According to the signals taken from sensors, ECU can control the rotate
speed of water pump to change the water circulation so that various EGR
cooling temperatures are achieved automatically. EGR temperature is
controlled accurately so that the quantity of NO
x
in the exaust gas is
reduced and the emission regulations is met.
The main parts of EGR electrical control cooling system was designed.
Based on the heat transfer theory, the EGR cooler was designed. Based on
the principle of Hydromechanics, Venturi pipe was designed. The electrical
water pump’s type was selected and the EGR cooling control system were
designed. In order to design the hardware and the software of the ECU
