| 摘要 |
An improved engine retarder cycle in which the exhaust valve(s) or a dedicated retarder valve is opened during the compression stroke much earlier than in prior art retarder cycles. By opening the retarder valve earlier, the cylinder pressure is not allowed to build to as high a level as in the prior art, thereby requiring less force to push open the retarder valve. Additionally, increased retarder power is generated by increasing the charge of air that is in the cylinder during the compression stroke. This is accomplished by increasing the turbocharger boost by eliminating wasted flow in and out of the exhaust valves. The increased air mass is also created by incorporating a retarder intake event which opens the valve(s) starting at approximately mid-intake stroke and ending in the first half of the compression stroke. The result is increased retarding work and decreased mechanical loading on the engine.
|
