2884 results about "Gas pressure transducer" patented technology

The present invention is directed to a sensor network that includes a number of sensor units and a base unit. The base station operates in a network discovery mode (in which network topology information is collected) in a data polling mode (in which sensed information is collected from selected sensory units). Each of the sensor units can include a number of features, including an anemometer, a rain gauge, a compass, a GPS receiver, a barometric pressure sensor, an air temperature sensor, a humidity sensor, a level, and a radiant temperature sensor.

A wheel-state obtaining apparatus for a vehicle, including wheel-side devices (10-16) each having an air pressure sensor (32) for detecting an air pressure of a wheel tire of the vehicle, and a body-side device (18) having receiver antennas (20-26) and arranged to receive wheel-side information from the wheel-side devices through the receiver antennas and extract air-pressure information representative of the detected air pressure, that is, detected-air-pressure information, and wherein the body-side device includes an estimating portion (54) which is operable, in the event of a failure of any of the receiver antennas to receive the wheel-side information, to estimate the tire air pressure on the basis of detected speeds of the wheel, and obtain estimated-air-pressure information representative of the estimated air pressure. Thus, the wheel-state obtaining apparatus is capable of obtaining information on the air pressure even in the event of a failure of the receiver antennas (20-26) to receive the wheel-side information.

The invention provides a fall alarm, a fall alarm detector and a fall alarm detecting method. The fall alarm comprises an MCU (microcontroller unit), a sensor unit, a GSM (global system for mobile communications) wireless unit, a display unit, a push-button unit, an alarm unit and a Bluetooth unit. The sensor unit, the GSM wireless unit, the display unit, the push-button unit, the alarm unit and the Bluetooth unit are connected with the MCU. The sensor unit comprises a 3D (three-dimensional) acceleration sensor for detecting the acceleration of a user and an air pressure sensor for detecting air pressure data. Through the data acquired by the 3D acceleration sensor and the air pressure sensor, the moving-down state, state of weightlessness and collision state of the body center of gravity of the user can be detected accurately, and misjudgement is less easy to occur. When the user is judged to fall down, the fall alarm operates timely, and accordingly injuries of unattended patients or old people can be reduced to the lowest level.

A navigation device and a method of calibrating the same are provided. The device includes a barometric pressure sensor and a GPS receiver. A processor calculates barometric and GPS derived altitudes and, based on a difference therebetween, corrects barometer altitude readings that would otherwise include drift errors. The processor uses a filter, such as a state feedback loop, to determine correction factors. The state feedback loop is adjustable to operate with different time constants. An error drift model is empirically determined and used to set the time constant. The time constant may be adjusted during operation based on a relation between the barometer correction quantity and an uncertainty in the vertical component of the GPS derived altitude. The method includes updating and recalibrating an atmospheric pressure model used to derive altitudes from the output of the barometric pressure sensor.

The invention provides a method for recognizing indoor and outdoor scenes. The method comprises the following steps: collecting data which are related to the current state of a mobile terminal and the scene, in which the mobile terminal is, through one or more of an optical sensor, an acceleration sensor, a gyroscope, a magnetic sensor, an air pressure sensor, a temperature sensor and/or a global positioning system component of the mobile terminal; and judging whether the current scene, in which the mobile terminal is, is indoor or outdoor on the basis of the collected data. According to the method, data collection and analysis and indoor and outdoor scene reorganization are carried out by using the sensor of a mobile phone instead of any prior information; and the method can be used as lightweight service capable of running on the background of the mobile phone, and has the characteristics of high accuracy rate, short detection time delay, low energy consumption and wide universality.

The invention relates to a portable SF6 gas resolvent photoacoustic spectrum detecting device and method which have the advantages of being high in sensitivity, capable of automatically achieving detection and concentration conversion, fast in detection speed, high in accuracy, easy to carry and suitable for online monitoring. A paraboloid column mirror is arranged in a casing, and an infrared source is arranged on the paraboloid column mirror. A chopper, an optical filter wheel and a photoacoustic cell are arranged in front of the paraboloid column mirror, and a plurality of optical filters are evenly distributed on the optical filter wheel along the circumferential direction. The photoacoustic cell comprises a microtone device, an air pressure sensor and a temperature sensor and connected with an air pipe and a vacuum pipeline which is connected with a vacuum pump. The chopper is connected with a chopper controller, the optical filter wheel is connected with a singlechip microcomputer, the microtone device is connected with a phase-locking amplification module, the air pressure sensor is connected with the singlechip microcomputer, the temperature sensor is connected with an analog/digital (A/D) converter which is connected with the phase-locking amplification module, and the singlechip microcomputer is further connected with a liquid crystal driving and display screen and a working power source.

The invention relates to an intelligent greenhouse shed system based on a cloud server. The intelligent greenhouse shed system comprises a greenhouse shed, an information collecting module, a plurality of functional modules, an automatic control system, a communication network and a solar power generating device; wherein the information collecting module comprises a temperature sensor, a humidity sensor, a photosensitive sensor, a gas pressure sensor and a soil fertilizer tester; each functional module comprises a temperature control module, a humidity control module, an intelligent light supplement module, a gas pressure adjusting module and a soil fertilizer supplying module; and the automatic control system comprises the cloud server. According to the intelligent greenhouse shed system, parameters of temperature, humidity, illumination, gas pressure, soil fertilizer and the like of the greenhouse shed can be intelligently adjusted, thereby enabling crops to be always in the best growing environment, so as to achieve the effects of high quality, high production and high yield; and meanwhile the utilization rate of resources is greatly improved; and the intelligent level is higher, the remote monitoring and control of greenhouse environment can be realized, the management convenience is improved, and the management cost is reduced. The intelligent greenhouse shed system has the advantages of energy saving, environment protection, high security, low running cost, wide application range, and convenience in popularization.

An ice maker comprising a refrigeration system, a water system, and a control system. The control system includes an air fitting disposed in the sump of the water system, a pneumatic tube, and a controller comprising a processor and an air pressure sensor. The air fitting defines a chamber in which air may be trapped and includes openings through which water in the sump is in fluid communication with the air in the chamber. The pneumatic tube is in fluid communication with the air pressure sensor and the air fitting. The air pressure sensor is adapted to sense a pressure corresponding to a sump water level. The controller is adapted to control the operation of the refrigeration system and the operation of the water system based upon the sump water level and to detect one or more failure modes of the water system based upon the sump water level.

The present invention relates to a mobile terminal capable of measuring an altitude and an altitude measurement method using the mobile terminal. The mobile terminal capable of measuring an altitude includes a barometric pressure information reception unit for receiving barometric pressure information, a barometric pressure correction unit for calculating a bias barometric pressure using the barometric pressure information received by the barometric pressure information reception unit, and a barometric pressure sensor for outputting a corrected barometric pressure to which the bias barometric pressure is applied.

A system for controlling boost pressure at various different altitudes of operation of a turbo charged internal combustion engine includes a wastegate valve, an actuator, and a controller. Signals delivered from an engine speed sensor, a boost pressure transducer, a barometric pressure sensor, and a turbocharger speed sensor are processed in the controller. A control signal delivered from the controller to the actuator controls the position of the wastegate valve, bypass of exhaust gasses, and the speed of the turbocharger. The controller is configured to compare the turbocharger speed to a predetermined threshold value and determine the control signal based on the comparison.

The invention discloses a dynamic identification system for automobile quality and the mass center position. Each automobile wheel is provided with a corresponding air spring, an airbag of the air spring is provided with an air pressure sensor which is used for measuring the pressure, an automobile speed sensor, an automobile body position sensor and an acceleration sensor are arranged nearby the mass center of an automobile body, an automobile door is provided with an automobile door opening/closing sensor, the air pressure sensor, the automobile speed sensor, the automobile body position sensor, the acceleration sensor and the automobile door opening/closing sensor are connected with a data processing unit through a data transmission device, and thus real-time quality of an automobile and the dynamic position of the mass center can be measured. The dynamic identification system for the automobile quality and the mass center position, disclosed by the invention, has the advantages that dynamic parameters can be provided for automobile control, and thus active control effects such as anti-roll control, braking control and starting acceleration control of an automobile can be obviously increased.

The invention discloses a fixed-wing automatic navigation flight control system and a using method thereof. The fixed-wing automatic navigation flight control system comprises an automatic navigation flight controller and ground station telemetry data monitoring software which are arranged on an aerocraft, wherein the automatic navigation flight controller comprises a central processing unit, a triaxial gyroscope, a triaxial acceleration sensor, a triaxial magnetic field sensor, a GPS (Global Positioning System) module, an air pressure sensor and a communication interface, the triaxial gyroscope, the triaxial acceleration sensor, the triaxial magnetic field sensor, the GPS (Global Positioning System) module, the air pressure sensor and the communication interface are respectively connected with the central processing unit, and a wireless receiving-transmitting device is mutually communicated with the central processing unit through the communicated interface; the ground station telemetry data monitoring software comprises a signal transfer plate, a data wireless transmission receiving-transmitting device, a remote controller receiver device and a USB transfer serial-port communication device, the data wireless transmission receiving-transmitting device, the remote controller receiver device and the USB transfer serial-port communication device are respectively connected with the signal transfer plate; the ground station telemetry data monitoring software is connected with the signal transfer plate through the USB transfer serial-port communication device; and the automatic navigation flight controller is communicated with the ground station telemetry data monitoring software through a wireless data transmission broadcasting station. The fixed-wing automatic navigation flight control system can accurately complete the preset flight mission and lengthen the control distance and range of a plane through a remote-control transfer control device, thereby ensuring high reliability and high stability of flight.

Systems, apparatus and methods for populating and using a pressure database to determine an altitude of a unit with an unknown altitude are presented. A pressure from one or more barometric pressure sensors linked to respective base stations are interpolated to determine a reference pressure (e.g., at sea level) at arbitrary coordinates (x,y) having pressure reading. For example, a mobile station at the arbitrary coordinates (x,y) records a pressure at the mobile station. A difference between this pressure at the mobile station and the interpolated reference pressure is determined, which may directly be interpreted as a defined altitude of the mobile station.

A pressure control system including an inflow unit for admitting pressurized air into a cabin, an outflow unit including a motor for operating a valve to discharge air from the cabin at a predetermined rate based on an motor control signal that sets the motor speed, a control unit, and an air pressure sensor within the cabin for determining a pressure signal. The control unit receives the pressure signal and computes a pressure rate of change error signal to set the motor control signal. The outflow unit, control unit, and air pressure sensor form a feedback control loop independent of motor speed, valve speed, or valve position feedback.

The invention discloses an intelligent fall monitoring device and a processing method thereof. The monitoring device comprises an alarm module, a signal collecting module and a signal processing module, wherein the signal collecting module comprises a three-axis acceleration sensor, an air pressure sensor and a pressure sensor which are respectively used for collecting real-time human body posture data, air pressure height data and pressure data; the signal processing module comprises a fall detecting unit, the fall detecting unit performs analysis and processing according to the collected real-time human body posture data, air pressure height data and pressure data so as to judge a human body fall state, and the fall detecting unit outputs a first signal to the alarm module when the fall detecting unit judges that a human body falls; the alarm module generates and outputs an alarm message according to the first signal. The intelligent fall monitoring device and the processing method thereof have the advantages that fall detection is performed by collecting three-axis acceleration, height and pressure data, the behavior features of the human body are considered effectively, and high accuracy is achieved.

A blow-by gas passage abnormality detecting system for an internal combustion engine detects, only under the condition that the running state of the engine is idle, a leakage of a blow-by gas coming from a blow-by gas passage for returning the blow-by gas produced in the engine to an intake passage, on the basis of a parameter varying with a change in the air flow to be sucked into the engine. The abnormality such as leakage or clogging in the blow-by gas passage is detected if the ISC opening of an idle speed control valve measured as a load amount at an idle time of the engine is smaller than a predetermined value. Alternatively, the abnormality may be detected by detecting the blow-by gas pressure in the blow-by gas passage downstream of a PCV valve by a gas pressure sensor.

The invention discloses a pipe fitting sealing property testing device and aims at achieving the effects that the pipe fitting sealing property testing device is convenient to operate, high in testing result accuracy and capable of guaranteeing that the two pipe ends of a pipe fitting are not prone to being damaged due to clamping. The device comprises an air feed pump, a baroceptor, a main rack, two push plate air cylinders, two side racks, a main end cover and a subsidiary end cover, the two push plate air cylinders are arranged on the two side racks respectively, a piston rod of one of the push plate air cylinders is connected with the main end cover, a piston rod of the other push plate air cylinder is connected with the subsidiary end cover, a main elastic sealing ring pad is arranged on the main end cover, a subsidiary elastic sealing ring plate is arranged on the subsidiary end cover, and a main cover air hole is formed in the main end cover. The pipe fitting sealing property testing device has the advantages that the pipe fitting can be positioned to the right position, the sealing property can be guaranteed, and the pipe fitting is not damaged due to clamping; the device is provided with a sealing structure which can be adjusted in a self-adaptation mode, and the sealing effect in the high pressure testing process can be intensified; the device is provided with an assistant positioning structure, the end covers can be prevented from moving backward, the push plate air cylinders can be protected, the sealing effect can be improved, and stability in the testing process can be maintained.

The invention discloses a battery thermal runaway trigger and released gas collecting device comprising a battery blast protective container body. A container cover on one end of the battery blast protective container body is equipped with an observation window and the other end of the battery blast protective container body is connected with a gas pressure control and acquisition system. The top of the battery blast protective container body is equipped with an anti-explosion pressure release apparatus. A battery thermal runaway trigger assembly, a battery surface temperature sensor, and an ambient temperature sensor are disposed in the battery blast protective container body. The battery surface temperature sensor is disposed on the battery thermal runaway trigger assembly. An air pressure sensor is disposed on the top of the battery blast protective container body. The battery thermal runaway trigger assembly comprises a fixing device and a tested battery sample on the fixing device. The battery thermal runaway trigger and released gas collecting device has a beneficial effect of satisfying a thermal runaway triggering and gas collecting function of batteries in different sizes.

The invention relates to a hill-start control device under traveling and parking braking and a using method thereof. In the invention, an air compressor is communicated with a hand braking reservoir and a feet braking reservoir through an air drier and a four-loop protective valve; the other end of the hand braking reservoir is communicated with a spring air chamber sequentially through a hand braking valve, a differential relay valve and a parking hill-start electromagnetic valve; the other end of the feet braking reservoir is communicated with the spring air chamber sequentially through a feet braking valve, an intermediate valve and a traveling hill-start electromagnetic valve; a parking air pressure sensor is arranged on an air path between the hand braking valve and the differential relay valve; a traveling air pressure sensor is arranged on an air path between the intermediate valve and the traveling hill-start electromagnetic valve; and the air pressure sensor and the hill-start electromagnetic valve are both connected with a whole electric control system circuit. The hill-start control device disclosed by the invention has the advantages of hill-start function under traveling and parking braking, stronger automaticity, higher sensitivity, strong controllability, wider application range and higher safety.

The invention relates to a test method for determining the unsaturated soil water characteristic parameters, which utilizes a test device to measure the soil water retention curve of soil body. The device mainly comprises a vertical displacement measuring meter 1, bolts 2, a pressurized shaft 3, a pressure chamber 12, a sample top cap 13, a fixed bolt 24 and a sample base 25. A second air pressure control valve 22 and a second water pressure control valve 19 are adjusted, and the sizes of the pore air pressure and pore water pressure in a sample are changed by a second air pressure sensor 23 and a second water pressure sensor 38, i.e. the size of matric suction s of the sample is changed; after the liquid level in a second volume water measuring tube 17 is stabilized, the change value of water quantity of inlet and outlet samples is read out to obtain a new water content of the sample w1 corresponding to matric suction s 1 so as to obtain a group of test data s1 and w1 on the soil water retention curve. The determination method has convenient use, high measuring precision, meets the requirements of three-dimensional stress, can measure the humidifying section and the dehumidifying section of the soil water characteristic curve, and is suitable for measuring the soil water retention curves of various soils in civil engineering.