Vehicle power transmitting system with continuously variable tra

Details Vehicle power transmitting system with continuously variable tra Vehicle power transmitting system with continuously variable tra

1990-12-17

1992-02-18

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74869, B60K 4114

Patent

active

050883550

ABSTRACT:
A power transmitting system for a motor vehicle, including a continuously variable transmission, a reversing device disposed downstream of the transmission, and a hydraulic control apparatus for controlling the transmission. The system includes a device for producing a required output pressure corresponding to a currently required acceleration value of the vehicle, a shift control valve for changing a speed ratio of the transmission, based on at least the required output pressure, such that the input shaft speed of the transmission increases with the currently required acceleration value and is higher when the shift lever is placed in a low-gear position than in a high-gear position, a device for producing a modified speed-ratio pressure which varies with the speed ratio when the speed ratio is higher than a predetermined value, and which is held constant when the speed ratio is lower than the predetermined value, and a device for applying the modified speed-ratio pressure to the shift control valve device in place of the required output pressure while the shift lever is placed in the low-gear position and when the required output pressure is lower than the modified speed-ratio pressure.

REFERENCES:
patent: 4669336 (1987-06-01), Okada et al.
patent: 4672863 (1987-06-01), Itoh et al.
patent: 4760760 (1988-08-01), Miyawaki
patent: 4831898 (1989-05-01), Miyawaki
patent: 4857034 (1989-08-01), Kuono et al.
patent: 4955260 (1990-07-01), Oshidari
patent: 4967621 (1990-11-01), Soga et al.

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