Throttle position is changed as vehicle speed changes to keep the car at the desiredspeed level.
为了保持汽车预想的速度，在汽车速度改变时应调整气门的位置。
2
Thus every departure from the desiredspeed itself sets in motion the forces that tend to correct that departure.
因此，速度一偏离理想的水平，这种偏离就会自动启动一种力量去对偏离进行自动矫正。
3
In order to satisfy this requirement, the complex signal lines are usually used to detect the speed and position of each motor and to command the desiredspeed and position.