KR19990025470A - Engine overheat prevention device and control method - Google Patents

Abstract

The present invention relates to an engine overheating prevention device and a control method for preventing overheating of an engine due to lack of coolant and overload, and a radiator into which the coolant discharged from an engine kit is introduced, and the radiator flows into the radiator. A cooling device of a vehicle comprising a cooling fan for cooling the coolant, and a coolant pump for circulating the coolant in a coolant circulation pipe connecting the kit and the radiator of the engine, comprising: a sensor unit for detecting an overload state of the engine; And a cooling water auxiliary tank installed in a bypass pipe bypassing one end of the cooling water circulation pipe and storing a predetermined amount of cooling water, and selectively opening and closing one end and the bypass pipe of the cooling water circulation pipe to cool the water in the cooling water auxiliary tank. The valves for intermittent circulation and the valves according to information input from the sensor unit. And characterized by providing the cooling fan and the engine and thermal protection apparatus applied thereto engine overheat protection control device comprising a control module for controlling the coolant pump.

Description

Engine overheat prevention device and control method

The present invention relates to an engine overheating prevention device for a vehicle and a control method thereof. More specifically, a bypass pipe for bypassing one end of the cooling water circulation pipe is installed at one end of the cooling water circulation pipe, and a predetermined amount of cooling water is stored in the bypass pipe. An auxiliary tank for opening and closing the bypass pipe and a direct valve for opening and closing one end of the circulation pipe to control the operation of the bypass valve and the direct valve when the engine reaches an overheated state. The present invention relates to an engine overheating prevention device and a method of controlling the same, which can prevent overheating of an engine due to lack of cooling water and overload.

In general, the engine of an automobile is an overheated state during continuous operation due to friction generated as a piston reciprocates a cylinder and combustion heat generated when fuel is combusted, thereby cooling the engine using a circulation of cooling water. Cooling device is provided.

1, when the engine 101 is driven, the coolant pump 110 is driven to circulate the coolant of the coolant tank 111 through the coolant circulation pipe 112. At this time, the cooling water circulated in the cooling water circulation pipe 112 is introduced into the kit of the engine 101 to absorb heat around the cylinder to cool the engine 101, and the cooling water absorbing the engine 101 heat is a radiator. It is sent to 113 and cooled to a predetermined temperature while dissipating heat. Thus, when the temperature of the cooling water sent to the radiator 113 is higher than the set value, the cooling fan 114 is driven to help the heat dissipation of the radiator 113.

However, the vehicle engine cooling apparatus as described above does not perform the cooling operation of the engine smoothly when the cooling fan is abnormal or overload, the engine overheating prevention device has been developed in the past.

As a conventional engine overheat prevention apparatus, a method described in Korean Patent Laid-Open No. 97-44538 is known, which is briefly described as follows.

As shown in FIG. 2, the conventional engine overheat prevention device cools the coolant flowing into the radiator 6 while rotating according to the operation of the radiator 6 and the cooling fan motor 12 in which the coolant discharged from the engine is introduced. In the cooling device of a vehicle composed of a cooling fan (15), the controller 16 is a cooling fan motor drive signal (S1) for detecting the operating state of the cooling fan motor 12 and the cooling water temperature in the radiator (6) Based on the detected coolant temperature signal S2 and the vehicle speed signal S3, when the cooling fan 13 is not operated when the vehicle speed is higher than the prescribed value, the fuel injection quantity limit signal S1 'is sent to output the engine 2. It is comprised so that the overheating of an engine can be prevented by lowering.

However, the engine overheating prevention device of the conventional vehicle was able to prevent overheating of the engine by automatically reducing the fuel injection amount by lowering the output of the engine when the cooling fan failed, but the engine is overloaded, or the coolant If there is a shortage there is a problem that can not prevent overheating of the engine.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide an engine overheating prevention device and a control method thereof, which can prevent overheating of an engine due to lack of cooling water and overload.

1 is a schematic perspective view showing an engine cooler of a typical vehicle

Figure 2 is a block diagram showing a conventional engine overheat prevention device

Figure 3 is a schematic perspective view showing an engine overheating prevention device according to an embodiment of the present invention

Figure 4 is a block diagram showing the configuration of the engine overheat prevention device according to an embodiment of the present invention

5 is a flow chart showing the operation according to an embodiment of the present invention

Explanation of symbols on the main parts of the drawings

201: engine 210: control module

212: A / C switch 213: vehicle speed sensor

214: coolant temperature sensor 215: PRM sensor

220: cooling water pump 222: circulation pipe

224 cooling fan 225 direct valve

230: bypass pipe 231: auxiliary tank

233, 234: bypass valve

The present invention for achieving the above object, a radiator to which the coolant discharged from the kit of the engine is introduced, a cooling fan for cooling the coolant introduced into the radiator, connecting the kit and the radiator of the engine A cooling apparatus of a vehicle, comprising a cooling water pump for circulating cooling water in a cooling water circulation pipe, comprising: a sensor unit for detecting an overload state of an engine and a bypass pipe bypassing one end of the cooling water circulation pipe; Cooling water auxiliary tank for storing the valve, one end of the cooling water circulation pipe and the bypass pipe to selectively open and close the cooling water circulation of the cooling water auxiliary tank and the valves according to the information input from the sensor unit And a control module for controlling the cooling fan and the cooling water pump. .;

A first process of determining an overload state of the engine, a second process of determining whether an hourly coolant temperature deviation is greater than an hourly critical temperature deviation when the engine is determined to be in an overloaded state, and a second coolant temperature of the second process And a third step of circulating the coolant in the coolant auxiliary tank by closing the direct valve and opening the bypass valve when the deviation is determined to be equal to or more than the critical temperature deviation of the coolant temperature per hour. do.

Hereinafter, an embodiment of the present invention will be described in more detail based on the accompanying drawings.

3 and 4 show the configuration of the engine overheat prevention apparatus according to an embodiment of the present invention, the radiator 223 to which the coolant discharged from the kit of the engine 201 is introduced, and the radiator 223 flows into the radiator 223. Cooling fan 224 for cooling the cooling water, and the coolant pump 220 and the cooling water for circulating the cooling water in the cooling water circulation pipe 222 connecting the kit and the radiator 223 of the engine 201 It is applied to a cooling device of a vehicle composed of a cooling water tank (221).

Accordingly, the present invention, the sensor unit 211 for detecting an overload state of the engine 201 and the bypass pipe 230 that bypasses one end 222a of the coolant circulation pipe 222 is small Cooling water circulation of the cooling water auxiliary tank 231 by selectively opening and closing the cooling water auxiliary tank 231 for storing a predetermined amount of cooling water, one end 222a of the cooling water circulation pipe 222 and the bypass pipe 230. Further comprising a control module 210 for controlling the valves, the valves, the cooling fan 224 and the coolant pump 220 according to the valves intermittent and the information input from the sensor unit 211. It is composed.

The sensor unit 211 detects a coolant temperature in the A / C switch 212 for outputting a signal according to an air conditioner operating state, a vehicle speed sensor 213 for detecting and outputting a vehicle speed, and the engine 201 water jacket. It consists of a cooling water temperature sensor 214 and the RPM sensor 215 to detect and output the rpm of the engine 201, the valves are bypass valves 233 for opening and closing the bypass pipe 230 234 and a direct valve 225 that opens and closes one end portion 222a of the circulation pipe 222.

That is, the control module 210 opens the bypass valves 233 and 234 when the information input from the sensor unit 211 during the engine 201 driving process indicates the engine 201 overload state. The bypass pipe 230 communicates with the circulation pipe 222 and the direct valve 225 is closed to allow the cooling water flowing through the bypass pipe 230 to pass through the bypass pipe 230. The coolant of the tank 231, that is, the coolant in a non-heated state, flows into the engine 201 through the circulation pipe 222, and controls the coolant pump 220 and the cooling fan 224 at high speed.

As illustrated in FIG. 5, an operation according to an embodiment of the present invention configured as described above will be described according to an operation control process of the control module 210.

The control module 210 determines whether the engine 201 is driven in step S101, and when the engine 201 is driven as a result of the determination, the engine 201 is overloaded by going through steps S102 to S105. If it is determined that the application, in detail the process, first proceeds to step S102 to detect the engine rpm through the RPM sensor 215. At this time, the control module 210 determines whether the detected engine rpm is greater than or equal to the threshold rpm, and proceeds to step S103 when the detected engine rpm is greater than or equal to the threshold rpm. In step S103, the coolant temperature sensor 214 detects the coolant temperature in the engine kit 201 and determines whether the detected coolant temperature is higher than or equal to the threshold temperature. If the detected coolant temperature is higher than or equal to the threshold temperature, step S104. Proceed. In step S104, it is determined whether the air conditioner is turned on through the A / C switch 212. If the air conditioner is turned on as a result of the determination, the process proceeds to step S105, and the vehicle speed sensor 213 is detected. Next, the control module 210 determines whether the detected vehicle speed is greater than or equal to the threshold speed, that is, whether the engine 201 is finally overloaded.

On the other hand, if the vehicle speed is greater than or equal to the threshold speed in step S106, the engine 201 determines that it is in an overload state, and proceeds to step S106 to detect the coolant temperature deviation per hour, and is the detected coolant temperature deviation greater than or equal to the threshold temperature deviation per hour? If it is determined that the detected hourly cooling water temperature deviation is equal to or more than the cooling water temperature critical temperature deviation, step S107, step S108 and step S109 are sequentially performed, and the process is as follows.

First, the control module 210 closes the direct valve 225 and opens the bypass valves 233 and 234 in step S107 to cool the engine through the circulation pipe 222 to cool the coolant in the coolant auxiliary tank 231. By circulating in a line, the cooling fan 224 and the cooling water pump 220 installed in the radiator 223 are driven at a high speed to increase the circulation rate of the cooling water and to smoothly generate heat in the radiator 223. At this time, since the cooling water of the cooling line of the engine 201 is a state in which the cooling water of the non-heated state is mixed, the engine 201 is smoothly cooled and the cooling water is replenished from the auxiliary tank 231, thereby overheating the engine 201. It can be prevented.

As described above, the present invention provides a bypass pipe for bypassing one end of the cooling water circulation pipe, and an auxiliary tank for storing a predetermined amount of cooling water in the bypass pipe. By installing a bypass valve for opening and closing and a direct valve for opening and closing one end of the circulation pipe to control the operation of the bypass valve and the direct valve when the engine reaches an overheated state, the coolant is insufficient and the overload, in particular, due to the operation of the air conditioner Overheating of the engine can be prevented.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention as set forth in the claims. Anyone can see it easily.

Claims (6)

A radiator 223 into which the coolant discharged from the kit of the engine 201 flows, a cooling fan 224 for cooling the coolant introduced into the radiator 223, a kit of the engine 201 and the radiator In the cooling device of the vehicle consisting of a coolant pump 220 for circulating the coolant in the coolant circulation pipe 222 connecting 223, the sensor unit 211 for detecting an overload state of the engine 201, and A cooling water auxiliary tank 231 installed in the bypass pipe 230 bypassing one end 222a of the cooling water circulation pipe 222 and storing a predetermined amount of cooling water, and one end of the cooling water circulation pipe 222 ( 222a and valves for selectively opening and closing the bypass pipe 230 to control the cooling water circulation of the cooling water auxiliary tank 231, and the valves and the cooling fan according to information input from the sensor unit 211. 224 and a control module for controlling the coolant pump 220 Engine overheating prevention device comprising a (210). The air conditioner of claim 1, wherein the sensor unit 211 includes an A / C switch 212 for outputting a signal according to an air conditioner operating state, a vehicle speed sensor 213 for detecting and outputting a vehicle speed, and the engine 201. And a coolant temperature sensor (214) for sensing and outputting the coolant temperature in the kit and an RPM sensor (215) for sensing and outputting the rpm of the engine (201). The valve of claim 1, wherein the valves include bypass valves 233 and 234 for opening and closing the bypass pipe 230, and a direct valve 225 for opening and closing one end portion 222a of the circulation pipe 222. Engine overheat prevention device comprising a. A first process of determining an overload state of the engine 201, a second process of determining whether the cooling water temperature deviation per hour is greater than or equal to a threshold temperature deviation per hour if the engine 201 is determined to be in an overloaded state in the first process, and If it is determined in step 2 that the cooling water temperature deviation per hour is greater than the cooling water temperature threshold temperature deviation, the direct valve 225 is closed and the bypass valves 233 and 234 are opened to circulate the cooling water of the cooling water auxiliary tank 231. The engine overheat prevention device control method comprising a third process. The method of claim 4, wherein the first process comprises: a first step of determining whether the engine rpm detected from the RPM sensor 215 is greater than or equal to the threshold rpm, and the coolant temperature when the engine rpm detected in the first step is greater than or equal to the critical rpm; A second step of determining whether the coolant temperature detected by the sensor 214 is greater than or equal to the critical error; a third step of determining whether the air conditioner is turned on when the coolant temperature detected in the second step is greater than or equal to the threshold temperature; And a fourth step of determining whether the vehicle speed detected from the vehicle speed sensor 213 is greater than or equal to the threshold speed when the air conditioner is turned on in the third step. The method of claim 4, wherein the third process further comprises driving the cooling fan (224) and the cooling water pump (220) at high speed.