Device for measuring the particle emissions of an internal combu

Details Device for measuring the particle emissions of an internal combu Device for measuring the particle emissions of an internal combu

1988-10-07

1990-05-08

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

73116, F01N 300

Patent

active

049227149

ABSTRACT:
A device for measuring particle emissions of an internal combustion engine, in particular the soot concentration in the exhaust gas, has a signal transmission route, located between a transmitter and a receiver, which traverses a flow of exhaust gas carried in an exhaust gas tube of the engine. To avoid soiling of the active elements of the transmitter and receiver that would cause inaccuracies in measurement, the signal transmission route is embodied as a beam of light, which passes through two diametrically opposed openings in the wall of the exhaust tube. The light-admitting openings are each closed with a respective transparent disk. The disks are heatable and are heated to a temperature above the burnoff temperature of the particles. Appropriate light emitting and receiving elements are used in combination with appropriate heating and evaluation circuits which indicate the soot concentration and which control fuel input to change the soot concentration.

REFERENCES:
patent: 3362387 (1968-01-01), Neumann
patent: 3384746 (1968-05-01), Benz
patent: 4501138 (1985-02-01), McCandless

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