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US 9,897,201 B2Granted
Electro-hydraulic failure recovery control for dual clutch transmission
AssigneeAllison Transmission, Inc.
InventorBryan Hagelskamp
Life of this patent
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Abstract
A control for a multi-speed automatic vehicle transmission includes electrical and hydraulic components, such as pressure control valve systems in fluid communication with shift valves and electrohydraulic actuators. The control includes electrohydraulic features configured to enable the transmission to respond to an electrical failure whether the transmission is in neutral, a reverse range, or one of a plurality of forward ranges.
Claims15
An electro-hydraulic control for a transmission, the electro-hydraulic control comprising
- a plurality of shift valves movable between a plurality of positions, each shift valve being configured to control engagement of a torque transmitting mechanism of the transmission to enable the transmission to selectively attain a plurality of forward ranges and at least one reverse range,
- a plurality of trim valves movable between a plurality of positions, the plurality of trim valves comprising a first, a second, and a third trim valve, each one of the plurality of trim valves being in direct fluid communication with at least one of the shift valves, movement of the plurality of trim valves between the plurality of positions being uncontrolled by movement of the plurality of shift valves between the plurality of positions, and
- a normally-high solenoid valve operably coupled to each one of the plurality of trim valves, wherein (i) the number of shift valves equals the number of trim valves and the number of normally-high solenoid valves equals the number of trim valves, (ii) each normally-high solenoid valve is configured to output a first fluid pressure in response to receiving no electrical input and a second fluid pressure in response to receiving electrical input, and (iii) the first fluid pressure is greater than the second fluid pressure.
An electro-hydraulic control for a transmission, comprising
- a first plurality of trim valves each operably coupled to a normally-low solenoid valve and each being in direct fluid communication with a fluid chamber of a torque transmitting mechanism of the transmission,
- a second plurality of trim valves each operably coupled to a normally-high solenoid valve, the second plurality of trim valves being movable between a plurality of positions, wherein the second plurality of trim valves comprises a first, a second, and a third trim valve,
- a plurality of shift valves each being in fluid communication with one of the second plurality of trim valves and each being in direct fluid communication with a torque transmitting mechanism of the transmission, the plurality of shift valves being movable between a plurality of positions, and
- at least one valve operable to control at least one shift fork of the transmission,
- wherein (i) each one of the second plurality of trim valves is in direct fluid communication with at least one of the shift valves and (ii) movement of the second plurality of trim valves between the plurality of positions is uncontrolled by movement of the plurality of shift valves between the plurality of positions.
2 more elements
Dependencies are inferred from the claim text.