During torque converter operation, the coupling phase is primarily related to torque demand and may occur at various vehicle speeds. True or False?

During torque converter operation, the coupling phase is primarily related to torque demand and may occur at various vehicle speeds. True or False?

• A. True
• B. False
• C. Only at high speeds
• D. Only at low speeds

Answer: (A)

In a torque converter, the coupling phase is the part of power transfer where engine torque is transmitted through the fluid between the impeller and turbine, with some slip still present. This phase is driven by how much torque the drivetrain is asking for. When more torque is required, the converter allows more slip to provide torque multiplication and a smooth transfer of power; as torque demand changes, slip decreases and the turbine speed moves closer to the engine speed, moving toward lock-up. Because slip is controlled by torque demand rather than a fixed speed, this coupling behavior can occur at many different vehicle speeds. So the statement is true.

In a torque converter, the coupling phase is the part of power transfer where engine torque is transmitted through the fluid between the impeller and turbine, with some slip still present. This phase is driven by how much torque the drivetrain is asking for. When more torque is required, the converter allows more slip to provide torque multiplication and a smooth transfer of power; as torque demand changes, slip decreases and the turbine speed moves closer to the engine speed, moving toward lock-up. Because slip is controlled by torque demand rather than a fixed speed, this coupling behavior can occur at many different vehicle speeds. So the statement is true.