HYDRAULIC PRESSURE CONTROL DEVICE OF AUTOMATIC TRANSMISSION AND HYBRID DRIVE DEVICE HAVING SAME

• Main Authors: ISHIKAWA, KAZUNORI, NODA, KAZUYUKI, IBARAKI, RYUJI, TABATA, ATSUSHI, KASUYA, SATORU, MATSUBARA, TOORU, KOJIMA, MASAHIRO, SHIMIZU, TETSUYA
• Format: Patent
• Language: English; French; Japanese
• Published: 03.07.2008
• Subjects: ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; BLASTING; CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT; THERMAL INSULATION IN GENERAL; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

An automatic transmission comprises frictional engagement elements including a second brake (B-2) and a third clutch (C-3). The hydraulic control device (10) of the automatic transmission feeds the controlled pressure controlled by each of linear solenoid valves directly to the hydraulic servo of each of the frictional engagement elements. The hydraulic control device comprises a C3B2 relay valve (11) for selectively feeding the controlled pressure PSL4 from one linear solenoid valve (SL4) of these linear solenoid valves to the hydraulic servo (32) of the second brake (B-2) or the hydraulic servo (31) of the third clutch (C-3). Since the engagement/disengagement control of the second brake (B-2) and the engagement/disengagement control of the third clutch (C-3) can be performed by the one linear solenoid valve (SL4), the number of linear solenoid valves can be reduced. Consequently, the hydraulic control device (10) of the automatic transmission can be reduced in cost and size. Boîte de vitesse automatique comprenant des éléments d'engagement par friction comprenant eux-mêmes un second frein (B-2) et un troisième embrayage (C-3). Le dispositif de commande hydraulique (10) de la boîte automatique alimente directement le servo hydraulique de chaque élément d'engagement par friction en pression de commande régulée via chacune des électrovannes linéaires. Le dispositif de commande hydraulique comprend une soupape relais C3B2 (11) qui alimente sélectivement le servo hydraulique (32) du second frein (B-2) ou le servo hydraulique (31) du troisième embrayage (C-3) en pression régulée PSL4 par une seule (SL4) des électrovannes linéaires. Comme la commande d'engagement/désengagement du troisième embrayage (C3) peut être effectuée par la seule électrovanne linéaire (SL4), le nombre des éléctrovannes linéaires peut être réduit. Par voie de conséquence, il est possible de réduire et le coût et l'encombrement du dispositif de commande hydraulique (10).