Transmission shift control

Details Transmission shift control Transmission shift control

1983-06-10

1985-04-30

Krizmanich, George H.

Machine element or mechanism

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

Preselected indexed position

74877, 74869, B60K 4116

Patent

active

045136408

ABSTRACT:
A shift control for a four-speed automatic transmission has a hydraulic pump for supplying pressurized fluid to the control valves including a manual valve, a 1-2 shift valve and a throttle valve. The manual valve directs fluid to a low pressure regulator valve during automatic four-speed drive operation and to a governor valve during all forward drive operations. The 1-2 shift valve responds to throttle valve pressure and the higher of governor pressure or the output of the low pressure regulator valve during automatic four-speed drive operation, whereby on part-throttle acceleration, the 1-2 shift valve is upshifted by the output of the low pressure regulator valve so that a second gear start for the vehicle is provided. In full throttle acceleration, the transmission starts in first gear due to the increased throttle pressure bias to provide better vehicle performance.

REFERENCES:
patent: 3605525 (1971-09-01), Pierce et al.
patent: 3625090 (1971-12-01), Chana
patent: 3818783 (1974-06-01), Norris et al.
patent: 4065985 (1978-01-01), Taga
patent: 4248106 (1981-02-01), Iwanaga et al.
patent: 4369677 (1983-01-01), Lewis
patent: 4418587 (1983-12-01), Kauffman

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