Method for measuring cylinder specific parameters in a combustion engine
Patent, 2005
The invention concerns a method to measure parameters in the combustion chamber of a piston engine that comprises an ignition system. An alternating voltage is applied across the secondary winding of the ignition coil and the value of the current that arises in a measurement circuit that co-operates with the secondary winding is measured. The value of the current depends on the resistance (R1) of the measurement circuit, on the inductance (L1) and resistance of the secondary winding, and on the impedance of the combustion chamber, i.e. on its capacitance (C1) and its resistance. For example, top dead centre, the pressure in the cylinder, analysis of the ionic current and change of the burning time can be determined by means of the method
measurement technique
engine diagnostic
combustion engine
ion current
Inventor
Jörgen Bengtsson
SEM AB
Thomas Hammarström
Power grids and Components
WO2001079803A1
10257820
Subject Categories (SSIF 2011)
Other Mechanical Engineering
Geotechnical Engineering
Other Electrical Engineering, Electronic Engineering, Information Engineering
Areas of Advance
Transport
Energy
Materials Science
Roots
Basic sciences
Driving Forces
Innovation and entrepreneurship