Analyzing exhaust gases from an internal combustion engine
First Claim
1. A method of obtaining representatively comparable results, when analyzing exhaust gases from different vehicle internal combustion engines, comprising varying the engine fuel supply means according to a pre-selected test program to simulate varying operating conditions, in which a monitoring device, transferring the test program to the fuel supply means of the engine, is adjusted with respect to the rated power of the actual engine and the weight of the vehicle in which it is mounted in such a manner, that acceleration changes in the engine are governed so they substantially correspond with changes in speed of the vehicle, presupposed by the program.
0 Assignments
0 Petitions
Accused Products
Abstract
Exhaust gas is sampled from an internal combustion engine operated disconnected from the transmission elements, thus braked by its inertia and internal losses only.
Before running the test it is important to find out the positions, at which the fuel supply means ensures idle running and maximum fuel supply, respectively. A monitoring device is designed to find out these positions, and then to run a test cycle between those positions. The monitoring device may include means for running, prior to the actual test, a short conditioning program at the engine, to ensure that the same has attained a desired normal temperature, when the test starts.
5 Citations
17 Claims
- 1. A method of obtaining representatively comparable results, when analyzing exhaust gases from different vehicle internal combustion engines, comprising varying the engine fuel supply means according to a pre-selected test program to simulate varying operating conditions, in which a monitoring device, transferring the test program to the fuel supply means of the engine, is adjusted with respect to the rated power of the actual engine and the weight of the vehicle in which it is mounted in such a manner, that acceleration changes in the engine are governed so they substantially correspond with changes in speed of the vehicle, presupposed by the program.
-
11. A device for obtaining representatively comparable results, when analysing exhaust gases from different vehicle internal combustion engines by varying the engine fuel supply means according to a preselected test program to simulate varying operating conditions, comprising
a monitoring unit for imposing said test program upon the engine, mechanical means for varying the engine fuel supply means, a first means adapted to sense ignitions at one cylinder of the engine and to transform those ignitions into governing impulses, a second means operable by said pulses and adapted to adjust said mechanical means for idle running of the actual engine, and a third means, likewise operable by said pulses and adapted to adjust the monitoring unit for a position at the fuel supply control means corresponding to a condition, where the acceleration of the engine ceases.
Specification