JPH10231725A - Operating mechanism of engine cooling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly carry out cooling scavenging after an engine is stopped by operating a cooling fan for a predetermined time by an engine control unit in the case where a water temperature just before an engine key is tuned off is a setting temperature or more. SOLUTION: When an engine key is turned off and an engine is stopped, a water temperature just before it is monitored by an ECU 6 through a water temperature sensor 5. In the case where the water temperature is a setting temperature or more, a cooling fan 7 is operated for a prescribed time by the ECU 6, and scavenging in the engine room 2 is carried out. A setting temperature in this case is decided by finding out a relative relation between the cooling water temperature of the engine 3 and the temperature in the engine room 2 by means of experimentation. The operating time of the cooling fan 7 after the engine key is turned off, is decided by the cooling water temperature monitored by the ECU 6 just before the engine key is turned off. The operating time to be set, extends longer toward the cooling water temperature is raised, and the operating time is regulated by a timer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for operating an engine cooling fan of an automobile.

[0002]

2. Description of the Related Art The engine room of an automobile (1) shown in FIG.
The cooling water of the engine (3) in (2) is cooled by a heat exchanger (radiator) (4). The temperature of the cooling water is detected by a water temperature sensor (5), and the detected value is set at a set temperature. If this is the case, the engine control unit
The cooling fan (7) as an auxiliary cooling means operates via (6).

[0003]

In the above configuration, when the engine brake is turned off and the engine (3) is stopped, the cooling fan (7) does not operate. Therefore, when the engine is stopped, the hot air in the engine room (2) is removed from the vehicle body. It is released from the gap between the panels and the like, so that only natural cooling is performed.
Therefore, it is difficult to scavenge the engine (3) in the engine room (2) after the engine is stopped, and the high temperature condition is maintained for a while, so the parts placed in the engine room (2) are required to ensure reliability. Expensive heat-resistant materials must be used.

[0004]

According to the present invention, as a means for solving the above-mentioned conventional problems, a water temperature is detected by a water temperature sensor (5) of a cooling water of an engine (3), and an engine control unit ( In the mechanism that activates the engine cooling fan (7) via (6), when the engine key is turned off, the water temperature immediately before that is turned on, using the water temperature sensor (5).
The engine control unit (6) monitors the temperature of the water through the engine control unit (6). When the water temperature is higher than the set temperature, the engine control unit (6) activates the cooling fan (7) for a predetermined time. ) Is provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to a specific example shown in FIG. 1. The temperature of cooling water of an engine (3) is detected by a water temperature sensor (5), and the detected value is determined by an engine control unit (ECU). If the detected value is equal to or higher than the set temperature, the cooling fan (7) is operated by the ECU (6).

According to the present invention, in the above conventional mechanism, the ECU
When the engine is turned off by turning off the engine key by adding a program to (6), the water temperature immediately before that is monitored by the ECU (6) via the water temperature sensor (5), and the water temperature is higher than the set temperature. In this case, the cooling fan (7) is operated by the ECU (6) for a predetermined time to scavenge the engine room (2).

The set temperature is determined by finding the correlation between the temperature of the engine cooling water and the temperature in the engine room (2) by experiments. Cooling fan after turning off the engine key
The operating time of (7) is determined by the temperature monitored by the ECU (6) immediately before the key-off. That is, if the temperature is high, the operation time is set longer. The operation time of the cooling fan (7) is adjusted by a timer.

The present invention is also applied to a midship type automobile (11) as shown in FIG. In this case, in addition to the cooling fan (17) arranged behind the radiator (14), a scavenging fan (18) is arranged below the engine room (12) where the engine (13) is arranged. The cooling fan (17) detects the engine cooling water temperature by the water temperature sensor (15) and is operated by the ECU (16) .If the temperature immediately before the key-off is equal to or higher than the set temperature, it is operated for a predetermined time after the key-off. Can be Further, the temperature in the engine room (12) is detected by a temperature sensor (19), and when the detected value is equal to or more than a predetermined value, the scavenging fan (18) is operated by the control amplifier (20). The scavenging fan (18) may also be operated for a predetermined time after key-off.

[0009]

According to the present invention, when the temperature of the engine room becomes high, the cooling fan operates for a while even if the engine key is turned off and the engine is stopped. Cooling and scavenging are performed smoothly, and components arranged in the engine room do not need to have high heat resistance, and inexpensive components can be used.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an ordinary automobile.

FIG. 2 is an explanatory view of a midship-type automobile.

[Explanation of symbols]

 1,11 Car 2,12 Engine room 3,13 Engine 4,14 Radiator 5,15 Water temperature sensor 6,16 Engine control unit (ECU) 7,17 Cooling fan

Claims (1)

[Claims] When the engine key is turned off in a mechanism for detecting a water temperature by a water temperature sensor of an engine cooling water and operating the engine cooling fan via an engine control unit based on the detected value, the water temperature immediately before the engine key is turned off is set to the water temperature An engine control unit that monitors the engine via a sensor and, when the water temperature is equal to or higher than a set temperature, operates the cooling fan for a predetermined time by the engine control unit;