The impeller (one) is rotated with the crankshaft and it converts the mechanical Electricity on the crankshaft into kinetic energy by Placing the fluid in motion. The control of the oil pressure during the lock-up clutch is done via two valves: the relay valve as well as sign valve. In https://torque-converter-clutch54184.atualblog.com/40528340/an-unbiased-view-of-torque-converter-clutch