Steering computing device

A steering computing device that calculates a value of a state variable about a steering apparatus, the steering apparatus including a steering wheel, an input shaft, an intermediate shaft, an output shaft, a first Cardan joint, a second Cardan joint, and steered wheels, the input shaft being connected to the steering wheel, the first Cardan joint being a member connecting the input shaft and the intermediate shaft, the second Cardan joint being a member connecting the intermediate shaft and the output shaft, the steered wheels being configured to receive a steering torque input into the steering wheel, via the input shaft, the intermediate shaft, and the output shaft, the steering computing device comprising:

• a storage device;
• and
• an execution device, wherein:
• mapping data is stored in the storage device, the mapping data being data defining a mapping to output a tilt angle with a first bending angle and a second bending angle being taken as inputs;
• the first bending angle is an angle formed between the input shaft and the intermediate shaft;
• the second bending angle is an angle formed between the output shaft and the intermediate shaft;
• the execution device is configured to execute a bending angle acquisition process and a tilt angle calculation process;
• the bending angle acquisition process is a process of acquiring the first bending angle and the second bending angle;
• the tilt angle calculation process is a process of calculating the tilt angle by inputting the first bending angle and the second bending angle into the mapping;
• and
• the tilt angle is a variable indicative of an angle formed between an axial direction of the input shaft and a reference direction.