Various embodiments include a method for checking a calibration of a pressure sensor comprising: moving a piston toward a TDC in successive cycles; while the piston moves toward TDC, closing an inlet valve thereby adjusting a setpoint value of a fluid pressure; measuring the fluid pressure with the pressure sensor arranged downstream of the outlet valve; applying a measurement current to the electromagnet when the inlet valve is closed; while the piston moves away from TDC, detecting an opening position of the inlet valve on the basis of a predetermined change with respect to time of the measurement current at which an opening movement of the inlet valve begins; over multiple pump cycles, changing the setpoint value of the fluid pressure by a predetermined difference; checking whether the change in opening position satisfies a predetermined correspondence criterion; and if the criterion is met, generating a fault signal.

Various embodiments include a method comprising: moving a piston toward TDC in successive pump cycles; during the movement, closing an inlet valve by applying current to an electromagnet; generating a pressure signal downstream of the outlet; applying a measurement current to the electromagnet when the inlet valve is closed; while the piston moves away from TDC, detecting an opening position at which an opening movement of the inlet valve begins on the basis of a predetermined change with respect to time of the measurement current; checking whether a value sequence of the ascertained opening positions over multiple pump cycles satisfies a predetermined discrepancy criterion with regard to the sensor signal; and if the discrepancy criterion is satisfied, generating a fault signal relating to the pressure sensor.

A diagnostic system of a vehicle includes an energy absorber sandwiched between a front bumper fascia and a front bumper reinforcement of the vehicle. A sensing tube is located between a portion of the energy absorber and the front bumper reinforcement. A first pressure sensor and a second pressure sensor measure a first pressure of air and a second pressure of air within the sensing tube, respectively. An actuator is configured to actuate and vary a pressure within the sensing tube. A diagnostic module is configured to selectively diagnose the presence of a fault with the sensing tube based on at least one of: a first change in the first pressure in response to actuation of the actuator; and a second change in the second pressure in response to the actuation of the actuator.

A notification sensor arrangement includes a drift pressure sensor measuring a drift signal indicative of a drift of a differential pressure sensor. The drift pressure sensor has a drift sensing unit formed on or in a symmetrical diaphragm, which has an upper side in fluid communication with a first fluid having a first pressure and a lower side in fluid communication with the first fluid having the first pressure. The notification sensor arrangement includes a comparing unit comparing the drift signal with a predefined threshold value to determine if the drift of the differential pressure sensor is a critical drift, a notification unit outputting a warning signal in response to a determination of the critical drift, and a base supporting the drift pressure sensor and the differential pressure sensor.

A capacitive sensor includes a first electrode structure; a second electrode structure that is counter to the first electrode structure, wherein the second electrode structure is movable relative to the first electrode structure and is capacitively coupled to the first electrode structure to form a capacitor having a capacitance that changes with a change in a distance between the first electrode structure and second electrode structure; a signal generator configured to apply an electrical signal at an input or at an output of the capacitor to induce a voltage transient response at the output of capacitor; and a diagnostic circuit configured to detect a fault in the capacitive sensor by measuring a time constant of the first voltage transient response and detecting the fault based on the time constant and based on whether the first electrical signal is the pull-in signal or the non-pull-in signal.

A sensor test system for a pressure sensor in an electronic parking brake (EPB) of a vehicle. The pressure sensor is configured to measure a pressure in a pressure chamber or in a pressure line of the EPB. The sensor test system includes a pressure setting module configured to set the pressure; and by a detection module configured to detect, based on pressure set by the pressure setting module and based on a measured pressure from the pressure sensor, a potential malfunction of the pressure sensor, and to issue a warning signal if the potential malfunction is detected.

A position sensor malfunction determination apparatus includes a determination unit and a controller. The determination unit is configured to perform a determination relating to electricity supply failure in a position sensor. The controller is configured to perform a fail-safe control. The determination unit is configured to determine whether each of conditions (A) and (B) is established, in a preliminarily determination before occurrence of the electricity supply failure in the position sensor is finally determined. The determination unit is configured to determine that the position sensor has a probability of the electricity supply failure when both the conditions (A) and (B) are determined to be established in the preliminarily determination. The controller is configured to execute, when the determination unit determines that the position sensor has the probability of the electricity supply failure, the fail-safe control before the occurrence of the electricity supply failure in the position sensor is finally determined.

A flood prevention system includes a first load, a second load, a third load, a fourth load, a first compressor, a first temperature sensor, a second temperature sensor, and a controller. The first, second, third, and fourth loads are configured to use a refrigerant to remove heat from a first, second, third, and fourth space, respectively, proximate to the first, second, third, and fourth load, respectively. The first compressor is configured to compress the refrigerant from the fourth load. The first temperature sensor is configured to detect a first temperature of the refrigerant from the first load, the second load, and the third load. The second temperature sensor is configured to detect a second temperature of the refrigerant from the first load, the second load, the third load, and the compressor. The controller is configured to trigger an alarm in response to certain conditions.

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.

An apparatus includes a sensor module, an offset diagnostic module, and a notification module. The sensor module is in operative communication with a cylinder pressure sensor and structured to acquire cylinder pressure data from the cylinder pressure sensor indicative of an actual in-cylinder pressure of a cylinder of an engine. The offset diagnostic module is structured to interpret the cylinder pressure data to determine an offset of the cylinder pressure sensor based on a reference in-cylinder pressure and the actual in-cylinder pressure. The notification module is structured to provide an offset error notification responsive to the offset being greater than a threshold offset.