Control system for continuously variable transmission

Details Control system for continuously variable transmission Control system for continuously variable transmission

1990-08-07

1991-11-26

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74869, 192 33, B60K 4112

Patent

active

050673726

ABSTRACT:
According to a control system for a continuously variable transmission, a spool of a shift command valve is held within an overstroke range next adjacent to a normal stroke range in order to disconnect a lock-up control valve from an electromagnetically operated valve. The spool of the shift command valve is held within the overstroke range until a vehicle speed exceeds a predetermined vehicle speed value after a driver's demand for moving a motor vehicle from a standstill. Thus, the vehicle can start moving even if the electromagnetically operated valve fails to operate normally since the lock-up control valve is kept at a lock-up release position when the spool of the shift command valve is in the overstroke range.

REFERENCES:
patent: 4324156 (1982-04-01), Iwanaga et al.
patent: 4507985 (1985-04-01), Morimoto et al.
patent: 4607731 (1986-08-01), Sugano
patent: 4735112 (1988-04-01), Osanai et al.
patent: 4735113 (1988-04-01), Yamamuro et al.
patent: 4736655 (1988-04-01), Kumura et al.
patent: 4764156 (1988-08-01), Ohkumo
patent: 4803899 (1989-02-01), Kumura
patent: 4823267 (1989-04-01), Kumura
patent: 4843920 (1989-07-01), Hayasaki et al.
patent: 4862771 (1989-09-01), Kumura et al.
patent: 4930372 (1990-06-01), Sugano

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