Structure for controlling hydraulic pump for driving engine cooling fan of hybrid vehicle

Abstract

A system for controlling a hydraulic pump for operating an engine cooling fan of a hybrid vehicle, which allows a hydraulic pump for driving an engine cooling fan of a hybrid vehicle to be driven by power provided from a transmission PTO of a hybrid vehicle while an engine is idling. Furthermore, the hydraulic pump to be driven may be driven by power supplied from an electric motor when the engine is stopped. As a result, an engine coolant temperature may be properly managed by operating the engine cooling fan of a hybrid vehicle even when the engine is stopped.

What is claimed is: 
     
         1 . A system for controlling a hydraulic pump for operating an engine cooling fan of a hybrid vehicle, wherein the hydraulic pump is configured to be operated via power from a transmission PTO while an engine is idling, and configured to be operated via power from an electric motor when the engine is stopped. 
     
     
         2 . The system of  claim 1 , further comprising:
 an accumulator connected to the hydraulic pump to store hydraulic pressure generated by the hydraulic pump,   wherein the hydraulic pressure produced from the hydraulic pump is provided to and stored in the accumulator, and the hydraulic pressure stored in the accumulator is utilized to operate a fan driving motor for operating the cooling fan.   
     
     
         3 . The system of  claim 2 , wherein the hydraulic pump is driven by brake force generated when a regenerative brake operation is performed, and hydraulic pressure produced by the hydraulic pump is stored in the accumulator. 
     
     
         4 . The system of  claim 2 , wherein when an engine of a vehicle is stopped, the hydraulic pressure stored in the accumulator is supplied, and after the hydraulic pressure stored in the accumulator is consumed, the electric motor is operated to drive a hydraulic motor within the hydraulic pump. 
     
     
         5 . The system of  claim 1 , wherein the hydraulic pump is connected to the transmission PTO and the electric motor by a gear assembly. 
     
     
         6 . A system comprising:
 a pump configured to operate an engine cooling fan of a hybrid vehicle,   a transmission power take off (PTO) operably connected to the pump; and   an electric motor operably connected to the pump,   wherein the pump is operated by the transmission PTO while an engine is idling, and the electric motor when the engine is stopped.   
     
     
         7 . The system of  claim 6 , wherein the pump is a hydraulic pump. 
     
     
         8 . The system of  claim 7 , further comprising:
 an accumulator connected to the hydraulic pump to store hydraulic pressure generated by the hydraulic pump,   wherein the hydraulic pressure produced from the hydraulic pump is provided to and stored in the accumulator, and the hydraulic pressure stored in the accumulator is utilized to operate a fan driving motor for operating the cooling fan.   
     
     
         9 . The system of  claim 8 , wherein the hydraulic pump is driven by a brake force generated when a regenerative brake operation is performed, and hydraulic pressure produced by the hydraulic pump is stored in the accumulator. 
     
     
         10 . The system of  claim 8 , wherein when an engine of a vehicle is stopped, the hydraulic pressure stored in the accumulator is supplied, and after the hydraulic pressure stored in the accumulator is consumed, the electric motor is operated to drive a hydraulic motor within the hydraulic pump. 
     
     
         11 . The structure of  claim 7 , wherein the hydraulic pump is connected to the transmission PTO and the electric motor by a gear assembly.