Derailleur pneumatics shift control system and commercial car

The utility model relates to a vehicle technical field especially relates to derailleur pneumatics shift control system and commercial car. According to the utility model discloses embodiment's the derailleur pneumatics gas accuse switching -over valve that control system adopted of shifting gears on the structure foundation of present gas accuse switching -over valve, corresponds the control mouth and sets up the 2nd gas distribution chamber and assembly in the valve body at its inside self -locking mechanism, has formed the compensation gas circuit from the air inlet of gas accuse switching-over valve, work gas port to the control mouth. This self -locking mechanism includes: the valve of portable assembly in the 2nd gas distribution chamber, have set pressure's elastic element, the 2ndgas distribution chamber can be opened to the valve under the effect of control of gases, elastic element and the gas through this work gas port airflow channel guarantees that the control of gases of control mouthful departm