SYSTEMS AND METHODS FOR CONTROLLING FRICTION ELEMENTS

• Main Authors: BANNERS, Eric Frank, CICALA, Stephen Michael, CHOI, Jaewon, NICKERSON, Kurt Howard, RIEDLE, Bradley D, LAROCHE, Cory Benson
• Format: Patent
• Language: English
• Published: 10.12.2020
• 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; BRAKES; CLUTCHES; COUPLINGS FOR TRANSMITTING ROTATION; 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; THERMAL INSULATION IN GENERAL; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

A vehicle includes a transmission having a plurality of friction elements selectively engageable to establish power flow paths within the transmission. A controller of the vehicle is programmed to, during a boost phase of a shift, command a first hydraulic boost pressure for a plurality of control loop cycles to an oncoming one of the friction elements (oncoming friction element) and subsequently command a second hydraulic boost pressure less than the first hydraulic boost pressure for only a single control loop cycle that defines an end of the boost phase to the oncoming friction element.