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Brand: C.OEFT
OE numbers: AA80E AA81E
Product Name: Transmission valve body assembly
Compatible model:
Product status: Remanufactured
Product weight: 10.000KG
Packaging size: 63X41X36cm
Product packaging: Neutral Packaging
Car Series: American
Car Type: for Cadillac
1.Core Functions of Hydraulic Control
Precise Control of Gear Shifting
Hydraulic oil is distributed in a directional manner through the solenoid valve group to drive the engagement/disengagement of C1-C4 clutches and B1-B2 brakes, enabling smooth shifting between 8 forward gears and reverse gear. For example, SL1 controls the pressure of the C1 clutch, and SL5 controls the pressure of the B1 brake; together with the planetary gear set, they complete the switching of power transmission paths.
Dynamic Oil Pressure Regulation.
2.Electronic Cooperative Control Functions
Multi-System Cooperative Operation
The ECT ECU is linked with the engine ECU via the CAN bus to realize cooperative control of the transmission system. For instance, during rapid acceleration, the engine torque is increased first before downshifting to avoid power interruption; during coasting, downshift control is automatically activated to recover braking energy.
3. Condition Monitoring and Protection Functions
Real-Time Monitoring of Full Parameters
It integrates multi-dimensional sensors for ATF temperature, oil pressure, and rotational speed, which update data every 10ms. The ECT ECU adjusts the control strategy based on this data. For example, it extends the lock-up delay during low-temperature startup and increases the cooling oil circuit pressure under high-temperature conditions.
1. Precise and Efficient Hydraulic Control Syste
Intelligent Dynamic Pressure Correction
A built-in ATF temperature sensor monitors the oil temperature in real time. The ECT ECU dynamically corrects the clutch pressure based on temperature data, ensuring smooth shifting even in extreme temperature ranges from -30℃ to 120℃. The SLT solenoid precisely controls the line pressure to adapt to power demands under different loads
2.Lightweight and Structural Optimization Design
Compact Integrated Layout
The AA80E adopts a combined structure of upper and lower valve bodies. By optimizing the length of oil passages and reducing the number of valve components, it achieves the same volume as the old-generation 6AT transmission. Combined with the aluminum alloy die-casting process, its total weight is only 95kg. The AA81E further upgrades to an integrated housing, which increases rigidity by 30% while reducing weight by an additional 10%.
Low-Noise Mute Structure
The AA81E optimizes the design of the valve body's convex positions to reduce the impact of oil flow and resonance. Combined with a pendulum-type shock absorber, it effectively lowers operational noise.
3. Low Energy Consumption and Easy Maintenance Advantages
Energy-Saving Hydraulic Circuit Design
The valve body adopts a low-resistance oil passage (with the cross-sectional area of the passage optimized to 12mm²), which reduces the flow resistance of the oil and lowers the energy consumption of the hydraulic system by 8%. The SLU solenoid valve (lock-up control solenoid valve) uses PWM (Pulse Width Modulation) control technology, which ensures lock-up accuracy while reducing the working current of the solenoid valve (from 1.5A to 0.8A), thereby decreasing the energy consumption of the electrical system.
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