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AssigneeRobert Bosch GmbH
InventorsHelmut Espenschied, Uwe Kiencke, Alfred Schulz
Estimating the term…
A first and second valve respectively associated with the then-present and the newly selected gear during a gear shift operation are operated with positive overlap at the beginning of the shift process if the engine is upshifting under load or downshifting under no and at the end of the shift process if the engine is upshifting under no load or downshifting under load. During the shift process the engine speed is lowered during upshift operations and increased during downshifts. The shifting process is terminated when the engine is operating synchronously with the transmission output. It is also terminated if the engine speed decreases excessive during upshifts or increases excessively during downshift or if a predetermined maximum allowable time has elapsed from the start of the shift operation. The main pressure in the gearing is decreased during the shift operation by a factor selected in accordance with the then-present operating condition.
In a system having a transmission for transmitting torque from an engine to an output, said transmission having a plurality of gears, a plurality of valves one associated with each of said gears, gear control means (10) for furnishing a shift signal indicative of initiation of a gear shift from a then-present gear to a selected gear and a direction signal (RH) indicative of the direction of said shift, engine speed sensor means (14) coupled to said engine for furnishing an engine speed signal indicative of the speed thereof, transmission output speed sensor means (13) coupled to said transmission for furnishing a transmission speed signal indicative of the output speed of said transmission, and means (15) for furnishing a load signal indicative of the then-present load on said engine,
Dependencies are inferred from the claim text.