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US 6,659,899 B2Granted
Electrohydraulic control system for controlling gearspeed changes in partially or fully automatic transmissions of vehicles
AssigneeRENK Aktiengesellschaft
InventorHarald Naunheimer
Life of this patent
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Abstract
A control unit has a signal input from at least one sensor and a signal output for electrically actuating at least one valve in order to hydraulically activate a gear-changing element. An emergency gear change slide can switch off the electrical actuation of the valves so that hydraulic modulation can be carried out.
Claims11
An electrohydraulic control system for controlling gear speed changes in partially or fully automatic transmissions of vehicles having at least one gear changing element, said system comprising
- at least one hydraulic valve for actuating said at least one gear changing element,
- at least one sensor providing a signal input,
- a control unit which receives said signal input and provides a signal output for electrical actuation of said at least one hydraulic valve, and
- an emergency gear change slide which can switch off the electrical actuation of the at least one hydraulic valve so that the at least one valve can be controlled hydraulically.
1 more element
Dependencies are inferred from the claim text.