KR20010056922A - Sudden acceleration-preventing device for automatic transmission-equipped vehicle and method thereof - Google Patents

Abstract

PURPOSE: A rapid start preventing device of an automatic transmission for a vehicle and the method thereof prevent the rapid start of a vehicle by exhausting an oil pressure provided to frictional elements operated on an advance first speed gear and a reverse gear. CONSTITUTION: Drain solenoid valves controlled by a transmission controlling unit are disposed on respective pipe paths of frictional elements operated on an advance first speed gear and a reverse gear. Thus, if the range converting motion of a select lever for starting is made on a state when a rapid start is caused, the oil pressure of a corresponding frictional element is exhausted, thereby forbidding the start of a vehicle.

Description

Rapid start prevention device and control method of automatic transmission for vehicle {SUDDEN ACCELERATION-PREVENTING DEVICE FOR AUTOMATIC TRANSMISSION-EQUIPPED VEHICLE AND METHOD THEREOF}

The present invention relates to a rapid start prevention device and a control method of the automatic transmission for a vehicle, and more particularly, to discharge the hydraulic pressure supplied to the friction element when the manual shift is made for starting when the pedal is stepped on or when the RPM is higher than the reference value above the engine The present invention relates to a sudden start prevention device and a control method of an automatic transmission for a vehicle that can prevent a safety accident in advance.

For example, an automatic transmission for a vehicle may include a hydraulic power converter for selecting any one of a torque converter, a multi-speed transmission mechanism connected to the torque converter, and a shift stage of the transmission gear mechanism according to the driving condition and load variation of the vehicle. Hydraulic control system for controlling the friction element is provided.

Accordingly, the hydraulic control system is operated according to the change in the traveling speed and the load of the vehicle, thereby appropriately controlling the friction elements installed in the transmission gear mechanism, thereby automatically shifting.

Unlike the general manual transmission in which the driver manually shifts the automatic transmission as described above, a mechanism that automatically shifts is applied. As a result, each solenoid valve that controls hydraulic pressure by the influence of electromagnetic waves from the outside malfunctions. Contrary to the will, there are many opinions that the vehicle may start suddenly while starting or slowing, causing collisions and collisions.

However, in the hydraulic control system applied to the automatic transmission, it is configured to hold at three speeds when a failure occurs, and the hydraulic pressure that ultimately activates the friction element that shifts is configured to be finally supplied by the driver's select lever range change. As a result, there is little possibility of sudden start and fall under normal driving conditions.

Therefore, if you look at the causes of the sudden start other than the starting start due to the malfunction of the body of the automatic transmission,

First, when the driver presses the accelerator pedal, change the range of the select lever,

Second, when the engine is not warmed up enough and the idling speed of the engine is higher than the normal value, the range shift is performed,

Third, the driver habitually touches the accelerator pedal lightly and repeatedly, affecting the electronic control unit that controls the engine, and a large amount of fuel is supplied to increase the engine speed at once.

Fourth, for example, a case of suddenly starting the engine by temporarily increasing the engine speed to compensate for the load during the range conversion, by performing a range change without applying the brake for starting. If you start suddenly, this is due to the driver's immaturity, not the cause of the sudden transmission itself.

Accordingly, the applicant has studied the causes of the sudden start, and as a result, if the sudden start occurs differently from the driver's will due to the cause and the malfunction of the automatic transmission or the electromagnetic waves, the vehicle may be used for whatever reason. Recognizing that it would not be a departure from itself would become a fundamental cure.

Therefore, the present invention, when the current state of the vehicle can be induced to sudden start, by discharging the hydraulic pressure supplied to the friction elements operating in the forward 1 speed and the reverse shift stage, thereby preventing the sudden start of the vehicle in advance and thus safety It is an object of the present invention to provide a sudden start prevention device for an automatic transmission vehicle and a control method thereof to prevent an accident from occurring in advance.

1 is an embodiment of a hydraulic control system to which the present invention is applied.

2 is a block diagram for operating the present invention.

3 is a control flowchart of the present invention.

In order to achieve this, the present invention provides hydraulic control of an automatic transmission in which a shift is automatically performed by selectively operating a plurality of friction elements installed in a transmission gear mechanism by hydraulic control according to a change in a traveling speed and a load of a vehicle. In the system,

Advancing the first and second drain solenoid valves controlled by the transmission control unit according to the information provided by the sensing means consisting of a throttle position sensor, an engine speed sensor, a brake actuation switch, and a select lever position sensor. Provided is a rapid start prevention device for an automatic transmission for a vehicle, characterized in that it is arranged on each of the hydraulic supply line of the friction element operating in the first speed and the reverse shift stage.

Determining whether the brake lever is in the select lever " N " range according to the electrical signal input from the brake operation switch and the select lever position sensor;

If it is determined in the step that the brake pedal is not stepped on and the select lever is in the "N" range position, the throttle opening angle is opened above the reference value according to the signals input from the throttle opening degree sensor and the engine speed sensor, and the engine rotation Determining whether the number is greater than or equal to the reference rotational speed;

Determining that the select lever is switched from the N range to the D or R range if it is determined that at least one of the two elements is equal to or greater than the reference value in the above step;

In this step, when it is determined that the select lever is converted to the D range, the first drain solenoid valve disposed on the conduit of the forward 1 speed friction element is operated, and when it is determined that the select lever is converted to the R range, It provides a control method for preventing the starting start of the automatic transmission for a vehicle, characterized in that it comprises the step of operating the second drain solenoid valve disposed on the conduit.

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

First, a general configuration of a hydraulic control system applied to an automatic transmission will be described. As shown in FIG. 1, an oil pump 2 that always generates hydraulic pressure during engine operation, and a torque converter for transmitting engine power to an input shaft of a transmission (4), a regulator valve 6 for adjusting the oil pressure generated by the oil pump to a constant oil pressure, that is, a line pressure, a torque converter control valve 8 for adjusting the oil pressure for the torque converter and lubrication, and a torque converter. The damper clutch control valve 10 which controls the hydraulic pressure acting on the damper clutch provided in the inside is comprised.

And a reducing valve 12 for producing a constant hydraulic pressure lower than the line pressure, a manual valve 14 for switching the flow path in conjunction with the shift lever position and sending or discharging the line pressure to each valve, and two shift controls. The shift control valve 16 which switches a flow path by the ON / OFF action of solenoid valve S1, S2 is included.

It also has pressure control valves 18 and 20 that are controlled by pressure control solenoid valves S3 and S4 to prevent shock from shifting, so that shocks from shifting from the neutral range to the reverse range are prevented. The NR control valve 22 is prevented.

In addition, the 1-2 shift valve 24 controls the flow of the line pressure when the gear shifts from 1 to 2 speeds, and controls the hydraulic passage connected to the friction element acting when the reverse gear is operated. It has a 2-3 / 4-3 shift valve 26 which supplies the release pressure to the second friction element C2 and the supply pressure to the third friction element C3.

In addition, it has an end clutch valve 28 for supplying the working pressure to the fourth friction element C4 and a fifth friction element C5 which is operated by receiving hydraulic pressure directly from the manual valve 14 in the reverse range.

And discharges the operating hydraulic pressure of the first friction element C1 when shifting from the third speed to the fourth speed, and controls the time of the hydraulic pressure supplied to the first friction element C1 when shifting from the fourth speed to the third speed to prevent the occurrence of shock. The rear clutch release valve 30 which prevents is hold | maintained.

Accordingly, the friction elements are selectively operated according to the respective shift stages, thereby controlling the operating elements of the power train (not shown), thereby automatically shifting.

In such a hydraulic control system, the present invention provides the first and second drain solenoid valves on the conduits of the first friction element C1 operating in the first forward speed and the fifth friction element C5 operating in the reverse shift stage. DS1) (DS2) was placed.

In the above, the first and second drain solenoid valves DS1 and DS2 are controlled by a transmission control unit, and a control system thereof is formed as in FIG. 2.

As the detection means, a throttle position sensor 50 for detecting the opening degree of the throttle valve linked to the accelerator pedal, an engine speed sensor 52 for detecting the engine speed, and a brake operation switch 54 for detecting whether the brake is operated or not. And, the range position of the select lever is made of a select lever position detection sensor 56 for sensing, and each of the electrical signals detected by them is input to the transmission control unit (TCU).

Then, the transmission control unit TCU compares these signals with the previously input data to operate the alarm 58 and the first and second drain solenoid valves DS1 and 2 which are operating means.

The control method according to the present invention made as described above is made in the flow as shown in FIG.

First, when the operation is started, in the first step S11, the select lever “N” in a state where the brake pedal is not stepped on in accordance with an electrical signal input from the brake actuation switch 54 and the select lever position sensor 56. It is determined whether it is in the range position.

If it is determined at this stage that the brake pedal is in a state where the brake pedal is not depressed, in the second step S12, according to the signals input from the throttle opening degree sensor 50 and the engine speed sensor 52, It is determined whether the throttle opening angle is open above the reference value (X%), and whether the engine speed is above the reference speed (Yrpm).

At this time, if it is determined that both elements are less than the reference value, normal control is made, and if it is determined that at least one of the two elements is more than the reference value, in the third step (S3), the select lever in the N range D or It is determined whether to convert to the R range.

When the select lever is converted to the D range or the R range in the step, the first and second drain solenoid valves DS1 and DS2 are driven in the fourth step S4. By operating the second drain solenoid valve DS2 when the ground first drain solenoid valve DS1 is converted to the R range, the hydraulic pressure supplied to the first and fifth friction elements C1 and C5 is discharged. It is to prevent the departure.

As described above, according to the present invention, a drain solenoid valve controlled by a transmission control unit is disposed on each conduit of a friction element operating at the forward 1 speed and the reverse shift stage, so that the start for starting in a state that causes a sudden start When the range select operation of the select lever is performed, the hydraulic pressure of the friction element is discharged so that starting does not occur essentially, thereby preventing accidents caused by rapid start and departure in a vehicle equipped with an automatic transmission, thereby improving stability. will be.

Claims (3)

In a hydraulic control system of an automatic transmission in which a shift is automatically performed by selectively operating a plurality of friction elements installed in the transmission gear mechanism by hydraulic control according to a change in a vehicle's traveling speed and load, Advancing the first and second drain solenoid valves controlled by the transmission control unit according to the information provided by the sensing means consisting of a throttle position sensor, an engine speed sensor, a brake actuation switch, and a select lever position sensor. A first start prevention device for an automatic transmission for a vehicle, characterized in that the arrangement is made on the hydraulic supply line of the friction elements operating in the first and second speed shift stages. Determining whether the brake lever is in the select lever " N " range according to the electrical signal input from the brake operation switch and the select lever position sensor; If it is determined in the step that the brake pedal is not stepped on and the select lever is in the "N" range position, the throttle opening angle is opened above the reference value according to the signals input from the throttle opening degree sensor and the engine speed sensor, and the engine rotation Determining whether the number is greater than or equal to the reference rotational speed; Determining that the select lever is switched from the N range to the D or R range if it is determined that at least one of the two elements is equal to or greater than the reference value in the above step; In this step, when it is determined that the select lever is converted to the D range, the first drain solenoid valve disposed on the conduit of the forward 1 speed friction element is operated, and when it is determined that the select lever is converted to the R range, And controlling the second drain solenoid valve disposed on the conduit. The method of claim 2, wherein an alarm sound generation step is added between the range change determination step and the step of operating the first and second solenoid valves.