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AssigneeRobert Bosch GmbH
InventorsHelmut Rembold, Ernst Linder
Estimating the term…
In a hydraulic transmission in which couplings and brake bands (servo-elements) control the gear ratio and are themselves engaged and disengaged in accordance with pressure applied thereto, a motor-driven slider is provided to connect a main pressure source directly to servo-elements which will remain engaged in the newly selected gear ratio. Solenoid operated valves are interposed between the main pressure source and a second intake port of the slider. Milled channels in the slider connect this second intake port to the servo-elements to be newly engaged during the gear shift. A known gear control unit operates the valves to control the rate of change of pressure increase at the second intake port to a selected value which will limit the jolt of the vehicle to a predetermined maximum jolt.
In a transmission having gears operable in a plurality of gear ratios, a control unit (50) for furnishing gear shift control signals signifying a desired shift from a then-present gear ratio to a newly selected gear ratio, a plurality of servo-elements (16, etc.) for controlling the engagement and disengagement of said gears in accordance with pressure applied thereto, said plurality of servo-elements including at least one servo-element to be activated during said desired shift, and a pressure source (40) furnishing a pressure medium at a main pressure:
Dependencies are inferred from the claim text.