Servo boosted governor control for engines

A booster apparatus having a control member (23), first means (13) for applying a first force to said control member (23) to move it in a first direction, second means (14) for applying a second force to said control member (23) in opposition to said first force, and third means (15,15a) for applying a third force to said control member (23) additive to said second force to assist said second means (14) in urging said control member (23) in a second direction opposite to said first direction, the improvement comprising

• said third means (15,15a) including a reciprocal cylinder (46,46a) positioned to be subjected to said first, second, and third forces, an actuating chamber (53,53a), control means (51,51a) for continuously and automatically maintaining a predetermined and an at least substantially constant fluid pressure in said actuating chamber (53,53a) when said second means (14) is moved to a predetermined position, and means (49,49a,58) for automatically deactivating said third means (15,15a) in response to said first means (13) being in a selected speed range.

In a fuel control system having fuel control means (12) for controlling supply of fuel to an engine governor means (13) for automatically controlling supply of fuel to said engine by said fuel control means (12) in response to the speed of said engine, operator input means (14) for selectively applying a first force to said governor means (13) to oppose a counteracting force thereof, and booster means (15,15a) for applying a second force to said governor means (13), additive to said first force, to aid said operator input means (14) in controlling said governor means (13), the improvement comprising

• said booster means (15,15a) including reciprocal cylinder means (46,46a) for being directly subjected to said first, second, and counteracting forces, valve means (51) for continuously and automatically controlling said second force in a predetermined ratio to said first force, a fluid chamber (53,53a) defined in said cylinder means (46,46a) and terminating at an annular groove (55), said valve means (51,51a) including a ring (50,50a) mounted externally on said cylinder (46,46a) and axially opposed to said groove (55), and spring means (42) for engaging said ring (50,50a) to urge it towards a closed position over said groove (55).

A booster apparatus having a control member (23), first means (13) for applying a first force to said control member (23) to move it in a first direction, second means (14) for applying a second force to said control member (23) in opposition to said first force, and third means (15,15a) for applying a third force to said control member (23) additive to said second force to assist said second means (14) in urging said control member (23) in a second direction opposite to said first direction, the improvement comprising

• said third means (15,15a) including an actuating chamber (53,53a) control means (51,51a) for continuously maintaining a predetermined and an at least substantially constant fluid pressure in said actuating chamber (53,53a) when said second means (14) is moved to a predetermined position, and a cylinder (46,46a) reciprocally mounted on a column (40,40a), and vent means (49,49a,58) for opening to vent fluid pressure from said actuating chamber (53,53a), said vent means (49,49a,58) defined between said cylinder (46,46a) and said column (40,40a) when said cylinder (46,46a) is moved to a predetermined position on said column (40,40a).