KR20030018336A - Method for manual down shift control of automatic transmission in vehicle - Google Patents

Abstract

PURPOSE: A manual down shift control method of an automatic transmission is provided to control a speed shift according to a slop travel condition and a vehicle speed condition upon a manual down shift in a traveling vehicle on a downward slop. CONSTITUTION: A vehicle travel state detector(100) detects a vehicle travel state varied according to the travelling state of a vehicle. A speed shift control device(200) outputs a certain control signal to the vehicle travel state detector to receive a detected signal from the vehicle travel state detector. The speed shift control device outputs a certain control signal to down shift-control a shift gear according to a slop travel condition and a travel speed condition after a manual down shift control is performed in a traveling vehicle. Then a driving device(300) changes the shift gear down by being synchronized by a speed shift duty control signal outputted from the speed shift control device. Thus, a speed shifting shock is reduced and speed shifting performance is improved.

Description

Manual down-shift control method of automatic transmission for vehicles {METHOD FOR MANUAL SHIFT CONTROL OF AUTOMATIC TRANSMISSION IN VEHICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission for a vehicle, and more particularly, to a shift downshift control method by a manual lever operation of a driver on a downhill road while driving.

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.

In the automatic transmission vehicle that performs the shift as described above, the speed change pattern stored in the memory by a preset program, that is, as shown in FIG. 4, sequentially 1 speed according to the output shaft rotation speed and the throttle valve opening degree corresponding to the vehicle speed. Shifts up to 4 speeds or downshifts from 4 speeds to 1 speed at.

As described above, when driving downhill in an automatic transmission vehicle that performs shifting as described above, the shift stage is shifted to a low shift stage by operating a manual lever when driving a cost reduction using an engine brake.

However, the conventional method described above is set to perform the shift to the low shift stage according to the manual lever operation on a flat surface, so that a shift shock occurs when the shift stage shifts down by the driver's manual lever operation on the downhill. There is a problem of slow response.

Accordingly, an object of the present invention is to solve the above problems, and for a vehicle capable of performing shift control according to a gradient condition and a vehicle speed condition when the manual downshift for using the engine brake when driving downhill in a driving vehicle. It is to provide a manual downshift shift control method of an automatic transmission.

The present invention for achieving the above object,

Determining a shift condition in a driving vehicle;

Determining a driving road condition if the shift condition is a manual downshift condition in the step;

When the driving road condition is a driving condition in the steel plate in the step, it is characterized in that for outputting a predetermined shift control signal for controlling the shift stage in accordance with the driving condition and the driving vehicle speed condition in the steel plate.

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

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

<Description of Symbols for Main Parts of Drawings>

100: vehicle driving state detection means 110: throttle valve opening degree detection unit

120: turbine rotation speed detection unit 130: output shaft rotation speed detection unit

140: engine speed detection unit 150: accelerator pedal operation state detection unit

160: slope detection unit 170: steering wheel detection unit

200: shift control device 300: drive device

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

1 is a block diagram of a shift control apparatus of an automatic transmission for a vehicle according to the present invention. The vehicle driving state detecting apparatus 100 detects a vehicle driving state that is variably output according to the driving state of a vehicle, and the shift control apparatus 200 To output a predetermined control signal to the vehicle operation state detection device 100 to receive the signal detected by the vehicle driving state detection device 100, the throttle valve opening degree of the vehicle to be output in synchronization with the control signal, If the manual downshift control is performed according to the driver's shift lever operation, the turbine driving speed, output shaft speed, engine speed, accelerator pedal operation status, ramp and shift lever position are input. Outputs a predetermined control signal for downshifting the shift stage according to the traveling vehicle speed, and the driving device 300 exits from the shift control device 200. In synchronization with the shift control duty signal it is then shifted down the shift speed.

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; A turbine rotation speed detection unit (120) which is applied at the time of determining the shift stage by detecting the turbine rotation speed of the automatic transmission vehicle in operation; An output shaft rotation speed detection unit (130) which is applied to determine a speed change 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 being driven; An engine speed detection unit 140 which is applied when the speed of the engine is determined by determining the speed of the engine of the running vehicle; An accelerator pedal operation detector 150 for detecting that an on / off state of the switch is changed according to an accelerator pedal operation state of the driver; A slope detection unit 160 which is applied when the shift stage is determined by detecting an inclined driving state of the vehicle; The shift lever position detection unit 170 detects a shift lever position that varies according to a driver's shift lever (manual lever) operating state.

A manual down shift control method for an automatic transmission for a vehicle having the above configuration will be described in detail with reference to FIG. 2.

The vehicle driving state detecting apparatus 100 detects a throttle valve opening, a turbine rotational speed, an output shaft rotational speed, an engine rotational speed, an accelerator pedal operating state, a ramp, and a shift lever position that are varied according to the vehicle driving state. .

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

The shift control apparatus 200 receives a throttle valve opening, a turbine rotational speed, an output shaft rotational speed, an engine rotational speed, an accelerator pedal operation state, a ramp, and a shift lever position input from the vehicle driving state detection device 100. It is determined whether the program satisfies the manual downshift condition according to the shift lever (manual lever) operation of the driver by the program (S100 and S110).

When it is determined that the manual downshift condition according to the shift lever operation of the driver is satisfied, the shift control apparatus 200 determines a driving road condition of the driving vehicle (S120).

In operation S130, it is determined whether the driving road condition of the vehicle is the steel sheet road (SLOP) condition.

When it is determined in the above that the condition of the driving road is a steel sheet condition, the shift control apparatus 200 determines whether the driving condition of the steel sheet road (SLOP) is within a predetermined first setting range (S1 <SLOP <0). It is determined (S135).

In the above, when it is determined that the driving condition of the steel plate road (SLOP) is a road condition included in the first predetermined range (S1 <SLOP <0), the shift control apparatus 200 determines that the vehicle speed V of the traveling vehicle is predetermined. It is determined whether the vehicle speed is within the first setting range (0 <V <V1) (S140).

When it is determined that the vehicle speed is within the predetermined first setting range (0 <V <V1), the shift control apparatus 200 adds and computes the first correction duty Da1 to the current duty Da. The duty control signal corresponding to the calculated duty value Du is output (S145).

However, when the vehicle speed of the traveling vehicle is not within the predetermined first setting range (0 <V <V1), the shift control apparatus 200 determines that the vehicle speed of the traveling vehicle is within the predetermined second setting range (V1). <V <V2) is determined (S150).

When it is determined that the vehicle speed of the traveling vehicle is within the predetermined second setting range (V1 <V <V2), the shift control apparatus 200 adds the second correction duty Da2 to the current duty Da. The duty control signal corresponding to the calculated duty value Du is output (S155).

However, when the vehicle speed of the traveling vehicle is not included in the predetermined second setting range (V1 <V <V2), however, the shift control apparatus 200 is a third correction duty Da3 to the current duty Da. In operation S160, the duty control signal corresponding to the duty value Du calculated by adding is calculated.

In addition, in the case where the driving condition of the steel plate road SLOP is not included in the predetermined first setting range S1 <SLOP <0 in step S135, that is, the shift control apparatus 200 performs the SLOP. It is determined whether the condition of) satisfies the second set condition SLOP <S1 (S170).

In the above, when it is determined that the condition of the steel plate furnace SLOP satisfies the second setting condition SLOP <S1, the shift control apparatus 200 determines that the vehicle speed V of the traveling vehicle is within the predetermined first setting range (0 < It is determined whether the vehicle speed included in V < V1) (S175).

When it is determined that the vehicle speed is within the predetermined first setting range (0 <V <V1), the shift control apparatus 200 adds a fourth correction duty Da4 to the current duty Da, The duty control signal corresponding to the calculated duty value Du is output (S180).

However, when the vehicle speed of the traveling vehicle is not within the predetermined first setting range (0 <V <V1), the shift control apparatus 200 determines that the vehicle speed of the traveling vehicle is within the predetermined second setting range (V1). <V <V2) (S185).

When it is determined that the vehicle speed of the traveling vehicle is within the predetermined second setting range V1 <V <V2, the shift control apparatus 200 adds a fifth correction duty Da5 to the current duty Da. The duty control signal corresponding to the calculated duty value Du is output (S190).

However, when the vehicle speed of the traveling vehicle is not included in the predetermined second setting range (V1 <V <V2), the shift control apparatus 200 is the sixth correction duty Da6 to the current duty Da. A corresponding duty control signal is output as a duty value Du calculated by adding and calculating (S195).

However, when the condition of the steel plate furnace SLOP does not satisfy the second set condition SLOP <S1 in S170, the shift control apparatus 200 may set the predetermined condition in which the steel sheet furnace SLOP driving condition is predetermined. The method determines whether it is included in the range S1 <SLOP <0.

However, when the road condition of the traveling vehicle is not a steel plate condition in S120, the shift control apparatus 200 sets the duty control signal as a normal shift control duty Da value to the corresponding duty control signal Du. Output (S200).

As a result, the downshift control is performed differently according to the gradient condition and the vehicle speed condition while driving downhill, thereby reducing shift shock during manual downshift for engine brake application, improving shift responsiveness and improving shifting feeling. Can be.

As described above, the manual downshift control method of the automatic transmission for a vehicle is performed by shifting the steel sheet according to the gradient condition and the vehicle speed condition when the manual downshift is used to use the engine brake when driving downhill in a driving vehicle. Shock can be reduced, responsiveness can be improved, and the speed of shift can be improved.

Claims (8)

Determining a shift condition in a driving vehicle; Determining a driving road condition if the shift condition is a manual downshift condition in the step; And outputting a predetermined shift control signal for controlling the shift stage according to the driving condition and the driving vehicle speed condition when the driving road condition is a steel road driving condition in the step. The manual downshift control method for an automatic transmission for a vehicle according to claim 1, further comprising outputting a normal duty control signal according to the driving condition when the driving road condition is not the driving condition with the steel plate. The method of claim 1, further comprising: determining whether the vehicle speed of the traveling vehicle is a vehicle speed included in the predetermined first setting range when it is determined that the driving condition is a road condition included in the first predetermined range by the steel plate of the traveling vehicle; ; If it is determined in the step that the driving vehicle speed is within the predetermined first setting range, and outputs the down shift duty control signal corresponding to the duty value calculated by adding the first correction duty to the current duty Da How to control the manual downshift of a vehicle automatic transmission. 4. The method of claim 3, further comprising: determining whether the vehicle speed of the traveling vehicle is within the predetermined second setting range when the vehicle speed of the traveling vehicle is not within the predetermined first setting range; If it is determined in the step that the vehicle speed of the traveling vehicle is within the predetermined second setting range, and outputting the down shift duty control signal corresponding to the duty value calculated by adding the second correction duty to the current duty Manual downshift control method for an automatic transmission for a vehicle, characterized in that. The downshift duty control signal according to claim 4, wherein when the vehicle speed of the traveling vehicle is not included in the predetermined second setting range, the down shift duty control signal corresponding to the duty value calculated by adding the third correction duty to the current duty is output. Manual downshift control method for a vehicle automatic transmission characterized in that. The method of claim 1, further comprising: determining whether the vehicle speed of the traveling vehicle is within the predetermined first setting range when the steel sheet of the traveling vehicle determines that the driving condition is a road condition within the predetermined second setting range; ; If it is determined in the step that the driving vehicle speed is within the predetermined first setting range, the down shift duty control signal corresponding to the duty value calculated by adding the fourth correction duty to the current duty Da is output. Manual downshift control method of automatic transmission for vehicles. The method of claim 6, further comprising: determining whether the vehicle speed of the travel vehicle is within the predetermined second setting range when the vehicle speed of the traveling vehicle is not within the predetermined first setting range; If it is determined in the step that the vehicle speed of the driving vehicle is within the predetermined second setting range, and outputting the down-shift duty control signal corresponding to the duty value calculated by adding the fifth correction duty to the current duty Manual downshift control method for an automatic transmission for a vehicle, characterized in that. The downshift duty control signal according to claim 7, wherein the downshift duty control signal corresponding to a duty value calculated by adding and calculating a sixth correction duty to the current duty when the vehicle speed of the traveling vehicle is not included in the second predetermined range. Manual downshift control method for a vehicle automatic transmission characterized in that.