A cable passage for sealing and for electrically contacting an exhaust-gas sensor includes: a protective sleeve; and at least one connecting cable which is run out of the protective sleeve on at least one front side of the protective sleeve. At least one cross section of the space existing between the protective sleeve and the at least one connecting cable is filled with a thermoplastically workable fluoropolymer-containing material.

Gas sensors are provided that are fashioned such that there is an increased flow over the sensor element. In this way, a good measurement dynamic is achieved even when these gas sensors are exposed to exhaust gases having a low flow speed.

A sensor assembly is provided for detecting a concentration of a fluid. The sensor assembly includes a sensing unit and a cover assembly. The sensing unit includes a transmitter configured to transmit a signal into a sensing volume and a receiver configured to receive the signal after the signal passes through a portion of the sensing volume. The cover assembly at least partially encloses the sensing volume and is substantially impermeable to a gas portion of the fluid. The cover assembly includes apertures defined therein which are permeable to the gas portion of the fluid. A first plurality of apertures are defined along a top surface of the cover assembly.

A device for determining a concentration of particles in a gas flow, e.g., soot particles in exhaust gas of an internal combustion engine, includes a carrier and a sensor, which is situated on a surface of the carrier and can be exposed to the gas flow, the sensor including an electrode structure including at least two measuring electrodes that are of different polarity and that are formed as an interdigital comb structure including finger electrodes. In first areas of the interdigital comb structure, the finger electrodes have a first mutual distance in relation to each other, and in second areas of the interdigital comb structure, the finger electrodes have a second smaller mutual distance in relation to each other, the first areas and the second areas in the interdigital comb structure each at least partially adjoining each other alternately, occupying respective surface areas on the sensor.

A signal processing apparatus for a gas sensor is applied to a gas sensor that is disposed on an exhaust passage of an engine to detect a concentration of a specific component in exhaust gas flowing through the exhaust passage. The signal processing apparatus includes a filtering means that attenuates exhaust pulsation noise included in a detection signal of the gas sensor, and a filter characteristic setting means that variably sets filter characteristics of the filtering means based on engine speed.

A particle detection system (1) includes a particle sensor (10) having a detection section (11) exposed to a gas under measurement EG. The particle sensor (10) includes an insulating member (121, 100), and a heater section (150, 105) for heating at least a portion of the gas contact surface (121s, 101s) of the insulating member (121, 100). The particle detection system (1) includes adhesive restraining energization means (225, 223, S4, S10) for heating the gas contact surface (121s, 101s) to an adhesion restraining temperature Td at which adhesion of the particles S to the gas contact surface (121s, 101s) is restrained as compared with the case where the heater section is not energized, wherein adhering particles SA which are particles adhering to the gas contact surface (121s, 101s) burn at the particle burning temperature Tb.

A control unit (6) estimates an output value of a PM sensor (S2) located at a downstream side of a DPF used as a reference filter, and detects whether the estimated output value exceeds a predetermined value (S3). When the estimated output value exceeds the predetermined value (YES in S3), the control unit detects an output value of the PM sensor (S4), and a heater heats the PM sensor (S5). The control unit detects an output value of the PM sensor (S6) after the PM sensor is heated, and calculates a change ratio of the output values of the PM sensor before and after heating (S7). The control unit estimates an average particle size of PM based on the calculated change ratio (S8), and detects whether the DPF has failed based on a comparison result of a corrected output value of the PM sensor with a threshold value.

A control device of an internal combustion engine is configured to perform a fuel cut-off control and an abnormality diagnosis control. A heating device for heating an element of an air-fuel ratio sensor is controlled by making an element temperature of the air-fuel ratio sensor become a target element temperature. The target element temperature of the air-fuel ratio sensor during a high temperature control period from a time when a prescribed high temperature control begins after a start of the internal combustion engine to a time when the prescribed high temperature control is completed after completion of the abnormality diagnosis control of the air-fuel ratio sensor is set to be higher than the target element temperature outside the high temperature control period.

An exhaust sensor module assembly has a sensor module and a shield. The shield is shaped to receive the module. The shield has a first mounting leg and a first flange extending from a first end of a base plate, and a second mounting leg and a second flange extending from a second end of the base plate. The shield is rotationally symmetric about an axis extending through and normal to the base plate.

This technology relates to the enlargement by water condensation in a laminar flow of airborne particles with diameters of the order of a few nanometers to hundreds of nanometers to form droplets with diameters of the order of several micrometers. The technology presents several advanced designs, including the use of double-stage condensers. It has application to measuring the number concentration of particles suspended in air or other gas, to collecting these particles, or to focusing these particles.