Title:
TRANSMISSION CONTROL SYSTEM
Document Type and Number:
Japanese Patent JP3430352
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To control continuously changing transmission by providing a microcontroller connected to a sensor, a swash plate, a clutch and controlling the position of the swash plate and engagement/disengagement of a plurality of clutches based on a plurality of driving conditions.
SOLUTION: The speed ratio of an input shaft to an output shaft is controlled by the position of a movable swash plate. As a result, the ratio of the input speed to the output speed of a hydrostatic pressure unit is controlled by the pressure applied to a piston 52 of a servo 50. The pressure applied to the piston 52 is controlled by a proportional four-way valve 46 controlled by a microcontroller 22. The microcontroller 22 transmits control signals 58 to a three-way valve 60 corresponding to respective signal clutches 38, 40, 42 respectively. Each three-way valve 60 alternately pressurizes and exhausts a working hole connected to each of the clutches 38, 40, 42 by a hydraulic line 62. The hydraulic line 62 controls the engagement/disengagement of the clutches 38, 40, 42.
Inventors:
Frederick W. Paulman
Application Number:
JP3043896A
Publication Date:
July 28, 2003
Filing Date:
February 19, 1996
Export Citation:
Assignee:
Sauer Danfoss Incorporated
International Classes:
F16H47/02; B60W10/06; B60W30/18; F16H47/04; F16H61/46; F16H61/462; F16H59/44; (IPC1-7): F16H47/02
Domestic Patent References:
| JP1105066A | ||||
| JP1279139A | ||||
| JP54102456A | ||||
| JP4203672A | ||||
| JP5445452A | ||||
| JP6275256U |
Attorney, Agent or Firm:
Shoichi Takezawa (1 person outside)
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