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Engine cooling system for vehicle

a technology for cooling systems and engines, applied in the direction of engine cooling apparatus, machines/engines, mechanical equipment, etc., can solve the problems of reduced drive power of cooling fans, short cooling fan time, and limited effect of cooling fans

Inactive Publication Date: 2008-05-22
DAIDO METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is an engine cooling system for a vehicle that reduces power required for cooling by assisting the pump motor with the cooling fan. The system includes a water pump for circulating liquid coolant of the engine, a radiator for cooling the liquid coolant, and a cooling fan for cooling the radiator. The cooling fan is driven by the pump motor and can be connected or disconnected based on the temperature of the liquid coolant and the assist ability of the cooling fan. The system helps to reduce power consumption and improve cooling efficiency.

Problems solved by technology

However, in the prior art examples 1, 2 and 3 and especially in the prior art examples 2 and 3 of JP-A-2002-97956 and in JP-A-2002-97956, the cooling fan is reduced in its drive power since it receives the rotational force from the driving wind, but its effect is limited to the time when the cooling fan is driven.
Considering that the required operating time of the cooling fan is short as described above, the substantial effect of the driving wind is small.

Method used

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Examples

Experimental program
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first embodiment

[0041]Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 2 schematically shows a configuration of a cooling system of an engine, for example, a gasoline engine, as a propulsion source of a vehicle. As shown in FIG. 2, a jacket 2 is formed in an engine 1, and cooling of the engine 1 is performed by liquid coolant passing inside the jacket 2. The engine cooling system is a system which cools the engine 1 by circulating the liquid coolant, of which temperature has risen by cooling the engine 1, and which is cooled outside and returned to the engine 1 again, and includes a radiator 3, a cooling fan 4, a water pump 5 and a pump motor 6 which drives the water pump 5.

[0042]The above described pump motor 6 is fixed to a support frame 7 mounted to a rear portion of the radiator 3. The pump motor 6 is constituted of, for example, a brushless DC motor, and includes a stator 9 fixed to a motor case 8, and a rotor 11 rotatably supporte...

second embodiment

[0064]FIGS. 6 and 7 show a second embodiment of the present invention. The point in which the second embodiment differs from the above described first embodiment is that the presence or absence of the assist ability of the cooling fan 4 is determined by comparing the rotational speed of the cooling fan 4 and the rotational speed of the pump motor 6.

[0065]Specifically, in this embodiment, the vehicle speed sensor 34 is not included as shown in FIG. 6, and instead of this, a rotational speed sensor 38 as a fan rotational speed detecting means for detecting the rotational speed of the cooling fan 4. Although it is not shown, the rotational speed sensor 38 is constituted of a permanent magnet provided at the cooling fan 4, for example, and a magnetism detecting element such as a hall element provided at the support frame 7, for example, for detecting the magnetism of the permanent magnet, and the magnetism detecting element outputs the number of pulses corresponding to the rotational sp...

third embodiment

[0068]FIG. 8 shows a third embodiment of the present invention. This embodiment differs from the above described second embodiment in the point that presence or absence of the assist ability of the cooling fan 4 is determined by calculating the rotational speed of the cooling fan 4 due to the driving wind from the driving speed of the vehicle, and by comparing the calculated rotational speed of the cooling fan 4 and the rotational speed of the pump motor 6. Accordingly, in this embodiment, the rotational speed sensor 38 in the second embodiment is not included, but the vehicle speed sensor 34 in the first embodiment is included instead.

[0069]Specifically, when determining whether or not the cooling fan 4 has the assist ability, the control circuit 32 obtains the detected speed of the vehicle speed sensor 34 (step a4 in FIG. 8), and calculates the rotational speed of the cooling fan 4 due to the driving wind based on the detected speed (step a5). The detected speed (speed of the vehi...

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PUM

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Abstract

In order to reduce driving power of an engine cooling system in which a cooling fan for cooling a radiator and a water pump are driven by a motor, according to the invention, a pump motor of the water pump 5 which circulates liquid coolant is used as a drive source of the cooling fan. An electromagnetic clutch is provided between the pump motor and the cooling fan, and when the liquid coolant exiting from an engine is at a predetermined temperature or higher, the electromagnetic clutch is brought into a connected state, whereas when the liquid coolant is at a temperature lower than the predetermined temperature, the electromagnetic clutch is brought into a disconnected state. When the liquid coolant is at a temperature lower than the predetermined temperature, and the vehicle speed is at a predetermined speed or higher, the electromagnetic clutch is brought into a connected state, and a rotational force of the cooling fan receiving driving wind is transmitted to the pump motor to reduce its load.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an engine cooling system for a vehicle having the structure in which liquid coolant of an engine is cooled by a radiator, and particularly to an engine cooling system in which a cooling fan for cooling the radiator is driven by a motor of a water pump for circulating the liquid coolant.[0003]2. Description of Related Art[0004]In a cooling system of an engine of a vehicle, liquid coolant is basically circulated in such a manner that the liquid coolant of which temperature rises as a result of cooling the engine is fed by a water pump to a radiator, where the cooling water is cooled by wind during running and by air blowing from a cooling fan, and thereafter, the liquid coolant is returned to the engine again.[0005]The cooling of the engine is performed for the purpose of preventing overheating, but if the engine is excessively cooled, thermal loss of the engine increases, and mechanical l...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01P7/14
CPCF01P5/04F01P2005/046F01P7/084F01P5/12
Inventor KAWAIKE, KAZUHIKOKOUSHIMA, MOTOHIKOHANAHASHI, MINORUNAGATA, MARI
Owner DAIDO METAL CO LTD