Self-propelled engine overspeed control

An agricultural vehicle comprising:

• a chassis;
• an engine mounted to the chassis;
• at least one ground drive system comprising:
• a respective ground drive pump configured to be driven by the engine,
• one or more respective ground drive assemblies configured to support and selectively drive the chassis on a ground surface, each respective ground drive assembly comprising a respective drive wheel and a respective drive wheel motor, and
• a respective hydraulic ground drive circuit configured to convey hydraulic fluid between the respective ground drive pump and the respective drive wheel motor;
• at least one auxiliary hydraulic system comprising:
• a respective auxiliary pump configured to be driven by the engine,
• a respective driven auxiliary mechanism configured to be operated by the respective auxiliary pump,
• a respective auxiliary hydraulic circuit configured to convey a respective auxiliary flow of hydraulic fluid between the respective auxiliary pump and the respective driven auxiliary mechanism, and
• a respective auxiliary hydraulic component located in the auxiliary hydraulic circuit;
• at least one driveline configured to mechanically connect the engine to each respective ground drive pump and each respective auxiliary pump, and the driveline comprises a gearbox having an input connected to the engine, a first output connected to each respective ground drive pump, and a second output connected to each respective auxiliary pump;
• and
• a control system comprising a processor and a memory that stores non-transient instructions that, when executed by the processor, control the vehicle to:
• measure an engine rotation speed;
• compare the engine rotation speed to a threshold value;
• and
• upon determining that the engine rotation speed satisfies the threshold value:
• operate the respective auxiliary hydraulic component of at least one auxiliary hydraulic system to generate a respective braking torque at the respective auxiliary pump, and
• transmit each respective braking torque to the engine to bias the engine to operate at a decreased rotation speed.