Hybrid technology has been widely developed for various vehicles in recent years.However,due to the limitation of size and space,it is difficult to apply the technology in the small two-wheeled vehicles,especially sco...Hybrid technology has been widely developed for various vehicles in recent years.However,due to the limitation of size and space,it is difficult to apply the technology in the small two-wheeled vehicles,especially scooters.For scooters,the hybrid system could be with small capacity,and must be simple and affordable.The Purpose of this study is to analyze and develop the conceptual designs of fuel-electric hybrid systems especially for scooters.Firstly,the graph called ＂function power graph（FPG）＂ is defined,which transforms traditional mechanical schematic diagrams into simplified graphs,and makes the characteristics of hybrid systems can be identified clearly.Based on the FPG,a systematic method for synthesizing all possible arrangements of hybrid systems,then,is developed,and the hybrid system arrangements with one internal combustion engine（ICE）,one electric machine（M/G）,and some mechanical clutch units are all enumerated.In order to evaluate the applicability of these design concepts for Scooters,twelve system functions and three system complexities are defined,and this evaluation process can be automated numerically by using a computer program,which is Matlab in this study.With the systematic design and analysis methods developed,the function capability and characteristics of current hybrid systems can be easily identified,and also,new and useful hybrid systems are found for future possible applications.展开更多
To investigate the feasibility and effectiveness of the designed control system used for driving and steering of an electric scooter, a model of differential steering was developed. The function of electronic differen...To investigate the feasibility and effectiveness of the designed control system used for driving and steering of an electric scooter, a model of differential steering was developed. The function of electronic differential steering was realized by controlling the speed of right or left wheel and the corresponding speed difference. The control system was simulated with MATLAB/SIMUL1NK and ADAMS. It is found that the motor load torque is proportional to the tire vertical force, so the adhesive capacity is met. The electric scooter can operate stably on the slope road at a speed of more than 1.5 m/s and turn stably at yawing velocities of 10° and 90°per second.展开更多
BACKGROUND: To determine the frequency, characteristics, and use of resources related to electric scooter(e-scooter) injuries in the emergency department(ED) of a major metropolitan area hospital.METHODS: We performed...BACKGROUND: To determine the frequency, characteristics, and use of resources related to electric scooter(e-scooter) injuries in the emergency department(ED) of a major metropolitan area hospital.METHODS: We performed a retrospective review of all ED presentations related to e-scooter injuries at a level I trauma center between May 2017 and February 2020. We identified ED presentation data, injury-related data, patients’ clinical course after evaluation, injury diagnosis, surgical procedures, and ED readmissions.RESULTS: A total of 3,331 patients with e-scooter injuries presented to the ED over a 34-month period. There was a 6-fold increase in e-scooter-related injuries presenting to the ED, from an average of 26.9 injuries per month before the introduction of shared e-scooter services in August 2018 to an average of 152.6 injuries per month after its introduction. The average injury rate during weekdays was 3.27 per day, with the majority of injuries occurring in the afternoon. The most common mechanism of injury was rider fall(79.1%). There were a total of 2,637 orthopedic injuries, of which 599(22.7%) were fractures. A total of 296(8.9%) patients were hospitalized following the initial ED admission, and 462 surgeries were performed within 7 days of ED arrival.CONCLUSIONS: The introduction of the shared e-scooter services is associated with a dramatic increase in e-scooter injuries presenting to the ED. E-scooter use carries considerably underestimated injury risks of high-energy trauma and misunderstood mechanisms of injuries. These injuries challenge the healthcare system, with a major impact on both EDs and surgical departments.展开更多
United States Consumer Product Safety Commission (CPSC) reported a 700% increase in Emergency Department (ED) visits for injuries attributed to unpowered scooter use from January through October 2000. Our objective is...United States Consumer Product Safety Commission (CPSC) reported a 700% increase in Emergency Department (ED) visits for injuries attributed to unpowered scooter use from January through October 2000. Our objective is to investigate injuries associated with the use of unpowered scooters among adolescents from the age of >9 years to 20 years in the National Electronic Injury Surveillance Study (NEISS) data set from 2007-2017. We analyzed unpowered scooter-related injuries in the NEISS data set using variables: SCOOTER, INJURED, AFTER, OFF, AT and IN;the product code for injuries related to unpowered scooters is 1329, and age ≥9 years and 9 - 19 - <99 years. Distribution by race: White 39.65%, Not Specified (NS) 38.94%, Black/African American 13.98% and Others (Asian, American Indians, Alaskan natives, Native Hawaiians, and Pacific Islanders) 7.43%. Body parts injured: head 16.19%, followed by face 8.49%, finger 8.30%, lower trunk 8.30%, ankle 5.60%, upper trunk 5.35%, internal injuries 0.99% and others 14.28%. Most of the injuries were mild: Treated and Discharged 89.80%, Hospitalized 7.68%, and Death in ED 0.05%. The locations of injuries were: Occurred at Home 43.47%, UNK 29.78%, Sports 12.63%, Public 6.49%, School 5.35%, and Street 2.22%. Injury trend: a rise until 2010, a decline until 2015 and, then a sharp rise through 2017. Injuries from the use of unpowered scooters are a rising threat that should be given attention. Outcome: Most of the injuries 69.80% were mild treated and discharged, 7.68% were hospitalized, while death in ED was 0.05%. Whereas: Transfer to referral hospital was about the same as in adults. Although most of these injuries were minor, head injuries could lead to more serious problems, and severe injuries could be life-threatening.展开更多
文摘Hybrid technology has been widely developed for various vehicles in recent years.However,due to the limitation of size and space,it is difficult to apply the technology in the small two-wheeled vehicles,especially scooters.For scooters,the hybrid system could be with small capacity,and must be simple and affordable.The Purpose of this study is to analyze and develop the conceptual designs of fuel-electric hybrid systems especially for scooters.Firstly,the graph called ＂function power graph（FPG）＂ is defined,which transforms traditional mechanical schematic diagrams into simplified graphs,and makes the characteristics of hybrid systems can be identified clearly.Based on the FPG,a systematic method for synthesizing all possible arrangements of hybrid systems,then,is developed,and the hybrid system arrangements with one internal combustion engine（ICE）,one electric machine（M/G）,and some mechanical clutch units are all enumerated.In order to evaluate the applicability of these design concepts for Scooters,twelve system functions and three system complexities are defined,and this evaluation process can be automated numerically by using a computer program,which is Matlab in this study.With the systematic design and analysis methods developed,the function capability and characteristics of current hybrid systems can be easily identified,and also,new and useful hybrid systems are found for future possible applications.
基金Supported by Scientific and Technological Project of Chongqing (CSTC2009AC6051)
文摘To investigate the feasibility and effectiveness of the designed control system used for driving and steering of an electric scooter, a model of differential steering was developed. The function of electronic differential steering was realized by controlling the speed of right or left wheel and the corresponding speed difference. The control system was simulated with MATLAB/SIMUL1NK and ADAMS. It is found that the motor load torque is proportional to the tire vertical force, so the adhesive capacity is met. The electric scooter can operate stably on the slope road at a speed of more than 1.5 m/s and turn stably at yawing velocities of 10° and 90°per second.
文摘BACKGROUND: To determine the frequency, characteristics, and use of resources related to electric scooter(e-scooter) injuries in the emergency department(ED) of a major metropolitan area hospital.METHODS: We performed a retrospective review of all ED presentations related to e-scooter injuries at a level I trauma center between May 2017 and February 2020. We identified ED presentation data, injury-related data, patients’ clinical course after evaluation, injury diagnosis, surgical procedures, and ED readmissions.RESULTS: A total of 3,331 patients with e-scooter injuries presented to the ED over a 34-month period. There was a 6-fold increase in e-scooter-related injuries presenting to the ED, from an average of 26.9 injuries per month before the introduction of shared e-scooter services in August 2018 to an average of 152.6 injuries per month after its introduction. The average injury rate during weekdays was 3.27 per day, with the majority of injuries occurring in the afternoon. The most common mechanism of injury was rider fall(79.1%). There were a total of 2,637 orthopedic injuries, of which 599(22.7%) were fractures. A total of 296(8.9%) patients were hospitalized following the initial ED admission, and 462 surgeries were performed within 7 days of ED arrival.CONCLUSIONS: The introduction of the shared e-scooter services is associated with a dramatic increase in e-scooter injuries presenting to the ED. E-scooter use carries considerably underestimated injury risks of high-energy trauma and misunderstood mechanisms of injuries. These injuries challenge the healthcare system, with a major impact on both EDs and surgical departments.
文摘United States Consumer Product Safety Commission (CPSC) reported a 700% increase in Emergency Department (ED) visits for injuries attributed to unpowered scooter use from January through October 2000. Our objective is to investigate injuries associated with the use of unpowered scooters among adolescents from the age of >9 years to 20 years in the National Electronic Injury Surveillance Study (NEISS) data set from 2007-2017. We analyzed unpowered scooter-related injuries in the NEISS data set using variables: SCOOTER, INJURED, AFTER, OFF, AT and IN;the product code for injuries related to unpowered scooters is 1329, and age ≥9 years and 9 - 19 - <99 years. Distribution by race: White 39.65%, Not Specified (NS) 38.94%, Black/African American 13.98% and Others (Asian, American Indians, Alaskan natives, Native Hawaiians, and Pacific Islanders) 7.43%. Body parts injured: head 16.19%, followed by face 8.49%, finger 8.30%, lower trunk 8.30%, ankle 5.60%, upper trunk 5.35%, internal injuries 0.99% and others 14.28%. Most of the injuries were mild: Treated and Discharged 89.80%, Hospitalized 7.68%, and Death in ED 0.05%. The locations of injuries were: Occurred at Home 43.47%, UNK 29.78%, Sports 12.63%, Public 6.49%, School 5.35%, and Street 2.22%. Injury trend: a rise until 2010, a decline until 2015 and, then a sharp rise through 2017. Injuries from the use of unpowered scooters are a rising threat that should be given attention. Outcome: Most of the injuries 69.80% were mild treated and discharged, 7.68% were hospitalized, while death in ED was 0.05%. Whereas: Transfer to referral hospital was about the same as in adults. Although most of these injuries were minor, head injuries could lead to more serious problems, and severe injuries could be life-threatening.
