SEARCH FOR YOUR PRODUCT
Brand: C.OEFT
OE numbers: 7DCT450
Product Name: Transmission Valve Body Assembly
Compatible model:
Product status: Remanufactured
Product weight: 7.061KG
Packaging size: 63X41X36cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type: for Great Wall Motor
Protection of DCT Core Components and Fault Diagnosis
It is equipped with multiple VW DCT-specific protection functions, optimized for common fault points of the 7DCT450 transmission:
1.Clutch overheating protection
When detecting that the temperature of K1/K2 clutches exceeds 140℃, it automatically reduces the clutch engagement pressure (by 4-6MPa) to reduce frictional heat generation. At the same time, it triggers the TCU to issue a "transmission overheating" warning (displayed on the instrument panel) and limits the maximum vehicle speed (e.g., reduced to 90km/h).
2.Oil circuit blockage protection
When there is slight blockage in the oil circuit (flow rate drop exceeding 25%), the bypass oil circuit is opened (bypass flow: 8-12L/min) to maintain basic gear shifting functions, avoiding sudden shutdown of the DCT (e.g., sudden gear loss during high-speed driving).
3.Clutch wear warning
The clutch plate wear is monitored through the clutch position sensor (accuracy: ±0.01mm). When the wear exceeds 0.3mm, a "clutch maintenance reminder" is triggered to extend the service life of dual clutches.
4.Intelligent fault diagnosis
It can real-time monitor its own working status, convert problems such as abnormal oil pressure, spool jamming, sensor failure, and clutch engagement deviation into 16-bit fault codes (complying with ISO 15031 protocol, such as P0700 Transmission Control System Fault, P0973 Pressure Control Solenoid A Fault) and transmit them to the TCU. Maintenance personnel can quickly locate fault points through VW's special diagnostic equipment (e.g., VAS 6154), improving maintenance efficiency by 55%.
Intelligent Working Condition Adaptation, Optimized Performance for Multi-Scenarios
It integrates 9 sets of environmental sensing sensors (temperature, pressure, speed, vibration, clutch position sensors) and VW DCT-specific dynamic adjustment algorithms (such as "torque vectoring control" and "coasting energy recovery coordination"), and can optimize working parameters according to different usage scenarios and driving modes:
Low-temperature startup scenario (ambient temperature below -20℃): The warm-up time is shortened to 2-4 minutes through oil circuit preheating technology (with a built-in 45W PTC heating plate). At the same time, the clutch engagement pressure during cold startup is reduced (initial pressure reduced to 10-13MPa) to avoid cold wear of dual clutches.
High-speed cruising scenario (vehicle speed above 90km/h, ECO mode): The system oil pressure is automatically reduced to 5-7MPa to reduce power loss. At the same time, it coordinates with the engine start-stop function, and the measured fuel consumption per 100 kilometers can be reduced by 1.0-1.4L (e.g., Audi A3 40 TFSI model).
Rapid acceleration scenario (throttle opening greater than 90%, SPORT mode): The engagement pressure of K1/K2 clutches is quickly increased to 25-28MPa to enhance clutch rigidity, realizing "launch control" (the 0-100km/h acceleration time of some models is shortened by 0.2-0.4 seconds) and avoiding the "acceleration lag" phenomenon.
Complex road condition scenario (bumpy road vibration frequency greater than 5.5Hz, COMFORT mode): The interference of valve body vibration on clutch adjustment is reduced through an oil pressure buffer design (with built-in four-stage damping valves). At the same time, the alternation timing of dual clutches is optimized, making it suitable for scenarios such as mountain roads and unpaved roads.
Energy recovery scenario (when brake energy recovery is enabled): The clutch separation pressure is dynamically adjusted to ensure no power jitter during the recovery process, improving the energy recovery efficiency (maximum recovery efficiency up to 18%).
INQUIRE NOW 
