Calibration of a valve in a vacuum system and providing a diagnostic indication in the vacuum system using the calibration includes measuring conductance of the valve as a function of angular valve position and generating a conductance calibration map or function for use during operation of the valve. An actual angular valve position is set based on the received set point angular valve position and a difference between the measured valve conductance and a predefined metric of conductance versus angular valve position. An actual system conductance and a difference between the actual system conductance and a reference system conductance for the system are determined. The diagnostic indication of a fault in the system is generated based on the actual angular valve position of the valve and the difference between the actual system conductance and the reference system conductance for the system.

A testing device for general aviation carburetors and fuel servos. The testing device is capable of replicating carburetor operating characteristics operation under both naturally aspirated conditions and turbo charged compressed air conditions using sensors to monitor and record the operating characteristics of both horizontal and vertical type carburetors, and compare the data received with predefined values. The testing device measures both test fluid and air flow through a carburetor. A moveable camera is placed within the throttle body of the carburetor being tested providing visual inspection of the fluid atomization with snap shot capability. The testing device also includes flow sensors to record the performance of the carburetor, providing automated data collection with memory storage. The device is fully portable with lockable caster wheels.

Techniques are described for determining an amount of fuel that is consumed by the body components of a vehicle, based at least partly on sensor data describing the operations of the body components and/or the location of the vehicle. A vehicle is equipped with a body that has any suitable number of body components that perform operations not directly associated with the translational movement of the vehicle from one location to another. Fuel is consumed to provide power (e.g., through power take off) to operate the body components. The vehicle includes sensor device(s) configured to sense the operations of the body components and generate sensor data that describes the operations of the body components. The sensor data is analyzed to determine an amount of fuel that is consumed to power the operations of the body components.

A method for cementing a borehole includes pumping a collection of fluids into the borehole through a tubular string in the borehole and flowing the collection of fluids up an annulus positioned between the tubular string and a sidewall of the borehole. The method additionally includes monitoring a volume of the fluids pumped into the borehole, and performing a first estimation of a position of the fluids based on the volume of the collection of fluids pumped into the borehole, and an initial estimate of an average diameter of the sidewall of at least a portion of the borehole. The method further includes calculating a corrected estimate of the average diameter based on the first estimation and a pressure of the fluids measured at an inlet of the tubular string, and performing a second estimation of the position of the fluids based on the corrected estimate of the average diameter.

The present disclosure provides a method for intelligent metering of natural gas, including obtaining a metering value of the natural gas used by a user in a time period from a metering device via a network, the metering device being located at a gas supply terminal of a transmission pipe network, and determining a consumption amount of natural gas based on the metering value and a pricing scheme. The pricing scheme includes a volume-based pricing scheme and an energy-based pricing scheme. Volume unit prices of the natural gas in different component types are different, and are determined based on an adjustment model.

The present disclosure provides a method for intelligent metering of natural gas, including obtaining a metering value of the natural gas used by a user in a time period from a metering device via a network, the metering device being located at a gas supply terminal of a transmission pipe network, and determining a consumption amount of natural gas based on the metering value and a pricing scheme. The pricing scheme includes a volume-based pricing scheme and an energy-based pricing scheme. Volume unit prices of the natural gas in different component types are different, and are determined based on an adjustment model.

A system includes a concentration sensor, a flow sensor, and a controller. The concentration sensor is configured to measure a concentration of a contaminant in a cabin of an aircraft. The flow sensor is configured to measure a flow rate of air into the cabin. The controller is configured to determine whether a concentration measurement of the contaminant in the cabin exceeds a first concentration threshold. The controller is configured to, in response to determining that the concentration measurement does not exceed the first concentration threshold, control the flow rate of air into the cabin based on a flow rate setpoint. The controller is configured to, in response to determining that the concentration measurement exceeds the first concentration threshold, control the flow rate of air into the cabin based on a flow rate setpoint and a correction factor that is based on a flow sensor tolerance.

A system and method for determining a fluid consumption rate from a fluid tank is described. The fluid tank includes a fuel for an internal combustion engine and the internal combustion engine provides power to a powered system. The method includes determining instantaneous fluid consumption; determining an operating condition of the powered system, the powered system providing a load on the internal combustion engine; determining the load on the internal combustion engine and a state of the internal combustion engine; and calculating the fluid consumption rate based on the instantaneous fuel consumption, the load on the internal combustion engine, and the state of the internal combustion engine.

A system and method are provided for estimating a fluid level in a reservoir disposed in a vehicle compartment having a compartment cover. The method includes monitoring at least one operational parameter relating to the reservoir, monitoring a state of the compartment cover using a sensing device, detecting a triggering event based on the at least one operational parameter, the state of the compartment cover, or both, and in response to the triggering event, determining an estimate for an amount of fluid in the reservoir based on data related to the triggering event, and initiating a notification to a vehicle occupant when the estimated amount of fluid in the reservoir is less than or equal to a low level threshold.

A method includes receiving, by a processor of a dialysis machine, a dialysate flow rate, a bicarbonate setting value, a signal from a pressure sensor configured to measure a pressure within a container, and a signal indicating a state of a fill valve; determining, based on the signal received from the pressure sensor and the state of the fill valve, fill parameters; determining a volume of the container based on at least two of the fill parameters; determining a depletion time in which the concentrate will be depleted from the container based on the volume of the container, the dialysate flow rate, and the bicarbonate setting value; determining, based on the depletion time, an amount of time remaining before the concentrate will be depleted from the container; and causing the dialysis machine to indicate the amount of time remaining before the concentrate will be depleted from the container.