EMERGENCY STOP METHOD FOR HYBRID CONSTRUCTION EQUIPMENT AND BRAKE CONTROL DEVICE

• US 20150042259A1
• Filed: 12/27/2012
• Published: 02/12/2015
• Est. Priority Date: 12/28/2011
• Status: Active Grant

• Current Assignee: HD Hyundai Infracore Co., Ltd.
• Original Assignee: Doosan Infracore Company Limited
• Inventors: Kim, Sang Il, Kim, Kyeong Keun, Kang, Byung Il
• Granted Patent: US 9,431,930 B2
• Time in Patent Office: Days
• US Class Current: 318/703
• CPC Class Codes: B60T 1/062 acting on transmission parts
• CPC Class Codes: E02F 9/128 Braking systems
• CPC Class Codes: E02F 9/2095 Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans control of hydraulic driven equipment E02F9/22
• CPC Class Codes: E02F 9/226 Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
• CPC Class Codes: E02F 9/268 with failure correction follow-up actions
• CPC Class Codes: H02P 3/14 by regenerative braking

Abstract

The present disclosure relates to an emergency stop method for hybrid construction equipment and a brake control device, and more particularly, to an emergency stop method for hybrid construction equipment and a brake control device, which may confirm a failure occurrence location of the hybrid construction equipment, absorb inertial energy of the swing body using several functions for each generated failure location so as to stably stop the swing body in an emergency manner, and when the failure occurs in the hybrid construction equipment, create the brake pattern by using the swing speed or the front information, control a brake of the swing body by controlling a voltage control valve or a hydraulic valve in accordance with the created brake pattern, such that a user may smoothly stop the swing body in accordance with a desired stop speed profile.

Claims

1. An emergency stop method for a hybrid construction equipment, comprising:

confirming a failure occurrence location at a swing side, an engine side, and an ultracapacitor side of the hybrid construction equipment;

turning off an inverter or a converter connected with the confirmed failure occurrence location; and

operating the inverter or the converter at a location that is not the confirmed failure occurrence location, and absorbing inertial energy of a swing body through an ultracapacitor or an engine auxiliary motor so as to perform an emergency stop.

2. The emergency stop method of claim 1, when the failure occurrence location is at the swing side, wherein the operating the inverter or the converter operates an engine side inverter or an ultracapacitor side converter, and performs DC link voltage control so as to absorb inertial energy of a swing motor.

3. The emergency stop method of claim 1, when the failure occurrence location is at the engine side, wherein the operating the inverter or the converter operates a swing side inverter and the ultracapacitor side converter, performs swing zero velocity control, and stores inertial energy of the swing motor in the ultracapacitor.

4. The emergency stop method of claim 1, when the failure occurrence location is at the ultracapacitor side, wherein the operating the inverter or the converter operates the swing side inverter and the engine side inverter, performs swing zero velocity control, and consumes inertial energy.

5. The emergency stop method of claim 1, further comprising:

allowing the swing body to be stopped by using the emergency stop step together with a mechanical brake in order to shorten time for decelerating the swing body.

6. The emergency stop method of claim 2, when the engine side inverter is operated, wherein the engine auxiliary motor is operated as a motor that assists output of the engine.

7. The emergency stop method of claim , when the ultracapacitor is fully charged in a state in which the swing body is rotated after the ultracapacitor side converter is operated, wherein the swing body is stopped using the mechanical brake provided in the swing body.

8. A brake control device for hybrid construction equipment, comprising:

a brake for stopping a swing body when failure occurs in the construction equipment;

a drive valve which is formed in a hydraulic manner or a voltage controlled manner, and controls pressure or an amount of fluid applied to the brake; and

a control unit which determines a brake pattern using front information or a swing speed of the swing body, and controls the drive valve while creating a voltage control signal or a hydraulic pressure control signal so that the swing body is stopped depending on the determined brake pattern.

9. The brake control device of claim 8, when the drive valve is a hydraulic valve, wherein the control unit creates the brake pattern in a pulse width modulation manner using the swing speed of the front information, or the swing body, and controls the drive valve in accordance with a hydraulic pressure control signal of the created pulse width modulation manner.

10. The brake control device of claim 8, when the drive valve is a voltage controlled valve, wherein the control unit creates the brake pattern depending on a predetermined stop speed profile using the front information or the swing speed of the swing body, and controls the drive valve in accordance with the created voltage control signal.