What transmissions use the torque converter as an integrated retarder to augment the vehicle brakes?

What transmissions use the torque converter as an integrated retarder to augment the vehicle brakes?

• A. Ecolife
• B. Ecomat
• C. Busmatic
• D. DIWA

Answer: (D)

The concept being tested is that some automatic transmissions can use the torque converter itself as an integrated retarder to help slow the vehicle. In these systems, braking energy is dissipated inside the transmission fluid path, not just by the wheel brakes, so the torque converter provides an additional braking torque when commanded. This reduces wear on the service brakes and helps control speed on long descents. DIWA transmissions are designed with this feature, using the torque converter as an integrated retarder to augment braking. That’s why this option is the best fit for the question. The other transmission families listed rely mainly on the standard braking system or on different types of retarders that aren’t torque-converter based, so they don’t provide the same integrated retarder capability.

The concept being tested is that some automatic transmissions can use the torque converter itself as an integrated retarder to help slow the vehicle. In these systems, braking energy is dissipated inside the transmission fluid path, not just by the wheel brakes, so the torque converter provides an additional braking torque when commanded. This reduces wear on the service brakes and helps control speed on long descents.

DIWA transmissions are designed with this feature, using the torque converter as an integrated retarder to augment braking. That’s why this option is the best fit for the question.

The other transmission families listed rely mainly on the standard braking system or on different types of retarders that aren’t torque-converter based, so they don’t provide the same integrated retarder capability.