NOVELTY - The method involves sending first piezoelectric command by a battery management system (BMS) in piezoelectric process (101). Voltage of the BMS is detected (102) for triggering high pressure contactor pull-in system. Second piezoelectric command is transmitted (104) by a motor controller for checking of complete message. High pressure of a piezoelectric system is determined (105) when carrying out a high piezoelectric operating. The second piezoelectric command is transmitted (108) by the BMS. High piezoelectric is obtained (109) by checking piezoelectric and BMS complete information.    USE - Method for controlling operation of mixing power vehicle high pressure system e.g. internal combustion engine.    ADVANTAGE - The method increases energy-saving effect, output efficiency, reliability and safety of pressure system operation with simple in structure, environment-friendly and wide range of applications, reduces labor intensity, and can increase utilization ratio of power cell so as to prevent power battery over-charging transition, ensures security and robustness of a compression system and pressure safety operation protection strategy.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a device for controlling operation of mixing power vehicle high pressure system.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart illustrating the method for controlling operation of mixing power vehicle high pressure system. (Drawing includes non-English language text)    Step for sending first piezoelectric command by a BMS in piezoelectric process (101)    Step for detecting Voltage of the BMS for triggering high pressure contactor pull-in system (102)    Step for transmitting second piezoelectric command by a motor controller for checking of complete message (103)    Step for determining high pressure of a piezoelectric system when carrying out a high piezoelectric operating (105)    Step for transmitting second piezoelectric command by the BMS (108)    Step for obtaining high piezoelectric by checking piezoelectric and BMS complete information (109)