Control system for alleviating shock in automatic transmission

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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74867, B60K 4118, B60K 4116

Patent

active

048074969

ABSTRACT:
An accumulator designed to alleviate a so-called N-D select shock is connected in a hydraulic control system for an automatic transmission such that it can also alleviate a 3-4 shift shock. The hydraulic control system includes a solenoid that controls a first hydraulic fluid pressure which is variable in a first pattern, a pressure modifier valve that changes the first pattern of variation of the first hydraulic fluid pressure to a second pattern and generates a second hydraulic fluid pressure variable in a second pattern, and a pressure regulator that is responsive to the second hydraulic fluid pressure to generate a third hydraulic fluid pressure that varies in response to the second hydraulic fluid pressure.

REFERENCES:
patent: 3621735 (1971-11-01), Lemieux
patent: 3709066 (1973-01-01), Burcz
patent: 3750495 (1973-08-01), Ito et al.
patent: 4274308 (1981-06-01), Iwannaga et al.
patent: 4485695 (1984-12-01), Kawamoto
patent: 4527448 (1985-07-01), Person et al.
patent: 4638689 (1987-01-01), Sakai
patent: 4660441 (1987-04-01), Young

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