In this study, it is aimed to determine the ranking importance levels of the stages to be taken into consideration for new product development on a global scale in the automotive design process. New product design act...In this study, it is aimed to determine the ranking importance levels of the stages to be taken into consideration for new product development on a global scale in the automotive design process. New product design activity and stage-gate process differences between local automotive firms (serial production factory and stage-gate department in Turkey) and global automotive companies (serial production factory and stage-gate department in Turkey) are examined comparatively in the research area. In the automotive industry, which has been developing for a century, the question of how the local company products operating in the last sixty years have not been able to spread globally or how to develop global products is the background question of the research. For this purpose, one on one interviews were held with the managers of 3 national and 3 international automotive companies, who worked in the same region and who had previously designed a new vehicle, with design and product development departments.?According to?the data obtained by the AHP (Analytic Hierarchy Process) in the automotive design process, the importance of the criteria that should be taken into account for global product development has revealed. According to the results of the study, it was found that design validation stages were the most important globalization criterion in automotive design process as a new study area. In the comprehensive survey of the study, no other publication has been encountered to measure or evaluate the stages in the automotive design and new product development process in other sectors, including the vehicle industry. As in every industry sector, in the automotive industry, with the new product companies provide market development or competitive advantage. The new product is the life channel of a company and in the realization of this new vehicle;the disciplines of the automotive industry are formed by a hundred years of experience.展开更多
A two stage turbocharging control system was proposed,in which the pressure regulator valve with a close-loop pressure adjusting function instead of a high speed on-off solenoid valve,is used as a driving mechanism of...A two stage turbocharging control system was proposed,in which the pressure regulator valve with a close-loop pressure adjusting function instead of a high speed on-off solenoid valve,is used as a driving mechanism of waste gate.A digital-analog（DA）conversion circuit based on pulse width modulation（PWM）generates one analog voltage signal required by the pressure regulating valve control.The principle of the DA conversion circuit was analyzed,meanwhile,the performance of the conversion circuit was improved by adopting a speed-up capacitor,which helps to increase the stability and responsiveness of the control voltage generated by the conversion circuit;the structure parameters of the circuit was optimized by simulation.After the optimization,the ripple wave of circuit output voltage was kept within16mV under the 12bit conversion accuracy,the conversion time of the circuit could be reduced to 4ms.The engine bench test show that the turbocharging boost pressure control system which adopted the circuit had a rather good stable control accuracy（the steady state within 0.8%）and dynamic response（the regulation time is less than 4s）.展开更多
文摘In this study, it is aimed to determine the ranking importance levels of the stages to be taken into consideration for new product development on a global scale in the automotive design process. New product design activity and stage-gate process differences between local automotive firms (serial production factory and stage-gate department in Turkey) and global automotive companies (serial production factory and stage-gate department in Turkey) are examined comparatively in the research area. In the automotive industry, which has been developing for a century, the question of how the local company products operating in the last sixty years have not been able to spread globally or how to develop global products is the background question of the research. For this purpose, one on one interviews were held with the managers of 3 national and 3 international automotive companies, who worked in the same region and who had previously designed a new vehicle, with design and product development departments.?According to?the data obtained by the AHP (Analytic Hierarchy Process) in the automotive design process, the importance of the criteria that should be taken into account for global product development has revealed. According to the results of the study, it was found that design validation stages were the most important globalization criterion in automotive design process as a new study area. In the comprehensive survey of the study, no other publication has been encountered to measure or evaluate the stages in the automotive design and new product development process in other sectors, including the vehicle industry. As in every industry sector, in the automotive industry, with the new product companies provide market development or competitive advantage. The new product is the life channel of a company and in the realization of this new vehicle;the disciplines of the automotive industry are formed by a hundred years of experience.
基金Supported by the Ministerial Level Research Project of China(D2220112901)
文摘A two stage turbocharging control system was proposed,in which the pressure regulator valve with a close-loop pressure adjusting function instead of a high speed on-off solenoid valve,is used as a driving mechanism of waste gate.A digital-analog（DA）conversion circuit based on pulse width modulation（PWM）generates one analog voltage signal required by the pressure regulating valve control.The principle of the DA conversion circuit was analyzed,meanwhile,the performance of the conversion circuit was improved by adopting a speed-up capacitor,which helps to increase the stability and responsiveness of the control voltage generated by the conversion circuit;the structure parameters of the circuit was optimized by simulation.After the optimization,the ripple wave of circuit output voltage was kept within16mV under the 12bit conversion accuracy,the conversion time of the circuit could be reduced to 4ms.The engine bench test show that the turbocharging boost pressure control system which adopted the circuit had a rather good stable control accuracy（the steady state within 0.8%）and dynamic response（the regulation time is less than 4s）.
