Automatic transmission control system

Claim 2

An automatic transmission mechanism including a drive shaft connected to an engine, a hydraulic torque converter having an input member driven by said drive shaft and an output member, an intermediate shaft connected to said output member, a driven shaft drivingly connected to drive wheels, a gear unit driven by said intermediate shaft and driving said driven shaft, friction engaging means for completing a plurality of driving connections between said intermediate shaft and drive shaft, fluid-pressureoperated hydraulic actuators for actuating said friction engaging means, and a hydraulic control system comprising pressure fluid supply means for supplying pressure fluid, throttle means for producing a throttle pressure fluid responsive to throttle opening, governor means for producing a governor pressure fluid responsive to vehicle speed, first control means including at least one pure fluid control element for deflecting the pressure fluid from said supply means in response to said throttle and governor pressure fluids to produce a first control pressure fluid, second pure fluid control means including a main nozzle connected to said supply means, control nozzle means operably connected to said first control means for deflecting the pressure fluid from said main nozzle in response to said first control pressure fluid to produce a second control pressure fluid, and output means for receiving said second control pressure fluid, and shift valve means disposed between said hydraulic actuators and said supply means and adapted to be actuated by said second control pressure fluid from said second pure fluid control means for selectively supplying the pressure fluid from said supply means to said hydraulic actuators therethrough to control the selective actuation of said friction engaging means.

Claim 3

An automatic transmission mechanism as set forth in claim 1 wherein said second pure fluid control means is of a wall attachment type and has a hysteresis characteristic.

Claim 4

An automatic transmiSsion mechanism as set forth in claim 1 wherein said pressure fluid supply means comprises at least one pump of a variable capacity type having self-regulating means for regulating delivery flow therefrom in response to self-delivered fluid pressure thereof, and return branch lines connected to a sump, whereby fluid pressure supplied from said pump is maintained at constant.

Claim 5

An automatic transmission mechanism as set forth in claim 1 wherein said pressure fluid supply means comprises at least one pump of a variable capacity type having self-regulating means for regulating delivery flow therefrom in response to pressure differential between the front and rear of an orifice which is connected to a pump delivery port in said pump, and return branch lines connected to a sump, whereby fluid flow in the control system is maintained at constant.

Claim 6

An automatic transmission mechanism including a drive shaft connected to an engine, a hydraulic torque converter having an input member driven by said drive shaft and an output member, and intermediate shaft connected to said output member, a driven shaft drivingly connected to drive wheels, a gear unit driven by said intermediate shaft and driving said driven shaft, friction engaging means for completing a plurality of driving connections between said intermediate shaft and drive shaft, fluid pressure operated hydraulic actuators for actuating said friction engaging means, and a hydraulic control system comprising pressure fluid supply means for supplying pressure fluid, throttle means for producing a throttle pressure fluid responsive to throttle opening, governor means for producing a governor pressure fluid responsive to vehicle speed, first control means including at least one pure fluid control element for deflecting the pressure fluid from said supply means in response to said throttle and governor pressure fluids to produce a first control pressure fluid, second pure fluid control means including a first main nozzle connected to said supply means, two opposite control nozzles for deflecting the pressure fluid from said first main nozzle, one of said control nozzles being connected to said governor means, the other control nozzle being connected to said supply means through a restrictor to produce a predetermined pressure fluid, and first output means for receiving a second control pressure fluid in response to said predetermined pressure fluid and said governor pressure fluid, third pure fluid control means including a second main nozzle connected to said supply means, control nozzle means operably connected to said first control means and to said first output means for deflecting the pressure fluid from said second main nozzle in response to said first and second control pressure fluids to produce a third control pressure fluid, and second output means for receiving said third control pressure fluid, and shift valve means disposed between said hydraulic actuators and said supply means and adapted to be actuated by said third control pressure fluid from said third pure fluid control means for selectively supplying the pressure fluid from said supply means to said hydraulic actuators therethrough to control the selective actuation of said friction engaging means.

Claim 7

An automatic transmission mechanism including a drive shaft connected to an engine, a hydraulic torque converter having an input member driven by said drive shaft and an output member, and intermediate shaft connected to said output member, a driven shaft drivingly connected to drive wheels, a gear unit driven by said intermediate shaft and driving said driven shaft, friction engaging means for completing a plurality of driving connections between said intermediate shaft and drive shaft, fluid pressure operated hydraulic actuators for actuating said friction engaging means, and a hydraulic control system comprising pressure fluid supply means for supplying pressure fluid, throttle means for producing a throttle pressure fluid responsive to throttle opening, governor means for producing a governor pressure fluid responsive to vehicle speed, first control means including at least one pure fluid control element for deflecting the pressure fluid from said supply means in response to said throttle and governor pressure fluids to produce a first control pressure fluid, second pure fluid control means including a first main nozzle connected to said supply means, two opposite control nozzles for deflecting the pressure fluid from said first main nozzle, one of said control nozzles being connected to said governor means, the other control nozzle being connected to said supply means through a restrictor to produce a predetermined pressure fluid, and first output means for receiving a second control pressure fluid in response to said predetermined pressure fluid and said governor pressure fluid, third pure fluid control means including a second main nozzle connected to said supply means, control nozzle means operably connected to said first control means and to said first output means for deflecting the pressure fluid from said second main nozzle in response to said first and second control pressure fluids to produce a third control pressure fluid, and second output means for receiving said third control pressure fluid, and shift valve means disposed between said hydraulic actuators and said supply means and adapted to be actuated by said third control pressure fluid from said third pure fluid control means for selectively supplying the pressure fluid from said supply means to said hydraulic actuators therethrough to control the selective actuation of said friction engaging means.

Claim 8

An automatic transmission mechanism as set forth in claim 1 wherein said hydraulic control system further comprises third pure fluid control means disposed between said shift valve means and said hydraulic actuators, said third pure fluid control means being of a vortex-type having a diode characteristic for controlling the pressure fluid from said supply means to said hydraulic actuators to delay the actuation speed of said friction engaging means, thereby to avoid shocks caused in the actuation of said friction engaging means.

Claim 9

An automatic transmission mechanism as set forth in claim 1 wherein said hydraulic control system further comprises third pure fluid control means of a vortex-type including a main nozzle connected to said supply means, a control porT operably connected to said first control means, and an output port connected to said torque converter, said control port being opposite to said output port, thereby to increase fluid pressure supplied to said torque converter to prevent the cavitation therein.

Claim 10

An automatic transmission mechanism as set forth in claim 1, wherein said hydraulic control system further comprises third pure fluid control means including a second main nozzle connected to said supply means, two opposite control nozzles connected to said throttle and governor means, respectively, and second output means for receiving a third control pressure fluid responsive to said throttle and governor pressure fluids, and fourth pure fluid control means of a vortex-type including a third main nozzle connected to said hydraulic actuators, a control port connected to said second output means of said third pure fluid control means, and an output port for exhausting pressure fluid from said hydraulic actuators to a sump therethrough, said output port being opposite to said control port, thereby to delay the actuation speed of said friction engaging means to avoid shocks caused in the actuation of said friction engaging means.

Claim 11

An automatic transmission mechanism including a drive shaft connected to an engine, a hydraulic torque converter having an input member driven by said drive shaft and an output member, an intermediate shaft connected to said output member, a driven shaft drivingly connected to drive wheels, a gear unit driven by said intermediate shaft and driving said driven shaft, friction engaging means for completing a plurality of driving connections between said intermediate shaft and drive shaft, fluid-pressure-operated hydraulic actuators for actuating said friction engaging means, and a hydraulic control system comprising pressure fluid supply means for supplying a pressure fluid, throttle means for producing a throttle pressure fluid responsive to throttle responsive to vehicle speed, first control means including at least one pure fluid control element for deflecting the pressure fluid from said supply means in response to said throttle and governor pressure fluids to produce a first and second control pressure fluid, said first control pressure fluid being produced when said throttle pressure is lower than said governor pressure, said second control pressure fluid being produced when said throttle pressure is higher than said governor pressure, second pure fluid control means including a first main nozzle connected to said supply means, first two control nozzles for deflecting the pressure fluid from said first main nozzle, one of said first control nozzles being connected to said governor means, the other first control nozzle being connected to said supply means through a first restrictor to produce a first predetermined pressure fluid, and first output means receiving a third control pressure fluid when the governor pressure is lower than said first predetermined pressure, third pure fluid control means including a second main nozzle connected to said supply means, second two control nozzles for deflecting the pressure fluid from said second main nozzle, one of said second control nozzles being connected to said governor means, the other second control nozzle being connected to said supply means through a second restrictor to produce a second predetermined pressure fluid, and second output means receiving a fourth control pressure fluid when the governor pressure is higher than said second predetermined pressure, said first predetermined pressure being lower than said second predetermined pressure, fourth pure fluid control means including a third main nozzle connected to said supply means, third two opposite control nozzles for deflecting the pressure fluid from said third main nozzle to produce a fifth control pressure fluid, one of said third control nozzles being connected to be supplied with said first and fourth control pressure fluids, the other third control nozzle being conneCted to be supplied with said second and third control pressure fluids, and third output means receiving said fifth control pressure fluid, and shift valve means disposed between said hydraulic actuators and said supply means and adapted to be actuated by said fifth control pressure fluid from said fourth pure fluid control means for selectively supplying the pressure fluid from said supply means to said hydraulic actuators therethrough to control the selective actuation of said friction engaging means.

Claim 12

An automatic transmission mechanism including a drive shaft connected to an engine, a hydraulic torque converter having an input member driven by said drive shaft and an output member, an intermediate shaft connected to said output member, a driven shaft drivingly connected to drive wheels, a gear unit driven by said intermediate shaft and driving said driven shaft, friction engaging means for completing a plurality of driving connections between said intermediate shaft and drive shaft, fluid-pressure-operated hydraulic actuators for actuating said friction engaging means, and a hydraulic control system comprising pressure fluid supply means for supplying a pressure fluid, throttle means for producing a throttle pressure fluid responsive to throttle responsive to vehicle speed, first control means including at least one pure fluid control element for deflecting the pressure fluid from said supply means in response to said throttle and governor pressure fluids to produce a first and second control pressure fluid, said first control pressure fluid being produced when said throttle pressure is lower than said governor pressure, said second control pressure fluid being produced when said throttle pressure is higher than said governor pressure, second pure fluid control means including a first main nozzle connected to said supply means, first two control nozzles for deflecting the pressure fluid from said first main nozzle, one of said first control nozzles being connected to said governor means, the other first control nozzle being connected to said supply means through a first restrictor to produce a first predetermined pressure fluid, and first output means receiving a third control pressure fluid when the governor pressure is lower than said first predetermined pressure, third pure fluid control means including a second main nozzle connected to said supply means, second two control nozzles for deflecting the pressure fluid from said second main nozzle, one of said second control nozzles being connected to said governor means, the other second control nozzle being connected to said supply means through a second restrictor to produce a second predetermined pressure fluid, and second output means receiving a fourth control pressure fluid when the governor pressure is higher than said second predetermined pressure, said first predetermined pressure being lower than said second predetermined pressure, fourth pure fluid control means including a third main nozzle connected to said supply means, third two opposite control nozzles for deflecting the pressure fluid from said third main nozzle to produce a fifth control pressure fluid, one of said third control nozzles being connected to be supplied with said first and fourth control pressure fluids, the other third control nozzle being conneCted to be supplied with said second and third control pressure fluids, and third output means receiving said fifth control pressure fluid, and shift valve means disposed between said hydraulic actuators and said supply means and adapted to be actuated by said fifth control pressure fluid from said fourth pure fluid control means for selectively supplying the pressure fluid from said supply means to said hydraulic actuators therethrough to control the selective actuation of said friction engaging means.

Claim 13

An automatic transmission mechanism including a drive shaft connected to an engine, a hydraulic torque converter having an input member driven by said drive shaft and an output member, an intermediate shaft connected to said output member, a driven shaft drivingly connected to drive wheels, a gear unit driven by said intermediate shaft and driving said driven shaft, friction engaging means for completing a plurality of driving connections between said intermediate shaft and drive shaft, fluid-pressure-operated hydraulic actuators for actuating said friction engaging means, and a hydraulic control system comprising pressure fluid supply means for supplying a pressure fluid, throttle means for producing a throttle pressure fluid responsive to throttle opening, governor means for producing a governor pressure fluid responsive to vehicle speed, first pure fluid control means including a first main nozzle connected to said supply means, first two opposite control nozzles for deflecting the pressure fluid from said first main nozzle, one of said first control nozzles being connected to said governor means and the other first control nozzle being connected to said throttle means, and first two output ports positioned to receive the pressure fluid deflected in response to throttle and governor pressure fluids, one of the first output ports receiving a first control pressure fluid which is produced when the governor pressure is higher than the throttle pressure, second pure fluid control means including a second main nozzle connected to said supply means, second two opposite control nozzles for deflecting the pressure fluid from said second main nozzle, one of the second control nozzles being connected to said supply means through a restrictor to produce a predetermined pressure fluid and the other connected to said one of the first output ports, and second two output ports receiving second and third control pressure fluids, respectively, said second control pressure fluid being produced when said first control fluid pressure is higher than the predetermined fluid pressure, said third control pressure fluid being produced when the first control fluid pressure is lower than said predetermined fluid pressure, third pure fluid control means including a third main nozzle connected to said supply means, third two opposite control nozzles for deflecting the pressure fluid from said third main nozzle, one of the third control nozzles being supplied with said second control pressure fluid and the other supplied with said third control pressure fluid, and third two output ports positioned to receive a fourth control pressure fluid produced in response to said second and third control pressure fluids, and shift valve means disposed between said hydraulic actuators and said supply means and adapted to be actuated by said fourth control pressure fluid from said third pure fluid control means for selectively supplying the pressure fluid from said supply means to said hydraulic actuators therethrough to control the selective actuation of said friction engaging means.

Claim 14

An automatic transmission mechanism including a drive shaft connected to an engine, a hydraulic torque converter having an input member driven by said drive shaft and an output member, an intermediate shaft connected to said output member, a driven shaft drivingly connected to drive wheels, a gear unit driven by said intermediate shaft and driving said driven shaft, friction engaging means for completing a plurality of driving connections between said intermediate shaft and drive shaft, fluid-pressure-operated hydraulic actuators for actuating said friction engaging means, and a hydraulic control system comprising pressure fluid supply means for supplying a pressure fluid, throttle means for producing a throttle pressure fluid responsive to throttle opening, governor means for producing a governor pressure fluid responsive to vehicle speed, first pure fluid control means including a first main nozzle connected to said supply means, first two opposite control nozzles for deflecting the pressure fluid from said first main nozzle, one of said first control nozzles being connected to said governor means and the other first control nozzle being connected to said throttle means, and first two output ports positioned to receive the pressure fluid deflected in response to throttle and governor pressure fluids, one of the first output ports receiving a first control pressure fluid which is produced when the governor pressure is higher than the throttle pressure, second pure fluid control means including a second main nozzle connected to said supply means, second two opposite control nozzles for deflecting the pressure fluid from said second main nozzle, one of the second control nozzles being connected to said supply means through a restrictor to produce a predetermined pressure fluid and the other connected to said one of the first output ports, and second two output ports receiving second and third control pressure fluids, respectively, said second control pressure fluid being produced when said first control fluid pressure is higher than the predetermined fluid pressure, said third control pressure fluid being produced when the first control fluid pressure is lower than said predetermined fluid pressure, third pure fluid control means including a third main nozzle connected to said supply means, third two opposite control nozzles for deflecting the pressure fluid from said third main nozzle, one of the third control nozzles being supplied with said second control pressure fluid and the other supplied with said third control pressure fluid, and third two output ports positioned to receive a fourth control pressure fluid produced in response to said second and third control pressure fluids, and shift valve means disposed between said hydraulic actuators and said supply means and adapted to be actuated by said fourth control pressure fluid from said third pure fluid control means for selectively supplying the pressure fluid from said supply means to said hydraulic actuators therethrough to control the selective actuation of said friction engaging means.

Claim 15

An automatic transmission mechanism as set forth in claim 9 wherein said pressure fluid supply means comprises at least one pump of a variable capacity type having self-regulating means for regulating delivery flow therefrom in response to self-delivered fluid pressure thereof, and return branch lines connected to a sump, whereby fluid pressure supplied from said pump is maintained at constant.

Claim 16

An automatic transmission mEchanism as set forth in claim 9 wherein said pressure fluid supply means comprises at least one pump of a variable capacity type having self-regulating means for regulating delivery flow therefrom in response to pressure differential between the front and rear of an orifice which is connected to a pump delivery port in said pump, and return branch lines connected to a sump, whereby fluid flow in the control system is maintained at constant.

Claim 17

An automatic transmission mechanism as set forth in claim 10 wherein said pressure fluid supply means comprises at least one pump of a variable capacity type having self-regulating means for regulating delivery flow therefrom in response to self-delivered fluid pressure thereof, and return branch lines connected to a sump, whereby fluid pressure supplied from said pump is maintained at constant.

Claim 18

An automatic transmission mechanism as set forth in claim 10 wherein said pressure fluid supply means comprises at least one pump of a variable capacity type having self-regulating means for regulating delivery flow therefrom in response to pressure differential between the front and rear of an orifice which is connected to a pump delivery port in said pump, and return branch lines connected to a sump, whereby fluid flow in the control system is maintained at constant.