Fail safe for a continuously variable transmission

Details Fail safe for a continuously variable transmission Fail safe for a continuously variable transmission

1986-12-19

1989-04-25

Diehl, Dwight G.

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4112

Patent

active

048236446

ABSTRACT:
A control system for a motor vehicle provided with a continuously variable transmission. The transmission has a transmission ratio control valve having ports and a spool for controlling the transmission ratio. A throttle position sensor is provided for detecting the load on an engine and for deciding the transmission ratio in accordance with the load. Abnormality of the throttle position sensor is detected by comparing a first load signal immediately after starting of the engine with a subsequent load signal. When difference between the first load signal and the subsequent load signal is smaller than a predetermined value, a fail-safe signal is produced for maintaining the transmission ratio at a moderate value.

REFERENCES:
patent: 4126061 (1978-11-01), Fry
patent: 4393732 (1983-07-01), Suzuki et al.
patent: 4635508 (1987-01-01), Tatsumi
patent: 4660440 (1987-04-01), Matsumura et al.
patent: 4663991 (1987-05-01), Nakamura et al.

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