Determination of a state of a fluid-operated system of a vehicle

A method comprising:

• receiving sensor data indicating a first characteristic of a fluid-operated system of a vehicle;
• estimating a second characteristic of the system, based at least in part on the sensor data and at least in part on a model representing a correlation between the first characteristic and the second characteristic;
• determining, based at least in part on the second characteristic, a state of the system;
• and
• controlling the vehicle based at least in part on the state of the system.

One or more non-transitory computer-readable media storing instructions executable by one or more processors, wherein the instructions, when executed, cause the one or more processors to perform operations comprising:

• receiving sensor data indicating a first characteristic of a fluid-operated system of a vehicle;
• estimating a second characteristic of the system, based at least in part on the sensor data and at least in part on a model representing a correlation between the first characteristic and the second characteristic;
• determining, based at least in part on the second characteristic, a state of the system;
• and
• controlling the vehicle based at least in part on the state of the system.