Importance

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Abstract

A five-speed parallel-shaft clutch-to-clutch shifting automatic transmission has an hydraulically responsive clutch priority valve effective to exhaust fluid pressure from lower priority clutches upon undesirable simultaneous application two or more clutches. Two clutches associated with numerically nonadjacent gear ratios are supplied fluid pressure from a single solenoid controlled fluid valve vis-a-vis a two mutually exclusive state multiplex valve. The clutch priority valve is interposed between the solenoid controlled fluid valve and the multi-plex valve thereby rendering the two clutch states associated with the single solenoid valve indistinguishable by the clutch priority valve. A fluid pressure control provides for a clutch priority valve override to prevent undesirable exhausting of the desired clutch supplied via the multi-plexed solenoid controlled fluid valve which otherwise may occur upon shifting to one of the two gear ratios corresponding to one of the two clutches supplied by the multi-plexed valve.

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First Claim