초록 ▼

A humidity compensation system for an internal combustion engine includes a humidity sensor sensing relative humidity of intake air, a temperature sensor sensing intake air temperature, a pressure sensor sensing intake air pressure and a control circuit computing a specific humidity (SH) value based

A humidity compensation system for an internal combustion engine includes a humidity sensor sensing relative humidity of intake air, a temperature sensor sensing intake air temperature, a pressure sensor sensing intake air pressure and a control circuit computing a specific humidity (SH) value based on the sensor outputs. The control circuit is configured to compute one or more of an adjusted air-to-fuel ratio command as a function of SH and a default air-to-fuel ratio command, an adjusted ignition timing command as a function of SH, engine speed and a default ignition timing command and an adjusted boost pressure command as a function of SH and a default boost pressure command. The control circuit is operable to control any of fueling, ignition timing and boost pressure based on the corresponding adjusted air-to-fuel ratio, ignition timing and boost pressure commands to thereby compensate for humidity effects on engine operation.

대표청구항 ▼

A humidity compensation system for an internal combustion engine includes a humidity sensor sensing relative humidity of intake air, a temperature sensor sensing intake air temperature, a pressure sensor sensing intake air pressure and a control circuit computing a specific humidity (SH) value based

A humidity compensation system for an internal combustion engine includes a humidity sensor sensing relative humidity of intake air, a temperature sensor sensing intake air temperature, a pressure sensor sensing intake air pressure and a control circuit computing a specific humidity (SH) value based on the sensor outputs. The control circuit is configured to compute one or more of an adjusted air-to-fuel ratio command as a function of SH and a default air-to-fuel ratio command, an adjusted ignition timing command as a function of SH, engine speed and a default ignition timing command and an adjusted boost pressure command as a function of SH and a default boost pressure command. The control circuit is operable to control any of fueling, ignition timing and boost pressure based on the corresponding adjusted air-to-fuel ratio, ignition timing and boost pressure commands to thereby compensate for humidity effects on engine operation. 9910400, Rossignol; US-5033442, 19910700, Perr et al.; US-5046472, 19910900, Linder; US-5072882, 19911200, Taue et al.; US-5082180, 19920100, Kubo et al.; US-5094215, 19920300, Gustafson; US-5109822, 19920500, Martin; US-5121730, 19920600, Ausman et al.; US-5133645, 19920700, Crowley et al.; US-5141164, 19920800, Ohno et al.; US-5143291, 19920900, Grinsteiner; US-5155461, 19921000, Teerman et al.; US-5201295, 19930400, Kimberley et al.; US-5221046, 19930600, Timmer; US-5230613, 19930700, Hilsbos et al.; US-5235954, 19930800, Sverdlin; US-5265804, 19931100, Brunel; US-5271563, 19931200, Cerny et al.; US-5295469, 19940300, Kariya et al.; US-5335852, 19940800, Muntean et al.; US-5347970, 19940900, Pape et al.; US-5353991, 19941000, De Nagel et al.; US-5370095, 19941200, Yamaguchi et al.; US-5413076, 19950500, Koenigswieser et al.; US-5441028, 19950800, Felhofer; US-5460329, 19951000, Sturman et al.; US-5477828, 19951200, Barnes; US-5485820, 19960100, Iwaszkiewicz; US-5485957, 19960100, Sturman; US-5526791, 19960600, Timmer et al.; US-5622152, 19970400, Ishida; US-5682858, 19971100, Chen et al.; US-5687693, 19971100, Chen et al.; US-5720261, 19980200, Sturman; US-5738075, 19980400, Chen et al.; US-5826562, 19981000, Chen et al.; US-5833146, 19981100, Hefler; US-6024296, 20000200, Wear et al. r cap from the fuel filler flange. 27. The apparatus of claim 23 wherein the switch includes a magnetic switch mounted on the fuel tank and a magnet mounted on the filler cap. 28. The apparatus of claim 22 wherein the switch includes a switch member mounted on the filler cap that does not interfere with a sealing of the fuel filler flange with the filler cap. 29. The apparatus of claim 28 wherein the fuel filler flange has a threaded portion and the filler cap has atop and an annular skirt with threads thereon that engage the threaded portion of the flange, and wherein the switch member is mounted on the annular skirt in between the threads and the top. 30. The apparatus of claim 28 wherein the filler cap has a top, an annular skirt with internal threads, and an unthreaded outer surface and wherein the switch member is mounted on the annular skirt. 31. The apparatus of claim 28 wherein the filler cap has a top, an annular skirt with internal threads, and an unthreaded outer surface and wherein the switch member is mounted on the top. 32. The apparatus of claim 21 further comprising a key and key switch that has multiple switch positions, including at least a fuel cap unlock position wherein the fuel cap is not removable from the fuel tank if the key is placed in a position other than the fuel cap unlock position. 33. A powered implement, comprising: a) a frame; b) an internal combustion en