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Brand: C.OEFT
OE numbers: 6HP19 A051
Product Name: Transmission Valve Body Assembly
Compatible model:
Product status: Remanufactured
Product weight: 5.581KG
Packaging size: 63X41X36cm
Product packaging: Neutral Packaging
Car Series: Germany
Car Type: for BMW
1. Compact 6AT Hydraulic System Central Control
As the "hydraulic command core" of the 6HP19 A051 transmission, the valve body precisely controls the flow direction, pressure, and flow rate of hydraulic oil through 28 sets of precision valves (4 sets fewer than the A052 version for optimized lightweight), including main pressure valves, shift valves, and lock-up control valves, realizing dynamic management of the lightweight torque converter and simplified planetary gear set:
Torque converter lock-up control: During high-speed cruising (vehicle speed > 70km/h), it controls the lock-up clutch engagement pressure (16-20MPa), with a lock-up rate of over 95%, reducing power loss of small-displacement engines and improving transmission efficiency (the measured transmission efficiency reaches 90%-92%, leading in compact 6AT);
Planetary gear set control: After receiving TCU instructions, it completes oil circuit switching within 50 milliseconds, driving the clutch/brake band to act in coordination (e.g., when shifting from 1st to 2nd gear, the time difference between the disengagement of the K1 clutch and the engagement of the K2 clutch is controlled within 0.07 seconds), realizing "power-interruption-free" transmission, ensuring stable power transmission from small-displacement engines to the wheels, and avoiding jitter caused by shifting deviations.
2. Scenario-Based Intelligent Gear Adjustment for Compact Vehicles
Combining the "flexible and efficient" driving needs of compact luxury vehicles, the valve body supports a dual-mode dynamic shifting strategy to adapt to different usage scenarios:
Eco Mode: It shifts up 200-250rpm in advance (shifting to 3rd gear at 40km/h and 6th gear at 70km/h), and the engine operates at a low speed, prioritizing fuel economy, suitable for urban commuting;
Sport Mode: It delays upshifting by 200-300rpm, maintaining the speed in the high-power range of 3,000-4,500rpm. During rapid acceleration, it supports "skip-gear downshifting" (e.g., directly shifting from 6th to 3rd gear at 70km/h), improving the power response of small-displacement engines, suitable for short-distance high-speed and overtaking scenarios;
1. Adaptation to Small-Displacement Engines, Balancing Power Response and Fuel Economy
Targeting the "maximum bearing torque of 320N·m" characteristic of the 6HP19 A051 transmission (adapted to small-displacement engines such as BMW N46 2.0L, Audi EA113 1.8T, and Volkswagen EA888 1.8T), the valve body adopts a combined design of 8 high-precision proportional solenoid valves (PWM control frequency 160Hz) and a two-stage pressure regulating valve, optimizing the "pressure control logic for low-torque working conditions". It can real-time capture changes in accelerator opening and vehicle speed under low engine load (torque < 180N·m), fine-tuning the hydraulic oil pressure with an accuracy of ±0.07MPa. Compared with the A052 version (adapted to high-torque engines), the low-load shifting response speed is increased by 30%, and the 1st-2nd gear shifting delay is controlled within 60-170 milliseconds. Through the "low-torque pre-charged oil pressure" mechanism (14-16MPa pre-charged oil pressure when shifting from 1st to 2nd gear), shifting jitter caused by insufficient power of small-displacement engines is avoided. At the same time, fuel consumption is optimized for the characteristics of small-displacement engines: during daily commuting (vehicle speed 30-60km/h), the system oil pressure is maintained at 8-10MPa, reducing hydraulic pump power consumption by 15%. The measured fuel consumption per 100km of the BMW 320i can be reduced by 0.5-0.8L, adapting to the usage needs of compact luxury vehicles that "focus on daily commuting and occasionally short-distance high-speed driving".
2. Lightweight and Durable Craftsmanship, Adapting to Multi-Scenario Use of Compact Vehicles
Considering that compact luxury vehicles often face scenarios such as "high-frequency start-stops in urban congestion, frequent steering in narrow roads, and annual mileage of 10,000-25,000km", the valve body balances "lightweight" and "durability" in materials and craftsmanship:
Core valve plate: Lightweight ADC12 die-cast aluminum alloy (18% lighter than the A052 version's A380 aluminum alloy) is used, undergoing T5 heat treatment (solution temperature 525℃ + natural aging) and surface micro-arc oxidation (oxidation layer thickness 8-10μm). Its hardness is increased to over HV750, which can withstand high-frequency oil pressure impacts of 32MPa. The deformation of the valve body under long-term use is controlled within 0.015mm, effectively resisting wear caused by repeated oil circuit scouring under low-speed conditions (main oil passage wear ≤ 0.008mm per 100,000km);
Internal spool: SUS304 stainless steel base material + polytetrafluoroethylene (PTFE) composite coating is adopted, reducing the friction coefficient by 40%. The spool movement resistance increases by no more than 15% in a -25℃ low-temperature environment, eliminating cold-start jamming (the cold-start failure rate in northern regions in winter is less than 0.2%);
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