KR20120001430A - System for shift controlling of automatic transmission vehicle and method thereof - Google Patents

Abstract

PURPOSE: The shift control device and method of an auto transmission is provided to improve continued ratio by executing neutrality control in the stationary and deceleration state. CONSTITUTION: An information detection part detects the operating information of a vehicle. An acceleration pedal detection part(12) provides the displacement information of an accelerating pedal to a controller(15). A car speed detection part(13) provides driving car speed information to the controller. The controller analyzes the operating information and compares the demand fuel quantity of a driving shift end and the demand fuel quantity of a neutrality shift end. An actuator(16) runs a bonding element and a release element according to the control of the controller.

Description

Transmission control system and method of automatic transmission {SYSTEM FOR SHIFT CONTROLLING OF AUTOMATIC TRANSMISSION VEHICLE AND METHOD THEREOF}

The present invention relates to an automatic transmission, and more particularly, to a transmission control apparatus and a method of an automatic transmission that provides fuel efficiency improvement and NVH (Noise Vibration Harshness) performance by performing neutral control in a deceleration and stop state.

In the automatic transmission applied to the vehicle, the shift control means (TCU) operates a plurality of actuators to control the hydraulic pressure in accordance with the traveling speed, the opening amount of the throttle valve, and the vehicle, thereby automatically shifting to the target shift stage.

The automatic transmission has friction elements that are released from the operating state and friction elements that are converted from the released state to the operating state according to the execution of the transmission, and the operation of these friction elements is carried out by hydraulic pressure. As the performance of is determined, research is being actively conducted to improve the shift performance.

Since the automatic transmission reduces the speed by the stop inertia force when the accelerator pedal is turned off in the driving state, the automatic transmission performs downshift before stopping according to the shift pattern set in terms of the opening ratio of the throttle valve and the vehicle speed.

In this way, fuel is continuously consumed even in the non-driven region in which the driver is not accelerated, and energy loss due to slip between the turbine and the impeller inside the torque converter is generated, which leads to deterioration of fuel efficiency.

Therefore, in the conventional vehicle, fuel blocking control is performed by directly connecting the damper clutch in order to improve fuel efficiency under the above conditions. However, since the area for directly connecting the damper clutch is reduced during deceleration, it is not possible to fundamentally eliminate fuel deterioration. have.

The present invention has been proposed in order to solve the above problems, and an object of the present invention is to improve fuel economy and smart running when the required fuel amount of the traveling shift stage exceeds the required fuel amount of the neutral transmission stage in a decelerated state. To provide gearshift behavior.

In addition, the neutral control is to be executed when entering the stop state by the operation of the brake pedal.

According to an embodiment of the present invention to achieve the above object, an information detection unit for detecting the driving information of the vehicle; In case of deceleration driving where the operation of the accelerator pedal is not detected by analyzing the driving information provided from the information detecting unit, the required fuel amount of the traveling shift stage is compared with the required fuel amount of the traveling shift stage and the required fuel amount of the neutral shift stage. A control unit for controlling switching to the neutral shift stage when the required fuel amount is exceeded; Provided is a shift control apparatus of an automatic transmission including an actuator for operating a coupling element and a release element under control of the controller.

A shift stage detector for providing the shift stage information selected by the shift lever to the controller; An accelerator pedal detector for providing displacement information of the accelerator pedal to the controller; A vehicle speed detector configured to provide driving vehicle speed information to the controller; Provided is a shift control apparatus of an automatic transmission including a brake detector configured to provide displacement information of a brake pedal to a controller.

In addition, the control unit is applied to the line pressure control map in the switching of the neutral shift stage so that stepped shift does not occur, and shift control of the automatic transmission, characterized in that for limiting the switching control of the neutral shift stage in the downhill driving of the slope. Provide a device.

In addition, the control unit provides a shift control apparatus of an automatic transmission, characterized in that the switching control from the traveling shift stage to the neutral shift stage when the brake pedal is stopped.

In addition, according to another embodiment of the present invention, the process of determining whether the driving information is a driving shift stage, deceleration driving; Calculating the required fuel amount of the traveling shift stage and the required fuel amount of the neutral shift stage in the traveling shift stage and the deceleration driving; A shift control method of an automatic transmission including a process of releasing a clutch associated with an input shaft of a transmission and executing neutral control when the required fuel amount of the traveling transmission stage exceeds the required fuel amount of the neutral transmission stage.

In addition, the present invention provides a shift control method for an automatic transmission further comprising the step of performing a neutral control by releasing the clutch associated with the input shaft of the transmission when the driving shift stage is stopped by the operation of the brake pedal. to provide.

As described above, the automatic transmission vehicle according to the present invention executes the neutral control under the conditions set during the deceleration driving, thereby improving fuel economy and providing no-load driving, thereby improving the vehicle's NVH performance.

In addition, by executing the neutral control in the stop state by the brake pedal, the fuel consumption can be reduced to provide fuel economy, and unnecessary operation of the shift lever can be eliminated, thereby providing convenience in driving and stability against errors.

1 is a view schematically showing a shift control apparatus of an automatic transmission according to an embodiment of the present invention.
2 is a view schematically illustrating a shift control procedure of an automatic transmission according to an embodiment of the present invention.
3 is a view showing the operating elements for each shift stage of the automatic transmission according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily carry out the embodiments.

The present invention can be embodied in various different forms, and thus the present invention is not limited to the embodiments described herein.

1 is a view schematically showing a shift control apparatus of an automatic transmission according to an embodiment of the present invention.

Referring to FIG. 1, the present invention includes a shift stage detecting unit 11, an accelerator pedal detecting unit 12, a vehicle speed detecting unit 13, a brake detecting unit 14, a control unit 15, and an actuator 16.

The shift stage detecting unit 11 detects a shift stage selected by the shift lever and provides information about the shift stage to the controller 15.

The accelerator pedal detection unit 12 detects the displacement of the accelerator pedal operated by the driver and provides information about the accelerator pedal to the controller 15.

The vehicle speed detecting unit 13 detects the traveling vehicle speed from the rotational speed of the transmission output shaft and provides the control unit 15 with information about it.

The vehicle speed detection unit 13 may be applied as a wheel sensor mounted to each wheel.

The brake detector 14 detects the displacement of the brake pedal operated by the driver and provides information about the brake pedal to the controller 15.

The controller 15 analyzes the driving information of the vehicle to determine the required fuel amount Fd and the neutral shift stage at the traveling shift stage D stage when the driving speed stage D stage is a deceleration driving in which the displacement of the accelerator pedal is not detected. Calculate the required fuel amount Fn in the N stage), and if the required fuel amount Fd in the traveling shift stage D stage exceeds the required fuel amount Fn in the neutral shift stage N stage, the traveling shift stage D stage Switch to the neutral shifting stage (N-speed) from.

The control unit 15 applies a line pressure control map so as to prevent a shift heterogeneity from being switched at the neutral shift stage (N stage), so that stepped shifts are not generated, and the shift stage according to the vehicle speed is based on the driving pattern map. Calculate and control the clutch, which is the engaging element, and the brake, which is the friction element.

When the controller 15 detects the gradient and determines that the road is downhill, the inertia force is greater than the driving force, thereby limiting the switching of the neutral shift stage, and the downhill degree is set differently according to the characteristics of the vehicle.

When the vehicle is stopped by the operation of the brake pedal, the controller 15 switches from the driving shift stage to the neutral shift stage.

The controller 15 returns to the traveling shift stage when the neutral shift stage is not satisfied while the neutral shift stage is controlled.

The condition of the neutral shift stage switching of the control unit 15 is set as follows.

The shift stage selected by the shift lever is a traveling shift stage, the displacement of the accelerator pedal is 0%, and there is no acceleration intention, and the transmission oil temperature satisfies all conditions included in the set reference temperature range.

Actuator 16 is a plurality of solenoid valve for operating the coupling element and the release element, which is operated in accordance with the control signal applied from the control unit 15 to switch from the driving gear shift stage to the neutral gear shift stage or the driving gear shift stage from the neutral gear shift stage. Switch to.

For example, when a four-speed automatic transmission is applied, the coupling elements of the front clutch, the rear clutch, and the end clutch are operated on / off.

The operation of the present invention including the above functions will be described with reference to FIG. 2 as follows.

When the vehicle equipped with the automatic transmission to which the present invention is applied is operated, the controller 15 detects and analyzes general driving state information and driving information according to the driving (S101).

For example, the shift stage selected by the shift lever, the displacement of the accelerator pedal, the vehicle speed, the brake displacement, the gradient, the oil temperature, the coolant temperature, and the like.

The control unit 15 determines whether the shift lever is selected as the travel shift stage D, and the displacement of the accelerator pedal is not detected (TPS = 0%), and is decelerating (S102).

In step S102, if the speed decreases at the traveling speed change stage D, the required fuel amount Fd at the traveling speed change stage D and the required fuel amount Fn at the neutral speed change stage N are calculated (S103).

Then, the vehicle speed detection unit 13 analyzes the information to determine whether the vehicle is running (S104).

If the vehicle speed is not detected in S104, it is determined whether the brake pedal is in a stopped state by operation of the brake pedal (S105).

If the brake pedal is not operated in S105, the process returns to S103.

If it is determined that the vehicle is decelerating in step S104, the required fuel amount Fd in the traveling shift stage D stage calculated in S103 is compared with the required fuel amount Fn in the neutral shift stage N stage, and the traveling shift stage D In step S106, it is determined whether the required fuel amount Fd is larger than the required fuel amount in the neutral shift stage N stage (S106).

If the required fuel amount Fd at the traveling shift stage D stage is smaller than the required fuel amount Fn at the neutral shift stage N stage in S106, the current driving condition is maintained (S107).

However, if the required fuel amount Fd at the traveling shift stage D stage is larger than the required fuel amount Fn at the neutral shift stage N stage in S106, the actuator 16 is controlled to be associated with the input shaft of the transmission. The clutch is released and air volume control or fuel amount control is executed in accordance with the characteristics of the vehicle model (S108).

That is, in the case of a vehicle to which a gasoline engine is applied, air volume control is executed, and fuel amount control, which is a vehicle to which a diesel engine is applied, is executed.

For example, in the case of a four-speed automatic transmission, as shown in FIG. 3, a coupling element for coupling a shift stage includes a front clutch, a rear clutch, and an end clutch, and a friction element includes a kickdown brake and a reverse brake. .

Accordingly, the controller 15 releases the front clutch, the rear clutch, and the end clutch, which are coupling elements, to control the actuator 16 to switch from the traveling shift stage D stage to the neutral shift stage N stage.

In the process of switching to the neutral shift stage, the number of stages according to the vehicle speed is determined, and accordingly the clutch is released (S109).

For example, as shown in FIG. 3, the end clutch, which is a coupling element, is released at the first and second speeds in the driving shift stage (D stage), and the front clutch, the rear clutch, and the end clutch, which are engaging elements, are engaged at the third speed. Release the end clutch, which is a coupling element, in case of 4 speeds.

In addition, when the vehicle is stopped by the operation of the brake pedal in the determination of S105, as described in the above-described process of S108, the controller 15 controls the actuator 16 to shift the neutral at the traveling shift stage D stage. Switch to stage (N stage).

Thus, fuel consumption is minimized, thereby providing fuel economy improvement.

However, although the deceleration travel is being performed, the control part 15 does not perform switching to a neutral shift stage (N stage) because inertia force is larger than engine driving force in the state which is traveling downhill of a slope.

The switching of the neutral speed change stage is set according to the characteristics of the vehicle according to the degree of the ramp.

In addition, when the accelerator pedal is operated in the state controlled by the neutral shift stage (N stage) as described above and is switched to the acceleration condition or the starting condition, the controller 15 controls the actuator 16 to drive the shift stage (D stage). Return to

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, , Additions, deletions, and so on, other embodiments may be easily suggested, but this is also included in the spirit of the present invention.

11 shift stage detection unit 12 accelerator pedal detection unit
13 vehicle speed detection unit 14 brake detection unit
15 controller 16 actuator

Claims (9)

An information detection unit detecting driving information of the vehicle;
In case of deceleration driving where the operation of the accelerator pedal is not detected by analyzing the driving information provided from the information detecting unit, the required fuel amount of the traveling shift stage is compared with the required fuel amount of the traveling shift stage and the required fuel amount of the neutral shift stage. A control unit for controlling switching to the neutral shift stage when the required fuel amount is exceeded;
Actuator for operating the coupling element and the release element under the control of the controller
Shift control apparatus of an automatic transmission comprising a. The method of claim 1,
A shift stage detector for providing the shift stage information selected by the shift lever to the controller;
An accelerator pedal detector for providing displacement information of the accelerator pedal to the controller;
A vehicle speed detector configured to provide driving vehicle speed information to the controller;
A brake detector for providing displacement information of the brake pedal to the controller;
Shift control apparatus of an automatic transmission comprising a. The method of claim 1,
The control unit is a shift control device of the automatic transmission, characterized in that by applying a line pressure control map in the switching of the neutral shift stage so that stepped shift does not occur. The method of claim 1,
The control unit of the automatic transmission, characterized in that for limiting the switching control of the neutral shift stage in the downhill driving of the ramp. The method of claim 1,
The control unit shift control device of the automatic transmission, characterized in that for controlling the switching from the traveling shift stage to the neutral shift stage when the stop state by the operation of the brake pedal. The method of claim 1,
The neutral shift stage switching condition of the control unit is set so that the shift stage is the traveling shift stage, the accelerator pedal displacement is 0%, and the transmission oil temperature satisfies all the conditions included in the set reference temperature range. Shift control device of automatic transmission. Determining whether the driving information is a driving shift stage selection and decelerating driving;
Calculating the required fuel amount of the traveling shift stage and the required fuel amount of the neutral shift stage in the traveling shift stage and the deceleration driving;
Performing a neutral control by releasing the clutch associated with the input shaft of the transmission when the required fuel amount of the traveling shift stage exceeds the required fuel amount of the neutral transmission stage;
Shift control method of an automatic transmission comprising a. The method of claim 7, wherein
And a neutral control by releasing the clutch associated with the input shaft of the transmission when the driving shift stage is stopped by the operation of the brake pedal. The method of claim 7, wherein
The shift control method of the automatic transmission, characterized in that for limiting the neutral control if the driving speed change stage, the deceleration driving or downhill driving.

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