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Brand: C.OEFT
OE numbers: DF515A11
Product Name: Transmission Assembly
Compatible model: DF515A11
Product status: NEW
Product weight：66.7KG
Packaging size: 100*100*100cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type: for Changan
1. 5-Speed Gear Ratios for Balanced Power and Efficiency
The DF515A11’s optimized gear ratio range (0.720-3.150) is tailored to 1.5L-1.6L naturally aspirated engines (maximum torque 130-170 N·m ):
1st gear (3.150:1): Amplifies torque for smooth starts with two passengers and luggage
2nd gear (1.850:1): Delivers responsive acceleration from 20-40 km/h in urban traffic
3rd gear (1.250:1): Maintains dynamic performance at 40-60 km/h for overtaking
4th gear (0.950:1): Balances power and efficiency at 60-90 km/h on suburban roads
5th gear (0.720:1): Reduces engine speed to 2300 rpm at 120 km/h, lowering fuel consumption by 10%
In the Yuexiang V7, this ratio setup enables 0-100 km/h acceleration in 11.2 seconds while achieving a comprehensive fuel consumption of 6.3 L/100km.
2. TCM Intelligent Control and Driving Mode Adaptation
The integrated TCM monitors 14 key parameters (including clutch temperature, oil pressure, and gear position) in real time, adjusting shift logic based on driving scenarios:
Eco Mode: Upshifts at 1800-2000 rpm to keep the engine in the efficient operating range, reducing urban fuel consumption by 8%
Normal Mode: Balances power and efficiency with upshifts at 2200-2500 rpm, suitable for daily commuting
Sport Mode: Delays upshifts to 3500 rpm, enhancing acceleration response for highway overtaking
The TCM also features slope recognition—when detecting a slope exceeding 15°, it maintains lower gears to utilize engine braking, reducing brake wear by 25% during downhill driving.
3. Comprehensive Fault Protection and Diagnosis
To ensure transmission safety, the DF515A11 integrates multi-layer fault protection mechanisms controlled by the TCM:
Over-Temperature Protection: Triggers a dashboard warning when clutch temperature exceeds 120°C and limits torque output; if temperature reaches 135°C, it switches to "limp mode" (maintaining 3rd gear and reverse) to prevent clutch burnout
Clutch Slippage Protection: Detects abnormal speed differences between clutch input and output shafts (code P0830) and adjusts hydraulic pressure within 0.5 seconds to eliminate slippage
1. Transverse FWD Adaptability for Compact Vehicle Platforms
As Changan’s independently developed 5-speed dual-clutch transmission (DCT) with full intellectual property rights, the DF515A11 is specifically engineered for transverse-engine front-wheel-drive (FWD) compact vehicles, filling the gap for high-efficiency transmissions in the small-displacement market. Its integrated structure (including TCM) weighs approximately 62 kg—8% lighter than dry DCTs of the same class (e.g., Volkswagen 5-speed dry DCT at 67 kg)—thanks to a simplified clutch module and die-cast aluminum alloy casing with ribbed reinforcement. The casing withstands a maximum internal pressure of 19.8 kg/cm² during stall tests, balancing structural rigidity with lightweight demands, making it ideal for models like the Changan Yuexiang V7. This design optimizes front axle load distribution, improving steering responsiveness by 15% compared to traditional 4AT-equipped compact cars.
2. Wet Clutch Design for Superior Smoothness and Reliability
Distinguishing itself from problematic dry DCTs, the DF515A11 adopts a wet dual-clutch structure that uses transmission oil for continuous cooling and lubrication, eliminating concerns about overheating and jitter in stop-and-go traffic. The clutch friction plates are made of ceramic composite material compatible with Changan’s dedicated DCT oil, reducing wear by 40% compared to dry clutch friction materials. The electronic-hydraulic control system modulates clutch engagement pressure with 0.01 MPa precision, cutting shift shock by 50% and achieving a shift time of 0.32 seconds between 2nd and 3rd gears—imperceptible to drivers during daily commuting. Third-party durability tests confirm the wet clutch module maintains stable performance after 300,000 km of urban driving, far exceeding the service life of dry clutches.
3. High Transmission Efficiency for Fuel Economy
Targeting small-displacement engines, the DF515A11 achieves a comprehensive transmission efficiency exceeding 90% —12% higher than traditional 4-speed automatic transmissions. Its gear set uses a helical gear design with a contact ratio of 2.1, reducing meshing friction loss by 30% compared to straight-cut gears. The TCM (Transmission Control Module) integrates intelligent shift logic that pre-selects the next gear based on vehicle speed and throttle position, minimizing power interruption during shifts. When matched with Changan’s 1.6L naturally aspirated engine (maximum torque 150 N·m), the assembly reduces comprehensive fuel consumption by 0.8-1.2 L/100km compared to 4AT-equipped models, aligning with compact car users’ fuel-saving demands.
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