To provide a controller and a control method for an internal combustion engine capable of estimating the cylinder internal pressure of the combustion cylinder accurately in consideration of the torsional vibration of the crankshaft. A controller for an internal combustion engine includes a torsional torque calculator that calculates a value which has an amplitude of the maximum value of torsional vibration torque calculated based on a crank angle acceleration in the combustion period, and vibrates with a preliminarily set natural angular frequency, as a torsional vibration torque in the combustion period; and a cylinder internal pressure estimator that calculates a combustion gas pressure torque, by use of the equation of motion of the rotation system of the crankshaft, based on the crank angle, the crank angle acceleration, and the torsional vibration torque, and estimates the cylinder internal pressure of the combustion cylinder based on the combustion gas pressure torque.

To provide a controller and a control method for an internal combustion engine capable of estimating the cylinder internal pressure of the combustion cylinder accurately in consideration of the torsional vibration of the crankshaft. A controller for an internal combustion engine includes a torsional torque calculator that calculates a value which has an amplitude of the maximum value of torsional vibration torque calculated based on a crank angle acceleration in the combustion period, and vibrates with a preliminarily set natural angular frequency, as a torsional vibration torque in the combustion period; and a cylinder internal pressure estimator that calculates a combustion gas pressure torque, by use of the equation of motion of the rotation system of the crankshaft, based on the crank angle, the crank angle acceleration, and the torsional vibration torque, and estimates the cylinder internal pressure of the combustion cylinder based on the combustion gas pressure torque.

In order to improve sensor characteristics and minimize variation in said characteristics, a pressure sensor is positioned upstream of a humidity sensor so as to help prevent water from contacting the humidity sensor and dust from adhering to the humidity sensor. This physical-quantity detection device 300 is characterized by having a detection unit 422 that detects humidity, a detection unit 421 that detects pressure, a circuit board 400 that has an electronic circuit that processes detection signals, and a housing 302 that accommodates the circuit board 400. The physical-quantity detection device 300 is also characterized in that the detection units 422, 421 are laid out on the surface of the circuit board 400 in a straight line in the direction in which a gas being measured flows, with the detection unit 421 that detects pressure positioned upstream of the detection unit 422 that detects humidity.

In order to improve sensor characteristics and minimize variation in said characteristics, a pressure sensor is positioned upstream of a humidity sensor so as to help prevent water from contacting the humidity sensor and dust from adhering to the humidity sensor. This physical-quantity detection device 300 is characterized by having a detection unit 422 that detects humidity, a detection unit 421 that detects pressure, a circuit board 400 that has an electronic circuit that processes detection signals, and a housing 302 that accommodates the circuit board 400. The physical-quantity detection device 300 is also characterized in that the detection units 422, 421 are laid out on the surface of the circuit board 400 in a straight line in the direction in which a gas being measured flows, with the detection unit 421 that detects pressure positioned upstream of the detection unit 422 that detects humidity.

Provided is a differential pressure sensor which includes: a housing including a body and a cover, the housing having a first chamber and a second chamber defined in the housing and separated from each other; a first pressure channel communicating with the first chamber; a second pressure channel communicating with the second chamber; and a substrate on which an electronic component is mounted and in which a terminal is formed, the substrate including a first surface facing the first chamber and a second surface extending parallel to the first surface and facing the second chamber, the substrate configured to cover the second chamber.

An internal combustion engine, as a drive engine for a vehicle, including an engine braking device having a throttle element which is associated with an exhaust gas section, for damming an exhaust gas which is emitted by a combustion device, and including a measuring device by means of which the exhaust gas pressure can be measured at a defined measuring region of the exhaust gas section upstream of the throttle element as seen in the exhaust gas flow direction. According to the disclosure, it is provided that at least one further measuring device is provided, by means of which the exhaust gas pressure can be measured at the defined measuring region, for realizing a redundant exhaust gas pressure measurement, and the measurement signals which are determined by means of the measuring devices can be transmitted to a controller for controlling the throttle element.

A pressure measuring rake, intended for arrangement on a link rod, includes at least: a sheath including two side walls which between them delimit a recess configured to receive the link rod, and an electronic circuit arranged on the sheath and including at least one sensor, the measuring rake additionally including at least one conductive layer at least partially covering the sheath and a conductive strip, the conductive layer and the conductive strip being configured to be electrically connected to at least one conductive element configured to drain off charges that are liable to build up on the conductive layer, the measuring rake making it possible to avoid the build-up of electrostatic charges liable to disrupt measurements taken by the sensors and/or electrical communications between the sensors and a data processing unit.

A measuring rake, configured to be arranged on a link rod, includes a sheath including a front face and two side walls delimiting between them a recess configured to receive the link rod, an electronic circuit arranged on the front face of the sheath and including at least one sensor, a patched leading edge fixed removably to the sheath, and a seal arranged between the patched leading edge and the electronic circuit, the patched leading edge including a plurality of air intakes, each forming a fluidic passage between an outer face and an inner face of the patched leading edge opening out facing at least one sensor of the electronic circuit, the measuring rake making it possible to obtain a measuring tool which can be assembled simply and quickly, with easy access to the electronic circuit, and making it possible to avoid problems of orifice blockages or air leaks.

A combination of a gas turbine pressure sensing assembly and an engine electronics unit. The pressure sensing assembly includes a pressure manifold having an air inlet and one or more air outlets. The pressure sensing assembly further includes one or more pressure sensors connected to the air outlets to sense the pressure of air entering through the air inlet. The engine electronics unit in operation produces waste heat. The pressure sensing assembly further includes a heat conduction path which thermally connects the engine electronics unit to the manifold such that the manifold acts as a sink for the waste heat. The temperature rise of the manifold produced by the waste heat preventing icing of the manifold.

A method or system to determine peak firing pressure of a cylinder of an engine having a crank shaft. The method includes accessing a knock signal received from a knock sensor of the cylinder. The method includes determining a location of peak firing pressure based at least in part on the knock signal. The location of peak firing pressure is associated with combustion of the engine and corresponds to a time or a crank angle of the crankshaft. The method includes generating an indication of the location of peak firing pressure.