KR100398212B1 - Shift controlling methode for automatic transmission of vehicle - Google Patents

Abstract

After shifting the shift lever neutral 'N' range → forward 'D' range according to the driver's intention to stop the vehicle, the output torque of the engine is reduced by dividing the engine's output torque in multiple stages when the driver's sudden acceleration will be accelerated. For the purpose;

Comparing the shift lever position neutral 'N' range with the forward 'D' range according to the driver's willingness to drive the vehicle in the stopped vehicle; If it is determined in the above step that the forward 'D' range is switched from the shift lever position neutral 'N' range, comparing and determining whether the tip-in condition by the accelerator pedal operation of the driver is satisfied; Comparing and determining whether the total control execution condition is satisfied when the tip-in condition by the accelerator pedal operation of the driver is satisfied in the above step; Outputting an engine torque reduction request signal when the total control execution condition is satisfied in the step, and comparing and determining whether the total control execution cancellation condition is satisfied; When the total control execution canceling condition is satisfied in the above step, the engine torque reduction canceling request signal is output and returned to the main routine, so that the shift feeling, clutch durability and acceleration feeling of the transmission can be improved when the vehicle starts. have.

Description

SHIFT CONTROLLING METHODE FOR AUTOMATIC TRANSMISSION OF VEHICLE}

The present invention relates to a shift control method of an automatic transmission for a vehicle. More particularly, the shift lever is shifted from a neutral 'N' range to a forward 'D' range according to a driver's willingness to drive an accelerator pedal for rapid acceleration. The present invention relates to a shift control method of an automatic transmission for a vehicle for reducing engine output torque in multiple stages during tip-in.

In general, an automatic transmission for a vehicle is provided with a shift control device that automatically adjusts a transmission ratio according to a traveling speed and a load of the vehicle.

The shift control device performs a shift by controlling a plurality of clutches and brakes installed in the gear train in an activated or inoperative state to adjust the output rotation speed of the planetary gear device.

After shifting the shift lever neutral 'N' range → forward 'D' range according to the driver's willingness in a vehicle equipped with the above-mentioned automatic transmission for vehicles, the engine output is conventionally applied when tip-in of the accelerator pedal is in accordance with the rapid acceleration will. Since there is no method for reducing, there is a problem that a shift shock occurs at the time of rapid acceleration after the start of driving, and at the same time, the clutch durability of the transmission deteriorates.

Accordingly, an object of the present invention is to solve the above problems, and after switching the shift lever neutral 'N' range → forward 'D' range according to the driver's willingness to drive, the accelerator pedal tip- It is to provide a shift control method of an automatic transmission for a vehicle that can reduce the output torque of the engine in multiple stages.

The present invention for achieving the above object,

Comparing and determining whether the shift lever is switched according to the driver's willingness to stop the vehicle;

Comparing the shift lever with the forward 'D' range in the neutral 'N' range, comparing and determining whether the driver satisfies the rapid acceleration driving condition;

If the driver's sudden acceleration driving condition is determined in the step, comparing and determining whether the total control execution condition is satisfied;

Outputting an engine torque reduction request signal when the total control execution condition is satisfied in the step, and comparing and determining whether the total control execution cancellation condition is satisfied;

When the total control execution canceling condition is satisfied in the above step, the engine torque reduction canceling request signal is output and returned to the main routine.

1 is a block diagram of a shift control apparatus of an automatic transmission for a vehicle according to the present invention;

2 is a flowchart illustrating a shift control method of an automatic transmission for a vehicle applied to the present invention.

3 is a sum control output signal graph according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: vehicle operation state detection means 110: throttle valve opening amount detection unit

120: output shaft speed detection unit 130: engine speed detection unit

140: shift lever position detection unit 150: accelerator pedal operation detection unit

200: shift control means 300: engine control means

400: first driving means 500: second driving means

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

1 is a block diagram illustrating a shift control apparatus of an automatic transmission for a vehicle according to the present invention, and the vehicle operation state detecting apparatus 100 detects a vehicle operating state that is variably output according to the operating state of the vehicle. Outputs a predetermined control signal to the vehicle operation state detection device 100 to receive a signal detected by the vehicle operation state detection device 100, and is synchronized with the control signal and outputs a shift mode state; After the throttle valve opening, the output shaft speed, the engine speed, the shift lever position and the accelerator pedal operating status are input, the shift lever is shifted from the neutral 'N' range to the forward 'D' range according to the driver's willingness to drive. When the accelerator pedal tip-in operation according to the sudden acceleration will be input, the engine torque reduction request signal is output in accordance with the total control condition, and the total control is executed during the total control execution. When satisfied, the engine torque reduction cancel request signal is output. The engine control apparatus 300 is configured to reduce and increase the output of the engine according to the engine torque reduction and reduction cancel request signals output from the shift control apparatus 200. And outputs an engine control signal. The first driving device 400 is controlled by a shift control duty output from the shift control device 200 to shift a shift stage to a target shift stage. According to the engine control signal output from the engine control device 300 to reduce and increase the output of the engine to drive the vehicle.

The apparatus 100 for detecting a vehicle operation state includes: a throttle valve opening amount detection unit 110 which is applied when a shift stage is determined by detecting an opening amount of a throttle valve that interlocks according to an accelerator pedal operation state of a driver; An output shaft rotation speed detection unit (120) which is applied to determine a gear stage by detecting the rotation speed of the output shaft of the automatic transmission as a signal corresponding to the vehicle speed of the vehicle in operation; An engine speed detection unit (130) applied to determine a speed of the engine by detecting the speed of the engine of the vehicle in operation; A shift lever position detector 140 for detecting that the shift lever is positioned at the neutral 'N' and the forward 'D' positions according to a driver's shift lever operation; The accelerator pedal operation state detection unit 150 for detecting the accelerator pedal opening degree according to the driver's accelerator pedal operation state is made.

With reference to Figures 2 and 3 attached to the shift control operation of the automatic transmission for a vehicle having the above configuration will be described in detail.

The vehicle operation state detecting apparatus 100 detects a throttle valve opening, an output shaft rotational speed, an engine rotational speed, a shift lever position, and an accelerator pedal operating state.

Accordingly, the shift control apparatus 200 outputs a predetermined control signal to the vehicle operation state detecting apparatus 100, and the vehicle operating state detecting apparatus 100 outputs a predetermined control signal output from the shift control apparatus 200. Outputs the throttle valve opening degree, the output shaft rotation speed, the engine rotation speed, the shift lever position, the accelerator pedal operation state, and the like, which are detected in synchronization with each other.

The shift control apparatus 200 receives the throttle valve opening degree, the output shaft rotation speed, the engine rotation speed, the oil temperature and the shift lever position, etc. input from the vehicle operation state detection device 100, and the driver's willingness to drive the vehicle in the vehicle that is stopped. By comparing the shift lever from the neutral 'N' range to the forward 'D' range is determined (S100, S110).

When it is determined that the shift lever is switched from the neutral 'N' range to the forward 'D' range, the shift control apparatus 200 determines whether to operate an accelerator pedal tip-in according to the driver's willingness to accelerate. Compare and determine (S120).

When it is determined that the accelerator pedal tip-in operation is made according to the driver's willingness to accelerate, the shift control apparatus 200 compares and determines whether the total control execution condition for controlling the output torque of the engine is satisfied (S130). .

The execution condition of the total control is shift lever position neutral 'N' → forward 'D', CAN communication error not detected, seal throttle valve opening (Th)> idle throttle opening (Idle Th), actual engine rotation It is a condition that must satisfy both the conditions Ne> idle engine speed Idle Ne and engine torque reduction time <first set time (1.0 sec).

When it is determined that the total control execution condition is satisfied in the above, the shift control apparatus 200 changes the shift lever neutral 'N' → forward 'D' of the driver by the accelerator pedal tip-in according to the sudden acceleration driving intention. The engine output torque reduction request signal for reducing the generated shift shock is output to the engine control apparatus 300 as shown in FIG. 3 (S140).

Accordingly, the engine control apparatus 300 receives the engine output torque reduction request signal output from the shift control apparatus 200 and transmits a predetermined engine control signal to the second driving means in order to reduce and control the output of the engine in operation. 500).

The second driving unit 500 reduces the output of the engine according to the engine control signal output from the engine control device 300 and outputs the power, and then transfers the output power to the automatic transmission.

Subsequently, the shift control apparatus 200 compares and determines whether the total control execution cancellation condition is satisfied while the engine output torque is reduced by the engine output torque reduction request signal outputted above (S150).

The total control execution releasing conditions are shift lever position neutral 'N' → forward 'D', CAN communication error not detected, seal throttle valve opening (Th) <idle throttle opening (Idle Th), seal engine Even if only one of the conditions of rotation speed Ne <idle engine rotation speed Idle Ne and engine torque reduction time> 1st set time (1.0 sec) is satisfied, it is a condition which is canceled | released.

During the total control execution to reduce the output torque of the engine, when the total control execution canceling condition is satisfied, the shift control apparatus 200 is in progress without shifting the vehicle to the target shift stage according to the driver's sudden acceleration intention. In response to the determination, the engine output torque reduction cancel request signal for normally restoring the output torque of the engine is output to the engine control device 300 and returned to the main routine (S160).

The engine control device 300 outputs a predetermined engine control signal to the second driving device 500 for restoring the engine output to a normal state according to the engine output torque reduction release request signal input from the shift control device 200. do.

The second drive device 500 restores the output torque of the engine reduced and outputted in synchronization with a predetermined engine control signal output from the engine control device 300 to a normal state, and then a torque converter (not shown) of the automatic transmission. To pass.

Thus, after switching from the vehicle to a shift lever neutral 'N' range → forward 'D' range according to the driver's willingness to start, the accelerator pedal for rapid acceleration is operated (Tip-in). When the engine output torque is reduced in multiple stages, it is possible to improve the shifting feeling, the clutch durability and the acceleration feeling at the time of shifting.

As described above, the shift control method of the automatic transmission for a vehicle according to the embodiment of the present invention is to accelerate the driver after switching the shift lever neutral 'N' → forward 'D' range according to the driver's willingness to drive in a stopped vehicle. By reducing the output torque of the engine when the accelerator pedal tip-in according to the will be divided into multiple stages, there is an effect of improving the transmission feeling, clutch durability, and the feeling of acceleration when the vehicle starts.

Claims (5)

Comparing and determining whether the shift lever is switched according to the driver's willingness to stop the vehicle; Comparing the shift lever with the forward 'D' range in the neutral 'N' range, comparing and determining whether the driver satisfies the rapid acceleration driving condition; If the driver's sudden acceleration driving condition is determined in the step, comparing and determining whether the total control execution condition is satisfied; Outputting an engine torque reduction request signal when the total control execution condition is satisfied in the step, and comparing and determining whether the total control execution cancellation condition is satisfied; And outputting an engine torque reduction release request signal and returning to a main routine when the total control execution canceling condition is satisfied in the above step. 2. The total control execution condition is a shift lever position neutral 'N' → forward 'D', seal throttle valve opening (Th)> idle throttle opening (Thdle), seal engine speed (Ne)> idle A shift control method for an automatic transmission for a vehicle, characterized in that both of the engine speed (Idle Ne) and the engine torque reduction time < the first set time (1.0 sec) are satisfied. The shift control method according to claim 2, wherein the total control execution condition includes that an error has not been detected during CAN communication. The total control execution releasing condition is a shift lever position neutral 'N' → forward 'D', a seal throttle valve opening degree Th <idle throttle opening degree Idle Th, a seal engine rotation speed Ne < A shift control method for an automatic transmission for a vehicle, characterized in that the condition is released even if only one of the idle engine speed (Idle Ne) and the engine torque reduction time> the first set time is satisfied. The shift control method according to claim 4, wherein the total control execution canceling condition includes that an error has not yet been detected during CAN communication.