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Brand: C.OEFT
OE numbers: 6T75
Product Name: Transmission Control Unit
Compatible model:/
Product status: New
Product weight: 1.4682KG
Packaging size: 63*41*36cm
Product packaging: Neutral Packaging
Car Series: American
Car Type: for Cadillac
Hydraulic System Precision Control for Smooth Shifting
As the core of the 6-speed AT transmission control, the TCU adopts a variable pressure adaptive hydraulic algorithm to achieve precise control of the transmission's hydraulic torque converter and clutch execution components. It collects real-time signals from 12 key sensors (engine speed, vehicle speed, throttle opening, hydraulic oil temperature, clutch pressure, torque converter lock-up status, etc.), and processes them through a 32-bit MCU (mainstream Freescale MC9S12XEP100 chip, operating frequency up to 80 MHz) to calculate the optimal hydraulic pressure curve and shift timing.
In daily urban driving (throttle opening < 50%), the TCU controls the solenoid valve to maintain a low-pressure gradient (0.1 MPa/10 ms), ensuring smooth clutch engagement—for example, when shifting from 2nd to 3rd gear at 40 km/h, the jerk amplitude is controlled below 2.5 m/s², which is slightly higher than luxury models but meets the comfort requirements of mainstream family cars. In dynamic driving scenarios (throttle opening > 80%, such as overtaking on highways), the TCU activates the "rapid pressure boost strategy": the hydraulic pressure is increased by 0.5 MPa within 10 ms, shortening the shift time to 0.3-0.4 seconds. Taking the Chevrolet Camaro 2.0T as an example, when accelerating from 60 km/h to 120 km/h, the TCU completes 3-4-5 gear shifts continuously, with no obvious power interruption.
For the hydraulic torque converter, the TCU adopts a "temperature-dependent lock-up control" strategy: when the hydraulic oil temperature is low (< 40℃, cold start), the lock-up clutch is delayed to engage (engaged at 60 km/h in 3rd gear) to avoid excessive wear; when the temperature is normal (80-90℃), the lock-up is advanced to 45 km/h in 2nd gear, reducing torque converter slip loss by 15% and improving fuel economy.
1. Strong Adaptability to GM Powertrain Systems
The 6T75 TCU adopts a platform-based hardware design and GM's exclusive control software, which is highly compatible with GM's classic engines and transmission variants:
Transmission Compatibility: Fully adapted to 6T75 (front-wheel drive) and 6T75E (all-wheel drive) transmissions, and can be used in common with the upgraded 6T70 TCU (low-torque version) by modifying the software calibration, reducing the inventory pressure of 4S shops and repair factories;
Engine Matching: Compatible with GM's 2.0T SIDI, 2.4L Ecotec, 3.0L V6, 3.6L V6 naturally aspirated/turbocharged engines, and can adjust the shift logic and torque distribution parameters according to different engine torques (250-360 N·m) without hardware replacement;
Regional Adaptation: Optimized for different market conditions—for the Chinese market with frequent urban congestion, the low-speed shift logic is adjusted (e.g., reducing 1-2 gear shift frequency at 20-30 km/h); for the North American market with more highways, the high-speed gear holding time is extended to improve stability.
2. High Durability Meeting Long-Term Usage Needs
The 6T75 TCU adopts a practical and durable hardware structure to adapt to the harsh working environment of the engine compartment, and its reliability has been verified by a large number of market applications:
Hardware Protection: The shell is made of die-cast aluminum alloy (ADC12 material), with IP67 protection level, which can withstand extreme temperatures (-40℃ to 125℃) and vibration (5-2000 Hz, 20 G acceleration), and has good heat dissipation performance—even in high-temperature areas such as the southwest of China, there is no risk of overheating failure;
Circuit Reliability: The internal circuit board adopts a two-layer anti-corrosion coating (acrylic resin + epoxy resin), which is resistant to oil pollution and moisture, and the connector uses tin-plated copper terminals with a plug-in life of 500+ times, effectively avoiding poor contact caused by oxidation;
Rigorous Testing: Before leaving the factory, it undergoes 4,000-hour high-temperature durability testing, 3,000-hour low-temperature cold start testing, and 10,000-cycle thermal shock testing (from -40℃ to 125℃). The market verification shows that the average fault-free working time (MTBF) exceeds 1.2 million hours, and the failure rate is less than 0.5% within 8 years/160,000 km.
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