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Brand: C.OEFT
OE numbers: 6HP21 A063
Product Name: Transmission Valve Body Assembly
Compatible model:
Product status: Remanufactured
Product weight: 5.574KG
Packaging size: 63X41X36cm
Product packaging: Neutral Packaging
Car Series: Germany
Car Type: for BMW
1. Central Control of 6AT Hydraulic System
As the "hydraulic command core" of the 6HP21 transmission, the valve body precisely controls the flow direction, pressure, and flow rate of hydraulic oil through 36 sets of precision valves including built-in main pressure valves, shift valves, and lock-up control valves, realizing dynamic control of the torque converter and planetary gear set:
Torque converter lock-up control: During high-speed cruising (vehicle speed > 80km/h), it controls the lock-up clutch engagement pressure (20-25MPa), with a lock-up rate of over 98%, reducing power loss and improving transmission efficiency (measured transmission efficiency reaches 94%-96%, leading the 6AT industry);
Planetary gear set control: After receiving the TCU command, it completes oil circuit switching within 50 milliseconds and drives the clutch/brake band action (e.g., when shifting from 2nd to 3rd gear, the K2 clutch disengages while the K3 clutch engages precisely), achieving "power interruption-free" transmission. This ensures that engine power is smoothly transmitted to the wheels, avoiding power jitter caused by shifting deviations.
2. Luxury Vehicle Scenario-Based Intelligent Gear Adjustment
Combined with the driving needs of luxury vehicles, the valve body supports multi-mode dynamic shifting strategies to adapt to different usage scenarios:
Comfort Mode: Upshifts 200-300rpm in advance (shifts to 5th gear when the vehicle speed is 60km/h), and the engine maintains a low speed range of 1,800-2,200rpm, prioritizing smoothness and fuel economy;
Sport Mode: Delays upshifting by 300-400rpm, maintaining a high-power speed range of 3,500-5,000rpm. During rapid acceleration, it supports "continuous downshifting" (e.g., directly downshifting from 6th to 3rd gear at 70km/h) to improve power response;
Sport+ Mode: Turns off shift protection, allowing the engine speed to approach the redline (e.g., 6,500rpm for the BMW N52 engine), while shortening the shifting interval to less than 0.5 seconds, adapting to aggressive driving;
1.Exclusive Adaptation for Luxury 6AT Models, ZF OEM-Level Compatibility
The 6HP21 A063 transmission valve body is a core control component of ZF 6HP series transmissions, mainly adapted to luxury models such as BMW 5 Series (E60/E61), Audi A6L (C6), and Land Rover Freelander 2. It is developed in strict compliance with ZF's 052 162 technical specifications, and is fully synchronized with the transmission's torque converter (e.g., ZF 6HP21-specific torque converter) and Lepelletier planetary gear set (3 planetary rows). The tolerance of the valve plate oil passage aperture is controlled within ±0.02mm, the spool stroke accuracy reaches 0.005mm, and the interface specification is seamlessly compatible with vehicle-specific TCUs (e.g., BMW MS45.1, Audi MED17.5), supporting CAN FD high-speed data transmission (rate of 1000kbps). It can be directly installed without additional modification, effectively resolving issues such as 3rd-4th gear shifting jitter, power interruption during high-speed cruising, and oil pressure leakage caused by non-adaptive valve bodies. It is particularly suitable for replacing old valve bodies in luxury vehicles with more than 150,000 kilometers of operation. After installation, only approximately 25 minutes of TCU adaptive learning (activation via ZF-specific diagnostic equipment is required) is needed to restore the original "smooth shifting + high power response" characteristics, perfectly meeting the after-sales maintenance and original replacement needs of luxury vehicles.
2. Precise High-Torque Hydraulic Control, Adapted to Luxury Vehicle Power Performance
Targeting the "maximum bearing torque of 450N·m" characteristic of the 6HP21 transmission (adapted to engines such as BMW N52 3.0L and Audi 3.2FSI), the valve body adopts a combined design of 12 sets of high-precision proportional solenoid valves (PWM control frequency of 200Hz) and a three-stage pressure regulating valve. It can real-time capture dynamic parameters such as engine torque, vehicle speed, throttle opening, and driving mode (Comfort/Sport/Sport+), and fine-tune the hydraulic oil pressure with an accuracy of ±0.05MPa. Compared with ordinary valve bodies, the shifting response speed is increased by 32%, and the shifting delay from 2nd to 6th gear is controlled within 60-180 milliseconds, completely eliminating the "surging feeling" during low-speed (30-50km/h) shifting. At the same time, through ZF's exclusive "torque prediction logic," it pre-charges oil pressure for the next gear 0.3 seconds in advance (e.g., pre-establishing 18-22MPa pressure for the 4th gear clutch when driving in 3rd gear), achieving "gap-free" power transmission. Even under conditions of high-frequency rapid acceleration (throttle opening > 90%) and high-speed cruising (120km/h), it can maintain a "lightning-fast shifting + shock-free" texture, adapting to the dual needs of luxury vehicles for power response and driving comfort.
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