Coil spring modeling apparatus and method utilizing a torsion detection to control an actuator unit

A method of controlling a coil spring modeling apparatus, which comprises:

• an actuator unit including hydraulic cylinders arranged between a first attachment member disposed on a lower spring seat and a second attachment member disposed on an upper spring seat;
• and
• a hydraulic pressure supply device which supplies fluid pressure to the hydraulic cylinders,
• the method comprising:
• applying a torque about a kingpin axis to the first attachment member relative to the second attachment member;
• detecting a torsional angle formed between the first attachment member and the second attachment member;
• and
• correcting a force line position or controlling the hydraulic cylinders based on the detected torsional angle.

A coil spring modeling apparatus provided on a strut comprising a lower spring seat and an upper spring seat, the coil spring modeling apparatus comprising:

• a first attachment member disposed on the lower spring seat;
• a second attachment member disposed on the upper spring seat;
• an actuator unit which is arranged between the first attachment member and the second attachment member, and which is extendible and retractable;
• a controller configured to control the actuator unit;
• and
• a torsion detection mechanism configured to detect a torsional angle formed between the first attachment member and the second attachment member;
• wherein the controller controls the actuator unit such that the torsional angle becomes zero when the torsional angle is detected by the torsion detection mechanism.