This invention relates to a feedback control device for controlling the stroke of an actuator stroke driven by a working fluid. The feedback control device for controlling the stroke correctly controls the stroke using a simple means by compensating secular changes in the flow rate control valve that controls the working fluid. The device for controlling …

Legal parties

Inventors (applicants): Yoshihiro Takei, Yasushi Yamamoto, Hiroyuki Kawanishi
Assignees (initial): Isuzu Motors Limited (Tokyo, JP)
Agents: McGinn IP Law Group, PLLC (attorney)

The application was examined by Ned Landrum (USPTO dept. 3745), Logan Kraft


  • 1. A device for controlling the stroke of a clutch actuator driven by a working …
  • 2. The device for controlling the stroke of a clutch actuator according to claim 1 , wherein …

International priority data

JP: 2008-240949 / Sep. 19, 2008 (national)

Cited documents


  • JP 11-108081 A, Apr. 1, 1999
  • JP 11-108082 A, Apr. 1, 1999
  • JP 11-173349 A, Jun. 1, 1999
  • JP 10-220258 A, Aug. 1, 1998
  • JP 6-299813 A, Oct. 1, 1994
  • Urushihata et al. US 5562071 A, Oct. 1, 1996
  • JP 8-74530 A, Mar. 1, 1996
  • Wakiya et al. US 4813335 A / 91/361, Mar. 1, 1989
  • JP 2-165304 A, Jun. 1, 1990


Brief Description of the Drawings

[ FIG. 1 ] is a circuit diagram of a device for controlling the stroke of an actuator according to the present invention. [ FIG. 2 ] is a flowchart …


Technical Field to Which the Invention Belongs

This invention relates to a device for controlling the stroke of an actuator that is driven by a fluid pressure by using a flow rate control valve like a clutch …

Mode for Carrying Out the Invention

Described below with reference to the drawings is an embodiment of when the present invention is applied to a device for controlling the stroke of a clutch for vehicles. However …

Industrial Applicability

According to the present invention as described above in detail, the feedback control device for controlling the stroke of the actuator that uses a single flow rate control valve is provided …

More details about Device for Controlling the Stroke of an Actuator

Miscellaneous patent data

Particularly claims a device for controlling the stroke of a clutch actuator driven by a working…, 10 figures depict the invention details, claims 1-2 comprise the invention scope, the grant publication date is Oct. 21, 2014, illustrated by 10 drawings, the assignee location is Tokyo (JP); its company is Isuzu Motors Limited, the agent's company - McGinn IP Law Group, PLLC, the application number is 12/998,114 (U.S.), the patent grant was extended by 855 days, the application was published on Sep. 16, 2009, similar patents are classified under Use of special fluids, e.g. liquid metal, Special adaptations of fluid-pressure systems, or control of elements therefor, to the use of such fluids, provision for altering the freewheeling action, means of differential connection of the servomotor lines, e.g. regenerative circuits, Input units, Master units, Axially seating valves, self-tightening action, Bias-type input and feedback signal means, Held closed by motive fluid pressure, Correlated throttle valve and distributor, Electrostrictive or magnetostrictive elements, e.g. piezoelectric, Follower type, Features relating to adjustment, e.g. slack adjusters, auxiliary friction members, which may be of different type, producing the self-tightening action, Special measures taken in connection with the properties of the fluid, e.g. for venting, compensating for changes of viscosity, cooling, filtering, preventing churning, Special measures for giving the operator by sense of touch the immediate response of the actuated device, categorized under Follower type as a primary classification, the assignee classification - a foreign company or corporation, the claim 1 is exemplary as chosen by the examiner, the examination was conducted by Ned Landrum (3745 USPTO department) and Logan Kraft (assistant examiner), developed by Yasushi Yamamoto et al., the published applicant's name is Kawanishi Hiroyuki, the grant publication number is 08863642, includes the following drawings: Device for Controlling the Stroke, the invention is named Device for Controlling the Stroke of an Actuator, the inventor's first name is Hiroyuki, and his last name is Kawanishi.

Invention classification information

The invention is classified under Servomotor systems incorporating electrically- operated control means, using a magnet, Control by fluid pressure, with electrical control means, Electrical input and feedback signal means (459), Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given, Control by electric or electronic means, e.g. of fluid pressure, with fluid-actuated member not rotating with a clutching member, with cylindrical slides, Follower type. The designated search classifications include Electrical input and feedback signal means (459), with cylindrical slides, Control by fluid pressure, with electrical control means.

Patent details
Publication number 08863642
Publication date Oct. 21, 2014
Kind code B2
Application number 12/998,114
Application date Sep. 16, 2009
Application type U
Application series code 12
Int. pub. country WO
Int. pub. number WO2010/032743
Int. publication Mar. 25, 2010
Int. filing country WO
Int. filing PCT/JP2009/066139
Filed internationally Sep. 16, 2009
National stage date Mar. 18, 2011
Extension term 855
National classification 91/363R
Total number of claims 2
Exemplary claims 1
Number of drawings 10
Number of figures 10
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