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The identification work of the aero-engine altitude test is influenced directly by the quality and accuracy of the pressure control of the intake and exhaust. In this paper, these aspects, including: the hardware structure, the software function, the digital PID engineering improvement method of the digital pressure regulation plat, and the GE90-70 based semi-physical simulation test bed construction...
This paper considers the current domestic and international air-conditioning control and temperature characteristics of the respective physical parameters of large inertia and time delay of the characteristics of central air conditioning system on thermal engineering modeling, and the establishment of air-conditioned room and a temperature control valve circuit mathematical model. The Matlab simulation...
In order to overcome the air fuel ratio control deviation caused by the oil film vaporization speed variation during transient conditions, the Fuzzy PID control was used on the ECT, and the fuel injection revision based on the throttle valve degree and its variation during the transient condition was proposed. The simulation was accomplished on model of SQ491 gasoline engine during transient conditions...
In this paper, we report some results of a research project aimed at deriving simple, high-performance, adaptive and robust control algorithms for evaporator control by means of EEV (Electronic Expansion Valve). Control design is performed by resorting to a detailed, virtual prototyping environment described in. The proposed control scheme has two nested loops. The inner loop consists of the process...
In this paper, the structure and the characteristics of temperature control system of high altitude environmental simulation cabin are studied. In conventional approaches for temperature control of environmental simulation cabin, it is difficult to increase cooling rate and improve control precision, simultaneously. To overcome this difficulty, a lumped parameter model of low-temperature control system...
The temperature and humidity decoupling control method was presented in this paper to resolve the coupling problem between temperature and humidify in central air-conditioning variable dew point control system. By introducing absolute humidity as an intermediate variable to control the machine dew point, temperature and humidify of system can be decoupled. Two input and two output transfer function...
Air filled salvage lift bags have been a problem and danger since their invention due to uncontrolled vertical acceleration as they ascend the water column. This paper presents the design of an automated purge valve to control a lift bag's ascent. The automated purge valve monitors the changes in pressure to determine the ascent velocity of the lift bag. The resulting velocity is then evaluated by...
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