초록 ▼

A method and system for controlling EGR rats of an internal combustion engine includes measuring a mass airflow passing to the intake throttle and a desired mass airflow. An error signal is produced representative of a difference between the measured mass airflow and the desired mess airflow. A pair

A method and system for controlling EGR rats of an internal combustion engine includes measuring a mass airflow passing to the intake throttle and a desired mass airflow. An error signal is produced representative of a difference between the measured mass airflow and the desired mess airflow. A pair of control signals is produced in response to such produced error signal. One of the pair of control signals is used to adjust the intake throttle to control mass airflow through such intake throttle. The other one of the pair of control signals is used to adjust EGR flow through the EGR valve. The pair of control signals operates the intake throttle and the EGR valve to drive the error signal to a null. In one embodiment, one of the control signals used to adjust the EGR valve is used to provide such adjustment only when the intake throttle is in a position to provide substantially maximum mass airflow through such intake throttle to the intake of the engine. In another embodiment, the pair of control signals operates to drive the throttle to a closed position only when such error signal is unable to be driven towards the null solely from adjustment by the EGR valve.

대표청구항 ▼

A method and system for controlling EGR rats of an internal combustion engine includes measuring a mass airflow passing to the intake throttle and a desired mass airflow. An error signal is produced representative of a difference between the measured mass airflow and the desired mess airflow. A pair

A method and system for controlling EGR rats of an internal combustion engine includes measuring a mass airflow passing to the intake throttle and a desired mass airflow. An error signal is produced representative of a difference between the measured mass airflow and the desired mess airflow. A pair of control signals is produced in response to such produced error signal. One of the pair of control signals is used to adjust the intake throttle to control mass airflow through such intake throttle. The other one of the pair of control signals is used to adjust EGR flow through the EGR valve. The pair of control signals operates the intake throttle and the EGR valve to drive the error signal to a null. In one embodiment, one of the control signals used to adjust the EGR valve is used to provide such adjustment only when the intake throttle is in a position to provide substantially maximum mass airflow through such intake throttle to the intake of the engine. In another embodiment, the pair of control signals operates to drive the throttle to a closed position only when such error signal is unable to be driven towards the null solely from adjustment by the EGR valve. lt et al.; US-4548253, 19851000, Funatani et al.; US-4569109, 19860200, Fetouh; US-4570584, 19860200, Uetsuji et al.; US-4617122, 19861000, Kruse et al.; US-4622933, 19861100, Fukuo et al.; US-4644912, 19870200, Umeha et al.; US-4656981, 19870400, Murata et al.; US-4660512, 19870400, Binder et al.; US-4672930, 19870600, Sumi; US-4674455, 19870600, Tsuboi; US-4684267, 19870800, Fetouh; US-4688446, 19870800, Ishikawa; US-4691590, 19870900, Geringer et al.; US-4696266, 19870900, Harada; US-4711823, 19871200, Shiina; US-4736717, 19880400, Fujikawa et al.; US-4793297, 19881200, Fujii et al.; US-4802269, 19890200, Mukai et al.; US-4819592, 19890400, van Ligten; US-4819593, 19890400, Bruener et al.; US-4822414, 19890400, Yoshikawa et al.; US-4828632, 19890500, Adam et al.; US-4834784, 19890500, Bidanset; US-4836045, 19890600, Lobig; US-4838909, 19890600, Bidanset; US-4853179, 19890800, Shiina; US-4867806, 19890900, Shiina; US-4892068, 19900100, Coughlin; US-4898133, 19900200, Bader; US-4909197, 19900300, Perr; US-4926814, 19900500, Bonde; US-4928550, 19900500, Sakai et al.; US-4934442, 19900600, Futamura et al.; US-4949687, 19900800, Emmersberger; US-4958537, 19900900, Diehl et al.; US-4964378, 19901000, Tamba et al.; US-4986224, 19910100, Zuffi; US-5002023, 19910300, Butterfield et al.; US-5038727, 19910800, Burns et al.; US-5057274, 19911000, Futamura et al.; US-5085184, 19920200, Yamada et al.; US-5152264, 19921000, Evans; US-5163341, 19921100, Murrish et al.; US-5197422, 19930300, Oleksy et al.; US-5197425, 19930300, Santi; US-5207120, 19930500, Arnold et al.; US-5241873, 19930900, Hormann; US-5243878, 19930900, Santi; US-5265700, 19931100, Santi; US-5282397, 19940200, Harkness et al.; US-5323745, 19940600, Sato et al.; US-5357917, 19941000, Everts; US-5370093, 19941200, Hayes; US-5375571, 19941200, Diehl et al.; US-5421297, 19950600, Tamba et al.; US-5463809, 19951100, Hoffman et al.; US-5497735, 19960300, Kern et al.; US-5524581, 19960600, Rush et al., 123/090.34; US-5555776, 19960900, Gazza; US-5556441, 19960900, Courtwright et al.; US-5560333, 19961000, Genouille; US-5615586, 19970400, Phillips et al.; US-5651336, 19970700, Rygiel et al.; US-5711264, 19980100, Jezek et al.; US-5809958, 19980900, Gracyalny; US-5823153, 19981000, Santi et al.; US-5863424, 19990100, Lee; US-5887678, 19990300, Lavender; US-5904124, 19990500, Poehlman et al.; US-5964198, 19991000, Wu; US-5979392, 19991100, Moorman et al.; US-5988135, 19991100, Moorman et al.; US-6006721, 19991200, Shannon et al.; US-6047667, 20000400, Leppanen et al.; US-6055952, 20000500, Gau; US-6076426, 20000600, Genouille; US-6109230, 20000800, Watanabe et al.; US-6116205, 20000900, Troxler et al.; US-6126499, 20001000, Katayama et al.; US-6170449, 20010100, Saiki et al.; US-6213081, 20010400, Ryu et al.; US-6269786, 20010800, Snyder et al.; US-6293981, 20010900, Holderle et al.; US-6395049, 20020500, Knodler et al.; US-6460504, 20021000, Phillips et al., 123/196.R , 19961000, Daxer et al., 123/279; US-5657726, 19970800, Diggs; US-5868112, 19990200, Mahakul et al.; US-5954038, 19990900, Warwick et al. s propagate through the liquid fuel, causing the non-uniform size droplets to break apart into droplets of substantially uniform size; whereby an improvement of the combustion of the liquid fuel results. 7. A device according to claim 6, wherein the sealed housing has a threaded end, the threaded end cooperatively seats into a threaded aperture such that the threaded end of the housing is proximate to the liquid fuel.8. A device according to claim 6, wherein the transducer includes at least one piezoelectric device, each piezoelectric device is sized and configured to provide characteristic ultrasonic wavefronts for a respective specified liquid fuel type.9. A device according to claim 6, wherein the electrical excitation source is a function generator for producing the at least one electrical excitation signal having at least one frequency and amplitude; whereby the excitation signal has cyclical characteristic.10. A device according to claim 9, further including means for electrically connecting the transducer to the electrical excitation source, wherein the means extends through the housing from the transducer to the source.11. A device according to claim 9, further including at least two transducers in each housing, wherein each transducer receives an excitation signal having a respective frequency and amplitude, whereby each the wavefront, generated by each respective transducer, has a characteristic independent of the other generated wavefronts, for breaking apart specific droplets of specific liquid fuel types so as to produce droplets of uniform size irrespective of the fuel types.12. A device according to claim 6, wherein each housing is made of material impervious to the temperatures of combustion.13. A device according to claim 12, wherein each sealed housing has a threaded end, the threaded end cooperatively seating into a threaded aperture of an internal combustion engine such that the threaded end of the housing is proximate to the liquid fuel and each of the at least one transducers is secured in the threaded end of the housing.