Controlled cooling system for a turbocharged internal combustion engine

• US 5,201,285 A
• Filed: 10/18/1991
• Issued: 04/13/1993
• Est. Priority Date: 10/18/1991
• Status: Expired due to Term

• Current Assignee: MotivePower Investments Limited (Westinghouse Air Brake Technologies Corporation)
• Original Assignee: Touchstone Incorporated
• Inventors: McTaggart, Lester E.
• Primary Examiner(s): Kamen, Noah P.
• Application Number:
  US07/780,708
• Time in Patent Office: 543 Days
• Field of Search: 123/41.02, 123/41.1, 123/41.12, 123/41.29, 123/41.31, 123/41.33, 123/41.51, 123/563, 60/599
• US Class Current: 123/41.31
• CPC Class Codes: F01P 2003/187 arranged in series
• CPC Class Codes: F01P 2023/08 Microprocessor; Microcomputer
• CPC Class Codes: F01P 2025/06 for determining flow
• CPC Class Codes: F01P 2025/13 Ambient temperature
• CPC Class Codes: F01P 2025/32 Engine outcoming fluid temperature
• CPC Class Codes: F01P 2025/50 using two or more temperature sensors
• CPC Class Codes: F01P 2060/02 Intercooler
• CPC Class Codes: F01P 3/20 Cooling circuits not specific to a single part of engine or machine F01P3/22 takes precedence
• CPC Class Codes: F01P 7/04 by varying pump speed, e.g. by changing pump-drive gear ratio
• CPC Class Codes: F01P 7/165 characterised by systems with two or more loops
• CPC Class Codes: F02B 29/0443 Layout of the coolant or refrigerant circuit
• CPC Class Codes: F02B 29/0493 Controlling the air charge temperature
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A controlled cooling system for a turbocharged internal combustion engine having a heat exchange radiator, liquid coolant to absorb heat from the engine, a pump to circulate coolant through the system, a fan to force air in heat exchange with the engine coolant radiator and a radiator for the charge-air after cooler coolant. The cooling and turbocharge system includes a temperature control valve to direct a portion of the liquid coolant discharged from the engine to the radiator and to direct a portion of the liquid coolant to bypass the radiator in response to the temperature of the liquid coolant after discharge from the engine. A liquid subcooler heat exchanger lowers the temperature of the liquid coolant by passing the coolant in heat exchange with forced air from the fan. A flow control valve directs a portion of the liquid coolant discharged from the radiator to the subcooler heat exchanger and the remainder of the liquid coolant to the engine. An aftercooler heat exchanger lowers the temperature of the combustion air discharged from the turbocompressor by passing the combustion air charge in heat exchange with the liquid coolant from the subcooler heat exchanger.

Claims

1. A cooling system for a turbocharged internal combustion engine having heat exchange radiator means, liquid coolant to absorb heat from said engine, pump means to pump said coolant through said cooling system, fan means to force air in heat exchange with said radiator means, and turbocompressor means to increase the density of a combustion air charge, which cooling system comprises:

temperature control valve means to direct a portion of said liquid coolant discharged from said engine to said radiator means and to direct a portion of said liquid coolant to bypass said radiator means in response to the temperature of said liquid coolant after discharge from said engine;

liquid subcooler heat exchange means to lower the temperature of said liquid coolant by passing in heat exchange with forced air from said fan means;

flow control valve means to direct a portion of said liquid coolant discharged from said radiator means to said liquid subcooler heat exchange means and the remainder of said liquid coolant to said engine wherein said flow control valve means includes a flow sensor to sense liquid coolant and signal means in communication with said flow control means to control the portion of coolant to said subcooler means;

aftercooler heat exchange means to lower the temperature of said combustion air charge discharged from said turbocompressor means by passing said combustion air charge in heat exchange with said liquid coolant from said subcooler heat exchange means; and

fan speed control means to control the speed of said fan in response to ambient air temperature and in response to load on said engine.

2. A cooling apparatus for an engine having liquid coolant to absorb heat from said engine, pump means to pump said coolant, which apparatus comprises:

an elongated heat exchange radiator to receive said liquid coolant;

a temperature control valve at one end of said radiator to direct a portion of said liquid coolant discharged from said engine to said radiator and to direct a portion of said liquid coolant to bypass said radiator;

an elongated liquid subcooler parallel and aligned with said radiator, said subcooler in fluid communication with said radiator through a passage from the end of said radiator opposite said temperature control valve to an end of said subcooler;

a flow control valve within said passage to direct a portion of said liquid coolant discharged from said radiator to said subcooler and the remainder to said engine;

a fan to force ambient air in heat exchange with said subcooler and thereafter with said radiator; and

fan speed control means to control the speed of said fan in response to ambient air temperature and in response to load on said engine.