KR100507095B1 - Method for cooling fan control of vehicle - Google Patents

Abstract

By communicating between the trip computer and the ECU in the vehicle, instantaneous engine load information is read and the driving of the cooling fan is controlled according to the degree of load.

Determining whether the cooling water temperature sensor and the vehicle speed sensor are malfunctioning when the engine is started on; and if the cooling water temperature sensor and the vehicle speed sensor are normal, normal cooling fan control is performed, and the cooling water temperature sensor and the vehicle speed are performed. If the sensor is broken, the process of reading the instantaneous fuel consumption information from the trip computer connected to the network in real time, the process of determining the variation of the engine load from the instantaneous fuel consumption information read from the trip computer and the determination And controlling the driving of the cooling fan according to the variation of the engine load.

Description

Vehicle cooling fan control method {METHOD FOR COOLING FAN CONTROL OF VEHICLE}

The present invention relates to a control of a cooling fan of a vehicle. More particularly, the present invention relates to a control of a cooling fan according to a load level by reading an instantaneous engine load of a vehicle through communication between a trip computer and an ECU. It relates to a cooling fan control method.

The temperature of the coolant, which prevents the engine from overheating in the vehicle and maintains the optimum temperature and maintains the optimum engine conditions, is controlled by the cooling fan, and the driving and speed of the cooling fan are controlled by the signal of the cooling water temperature sensor. It is done.

However, when the cooling water temperature sensor fails or a normal signal is not detected by the ECU, the ECU is in a state in which the current cooling water temperature is unknown. Therefore, the cooling fan is always driven at the highest speed to prevent the engine from overheating.

When the cooling fan is always driven at the highest speed, there is a problem in that the charge and discharge characteristics of the battery are lowered, thereby shortening the battery life and not being able to supply stable power to each load in the vehicle, thereby maintaining a stable engine state.

In addition, the noise and vibration of the motor is excessively generated to reduce the reliability to the driver, the problem of shortening the life of the motor occurs.

As a way to improve this, the method of controlling the cooling fan's operation at low, medium and high speeds is applied according to the vehicle speed to be read when the cooling water temperature sensor fails.In this case, if the vehicle speed sensor fails, Similarly, the cooling fan is driven at high speed.

In order to compensate for the disadvantages of using the signals of the cooling water temperature sensor and the vehicle speed sensor as described above, the engine speed is detected using the signal of the crank angle sensor or the cam sensor, and then the final gear ratio of the transmission is calculated to calculate the How to adjust the driving speed, detect the vehicle speed by using the signal of the wheel speed sensor, and then adjust the driving speed of the cooling fan accordingly, and install a new device to detect the cooling water temperature when the cooling water temperature sensor fails. And the like are presented.

However, in the application of the method described above, the cooling fan drive control according to the engine speed and the final gear ratio requires an additional device for knowing the gear ratio in the case of a vehicle equipped with a manual transmission, resulting in an additional cost increase. There is a disadvantage.

The present invention has been invented to solve the above problems, the purpose of which is to provide a trip to the vehicle without the additional sensor or device in preparation for the failure of the cooling water temperature sensor and the vehicle speed sensor to control the driving of the cooling fan. Through the communication between the computer and the engine controller, real-time fuel consumption information is provided to determine instantaneous fluctuations in the engine load to control the driving of the cooling fan according to the load level.

The present invention for realizing the above object is a process for determining whether the cooling water temperature sensor and the vehicle speed sensor is a failure when the engine start is maintained on; Normal cooling if the cooling water temperature sensor and the vehicle speed sensor is normal Performing fan control, and reading the instantaneous fuel consumption information from a trip computer connected to the network in real time when the cooling water temperature sensor and the vehicle speed sensor are broken; from the instantaneous fuel consumption information read from the trip computer; And determining a change in engine load; and controlling driving of a cooling fan according to the determined change in engine load.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As can be seen in FIG. 1, a cooling fan control apparatus for a vehicle according to the present invention includes a trip computer 10 and an ECU 20 connected thereto via a network.

The trip computer 10 detects and instructs the mileage of the vehicle, detects fuel consumption instantaneously, calculates fuel economy, detects and instructs the current remaining fuel amount, and calculates and displays a distance that can be driven using the current fuel amount. do.

The ECU 20 analyzes various types of information received through the network connected to the trip computer 10 and applies it to the control of the vehicle, and when the water temperature sensor and the vehicle speed sensor detecting the coolant temperature are determined to be faulty, the trip computer ( The control of the cooling fan is controlled by determining the load variation from the set table for the instantaneous fuel consumption provided in real time in 10) .In other words, when the instantaneous fuel consumption is higher than the set reference value, the load is greatly generated due to acceleration. The operation of performing the cooling fan drive control by applying the configuration of the present invention including the above function will be described as follows.

delete

When the routine for controlling the cooling fan is started, the ECU 20 detects information of the cooling water temperature sensor of the vehicle, information about the vehicle speed, and information of the trip computer 10 through the network (S101), and the engine start of the vehicle is turned on. It is determined whether to maintain (S102).

If the engine start of the vehicle is in the off state, the routine for controlling the cooling fan is not performed. If the engine is kept on, it is determined whether the sensors of the cooling water temperature sensor and the vehicle speed sensor are not detected. (S103).

If it is determined that the coolant temperature sensor and the vehicle speed sensor are in a normal state, normal control is performed, and if it is determined that the coolant temperature sensor and the vehicle speed sensor are in a faulty state, real-time instantaneous fuel consumption from the trip computer 10 through the network is detected. Is detected (S105).

Subsequently, a change in engine load is determined by applying a table set to the instantaneous fuel consumption detected in real time by the trip computer 10 (S106). If it appears to be large, it is determined that the engine is in a state of high engine speed that requires acceleration or operation of the air conditioner system, low gear, or high torque. Appropriate cooling fan drive is performed (S107).

As described above, according to the present invention, when the cooling water temperature sensor and the vehicle speed sensor fail, the instantaneous fuel consumption is detected from the trip computer to determine the load change of the engine, and then the driving of the cooling fan is controlled to effectively control the cooling fan. The engine prevents engine overheating, optimizes the operation of the cooling fan motor, eliminates noise and vibration, extends the motor life, improves durability, and improves marketability.

1 is a schematic configuration diagram of a cooling fan control apparatus of a vehicle according to the present invention.

2 is a flow diagram of one embodiment for performing cooling fan control of a vehicle in accordance with the present invention.

Claims (1)

Determining whether the coolant temperature sensor and the vehicle speed sensor are broken when the engine start is maintained on; If the cooling water temperature sensor and the vehicle speed sensor is normal, the normal cooling fan control is performed, and if the cooling water temperature sensor and the vehicle speed sensor are broken, the process of reading the instantaneous fuel consumption information from the trip computer connected to the network in real time; ; Determining a change in engine load from the instantaneous fuel consumption information read by the trip computer; And controlling the driving of the cooling fan according to the determined change in the engine load.