US 12,331,487 B2
Device for controlling working unit of construction equipment
Do Sang Park, Gyeongsangnam-do (KR)
Assigned to VOLVO CONSTRUCTION EQUIPMENT AB, Eskilstuna (SE)
Appl. No. 17/282,235
Filed by VOLVO CONSTRUCTION EQUIPMENT AB, Eskilstuna (SE)
PCT Filed Oct. 2, 2018, PCT No. PCT/KR2018/011703
§ 371(c)(1), (2) Date Apr. 1, 2021,
PCT Pub. No. WO2020/071567, PCT Pub. Date Apr. 9, 2020.
Prior Publication US 2021/0348365 A1, Nov. 11, 2021
Int. Cl. E02F 9/22 (2006.01); E02F 9/20 (2006.01); E02F 9/26 (2006.01)
CPC E02F 9/2203 (2013.01) [E02F 9/2004 (2013.01); E02F 9/267 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A device for controlling a working unit of construction equipment, the device comprising:
a hydraulic control device configured to hydraulically control a working unit and operated by an operating lever;
a plurality of sub-electronic control units (ECU) electrically connected with the hydraulic control device;
a main ECU configured to receive information on states of the hydraulic control device and the plurality of sub-ECUs;
a relay configured to apply or cut off electric power to the plurality of sub-ECUs by a signal generated from the main ECU; and
an emergency mode switch configured to turn an emergency mode on/off,
wherein when the emergency mode switch is turned on, the relay to which electric power is cut off according to a main ECU's failure diagnosis signal applies or cuts off electric power to the plurality of sub-ECUs by movement of the operating lever,
wherein the main ECU determines whether the hydraulic control device malfunctions according to a state information measurement value of the hydraulic control device measured by the sub-ECU,
wherein the main ECU controls repeated turning on/off of the relay according to an on-signal of the emergency mode switch to allow the working unit to be moved in an intermittent manner even when the working unit is stopped due to failure of the construction equipment in an ascending state.