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    • 9. 发明公开
    • Camless engines with compression release braking
    • Nockenfreie Brennkraftmaschinen mit Motorbremsvorrichtung durch Entspannung der Kompression
    • EP0886037A2
    • 1998-12-23
    • EP98114730.9
    • 1996-03-20
    • DIESEL ENGINE RETARDERS, INC.
    • The designation of the inventor has not yet been filed
    • F01L13/06
    • F01L9/02F01L13/06
    • A camless internal combustion engine has electronically or computer controlled, electrically operated hydraulic actuators (40,50) for selectively opening the engine cylinder valves (20,30). The engine is capable of operating in either positive power mode or compression release engine braking mode. The pressure of the hydraulic fluid available for application to the hydraulic actuators (40,50) is automatically adjusted from a relatively low pressure during positive power mode to a relatively high pressure during compression release engine braking mode. The stroke lengths of the engine cylinder valves (20,30) may be automatically adjusted for various engine operating conditions using feedback loops that include sensors (64) for detecting the amount of opening of each engine cylinder valve (20,30) whose stroke length is to be controlled in this manner. The shapes of the valve opening and closing trajectories as a function of engine crank angle may similarly be varied in many other respects.
    • 无凸轮内燃机具有用于选择性地打开发动机气缸阀(20,30)的电子或计算机控制的电动液压致动器(40,50)。 发动机能够以正功率模式或压缩释放发动机制动模式运行。 在压缩释放发动机制动模式期间,用于施加到液压致动器(40,50)的液压流体的压力在正功率模式期间从相对低的压力自动调节到相对高的压力。 可以使用包括用于检测每个发动机气缸阀(20,30)的打开量的传感器(64)的反馈回路来针对各种发动机工作条件自动调整发动机气缸阀门(20,30)的行程长度,其中行程长度 以这种方式进行控制。 作为发动机曲柄角的函数的阀开闭轨迹的形状可以在许多其它方面类似地变化。