Sustainable and low-cost automated greenhouse prototype with a social focus for integral formation

A low-cost automated greenhouse prototype was developed, which can be installed on rooftops, gardens, and even commercial greenhouses. This work was carried out through the use of an electronic control system, and a user interface, which allows it to be used by children, young people or adults of the Private Assistance Institution (IAP) "Manitas que hablan", contributing to the cultivation of flowers, herbs, fruits and vegetables. Surveys, experimental and observation was applied wish methodology of during the development of this project, to know the needs of the agricultural sector and to integrate the components of the systems for the automated greenhouse. The study demonstrates the feasibility of collaborative work in the development of a prototype that allows the germination of seeds and harvest of crops, and the importance of providing support to the social sector, promoting urban gardens for the integration of children and young people in this activity, achieving better health and food safety for the future.

Effect of Dynamics Control Strategy on Performance of FSEC Racing Car

The control strategy of driving system for the distributed electric drive DRe20 car of Tongji University DIAN Racing team is developed and optimized according to the competition rules of Formula Student Electric China (FSEC). The VI-grade and Matlab Simulink cosimulation experimental platform is established to study the effects of different dynamic control strategies, such as equal distribution, open-loop electronic differential and limited slip differential, on the performance of the DRe20 racing car. The simulation platform is also used to optimize the control algorithm and the setting of different parameters in the program, then the results of simulation analysis and optimization are applied to the actual car experiment, providing a lot of reference data for the adjustment of suspension system and electronic control system of the DRe20 car. The simulation and actual test results show that the limited slip differential control strategy we developed and optimized in 2020 can give full play to the design performance of the DRe20 car, and the comprehensive performances have been improved compared with those in previous years. The optimized dynamics control strategy has been applied to Tongji DIAN Racing car during the 2020 Formula Student Electric China competition, in which Tongji DIAN Racing Team wins the championship.

The Application of Disturbance-Observer-Based Control in Breath Pressure Control of Aviation Electronic Oxygen Regulator

The electronic oxygen regulator (EOR) is a new type of aviation oxygen equipment which uses electronic servo control technology to control breathing gas pressure. In this paper, the control method of EOR was studied, and the dynamic model of the aviation oxygen system was established. A disturbance-observer-based controller (DOBC) was designed by the backstepping method to achieve the goal of stable and fast breath pressure control. The sensitivity function was proposed to describe the effect of inspiratory flow on breath pressure. Combined with the frequency domain analysis of the input sensitivity function, the parameters of the DOBC were analyzed and designed. Simulation and experiment studies were carried out to examine the control performance of DOBC in respiratory resistance and positive pressurization process under the influence of noise and time delay in the discrete electronic control system, which could meet the aviation physiology requirements. The research results not only verified the rationality of the application of DOBC in the breath control of EOR, but also proved the effectiveness of the control parameters design method according to the frequency domain analysis, which provided an important design basis for the subsequent study of EOR.

Control electrónico on/off para el protocolo de temperatura usado en la criopreservación de embriones de ovino

RESUMEN Se describe un sistema de control electrónico diseñado para obtener una temperatura variable en función del tiempo, especificado en los protocolos para la preservación criogénica de embriones. Se usó el vapor del nitrógeno líquido para lograr un enfriamiento gradual y controlado, desde la temperatura del ambiente hasta -35 °C; el enfriamiento se hizo mediante un circuito electrónico de control ON/OFF, basado en un procesador digital de señales (DSP). Se hicieron pruebas del sistema para obtener la curva temperatura vs. tiempo recomendado por el protocolo de criopreservación de embriones de ovinos; los resultados obtenidos permitieron concluir que el diseño presentado permite controlar adecuadamente la temperatura al interior de la cámara dentro del rango establecido con errores menores a 1 ºC. ABSTRACT An electronic control system designed to obtain a time-varying temperature specified in the protocols for cryogenic embryo preservation is described. Liquid nitrogen vapour was used to achieve a gradual and controlled cooling from room temperature to -35 °C; the cooling was done by means of an electronic ON/OFF control circuit based on a digital signal processor (DSP). The system was tested to obtain the temperature vs. time curve recommended by the protocol for the cryopreservation of ovine embryos; the results obtained allowed the conclusion that the design presented allows the temperature inside the chamber to be adequately controlled within the established range with errors of less than 1 ºC.

Adevelopment of an Advanced Pressure Signal Acquisition Card for a Modular Turbojet Fadec System

Gas turbine engines are very important in aviation. Pressure is one of the key thermodynamic parameters which, first of all, suffers radical change within the flow passage of a gas turbine, on the other hand, there are several accessories like fuel and oil supply, in which the pressure of the working medium is essential. The measurement of this variable is therefore inevitable in data acquisition or engine control systems. The author shows the process of development of an advanced pressure signal acquisition card that fits into a modular electronic control system of a turbojet engine. The unit incorporates numerous experiences gathered with the previous generation of this module regarding power supply and integrated sensors as well. Furthermore, there are several innovations that enable a more efficient installation, data acquisition and built-in test possibilities. The most important difference is the 32-bit ARM Cortex-M0+ microcontroller which allows faster operation which allows the acquisition of more signals, including additional functions as thrust measurement, digital input/output handling and many others. The unit operation was thoroughly assessed using simulated and real operating conditions as well.

In-depth analysis of the results of an experimental study of the braking properties of a KAMAZ-740 engine with an engine brake under electronic control

As a result of an in-depth analysis, the dependences of the braking torque of a KAMAZ-740 diesel engine on the engine braking time were obtained in an analytical form, from which it was established that the initial braking torque when braking by an engine with an engine brake is 2 times higher than the initial braking torque when braking by an engine without an engine brake. But the braking torque when braking with an engine with an engine brake quickly decreases several times over time. This reduces the effectiveness of its use for service braking, therefore, to improve the engine brake, it is necessary to stabilize its braking torque due to the electronic control system. Keywords: analysis, engine braking properties, experimental research, electronic control

Recoverable autonomous sonde for subglacial lake exploration: electronic control system design

Subglacial lake exploration is of great interest to the science community. RECoverable Autonomous Sonde (RECAS) provides an exploration tool to measure and sample subglacial lake environments while the subglacial lake remains isolated from the glacier surface and atmosphere. This paper presents an electronic control system design of 200 m prototype of RECAS. The proposed electronic control system consists of a surface system, a downhole control system, and a power transfer and communication system. The downhole control system is the core element of RECAS, and is responsible for sonde status monitoring, sonde motion control, subglacial water sampling and in situ analysis. A custom RS485 temperature sensor was developed to cater for the limited size and depth requirements of the system. We adopted a humidity-based measurement to monitor for a housing leak. This condition is because standard leak detection monitoring of water conductivity may be inapplicable to pure ice in Antarctica. A water sampler control board was designed to control the samplers and monitor the on/off state. A high-definition camera system with built-in storage and self-heating ability was designed to perform the video recording in the subglacial lake. The proposed electronic control system is proven effective after a series of tests.