Patent ID: 8801393

Claim:
A method for providing a pumping pressure to a vehicle having an engine that provides mechanical energy to a fluid delivery system and for moving the vehicle, the method comprising: providing a pressure control system to the vehicle and operatively coupling the pressure control system to the engine and the fluid delivery system, the pressure control system being configured to complete the steps of: causing the fluid delivery system to change liquid output pressure without changing the speed of the engine being used to move the vehicle; sending a first signal to the fluid delivery system, the first signal representing a command to cause the fluid delivery system to increase liquid output pressure, determining that the liquid output pressure is not increasing as expected in response to the sent first signal, receiving a second signal representing the engine speed at the pressure control system, using the pressure control system to determine that the engine is operating at a relatively high speed, sending a third signal to the fluid delivery system, the third signal representing a command to return the liquid output pressure to a last reached pressure value, and causing a low supply indication to be communicated from the pressure control system.