An engine control unit (ECU) includes a housing; a cover sealingly engaged with the housing so as to define an interior space; a circuit board disposed in the interior space; and a fastener coupling together the circuit board, the housing and the cover, the fastener serving to limit an amount of deflection of the housing relative to the housing. The circuit board and the cover are constructed and arranged to define an airflow path from an outer surface of the cover to the interior space. The airflow path allows for a leak test to be performed on the ECU, wherein upon an affirmative determination that results of the leak test shows no leaks in the ECU, sealant seals the airflow path.

A sensors unit for an air compressor system, in a mutual module housing, includes: a pressure measuring unit for measuring a pressure; at least one further measuring unit for measuring another physical and/or chemical quantity; an evaluation and control unit configured to control the pressure measuring unit for measuring the pressure and the further measuring unit for measuring the other physical and/or chemical quantity as well as to provide measurement data; and an external interface for the output of the provided measurement data.

A fuel vapor treatment apparatus is provided with a fuel tank for storing fuel of an internal combustion engine, a canister for adsorbing fuel vapor generated in the fuel tank, a pump for reducing a pressure inside a detection target system including the fuel tank, a pressure detection sensor for detecting the pressure inside the detection target system, and a fluctuation detection unit for detecting a fluctuation width of the pressure inside the detection target system at the time when the pressure inside the detection target system is reduced to a predetermined pressure value.

An apparatus and a method for detecting leakage in a hydrogen tank of a hydrogen fuel cell vehicle are provided. Particularly, leakage is detected due to failure of an airtight seal of a solenoid valve in a hydrogen tank based on a change of the sensing value of a high pressure sensor which represents a hydrogen tank pressure during a process of performing a wakeup operation at the time of key-off of a vehicle.

An apparatus includes a temperature sensor, a pressure sensor, a communication interface, and a hardware controller. The hardware controller may detect a door open and close event for a refrigeration unit and receives temperature readings from the temperature sensor and pressure readings from the pressure sensor. The hardware controller determines whether a performance level of the seal has fallen below a threshold level based on the temperature and pressure readings and transmits a signal through the communication interface responsive to a determination that the performance level of the seal has fallen below the threshold level.

A method for diagnosing a purge control solenoid valve (PCSV) may include forming a negative pressure in a fuel tank, checking a pressure in the fuel tank and determining whether a target negative pressure is generated, when the target negative pressure is determined not to be formed based on a result of the determining whether the target negative pressure is generated, suspecting a stuck of the PCSV that electrically controls an inflow amount of evaporated gas from the fuel tank to an intake system of an engine, and increasing a purge amount of the PCSV.

The invention relates to a method for checking the functional capability of the thermal insulation of a transport container, at least one vacuum insulation panel being installed in the thermal insulation of the transport container, which vacuum insulation panel consists of a porous core material of low thermal conductivity and a gas-tight casing, which surrounds the core material in a tightly contacting manner at very low internal pressure, and which vacuum insulation panel has a pressure sensor and a transponder connected to the pressure sensor within the casing, the transponder being controlled for checking by means of an external reading device from outside the thermal insulation and the response signal of the transponder being captured (read out) and the response signal being evaluated with respect to whether the internal pressure in the vacuum insulation panel is correctly low or incorrectly high. Said method is characterized in that the external reading device can be moved and, while the transport container stands still or is moved in a controlled manner, the external reading device is moved to a specified position relative to the transport container in an automated, motorized manner, said position being suitable for reading out the transponder, that the response signal of the transponder is captured there and that the captured response signal of the transponder is electronically evaluated in an automated manner.

A leakage detection device for detecting leakage in a positive crankcase ventilation (PCV) passage having at least a scavenging line and a fresh air line includes: a first pressure measurement unit that measures a pressure in the PCV passage; a leakage detection valve that opens and closes the fresh air line; a PCV valve that adjusts a flow rate of blow-by gas; a second pressure measurement unit that measures a pressure in the intake passage; a first valve controller that controls the leakage detection valve when a leakage diagnostic condition is satisfied; a second valve control unit that reduces an opening degree of the PCV valve, and suppresses a flow rate in the PCV passage based on the pressure in the intake manifold after the leakage detection valve is closed; and a leakage determination unit that determines whether leakage occurs based on the pressure in the PCV passage.

A leak test apparatus including a sleeve member having a first end and a second end and being configured to surround a portion of a transmission medium, a first retaining device configured to couple the first end of the sleeve member to a boundary fitting to which the transmission medium is coupled, and where the sleeve member is configured to contain a leak detection medium and effect a pressurization of the boundary fitting with the leak detection medium.

A method and system for testing airtightness of a building envelope (10). An air flow generator (21) is provided that is switchable between at least two different flow rates (Q0,Q1). The air flow generator (21) is repeatedly switched between a first flow rate (Q0) and a second flow rate (Q1) for modulating the building pressure (P1) as a function of time (t) between respective equilibrium pressure values at the first flow rate (Q0) and the second flow rate (Q1). The relative building pressure (P) is measured by a differential pressure transducer (31) and recorded as a function of time (t). A pressure modulation amplitude (Pmodulation) is calculated for providing a measure of the airtightness.