US 2011/0297499 A1Published application

Wet dual clutch transmission control system

AssigneeGM Global Technology Operations LLC

InventorsPhilip C. Lundberg, Bret M. Olson

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Abstract

A high efficiency hydraulic control system for a wet dual clutch transmission includes an engine driven hydraulic pump. A first pair of variable feed solenoid valves independently and mutually exclusively provide hydraulic fluid to a respective pair of main or input clutch actuators. A second pair of variable feed solenoid valves provide hydraulic fluid to a pair of inlet ports of a first spool or logic valve. The position of the spool of the first logic valve is controlled by an on-off solenoid valve. A first pair of outlet ports of the first logic valve selectively provide hydraulic fluid to a first three area piston which selects two gear or speed ratios, for example, reverse and third gear. A second pair of outlet ports of the first logic valve selectively provide hydraulic fluid to a pair of inlet ports of a second spool or logic valve. The position of the spool of the second logic valve is controlled by hydraulic fluid from the input clutch circuits. A first pair of ports of the second logic valve selectively provide hydraulic fluid to a second three area piston which selects two other gear or speed ratios, for example, first and fifth gears and a second pair of ports of the second logic valve selectively provide hydraulic fluid to a third three area piston which selects two additional gear or speed ratios, for example, second and fourth gears.

Claims15

Dependent claims

A hydraulic control system for a wet dual clutch transmission comprising, in combination,

a source of hydraulic fluid including an engine driven pump, a pressure blow off valve, a cooling pressure regulator valve and a line pressure regulator valve,
a hydraulic fluid cooler,
a first pressure control variable force solenoid valve in fluid communication with said source of fluid and having a first output provided to a first clutch actuator,
a second variable force solenoid valve in fluid communication with said source of fluid and having a second output,
a third variable force solenoid valve in fluid communication with said source of fluid and having a third output,
a fourth pressure control variable force solenoid valve in fluid communication with said source of fluid and having a fourth output provided to a second clutch actuator,
a fifth pressure control variable force solenoid valve in fluid communication with said source of fluid and having a fifth output provided to said cooling pressure regulator valve,
a sixth pressure control variable force solenoid valve in fluid communication with said source of fluid and having a sixth output provided to said line pressure regulator valve,
a first logic valve having a pair of inlets in respective fluid communication with said second output of said second variable force solenoid valve and said third output of said third variable force solenoid valve, a first outlet, a second outlet, a third outlet, a fourth outlet and a control port,
a first shift actuator having a pair of ports in fluid communication with a pair of said outlets of said first logic valve,
a second logic valve having a pair of inlets in fluid communication with another pair of said outlets of said first logic valve, two control ports, a first actuator outlet, a second actuator outlet, a third actuator outlet and a fourth actuator outlet, said control ports in respective fluid communication with said first output and said fourth output,
a second shift actuator having a pair of ports in fluid communication with a pair of said actuator outlets, and
a third shift actuator having pair of ports in fluid communication with another pair of said actuator outlets.

10 more elements

A hydraulic control system for a wet dual clutch transmission comprising, in combination,

a source of hydraulic fluid including an engine driven pump, a pump bypass valve and a pressure regulator valve,
a heat exchanger for removing hear from said hydraulic fluid,
a first pressure control variable force solenoid valve in fluid communication with said source of fluid and having a first output communicating with a first input clutch actuator,
a second variable force solenoid valve in fluid communication with said source of fluid and having a second output,
a third variable force solenoid valve in fluid communication with said source of fluid and having a third output,
a fourth pressure control variable force solenoid valve in fluid communication with said source of fluid and having a fourth output communicating with a second input clutch actuator,
a fifth pressure control variable force solenoid valve in fluid communication with said source of fluid and having a fifth output provided to said pressure regulator valve,
a first logic valve having a pair of inlets in respective fluid communication with said second output of said second variable force solenoid valve and said third output of said third variable force solenoid valve, a first outlet, a second outlet, a third outlet, a fourth outlet and a control port,
a first shift actuator having a pair of ports in fluid communication with a pair of said outlets of said first logic valve,
a second logic valve having a pair of inlets in fluid communication with another pair of said outlets of said first logic valve, two control ports, a first actuator outlet, a second actuator outlet, a third actuator outlet and a fourth actuator outlet, said control ports in respective fluid communication with said first output and said fourth output, a third inlet in fluid communication with said heat exchanger outlet and two outlets in fluid communication with said first and said second clutches.
a second shift actuator having a pair of ports in fluid communication with a pair of said actuator outlets of said second logic valve, and
a third shift actuator having pair of ports in fluid communication with another pair of said actuator outlets of said second logic valve.

9 more elements

Dependencies are inferred from the claim text.