Diploma thesis presents development of a prototype circuit intended for the regulation of the catalyst heater according to the customer's requirements. An electronics prototype with a similar function, which was developed years ago, had to be adapted to operate at 48 V, add appropriate safety functions and upgrade it with the necessary components for communication with the vehicle's computer. Its power part also received a lot of attention in this version, as this circuit controls higher powers than the prototype from which I started. Special attention was also paid to the temperature characteristic of the circuit itself, since a lot of heat is released when operating at rated power. The printed circuit board is designed and drawn in the Altium Designer. The final implementation of the circuit will have some additional circuit sections of functional and cyber security.
The function of the regulator is to control the catalyst heater for light delivery vehicles. The heater is installed in the exhaust system of the internal combustion engine, which heats the gases and in combination with the filters, regulates the release of emissions into the atmosphere according to the EURO 7 standard. Its control is entirely carried out via CAN communication, which is taken care of by the vehicle's computer.
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