HYDRAULISCHES STEUERSYSTEM FUER EIN FAHRZEUG-AUTOMATIKGETRIEBE

• Main Authors: FUKATSU, HIRONARI, TOKIO/TOKYO, JP, SAKAKIBARA, SHIRO, MOROTO, SHUZO, NAGOYA, AICHI, JP, INUZUKA, TAKESHI, ANJO, AICHI, JP, IMAI, NORI, SAPPORO, HOKKAIDO, JP
• Format: Patent
• Language: German
• Published: 18.02.1993
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

A hydraulic control system for a vehicular automatic transmission includes a first servomotor, actuated by hydraulic pressure from a hydraulic pressure source, for engaging or releasing frictional engagement elements of the transmission; a second servomotor, actuated by the hydraulic pressure, for applying an engine brake; a manual valve and a shift valve, both connected between the hydraulic pressure source and the first and second servomotors, for controlling the hydraulic pressure; a cut-off valve interposed in a line extending between the manual valve and the shift valve; a solenoid valve for controlling the cut-off valve; and an electronic controller for receiving as inputs vehicular running conditions and a gear-shift mode and for outputting solenoid signals to control the shift valve and the cut-off valve responsive to the inputs. The controller outputs a solenoid signal to the cut-off valve to control communication between the manual valve and the shift valve through the line.