US 8,464,851 B2Granted

Electro-hydraulic control system for an automatic transmission

AssigneeGM Global Technology Operations LLC

InventorSteven P. Moorman

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Abstract

An electro-hydraulic control system for a multiple speed automatic motor vehicle transmission includes main and auxiliary hydraulic pumps, a line pressure regulator, a lubrication pressure regulator, a lubrication override control valve and a torque converter control valve which is controlled by a variable force solenoid (VFS). Driver commands are provided to the system through a manual logic or spool valve which functions in conjunction with a spool or logic default valve and a default solenoid. Five solenoid valves receive various flows of hydraulic fluid and supply them to hydraulic actuators that engage and disengage four friction clutches and a selectable one-way clutch.

Claims20

Dependent claims

A control system for an automatic transmission comprising, in combination,

a first hydraulic pump having an output,
a second hydraulic pump having an output,
a feed limit valve in fluid communication with said output of said second hydraulic pump and having an output,
a torque converter control valve in fluid communication with said output of said first hydraulic pump and having a control port and an output,
a torque converter apply solenoid valve having a first output in fluid communication with said control port of said torque converter control valve and a second output adapted to engage a lockup clutch of a torque converter,
a lubrication flow regulator valve having a first control port in fluid communication with said output of said first hydraulic pump and a second control port,
an oil cooler operably disposed between an outlet port of said torque converter control valve and an inlet port of said lubrication flow regulator valve,
a lubrication override enable valve having an outlet in fluid communication with said second control port of said lubrication flow regulator valve,
a manually operated spool valve having a first output enabling reverse and a second output enabling forward gears of such transmission,
a default control valve having inlet ports in fluid communication with said second output of said manually operated spool valve, a first default valve control port in fluid communication with said first output of said manually operated valve and a second default valve control port,
a default solenoid valve having an output in fluid communication with said second default valve control port of said default control valve, and
a plurality of solenoid valves, each of said solenoid valves having an inlet in fluid communication with said output of said second hydraulic pump and an output in fluid communication with a hydraulic clutch actuator.

9 more elements

An electro-hydraulic control system for an automatic transmission comprising, in combination,

a source of pressurized hydraulic fluid,
a feed limit valve in fluid communication with said source of hydraulic fluid and having an output,
a torque converter control valve in fluid communication with said source of pressurized hydraulic fluid and having a control port and an output,
a torque converter apply solenoid valve having a first output in fluid communication with said control port of said torque converter control valve and a second output adapted to engage a lockup clutch of a torque converter,
a lubrication flow regulator valve having a first control port in fluid communication with said source of hydraulic fluid and a second control port,
a lubrication override enable valve having an outlet in fluid communication with said second control port of said lubrication flow regulator valve,
a manually operated valve having a first output enabling reverse and a second output enabling forward gears of such transmission,
a default control valve having inlet ports in fluid communication with said second output of said manually operated spool valve, a first default valve control port in fluid communication with said first output of said manually operated valve and a second default valve control port,
a default solenoid valve having an output in fluid communication with said second default valve control port,
a clutch solenoid valve having an output,
a clutch enable valve having an inlet in fluid communication with said output of said clutch solenoid valve, an outlet and a control port in fluid communication with said output of said default solenoid and said output of said clutch enable valve through a three way check valve,
a double acting hydraulic piston and cylinder assembly having a first inlet in fluid communication with said output of said clutch enable valve and said first default valve control port through a three way check valve, and
a plurality of solenoid valves, each of said solenoid valves having an inlet in fluid communication with said source of hydraulic fluid and an output in fluid communication with a hydraulic clutch actuator.

10 more elements

An electro-hydraulic control system for an automatic transmission comprising, in combination,

a source of pressurized hydraulic fluid,
a feed limit valve in fluid communication with said source of hydraulic fluid and having an output,
a torque converter control valve in fluid communication with said source of hydraulic fluid and having a control port and an output,
a torque converter apply solenoid valve having a first output in fluid communication with said control port of said torque converter control valve and a second output adapted to engage a lockup clutch of a torque converter,
a lubrication flow regulator valve having a first control port in fluid communication with said source of hydraulic fluid and a second control port,
a lubrication override enable valve having an outlet in fluid communication with said second control port of said lubrication flow regulator valve,
a manually operated valve having a first output enabling reverse and a second output enabling forward gears of such transmission,
a default control valve having inlet ports in fluid communication with said second output of said manually operated spool valve, a first default valve control port in fluid communication with said first output of said manually operated valve and a second default valve control port,
a default solenoid valve having an output in fluid communication with said second control port and
a plurality of solenoid valves, each of said solenoid valves having an inlet in fluid communication with said source of hydraulic fluid and an output in fluid communication with a hydraulic clutch actuator.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/079,108Filed 4 Apr 2011
Published: US 2012/0247902 A14 Oct 2012
Granted: 18 Jun 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16H 61/0206
For gearshift control, e.g. control functions for performing shifting or generation of shift signal: layout of electro-hydraulic control circuits,…
F16H 61/0031
Supply of control fluid; Pumps therefor: using auxiliary pumps, e.g. pump driven by a different power source than the engine
F16H 61/684
Specially adapted for stepped gearings: without interruption of drive
F16H 2061/0209
Layout of electro-hydraulic control circuits, e.g. arrangement of valves: with independent solenoid valves modulating the pressure individually…

Family

US 2012/0247902 A1Pre-grant publication · published 4 Oct 2012
US 8,464,851 B2This patent

From the US filing history. Foreign family members aren’t listed.

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