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This paper presents detailed modeling of a novel electro-hydraulic variable valve actuator for internal combustion engines that is capable of continuously varying valve timing and dual-lift. First, nonlinear mathematical system model is developed component-by-component, considering electromagnetic, mechanical, and fluid dynamics, time delay and time-varying parameters. Second, in order to develop...
Central Venous Blood Temperature-based Adaptive Algorithms are easy-to-implement, stable, specific, and directly correspond to the overall metabolic rate of the body. Some are already in use in commercial rate-adaptive cardiac pacemakers. In this paper, numerical simulations corresponding to different situations are performed and compared.
To improve the control accuracy of piezoelectric ceramic micro-positioning, because of hysteresis for piezoelectric ceramic, modified Prandtl-Ishlinskii (P-I) hysteresis model is used and Particle Swarm Optimization algorithm is for parameter identification. Compared to classical P-I model, the biggest forecasting errors of modified P-I model is 0.4230 μ m, reducing by 46.67%. According to the principle...
This paper introduces the needs for applying model-based control techniques to vehicle powertrain and aftertreatment systems. A tutorial overview of model-based control techniques and methodologies for modern powertrain and aftertreatment systems is presented and compared with the traditional approaches. The control-oriented powertrain and aftertreatment system modeling techniques are also addressed...
Low Temperature Combustion (LTC) modes in diesel engines are characterized by enhanced homogeneity of the combustion mixture resulting from a longer ignition delay when compared to conventional diesel combustion. This is enabled by charge density and dilution control, coupled with modulation of fuel injection parameters. Charge dilution is achieved by exhaust gas recirculation (EGR), while turbocharging...
This paper introduces a method to achieve robust disturbance torque estimation in discrete time. H−/ℋ∞ theory is applied in this design to realize both accurate estimation and robustness to model uncertainty. This robust estimator is designed to estimate constant disturbance torques and disturbance torques that vary with low frequency. Since the estimation scheme is designed to be robust to model...
This research examines the pricing and capacity utilization decisions facing a BTO manufacturing firm serving customers that are segmented by different lead-times. We model the firm's operation as an M/M/1 queue and treat the demand of each segment as being linear in price. We characterize the optimal decisions and present numerical examples to validate the benefits of applying RM in BTO manufacturing...
This paper discusses the torque estimation of the spring which is internally connected between the motor shaft and the plate in an electronic throttle valve. In advanced engine control (such as EGR rate control), the throttle valve may need to be controlled in both opening and closing directions using a bidirectional driver in order to achieve more accurate and faster transient performance. The spring...
Since automated fault localization can improve the efficiency of both the testing and debugging process, it is an important technique for the development of reliable software. This paper proposes a novel fault localization approach based on multi-level similarity of execution traces, which is suitable for object-oriented software. It selects useful test cases at class level and computes code suspiciousness...
In e-commerce environments, problems of credit risks are more serious than that of the traditional commerce due to interactions between unfamiliar peers. The application of credit evaluation system for e-commerce plays a important role in mitigating credit risks. This paper proposes an improved AHP-based multi-dimension credit evaluation model based on an analysis of the drawbacks of the current model,...
In software testing and maintenance activities, the observed faults and bugs are reported in bug report managing systems (BRMS) for further analysis and repair. According to the information provided by bug reports, developers need to find out the location of these faults and fix them. However, bug locating usually involves intensively browsing back and forth through bug reports and software code and...
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