Matches 1 - 50 out of 144 1 2 3 >
Match Document Document Title
7377185 Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind  
A flow rate/liquid type detecting method for detecting the flow rate of a fluid and, at the same time, detecting any one of or both the type of the fluid and the concentration of the fluid,...
7337661 Thermal fluid flow meter having heat-generating resistor and temperature adjuster therefor  
A low-cost thermal flow meter that has good temperature characteristics and little variations. The thermal flow meter includes a sensor element including a heat-generating resistor and at least two...
7287424 Thermal type flow measurement apparatus having asymmetrical passage for flow rate measurement  
IN a thermal type flow measurement apparatus, a heating element is disposed in a fluid passage and generates heat by a passage of a current through itself. A first thermal sensitive element is...
7284424 Thermal air flow rate measuring apparatus and its flowmeter and internal combustion engine and thermal air flow rate measuring method using it  
A thermal air flow rate measuring apparatus of great precision wherein sensitivity is enhanced by sensors having different output characteristics and an operating device employing a digitized...
7272512 Flow sensor signal conversion  
A method of obtaining at least one representation of a characteristic function of a sensor from a test fluid during calibration of the sensor according to a sensor model having a transfer function...
7251995 Fluid flow sensor  
Two heat generating resistors are formed on a substrate in the upstream side with respect to an air flow direction and two other heat generating resistors are formed in the downstream side. A...
7225669 Heating resistance flow rate measuring apparatus  
A heating resistance flow rate measuring apparatus which can use a power source of an ECU in an automobile without requiring an expensive protective circuit and regulator. Heating of temperature...
7213455 Thermal type gas flow measuring instrument  
A thermal type gas flow measuring instrument measures gas flow with high precision by accurately correcting changes in radiation heat characteristics of a heating resistor due to contamination. The...
7205781 Mass air flow circuit having pulse width modulation feedback control  
A circuit for measuring the mass air flow rate through a duct is disclosed. The circuit includes a bridge circuit, a first amplifier, an oscillator, a comparator and a switch. The bridge circuit...
7201048 Measuring device for a flow sensor, in particular an air mass sensor for internal combustion engines and method for measuring air flows  
A measuring device for a flow sensor is provided, in which the drift is minimized.
7155970 Heat-radiation type flow sensor  
In a heat-radiation type flow sensor, a heater resistor is connected to a fixed resistor in series with a transistor. An electrical potential between the heater resistor and the transistor is...
7117736 Flow sensor  
A flow sensor ( 1 ) is constituted by a substrate ( 4 ) having a front surface ( 4 a ) side facing a channel ( 3 ) for a measurement target fluid ( 2 ), and a channel forming member ( 5 ) and a...
7082824 Variable resistance sensor with common reference leg  
A resistive bridge sensor circuit that includes a first resistive bridge circuit having a first variable resistance resistor and a second resistive bridge circuit having a second variable...
7072776 Method of regulating resistance in a discontinuous time hot-wire anemometer  
A system and method are provided to regulate resistance in a discontinuous time hot-wire anemometer. The solution removes supply voltage dependency on the mass airflow output signal. Operating the...
7066022 Airspeed sensor and method for operating an airspeed sensor  
In an air-velocity sensor and a method for operating an air-velocity sensor, the air-velocity sensor includes a temperature sensor arranged in an air flow and sequential electronics. The sequential...
7058532 Flowmeter  
A flowmeter for achieving a fluid flow rate value by using calibration curves on the basis of the output of a detection circuit using a bridge circuit ( 73 ) containing as constituent resistors...
7044714 System and method for controlling pumping of non-homogenous fluids  
A controller for controlling the pump unit of an oil well includes a sensor having a first and second probe for placement in the flow of oil from the well bore. Each of the probes contains a...
7013725 System and method for regulating bridge voltage in a discontinuous-time hot-wire anemometer  
In accordance with the teachings of the present invention, a system and method for regulating bridge voltage in a discrete-time hot-wire anemometer is provided. In a particular embodiment, the...
7011614 Infrared thermopile detector system for semiconductor process monitoring and control  
A thermopile-based detector for monitoring and/or controlling semiconductor processes, and a method of monitoring and/or controlling semiconductor processes using thermopile-based sensing of...
7010971 Heating resistor type flow-measuring device having a heating resistor and a thermoresistance, whose resistance value varies in response to the ambient temperature  
A heating resistor type flow-measuring device is capable of adjusting heating temperature of a heating resistor according to the ambient temperature as well as making the initial adjustment. A...
6935172 Thermal type flow measuring device  
A thermal type flow measuring device comprises a heating resistor(HF), a temperature measuring resistor(Ru) upstream of the heating resistor(HF) with respect to a fluid(Q), and a temperature...
6889544 Thermal type flow rate detector  
A thermal type flow rate detector includes: a bridge circuit constructed by upstream side and downstream side temperature detecting elements for detecting a temperature of fluid flowing from the...
6860149 Mass airflow measuring apparatus  
To offer a mass airflow measuring apparatus in which the effect of the adhesion onto the heating resistor caused while the engine is off is reduced and the measuring accuracy is improved. The...
6845659 Variable resistance sensor with common reference leg  
A resistive bridge sensor circuit that includes a first resistive bridge circuit having a first variable resistance resistor and a second resistive bridge circuit having a second variable...
6840102 Flow amount measuring apparatus  
The flow amount measuring apparatus has two detecting portions for generating signal indicative of flow amount respectively. The outputs of two detecting portions are subject to a differential...
6786088 Gas flow rate measuring apparatus  
An apparatus for measuring a gas flow rate, which includes one or more resistors arranged in a gas passage, and a gas flow rate detection circuit for outputting a gas flow rate detection signal in...
6769298 Gas flow rate measuring device having an integrated chip temperature sensor and adjustment processing circuit on common chip  
A flow rate signal analog-digital conversion circuit 30 , an adjustment processing circuit 40 and a chip temperature sensor circuit 60 are disposed a single semiconductor chip 100 to form an...
6763711 Air flow sensor using measurement of rate of heat loss  
An air flow sensor including a temperature dependent resistor device, a first circuit and a second circuit. The first circuit applies a voltage to the temperature dependent resistor device until it...
6752014 Hot-wire type air flow meter for internal combustion engine  
A hot-wire type air flow meter for an internal combustion engine has an exothermic resistor film provided on a thin portion formed on a silicon substrate and a control circuit for controlling a...
6681625 Constant-temperature-difference bidirectional flow sensor  
A bidirectional flow sensor ( 800 ) for automated systems includes a heater ( 18 ) which is maintained at a constant temperature above the temperature of the fluid flowing past the heater. A pair...
6658931 Fluid flow sensing and control method and apparatus  
A gas mass flow sensor or probe ( 35, 37, 39 ) of an air flow sensing and control system ( 17, 19, 21 ) based upon hot-wire type devices where flow sensing is achieved by controlling the difference...
6575027 Mass flow sensor interface circuit  
An improved mass flow sensor interface (“MFSI”) circuit and method are disclosed for sensing and measuring mass flow rate of a gas and provide an output voltage proportional to the mass flow...
6543282 Air flow detection apparatus  
An air flow detection apparatus useful in operating an accessory item in an HVAC system includes a sensor printed circuit board assembly having a first thermistor adapted to be exposed to an air...
6539793 Flow rate detector  
The invention provides a flow rate detector capable of precisely detecting a flow rate of an object fluid and effectively reducing a leaning error even when the object fluid is pulsating, thereby...
6539792 Method and apparatus for balancing resistance  
A sensor that includes a first resistor, a second resistor, a first circuit, and a second circuit. The first and second resistors each has a resistance that varies in response to a change in a...
6508117 Thermally balanced mass air flow sensor  
A bi-directional mass air flow sensing device for measuring air flow, comprising a bridge circuit coupled across a voltage potential, wherein the bridge circuit comprises a first side including...
6474155 Constant-temperature-difference flow sensor  
An integrated sensor for automated systems includes a flow sensor, a temperature sensor, and a network interface. In a particular embodiment of the invention, the flow sensor includes a temperature...
6470741 Hot wire anemometer gas flow sensor having improved operation and compensation  
A hot wire gas flow rate sensor having a bridge circuit with a sensing resistor avoids saturation of the signal processing circuitry at high gas flow rates by increasing a bias signal to a...
6386030 Balanced bridge temperature regulator for an air-mass flow meter  
A temperature regulator, circuit for an air-mass flow meter in which the temperature regulator circuit includes a bridge circuit one of whose bridge branches contains a temperature resistor of...
6370950 Medium flow meter  
The invention relates to a device for measuring the flow of a medium e.g., a gaseous medium or a fluid medium, which device is based on measuring and affecting the temperature distribution of a...
6349596 Thermal type air flow sensor  
A thermal type air flow sensor which corrects variation of characteristics of a thermal type air flow sensor due to adherence or deposition of fouling contained in an intake air for maintaining an...
6327905 Air flow measurement apparatus  
An improved heating resistor type air flow measurement apparatus which can operate properly even when the noises are produced by a large surge current, and even when the air flow measurement...
6318169 Heat sensitive flow meter  
A heat sensitive flow meter comprising a power source for changing an offset voltage ΔE at the time of application of a power voltage. The power source is connected to the non-inversion input...
6318168 Thermal dispersion probe with microcomputer controller  
Thermal dispersion probes used as flowrate sensors in process control of a medium heated by a heater. The device includes a reference temperature sensor for producing an electrical signal...
6223593 Self-oscillating fluid sensor  
A method and apparatus for determining selected fluid properties using a self-oscillating fluid sensor. In a preferred embodiment, a sensor is provided that oscillates at a frequency that is...
6205854 Heat-sensitive type flow sensor  
A heat-sensitive type flow sensor which can be manufactured by using discrete parts at low cost in a miniature size with high accuracy and reliability includes a correcting circuitry capable of...
6047597 Device for finding the flow rate of a flowing medium  
A device for determining the throughput of a flowing medium is described, wherein a heater resistor heats at least one upstream and downstream located, temperature-dependent resistor, wherein the...
6032525 Thermosensitive flowmeter for detecting flow rate of fluid  
A thermosensitive flowmeter includes a first thermosensitive resistor "Rh" for detecting a flow rate of a fluid in a fluid passage 19, a second thermosensitive resistor "Rk" for detecting an...
5965813 Integrated flow sensor  
A flow sensor comprises a heater module, a fluid temperature sensor and a Wheatstone bridge module. In the heater module, a heater is disposed very close to a heater temperature sensor and an...
5948978 Induction heated mass flow sensor  
Sensors for measuring the flow rate of a fluid and for monitoring heat transfer. An induction-heated temperature-responsive sensor in contact with and cooled by the fluid, changes temperature in...
Matches 1 - 50 out of 144 1 2 3 >