Coolant temperature controlling system for engine performance test

Abstract

The present invention provides a coolant temperature control system for engine performance test, comprising an internal coolant circulation system, a heat exchange unit, a temperature monitoring and control unit, and an external coolant circulation system, wherein, the internal coolant circulation system and the external coolant circulation system are connected to the heat exchange unit respectively, and the internal coolant circulation system is connected to the engine; the temperature monitoring and control unit is connected to the internal coolant circulation system, the heat exchange unit, and the external coolant circulation system respectively, and the internal coolant circulation system is a closed internal circulation system. A vapor exhaust pipe connects the water channel in the engine cylinder head to an expansion water tank; a bypass pipe and a bypass valve are mounted to the water inlet and water outlet of the engine.

1 . A coolant temperature control system for engine performance test, comprising an internal coolant circulation system, a heat exchange unit, a temperature monitoring and control unit, and an external coolant circulation system, wherein, the internal coolant circulation system and the external coolant circulation system are connected to the heat exchange unit respectively, and the internal coolant circulation system is connected to the engine; the temperature monitoring and control unit is connected to the internal coolant circulation system, the heat exchange unit, and the external coolant circulation system; characterized in that, the internal coolant circulation system is a closed internal circulation system provided with a bypass unit for reducing the difference between water inlet pressure and water outlet pressure of the internal coolant circulation system, the bypass unit comprises a bypass pipe and a bypass valve, the bypass valve is mounted on the bypass pipe, and the bypass pipe communicates the engine water inlet pipe with the engine water outlet pipe. 
     
     
         2 . The coolant temperature control system according to  claim 1 , characterized in that, the closed internal circulation system comprises the engine water outlet pipe, an expansion water tank, a heat exchange pipe, the engine water inlet pipe, and the bypass unit, which are connected in sequence; the engine water outlet pipe is connected to the water outlet of the engine; the engine water inlet pipe is connected to the water inlet of the engine; the heat exchange pipe is connected to the heat exchange unit. 
     
     
         3 . The coolant temperature control system according to  claim 2 , characterized in that, the closed internal circulation system further comprises a vapor exhaust unit which comprises an extension pipe and an vapor exhaust pipe, wherein, one end of the extension pipe is connected to the top of the expansion tank, and the other end of the extension pipe is provided with a valve; the vapor exhaust pipe connects a water channel in the cylinder head of the engine to the extension pipe. 
     
     
         4 . The coolant temperature control system according to  claim 1 , characterized in that, the temperature monitoring and control system comprises a temperature sensor and an electric temperature control box that are connected to each other, wherein, the temperature sensor is mounted on the engine water outlet pipe, and the electric temperature control box is connected to the heat exchange unit and the external coolant circulation system. 
     
     
         5 . The coolant temperature control system according to  claim 1 , characterized in that, the heat exchange unit is a plate-type heat exchanger. 
     
     
         6 . The coolant temperature control system according to  claim 2 , characterized in that, the heat exchange pipe is further provided with a manual bleed valve and an automatic bleed valve. 
     
     
         7 . The coolant temperature control system according to  claim 1 , characterized in that, the engine water inlet pipe is further provided with a water replenishing valve. 
     
     
         8 . The coolant temperature control system according to  claim 2 , characterized in that, a coolant filter is further provided on the heat exchanger tube at the end near the expansion water tank. 
     
     
         9 . The coolant temperature control system according to  claim 2 , characterized in that, a regulating valve is provided at the joint between the heat exchange pipe and the engine water inlet pipe. 
     
     
         10 . The coolant temperature control system according to  claim 2 , characterized in that, a valve is provided at the joint between the engine water outlet pipe and the expansion water tank, and a valve is provided at the joint between the heat exchange pipe and the engine water inlet pipe.