The thesis describes the redesign of an electronic relay circuit due to the end of the service life of some components that are crucial for its operation. The relay's task is to control the glow plug and the solenoid valve, which together create a flame in the intake manifold of diesel engines in large delivery vehicles. This system helps to improve exhaust emissions during cold starts of the diesel engine, thereby reducing environmental pollution.
The most important component that has become unavailable is the smart power MOSFET, which is used to control the glow plug. It was difficult to find a suitable replacement for this component.
I first redrew the existing circuit from the P-CAD environment into the Altium Designer software package, after which I began searching for alternatives. I came up with two solutions, both of which I ultimately implemented. The first solution was to replace the smart MOSFET with a similar one, while the second solution was to replace the smart MOSFET with a classic N-channel MOSFET, which I upgraded with additional circuits to match the functionality of smart one.
This diploma thesis describes the process of designing, manufacturing, and testing prototype samples that will one day replace the current components in production.
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