A knock sensor including a body, having a detection assembly able to measure vibrations, and a metal mount having a support ring on which the detection assembly rests, a peripheral casing to protect the detection assembly, made from a thermoplastic material applied by overmolding at least in part around the body. The mount includes a lower flange below the support ring and the lower flange is bored with attachment holes, which improve its sealing.

A pressure detection signal processing device, engine control system, and non-transitory computer readable medium storing a program are provided. A current-voltage conversion part that converts a current signal corresponding to charge generated by a piezoelectric element in accordance with received pressure into a voltage signal, and digital signal processing parts that perform correction for removing a drift caused by a leakage current of the piezoelectric element on the voltage signal through digital signal processing are provided. The digital signal processing parts include a differentiation processing part that performs differentiation processing on the voltage signal, an integration processing part that performs integration processing on the signal having been subjected to the differentiation processing, and an integration processing part that further performs integration processing on the signal having been subjected to the integration processing.

An electrical connector includes two lateral mounting bush. A knock sensor which delivers data representative of the operation of a fuel injector is integrally overmoulded in one of the mounting bush. The knock sensor includes a piezoelectric member arranged between a base member and a seismic member.

A method for managing knock in a cylinder of an internal combustion engine, in a system including at least one acoustic sensor and a processor, in order to take into account acoustic pollution resulting from a noise, the method including: forming and digitizing the signals of the acoustic sensor, applying a bandpass filter to obtain a filtered noise, determining an adjustable gain-correction function using a gain-correction curve and, depending on the angular position of the end of injection, the point on the gain-correction curve to be used to convert the filtered noise into a corrected knock score, comparing a corrected knock score thus obtained to a knock decision threshold, to correct the timing advance, the gain-correction curve being defined by a calibration value and four angular points obtained by calculation based on the start and end positions of a knock-observation window and on a known characteristic of the noise.

A combustion control part of a control device for an internal combustion engine configured to calculate a first vibration level of an engine body at a first judgment frequency band of a second overtone of a specific frequency band based on vibration acceleration detected by a vibration sensor and, when the first vibration level is less than a predetermined first reference vibration level set in advance according to the engine operating state, to correct one or both of a target injection amount and target injection timing so that the first vibration level becomes the first reference vibration level or more.

A knock sensor including a body, having a detection assembly able to measure vibrations, and a metal mount having a support ring on which the detection assembly rests, a peripheral casing to protect the detection assembly, made from a thermoplastic material applied by overmolding at least in part around the body. The mount includes a lower flange below the support ring and the lower flange is bored with attachment holes, which improve its sealing.

Disclosed is a method for forming a spacer extending at least partially within the length of a central bore passing from one side to the other of a barrel of a mounting base of an accelerometer sensor, the central bore being designed to receive a fastening element for fixing the mounting base onto a support element, the fastening element being centered by the spacer in the central bore, the mounting base being at least partially surrounded by an encapsulation of overmolded plastic material. When the plastic material is overmolded around the mounting base to form the encapsulation, a part of the plastic material passes through the barrel to form the spacer while fixing it to the encapsulation. Also described is a mounting base with at least one channel for the passage of the plastic material, and to an accelerometer sensor equipped with such a mounting base.

A method of detecting uncontrolled combustion in an internal combustion engine includes sampling in-cylinder pressure sensor configured to measure pressure in a cylinder of the engine and generate a pressure signal, calculating a combustion intensity metric based on the pressure signal, determining a parameter describing how close the engine is to an uncontrolled combustion condition based on the combustion intensity metric, and controlling a substitution rate of a first fuel and a second fuel based on one or more of the parameter and the combustion intensity metric.

Provided is a knocking sensor with a support member, a piezoelectric element, a pair of electrode parts, a resistor and a case. The resistor has a resistor body formed with a metal film and connected in parallel to the pair of electrode parts. The resistor also has an outer coating film applied to cover the metal film. The outer coating film is formed of a resin material having a higher thermal deformation temperature than that of a resin material of the case.

A method and control device for automatically identifying knocking in an internal combustion engine, wherein, in a predefined measurement time frame, a signal of the knocking sensor is received and evaluated with respect to a criterion for detecting knocking. A basic threshold value predefined for the identification of knocking is modified by a predefined variable interference factor, which depends on a relative point in time at which an inlet valve of at least one of the cylinders closes in relation to a predefined reference point. A signal based on the sensor signal is only identified as knocking if it reaches at least the modified basic threshold value.