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Dual Clutch Automatic Transmission/Transaxles

12. Dual Clutch Automatic Transmission/Transaxles. FIGURE 12–1 A dual clutch automatic uses the best features of an automatic transmission without the power loss of a torque converter.

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Dual Clutch Automatic Transmission/Transaxles

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  1. 12 Dual Clutch Automatic Transmission/Transaxles

  2. FIGURE 12–1 A dual clutch automatic uses the best features of an automatic transmission without the power loss of a torque converter.

  3. FIGURE 12–2 Dual clutch automatic transaxles that use two dry clutches. The larger clutch drives the odd number gear ratios (first, third, and fifth) and the smaller clutch drives the even numbered gear ratios (second, fourth, and sixth).

  4. FIGURE 12–3 (a) A concentric (nested) clutch design, the assembly is shorter in length but taller in height. (b) A parallel clutch design is longer but has a smaller diameter drum assembly.

  5. FIGURE 12–4 Notice the two concentric input shafts. Each shaft is splined to a clutch.

  6. FIGURE 12–5 First gear engaged using clutch 1 (C1) to transmit engine torque.

  7. FIGURE 12–6 Second gear engaged using clutch 2 (C2) to transmit engine torque.

  8. FIGURE 12–7 The shift forks are similar to those used in a manual transmission but are moved using hydraulic pistons.

  9. Frequently Asked QuestionHow Does a Dual Clutch Type Transmission Achieve Better Fuel Economy?One of the advantages of a dual clutch automatic is that it is able to provide improved fuel economy over a conventional torque converter-type automatic. One strategy is to have the unit go into neutral when the vehicle is stopped by disengaging the clutches. This allows the engine to remain running but reduces the load on the engine, which improves fuel economy and reduces vibrations. The clutch is engaged when the driver releases the brake.

  10. Frequently Asked QuestionWhy Is the TCM Using the Position of the Steering Wheel?The steering wheel position (SWP) sensor information is sent to the transmission control module (TCM) over the network to prevent the transmission from upshifting when cornering. This helps the driver by allowing the vehicle to be accelerated when exiting a corner. If the steering wheel position was not part of the shift program, the transmission might likely upshift to a higher gear as the vehicle slows then the transmission may have to downshift again when the vehicle exits the corner.

  11. FIGURE 12–8 Fork position and shaft speed sensors are used as inputs to the TCM.

  12. FIGURE 12–9 The use of a factory or a factory-level aftermarket scan tool is often needed to diagnose the dual clutch transmission system.

  13. Chart 12–1 Selected dual clutch transmission-related diagnostic trouble codes.

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