Pump Discharge Flow-Rate Control Device for Variable Gain

The patent applies dynamics by making the gain of the pump discharge flow rate variable rather than fixed. The control device dynamically adjusts the gain based on the pump rotation speed, switching between a first gain (higher) for low-to-intermediate speeds and a second gain (lower) for intermediate-to-high speeds. This dynamic adjustment resolves the contradiction by adapting the system characteristics to different operating conditions, improving operability when needed while maintaining work efficiency when not needed.

The patent changes the parameter of gain (change rate of discharge flow rate with respect to rotation speed) based on rotation speed zones. By switching between different gain values (first gain and second gain) depending on the operating range, the system optimizes both operability and work efficiency across different engine speed zones, resolving the technical contradiction between these two opposing requirements.

The control device dynamically switches the gain value based on the pump rotation speed zone. During intermediate-to-high speed operation, it applies a lower second gain to improve work efficiency, while during low-to-intermediate speeds, it applies a higher first gain to improve operability. This dynamic parameter adjustment resolves the contradiction by ensuring the appropriate gain is applied at the appropriate operating condition.

The patent changes the gain parameter according to the pump rotation speed, using a first gain for low-to-intermediate zones and a second gain for intermediate-to-high zones. This parameter change strategy ensures that operability is maintained when high responsiveness is needed, while work efficiency is optimized when the system operates at higher speeds, resolving the technical contradiction.