Regulator tlaka in temperature na osnovi mikrokrmilnika

Zupet, Martin (author), Diaci, Janez (mentor)

V delu je obravnavana zasnova in izdelava regulatorja za sistem vodne črpalke. Sistem je toplotno izoliran in je umeščen v okolje, v katerem se v zimskem času temperatura lahko spusti pod ledišče. Imamo dve procesni spremenljivki, ki ju želimo nadzorovati: tlak v sistemu in temperatura bližnje okolice sistema (temperatura znotraj toplotne izolacije). Sistem je krmiljen z uporabo mikrokrmilnika, ki skrbi za merjenje trenutnih vrednosti procesnih spremenljivk in ustrezno nadzorovanje relejev. Releji nadzorujejo delovanje elektromotorja vodne črpalke in električnega grelca (močnostnega dela sistema). Ciljne značilnosti sistema so uporabniku prijazno nastavljanje referenčnih vrednosti procesnih spremenljivk (z gumbi in LCD uporabniškim vmesnikom), zanesljivo delovanje, prehod v varen način delovanja ob zaznani napaki v sistemu. Nastavitev referenčnih vrednosti tlaka poteka diskretno (korak 100 kPa) v območju od 200 do 400 kPa. Nastavitev referenčnih vrednosti temperature poteka diskretno (korak 1 °C) v območju od 0 do 25 °C.

• Language: Slovenian
• Keywords: mikrokrmilniki, krmiljenje, merilna zaznavala, procesi, sistemi, okolica
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Zupet]
• Year: 2019
• Number of pages: XV, 35 f.
• PID: 20.500.12556/RUL-110165
• UDC: 621.65:62-55:004.451.25(043.2)
• COBISS.SI-ID: 16955931
• Publication date in RUL: 12.09.2019

Secondary language

• Language: English
• Title: Pressure and temperature regulator based on a microcontroller

Abstract

The topic of the work is the design and manufacture of a controller, used to control a water pump system. The system is heat insulated and placed into an environment in which the temperature can drop below the freezing point of water. For the system to function correctly a control of two process variables (water pressure and air temperature in the system) is mandatory. The controller consists of a microcontroller and output relays. The microcontroller measures instantaneous values of the process variables and controls of the output relays. Relays control the operation of an electric motor (used to drive the water pump) and an electric heater (used to control the temperature inside the system). Goal specifications of the system are user-friendly process parameter reference value setup (buttons and LCD user interface), reliable operation, and a safe mode operation if a fault in the system is detected. Pressure reference value adjustment is discrete (step size of 100 kPa) in the interval form 200 to 400 kPa. Temperature reference value adjustment is discrete (step size of 1 °C) in the interval form 0 to 25 °C.

• Keywords: microcontrollers, control, measuring sensors, processes, systems, environment