880 results about "Air flow meter" patented technology

An environmental monitoring and controlling system for a ventilated cage and rack system that monitors and measures air flow in the rack at either the rack or cage level. At the rack level, two pressure sensors are provided in a supply air system to accurately monitor the air flow rate into the rack. In addition, two pressure sensors may be provided in an exhaust air system to accurately monitor the air flow rate out of the rack. At the cage level, a cage may be equipped with a highly accurate pressure sensor, including a Venturi tube and thermistor, the monitor the air flow rate in a cage located at any cage position in the rack.

A control system for a direct-injection four-stroke internal combustion engine having at least one cylinder, an intake passage supplying air to the cylinder, and an exhaust passage removing exhaust gas from the cylinder, the control system including a mass air flow meter configured to detect a mass air flow upstream of the cylinder and a control unit. The control unit is configured to detect an intake air density in the cylinder, calculate an in-cylinder trapped intake air amount based on a cylinder volume and the detected intake air density, and estimate a difference between the intake air amount detected by the mass air flow meter and the in-cylinder trapped intake air amount, the estimated difference being an estimated scavenging amount representing a fresh air blowby amount passing from the intake passage into the exhaust passage.

An engine has a PCV passage connected to an intake system for recirculating a blow-by gas to the intake system and an air flow meter provided upstream of a connection between the PCV passage and the intake system in the intake system for sensing an intake air flow rate. An electronic control unit (ECU) performing various types of control of the engine diagnoses a clogging abnormality of the PCV passage based on pulsation width of the intake air flow rate sensed with the air flow meter. A thermal type sensor having a heating section and a temperature sensing section provided on a semiconductor substrate is used as the air flow meter.

An opening is provided for an exhaust bypass pipe that bypasses an exhaust turbine of an exhaust turbine supercharger. According to the opening, an exhaust gas amount bypassing the exhaust turbine is calculated. An exhaust gas amount supplied to the exhaust turbine is found by subtracting the waste-gate-valve-passing gas amount from an intake air amount (exhaust gas amount) detected by the air flow meter. A rotational speed of the exhaust turbine is calculated from this turbine-supplied gas amount. An estimated boost pressure is calculated from this rotational speed of the exhaust turbine. Consequently, a boost pressure can be accurately estimated without using a boost pressure sensor even under such conditions as to disable detection of boost pressures or degrade the detection accuracy in a system using a conventional boost pressure sensor.

An engine exhaust system includes a catalytic converter. An inlet sensor senses a first oxygen level of exhaust gases entering the catalytic converter. An outlet sensor senses a second oxygen level of exhaust gases exiting the catalytic converter. A controller communicates with a fuel system of an engine, the inlet sensor, and the outlet sensor. The controller initiates a rich condition after a fuel cut-off period and calculates a mass of oxygen released by the catalytic converter based on a mass air flow into the engine. The controller calculates a target oxygen storage capacity (OSC) of the catalytic converter over a target time period.

The invention discloses a device for testing synthesis and decomposition parameters of hydrate sediment, which comprises a pressure chamber. The inlet end of the pressure chamber is provided with an air inlet flow meter, an injection pump and an ultrasonic transmitting end; the outlet end of the pressure chamber is provided with an ultrasonic receiving end, a gas-liquid separator and an air outlet flow meter; a TDR measurer and a plurality of detection points are arranged in the inner cavity of the pressure chamber along the length direction thereof; and the axial section where each detection point is positioned is provided with a temperature sensor and a pressure sensor. The device and a method thereof in the invention can acquire multiple basic parameters such as stress strain, seepage, heat, wave, content of each component and the like, and can provide different ambient pressures to simulate the pressure in the actual hydrate sediment stratum, wherein the maximum ambient pressure can reach 30MPa. The gas amount of the hydrate sediment in synthesis and decomposition can be measured by the fine flow meter. The device is lighter, has a small volume and is convenient to move; and the device can be conveniently put into other measurement devices such as CT, chromatograph and spectrometer for microcosmic real-time observation.

Metering combustion control in a fired equipment is disclosed in which both the fuel flow rate and the combustion air flow rate are metered in a desired ratio corresponding to a master firing rate demand, and the master firing rate demand combustion air flow directed to the combustion air regulating element is trimmed in response to an error based correction adjustment determined from the respective values of the fuel flow meter and combustion air flow meter input signals to drive the ratio between the fuel flow rate and the combustion air flow rate toward the desired ratio for controlling the combustion in accordance with the master firing rate demand.

A thermal type air flow meter that makes it possible to precisely and easily determine whether a sensor element is a non-defective or a defective by screening is provided. First and second diaphragm sections composed of an electrical insulating film are formed in a semiconductor substrate. A heating resistor and a resistor for intake air temperature sensor are disposed on them to obtain a sensor element for thermal type air flow meters. The length of the short sides W1 of the rectangular first diaphragm section is made substantially equal to the length of the short sides of the second diaphragm section rectangular as well. Thus, the pressures applied to each of the diaphragm sections are substantially identical with each other in pressurization during screening.

A thermal type air flow meter that is capable of suppressing deformation of a base member at the time of molding is disclosed, to thereby secure dimension accuracy and reduce an influence of a dimension change on measuring accuracy. The meter includes a housing member placed in an intake passage of an internal combustion engine, and a base member fixed to the housing member and includes a secondary air passage into which part of air passing through the intake passage flows. The base member is a plate-like resin molded component formed of a synthetic resin material and includes a reinforcing structure integrally formed between a board fixing part to which a circuit board is fixed; and a secondary passage constituting part formed at a leading end part of the board fixing part, the reinforcing structure enhancing strength of the base member.

An air flow sensor for an internal combustion engine is disclosed. An air flow rate measurement meter, a pressure gauge, electronically controlled throttle body, and the microcomputer, etc. are integrated as one body, and the correction of the air flow rate, the control, and the fault diagnosis, etc. are done in the integrated microcomputer.The air flow sensor outputs an air flow rate signal in which the error is deleted to suppress the discharge of the harmful exhaust gas from the internal combustion engine, carries out the self-diagnosis of the breakdown of the air flow sensor or the electronically controlled throttle body to prevent the accident beforehand, and controls to obtain the best intake air amount.

A system for monitoring the environment in a rack having a plurality of cages for housing a plurality of laboratory animals, the rack receiving an input air flow from an external air supply unit through an input conduit, and exhausting an air flow output from an output conduit. The system may comprise a supply air system coupled to the input conduit for monitoring the input air flow to the rack in an input air flow direction. The supply air system may comprise a flow tube, through which the air flows, an air flow sensor located within the flow tube for determining the air flow rate taken at a location along the input air flow direction, and for providing an indication of the flow rate, an air flow stabilizer located within the flow tube at a location upstream from the flow sensor, for stabilizing the air flowing to the air flow sensor, and a microcontroller for receiving the indication of the determined air flow rate from the air flow sensor and for monitoring the air flow to the rack. Similarly, an exhaust air system coupled to the output conduit for monitoring the output air flow from the rack in an output air flow direction may be used instead of, or in conjunction with the supply air system. Further, the system may be implemented at either the rack or cage monitoring and/or control levels.

A device for delivering a fluid to a target site is disclosed in one embodiment of the invention as including a pump, a flow modulator, a flow meter, and a controller. The pump may generate a fluid stream characterized by a flow rate. The flow modulator may smooth out irregularities in the flow rate, thereby generating a second fluid stream having a second flow rate that is substantially more uniform than the first flow rate. The flow meter may measure the flow rate of the second fluid stream. The controller may then compare the flow rate of the second fluid stream to a target flow rate, and adjust the pump speed to substantially align the second flow rate with the target flow rate.

In order to improve a measurement accuracy of a mass flow meter, the mass flow meter comprises a flow rate calculating section that obtains an output signal from a sensor section having a thermosensitive resistive element arranged in a flow channel where a sample gas flows and that calculates a flow rate of the sample gas, a pressure measuring section that measures a primary side pressure in the flow channel, and a flow rate correcting section that corrects the measured flow rate obtained by the flow rate calculating section by the use of the primary side pressure obtained by the pressure measuring section and a gas coefficient determined by an isobaric specific heat of the sample gas.

An engine ECU executes a program including the steps of: determining an airflow meter as abnormal when the number of times an injector is determined as abnormal (abnormality determination count C) is greater than a threshold value C(0) in all of a region where DI ratio r=100%, a region where DI ratio r=0%, and a region where 0%<DI ratio r<100%, and determining the airflow meter as normal when abnormality determination count C is smaller than the threshold value C(0) at least in any one region.

The invention provides an intelligent control method of a blast aeration system of a municipal sewage plant. The blast aeration system comprises aeration tanks, a dissolved oxygen tester, an air blower, an air supply header pipe and supply branch pipes, wherein a header pipe pressure gage and a header pipe air flow meter are arranged on the air supply header pipe, and a branch pipe air flow meter and a valve are arranged on each supply branch pipe. The intelligent control method is characterized in that a controller estimates current load by aid of a dissolved oxygen balancing model according to current dissolved oxygen concentration and change rate of each aeration tank, the needed air supply amount is estimated according to the estimated load and the current dissolved oxygen concentration, parameters of the air blower are adjusted so as to lead the total air supply amount of the air blower to be identical to the sum of the air supply amount needed by all the branch pipes, and simultaneously the opening degree of the valve arranged on each branch pipe can be adjusted so as to lead the air supply amount needed by all the aeration tanks to be identical to the flow amount fed back by the branch pipe air flow meter arranged on each branch pipe. The controller is used for gradually adjusting the parameters of the air blower so as to lead the largest opening degree of each branch pipe valve to be kept above the lowest set limit and further to lead pressure of the air supply header pipe to be the smallest.

Provided is a sound generating device (20) for a vehicle, including: a plurality of pressure sensors (21a to 21d) for detecting air pressures of an air intake sound of an engine (12) and outputting the air pressures as sound pressure signals; a signal processing unit (24) for performing processing of changing the sound pressure signals in accordance with a driving condition of a vehicle (10); and loudspeakers (28a and 28b) for outputting the sound pressure signals as the air intake sound of the engine (12). Then, the plurality of pressure sensors (21a to 21d) are provided at an interval in a circumferential direction of an outer periphery of an air intake duct (15) at positions in a vicinity of an air flow meter (18) on an air cleaner (16) side with respect to a center of the air intake duct (15), the air intake duct (15) connecting the air cleaner (16) to a throttle body (17).

The invention discloses an online monitoring analyzer and a monitoring system for sewage biotoxicity. The analyzer is in an integrated cabinet structure and the cabinet structure comprises an upper cabinet space and a lower cabinet space; the upper cabinet space is used for mounting a control system, a data collection and analysis system and a touch screen; the lower cabinet space is divided into front and back parts; the front and back parts are separated by a detachable separation plate; and the detachable separation plate is fixedly provided with a feeding pump, an air flow meter, a solenoid valve and a pipeline. The analyzer disclosed by the invention is in the integrated cabinet structure and is formed by an air-liquid conveying system, a wet type biochemical reaction system, an automatic control system and a data collection, processing and communication system; and the analyzer is used for online identification and early warning for the biotoxicity of the incoming sewage of a sewage treatment plant, prevents the sewage treatment efficiency from being influenced due to the reason that active sludge is poisoned by toxic components in the sewage, and has the characteristics of full-automation in operation, rapidness and accuracy in analyzing, simplicity in installation, convenience in maintenance and the like.

In a thermal-type airflow meter that measures an intake airflow rate in an internal combustion engine of an automobile or the like, there has been a problem that pulsation errors caused by external fluctuations under the environment including a large pulsation and reverse flow in the intake valve are difficult to be reduced. In order to solve this problem, the invention provides a flowmeter comprising a detection element that outputs a non-linear signal corresponding to a flow rate, and a regulation means that regulates an output signal of the detection element for controlling. With this construction, the regulation means executes output regulation processing that regulates irregularities of the detection element in the output signal, and inequality linearization processing that regulates an average value of the output signal after the output regulation processing by means of regulating parameters.