Kraftfahrzeug mit einem mit kohlenstofffreiem Kraftstoff betriebenen Verbrennungsmotor mit daran angeschlossenem Abgassystem

• Main Authors: Macherhammer, Josef, Raser, Bernhard, Hadl, Klaus
• Format: Patent
• Language: German
• Published: 12.01.2023
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

The invention relates to a motor vehicle having an internal combustion engine which is operated with carbon-free fuel, such as hydrogen or ammonia, and an exhaust gas system (1) connected thereto, said exhaust gas system having at least one first nitrogen oxide reduction catalytic converter (2), which preferably contains vanadium. According to the invention, the exhaust gas system (1) further has a heat exchanger (3), which can be used to recover energy, wherein an adjustable portion of the exhaust gas emitted from the internal combustion engine can be conveyed through the heat exchanger (3) before being supplied to the nitrogen oxide reduction catalytic converter (2). Two nitrogen oxide reduction catalytic converters can also be arranged one behind the other, wherein the reduction medium can be the fuel. The operating method according to the invention teaches that the portion of the exhaust gas conveyed through the heat exchanger (3) in connection with an operation of the heat exchanger (3) and/or an energy recovery device (6) is chosen such that a temperature of the first nitrogen oxide reduction catalytic converter (2) is kept at least predominantly below a definable upper temperature limit.