A power generating set includes an engine operable in response to a flow of fuel to produce a flow of exhaust gas, a generator coupled to the engine and operable in response to operation of the engine to produce a total electrical power, and a primary load electrically connected to the generator to receive a portion of the total electrical power, the primary load having a cyclical pattern. A battery bank is selectively connected to the generator to receive a portion of the total electrical power and an insulated-gate bipolar transistor (IGBT) is positioned to selectively transition between a connected state and a disconnected state. The battery bank is connected to the generator to charge the battery bank when the IGBT is in the connected state and is disconnected from the generator when the IGBT is in the disconnected state.

A generator system includes (i) an internal combustion engine, (ii) an exhaust gas outlet, connected to the internal combustion engine, for venting exhaust gasses, and (iii) a condenser, connected to the exhaust gas outlet, for condensing water from exhaust gasses.

The temperature of exhaust gas discharged from a compact air-cooled engine used as a power source for an engine-driven working machine is reduced. An engine has a muffler mounted directly to the exhaust opening of the cylinder, and a resin muffler cover covering the muffler. An exhaust gas restriction member is provided to a wall surface of the muffler, and two exhaust passages serving as outlets for exhaust gas are formed in the exhaust gas restriction member. The exhaust passages are arranged independent of each other, and the streams of discharged exhaust gas are discharged to be slightly separated from each other as the streams flow away from the exhaust openings. The separated streams of discharged exhaust gas form a negative pressure space between the streams promoting the introduction of a cooling air stream into the negative pressure portion. Thus, the temperature of the exhaust gas can be reduced.

An engine is configured so that a muffler is affixed to the exhaust opening of the cylinder, and the air-cooled cylinder is cooled by a cooling fan. The engine is provided with a muffler cover for covering the muffler, and exhaust gas is discharged inside the muffler cover along the wall surface of the muffler. A second cooling air is combined with the exhaust gas flow from the upstream side thereof to be parallel thereto, and a first cooling air having been caused to flow under the muffler is caused to perpendicularly impinge against the exhaust gas flow on the downstream side thereof. Thus, the cooling airs are combined inside the muffler cover with the exhaust gas flow, and as a result the temperature of the exhaust gas is sufficiently reduced at the time when the exhaust gas is discharged from the opening of the muffler cover to the outside.

A muffler having a muffler housing with a muffler chamber formed therein includes an outlet stub. In the stub, a channel is formed through which exhaust gases escape. The channel has a throttle location with a smallest flow cross-section and a discharge opening with a discharge flow cross-section. The channel is bounded by a wall. The flow cross-section increases substantially continuously from the smallest flow cross-section to the discharge flow cross-section at least in a section in the direction from the throttle location to the discharge opening. The stub has a fastening location at which it is held in an outlet opening of the muffler housing. The wall is closed continuously over its circumference from the throttle location to the discharge opening. The section of the channel extends in a sectional plane containing a center axis of the channel into a longitudinal section of the stub having the fastening location.

A noise arresting system includes a landscape maintenance implement that has an internal combustion engine and the internal combustion engine has an exhaust. A resonator has a first end, a second end and a peripheral wall extending therebetween. The first end and the second end each is open and the resonator is substantially hollow. An intake pipe is insertably positioned within the first end. The intake pipe is fluidly coupled to the exhaust to reduce a sound level of the exhaust. An exhaust pipe has a primary end, a secondary end and a flexible section extending between the primary end and the secondary end. The primary end is insertably positioned within the second end. The flexible section is bendable to direct the secondary end away from the resonator at a selected angle.

A handheld work apparatus includes a combustion engine and an exhaust muffler. A first muffler chamber and a second muffler chamber are formed in the exhaust muffler. The exhaust muffler includes an exhaust gas after-treatment unit which includes at least one through-flow unit. The through-flow unit is disposed in a flow path from the first muffler chamber into the second muffler chamber. The thickness of the through-flow unit measured from an upstream end face to a downstream end face of the through-flow unit in the region of the through-flow unit passed through by a flow of exhaust gas is at least 10 mm across at least 70% of the cross section. The exhaust gas after-treatment unit does not have a catalytically effective coating.