Method and apparatus for analyzing the composition of the exhaust gas of any internal combustion engine
First Claim
1. A method of analyzing the composition of the exhaust gas of an internal combustion engine comprising:
- providing a light beam from a light source which can be absorbed by the components in the exhaust gas to be measured,periodically interrupting the light beam, dividing the thus interrupted light beam into a plurality of parallel subdivided beams, directing the subdivided beams through respective measurement cells which are simultaneously traversed by the exhaust gas to be analyzed,filtering the output of the respective cells according to the components of the gas to be analyzed thereby,detecting the thus filtered light output and producing an electrical signal which is a function of the magnitude of said light output to provide indication of the magnitude of the components in the exhaust gas and thereby of the composition thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
A device for analyzing the composition of the exhaust gas of an internal combustion engine in which a light source provides a light beam absorbable by the exhaust gas, and a plurality of measurement cells are traversed by radiation of the light beam while the exhaust gas flows through the cells. A corresponding number of radiation detectors are arranged after the measurement cells to receive the absorption attenuated light radiation and to produce an electrical measurement signal. At least one light interrupter periodically interrupts the light radiation. A particularly accurate analysis of the composition of the exhaust gas is obtained, even for dynamic operating conditions of the internal combustion engine, during every phase of the combustion cycle if the light interrupter is arranged directly behind the light source and the light radiation used for the measurement is periodically interrupted as a whole and if, furthermore, each of the measurement cells has a respective radiation filter associated therewith and with the radiation detectors and if a light dividing device is arranged between the light interrupter and the measurement cells for the simultaneous application of the light radiation on all measurement cells.
50 Citations
13 Claims
-
1. A method of analyzing the composition of the exhaust gas of an internal combustion engine comprising:
-
providing a light beam from a light source which can be absorbed by the components in the exhaust gas to be measured, periodically interrupting the light beam, dividing the thus interrupted light beam into a plurality of parallel subdivided beams, directing the subdivided beams through respective measurement cells which are simultaneously traversed by the exhaust gas to be analyzed, filtering the output of the respective cells according to the components of the gas to be analyzed thereby, detecting the thus filtered light output and producing an electrical signal which is a function of the magnitude of said light output to provide indication of the magnitude of the components in the exhaust gas and thereby of the composition thereof. - View Dependent Claims (2, 3)
-
-
4. A measuring apparatus for analyzing the composition of the exhaust gas of an internal combustion engine, said apparatus comprising:
-
a light source for producing a light beam which can be absorbed by components in an exhaust gas which are to be measured, a plurality of measurement cells each for a respective gas component of the exhaust gas which is to be measured, conduit means for passage therethrough of the exhaust gas and of light from the light source, means supporting said cells in said conduit means for simultaneous passage of the exhaust gas and light therethrough, a plurality of radiation filters one for each cell tuned to the gas component to be measured, a plurality of radiation detectors each arranged opposite each respective measurement cell, said filters being disposed between the measurement cells and the respective detectors such that the detectors each receive, via the respective filter, absorption attenuated light radiation to procude an electrical measurement signal as a function thereof, light interrupter means for the periodic interruption of the light beam from the light source, said light interrupter means being arranged in the path of the light beam between said light source and said measurement cells for periodically interrupting said light beam, and, light dividing means between the light interrupter means and measurement cells for dividing the interrupted light beam produced by said light interrupter means and simultaneously applying the thus divided interrupted light beam to all of the measurement cells. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification