Which mechanism ensures precise flow control of hydraulic fluid in automated machinery using proportional valves?

💡 Explanation

When fine control is required, proportional valves use pulse-width modulation (PWM) to vary the average current to the solenoid in hydraulic systems, which adjusts valve opening proportionally to the duty cycle. Therefore, PWM of solenoid current achieves precise control, rather than mechanical feedback or alternative adjustments applicable in different control strategies.

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