0DE927711B

1. Dual-Clutch Precise Coordination for Fast and Smooth Shifting

As the core of wet DSG control, the TCU adopts a dual-clutch pressure adaptive synergy algorithm to achieve millisecond-level control of the odd/even gear clutches (Clutch 1 for 1st/3rd/5th/7th gears, Clutch 2 for 2nd/4th/6th/R gears). It collects real-time signals from 14 key sensors (clutch temperature, clutch travel, input/output shaft speed, hydraulic oil pressure, motor torque for hybrid models, etc.), and processes them through a dual-core MCU (Infineon AURIX TC377, operating frequency up to 200 MHz) to calculate the optimal clutch engagement pressure and pre-selection timing.

In daily urban driving (throttle opening < 50%), the TCU controls the clutch engagement pressure gradient to 0.08 MPa/10 ms—for example, when shifting from 2nd to 3rd gear at 45 km/h, the pressure of Clutch 2 (disengaging) decreases synchronously with the pressure of Clutch 1 (engaging), keeping the jerk amplitude below 2.2 m/s², which is comparable to the comfort of mid-range AT transmissions. In dynamic driving scenarios (throttle opening > 80%, such as sport mode), the TCU activates the "pre-selection + rapid pressure boost" strategy: while the current gear is engaged, it pre-charges the next gear clutch with 0.2 MPa low pressure; when shifting is triggered, the pressure rises by 0.6 MPa within 8 ms, shortening the shift time to 0.18-0.25 seconds. Taking the Volkswagen Golf R-Line (equipped with DQ381) as an example, when accelerating from 0 to 100 km/h, the TCU completes 1-2-3-4 gear shifts continuously, with no obvious power interruption.

For wet DSG’s unique hydraulic oil cooling system, the TCU links the oil pump speed to clutch temperature: when the clutch temperature is 80-100℃ (normal range), the oil pump runs at medium speed (2,500 rpm); when the temperature exceeds 110℃ (high load, such as uphill climbing with full throttle), the oil pump speed increases to 3,200 rpm, enhancing heat dissipation and reducing clutch wear by 25%.

2. Adaptive Shift Logic Matching Driving Habits and Scenarios

The 0DE927711B TCU is equipped with a DSG-specific driving habit learning system that classifies driving styles into three types ("gentle", "normal", "aggressive") by analyzing 600+ sets of historical data (throttle change rate, brake depth, shift frequency, steering angle) stored in the EEPROM (write cycle of 200,000 times), and updates the shift map every 40 km of driving.

Gentle Driving (throttle change rate < 3%/s): The TCU advances upshifting—for example, shifting from 3rd to 4th gear at 50 km/h instead of 55 km/h, and keeping the engine speed below 1,800 rpm during constant speed driving. Taking the Audi A3 40 TFSI as an example, the comprehensive fuel consumption can be reduced to 6.5-7.0 L/100 km;

Aggressive Driving (throttle change rate > 7%/s, frequent rapid acceleration): The TCU delays upshifting and increases downshift sensitivity—for example, when the driver depresses the accelerator deeply at 80 km/h, it quickly downshifts from 6th gear to 4th gear, and the engine speed rises to 4,000 rpm in an instant to provide peak torque (320 N·m for 2.0T high-power engines);

Slope and Load Adaptation: When driving on uphill roads (detected by the vehicle’s inclination sensor), the TCU extends gear holding time—for example, maintaining 3rd gear when climbing a 12° slope at 60 km/h to avoid frequent shifting; when carrying heavy loads (detected by suspension pressure sensors), it increases clutch engagement pressure by 0.15 MPa to prevent slipping.