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5050428 |
Apparatus for measuring air flow intake of internal combustion engine
An apparatus for measuring an air flow intake of an internal combustion engine which comprises an air flow sensor for measuring the level of the air flow intake and an interface circuit for...
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5044196 |
Method and apparatus for detecting deterioration of a hot-wire type sucked air flow quantity-detecting device for an engine
The present invention relates to a method and apparatus for detecting deterioration of a hot-wire type sucked air flow quantity-detecting device of an engine, in which the change ratio of the...
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5036702 |
Air flow meter with compensation of second stage delay of thermal inertia
A hot wire type air flow meter employing a hot wire temperature dependent resistor having a heat generating portion and a non-heat generating portion comprising a feedback control circuit...
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5036701 |
Mass-flow meter with temperature sensors
Mass-flow meter with temperature sensors, designed for measuring mass flow rates of liquids or gases, containing a heat conductive tube, through which the mass flow to be measured occurs and of...
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5014550 |
Method of processing mass air sensor signals
A mass air flow meter has a time lag which varies according to the air flow rate. A digital filtering method enhances the raw meter output signal by calculating a correction term based on varying...
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4987549 |
Temperature compensated flowmeter techniques
A bridge-type "hot wire" flowmeter is temperature compensated by selecting the values of a power resistor, a ballast resistor and a calibration resistor in accordance with an iterative numerical...
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4961348 |
Flowmeter fluid composition correction
A method for correcting the flow measurement of a gaseous fluid of interest for changes in the composition of that fluid in a flowmeter of the microanemometer class is disclosed in which an...
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4959990 |
Combined mass flow/pitot tube meter
A mass flow meter probe having an upstream tube and a downstream tube that extends into a main gas flow conduit is disclosed. The sensor for the mass flow measurement is located in the bore of a...
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4934189 |
Temperature sensing flow sensor
A temperature sensing type flow sensor including a control pulse generating circuit for generating a pulse signal having a time ratio which corresponds to the output from a bridge circuit which...
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4907446 |
Flow sensor incorporating a thermoresistor
A thermal flow sensor constructed by a temperature control circuit which includes a bridge circuit consisting of a thermoresistor arranged in a fluid passageway and a plurality of resistors, and a...
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4905514 |
Method and apparatus for measuring fluid flow
A method and apparatus for the measurement of fluid flow through a conduit comprises determining, from one or more measuring elements, a first value related to the velocity of fluid flowing through...
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4885938 |
Flowmeter fluid composition correction
Certain relationships among the mass flow signal the thermal conductivity, specific heat and density of the fluid measured can be used to correct a mass flowmeter measurement with respect to...
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4860583 |
Air velocity transmitter device
An instrument probe has two sensing elements; one is a self heated thermistor that serves as the air velocity sensor, and a second sensing element in the form of a chip thermistor, that are...
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4852027 |
Method to quantify thermal dissipative mechanisms in biomaterials
A method for determining the properties of a medium by activating temperature changing means to change the temperature of the medium from a first unperturbed temperature to a second different...
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4821700 |
Device for determining mass flow and direction of flow
In order to determine the correct mass flow of a rapidly pulsating stream of fluid, in particular in the intake duct 10 of an internal combustion engine, a device for determining the mass flow and...
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4794794 |
Thermal anemometer
A thermal anemometer, including a constant temperature anemometer bridge excitation circuit together with multiple signal comparators and a tapped resistance reference divider, providing a...
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4790181 |
Thermal mass flow meter and method of making same
A thermal mass flow meter includes a comb-shaped structure having a plurality closely spaced septa carried from a common spine and disposed within the flow stream to be measured for partitioning...
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4781065 |
Solid-state anemometers and temperature gauges
A solid state temperature and/or anemometer measuring instrument for a fluid medium such as atmosphere the instrument including a pair of semi conductor junction means such as a zener diode one of...
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4739657 |
Resistance with linear temperature coefficient
The sensors and heater of a microbridge flow sensor are each compensated for non-linear curvature of the resistance versus temperature curve by the use of a section of permalloy in series with a...
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4686450 |
Fluid flow sensor
A fluid flow sensor especially adapted for use in solid state electronic system. The sensor employs a heated thermistor in a first sensing network with a temperature compensation means, the two...
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4680963 |
Semiconductor flow velocity sensor
A semiconductor flow velocity sensor having a semiconductor substrate and an electrical heating unit arranged on the substrate. The sensor located in the fluid flow to be measured can electrically...
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4649745 |
Apparatus for measuring a flow rate of intake air for an engine
An apparatus for measuring a flow of intake air to an engine includes a bridge circuit including a heat resistor placed in an intake air path of the engine, a resistor for sensing the temperature...
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4596140 |
Constant overheat anemometer with sensor lead wire impedance compensation
An improved bridge-type hot-wire constant overheat anemometer having current controlled temperature compensation circuitry, whereby matched sensors may be employed. Independent voltage sensing and...
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4578996 |
Gas-flow measuring apparatus and method
A gas-flow measuring apparatus and method providing an accurate measurement of the gas-flow in, for example, an internal combustion engine. The quantity of the gas-flow is measured with a measuring...
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4576039 |
Air-flow detecting apparatus
This apparatus measures and detects the air-flow taken into an intake pipe of an internal combustion engine, and includes an air-flow detecting sensor. The air-flow detecting sensor comprises a...
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4571990 |
Method and apparatus for measuring the rate of air flow in the intake tube of an internal combustion engine
The invention is directed to a method and an apparatus for measuring the air-flow rate in the intake tube of an internal combustion engine using a flow-measuring device which is insensitive to the...
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4571991 |
Air flow measuring apparatus
An air flow detecting element is located in the air flow to be measured. This air flow detecting element comprises a heater made of resistant material having a positive temperature coefficient and...
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4555937 |
Method for measuring the flow rate of pulsating medium having a backflow
A method is proposed for measuring the flow rate of the pulsating air mass aspirated by an internal combustion engine when there is a backflow. To this end, an integration process in one direction...
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4537068 |
Thermal anemometer
A thermal anemometer arranged to measure air velocity over a wide range of ambient temperatures and velocities, and a method of measuring such air velocity free of influence of ambient temperature,...
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4523462 |
Constant temperature anemometer having an enhanced frequency response
A constant temperature anemometer having an enhanced frequency response. A sensor element is included within one leg of a bridge circuit with a feedback circuit being operatively connected to the...
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RE31906 |
Control system for internal combustion engine
A control system including a microprocessor for controlling the controlled variables of an internal combustion engine, especially, the flow rate of fuel is disclosed. An air flow meter provides an...
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4510795 |
Method for measuring air flow
A method is proposed for measuring the throughput of a medium, in particular the air aspirated by an internal combustion engine, in a flow cross section and for correcting the flowthrough...
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4475388 |
Thermal flowmeter with temperature compensation
A method for measuring the flow rate of fluid such as liquified petroleum gas fuel for an automobile fuel. A signal of the fluid flow rate and a signal of the fluid temperature are produced by...
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4458529 |
Hot wire flow meter
A hot wire flow apparatus for generating a flow rate signal indicative of the actual flow rate of a pulsating fluid flow. The apparatus utilizes a wire element connected with a temperature...
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4457167 |
Method for measuring the pulsating air mass aspirated by an internal combustion engine
A method is proposed for measuring the pulsating air mass aspirated by an internal combustion engine in a flow cross section. To this end, an upper reference value (U or ) is determined from the...
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4449397 |
Apparatus for measuring the mass of a pulsating medium flowing in a flow cross-section
An apparatus for measuring the mass of a pulsating medium flowing in a flow cross-section, in particular for measuring the aspirated air mass of internal combustion engines. The apparatus includes...
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4437339 |
Linearizing and control circuit for air flow rate meter
An electrically controlled fuel metering system having an air flow rate meter device in the air intake tube and a subsequent linearizing circuit layout is proposed. The linearizing circuit layout...
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4417471 |
Gas flow measuring device
A first temperature dependent resistor and a second temperature dependent resistor are disposed within a single gas passage defined by a branch pipe extending into a conduit for a gas whose flow...
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4404846 |
Air flow rate measuring device incorporating hot wire type air flow meter
The invention relates to an air flow rate measuring device making use of a hot wire type air flow meter and adapted to measure the true intake air flow rate while compensating for the error...
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4319483 |
Method of automated fluid flow measurement
An automated fluid flow measurement system employs two temperature sensitive silicon resistors having tracking temperature coefficients. The resistors have equal impurity concentration but...
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4311042 |
Fuel control measuring apparatus for internal combustion engine
Apparatus for controlling the supply of fuel to an internal combustion engine. The apparatus includes a hot-wire air flow meter and a smoothing circuit connected electrically to the output of the...
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4264961 |
Air flow rate measuring apparatus
An apparatus for measuring the flow rate of suction air in an internal combustion engine in which the heat radiation characteristic of a heat generator disposed in the suction air passage, which...
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4255968 |
Flow indicator
An all solid state transducer and electronic system is disclosed for measuring flow through the use of a small, low temperature heater. The heater transmits an amount of heat to the flowing medium...
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4196622 |
Method and apparatus for improving the reliability of an airflow measuring system
Undesired deposits accummulating on the surface of a temperature-varying airflow sensing resistor are burned off periodically by increasing the current through it. To eliminate errors caused by a...
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4193300 |
Signal linearizing circuit for internal combustion engines
A circuit arrangement for linearizing the output signal of a probe such as a hot-wire probe used for quantitative air measurement in the intake manifold of an internal combustion engine which...
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4083244 |
Method and apparatus for measuring fluid flow and/or for exercising a control in dependence thereon
Apparatus for determining fluid flow, said apparatus comprising flow obstruction means and two heat-emitting members which are mounted in a geometrically symmetrical arrangement in a conduit, the...
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4059982 |
Apparatus for the measurement of thermal properties of biomaterials
Appropriate heating and temperature sensing means are immersed in a medium the thermal conductivity, k, and thermal diffusivity, α, of which are to be determined both in the presence of and in the...
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3942378 |
Fluid flow measuring system
A fluid flow measuring system utilizing semiconductor devices as heating and temperature sensitive elements produces an electrical output signal which is linearly proportional to the rate of flow...
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3891391 |
Fluid flow measuring system using improved temperature compensation apparatus and method
Fluid flow measuring apparatus employing a self-heated thermal element which is compensated for fluid temperature variations is disclosed. The apparatus utilizes electrical circuitry for separating...
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3535927 |
COMPENSATED THERMISTOR SENSOR
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