DETECTING METHOD FOR SHORTAGE OF COOLANT OF ELECTRIC WATER PUMP

摘要

The present invention relates to a method for diagnosing a shortage of cooling water of an electric water pump which measures the driving torque of a motor via a vector control and precisely detects a shortage of cooling water on a real time basis, without being affected by the driving RPM of an existing motor and a voltage of a power source, by comparing a reference value and the measured driving torque. [Reference numerals] (10) Voltage source invertor; (12) Clock converting unit; (13) Phase voltage reconstruction unit; (14) Position estimating unit from sliding-mode rotor; (15) Speed measuring device; (16) Peak converting unit; (20) Inverse peak converting unit; (21) Spatial vector PWM generator; (22) Reference torque table per speed; (24) Torque comparator; (AA) Measure RPM; (BB) Measure Torque; (CC) Detect shortage of cooling water; (DD) DC bus