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US 4,391,165 AGranted
Kick-down shifting mechanism for automatic change-speed transmissions
AssigneeDaimler-Benz Aktiengesellschaft
InventorHermann Gaus
Life of this patent
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AssigneeDaimler-Benz Aktiengesellschaft
InventorHermann Gaus
Estimating the term…
A kick-down circuit for automatic change-speed transmissions, with a kick-down control member transmitting a kick-down control signal when an accelerator pedal is "floored" and with at least one gearshift valve for the operating pressure of a shift-actuating member participating in a shifting-over between a higher gear and a lower gear. The gearshift valve is actuatable by a control pressure dependent upon a driving speed along the lines of an "upshifting" and by a control pressure dependent upon a position of the gas pedal along of the lines of a "downshifting." Upon the occurrence of the kick-down control signal, under elevation of the control pressure dependent upon the position of the accelerator pedal, the gearshift valve may be brought into a position for the lower gear. The elevation of the control pressure acting along the lines of the "downshifting" triggered by the kick-down control signal is temporally limited independently of a position of the accelerator pedal.
A kick-down circuit for an automatic change-speed transmission, the circuit including a kick-down control means for transmitting a kick-down control signal when an accelerator pedal of a vehicle in which the transmission is installed is displaced to a predetermined position, at least one gearshift valve means including a valve body for controlling an operating pressure of a shift-actuating means which participates in a shifting between a higher gear and a lower gear, means for setting a control pressure acting upon the valve body is dependence upon a driving speed of the vehicle for shifting from a lower gear to a higher gear, and means for setting a control pressure acting upon the valve body in dependence upon a positioning of the accelerator pedal for shifting from a higher gear to a lower gear, characterized in that means are provided for elevating the control pressure dependent upon the position of the accelerator upon the occurrence of a kick-down signal, and in that means are operatively connected with the control pressure elevating means for limiting a duration of the elevated control pressure acting upon the valve body independently of the position of the accelerator pedal.
A kick-down circuit for an automatic change-speed transmission, the circuit comprising
Dependencies are inferred from the claim text.