Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1980-03-28
1982-10-26
Lazarus, Ira S.
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123388, F02D 700
Patent
active
043556108
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Technical Field
This invention relates to a servo booster governor (hereinafter called booster) control particularly adapted for automatically reducing throttle effort during operation of an internal combustion engine.
Background Art
Fuel injection systems of the type employed in diesel engines, typically run at rate speeds of from 650 to 2400 rpm, must be precisely designed to exhibit trouble-free operation over an extended period of time. Such systems include a throttle control, usually including an accelerator pedal, for increasing the power of the engine at the will of the operator. The accelerator pedal is connected through a suitable linkage to a governor control lever which functions to compress a spring and associated flyweights thus moving the governor to a higher setting. The governor spring controls actuation of another linkage, interconnecting the governor with the injection pumps of the engine, to closely control injection of fuel into the cylinders of the engine. Thus, depression of the accelerator pedal by the operator will provide him with the additional power he requires and, simultaneously, the governor will balance out at this higher setting.
One of the problems encountered with conventional fuel injection systems of this type is that when an engine is running at speeds above low idle, pedal effort increases with speed, requiring greater pedal effort by the operator to compress the governor spring to change the increased setting of the governor. This phenomenon is depicted in FIG. 6 of the drawings by the curve labeled "Standard Governor."
A solution to this problem comprises the utilization of a booster apparatus for applying an additional force to the governor spring, additive to the force applied to the spring by depression of the accelerator pedal by the operator, whereby the pedal effort is reduced. Such booster apparatus have included means for communicating air intake manifold pressure or engine lubricating oil to the governor to counteract the opposing force of the governor spring. To date, such booster apparatus have been found to be unduly complex and expensive to manufacture and do not always ensure the precise booster and governor control effort required. In addition, leakage and related problems may be occasioned to further affect the precise control of the system. Also, only one specific magnitude of boost force is normally designed into conventional systems.
DISCLOSURE OF THE INVENTION
The present invention is directed to overcoming one or more of the problems as set forth above.
In one aspect of this invention, a booster apparatus comprises a control member, first means for applying a first force to the control member to move it in a first direction, second means for applying a second force to the control member in opposition to the first force, and third means for applying a third force to the control member in opposition to the first force and additive to the second force to assist the second means in urging the control member in a second direction opposite to the first direction. An improvement in the booster apparatus comprises third means, including a reciprocal cylinder positioned to be subjected to the first, second, and third forces, control means for continuously maintaining a predetermined and at least substantially constant fluid pressure in the actuating chamber when the second means is moved to a predetermined position, and means for automatically deactivating the third means in response to the first means being in a selected speed range. Another improvement in the booster apparatus comprises vent means for opening to vent fluid pressure from the actuating chamber with the vent means being defined between the cylinder and a column on which the cylinder is reciprocally mounted.
In another aspect of this invention, the booster apparatus finds particular application to a fuel control system comprising fuel control means for controlling the supply of fuel to an engine, governor means ("first means") for automatically controlling supply of fu
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Alstrin Charles E.
King Dennis M.
Parks John H.
Caterpillar Tractor Co.
Lazarus Ira S.
Moy Magdalen
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