配气正时 meaning in English

valve timing

The hydraulically actuating , electronically controlled variable valve actuator , the common rail hydraulical source and the electronic control unit have been designed and developed . the primary control strategies of the valve timing in different conditions have been discussed . the performance of the system has been researched deeply by experiments , from which , plenty of rules have been obtained , and the way to adjust valve timing , lift and duration has been put forward
研制了电控可变气门系统的执行器? ?电控可变气门驱动机构，设计了电控可变气门系统的液压驱动源? ?中压共轨液压源，开发了电控可变气门系统的电子控制单元，实现了在不同工况下，气门正时、气门开启持续期、气门升程柔性的电子控制，并对不同工况下配气正时的控制策略进行了初步探讨。