Electronic pressure limiting for dual path systems

Patent metadata

Field	Value
Publication number	US-10696327-B2
Application number	US-201816171531-A
Country	US
Kind code	B2
Filing date	Oct 26, 2018
Priority date	Oct 26, 2018
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A pressure limiting system for a dual path machine wherein an input propel command from a propel device is scaled based upon the largest detected pressure in a hydraulic system to determine a modified propel command. Also, response time is adjusted within an electrical control system based upon the type of input propel command signal received.

First claim

What is claimed is:

1. A method of electronically limiting pressure and providing pressure sensitive overrides for a dual path machine, comprising the steps of:
transmitting an input propel command from a propel device to a computer of an electronic control system;
transmitting signals from pressure sensors from a hydraulic system;
determining a modified propel command using a processor and software from the computer by scaling the input propel command based upon the largest pressure sensor signal received; and
adjusting an actuator on a pump based upon the modified propel command; and
determining a type of the input propel command and adjusting a response time of the hydraulic system based on the determination;
wherein response time is decreased when the input propel command is determined to be a speed command.

2. The method of claim 1 wherein electronic hydraulic valves are connected to the actuators and are adapted to vary speed ratios and direction of operation on the pump.

3. The method of claim 1 wherein the input control command includes a steering command and a speed command.

4. The method of claim 1 wherein the step of scaling is applied in conjunction with a control system.

5. The method of claim 1 wherein output from the computer is commanded to pump actuators and motors.

6. The method of claim 1 further comprising the step of determining whether the input propel command is a steering command or a speed command.

7. The method of claim 6 wherein response time is increased when the input propel command is determined to be a steering command.

8. A method of electronically limiting pressure and providing pressure sensitive overrides for a dual path machine, comprising the steps of:
transmitting an input propel command from a propel device to a computer of an electronic control system, wherein the input control command includes a steering command and a speed command;
transmitting signals from pressure sensors from a hydraulic system;
determining a modified propel command using a processor and software from the computer;
adjusting an actuator on a pump based upon the modified propel command; and
determining whether the input propel command is a steering command or a speed command.

9. A method of electronically limiting pressure and providing pressure sensitive overrides for a dual path machine, comprising the steps of:
transmitting an input propel command from a propel device to a computer of an electronic control system;
transmitting signals from pressure sensors from a hydraulic system;
determining a modified propel command using a processor and software from the computer;
adjusting an actuator on a pump based upon the modified propel command; and
determining whether the input propel command is a steering command or a speed command and adjusting response time of the hydraulic system based on the determination.

Assignees

• Danfoss Power Solutions Inc

Inventors

• Spranger Brian E
• Van De Stroet Caleb

Classifications

• F15B21/087 Primary

  Control strategy, e.g. with block diagram · CPC title

• F15B11/17

  using two or more pumps · CPC title

• B62D11/005 Primary

  Hydraulic control systems · CPC title

• F16H61/438

  Control of forward-reverse switching, e.g. control of the swash plate causing discharge in two directions · CPC title

• F16H61/431

  Pump capacity control by electro-hydraulic control means, e.g. using solenoid valves · CPC title