Some of the latest transmissions have off-the-shelf functions to work with hybrid drivetrains, such as integrated electric pumps to generate the hydraulic pressure needed to keep them working even when the engine has been shut down. The shift response was claimed to be “below the threshold of perception,” the torque converter locked up at lower speeds, it had ‘curve mode’ to stop it shifting in corners and other features making it better to drive and as efficient as possible. It supported stop/start systems, which others hadn’t, used a new design of internal ‘dog engagement’ clutches rather than conventional clutch packs to save space, featured nested gearsets that also helped to make it shorter and, as a consequence, was also lighter than its predecessors. Designed for transverse engines, the 9HP was quite different from other automatic gearboxes. New 2022 BMW i7: 600bhp EV luxury saloon coming todayĪnother major step, also from ZF, was the introduction of the 9HP in 2013.New BMW 7 Series shows Munich's long-distance vision. ![]() New 2022 BMW 7 Series revealed as larger, more luxurious flagship.New 2022 BMW i7 is electric luxury saloon with 388-mile range.The 6HP later gave way to the 8HP, adding two more ratios and further refinements to make it even more efficient. Now, the two could work together to achieve the best fuel efficiency and emissions. It also had an integrated brain called a mechatronic module, marking the departure from the engine and gearbox working independently to the new philosophy of ‘integrated powertrain’, where the engine and gearbox talk to one another. It contained only 470 components instead of the 5HP’s 660, was shorter (thanks to new compact gearsets), weighed 13% less, accelerated faster and used 7% less fuel. It could disconnect the engine from the torque converter to save fuel, too, and had a new ‘ASIS’ adaptive shift strategy. ![]() It moved the game on a long way, with torque-converter lock-up to prevent ‘slip’ in the fluid coupling, not just in top gear but also on all forward speeds. The new gearbox was the ZF 6HP, which (no surprise) replaced the 5HP and first appeared in the fourth-generation BMW 7 Series.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |