Patent ID: 8904974
Filing Date: 2014-12-09
Classification: F01P,F02P,F04B

Abstract:
1. An engine cooling apparatus, comprising: a thermostat determining a coolant circulation direction according to a coolant temperature; a radiator emitting absorbed heat to atmosphere by expanding contact area of the coolant with air through a core thereof; an electric water pump disposed to pump the coolant and having a controlled operating speed; a coolant temperature sensor configured to detect a coolant temperature; and a control portion that applies an engine speed and fuel consumption amount to determine an operating speed of the electric water pump, and which applies a compensation coefficient to the operating speed, the compensation coefficient being determined according to a coolant temperature, if an engine is operated at high speed or in a high load condition that the heat load thereof is high; wherein the control portion determines whether the engine is in the high speed or in the high load condition, if a rotation speed of the engine exceeds a predetermined first value or the fuel consumption amount exceeds a predetermined second value, respectively, the predetermined first value and the predetermined second value being a minimum engine speed and a minimum fuel consumption amount that are respectively set so as to protect the engine; wherein the control portion operates the electric water pump at regular speed, if an air-conditioner is being operated in a condition that the rotation speed of the engine is less than the minimum engine speed and the fuel consumption amount is less than the minimum fuel consumption amount that are respectively set so as to protect the engine and the coolant temperature detected by the coolant temperature sensor is lower than a predetermined second temperature that the thermostat is opened; and wherein the control portion detects a driving condition and an outside condition of the engine and if an error is detected, the control portion enters into a limp-home mode to operate the electric water pump at predetermined regular speed.