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Brand: C.OEFT
OE numbers: 6HP21 A065
Product Name: Transmission Valve Body Assembly
Compatible model:
Product status: Remanufactured
Product weight: 5.714KG
Packaging size: 63X41X36cm
Product packaging: Neutral Packaging
Car Series: for BMW
Car Type: Germany
1. Business-Scenario Intelligent Gear Adjustment
Combining the core needs of mid-to-large luxury vehicles for "business comfort and power reserve", the valve body supports multi-mode dynamic shifting strategies to adapt to different usage scenarios:
Comfort+ Mode: Upshifts 150-200rpm in advance (shifts to 5th gear at 70km/h and 6th gear at 110km/h), and the engine operates at a low speed of 1,800-2,200rpm. Combined with the "coasting oil control" function (when the accelerator pedal is released at a speed > 80km/h, the hydraulic pump reduces power consumption by 30%), it further reduces fuel consumption and noise, suitable for business long-distance cruising;
Sport+ Mode: Delays upshifting by 350-450rpm, maintaining the speed in the high-power range of 4,200-6,000rpm. During rapid acceleration, it supports "cross-gear downshifting" (e.g., directly shifting from 6th to 3rd gear at 100km/h) to improve high-torque power response, suitable for high-speed overtaking and short-distance power needs;
Manual Mode (M): The response delay is ≤ 60ms, supporting quick shift paddle operation (such as BMW "metal-textured shift paddles"). It also has "intelligent high-torque protection" — automatically upshifts when the speed exceeds 6,800rpm and automatically downshifts to 2nd gear when the vehicle speed is < 8km/h, avoiding overload damage to the upgraded planetary gear set (such as planetary carrier breakage and gear tooth breakage).
2. Dynamic Management of System Pressure and Flow
Targeting the characteristics of high-torque working conditions, through a 150Hz high-frequency pressure feedback mechanism (pressure sensor accuracy ±0.02MPa, 20% higher than the 6HP19), it real-time maintains the stability of the hydraulic system pressure (normal working range 9-42MPa), while optimizing flow distribution according to working conditions to balance "high-torque performance" and "energy-saving quietness":
High Oil Pressure Protection: When the system oil pressure > 45MPa or the clutch pressure > 38MPa, the main pressure relief valve and emergency pressure relief valve open in linkage, reducing the oil pressure to a safe range within 0.8 seconds to avoid ablation of the reinforced clutch/brake band due to excessive pressure (such as high-temperature carbonization of the brake band);
Low Oil Pressure Compensation: When the system oil pressure < 8MPa or the clutch pressure < 10MPa, the three-stage booster pump starts (response time ≤ 8 seconds) to raise the oil pressure to the normal range, preventing shifting failure and transmission slipping under high load (such as power delay during full-load startup);
1. Multi-Mode Intelligent Adaptation, Aligning with Business Driving Habits
It integrates 9 sets of environmental sensing sensors (temperature, pressure, speed, vibration, slope, humidity, and oil quality sensors) and ZF's exclusive "business-class algorithm", which can optimize working parameters according to different scenarios:
Comfort+ Mode (business commuting): Shifting pressure rises linearly (slowly from 16MPa to 22MPa), and the shifting interval is controlled within 1.2-1.6 seconds, prioritizing quietness. During high-speed cruising (120km/h), the system oil pressure drops to 8-10MPa to reduce hydraulic pump noise. The measured fuel consumption per 100km of the BMW 535i can be reduced by 0.7-1.0L;
Sport+ Mode (power output): Shifting response speed is increased to 60-150 milliseconds, and upshifting is delayed by 300-400rpm (maintaining a high-power speed range of 4,000-5,800rpm). During rapid acceleration, it completes continuous downshifting from 6th to 2nd gear within 1.0 second, shortening the 0-100km/h acceleration time by 0.4-0.6 seconds, adapting to high-speed overtaking and short-distance power needs;
Low-Temperature Start Optimization (ambient temperature < -30℃): A built-in 60W PTC dual heater (one more heater than the 6HP19) raises the oil circuit temperature to above 22℃ within 2-4 minutes, while reducing the clutch engagement pressure during cold start (initial pressure 13-15MPa) to avoid cold-state high-load wear, adapting to winter business vehicle use in alpine regions.
2. Strict High-End Testing + Luxury After-Sales Service, Ensuring Business Experience
Before leaving the factory, it must pass 22 ZF high-end quality verifications (4 more than the 6HP19), including the "2.2 Million Gear Cycle Shifting Test", "-40℃~160℃ Thermal Shock Test", "42MPa High-Pressure Tightness Test", "96-Hour Salt Spray Corrosion Test", "High-Torque Load Simulation Test (continuous operation for 80 hours under 500N·m torque)", and "Quietness Special Test (shifting noise and vibration spectrum analysis)". The unqualified rate is controlled below 0.03%, ensuring stable operation in extreme environments such as desert high temperatures (55℃), alpine low temperatures (-40℃), and high humidity and high salt (coastal business travel). An ultra-long warranty period of 36 months/220,000 kilometers (far exceeding the 6HP19 series) is provided, along with a ZF high-end maintenance manual (including 3D diagrams of valve body disassembly and assembly, TCU high-end matching procedures, and in-depth analysis of fault codes). The manual adds a "business vehicle emergency handling plan" (such as temporary response measures for abnormal oil pressure during high-load driving) to reduce the risk of business travel interruption. At the same time, "one-on-one exclusive after-sales service" (in collaboration with luxury vehicle 4S stores) is provided, with an after-sales response time of ≤ 24 hours. For remote areas, faults can be resolved through "special vehicle delivery + 4S store on-site installation and commissioning" to ensure the continuity of business travel for mid-to-large luxury vehicles.
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