Speed control system for a hydrostatic transmission

摘要

A speed control system for a hydrostatic transmission includes an engine having a drive shaft connected to a hydraulic pump. At least one hydrostatic motor is connected to the pump in a closed circuit by a flow line. Connected to the motor via a system shaft is a vehicle system. A controller is connected to a plurality of sensors and a high pressure relief valve that is connected to the flow line between the pump and the motor. Based on information received from the sensors, the controller sets the pump and motor displacements to limit the pressure to a value that will not overspeed the engine and allow the system to automatically provide braking beyond the engine's capability. This may be accomplished through the use of various algorithms.

主权项

1. A speed control system, comprising:
an engine having a drive shaft connected to a hydraulic pump; at least one hydraulic motor connected to the hydraulic pump in a closed circuit by a flow line; a vehicle system connected to the at least one hydraulic by a system shaft; at least one high pressure relief valve connected to the flow line between the hydraulic pump and the hydraulic motor; a controller having a processor to operate software logic connected to the closed circuit and a plurality of sensors; wherein the controller detects a braking demand beyond the engine's capability and commands the pump to a displacement at which engine overspeed will occur.