US1685755A

US1685755A - Control system for prime movers

Info

Publication number: US1685755A
Application number: US682212A
Authority: US
Inventors: Joseph J Ring; Schindler Carl
Original assignee: Allis Chalmers Corp
Current assignee: Allis Chalmers Corp
Priority date: 1923-12-22
Filing date: 1923-12-22
Publication date: 1928-09-25
Anticipated expiration: 1945-09-25

Description

iled Dec.

CONTROL SYSTEM FOR PRIME MOVERS ,tannin .,r. nina, or armata, ann naar. scnrunnnn., or Jvvnsr. tra, vvrsrnn'-v .SSGl-NUR% TU ALLES-GENRES MANUFACTURING UOMPMY, @lil-.MMWAU- L n Wisconsin, a eonrona'rron or nnnavvn. I

conan srsrnrr non rnnvrn irrovnns.

applicaties-nea naemna aa rara serial-in. etarra. v

'lhis invention relates to control `systems tor prime movers.

ln order to save theeapense oit. attendants, it is desirable, in installations Where this is feasible,` to provide automatic' means for starting and stopping a prime mover and controlling the same While it is running. lt is one of the objectsol this invention .to provide such'a system, the' prime mover being started either from a remote point by a single manual operation or in response to a predetermined condition. Another object of.

- the invention isto so control thev prime may be generated-thereby'.

mover inA suchv a system thatnot more than a predetermined limited amount of power A further objectl oit the inventionl is the provision ol a remote control or automatic control system iter prime movers which will be in readiness to start at substantially all times. Still another object is the provision ol an automatic control system .in vvluch the various operations will be carried out With-.V

out the imterventionl o'lan operator in the proper sequence andA with certainty. @ther objects will appearhereinatter as the description of theinventionproceeds.

The novel features of this invention vvlll appear trom the specification and the ac'- companyingdravving lorminga part thereof and disclosing one embodiment of said `invention and all these novel features aredntended to be pointed out in the claims.

The single ligure oit the dravvingis a Vdiagrammatic `representation ot the manner in which the invention may be applied to the control ol a hydraulic turbine.`

ln the drawing, a turbine 1 drlves la shaft 2 which may be connected, lor'eaample, to an electric l generator (not shovvn).` rllhe admission of Water to ythe turbine 1 isv controlled by a valve 3 mounted on a pivote.A

lt is of course to he understood that the representation of the valve 3 is diagrammatic and that the turbine may be controlled by other means such as guide vanes as is well".-

knovvn to those skilled 'in the art.' 'lt-he valve 3 may be turned by means ot a cranl; 5 mounted on the pivot l. The'cranlr 5 is here shovvn as opera le by a connectingrod 6 c oectedI to a piston rod 7 which is associl ated with, in the instance shovvn, tvvo pistone one endl ol which acts against the end 29 oit- 8, 9. These-pistons operatev in a cylinderl 10 divided into two compartmentsor cylinders 11, 12. The pistons 8, 9 With their cylinders and necessary adjuncts constitute a Servomotor for -controlling the valve 3, and this `motor is part of a governor to be hereinafter described. s

rlhe admission ol" duid under pressure (usually oil) .to the cylinders 11, 12, is controlled by a regulating valve 13 comprising la cylinder16 invvhich are movable the valve scribed to a floating lever 20 pivoted at 21 at.

the end of a spindleg22. its is usual in governors, the spindle 22 may be raised and lowered by centrifugal or speed responsive means. ln the instance shovvn it is intended that adrop in speed'vvill raise spindle 22 and a rise will lower it. As is vvell lrnovvn to those skilled in the art such speed responsiveV means may be driven in any suitable manner from the shaft of the turbineor other prime mover, and -for the sake of clearness the speed responsive means has not been shovvn.

A'dashp'otor compensating device'23 of usual or suitable 4form is connected to the other end of the floating lever 20. 'lhe compensating device may for example be ot the loi-rn shown in the patent to lEnglesson 1-,126,433,Jan.'26, 1915. The compensating device 23 is hereshown as operated by a rod 2l connected through a bellcrank lever 25' and a rod 26 to a crank 27 mounted rigidly l. on the pivot f lfso that movement of the valve ea 3 will react on the governor in the usual manner. l

'lhe connection ofthe regulating valve 13 to the Heating lever 20 includes a spring 26 a tube 31 and the other end 'against an end stop .30 on a rod `32passing through end 29.

:Roel 32 is slidable through a bloclr 33 pivot- 'ally mounted on Heating lever 26. f 'llhe end llllll 2E 'ijf i of rod 32 is provided with an adjustable nut -34v'acting against top of block 33. A spring 120 acts against the bottom of block 33 and against a collar 121 mounted on rod 32. At

itslower endtube 31 is fastened to rod 19.

Fluid under pressure is supplied to the' c linder l16 -of the regulating valve 13 tirough a pipe 35 connected to a pressure tank 36 adapted to 'contain oil under pressure. The pipe 35 is connected to the cylinder 16 substantially mid way between the orts 17, 18. Suitable drains 122, 123 may be provided above and bfow valvevmembers 14, 15 respectively, Pressure is placed upon the fluid in tank 36 by means of a pump 37,

l drawingiiuid from a sump. not shown.' The pump 3 is here shown as driven by an elec. tric motor 38, connected as will be hereinafter described. A cheek valve 39 maybe inserted between the pump 37 and tank 36 so thatwhen the pump 37 stops, the pressure to its closed position and the pawl 42 has engaged the notch .41. In this position therefore the pawl prevents the movement of the piston rod 7 in a direction which would open the yalve 3. The valve or gate l 3 may be so constructed` that-it tends to standpartiall open, so that it maybe more easily'V openeds.l The pawl 42 prevents it from opening whenv the oil pressure in tank 36'is lw. The pawl 42 may be released from the notch 41 by means of a piston 45 operatingin a cylinder 46. The piston 45 1s biased in a directiorr to engage pawl 42 7 with notch '-41 by a spring 47. Iigidly associated with crank 43 is an arm 48' which, through an elastic connection to be def "scribed, operates a control'tnger. 49 through 'a crank 50 operatively associated therewith.

y theopen Y the lnea.

The control linger 49is adapted to engage and di'sengage a collar 51 here shownas rigidly mounte fluid is admitted to cylinder 11 to close the valve 3. The im'd position of the collar 51 is indicatedbythe line'm and itspositionj 'when'theA1,'e, ;ulating valve corresponds'td position of valve 3 is indicated by' The elastic connection between the arm 48 and the control finger 49 includes arod 52,

slidably connected with the crank 50.v The rod 52 is provided with endstops 53. 54 and I on-the tube 3l of the regulat ing valve 13;i In the position shown'in thel with intermediate collars 55, 56. A spring 57-surrounds the rod 52 and is disposed between 4thezollar 55 and the crank 50. Similarly a spring 58 surrounds the rod 52 and Vis disposed between the arm 48 and the end stop 54. When the'arm 48 is moved in a clockwise direction it engages collar 56 and collar therefore presses against spring 57 to thereby move crank 50. When arm 48 is moved in a counterclockwise direction spring 58 is compressed and then force is transmitted through end stop 54, rod 52, end stop 53 to crank 50 to move the latter in a clockwise direction.

The admission ofluid under pressure to cylinder 46 is controlled by an electromagnetically operated valve 59 provided with a movable valve element 60.0perating in a c lvinder 61. .A piston-like portion 62 of va ve 60, in the position shown, covers a port 63 which is connected with a pipe 64 and through a pipe 65 to the pressure tank 36. A port 66 is here shown above the valve member 62 and this port communicates with a pipe 67 leading to cylinder 4.6il A passage 69 in valve member 60 through w lich port 66 may be placed in communication with a-pipe 70, provides for drainage when the valve 62 is in its closed position. Drainage is also provided below valve member 60 by mea-ns of a drain pipe 71. Pipe 64 may if desired be provided with a hand operated valve 72 whlch under normal vconditions would be open. The valvemember 60 is adapted' to be raised from the position shown in the drawing to its open position by means of an electromagnet or solenoid 73.

The electromagnetically operated valve 59 is controlled by a fluid pressure operated Switch` here shown as including stationary contacts 74, 75 provided respectively witlu spring fingers 76, 77. O ne .of these fingers, 6, is longer than the other for a purpose to be hereinafter set forth. The spring iingersand stationary contacts are engageable by means of a cylindrical or disk-like contact member'78, the spring fingers 76, 77 en- -gaging-the Contact 7 8 on the cylindrical sur-` ace thereof and the end of the contact 78 .being engageable with contacts 74, 75. The

contact-78 isloosely mounted between collars 79,. 80 'on a. 'rod 81. The rod 81 is pro- With an endfst0p 82. A spring 83 is disposed around the rod 81 and acts'against the end stop 82 and a cover 84 of a cylinder 85 which .acts as a closure for the. mechanism. The end stop 82 may be raised by means of a piston 86 'operating in ahole 87 l in a block. 88 constituting a cylinder therefor. Fluid under pressure is adapted to be admitted beneath the piston 86 through a .pipe 89 connected to pipe 65 and thus to the pressure tank 36. A drain 90 may be provlded to drain-oil, which has leaked. to a point above piston 86. A manually operisc.

, inerte ated valve '91 may be provided in pipe 39, this valve under normal conditions v being open.

A solenoid 73. A conductor' 95 connects the Ill just-able nut 103 whi other end ot the solenoid through either a switch 96 or a switch 97, through a switch 124 'to a bus-bar 103. '1`he switches 96, 124 may be located, vit desired, at a' point iremote from the prime mover. rllhe switch 97 is here shownas adapted to be operated to closed position by means ot a float 98. rllhe switch 97 may be responsive to the water level otthe water supply `for the turbine 1, or to any other -predetermined condition.

' A switch 99 may be inserted in conductor 95 for the purpose ot' deenergizing solenoid 7 3 under desired conditions. 'llhe Aswitch 99 may be operated to open position by a magnet 100. rlFhis magnet may be energized by 1 the closure, ci one or more relays responsive res ectively to diderent conditions, or` abnorma conditions in the prime -mover control system, as tor example, overload on. the .generator driven bythe turbineghot bearings etc.

'lhe turbine is provided with a load limiting device `which includes a crank 104 connected to acrank 105 by a lost motion connection. "llhis lost -motion connection includes, as here shown, a tubular' member 106 connected at oneend to the crank 104 and cooperating at the other end in a telescopic manner with a rod 107 pivoted to the crank:

105; The rod 107'is rovided with .an adcih will determine the amount ot motion of crank 104 i'n a-clockwise direction before the end ot' tube 106 engages the nut 103. The/crank 104 is rigidly asv sociated with the bell crank so that when the valve 3 moves in a clockwise direction,

that is, as itopens, the crank .104 will` move in a clockwise` `direction to rotate the crank 105 in like manner and therelore thecontrol linger 49 in a direction, in the instance shown. to depressthe collar 51. Ats is obvious, this will in turn, by reason oil the control errer,-

v cised on the'regulatin valve 13, limit the amountA ol opening o1 t e valve 3.

ln order toprevent leakage olf pressure trom the .tank 36 when the prime -mover is shut down, avalve 109 may be interposed in the pipe this valve 'being biased to its closed position by means ol a spring 110.4

, The valve 109 may be torced tofits open position by means ol a piston 111 operating in a cylinder 119. je'aission ot operating-duid to the cyder 119is controlled by -means ot" a 'pin valve 113 which closes a port 114connectedbya,pipe-115 to cylinder 112 when the pressure in the tank 36 lalls to' a'prcdeter run nella,N Munn l hun the valve 1131s biased to its-closed position by means ot a suitable spring 117. Fluid underpressure trom the tank 36 is admitted to 4torce the valve 113 to its open position through a pipe 113 connected to the tank 36. The cylinder 112 may be drained in a suitable manner as by a connection 116 between the pipe 115 and a passage to a drain pipe in the valve 113.

'llhe operation ot the system is as follows. Assuming the position ot the arts to be as shown in the drawing and it being desired to start up the prime mover trom a distant control station, the switch 96 isthrown tov its closed position. .lhe motor 33, being then supplied with current, operates the pump v37 and it the pressure in the tank 36 is low, brings that pressure up to a desired predetermined amount. llnasmuch as the valve 109 i\s,in Lthe drawing shown in its closed -position it is assumed that the pressure in rllhe duid pressure operated switch 73 may' be adjusted so that the. torce o t its restraining spring 33 will be overcome at a pressure ,somewhat higher than that at which valve 109 is opened. llhen this predetermined pressure has been reachedv in tank 36 the piston36 begins to rise and spring Contact linger 76 trictionally engages the contact 78 and temporarily stops the upward movement ot Contact 73. As the pressure rises still'turther the stationary 'lriction between linger 76 and .contact 73 is overcome more or less suddenly and contact 73 moves a short distance toward its closed position. 'l'his cycle oi operations is repeated until contact' 73 is fully in contact with stationary contacts 74, 7 5. 'lhe arrangement is therelore such that the contact 73 is raised by a series ot jerks so that it will bridge the contact fingers 76, 7 7 with a quick movement.

l -en contact 73 closes the circuit et solenoid 73, the valve member 60 is raised so that port 63 is placed in communication with port 66.and duid pressure is theretore admitted to cylinder 46 which raises piston 43 against the actionoi" spring "47. Crank 43 is rotated in a clockwise direction and arm 43 operates to move the control linger 49 away lromthe collar 51 so that the tube 31 y rise under the action oil spring 93. en

vthe spring 93 has brought the reatingY valvefmembers 14, 15 to their d position, on

tja

55 position shown on the drawing in which tinued releasing movement of control finger 49 permits spring 28 to move the regulating valve to its open position in which communication between the pipe 35 and pipe 17 is cut oli and communication between pipe 35 and `pipe 18 is established thereby admitting fluid to cylinder 12 and gradually moving piston 9 in a direction to open the valve 3 to thereby start the turbine. As the valve 3 moves'toward its open position the tube 10S of the load limiting device will be moved toward engagement with the adjustable nut 108 and the upward travel of the collar 51 will be limited to an eXtentdependent upon the position of the nut 108. It will be noted that even though piston 45 has been raised to a limiting position to move the control finger 49 in a counter-clockwise directionthe load limiting means may, depending upon the adjustment, return the control finger 49 in a clockwise direction a predetermined amount inasmuch as the crank will then compress spring 57, the end of crank 50having a slidable connection with rod 52. Simultaneously however, with the operation hereinbefore described the turbine will also be under speed control because as the speed rises the spindle 22 will begin' to move downwardly at a predetermined speed and the block 33 at the end of the floating lever 20 will act against spring 120, and through collar 121 actingagainst the end 29 of tube 31 will move the regulating valve -13 a predetermined amount out of its open position toward its mid position or clear to the closed position to properly control the openng of valve 3 in accordance with the spee It will/ therefore be seen that by a4r single initiating operation the turbine is automatically started and brought toits normal runningv condition under the control of its governor.A It is of course apparent that the operation would be the same if the initiating operation had been lthe closure of the float actuated switch 97.

If it is desired to stop the turbine, the

relay 100 may be energized ,to open. con

. ductor'95, or the switch 124 may be opened.

This energization of relay 100 may of course also occur by reason of some abnormal condition in the control system. Opening of conductor 95 of course deenergiz'es solenoid 73 and the Valve member 60 drops (in the instance shown, actuated by gravity) to the uid pressure is cut off from cylinder 46.

` 'Spring 47 then acts` td rotate crank 43 in a counter-clockwise direction and arm 48. acting against spring 58 causes the. stop 53 on the rod 52 to rotate the control finger .49 -in a clockwise `direction to depress the vcollar 5l so that the regulating valve. 13 will be operated to its closed position.

Fluid will then be admitted Vto eyhnder 11 .Contact with the underside of the pawl 42 ythe latter will be swung in a clockwise direction thereby moving the regulating valve 7 a predetermined amount toward its mid position. The supply of fluid under pressure to the sei'vo1notor is thereby restricted and the servo-motor moves the valve 3 at a slower rate thus preventing violent closure thereof. Further movement of the valve 3 toward closed position permits thepawl 42 to snap into the notch 41 again locking the valve in its closed position as shown in the drawing. At the same time the counterclockwise movement of pawl 42 returns the regulating valve to the position shown in which the port to pipe 17 is fully open thus causing the servo-motor to firmly seat the valve 3. The pawl42 will then snapinto the notch 41 again locking the valve 3 in its closed position as shown on the drawing.

It should be understood that it is not desired to limit the invention to the exact details shown and described, forI obvious modifications may occur to persons skilled in the art.

lIt is claimed and desired to secure by Letters Patent:

1. In combination, a prime mover, means for controlling the admission of operating fluid to said prime mover, a governor, responsive to the speed of said prime mover, for said controlling means, including a servo-motor and a regulating valve therefore, means for holding said regulating valve in a position corresponding to the closedv position of said controlling means,

Imeans for releasing said holding means including a fluid pressure operated device, an

electromagnetically operated valve for con-l .controlling said electromagnetically operated valve, and means responsive to a predetermined condition for controlling said electromagnetically operated pump and said electromagnetically operated valve.l

2. In combination, a prime mover, means lfor controlling lthe admission of operating fluid fto said prime mover, a governor, responsive to the speed of said prime mover, for said controlling means, including a servo-motor and a regulating valve therefor, means for holding said regulating valve in a position corresponding to the closed position of said controlling means, means for releasL ing said holding means including a fluid pressure operated device, an electromagnetically operated valve for controlling said fluid pressure operated device, a'souree of fluid under pressure', means responsive to said fluid under pressure for controlling fil) reame said electromagnetically operated valve, and

means responsive to a predetermined condition tor controlling said electromagnetically operated valve.

3. In combination, aprirne mover, means for controlling the admission of operating fluid to said primemover, a governor, responsive to the speed of said prime mover., for` said controlling means, including a servo-motor and a regulating valve therefor, means for holdiiig said regulating valve in a position corresponding to the closed Aposition otn said controlling means, means tor releasing said ,holding means including a fluid pressure operated device, an' electromagnetically operated valve for controlling said liuid pressure operated device, a source otlluid under pressure, means responsive to said fluid under pressure 'for controlling said electromagnetically operated valve, load limiting means including means positioned in accordance With the movement of said controlling means operatively associated with said regulating valve, and means responsive to a predetermined condition tor controlling said electromagnetically operated valve. i i

4l. ln combination, a prime mover, means tor controlling the admission of operating iiuid to said prime mover, a governor, responsive to the speed ot said prime mover, .tor said controlling means, including a servomotor and a regulating valve therefor, means tor holding said regulating valve in a position corresponding to the closed position of said controlling means, means for releasing said holding means including a tluid pressure operated device, an electromagnetically operated valve for controlling saidl duid pressure operated device, a source ot duid under pressure, means responsive to said tluid under pressure tor controlling said electromagnetically operated valve, load limiting vmeans, including means positioned in accordance with the movement oil said controlling means connected by a lost-motion connection to said holding means, and means responsive to a predetermined condition tor controlling said ele otromagnetically` operated valve. Y l

5. ln combination, a prime mover, means for controlling the admission of operating Huid. to said prime mover, a governor, responsive to the speed of said prime mover, for said controllingmeans, including a servomotor anda regulating valve therefor, means for holding said regulating valve in a position corresponding to the closed position ot said controlling means, a motive device connccted by an elastic connection to said holding means for releasing the latter, and load limiting means including means positioned in accordance with the movement ot' said con` trolling means connected by a lost motion.

connection to said holding/means.

,said controlling means including a servomotor and regulating-valve, means tor releasably holding said servo-motor and said regulating valve in a position corresponding to the closed position ot said controlling means, and means automatically responsive to a predetermined condition` for releasing esy said servo-motor and saidregulating valve.

8. ln combination, a prime mover, means tor controlling the 'admission ot operating fluid to said prime mover, a governor tor said controlling means including a servomotor and regulating valve, means tor re-f7 leasably holding said servo-motor and said regulating valve in a position corresponding to the 4closed position ot' said controlling means, a source of tluid under pressure, and means automatically responsive to a predetermined vpressure of said source and another predetermined condition for releasing said servo-motor and said regulating valve.

9. lin combination, a prime mover, means tor controlling the admission ot operating fluid to said prime mover, a governor, tor said controlling means including a servomotor, means for releasably holding said servo-motor in a`-position` corresponding to the closed position of said controlling means, asource ot fluid under pressure for supplying said servo-motor, and means operable when said fluid pressure reaches a predetermined amount tor releasing said vholding means.

l0. lln combination, a prime mover, means tor ,controlling the admission of operating fluid to said prime mover, a governor 'lor said controlling means including a servomotorand regulating'valve, means tor releasably holding said servo-motor and said regulating valve in a position corresponding to the closed position of said controlling means, a source ot fluid under pressure tor supplying said servo-motor through said regulating valve whereby said controlling means is forced to a closed position when Asaid pressure reachesak predetermined amount and means responsive to`sa1d preing means.

1l. ln combination, a prime mover, means ,for controlling the admission Vot` operating fluid to saidprime mover, said operating determined pressure, tor releasing said holdfluidl tending toopen said controlling means when the latter is in a closed position, means for operating said controlling means to closed and o en positions, means, for ref -leasably holding said operating means in closed position, and means for compensating for the pressure of said operating fluid on said controlling means before said holding meansis operated to released position.

. 12.V In combination, a prime mover, means lfor controlling the admission .of operating fluid to said prime mover, a governor for said controlling means including a servomotor and regulating valve, a source of fluid under pressure for sup lying said servomotor through` said regufating valve, means operatively associated with said regulating valve for automatically causing said gov .ernor to start said primemover from rest including an electromagnetically operated valve vfor controlling said Huid under pres- 'sure and means responsive to 'said pressure for closing a switch in the circuit of said electromagnetic valve, and means for' maintaining saidl switch closed until said pressure falls to a predetermined minimum.;

13. In combination, a Huid pressure operated motor, electromagnetically-controlled ltluid-pressureactuated controlling means therefor, a source of supply of fluid pressure, means responsive to a rise inpressu're 4of said fluid to a predetermined amount for closing a-- switch in the circuit of said electromagnetically controlled controlling means, and means for then maintaining sai switch closed until said pressure falls .to a

predetermined amount.

14. In combination, a power supplyand control system including a prime mover,

means for automatically starting ,and stopping said prime mover, including'va iuid J tive pressure operated motive device, a source of suppl of uid under pressure for said moevice, electromagnetic means for controlling the supply to said motive device,

land means responsive. to a predeterminedabnormal condition in said system for controllin said electromagneticmeans.

15. combinatioma prime mover, means for controlling the admission of operating fluid to `said prime mover, a tluid'pressure operated motive device for operating said admission, controlling means, 'a source of 'supply vof fluid under pressure other than sai operating fluid, a connection between said source` and said motive device, arcgulating valve vfor controlling the movements of saidl motive device interposed in said confnection, a shut-oft` valve interposed in said connection between said regulating valve and said source, and means responsive to tlie fluid pressure of said source for causing' said 'shut-off valve to close atI a predetermined.

minimum pressure.

16. .In combination, a prime mover, means' for controlling tlie admission of operating fluid to said prime mover, a iuid pressure operated motive device'for operating said admissio'ncontrolling means, a-source of supply of iuid under pressure, a connection between said source and said motive device, a regulating valve for controlling the movements of said motive device interposed in said connection, a shut-oil valve interposed 'in said connectionbetween said regulating valveand said source, means responsive to the Huid pressure of said source, and means operatively associated with said fluid pressure responsive means for causing said shutoff valveto close at a predetermined minimum pressure.

17. In combination, a prime mover, means for controlling the admission of operating fluid to said prime mover, a fluid pressure operated'motive device for operating said -admission controlling means,.a reservoir for luid under pressure, a pump for supplying iuid t0 and compressing the same into said reservoir, a connection between said reservoir and said motive device, and means responsive to a predetermined pressure in said reservoir for opening said connection and for interrupting said connection at a' predeterincluding said regulating valve to be elfec-,

tively actuated dependent upon a predetermined pressure of said supply.

19. 4In combination, a prime mover, means for controlling the admission of operating' iiuid to lsaid prime mover, a governor-for said 'controllin lmeans including a servo-i motor and regu ating-valve, a source'of fluid under ,pressure for supplying said servomotor through said regulating valve,y means operatively associated with said' regulating valve for automatically causing said governor to start said-prime mover from rest including an 'electromagnetically operated valve for controlling said iuid under pressure and means responsive to said pressure for closing a switch in the circuit of said electromagnetic valve. A

` 20. In combination, a prime mover, means for controlling the admission of operating4 Huid to said lprime mover, -a motive device for operating said admission controlling -m'eans,' .means for controlling the opening' and closing movement of said motive device,

HMI

nannten fmeans tor releasably holding said movement-controlling means in a position corresponding tothe `closed position ot said admission controlling means, and duid pressure operated means for releasing said holding means to tree said movement-controlling means to 'thereby start said prime mover.

21. vlln combination, a prime mover, means tor controlling the admission ot operating llnid to said .prime.mover, a motive device tor operating said admission controllingmeans," means tor controlling the opening and closing movement of said device, means tor moving said movement controlling lde-l vice to all positions in a predetermined range, means tor biasing said movement controlling means independently ot said last named means to a position corresponding to the closed position ot said admission controlling means, and Huid pressure operated means for overcoming said bias to free said movement-controlling means torl 4movement to all of its positions including 'that correspending to the open position ot said admission .controlling means `Whereby l*when duid pressure is cut od' from said-fluid pressure operated means saidbiasing means causes said movement-controlling means to llll till

tid

stop said prime mover.

22.3][1'1 a prime mover 'control system, means'tor controlling the admissionvof operating Huid to said prime mover, a servomotor and a regulating valve theretor tor operating said admission controlling means, means for moving said regulating'valve to a position to cause said servo-motor to move saidadmission controlling means4 toward vclosed position at a predetermined. speed,` and means operatively associated With the,l movable portion of said servomotor and said regulating `valve forl partially closing saidregulating valve When said admission controllin means approaches the'closed position to'tiereby reduce said speed:

23. lln a' prime mover control system, means tor controlling the admission of opy erating fluid to said prime mover, a servomotor, having a movable element with a notch therein,- and a regulating valve theretor, tor operating said admission .controlling means, a latch cooperablewvith said notch adapted toy releasably hold said element in a position correspondingl to the closed jposi- L tion of said admission controlling means,

means :tor biasing said latch toward latched position, and a connection between said latch and said regulating valve. i

2st. lin a prime mover control system, .means ttor controlling the admission of operating iluid to said prime mover, a servomotor, having a movable element including a collar having a notch, and a regulating valve therefor, for operating said admission controlling means, a latch-cooperable with said notch adapted to releasably hold said element in a position corresponding to the hlosed position ot said admission controlling means, 'means for biasings'aid latch toward latched position, and a connection betweenC said latch and 'said regulating valve, Where! by When saidservo-motormoves said admission controlling means trom an open position toward closed position said collar Will move said latch tothereby cause said regulating valve to partially close', 'further movement permitting said latch to enter `said notch to permit said regulating valve to assume the open position thereof in which the servo-motor acts to close'the admission controlling means.

25. ll'n a prime mover control system,

means tor controlling the admission ot op-l erating Huid to said prime mover, ,means tor operating said adm'ssion controlling means., means whereby said operating means l is lll' caused to apply ay predetermined torce to move said admission controlling means from an open position toward the closed position at a predetermined speed, and means for causin a predetermined. decrease in said applied torce when saidadmission controlling means approaches the fclosed position, and tor thereafter again increasing said applied torce. l

26. lin combination, a primermover, means tor controlling the admission of operating tluid to said prime mover, said operating Hud'tending `to'open said admission controlling means when the latter is in the closed position, a fluid pressure operated motive device for operating said admission controlling means to its closed lposition and adapted to hold itin said position When theprcssure of4 said pressure fluid is above a predetermined amount, and means adapted to prevent the opening ot said admission controlling means vindependent-ly of said. motive device.

`52,7. lncombination, a prime mover, means t'r lcontrolling the admission of operating duid to said prime mover, lsaid operating duid tending to open said ladmission controlling-means When said latter is in closed position, a speed governor for said prime mover including a fluid pressure operated servomotor for operating said admission controlling means to its closed position and its open position and adapted to hold it in the closed position when the pressure oi' said pressure` llo lflll I .iov

position o I-for controlling the p' rate -of the fluid in said tank under pressure and a motor for said pump, means for controlling said motor, and means for conserving the pressure in said tank upon stoppage of said motor.

29. In combination, a prime mover, means for controllingthe admission of' operating fluid to said prime mover, fluid pressure operated motive means for operating said admission controlling means, a source of fluid under pressure for supplyingv said motive means including a tank, a pump for putting the iluidin said tank iinder pressure and a motor Yfor said pump, means for controlling said motor, a shut-off valve between said source and said motive means, and means for closing said valve in .response to apredetermined reduction in pressure of said source.

30. .Incombinatiom a prime mover, means for controlling the admission of operating fluid to said prinie mover, a 'servo-motor for operating said admission controllingmeans, regulating means for said servo-motor biased towarda osition corresponding to the open position oi)- said admission controlling means,

means responsive to the speed of said primeK mover for controlling said regulating means, means for releasably holding said regulating means against saidbias in a position corresponding to the' closed position of said admission controlling means independently of control by said speed responsive means, means for removing said holding means to thereby free said regulating means for movement throughout its range to thereby permit said servo-motor to operate said admission controlling means tovvard open position, and means for controlling the rate of' acceleration of said prime mover. y y

31. In combination, a prime mover, means for controlling the admission of operating fluid to said prime mover, a servo-motor for operatingv said admission controlling means, regulating means for said servo-motor biased toward a osition corresponding to the open s said admission controlling means, means responsive to the speed of said prime mover for controlling said regulating means, means for releasably holding said regulating means against said bias in a position corresponding to the closed position of said ad.- mis'sion controlling means independently of control by said speed responsive means, lmean's for removing said holdin'gmeans to thereby free said regulating means for movement throughout jits range to thereby permit said servo-motor'to operate said admission controlling means toward open position, and means associated with said admission c'ontrolling means and said regulating means acceleration of said prime mover.

32. Inl ombination', a prime mover,- means foroontrolling the admission 'o'f operating fluid to said prime moyer, a servo-motor for operating said admission controlliiior means, a floating lever, lmeans responsive to the speed of said prime mover. for controlling said floating lever, regulating means for said servomotor having a lost motion connection to said floating lever, means for biasing said regulating means toward a position corresponding to the open position of said admission controlling means, means for releasably holding said regulating means against said bias in a position correspor` ding to the closed position of said admission controlling means independently of said floating lever, means for removing said holding means to thereby free said regulating means for movement throughout its range to thereby permitsaid servo-motor to operate said vadmission controlling means toward open position, a connection between said admission controlling means and Isaid floating lever, and a'dashpot interposed in said connection. 33. In combination, a prime mover, means for controlling the admission of operating fluid to said prime mover, a servo-motor for operating said admission controlling means, meansfor releasably holding said admission controlling means in its closed position independently of said servo-motor, regulatin means for said servo-motor biased towar a position corresponding tothe open position. of said admission controlling means, means responsive to the speed of said prime mover for controlling said regulating means, means for releasably holding said regulating means against said bias in a position corresponding to the closed position of said admission controlling means independently of coni trol by said speed responsive means, means for removing said holding means to thereby free said regulating means for movement throughout its range to thereby permit said servo-motor to operate said admission controlling meanstoward open position, and means for controlling the rate of acceleration' of said prime mover.

34;. In combination, a prime mover, means for controlling the admission of operating fluid to said prime mover, said operating fluid tending to open said admission controllin means when the latter is in the closed. position, a fluid pressure operated motive device for operating said admission controlling means to its closed osition and adapted to hold it in said position when the pressure of said pressure fluid is above al predetermined amount, a source of fluid under pressure for supplying said fluid pressure operative motive device, a valve interposed between said souree and said motive device, meansresponsive to .the predetermined pressure iof said pressure fluid for' causing closure of said valve, -and means adapted to lprevent the opening of said admission controlling means independently of .said .motive devi llo ,lag

lill

naavm db., a pe mover control syst, means lor controlling tbe assion or operating uid to said prime mover, means lor operating said admission controlling'means, means .vvbereby said operating means is caused lto produce a predetermined Alorca to move-'said admission controlling means trom an open position tovvard tbe closed position at a predetermined speed, and means lor causing a predetermined decrease in said produced. torce vvben said assion con'- trolling means approaches tbe closed position.

- tit.. ln combination, a prime mover, mns lor controlling tbe admission el operating i duid to said prime mover, a servo-motor 'lor operating said admission controlling means,

regulating means lor said servo-motor,

. means responsive to tbe speed ol said pe dll Kill

moverlor controlling said reating eans, auxiliary means vvbereby said reag means may bemoved into a position correspending to tbe closed position ol said admission controlling means independently-ol control by said speed responsive means to tbereby stop said prime mover, and means operable by lluid under pressure lor controllin said auniliary means..

d. lin combination, a primemover, means lor controlling tbe aission ol operating Huid to said prime mover, aservo-motor'vlor operating said admission controlling means, regulating means lor said seo-motor, mea responsive to tbespeed ol sd pe mover lor contro said regulating ea, auxiliary means bereby' 'said' reating means may be moved into a position corresponding to tbe l closed position oli said admission controlling means independently ol control by said speed responsive means to tbereby stop said prime mover, means operable by dond under pressure lor controlling said auailiary means, and an electro-maletically operable valve lor controllin tbe supply ol duid under pressure to said uid-pressure-operable means.. i.

38, lin combination, a rime mover, means lor controlling tbe adsion ol operating lluid to said prime mover, a servo-motor lor operating said assion controlg mea, regulating means llor saidservo-motor,

means responsive to tbe speed ol said pre c mover, a connecting means betvveen said speed dll responsive means andsaid regulating means,

lor biasin f said connecting means to a position in vv icb said speed responsive means may control said regulatin means lreely in accordance vvitb tbe speed ol said prime dit mover, and means including Ya. pressure duid operated motive device tor controlling tbe position ol said regulating means independently ol control by said speed` responsive means vvliereby said prime mover may be started or stopped s ln testimony bereol, tbe siatures ol tbe' inventors are lll l; ed bereto..

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