| 摘要 |
PCT No. PCT/SE93/00467 Sec. 371 Date Dec. 16, 1994 Sec. 102(e) Date Dec. 16, 1994 PCT Filed May 27, 1993 PCT Pub. No. WO93/25803 PCT Pub. Date Dec. 23, 1993Methods and apparatus for engine retardation in multi-cylinder combustion engines are disclosed including a hydraulic clearance regulator for regulating the clearance in a valve controller in response to a hydraulic fluid pressure below a predetermined maximum value in which the angular position of the crankshaft of the engine at which the exhaust valve in one of the engine cylinders is operated by an extra ridge on the camshaft is determined by the clearance in the valve controller. A pressure relief valve maintains the hydraulic fluid pressure below the predetermined maximum value, and a controller gradually reduces the clearance towards zero while the hydraulic fluid pressure in the valve controller is maintained below the predetermined maximum value so that the risk of operating the exhaust valve during a cylinder pressure greater than a predetermined elevated cylinder pressure is substantially reduced. |
