There is described a method to estimate the maximum pressure (P, P) inside the combustion chamber of a cylinder (2) of an internal combustion engine (1) which comprises estimating said maximum pressure (P, P) based on the pressure value (P) obtained at the...

A method (98) of distinguishing piston slap from engine knock in a reciprocating device includes obtaining (100) a fundamental frequency of a cylinder (26), the cylinder having a thrust face and an anti-thrust face, receiving (102) a first signal from a fi...

A method 150 includes receiving 152 a noise signal sensed by a knock sensor 23 disposed in or proximate to a combustion chamber 12 of a combustion engine 10, preconditioning the noise signal to generate a preconditioned noise signal, and process the precon...

An internal combustion engine system includes: an in-cylinder pressure sensor 30; a crank angle sensor 42; and a seal portion 34 that seals a space between an outer face of a housing 301 and a wall surface of a cylinder head 32. A slope k that is a ratio o...

A method of detecting incomplete combustion, such as misfire, in a gaseous fuel operated internal combustion engine is disclosed. The method comprises receiving (step 402) a pressure data corresponding to a temporal development of an internal cylinder pres...

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...

It is possible to detect knocking appropriately in a single-cylinder internal combustion engine in which a knock sensor is mounted to a part other than a cylinder block. A crankcase (11), a cylinder block (12), and a cylinder head (13) are connected by a b...

The method involves constructing a wave equation model of a cylinder-head based on a physical model describing propagation of waves in a solid medium. Coefficients of a Fourier decomposition of a vibration signal from a cylinder pressure sensor/an accelero...