KR101978350B1 - Target slip amount determination apparatus and method of lockup clutch - Google Patents

Abstract

An apparatus and a method for determining a lock-up clutch slip amount are disclosed. A method for determining a lock-up clutch slip amount according to the present invention includes: a reference vehicle speed detection unit detecting a reference vehicle speed based on a reference pedal amount; Detecting the running resistance using the reference vehicle speed and the current vehicle speed at the current gear stage; The target turbine torque detecting section detecting the target turbine torque using the traveling resistance; And a target slip amount detecting unit detecting the target slip amount using the target turbine torque.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lock-

The present invention relates to an apparatus and method for determining a lock-up clutch slip amount, and more particularly, to a lock-up clutch slip amount determining apparatus and method for determining a slip amount of a lock-up clutch in accordance with a running resistance of a vehicle.

BACKGROUND ART [0002] Generally, a torque converter used in an automatic transmission includes an impeller, a turbine, and a stator, which transmit power using a fluid flow. The torque converter transfers the power through the fluid and thus has a disadvantage that the energy loss is relatively large and the fuel economy of the vehicle equipped with the automatic transmission is lowered. To solve this problem, a lock-up clutch is applied to the torque converter.

The lock-up clutch connects the driving force of the engine directly to the transmission according to the driving conditions of the vehicle.

The conventional lock-up clutch is capable of controlling the torque converter operating pressure by switching the lockup clutch apply pressure to the line pressure and switching the direction of the hydraulic pressure supply passage.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-1542953 (2015.08.03) entitled " Apparatus and method for controlling slip lock-up of an automatic transmission ".

However, in the conventional lockup clutch, the turbine torque is detected based on the speed of the vehicle and the sensor value sensed by the accelerator pedal sensor, and the amount of slip is controlled according to the detected turbine torque. However, The variable resistance and the fuel consumption are degraded because the resistance elements are not reflected.

An object of the present invention is to provide a lock-up clutch slip amount determining device for determining a slip amount of a lock-up clutch in accordance with a running resistance of a vehicle and improving a shift efficiency and a fuel economy, And a method thereof.

A method of determining a lock-up clutch slip amount according to an aspect of the present invention includes: detecting a reference pedal amount based on a current vehicle speed and a gear stage; Detecting a running resistance using the reference pedal amount; The target turbine torque detecting section detecting the target turbine torque using the running resistance; And a target slip amount detecting unit detecting the target slip amount using the target turbine torque.

In the present invention, the step of detecting the running resistance may calculate the running resistance using an actual pedal amount corresponding to the current vehicle speed and a reference pedal amount.

In the present invention, the running resistance is characterized in that the actual pedal amount is subtracted from the reference pedal amount.

In the present invention, the step of detecting the target turbine torque is characterized by calculating the target turbine torque by applying the running resistance, the current gear stage and the current vehicle speed to a predetermined target turbine torque characteristic map.

In the present invention, the step of detecting the target slip amount may include calculating a target torque ratio using the target turbine torque and the engine torque; Calculating a target rotation ratio ratio using the target torque ratio; And calculating the target slip amount using the target rotation number ratio.

In the present invention, the target slip amount is obtained by subtracting a value obtained by multiplying the target revolution number by the engine revolution number in the engine revolution number.

A method of determining a lock-up clutch slip amount according to an aspect of the present invention includes: detecting a reference pedal amount based on a current vehicle speed and a gear position; A running resistance detector for detecting a running resistance using the reference pedal amount; A target turbine torque detecting section that detects a target turbine torque using the running resistance; And a target slip amount detecting section for detecting a target slip amount using the target turbine torque.

In the present invention, the running resistance detecting section calculates the running resistance using the actual pedal amount corresponding to the current vehicle speed and the reference pedal amount.

In the present invention, the running resistance is characterized in that the actual pedal amount is subtracted from the reference pedal amount.

In the present invention, the target turbine torque detecting section detects the target turbine torque by applying the running resistance, the current gear stage, and the current vehicle speed to a predetermined target turbine torque characteristic map.

In the present invention, the target slip amount detecting section calculates a target torque ratio using the target turbine torque and engine torque, calculates a target rotation ratio ratio with the target torque ratio, And the target slip amount is calculated by subtracting the value obtained by multiplying the target slip amount by the number of times.

The apparatus and method for determining the lock-up clutch slip amount according to one aspect of the present invention can improve the shift efficiency and fuel economy by determining the slip amount of the lock-up clutch according to the actual running state of the vehicle.

1 is a block diagram of an apparatus for determining a lock-up clutch slip amount according to an embodiment of the present invention.
2 is a diagram illustrating a reference torque detection method of the lock-up clutch slip amount determining apparatus according to an embodiment of the present invention.
3 is a diagram conceptually showing a method of calculating a running resistance of a lock-up clutch slip amount determining device according to an embodiment of the present invention.
4 is a view conceptually showing a method of calculating a target turbine torque of a lock-up clutch slip amount determining apparatus according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a method of calculating a target slip amount according to an embodiment of the present invention.
6 is a flowchart of a lock-up clutch slip amount determining method according to an embodiment of the present invention.

Hereinafter, an apparatus and method for determining a lock-up clutch slip amount according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. Further, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the user, the intention or custom of the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a block diagram of an apparatus for determining a lock-up clutch slip amount according to an embodiment of the present invention, FIG. 2 is a diagram illustrating a reference torque detection method of a lock-up clutch slip amount determining apparatus according to an embodiment of the present invention, FIG. 3 is a conceptual view illustrating a method of calculating a running resistance of a lock-up clutch slip amount determining apparatus according to an embodiment of the present invention. FIG. FIG. 5 is a conceptual diagram illustrating a method of calculating a target slip amount according to an embodiment of the present invention. Referring to FIG.

1, an apparatus for determining the lock-up clutch slip amount according to an embodiment of the present invention includes a vehicle speed sensor 50, an accelerator pedal sensor 60, an engine ECU (Electronic Control Unit) 70, a gear stage sensor 80 A reference pedal amount detecting unit 10, a running resistance detecting unit 20, a target turbine torque detecting unit 30, and a target slip amount detecting unit 40. [

The vehicle speed sensor 50 senses the vehicle speed of the vehicle.

The accelerator pedal sensor 60 senses the amount of the pedal that the driver depresses the accelerator pedal. That is, the accelerator pedal sensor 60 senses the position of the accelerator pedal when the driver depresses the accelerator pedal. As the accelerator pedal sensor 60, an Acceleration Position Sensor (APS) may be employed.

The engine ECU 70 controls the engine of the vehicle and provides the engine torque and the engine speed to the target slip amount detecting unit 40 via the can communication or the like.

The gear position sensor 80 senses the current gear position of the vehicle.

The reference pedal amount detection unit 10 uses the current vehicle speed and gear position to set the reference pedal amount APS _{Normal, Ref} .

Typically, the rotational speed of the impeller (engine) and turbine is the same when the lockup clutch is in the full engage state. That is, the torque converter (not shown) transmits the input torque at a ratio of 1: 1 from the engine to the transmission. A reference pedal amount for constant-speed cruising matching with 1: 1 is set in each car in each gear stage.

Referring to FIG. 2, when the driver runs, the reference pedal amount is determined by the current gear position and the current vehicle speed, and the reference turbine torque TRQ _{Normal, Ref} corresponding to the reference pedal amount is set do.

For example, when the current gear position is the first stage and the current vehicle speed is constant at 20 km / h, the reference pedal amount of the accelerator pedal is 7%, and the reference turbine torque corresponding to the reference pedal amount may be set to 11.8 Nm.

The running resistance detector 20 detects the driving resistance (APS _{Normal, actual} -APS _{Normal, Ref} ) by subtracting the reference pedal amount from the actual pedal amount corresponding to the current vehicle speed.

Normally, according to the shift pattern map, when the driver depresses the accelerator pedal, the vehicle must travel at a reference vehicle speed corresponding to the reference pedal amount of the corresponding accelerator pedal. However, it may not be possible to maintain the reference speed corresponding to the reference pedal amount by factors interfering with the running, for example, friction between the wheel and the ground, wind and rolling, and the like.

If there is an element that disturbs the running when the vehicle is traveling at a constant speed, the actual amount of the pedal becomes relatively large as compared with the amount of the reference pedal set in the shift pattern map when there is no obstructing element. That is, in order to travel at the same speed, the actual pedal amount becomes larger than the reference pedal amount due to the running resistance, so that the running resistance appears as an error between the actual pedal amount and the reference pedal amount.

The driving resistance detecting unit 20 receives the reference pedal amount detected by the reference pedal amount detecting unit 10 and receives the current gear position and the current vehicle speed from the gear position sensor 80 and the vehicle speed sensor 50, The actual pedal amount APS _{Normal, actual} corresponding to the current vehicle speed at the gear position is input from the accelerator pedal sensor 60. [

3, the running resistance detector 20 detects the driving resistance (APS _{Normal, actual} -APS _{Normal, Ref} ) by subtracting the reference pedal amount from the actual pedal amount corresponding to the current vehicle speed .

The target turbine torque detecting section 30 detects the target turbine torque TRQ _Target using the running resistance detected by the running resistance detecting section 20.

The target turbine torque is the turbine speed required to maintain the vehicle's target speed at the current running resistance. Therefore, the target turbine torque can be set in accordance with the running resistance described above.

Thus, the target turbine torque characteristic map is set in advance, and the target turbine torque detecting section 30 applies the running resistance, the current gear stage and the current vehicle speed to the target turbine torque characteristic map as shown in Fig. 4, . In this case, the target turbine torque characteristic map may be set for each gear stage.

The target slip amount detecting section 40 detects the target slip amount N _{slip_rpm} using the target turbine torque detected by the target turbine torque detecting section 30. [ For reference, the slip amount is a difference value between the engine speed and the turbine speed, and is used for duty control of the lockup clutch.

5, first, the target slip amount detecting unit 40 detects a target slip amount based on the engine torque TRQ _engine input from the engine ECU 70 and the target turbine torque detected by the target turbine torque detecting unit 30, (Torque ratio).

Since the torque ratio can be calculated as turbine torque / engine torque, the target slip amount detecting section 40 calculates the target torque ratio with the target turbine torque TRQ _target / engine torque TRQ _engine (Torque ratio = TRQ _Target / TRQ _engine ).

Then, the target slip amount detecting section 40 detects the target rotational speed Spd_rto _target using the target torque ratio.

A damper characteristic map that defines a rotation ratio ratio with respect to a torque ratio is usually set in a damper of the look-up clutch. Thus, the target slip amount detecting section 40 can calculate the target rotation number ratio by applying the target torque ratio to the damper characteristic map.

On the other hand, the rotation ratio can be calculated by the turbine speed / engine speed, and the target speed ratio is defined as target turbine speed / engine speed (Spd_rto _target = target turbine speed / engine speed. And the equation for calculating the target rotation number ratio is applied to the equation for calculating the target slip amount and can be used for calculating the target slip amount.

Here, the target turbine speed is a turbine speed required to travel at a reference speed corresponding to the reference pedal amount in the normal running state in which the running resistance exists. The engine rotational speed is input from the engine ECU 70.

Then, the target slip amount detecting section 40 detects the target slip amount using the target rotation number ratio. Since the slip amount is a value obtained by subtracting the turbine speed from the engine speed as described above, the target slip amount detecting unit 40 subtracts the target turbine speed from the engine speed, Can be calculated. Here, the target turbine speed is a value obtained by multiplying the target rotation speed ratio by the engine speed (target turbine speed = Spd_rto _target × engine speed).

For reference, in the full engagement state, the engine speed and the turbine speed are the same because the engine and the turbine rotate at the same speed. Therefore, instead of the turbine speed, the target turbine speed can be calculated by multiplying the engine speed by the target speed ratio.

As the target turbine output the rotation speed, the target slip amount detecting section 40 calculates the target slip amount by subtracting a target rotation speed turbine in the engine rotation speed (N _{slip _rpm} = engine speed-target turbine speed or N _{slip _rpm} = engine speed-Spd_rto _target x engine speed).

Hereinafter, a method of determining the lock-up clutch slip amount according to an embodiment of the present invention will be described in detail with reference to FIG.

6 is a flowchart of a lock-up clutch slip amount determining method according to an embodiment of the present invention.

Referring to FIG. 6, the reference pedal amount detection unit 10 detects the reference pedal amount APS _{Normal, Ref} using the current vehicle speed and the gear position (S10).

Next, the running resistance detection unit 20 receives the current gear position and the current vehicle speed from the gear range sensor 80 and the vehicle speed sensor 50, subtracts the reference pedal amount from the actual pedal amount corresponding to the current vehicle speed, (Driving resistance = APS _{Normal, actual} -APS _{Normal, Ref} ) (S20).

As the running resistance is detected, the target turbine torque detecting section 30 calculates the target turbine torque by applying the running resistance, the current gear stage, and the current vehicle speed to the target turbine torque characteristic map (S30).

Next, the target slip amount detecting section 40 calculates a target torque ratio using the engine torque TRQ _engine input from the engine ECU 70 and the target turbine torque (S40). In this case, the target slip amount detecting unit 40 may calculate the target torque ratio (Torque = TRQ _Target / TRQ _engine ) with the target turbine torque TRQ _Target / engine torque TRQ _engine .

Next, the target slip amount detecting section 40 calculates the target rotation number ratio by applying the target torque ratio to the damper characteristic map (S50). Meanwhile, the target rotation ratio ratio may be defined as target turbine speed / engine speed (Spd_rto _target = target turbine speed / engine speed). And the equation for calculating the target rotation number ratio is applied to the equation for calculating the target slip amount and can be used for calculating the target slip amount.

Then, the target slip amount detecting section 40 calculates the target slip amount by subtracting the target turbine speed from the engine speed. In this case, the target slip amount detecting section 40 calculates the target slip amount by subtracting the target turbine speed (Spd_rto _target × engine speed) obtained by multiplying the target turbine speed, that is, the target rotation speed ratio, The (N = engine _{speed-slip _rpm} target turbine speed or engine speed N = _{_rpm slip-Spd_rto} × _target engine speed) (S60).

As described above, the apparatus and method for determining the lock-up clutch slip amount according to an embodiment of the present invention can improve the shift efficiency and fuel economy by compensating the slip amount of the lock-up clutch according to the running resistance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

10: Reference pedal amount detecting section
20:
30: target turbine torque detector
40: Target slip amount detecting section
50: vehicle speed sensor
60: Accelerator pedal sensor
70: engine ECU
80: gear range sensor

Claims (11)

Detecting a reference pedal amount based on a current vehicle speed and a gear stage;
Detecting a running resistance using the reference pedal amount;
The target turbine torque detecting section detecting the target turbine torque using the running resistance; And
And the target slip amount detecting unit detects the target slip amount using the target turbine torque,
The step of detecting the running resistance may include calculating the running resistance using an actual pedal amount corresponding to the current vehicle speed and a reference pedal amount,
Wherein the running resistance is obtained by subtracting the reference pedal amount from the actual pedal amount,
Wherein the reference pedal amount is set by a vehicle speed and a gear stage.
delete delete 2. The method according to claim 1, wherein the step of detecting the target turbine torque comprises calculating the target turbine torque by applying the running resistance, the current gear stage and the current vehicle speed to a predetermined target turbine torque characteristic map Clutch slip amount determining method.
The method according to claim 1, wherein the step of detecting the target slip amount
Calculating a target torque ratio using the target turbine torque and the engine torque;
Calculating a target rotation ratio ratio using the target torque ratio; And
And calculating the target slip amount using the target rotation number ratio.
6. The lock-up clutch slip amount determining method according to claim 5, wherein the target slip amount is obtained by subtracting a value obtained by multiplying the engine rotation speed by the target rotation speed ratio and the engine rotation speed.
A reference pedal amount detecting unit for detecting a reference pedal amount based on a current vehicle speed and a gear position;
A running resistance detector for detecting a running resistance using the reference pedal amount;
A target turbine torque detecting section that detects a target turbine torque using the running resistance; And
And a target slip amount detecting section for detecting a target slip amount using the target turbine torque,
The running resistance detector calculates the running resistance using the actual pedal amount corresponding to the current vehicle speed and the reference pedal amount,
Wherein the running resistance is obtained by subtracting the reference pedal amount from the actual pedal amount,
Wherein the reference pedal amount is set by a vehicle speed and a gear stage.
delete delete 8. The lockup clutch according to claim 7, wherein the target turbine torque detecting section detects the target turbine torque by applying the running resistance, the current gear stage and the current vehicle speed to a predetermined target turbine torque characteristic map. Crystal device.
The target slip amount detecting unit according to claim 7, wherein the target slip amount detecting unit calculates a target torque ratio using the target turbine torque and engine torque, calculates a target rotation ratio ratio with the target torque ratio, Up clutch slip amount determining means calculates the target slip amount by subtracting a value obtained by multiplying the engine speed by the engine speed.

Images