Fluid application system and fluid application method

A fluid application system comprising:

• an application apparatus that discharges a fluid to a workpiece;
• a movement apparatus that relatively moves the application apparatus and the workpiece;
• and
• a control apparatus that controls the application apparatus, wherein
• the application apparatus includes:
• a power source;
• a fluid supply apparatus that changes a supply amount of the fluid per unit time in accordance with an output of the power source;
• and a nozzle that discharges the fluid supplied from the fluid supply apparatus, to the workpiece, and
• from application start up to application end:
• at any point when a movement speed of the nozzle with respect to the workpiece is decreasing and the output of the power source is decreasing in accordance with the decrease in the movement speed to thereby decrease the discharge amount of the fluid per unit time from the nozzle by a target variation amount such that the line width of the fluid applied to the workpiece is constant,
• the control apparatus decreases the output of the power source beyond a theoretical output of the power source obtained from the target variation amount of the discharge amount, and then sets the output of the power source to the theoretical output such that the change amount of the internal pressure of the nozzle is coincident with an amount by which the internal pressure of the nozzle needs to drop, the amount being obtained from the target variation amount of the discharge amount, and
• at any point when the movement speed of the nozzle with respect to the workpiece is increasing and the output of the power source is increasing in accordance with the increase in the movement speed to thereby increase the discharge amount of the fluid per unit time from the nozzle by a target variation amount such that the line width of the fluid applied to the workpiece is constant,
• the control apparatus increases the output of the power source beyond a theoretical output of the power source obtained from the target variation amount of the discharge amount, and then sets the output of the power source to the theoretical output such that the change amount of the internal pressure of the nozzle is coincident with an amount by which the internal pressure of the nozzle needs to rise, the amount being obtained from the target variation amount of the discharge amount.