This Project is the exclusive solution for the mal-functioning of engines due to appreciable increase in temperature. The circuit is so efficiently designed that it senses the rising temperature and bridles it at the very precise moment. The simulations carried out on the multisim software successfully model the working of our circuit as the temperature control device. One for seeable aspect of our project is that it has the pure mechanical application.
The team has met the design challenge and experimented on different temperature readings and verified the appropriate functioning of the circuit. In multisim, the engine is not available so we took an alternative and placed LED representing the engine. This simulation gurantees the actual physical model to work successfully.
Circuit Details and Operations:
This circuit is designed to provide constant current input to the RTD so that it is slightly heated at the beginning. The RTD selected here is Hel-platinum 700 RTD. We use zener diode as aconstant voltage regulator. The input voltage of 12v is applied and zener diode with voltage 4.7 V is selected and the connected with resistance of 100 ohms so that the maximum current flows through it and not through RTD. A timer is also placed with voltage of 5 V. LED is connected to the transistor and it glows up to 5V and after that it stops working. A ceramic capacitor of 0.001mF is used to connect the control pin of the ground.
The circuit operates as the input of 12V is applied and that voltage is uniformed by zener diode. After passing through resistor, it reaches RTD and gets heat up and temperature increases. We know that resistance is directly proportional to temperature. As current is constant and resistance increases, the voltage tries to trigger the pin of the timer but fails hence the LED does not glow. In due course of time it cools down and now the LED starts to blink up and at considerable cooling the LED glows up completely. This indicates the automatic on and off of the engine against temperature.
V1 = 12V
R1 = 38ohms
D1 = 4.7V (zener diode)
R2 = 100ohms
Rx = Hel-700 platinum RTD
R3 = 10 kilo ohm
C2 = 1 microfarad
C1 = 0.01 microfarad
LED = 5V (Green LED)
IC = 555 timer
Our team sort to develop this circuit for the mechanical application. This circuit can detect the temperature and consequently turn the engine. It is also responsible for the proper functioning of the engine. With slight modifications, It can behave quite diversely as air flow detector or as an estimate of fuel consumption in a vehicle.
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