Both solenoid valves are closed in the pressure hold cyclFluid apply pressure in the control channel is maintained at a constant ratThe CAB maintains the hold cycle until sensor inputs indicate a pressure change is necessary.

• 在压力保持周期，两个电磁阀都关闭。在该控制通路中液体作用压力维持不变。cab维持保持周期直至感知器的输入表明需要改变压力。