Abstract: A semiconductor pressure sensor includes: a first semiconductor substrate; an insulating film provided on the first semiconductor substrate and including a main opening, an introduction opening, and a connection opening which connects the main opening and the introduction opening; a second semiconductor substrate bonded to the first semiconductor substrate with the insulating film interposed therebetween and including a diaphragm provided above the main opening and a receiving pressure inlet connected to the introduction opening; and a gauge resistor provided on the diaphragm and converting a deformation amount of the diaphragm into change in electrical characteristics.

Abstract: A pressure sensor which detects a combustion pressure of an engine includes: a contact part which is in direct or indirect contact with a casing of the engine when the pressure sensor is attached to the engine; and a pressure detection unit which detects the combustion pressure and outputs a signal corresponding to the combustion pressure, wherein the pressure detection unit includes a pressure detection element which detects the combustion pressure and outputs a signal, and a circuit unit which converts the signal obtained from the pressure detection element into a signal corresponding to the combustion pressure, and the pressure detection unit is provided at a location positioned more inside the engine than the contact part when the pressure sensor is attached to the engine.

Abstract: A pressure detection device includes: a piezoelectric element that detects a pressure change via a diaphragm head or the like; a circuit board that is provided with a processing circuit that performs electrical processing with respect to a charge signal outputted from the piezoelectric element; a conductive housing member, which has conductivity and is disposed to cover (house) the circuit board, and which is connected to the ground of the circuit board; and a housing (a leading end side housing, the diaphragm head and a rear end side housing), which houses the piezoelectric element, the circuit board and the housing member, and which is electrically insulated from the piezoelectric element, the circuit board and the housing member.

Abstract: A method of testing sensors includes providing a test sheet that includes a plurality of sensor assemblies, a plurality of test pads, and traces extending from the sensor assemblies to the plurality of test pads. A sensor is positioned on each sensor assembly. Each sensor is connected to the sensor assembly with wire bonds. An enclosure is formed over the plurality of sensor assemblies. An electrical signal is detected from each of the plurality of sensor assemblies at the test pads.

Abstract: A strain sensor is provided which includes a strain sensor, a first housing, a second housing joined to the first housing, and a pressure measuring mechanism firmly retained between the first housing and the second housing. The pressure measuring mechanism is gripped between a first face of the first housing and a second face of the second housing to measure compressive stress exerted by a cylinder head of an internal combustion engine on the first housing and the second housing. This structure improves the reliability of mechanical strength of the housings and the pressure measuring mechanism and provides flexibility in selecting the type of the pressure measuring mechanism.

Abstract: A heat shield film is formed on a bottom surface of a cylinder head and a heat shield film is formed on an inner peripheral surface of a small diameter hole portion. The film is a thermal spraying film made from the same film material. Since the film is thicker than the film, the film has higher thermal capacity than the film and thus heat retaining effect of the film is higher than that of the film. Therefore, combustion gas generated in a combustion chamber is suppressed to lose its momentum around the portion. Even if the combustion gas goes off around the portion, excessive temperature decrease of the combustion gas in the portion is suppressed.

Abstract: Methods and systems for estimating the loading of an air filter are disclosed herein. The method includes receiving upstream mass air flow data indicative of a mass air flow on an upstream side of an air filter (i.e., the “dirty side of the filter”), receiving downstream air pressure data indicative of an air pressure on a downstream side of the air filter (i.e., the “clean side of the filter”), and receiving downstream temperature data indicative of a temperature on the downstream side of the air filter. The method also includes determining a differential pressure (?P) across the air filter indicative of a loading of the air filter based on the upstream mass air flow data, the downstream air pressure data, and the downstream temperature data.

Abstract: The flow channel unit includes: a pair of end flow channels disposed at an inflow port and an outflow port, respectively, and extending along in flow direction; a center flow channel including a pressure receiving portion having a thin film shape and disposed at a position sandwiched between the pair of end flow channels, a distance from an inner peripheral surface of the pressure receiving portion to an outer peripheral surface thereof being shorter than a distance from an inner peripheral surface of the pair of end flow channels to an outer peripheral surface thereof. The pair of end flow channels and the center flow channel are integrally formed of a flexible resin material, and the pressure detection portion is disposed such that the pressure of the fluid circulated through a flow channel is transmitted via the pressure receiving portion.

Abstract: Provided is a pressure detection device including: a pressure detection unit; and a flow channel unit provided with a flow channel and a pressure receiving portion. The pressure detection unit includes a pressure sensor including a diaphragm, and a pressure transmission portion which is disposed in a state where one end of the pressure transmission portion is in contact with the diaphragm and the other end thereof is in contact with the diaphragm, and transmits a pressure of a fluid received by the diaphragm to the diaphragm. The pressure transmission portion is disposed in a state where the diaphragm is displaced toward the flow channel and an urging force directed from the diaphragm to the diaphragm is received.

Abstract: A combustion pressure detection device for detecting combustion pressure inside a combustion chamber of an internal combustion engine, the combustion pressure detection device being attachable to a communication hole communicating an inside of a cylinder head configuring the combustion chamber and an outside thereof, the combustion pressure detection device includes: a housing; and an piezoelectric element and the like that are located in the housing and detect the combustion pressure. The housing has an attachment structural part attachable to the communication hole, the attachment structural part has a third outer peripheral surface to which a first seal member is attachable, and a inclined surface to which a second seal member is attachable, and the inclined surface is arranged at a front end side in a direction to the combustion chamber relative to the third outer peripheral surface when the combustion pressure detection device is attached to the communication hole.

Abstract: A controller for an internal combustion engine includes a combustion pressure sensor and a temperature calculator. The combustion pressure sensor has a pressure receiver, a semiconductor device, and a detection circuit. The pressure receiver is arranged in a combustion chamber. The internal pressure applied to the pressure receiver is transmitted to the semiconductor device, and the resistance value of the semiconductor device is changed in accordance with own temperature and own deformation caused by the internal pressure. The detection circuit outputs power in accordance with the pressure applied to the pressure receiver and the temperature of the semiconductor device. The temperature calculator calculates a temperature of the combustion chamber based on an output of the detection circuit at the time when a combustion pressure is not acting on the pressure receiver.

Abstract: A glow plug includes a cylindrical housing, a rod-shaped heater, a membrane portion, and a pressure sensor. The cylindrical housing extends along an axial direction. The rod-shaped heater extending along the axial direction is displaced along the axial direction and has one end portion disposed within the housing, and an other end portion which is exposed from the housing. The membrane portion connects together the heater and the housing and has a multi-layer construction which has a first layer and a second layer of which at least part is positioned nearer to the other end portion in the axial direction of the heater than the first layer. The pressure sensor measures a pressure within a combustion chamber in which the other end portion is disposed by making use of a displacement of the heater. A thickness of the second layer is larger than a thickness of the first layer.

Abstract: A pressure-measuring glow plug has a heating pin for igniting a combustion mixture of an internal combustion engine and a pressure sensor for detecting a combustion chamber pressure of the internal combustion engine. The pressure-measuring glow plug has a contacting unit which includes a carrier for accommodating a signal processing unit and a plug connection having connecting contacts in a plug housing. A glow module housing for accommodating the heating pin and the pressure sensor and an electronic module housing for accommodating the carrier are provided. The electronic module housing is connected at a glow module-sided connecting location to the glow module housing and, at a plug-sided connecting location, to the plug housing.

Abstract: A pressure indicator, which can be detachably connected to an air compressor for measuring the pressure of compressed air produced in the air compressor, includes a tube and a slider. The slider can be moved along a first bore and a second bore of the tube. The motion of the slider in the tube is similar to the motion of a piston body in a cylinder. The tube is provided with a tapered annular surface, between the first bore and the second bore, and defines an elongated opening. In addition, when the pressure of the compressed air exceeds a predetermined pressure, excessive air can be released into the ambient environment, without using a mechanical safety valve, so that an object can be prevented from over-inflation.

Abstract: A jointless pressure sensor port which includes a body portion, a flange portion integrally formed with the body portion, and a cylindrical portion integrally formed with and extending away from the flange portion. The port also includes an aperture having a first area, where the aperture is formed as part of the cylindrical portion. A channel is located along an axis and has at least one channel region. The channel at least partially extends through the cylindrical portion, the flange portion, and the body portion. A diaphragm includes a second area which is larger than the first area, the diaphragm also has a top surface and a bottom surface. A pressure sensor is disposed on the top surface, and the diaphragm is substantially perpendicular to the axis of the channel. The body portion, flange portion, and cylindrical portion form a jointless and seamless pressure sensor part.

Abstract: A coupling member (180) of a glow plug (100) includes a first bend (183) and a second bend (184) folded in an axis direction OD and a joint section (185) in a tapered shape configured to connect the first bend with the second bend and reduce the diameter toward a rear end side of a body portion. Accordingly, in a limited space formed between a housing (130) and a heater unit (150), this configuration increases the length of the coupling member (180), compared with a configuration without any bend folded in the axis direction OD. This results in decreasing the spring constant k of the coupling member 180 and suppressing extension of the coupling member 180 in the axis direction due to thermal expansion.

Abstract: Described is an elastic diaphragm for a pressure-measuring device for ascertaining a pressure in a combustion chamber of an internal combustion engine, especially a self-ignitable internal combustion engine, the diaphragm being accommodated in a housing of the pressure-measuring device in order to separate a pressure chamber from a cavity and in order to seal the housing from the pressure to be measured. The diaphragm has a pressure-application region. Furthermore, the diaphragm is developed in the shape of a ring and in cross-section has a U-shape that is open toward the cavity; the region of the diaphragm on which the pressure is acting is geometrically made up of two interconnected quarter circles, so that the pressurized region has a structure that is self-supporting with respect to the arising combustion pressure loads.

Abstract: A combustion pressure detection device for detecting combustion pressure inside a combustion chamber of an internal combustion engine, the combustion pressure detection device being attachable to a communication hole communicating an inside of a cylinder head configuring the combustion chamber and an outside thereof, the combustion pressure detection device includes: a housing; and an piezoelectric element and the like that are located in the housing and detect the combustion pressure. The housing has an attachment structural part attachable to the communication hole, the attachment structural part has a third outer peripheral surface to which a first seal member is attachable, and a inclined surface to which a second seal member is attachable, and the inclined surface is arranged at a front end side in a direction to the combustion chamber relative to the third outer peripheral surface when the combustion pressure detection device is attached to the communication hole.

Abstract: A combustion pressure sensor having a tubular housing extending in an axial direction DX, a displacement member disposed within the housing, and a tubular connection member which elastically connects the displacement member to the housing. The combustion pressure sensor has a housing weld W1 that connects the housing and the connection member At least a circumferential portion of the housing weld is a bulge housing weld RW1 which bulges in a radial direction DR.

Abstract: A device for sensing a pressure, particularly in a combustion chamber of an internal combustion engine. The device has a housing and an adapter element, secured in the housing, for accommodating a sensor module. The sensor module includes a transmission element, a sensor element and a supporting element, the sensor module being supported by way of the transmission element on a compensation member which is joined to the adapter element, and by way of the supporting element on a fixing element. At an end face pointing toward the sensor module, the compensation member is provided with a circular recess, in which the transmission element is accommodated in centered fashion.

Abstract: The invention relates to a pressure gauge for measuring the pressure in a combustion chamber of an engine, comprising a housing, a tappet, which is movable in the housing in an axial direction under the action of combustion chamber pressure, a sensor for detecting an axial displacement of the tappet, and a force transmitter, in order to transmit a force loading the tappet to the sensor. In accordance with the invention, the force transmitter has at least one damping section for damping flexural vibrations, at which its flexural rigidity is reduced.

Abstract: A force sensor can include a magnetic field generator, a magnetic flux return, and a magneto-elastic layer. The magnetic flux return can extend along a first portion of at least one pathway of magnetic flux generated by the magnetic field generator. The magneto-elastic layer can be operable to be in contact with a surface subjected to force and thereby strained. The magneto-elastic layer can extend along a second portion of the at least one pathway of magnetic flux distinct from the first portion.

Abstract: One or more techniques and/or systems are disclosed for generating a linearized pressure sensor pattern for a pressure sensor. Force may be applied to a pressure sensor sample, comprising the pressure sensor without conductors. A patch, comprising an area of contact between a top and bottom surface of the sensor sample, can be measured, which corresponds to the applied force. Patch measurements can be made for respective applied force intervals, resulting in one or more indications of applied force, respectively corresponding to an indication of a patch measurement. The linearized pressure sensor pattern can be generated using the one or more force indications and corresponding patch measurement indications.

Abstract: The invention relates to a pressure-measuring plug for a combustion engine comprising a plug body with a body tip section facing in use the combustion chamber and comprising a passage, a ring-shaped sensing structure comprising an outer section, an inner section and an annular diaphragm, the plug body being attached to the outer section, a circular membrane comprising an outer part coupled to the outer section and an inner part coupled to the inner section, the membrane provides a sealing protecting the annular diaphragm against the harsh environment in a combustion chamber; and, a plug chamber formed by the circular membrane and the body tip section wherein the passage of the body tip section provides an open connection between the plug chamber and the combustion chamber. The passage is part of a channel structure which functions as a soot filter.

Abstract: A combustion chamber pressure gauge for an internal combustion engine, comprising a housing tube, a plunger, which is movable in an axial direction in the housing tube under the effect of combustion chamber pressure against a restoring force, and comprising a seal, which is disposed between the plunger and the housing tube, and comprising a sensor for detecting an axial displacement of the plunger. The sensor is decoupled from thermally induced expansions or contractions of the housing tube, in that the sensor is attached to a carrier, which is suspended in the housing tube, and the plunger is movable relative to the carrier under the effect of combustion chamber pressure.

Abstract: A pressure-measuring device for recording a pressure in a combustion chamber of an internal combustion engine, having a force transmission body, situated in a housing, which is exposed to the combustion chamber and which transmits the combustion chamber pressure to a pressure-measuring unit at least indirectly by an axial motion, and having a flexible diaphragm, which is situated between the force transmission body and the housing. The flexible diaphragm is configured to be resilient to implement the axial motion of the force transmission body within the housing. A flexible additional diaphragm is connected ahead of the flexible diaphragm on the combustion chamber side, which seals the flexible diaphragm from the combustion chamber.

Abstract: A glow plug in which a convex portion (70) is formed in an outer peripheral surface (10b) of a heater (10) in a part facing an inner peripheral surface (137b) of a leading end part (137) of a housing (110) and interposed in a leading end side annular gap K1, so as to maintain a gap with the inner peripheral surface (137b). A decline in detection accuracy can be prevented to the extent that combustion gas can be received by the leading end (72) of the convex portion (70) even if soot clogging should occur.

Abstract: A cylinder internal-pressure sensor is provided with a housing unit 2 composed of an outer cylinder portion 2e and an inner cylinder portion 2i having elastic portions 2es and 2is having elasticity in an axial direction Fs formed on an intermediate portion Xm in the axial direction Fs; a pressure-receiving ring block portion 3 hermetically fixed between the outer cylinder portion 2e and the inner cylinder portion 2i located on the fronts of the elastic portions 2es and 2is and faced with the rear of the elastic portions 2e and 2i through the elastic portions 2e and 2i and having a front surface 3f as a pressure receiving surface; at least one or more pressure detection elements 5a, 5b, 5c, . . .

Abstract: Disclosed is a pressure-measuring plug (100) for a combustion engine comprising a hollow plug body (102), a housing (110) attached to a distal end (102D) of the plug body (102), electronic components (116) arranged in the housing (110) and a sensing module (104) arranged in the hollow plug body and attached to a proximal end (102P) of the hollow plug body (102) The measuring plug further comprises an interconnection module (108) configured to electrically connect the electronic components (116) to the sensing module (104) through the hollow plug body. The interconnection module (108) comprises an elongated support structure (108A) with a first end (108P) provided with first terminals (108C) and a second end (108D) provided with second terminals (108B1), wherein the first terminals (108C) provide an electrical coupling which is flexible in axial direction. The interconnection module provides a reliable connection and could be used for mass production.

Abstract: A seal member (60) has a dual-tube structure consisting of an outer tubular seal member (160a) and an inner tubular seal member (160b); the outer tubular seal member (160a) is welded, at its rear end portion, to the inner circumferential surface of a forward-end housing (131), thereby forming a housing-side joint W2; the inner tubular seal member (160b) is welded, at its forward end portion, to a forward end portion of the outer tubular seal member (160a), thereby forming an inter-tubular-seal-member joint W3; and the inner tubular seal member (160b) is welded, at its portion located rearward of the joint W3, to the outer circumferential surface of the heater (10), thereby forming a heater-side joint W1. An action of pressing the heater forward is effected on the basis of an axial dimension L1 between the joints W2 and W1 shorter than an axial dimension between the joints W2 and W3 and is, therefore, mitigated.

Abstract: A pressure sensor has a sensor body at least partly formed with an electrically insulating material, particularly a ceramic material, defining a cavity facing on which is a diaphragm provided with an electric detector element, configured for detecting a bending of the diaphragm. The sensor body supports a circuit arrangement, including, a plurality of circuit components, among which is an integrated circuit, for treating a signal generated by the detection element. The circuit arrangement includes tracks made of electrically conductive material directly deposited on a surface of the sensor body made of electrically insulating material. The integrated circuit is made up of a die made of semiconductor material directly bonded onto the surface of the sensor body and the die is connected to respective tracks by means of wire bonding, i.e. by means of thin connecting wires made of electrically conductive material.

Abstract: An apparatus for measuring temperature comprises a housing and an actuator pressure sealed to the housing and having a shaft. The actuator is configured to be in pressure communication with a volume of gas or liquid. Upon a change in pressure, the actuator is displaced at least partially in the axial direction. A sensor detects axial displacement of a magnetically encoded target upon the change in pressure in the volume. A device for measuring pressure and temperature in an engine cylinder comprises a valve in pressure communication with an engine cylinder. The valve stem has a magnetic coding located adjacent a sensor. Axial displacement of the stem under cylinder pressure and temperature changes are detected.

Abstract: A combustion chamber pressure sensor is provided for recording a pressure in a combustion chamber of an internal combustion engine, the combustion chamber pressure sensor has a housing having an inner space that is at least partially enclosed by the housing. At least one mechanical-electrical transducer element, for recording the pressure, is accommodated in the housing. The housing has at least one housing opening. The housing opening is sealed by at least one diaphragm. The diaphragm has at least one convex curvature towards the inner space.

Abstract: A pressure measuring device includes a housing and a rod which is movable in the axial direction in the housing under the effect of combustion chamber pressure where the rod protrudes from the housing. A sensor measure combustion chamber pressure acting on the rod, and a first diaphragm is attached to the housing through which the rod extends. A second diaphragm is attached to the housing through with the rod extends between the sensor and the first diaphragm. The second diaphragm generates a return force when the rod undergoes axial displacement caused by pressure on the rod.

Abstract: The present invention disclosed provides for a rugged, compact sensing device for various implementations including those of automotive, marine, and other combustion technologies that require low cost accurate pressure sensing during internal combustion engine process. In one or more aspects of the present invention, a MEMS sensor connection with a flexible circuit is presented and the communication of which is preferably achieved through the use of wire bond technology.

Abstract: A combustion chamber pressure gauge for an internal combustion engine, comprising a housing tube, a plunger, which is movable in an axial direction in the housing tube under the effect of combustion chamber pressure against a restoring force, and comprising a seal, which is disposed between the plunger and the housing tube, and comprising a sensor for detecting an axial displacement of the plunger. The sensor is decoupled from thermally induced expansions or contractions of the housing tube, in that the sensor is attached to a carrier, which is suspended in the housing tube, and the plunger is movable relative to the carrier under the effect of combustion chamber pressure.

Abstract: An arrangement and method for providing compensation to a cyclical input signal is disclosed. The arrangement comprises a first detection unit (20) for detecting a first event in a cyclical output signal; a compensation signal generation unit (14) for generating a compensation signal; and a signal combination unit (8) for combining the compensation signal and the cyclical input signal to obtain the cyclical output signal. The compensation signal generation unit (14) is arranged to adjust the compensation signal at an instant which has a determined relationship with the detection of the first event. By adjusting the compensation signal at the right instant in a cycle of the cyclical output signal, the adjustment will not influence the further processing of the cyclical output signal. The method can be used to compensate the offset and sensitivity characteristics of a sensor.

Abstract: The invention relates to a pressure-measuring plug for a combustion engine comprising a plug body with a body tip section facing in use the combustion chamber and comprising a passage, a ring-shaped sensing structure comprising an outer section, an inner section and an annular diaphragm, the plug body being attached to the outer section, a circular membrane comprising an outer part coupled to the outer section and an inner part coupled to the inner section, the membrane provides a sealing protecting the annular diaphragm against the harsh environment in a combustion chamber; and, a plug chamber formed by the circular membrane and the body tip section wherein the passage of the body tip section provides an open connection between the plug chamber and the combustion chamber. The passage is part of a channel structure which functions as a soot filter.

Abstract: The invention relates to a pressure gauge for measuring the pressure in a combustion chamber of an engine, comprising a housing, a tappet, which is movable in the housing in an axial direction under the action of combustion chamber pressure, a sensor for detecting an axial displacement of the tappet, and a force transmitter, in order to transmit a force loading the tappet to the sensor. In accordance with the invention, the force transmitter has at least one damping section for damping flexural vibrations, at which its flexural rigidity is reduced.

Abstract: A device for sensing a pressure, particularly in a combustion chamber of an internal combustion engine. The device has a housing and an adapter element, secured in the housing, for accommodating a sensor module. The sensor module includes a transmission element, a sensor element and a supporting element, the sensor module being supported by way of the transmission element on a compensation member which is joined to the adapter element, and by way of the supporting element on a fixing element. At an end face pointing toward the sensor module, the compensation member is provided with a circular recess, in which the transmission element is accommodated in centered fashion.

Abstract: This heater plug includes: A tubular body (2), A finger (4) mounted inside the tubular body (2) and protruding outside the body at one extremity of this body, and A pressure sensor (8), A membrane (28) extending between the body (2) and the finger (4) enabling a relative longitudinal movement between the finger (4) and the body (2). The pressure sensor (8) is arranged between firstly a first bearing part (38) connected via a first tubular part (20, 20?) to the finger (4) in the vicinity of the membrane (28) and a second bearing part (40) connected via a second tubular part (22) to the body (2).

Abstract: A combustion pressure sensor (1) includes a housing (2) having an axial hole (23), a flexible member (8) fixed at one end to the housing (2) and being displaceable along the direction of axis (CL1), a pressure transmission body (3) whose outer circumferential surface is fixed to the other end of the flexible member (8), and a sensor element (42) fixed to the housing (2) and outputting a signal on the basis of a pressure applied thereto from the pressure transmission body (3). The housing (2) includes a main body portion (21) having a screw portion (24), and a cap member (22) having a press contact portion (26) which is pressed against the internal combustion engine when the screw portion (24) is screwed into the mounting hole of an internal combustion engine. The one end of the flexible member (8) is fixed to the main body portion (21).

Abstract: A combustion pressure sensor (1) includes a housing (2) having an axial hole (23), a flexible member (8) fixed at one end to the housing (2) and being displaceable along the direction of axis (CL1), a pressure transmission body (3) whose outer circumferential surface is fixed to the other end of the flexible member (8), and a sensor element (42) fixed to the housing (2) and outputting a signal on the basis of a pressure applied thereto from the pressure transmission body (3). The housing (2) includes a main body portion (21) having a screw portion (24), and a cap member (22) having a press contact portion (26) which is pressed against the internal combustion engine when the screw portion (24) is screwed into the mounting hole of an internal combustion engine. The one end of the flexible member (8) is fixed to the main body portion (21).

Abstract: An apparatus for measuring pressure comprises a housing and an actuator pressure sealed to the housing and having a shaft. The actuator is configured to be in pressure communication with a volume of gas or liquid. Upon a change in pressure, the actuator is displaced at least partially in the axial direction. A sensor detects axial displacement of a magnetically encoded target upon the change in pressure in the volume. A device for measuring pressure in an engine cylinder comprises a valve in pressure communication with an engine cylinder. The valve stem has a magnetic coding located adjacent a sensor. Axial displacement of the stem under cylinder pressure is detected and pressure is obtained.

Abstract: The present invention disclosed provides for a rugged, compact sensing device for various implementations including those of automotive, marine, and other combustion technologies that require low cost accurate pressure sensing during internal combustion engine process. In one or more aspects of the present invention, a MEMS sensor connection with a flexible circuit is presented and the communication of which is preferably achieved through the use of wire bond technology.

Abstract: A piezoresistive pressure-measuring plug for a combustion engine. The pressure-measuring plug includes a plug body having a threaded plug body part with an external thread for screwing the plug body into a cylinder of the combustion engine, and a sealing plug body part forming a tip of the plug for providing a seal between the plug body and the combustion engine. The plug body further includes a sensing body part positioned between the threaded plug body part and the sealing plug body part. The sensing body part includes a cylindrical body part, a moving part, and a sensing structure that form a single integral piece. The sensing structure forms a connection between the cylindrical body part and the moving part, and allows the moving part to move relatively to the cylindrical body part along a cylinder axis of the cylindrical body part.

Abstract: A method and a circuit for processing a signal supplied by a piezoelectric sensor (10) indicating the cylinder pressure of a piston engine such as a heat engine. Undesirable variations in the value of the signal supplied by the sensor and corresponding to plateaux in the pressure are compensated by a closed-loop servo control which is suitable for setting an output signal to a predetermined constant reference value, independently of undesirable variations in the signal from the sensor (10). The value of the output signal is sampled, and at each sampling moment, if the absolute value of the variation in the output signal is less than a comparison value, the servo control is kept active. A circuit for processing and a pressure-measuring device including a circuit of this kind is also described.

Abstract: This heater plug includes: A tubular body (2), A finger (4) mounted inside the tubular body (2) and protruding outside the body at one extremity of this body, and A pressure sensor (8), A membrane (28) extending between the body (2) and the finger (4) enabling a relative longitudinal movement between the finger (4) and the body (2). The pressure sensor (8) is arranged between firstly a first bearing part (38) connected via a first tubular part (20, 20?) to the finger (4) in the vicinity of the membrane (28) and a second bearing part (40) connected via a second tubular part (22) to the body (2).

Abstract: The invention relates to a pressure measuring device comprising a housing, a rod which is movable in the axial direction in the housing under the effect of combustion chamber pressure and protrudes from the housing, a sensor for measuring combustion chamber pressure acting on the rod, and a diaphragm attached to the housing and through which the rod extends. According to the invention, a second diaphragm said second diaphragm generating a return force when the rod undergoes axial displacement caused by pressure on the rod is disposed between the sensor and the diaphragm.

Abstract: A compression sensor gasket assembly includes a gasket body and a pressure sensor assembly having a sensor tip and an externally threaded portion. The gasket body has opposite sides extending between an opening configured to register with a cylinder bore of an internal combustion engine and an outer periphery. A notch extends into the outer periphery to a recessed surface. A sensor receptacle configured for at least partial receipt of the pressure sensor assembly extends from the recessed surface to the opening. A nut is disposed in the notch with internal threads of the nut being aligned for threaded engagement with the externally threaded portion of the pressure sensor assembly. The nut has bifurcated fingers extending laterally outwardly from an outer surface. The bifurcated fingers have inner surfaces bonded to at least one of the opposite sides of the gasket body to facilitate proper orientation of the pressure sensor assembly.