KR100218720B1 - Lock-up clutch control method - Google Patents

Abstract

The present invention relates to a lockup clutch control method for a vehicle equipped with an automatic transmission that improves fuel efficiency because a lockup clutch is controlled using a substitute function even when a signal of an engine speed line is not input. The number of revolutions (NE), the input shaft revolutions (NT) of the turbine, the speed of the vehicle (Vo), the opening degree (TH) of the throttle valve, and the positions of the P, R, N, D, 2, L of the inhibitor switch A step (step 1) detected by the control unit, a step (step 2) of checking the forward positions of the inhibitor switches in order to check for abnormalities in the engine speed line (step 2), and Checking whether the set value is higher than the set value (step 3), and checking whether the current engine speed is higher than the set value, and if it is normal, enable / disable the lockup clutch by the engine speed, turbine speed, and throttle valve opening relationship. Step (step 4), the current engine speed In case of abnormality, the result of judging the set value of engine speed and turbine speed is judged to maintain the set value for 5 seconds, and if it is normal, the lock-up clutch is operated / released by the relationship between the opening of the throttle valve and the speed of the vehicle. A lockup clutch control method for a vehicle with an automatic transmission in step (step 5).

Description

Lock-up clutch control method for vehicles with automatic transmission

1 is a main flow chart of the present invention.

2 is a branch flow chart showing the relationship between the engine speed, turbine speed and throttle valve opening of the present invention.

Figure 3 is a branch flow chart showing the relationship between the throttle valve and the vehicle speed of the present invention.

4 is a graph showing the operating area relationship between the engine speed or turbine speed and the throttle valve opening of the present invention.

5 is a graph showing the operating area relationship between the vehicle speed and the throttle valve opening of the present invention.

6 is a graph showing a comparison of slip amount and operating pressure when using a conventional lock-up clutch.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock up clutch installed in a torque converter for improving fuel efficiency of a vehicle equipped with an automatic transmission, and in particular, even when a signal of an engine speed line is not input. The present invention relates to a lockup clutch control method for a vehicle with an automatic transmission that improves fuel efficiency by controlling a lockup clutch using a substitute function.

Conventionally, in the automatic transmission vehicle equipped with the lock-up clutch, the hydraulic pressure is operated to be proportional to the difference by using the difference between the engine speed and the turbine speed (input shaft) in the operation of the lock-up clutch. The lockup clutch was turned on / off.

In other words, the fuel economy reduction problem in vehicles with automatic transmission is one of the most important improvements by applying the lock-up clutch, but it is often determined by the engine speed or the turbine speed.

This is because the engine speed and the turbine speed difference are controlled as a countermeasure against the operation of the lock-up clutch.

If the engine speed line fails, the lock-up clutch control becomes impossible and in this case releases the lock-up clutch.

That is, although the engine speed NE and the turbine speed NT (input shaft) are important, when the engine speed line is disconnected, control becomes impossible.

In other words, it is the basic to control that the value of NE-NT comes to a certain value. If there is no engine speed (NE), only the value of turbine speed (NT) exists, so the slip amount becomes (-). do.

The concept is that, as shown in FIG. 6, a large slip amount means a low operating pressure, and a small slip amount means a large operating pressure. Therefore, the slip amount can be sensed to control and control the operating pressure of the lock-up clutch. Will be.

However, due to the failure of the engine speed (NE) line, it is impossible to control the turbine speed and disconnection, so that the lock-up clutch is not controlled and is always released, thereby adversely affecting fuel economy.

The present invention is to solve the conventional problems, the lock-up clutch control method of a vehicle with an automatic transmission to improve the fuel economy by using the alternate signal to control the lock-up clutch even if the signal of the engine speed line is not input. The purpose is to provide.

In order to achieve the above object, the present invention provides an engine speed NE, an input shaft speed NT of a turbine, a speed Vo of a vehicle, an opening degree of a throttle valve, and a P of an inhibitor switch. Detecting the positions of R, N, D, 2, L by the electronic control unit, checking the advance positions of D, 2, L of the inhibitor switch to check for abnormalities in the engine speed line, and Check whether the input shaft rotation speed of the turbine is higher than the set value, and if the engine speed is higher than the preset value, and if it is normal, operate the lock up clutch according to the engine speed, turbine speed and the throttle valve opening relationship. And if the current engine speed is abnormal, the result of judging the set value of the engine speed and the turbine speed is judged to maintain the set value for 5 seconds, and if it is normal, the lock is determined by the relationship between the opening of the throttle valve and the speed of the vehicle. Up clutch The lock-up clutch control method for copper / a in the step of ever releasing the automatic transmission equipped vehicles is a fundamental feature of the invention.

Checking whether the current engine speed is above the set value and detecting the engine speed, turbine speed and throttle valve opening relationship if it is normal, and receiving the detection signals of the engine speed, turbine speed and throttle valve opening relationship It is an additional feature of the present invention to determine whether or not the area, and to enable / disable the lock-up clutch in the lock-up area.

Determining whether the set value of the engine speed and the turbine speed is maintained for 5 seconds when the engine speed is abnormal, and detecting the opening degree of the throttle valve and the speed of the vehicle when the speed is normal. It is an additional feature of the present invention to determine whether the lockup area is received based on the detection signal of the opening degree of the vehicle and the vehicle speed, and to enable / disable the lockup clutch in the lockup area.

Hereinafter, a lockup clutch control method of an automatic transmission equipped vehicle according to the present invention will be described.

1 is a main flowchart for implementing the control of the present invention, the engine rotation speed (NE), the input shaft rotation speed (NT) of the turbine, the vehicle speed (Vo), the opening degree (TH) and the hibi The electronic control unit detects the positions of the P, R, N, D, 2, and L of the rotor switch (step 1), and the D, 2, L of the inhibitor switch to check for abnormalities in the engine speed line. Checking the forward position (step 2), checking whether the current shaft speed of the turbine is greater than or equal to the set value (step 3), and checking whether the current engine speed is greater than or equal to the set value. Set the lock-up clutch to be activated / deactivated by the rotational speed and the throttle valve opening relationship (step 4), and set the result of judging the set value of the engine speed and the turbine speed when the engine speed is abnormal for 5 seconds. Determine if the value is maintained and open the throttle valve if it is normal. And a lock-up clutch control method of the steps of ever activate / deactivate the lock-up clutch by the speed relationship of the vehicle (5) the automatic transmission in the vehicle fitted.

2 is a branch flow chart in which the main flow chart is embodied. The step of detecting the engine speed, the turbine speed and the throttle valve opening relationship when the engine speed is normal by checking whether the current engine speed is higher than the set value (step 6) and the engine Determining whether the lockup area is received by receiving detection signals of the rotational speed, turbine speed, and throttle valve opening relationship (step 7); and enabling / disabling the lockup clutch in the lockup area (step 8). will be.

3 is a branch flow chart in which the main flow chart is embodied. When the engine speed is abnormal, it is determined whether the set value of the engine speed and the turbine speed is maintained for 5 seconds. Detecting the opening degree and the speed relationship of the vehicle (step 9), determining whether the lockup area is received by receiving the detection signal of the opening degree of the throttle valve and the vehicle speed relationship (step 10), and locking up at the lockup area To activate / deactivate the clutch (step 11).

The lock-up clutch control method of the automatic transmission equipped vehicle of the present invention will be described as follows.

Step 1 includes the engine speed NE, the turbine speed NT, the vehicle speed Vo, the opening of the throttle valve, and the positions of the P, R, N, D, 2, and L of the inhibitor switch. Is detected by the electronic controller.

Step 2 checks the advance positions of D, 2 and L of the inhibitor switch in order to check for abnormalities in the engine speed line.

Step 3 checks whether the current shaft speed of the turbine is greater than or equal to the set value, and if the set value is lower, returns to the main routine.

Step 4 checks whether the current engine speed is greater than or equal to the set value, and if normal, enables / disengages the lock-up clutch by the engine speed, turbine speed, and throttle valve opening relationship.

4 shows an example of determination based on the engine speed or turbine speed and the throttle valve opening relationship. If it is determined in step 5 that the engine speed has failed, the process branches to step 6.

That is, after checking whether the current engine speed is greater than or equal to the set value and detecting the engine speed, the turbine speed, and the throttle valve opening relationship as shown in FIG. 2, the engine speed, the turbine speed, and the throttle are detected. In response to the detection signal of the valve opening relationship, it is determined whether the lockup area is the lockup area (step 7), and if it is not the lockup area, it is returned to the main routine. When the lockup area is determined, the lockup clutch is activated (step 8). Lock-up control.

If the engine speed is less than the set value, the lockup clutch cannot be operated / disabled due to the engine speed, turbine speed, and throttle valve opening, and the engine speed line is detected and the process proceeds to step 5.

Step 5 is to determine whether the set value of the engine speed and turbine speed is maintained for 5 seconds when the current engine speed is abnormal, and when the engine speed is normal, by the relationship between the opening of the throttle valve and the speed of the vehicle. Enable / disable the lockup clutch.

This case is determined by the decision graph as shown in FIG. 5 by the vehicle speed and the throttle valve opening relationship.

That is, as shown in FIG. 3 when the current engine speed is abnormal, it is determined whether the set value of the engine speed and the turbine speed is maintained for 5 seconds, and when it is normal, the relationship between the opening of the throttle valve and the speed of the vehicle is normal. After detecting (step 9), it is determined whether the lock-up area is received based on the detection signal of the opening of the throttle valve and the vehicle speed relationship (step 10), and if it is not the lock-up area, it returns to the routine (Routine), In the lockup area, the lockup clutch is activated / deactivated (step 11).

As described above, the present invention enables the control using a substitute input using the vehicle speed signal line, thereby enabling lock-up clutch control in the event of a failure of the engine speed line, thereby improving fuel economy, and using an alternative signal. This will increase the stability of the entire system.

Claims (3)

Engine speed (NE), turbine's input shaft speed (NT), vehicle speed (Vo), opening of throttle valve and P, R, N, D, 2, L of Inhibitor switch Detecting the position by the electronic control unit, checking the forward position of the actuator switches D, 2, L to check the abnormality of the engine speed line, and whether the input shaft rotation speed of the current turbine is higher than the set value. Checking step, and checking whether the current engine speed is above the set value, and if normal, enable / disable the lockup clutch by the relationship of engine speed, turbine speed and throttle valve opening, and the current engine speed is abnormal. When the result of the determination of the set value of the engine speed and the turbine speed is judged to maintain the set value for 5 seconds, and if it is normal, the lock-up clutch is activated / deactivated by the relationship between the opening of the throttle valve and the speed of the vehicle. Characterized in Lock-up clutch control method for a vehicle with an automatic transmission. The method of claim 1, further comprising: checking whether the current engine speed is greater than or equal to the set value and detecting the engine speed, turbine speed, and throttle valve opening relationship when the engine speed is normal, and detecting the engine speed, turbine speed, and throttle valve opening relationship. A lock up clutch control method for a vehicle with an automatic transmission, characterized in that it comprises the step of determining whether the lock-up area in response to the detection signal, and to activate / release the lock-up clutch in the lock-up area. According to claim 1, wherein when the current engine speed is abnormal, it is determined whether to maintain the set value for 5 seconds as a result of the determination of the set value of the engine speed and the turbine speed, the normal relationship between the opening degree of the throttle valve and the speed of the vehicle Determining whether the lockup area is in response to the detection signal of the opening degree of the throttle valve and the vehicle speed; and enabling / disengaging the lockup clutch in the lockup area. Lock-up clutch control method for vehicle with transmission.