The hydraulic valve auxiliarycontrolunit (12) keeps the exhaust valve (5) in a temporary opening position.
液压气门辅助控制单元（12）将排气气门（5）保持在暂时打开的 位置上。
2
The exhaust valve (5) is connected with a camshaft by means of a mechanical connecting mechanism (7, 8) including an hydraulic valve auxiliarycontrolunit (12).
The hydraulic valve auxiliarycontrolunit (12) can be connected and cut off by means of an additional auxiliary oil circle (3) related to a main oil circle (2) of the internal combustion engine (1).