This equation means that...
Pressure and temperature are directly related... That is If we increase the pressure of a gas at constant volume the temperature will also increase...
We know that if we apply pressure, the volume will decrease(eg: consider a sponge if we press it in our hands , its size become small means volume decreased)
For a equation to be correct, the both side should be same...
So if we increase pressure the volume also decreased sufficiently so that p×v
not changes.. so now left part not changed therefore right part also not change (ie, it is at same temperature)
But,
if the volume didn't decreased sufficiently...what happens?
The p×v is now a higher value... So left part of equation increased... So the temperature increases to increase the right part...
And if temperature of a gas (fuel) inreased it will explod...
Hope helpful to you...