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Cooling system controller and method of controlling cooling system

  • US 10,400,660 B2
  • Filed: 02/20/2014
  • Issued: 09/03/2019
  • Est. Priority Date: 02/20/2014
  • Status: Active Grant
First Claim
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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 at a point between an outlet port of the engine coolant passage and an inlet port of the heat radiator and joins to the coolant passage at a point 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 at the point where the exhaust heat recovery coolant passage branches from the 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, andwherein, the exhaust heat recovery system is arranged in the exhaust heat recovery coolant passage at a point after the exhaust heat recovery coolant passage branches from the coolant passage.

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