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AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsWilli Neff, Klaus Pochner, Gerhard Lepperhoff, Georg Lütkemeyer
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Process and device for operating an internal combustion engine with less pollutant emission, whose exhaust gas is subjected to an electrical aftertreatment during engine operation to convert pollutants, the emissions of which are measured. To improve a process with the features mentioned initially, so that on the one hand the desired reduction of emissions of the internal combustion engine is achieved during its entire time of operation, but on the other hand so that the design of the electrical system of the internal combustion engine does not have to be unreasonably large and thus costly, the electrical aftertreatment of the exhaust gas occurs only during the portion of the operating time during which emission peaks occur.
A process for operating an internal combustion engine with less pollutant emission, whose exhaust gas is subject to an electrical aftertreatment during engine operation to convert pollutants, the emissions of which are measured, wherein the electrical aftertreatment of the exhaust gas occurs only for portions of operating time during warmup and during load change of the engine, and only during times in which emission peaks occur, and wherein the electrical aftertreatment is adapted to be turned on as soon as the starter is actuated, at the beginning of fuel injection.
A process for operating an internal combustion engine with less pollutant emission, whose exhaust gas is subject to an electrical aftertreatment during engine operation to convert pollutants, the emissions of which are measured, wherein the electrical aftertreatment of the exhaust gas occurs only for portions of operating time during warmup and during load change of the engine, and only during times in which emission peaks occur, and wherein the electrical aftertreatment is a barrier discharge excited at a frequency between about 500 Hz and about 500 kHz with an alternating voltage that comprises one of sinusoidal, rectangular and narrow pulse-shaped signals.
A process for operating an internal combustion engine with less pollutant emission, whose exhaust gas is subject to an electrical aftertreatment during engine operation to convert pollutants, the emissions of which are measured, wherein the electrical aftertreatment of the exhaust gas occurs only for portions of operating time during warmup and during load change of the engine, and only during times in which emission peaks occur, and wherein the electrical aftertreatment comprises electrical discharges and each electrical discharge occurs for less than about 10 to about 20 seconds following each load change.
A device for low-pollution operation of an internal combustion engine having an exhaust line, and a chemical reactor in communication with the exhaust line, the device comprising means for generating electrical discharges in the exhaust gas, the means for generating electrical discharges having a power connection (56) to a generator (61) and a battery (62) for a power supply, the device further comprising a regulator means from which the beginning, the end, the frequency, the energy, and characteristics of the electrical discharges can be regulated, wherein the regulator is adapted to execute regulation of characteristics of the electrical discharges when the internal combustion engine is operating, during a warmup and during a load change of the engine, and only in conjunction with the occurrence of emission peaks, and wherein the electrical discharges are excited at a frequency of between about 500 Hz to about 500 kHz, with an alternating voltage comprising one of sinusoidal, rectangular, and narrow pulse-shaped signals.
Dependencies are inferred from the claim text.