Importance

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Abstract

A hydraulic hybrid vehicle 10 includes a powersplit transmission 11, a prime mover 13, a primary hydraulic pump motor unit 42, a secondary pump motor unit 43, a high pressure hydraulic accumulator 46, a planetary gear set 71, and drive wheels 15. Under certain conditions when vehicle 10 is operated at relatively higher cruising speeds, the secondary unit 43 may be hydraulically disabled by valve 55 and/or mechanically disabled by clutch 101 and/or connected to the drive wheels 15 through high gear ratio connection 101a, 101b, 79a. Also under these conditions, primary unit 42 may be oscillated or repeatedly cycled through a power additive mode in which primary unit 42 rotates in one direction to charge accumulator 46 and a power regeneration mode in which primary unit 42 rotates in the opposite direction and receives hydraulic fluid from accumulator 46.

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First Claim