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Limp Home Mode system for Hydraulic Excavator

IP.com Disclosure Number: IPCOM000237252D
Publication Date: 2014-Jun-10
Document File: 3 page(s) / 118K

Publishing Venue

The IP.com Prior Art Database

Abstract

Present disclosure related to Limp Home Mode system for Hydraulic Excavator. This disclosure has proposed a method of controlling the machine basic functions when a machine Electronics Control Module (ECM) failure has occurred. In hydraulic excavator master controller control the Engine RPM and pump output pressure. When this master controller fails, we do not have other way to control the Engine RPM and pump output pressure. Accordingly, it is desirable to provide a method for limp home operation when the master controller fails. The Limp Home mode system allows the operator to maneuver the machine to shop or park side when the machine ECM failed. Basic machine operation is possible if the machine is in Limp Home Mode. When the Auto/Manual switch is turned to Manual position, it will activate the Limp Home Mode system. In Limp Home Mode engine speed is fixed to Low engine RPM and EPPR solenoid is energized with fix current. When master control system of machine fails then use of limp home mode to control the engine rpm and hydraulic Pump pressure so that machines basic function can control and machine can move from working area to workshop.

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Page 01 of 3

Title: Limp Home Mode system for Hydraulic Excavator

Abstract
Present disclosure related to Limp Home Mode system for Hydraulic Excavator.

This disclosure has proposed a method of controlling the machine basic functions when a machine Electronics Control Module (ECM) failure has occurred.

In hydraulic excavator master controller control the Engine RPM and pump output pressure. When this master controller fails, we do not have other way to control the Engine RPM and pump output pressure. Accordingly, it is desirable to provide a method for limp home operation when the master controller fails.

The Limp Home mode system allows the operator to maneuver the machine to shop or park side when the machine ECM failed. Basic machine operation is possible if the machine is in Limp Home Mode.

When the Auto/Manual switch is turned to Manual position, it will activate the Limp Home Mode system. In Limp Home Mode engine speed is fixed to Low engine RPM and EPPR solenoid is energized with fix current.

When master control system of machine fails then use of limp home mode to control the engine rpm and hydraulic Pump pressure so that machines basic function can control and machine can move from working area to workshop.


Page 02 of 3

Drawing:

 Master Controller (ECM)

DC-DC

Converter

Auto/Manual

Selection Switch

LIMP

HOME MODE CIRCUIT

Relay RL1

Stepper Motor

 EPPR Solenoid

Engine RPM

Pump Output Pressure

24V Battery

Engine RPM

Fig. 1 Normal mode of operation

Fig. 2 Limp home mode operation

LIMP

HOME MODE CIRCUIT

 Master Contr...