Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1980-09-11
1983-06-28
Myhre, Charles J.
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123341, F02D 700
Patent
active
043899919
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates generally to fuel delivery systems for combustion ignition engines and more particularly to apparatus for limiting exhaust smoke and/or the rise in engine torque.
2. Background Art
When a compression ignition engine is operating at full speed and load is applied to the engine, the engine speed decreases until a lug condition results. As the engine speed decreases, the delivery of the fuel pump increases and a greater volume of fuel is delivered to the combustion chambers. The increased fuel delivery results in an inherent increase in the output torque of the engine. In some engines, particularly turbocharged engines, the natural torque rise under such conditions is also detrimental to effective control of exhaust emissions inasmuch as excessive smoke is produced from the engine.
It has been found that excessive smoke production and damaging increases in torque can be prevented by decreasing the amount of fuel delivered to the combustion chambers as the engine speed decreases from its rated to its peak torque speed.
The task of decreasing the amount of fuel delivered as engine speed decreases typically cannot be performed by a conventional governor alone. A governor increases the delivery of fuel as engine speed decreases in order to maintain engine speed constant. This is the primary function of a governor. On some engines a fuel air ratio controller and a speed sensitive regulator are used in combination with a governor to override the governor. Such fuel air ratio controllers are disclosed in U.S. Pat. No. 3,313,283 entitled "Fuel Ratio Control Override" issued on Apr. 11, 1967 to R. H. Miller; U.S. Pat. No. 4,068,642 entitled "Fuel Ratio Control with Manually Operated Air Override" issued on Jan. 17, 1978 to J. P. Little, Jr.; and U.S. Pat. No. 4,149,507 entitled "Fuel-Air Ratio Control with Torque-Limiting Spring for Supercharged Engines" issued on Apr. 17, 1979 to J. P. Little, Jr. et al. One device for regulating a fuel air ratio controller is disclosed in U.S. Pat. No. 4,136,658, entitled "Speed Sensitive Pressure Regulator System" issued on Jan. 30, 1979 to Gates and assigned to the assignee of the present application. Other work in this field of technology includes U.S. Pat. No. 3,695,245 entitled "Fuel Supply System for Internal Combustion Engines" by Ishida issued on Oct. 3, 1972; U.S. Pat. No. 3,916,862 entitled "Torque Rise Limiting Device" by Clouse et al issued on Nov. 4, 1975; U.S. Pat. No. 3,532,082 entitled "Minimum-Maximum Governor With Midrange Regulation" by Clouse et al issued on Oct. 6, 1970; and U.S. Pat. No. 3,911,855 entitled "Torque Rise Limiting Governor" by Hammond issued on Oct. 14, 1975.
Previous devices for controlling torque rise have not always provided the desired service life. These prior controllers, for example, employ springs that can change in elasticity and/or diaphragms that can rupture due to wear.
Further, there are only a limited number of engines that actually require such a controller. Thus, there is a continuing search for a device which will satisfy these tasks and can be easily installed as an accessory to a conventional governor.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention, a rotation sensitive pressure regulator comprises an inlet, an outlet, a reciprocal valve spool, a flyweight assembly for moving the valve spool in a first direction in response to rotation thereof to communicate the inlet with the outlet, and means for urging the valve spool in an opposite, second direction in response to fluid pressure in the outlet.
In a second and more specific aspect of this invention, such means includes a pressure chamber exposed to an end of the valve spool and to the outlet and may further include an adjustable spring. In addition, the outlet is preferably adapted to be vented in response to a preselected movement of the valve spool in the second direction.
In a third aspect of the inven
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Caterpillar Tractor Co.
Moy Magdalen
Myhre Charles J.
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