Speed control system for a hydrostatic transmission

Patent metadata

Field	Value
Publication number	US-9512918-B2
Application number	US-201414301758-A
Country	US
Kind code	B2
Filing date	Jun 11, 2014
Priority date	Jun 14, 2013
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

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.

First claim

What is claimed:

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…

Assignees

• Danfoss Power Solutions Inc

Inventors

• Rozycki Frank J
• Nielsen Simon L
• Lafayette Gary R

Classifications

• F16H61/4157

  Mechanical Engineering · mapped topic

• F16H61/4017 Primary

  Mechanical Engineering · mapped topic

• F16H61/48 Primary

  Mechanical Engineering · mapped topic

• B60W10/196

  Operations & Transport · mapped topic

• F16H61/421

  Mechanical Engineering · mapped topic