共查询到17条相似文献,搜索用时 250 毫秒
1.
2.
3.
4.
5.
6.
7.
利用三维CAD软件建立了J60型涡轮增压器涡轮级三维流道模型。利用成熟的专门针对叶轮机械的CFD软件对该涡轮级进行了计算研究,控制方程使Baldwin-Lomax模型,主要研究了涡轮级流量特性,并将计算得到数据与实验数据进行了对比。同时计算得出了涡轮级蜗壳出口流场及涡轮出口流场分布。 相似文献
8.
9.
可变涡轮增压技术及其试验研究 总被引:2,自引:0,他引:2
论述了传统增压器存在的问题,可变涡轮增压器的工作原理及常见可变涡轮增压器流通能力的控制形式。分析了双叶片整体式轴向移动可变喷嘴废气涡轮增压器的结构特点及不同转 速下的喷嘴构成原理,并对采用不同叶位置的涡轮增压器进行了发动机性能对比试验。 相似文献
10.
11.
12.
可调涡轮增压器与柴油机匹配试验研究 总被引:2,自引:0,他引:2
对J6110Z型柴油机匹配套式移动结构可调涡轮增压器进行了台架试验研究,试验中,在调节涡轮截面时没有进行相应的油量调节,而重点对柴油机各种工况下VGT-70型增压器的性能进行了研究分析。 相似文献
13.
Kyunghan Min Myoungho Sunwoo Manbae Han 《International Journal of Automotive Technology》2018,19(3):433-442
The modern diesel engines equip the exhaust gas recirculation (EGR) system to suppress the NOx emissions. In addition, the variable geometric turbocharger (VGT) system is installed to improve the drivability and fuel efficiency. These EGR and VGT systems have cross-coupled behavior because they interact with the intake and the exhaust manifolds. Furthermore, the turbocharger time delay, gas flow dynamics through EGR pipe cause the nonlinearity characteristics. These nonlinear multi-input-multi-output characteristics cause the degradation of control accuracy, especially during the transient condition. In order to improve the control accuracy, this study proposes an iterative learning control (ILC) algorithm for feedforward controller of EGR and VGT systems. The feedforward controller obtains the values about EGR and VGT actuators using the previous control results in predefined transient states. The ILC algorithm consists of a PD-type learning function and a low-pass filter. The control gains of learning function are determined to guarantee the convergence of learning results. In addition, the low-pass filter is designed for robustness against plant disturbance. The proposed control algorithm was validated by engine experiment which repeated predefined transient states. The error was reduced by 15 % according to the gain. As a result, the proposed algorithm is affordable for improving the transient control performance. 相似文献
14.
15.
《JSAE Review》2001,22(1):3-8
There is a mutual influence between the effects of controlling exhaust gas recirculation (EGR) and a variable geometry turbocharger (VGT). This paper presents an approach through the application of a control system CAD program and rapid prototyping tools to improve transient operating states by referring to a model-based exhaust recirculation and variable geometry turbocharger control algorithm. The operation model for estimating the state conditions of EGR and a VGT was built on the controller. Simulation and experimental results demonstrating the effectiveness of optimized transient control are also described. 相似文献
16.
Based on experimental data, the present study investigates the influence of turbine adjustment in a turbocharger with vaneless turbine volute on diesel combustion efficiency indices and emission characteristics. Experimental investigations were conducted on engine modes as set out by the European Stationary Cycle (ESC). The adjustment algorithms selected for the experiment under ESC modes included adjustment to achieve minimal values of specific fuel consumption (SFC), NOx, CO and particulate matter (PM). In present research only VGT adjustment was investigated, the factors like fuel injection timing and EGR were not investigated. As a result we were able to make a comparison of the engine combustion efficiency and emission indices for VGT and a common turbocharger running on ESC cycle modes. 相似文献