ELECTRIC WATER PUMP CONTROL [SKYACTIV-D 1.5]SM2760083
ELECTRIC WATER PUMP CONTROL [SKYACTIV-D 1.5]
id0140z5988800
Outline
• The PCM controls the operation of the electric water pump according to engine operation conditions to adjust the cooling performance of the water-cooled charge air cooler.
Block Diagram
atsuzn00000609
Operation
• The PCM detects the intake air temperature after passing through the water-cooled charge air cooler using the boost air temperature sensor.
• The PCM controls the electric water pump operation/non-operation so that the intake air temperature after passing through the water-cooled charge air cooler is the target intake air temperature.
• The PCM calculates the target intake air temperature according to the following conditions to control the electric water pump operation/non-operation.
• When all of the following conditions are met, the electric water pump operation/non-operation is repeated to prevent the water-cooled charge air cooler from over-cooling.
― Battery voltage: 9―16 V
― Engine operation conditions (condition other than engine start)
― Intake air temperature: 50 °C {122 °F} or more and 5 °C {41 °F} or more than target intake air temperature
• When all of the following conditions are met, the PCM operates the electric water pump continuously to cool the water-cooled charge air cooler rapidly.
― Battery voltage: 9―16 V
― Engine operation conditions (condition other than engine start)
― Intake air temperature: 50 degrees °C {122 °F} or more and the temperature difference between the target intake air temperature and intake air temperature is less than 5 degrees °C {41 °F}.