COOLING SYSTEM CONTROLLER AND METHOD OF CONTROLLING COOLING SYSTEM

摘要

A cooling system controller controls a cooling system at least having a coolant pump (3) configured to supply a coolant to an internal combustion engine, a heat radiator (9) configured to cool the coolant, and an exhaust heat recovery system (6) configured to perform in heat exchange between the exhaust gas and the coolant. In addition, the cooling system controller (12) has a unit configured to control the coolant flow rate, a unit (13) configured to obtain a coolant temperature or pressure of the internal coolant passage of the engine, and a unit configured to obtain an internal coolant temperature or pressure of the exhaust heat recovery system. Furthermore, the coolant flow rate is restricted at a cold start of the internal combustion engine, and the restriction of the coolant flow rate is released on the basis of the coolant temperature or pressure of the engine coolant passage and the internal coolant temperature or pressure of the exhaust heat recovery system.

主权项

1: A cooling system controller that controls a cooling system at least having a coolant pump configured to supply a coolant to an engine coolant passage provided in an internal combustion engine, a heat radiator configured to radiate heat from the coolant passing through the engine coolant passage to the external air to lower a temperature of the coolant, and an exhaust heat recovery system configured to perform heat exchange from an exhaust gas of the internal combustion engine to the coolant, the cooling system controller comprising:
a coolant passage that links the engine coolant passage and the heat radiator; an exhaust heat recovery coolant passage that branches from the coolant passage between an outlet port of the engine coolant passage and an inlet port of the heat radiator and joins to the coolant passage between an outlet port of the heat radiator and an inlet port of the engine coolant passage, the exhaust heat recovery system being arranged in the exhaust heat recovery coolant passage; a multi-flow control valve disposed in a branching portion of the coolant passage to the exhaust heat recovery coolant passage and configured to select a coolant flow passage out of the coolant passage and the exhaust heat recovery coolant passage; and a coolant flow rate control unit that controls a coolant flow rate flowing through the cooling system, wherein the coolant flow rate control unit controls the coolant flow rate flowing through the cooling system by switching a coolant flow passage by using the multi-flow control valve.