The present invention relates to a method for testing or verifying the indirect pressure monitoring system of the wheels (TW) of a vehicle (V).

Method for testing a temperature-compensated, pressure-gradient-controlled pressure switch, which is pneumatically associated with a primary pressure chamber and comprises a secondary pressure chamber for temperature compensation, wherein, by using at least one temperature-control apparatus between the primary pressure chamber and the secondary pressure chamber, a temperature gradient is set which is sufficiently great to produce a pressure gradient between the primary pressure chamber and the secondary pressure chamber that corresponds at least to the triggering pressure gradient of the pressure switch.

A multiple channel control system, pressure detection system, a method and a program are provided. A pressure detection system may include first and second pressure transducers having a common pressure source as an input. The first pressure transducer is a different type than the second pressure transducer. The system also includes a storage device configured to store a look up table having a calibrated relationship between temperature and pressure for the second pressure transducer. The system also includes a processor configured to periodically update the look up table based on pressure detected by the first pressure transducer when a condition is met.

In at least one embodiment, an apparatus for diagnosing a state of a capacitive sensor is provided. The apparatus comprises a measuring circuit for being electrically coupled to a capacitive sensor. The measuring circuit is configured to measure a first impedance of the capacitive sensor at a first frequency and to determine a first capacitance of the capacitive sensor at the first frequency based on the first impedance. The measuring circuit is further configured to compare the first capacitance of the capacitive sensor to a first threshold and to a second threshold to diagnose the capacitive sensor.

A sensor assembly includes a substrate having a first outer surface and a second outer surface opposite the first outer surface, a first die attached to the first outer surface and having a first diaphragm, a second die attached to the second outer surface and having a second diaphragm, and a full-bridge pressure sensor including a plurality of piezoresistive elements. A first subset of at least two of the plurality of piezoresistive elements is disposed on the first diaphragm and a second subset of at least two of the plurality of piezoresistive elements is disposed on the second diaphragm.

Disclosed are apparatuses and methods for detecting a failure of a torque sensor for a motor-driven power steering system, the apparatus including a processor configured to detect a failure in a first torque sensor and a second torque sensor based on main torque signals and sub-torque signals, compare a first torque value of the first torque sensor and a second torque value of the second torque sensor, in response to the first torque sensor and the second torque sensor being normal, measure an amount of change in first torque of the first torque sensor and an amount of change in second torque of the second torque sensor by applying electric current to a motor, in response to the comparison result being abnormal, and determine a failure in the first torque sensor and the second torque sensor based on the amount of change in first torque and second torque.

Aspects of the subject technology relate to electronic devices with pressure sensors. Pressure sensor occlusion may be detected based on a comparison of a variance of pressure data from the pressure sensor with a variance of acceleration data from an accelerometer of the device. If a ratio of the pressure data variance to the acceleration data variance is above a threshold, occlusion may be identified. Data from other sensors in the device or in an external device, or other features of the pressure data, may be used to identify a type of occlusion.

The present invention provides a refrigerator comprising: a cabinet having a storage chamber; a door for opening or closing the storage chamber; a case in which an inlet through which air flows from the storage chamber and an outlet through which the air is discharged to the storage chamber are formed; an evaporator provided inside the case for exchanging heat with the air to supply cool air; and a differential pressure sensor provided inside the case.

Certain implementations of the disclosed technology may include systems and methods for dynamic pressure testing of transducers in communication with a liquid. A method is provided that can include dynamically pressurizing a liquid in a cavity associated with a housing. While dynamically pressurizing the liquid, the method includes simultaneously measuring: a change in volume of the liquid; a test frequency response, by a test transducer in communication with the liquid; and a reference frequency response, by a reference transducer in communication with the liquid. The method may further determine a normalized frequency response of the test transducer, based at least in part on the test frequency response and the reference frequency response. The method may further provide an indication of the normalized frequency response of the test transducer and an indication of the bulk modulus of the liquid.

Methods are provided for identifying degradation in components of a compressor recirculation valve (CRV). One method includes differentiating between degradation of a throttle of the CRV and a position sensor of the CRV based on each of a throttle inlet pressure and commanded position of the throttle of the CRV. The method also includes utilizing output from the position sensor of the CRV in response to the commanded position of the throttle of the CRV.