Which control opens the solenoid to allow fluid flow to control clutch application?

Which control opens the solenoid to allow fluid flow to control clutch application?

• A. Primary modulation
• B. Secondary modulation
• C. Sub-modulation
• D. Fast adaptive mode

Answer: (A)

The main idea is that the clutch is actuated by hydraulic pressure controlled through a solenoid, and this control is driven by the primary modulation signal. When the solenoid is energized, it opens to let hydraulic fluid flow into the clutch circuit. The amount of flow, and thus the pressure applied to engage the clutch, is determined by the duty cycle of the signal driving the solenoid—the higher the duty cycle, the more the solenoid opens over time, and the more the clutch engages. Other modulation terms describe additional or alternative control schemes that aren’t the primary method for metering fluid to the clutch in this setup, so the primary modulation approach is the correct concept here.

The main idea is that the clutch is actuated by hydraulic pressure controlled through a solenoid, and this control is driven by the primary modulation signal. When the solenoid is energized, it opens to let hydraulic fluid flow into the clutch circuit. The amount of flow, and thus the pressure applied to engage the clutch, is determined by the duty cycle of the signal driving the solenoid—the higher the duty cycle, the more the solenoid opens over time, and the more the clutch engages. Other modulation terms describe additional or alternative control schemes that aren’t the primary method for metering fluid to the clutch in this setup, so the primary modulation approach is the correct concept here.