flow sensor, or mass flow sensor, is provided with a means for directing particulate matter away from a semiconductor flow sensor. In addition, the mass flow sensor of the present invention is provided with a housing structure that allows the flow sensor to be disposed proximate a central region of a main conduit. The housing structure is provided with an upstream port and a downstream port which divert a flow of fluid in thermal communication with a flow sensor which is disposed within a chamber provided in a housing structure. A second directing means disposed within the housing structure causes the diverted stream to pass in intimate thermal communication with the flow sensor. Additionally, a fluid deflector is provided to prevent the diverted flow stream from abruptly striking the leading, or upstream, edge of a carrier device to which the flow sensor is attached. This deflector assists in the prevention of turbulent flow that could otherwise be caused by the fluid striking the upstream edge of the carrier apparatus.

Mass air flow sensor

The necked down transitional nozzle or channel leading to the measurement channel of a compact microanemometer gas meter having an open sensor is modified by introducing a flattened sector opposite the mounted sensor to eliminate particulate matter from being scattered in the direction of the sensor.

Safe channel design for flow sensor chip microbridges

An air mass meter has a heating element (6) in a channel component (1) and a baffle (11) downstream of the heating element (6). The heating element (6) and the baffle (11) are geometrically shaped and arranged in the channel component (1) in such a way that the heating element (6) is surrounded by a laminar flow (18) at all flow rates relevant to the operation of an internal combustion engine. The heat applied to the heating element (6) is thus determined only by the mass of the air flowing past it.

Air mass meter

Magnetic inductive flow meter has grounding disc (8') which is made up from electrically conductive plastic which is sealed to the front side (2) of the measuring tube (1) for arrangement, for a direct contact to the mass. The grounding disc is formed as single piece to the electrically insulated internal layer (7).

Magnetic-inductive flow meter with a grounding disk

A system for compensation of contamination of a heated element in a heated element gas flow system in which the heated element becomes heated from an ambient temperature to an elevated temperature upon the application of electrical power to the heated element during a startup time period. The system includes a processing circuit having an input and an output. A voltage signal from the heated element is connected to the input of the processing circuit. The processing circuit reads a plurality of temporally spaced input signals as data from the processing circuit input during the startup time period. The processing circuit then computes the parameters of a transfer function corresponding to the data on its input. The processing circuit then calculates a contamination correction factor as a function of at least one parameter of the transfer function. The processing circuit then utilizes the correction factor to modify a measured gas flow rate by the gas flow meter after the heated element attains the elevated steady state temperature to compensate for contamination of the heated element.

System and method for compensation of contamination of a heated element in a heated element gas flow sensor

When an air flow rate meter is used in the intake tube of internal combustion engines, such a meter typically having a flat substrate with at least one resistor film disposed on it, the problem arises of dirt deposits on the substrate end face facing into the flow, which cause undesirable changes in the characteristic curve compared with the calibrated new state of the air flow rate meter. The novel embodiment of the air flow rate member is intended to enable calibration based on conditions expected in practice. To produce the effect, while the air flow rate meter is new, of long-term soiling of an air flow rate meter substrate over a period of operation, a leading body, for instance shaped as a U, is disposed on the end face of the substrate facing into the flow. The leading body simulates a soiled effect while the air flow rate meter is still new, and this effect is taken into account in the calibration. The leading body may be of electrically conductive plastic or lacquer and may be connected to a ground line (15). The air flow rate meter is quite generally suitable for measuring flowing media.

Air flow rate meter and method for producing an air flow rate meter

In the use of an apparatus for measuring air masses in the intake pipe of internal combustion engines, which apparatus as a rule has a plate-shaped carrier body with at least one resistance layer arranged thereon, the problem of dirt deposits on the carrier body end face facing the flow arises, which results in undesired changes in the characteristic line as compared with the calibrated new state of the air mass-measuring instrument. The new design of the air mass-measuring instruments is intended to allow a calibration more suitable in practice. In order to produce the effect of long-term fouling arising in operation on the carrier body (18) of an air mass-measuring instrument even in the new state, a front body (23), which can, for example, have a U-shaped form, is provided on the end face (19), facing the flow (2), of the carrier body (18). A fouling effect, which is also taken into account in the calibration, is simulated by the front body (23) even in the new state of the air mass-measuring instrument. The front body (23) can consist of an electrically conductive plastic or paint and be connected to an earth line (15). The air mass-measuring instrument is quite generally suitable for the measurement of flowing media.

Apparatus for measuring air masses and method for producing an apparatus for measuring air masses

A method for producing an air flow rate meter substrate which includes at least one resistive film on one side of the substrate with a teardrop end face that faces the direction of air flow to be determined, formed by dipping the face end of the substrate into a liquid plastic or a lacquer composition.

Wuensch Werner

Papers

Air flow rate meter and method for producing an air flow rate meter

Apparatus for measuring air masses and method for producing an apparatus for measuring air masses

Method for producing an air flow rate meter substrate

Air mass measuring device and method for the manufacture thereof