Automatic transmission with electrical override

Details Automatic transmission with electrical override Automatic transmission with electrical override

1980-07-17

1983-11-22

Gruber, Felix D.

Boots, shoes, and leggings

74866, 74868, G05D 2900, B60K 4108, B60K 4122

Patent

active

044173075

ABSTRACT:
A fluid pressure control device for an automatic transmission of an automotive vehicle, wherein throttle pressure and governor pressure control valves produce a throttle pressure and a governor pressure from a line pressure, while several shift valves produce selectively, according to the balance of the throttle pressure and the governor pressure, pressures for actuating several friction engaging devices which provide several speed stages of the transmission. However, the shift valve which controls switching between the highest and the next to the highest speed stages is electrically controlled in its kick down throttle opening and high speed region, so that in this region the upshift and the downshift lines are both largely biased to the higher vehicle speed, depending upon a throttle opening sensor, a vehicle speed sensor, and an electrical computing device.

REFERENCES:
patent: 4308764 (1982-01-01), Kawamoto et al.
patent: 4312248 (1982-01-01), Sugimoto et al.
patent: 4314340 (1982-02-01), Miki et al.
patent: 4319501 (1982-03-01), Sugimoto

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