How is the control rated when the speed of the vehicle is reduced to the point of lugging during upshifting?

When the speed of a vehicle is reduced to the point of lugging during upshifting, it indicates that the engine is not receiving enough power to maintain an efficient operation due to a mismatch in speed and gear selection. Lugging occurs when the engine speed drops too low for the gear engaged, which can cause excessive strain on the engine as it struggles to perform.

In this scenario, the control can be rated as "bad" because the vehicle is not performing efficiently. Proper shifting involves changing gears at optimal engine speeds to ensure smooth power delivery and to avoid damaging the engine. When the vehicle is in a state of lugging, it signifies poor control over the transmission and overall vehicle dynamics, leading to potential engine strain and reduced performance. Therefore, the rating reflects the negative consequences of lugging during upshifting, making it a clear indicator of ineffective control at that moment.