The present disclosure is directed to a method of retarding an engine. The method includes selectively retarding the engine in a first mode configured to produce a first level of retarding at a first intensity of noise by selectively opening at least one exhaust valve between ninety degrees and zero
The present disclosure is directed to a method of retarding an engine. The method includes selectively retarding the engine in a first mode configured to produce a first level of retarding at a first intensity of noise by selectively opening at least one exhaust valve between ninety degrees and zero degrees of an engine crank angle prior to top-dead-center of a compression stroke. The method also includes selectively retarding the engine in a second retarding mode configured to produce a second level of retarding at a second intensity of noise by maintaining an opening of at least one exhaust valve throughout the entire compression stroke.
대표청구항▼
What is claimed is: 1. A method of retarding an engine, comprising: selectively retarding the engine in a first mode configured to produce a first level of retarding at a first intensity of noise by selectively opening at least one exhaust valve between ninety degrees and zero degrees of an engine
What is claimed is: 1. A method of retarding an engine, comprising: selectively retarding the engine in a first mode configured to produce a first level of retarding at a first intensity of noise by selectively opening at least one exhaust valve between ninety degrees and zero degrees of an engine crank angle prior to top-dead-center of a compression stroke; determining a need for engine retarding at a lower noise intensity than said first intensity of noise; and selectively retarding the engine in a second mode based on said determination, said second mode being configured to produce a second level of retarding at a second intensity of noise by maintaining at least one exhaust valve in a open position from at least about 120 degrees of crank angle from top-dead-center to top-dead-center of the compression stroke. 2. The method of claim 1, wherein in the second mode, the at least one exhaust valve is maintained in an open position throughout the entire compression stroke. 3. The method of claim 1, further including a retarding switch selectable between at least a first position and a second position corresponding to the first mode and the second mode, respectively, the retarding switch further configured to generate a signal indicative of the selected position. 4. The method of claim 1, wherein in the second mode, the at least one exhaust valve is in a partially open position in the compression stroke and in a fully open position in an exhaust stroke of the engine. 5. The method of claim 1, wherein the selectively opening the at least one exhaust valve during the compression stroke in the first mode includes opening two exhaust valves. 6. The method of claim 1, wherein the maintaining of the at least one exhaust valve in a partially open position throughout the entire compression stroke in the second mode includes maintaining only one exhaust valve in the open position. 7. The method of claim 1, wherein the at least one exhaust valve maintained in the open position during the second mode includes a dedicated braking valve. 8. The method of claim 1, wherein selectively retarding the engine in the second mode further includes maintaining the at least one exhaust valve in the open position throughout an intake stroke and an expansion stroke. 9. The method of claim 1, wherein the selectively retarding the engine in the first mode includes opening a first exhaust valve to a first lift value and the selectively retarding the engine in the second mode includes maintaining a second exhaust valve in the open position at a second lift value, the first lift value being greater than the second lift value. 10. A method of operating a machine having an engine, comprising: selecting one of a first retarding mode and a second retarding mode based upon a signal received by a controller, said signal being indicative of an acceptable noise intensity; selectively controlling the engine in the first retarding mode by opening a first exhaust valve and a second exhaust valve between ninety degrees and zero degrees of an engine crank angle prior to top-dead-center of a compression stroke; and selectively controlling the engine in the second retarding mode by maintaining the first exhaust valve in an at least partially open position from at least about 120 degrees of crank angle from top-dead center to top-dead-center of the compression stroke. 11. The method of claim 10, wherein the second retarding mode includes maintaining the first exhaust valve in the partially open position for the entire compression stroke. 12. The method of claim 10, wherein the second retarding mode further includes maintaining the first exhaust valve in the at least partially open position for an intake stroke and an expansion stroke. 13. The method of claim 10, wherein the first exhaust valve and the second exhaust valve are fully opened during an exhaust stroke, in the second retarding mode the first exhaust valve is restrained from closing near an end of the exhaust stroke. 14. The method of claim 10, wherein the first exhaust valve is opened to a greater lift value in the compression stroke in the first retarding mode than a lift value of the first exhaust valve in the compression stroke in the second retarding mode. 15. The method of claim 10, wherein the first exhaust valve and the second exhaust valve are hydraulically actuated when opened during the compression stroke. 16. The method of claim 10, wherein the signal is indicative of a retarding switch, the retarding switch selectable by a machine operator to operate a retarder in one of the first retarding mode and the second retarding mode. 17. The method of claim 10, wherein a first noise level is generated by the first retarding mode and a second noise level is generated by the second retarding mode, the first noise level having and intensity greater than the second noise level. 18. The method of claim 10, wherein the first retarding mode provides a first level of retarding greater than a second level of retarding provided by the second retarding mode. 19. The method of claim 10, wherein the selectively controlling the engine in the second retarding mode further includes maintaining the first exhaust valve in the at least partially open position for at least one four stroke cycle. 20. A machine, comprising an engine with an engine crank and an exhaust valve configured to produce a power output; a traction system coupled with the engine and configured to propel the machine; a dual mode retarding system operable to command one of a first retarding mode and a second retarding mode, the first retarding mode including opening at least one exhaust valve between ninety degrees and zero degrees of an engine crank angle prior to top-dead-center of a compression stroke, the second retarding mode including maintaining at least one exhaust valve in an open position from at least about 120 degrees from top-dead-center to top-dead-center of the compression stroke; and a controller in communication with the dual mode retarding system and configured to: determine a retarding mode based on at least one signal, said at least one signal being indicative of a desirable noise intensity; receive at least one signal from at least one sensor; and affect operation of the determined retarding mode.
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