Electric thermostat, engine coolant thermostat assembly for BMW engine B48, OEM:11537644811

With the rapid development of automotive engine technology, the requirements for engine cooling system are constantly increasing. In the new generation of B48TU series engine adopts the segmented cooling control, engine segmented cooling control is a newly developed control scheme.

1.Engine section cooling is to control the flux of different engine cooling circuits connected to the heat management module (replacing the electronic thermostat) by controlling the position of the electric section cooling valve (SCV) according to the working range of the engine. For example, the flow of coolant through the crankcase can be interrupted as needed during the warm-up phase and partial load operation mode. In this case, the coolant flows only through the cylinder head. In the warm-up stage, the engine can reach its movement temperature faster, and low emission engine operation can be realized under partial load operation mode.

2. Structure Composition of engine block cooling control system The engine adopts block cooling control cooling system, its core component is the thermal management module. The thermal management module is a new type of electric thermostat, which replaces the traditional electronic thermostat. The electric drive device of the thermal management module is composed of a DC motor, a variable speed mechanism and a position sensor. The connection relation of its internal circuit is shown in the figure.

3. The control unit controls the DC motor to adjust the position of the rotary spool valve within a specified range, and the sensor monitors it. On the one hand, a rotary slide valve in the heat management module connects or closes the open cross section of different cooling channels in a variable way, so as to cool different engine components; In addition, according to the cooling requirements of the engine during operation, the flow rate of the cooling channel connected to the heat management module can be adjusted in an accurate way by adjusting the size of the open cross section area to achieve the best cooling effect. The structure as the picture below: