KR19980047942A - Shift control method during power-off / downshift - Google Patents

Abstract

The present invention relates to a shift control method during power-off / downshifting. When a shift occurs in which a shift pattern is changed by the throttle valve opening amount and the vehicle speed during driving, the state of the power is determined by the throttle valve opening amount and the engine speed value. When the state of the power is off by determining that the throttle valve opening amount is greater than or equal to the set reference value, and when the throttle valve opening amount is greater than or equal to the set reference value, it is determined that there is a driver's willingness to accelerate and does not perform the shift control. When the opening amount of the throttle valve is less than or equal to the set reference value, the solenoid valve switching time T is set as shown in Fig. 3 by calculating by the set arithmetic formula, and it is determined whether the set solenoid valve switching time T has elapsed, and the solenoid valve If the switching time T has elapsed, the actual solenoid valve drive By force, there is an effect to improve the operation ease and relaxed up or down the transmission speed change shock at the power-off state.

Description

Shift control method during power-off / downshift

The present invention relates to a shift control method during power-off / downshifting. More particularly, the present invention relates to shifting through a shift point on a shift pattern in order to reduce shift shock when shifting up or down in a state in which an automatic transmission is turned off. In the case of outputting a command, the present invention relates to a shift control method during power-off / downshifting to reduce shift shock during shifting by adjusting the actual solenoid valve switching time according to the throttle valve opening amount.

In general, a vehicle equipped with an automatic transmission controls the hydraulic pressure within a shift range set according to the driving speed of the vehicle so that the shift gear of the target shift stage may be automatically operated.

Therefore, the torque converter is operated according to the output power of the engine to control the rotational force of the fluid, and according to the control signal applied from the shift controller so that the shift gear according to the operating state of the vehicle can be operated. Hydraulic pressure acts on the valve to allow shifting.

Therefore, a vehicle equipped with an automatic transmission in which the operating state is controlled according to the hydraulic pressure does not require the operation of a clutch pedal to cut off power from the engine in order to change the operating state of the corresponding shift gear. Fatigue can be reduced, and an engine stall is not generated due to a malfunction of the driver or an immature driving during driving, so that even a beginner can easily operate a driving operation.

Therefore, the automatic transmission receives a fluid pressure from the oil pump by changing the port according to the selected position of the driver's shift lever, and the operating state of the hydraulic valve is changed by the fluid pressure so that any one of the gear stages of the transmission gear mechanism is shifted. Controls the operating state of the hydraulically actuated friction element for selecting stages.

The selective operation of the friction element consisting of a clutch or a brake switches the operation of the planetary gear unit, which is then transmitted to the drive gear after an appropriate transmission ratio is made.

When the shifted power is transmitted to the drive gear, the shifted power is transmitted to the driven gear geared to the longitudinal reduction gear by the driven gear geared to the drive gear, thereby controlling the rotational movement of the wheel.

As described above, the target shift stage is determined according to the driving state of the vehicle, and when the control operation to the determined target shift stage is executed, the corresponding friction element is operated for each target shift stage among friction elements consisting of a clutch or a brake. Let's do it.

In the automatic transmission having a multiple speed ratio as described above and a control means capable of adjusting the step switching, the power state is conventionally performed when the shift stage is shifted up or down to the set target shift stage in the power-off state. Shift control was performed only in the on state.

However, the above-described conventional technique has a problem in that the shift stage feels a shift shock for each stage switching when the shift stage performs the up or down shift to the target shift stage when the driving state is the power-off state.

Therefore, in order to solve the above-mentioned conventional problems, as shown in FIG. 2 attached to the throttle valve opening amount and the shift speed of the shift pattern is changed by the vehicle speed, the throttle valve opening amount as shown in FIG. When the state of the power is judged by the value of the engine speed, and the state of the power is off, it is determined whether the throttle valve opening amount is more than the set reference value, and when the throttle valve opening amount is more than the set reference value, it is determined that there is a driver's willingness to accelerate. If the throttle valve opening amount is equal to or less than the set reference value without performing the shift control, the solenoid valve switching time T is set as shown in FIG. 3 by calculating by a set arithmetic expression, and the solenoid valve switching time set above is set. It is judged whether T has elapsed and solenoid valve switching time T has elapsed. By outputting the actual solenoid valve driving command, it is to provide a shift control method during power-off up / down shifting to alleviate an up or down transmission shift shock in a power-off state to improve driving convenience.

1 is a graph of power state determination criteria during power-off up / down shifting according to an embodiment of the present invention;

2 is a shift pattern diagram during power-off up / down shifting according to an embodiment of the present invention;

3 is a graph illustrating a timing for switching a solenoid valve by shift control during power-off / down shift according to an embodiment of the present invention.

4 is a graph showing a state of engine speed change according to a time change by shift control during power-off / downshifting according to an embodiment of the present invention;

5 is a block diagram of a shift control apparatus during power-off / downshifting according to an embodiment of the present invention;

6 is a flowchart illustrating a method of controlling a shift during power-off / downshifting according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention, which can be achieved and realized in detail by the above objects, will be described in detail with reference to the accompanying drawings.

As shown in FIG. 5, the configuration of the shift control apparatus at the time of power-off up / down shifting according to the embodiment of the present invention;

A vehicle driving state detecting means 10 which receives a signal that is variable and output according to a driving state of the vehicle and outputs a corresponding electric signal;

When a shift is generated by receiving a signal output from the vehicle driving state detecting means 10 and a shift is generated, the solenoid valve switching time is set by determining whether the opening amount of the throttle valve is greater than or equal to a set reference value. Control means (20) for outputting a solenoid valve drive control signal when the solenoid valve switching time set in S elapses;

Receives a control signal output from the control means 20 is composed of a drive means 30 for driving a solenoid valve to shift the shift stage to the target shift stage without shift shock in accordance with the shift will before operation.

In the above, the vehicle driving state detection means 10;

A throttle valve opening detection unit 11 for detecting an opening degree of a throttle valve whose opening / closing state is variable in association with an operation state of the accelerator pedal and outputting a corresponding signal;

A vehicle speed detector 12 which detects a driving speed of the vehicle and outputs a corresponding signal;

A shift stage detecting unit 13 for detecting a variable state of the shift stage and outputting a corresponding signal when the shift stage is changed according to the throttle valve opening amount and the vehicle speed;

An engine rotation speed detection unit 14 for detecting a rotation speed of the crankshaft which is varied according to an operating state of the engine and outputting a corresponding signal;

Turbine shaft rotation speed detection unit 15 for detecting the rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and outputs a corresponding signal.

Therefore, when the vehicle starts to run, the control means 20 determines whether the corresponding shift has been generated by setting the gear stage according to the shift pattern diagram as shown in FIG. 2 by the opening amount of the throttle valve and the engine speed. (S100).

When shifting occurs in the above, the control means 20 determines whether the power is on or off, as shown in FIG. 1 attached by the current throttle valve opening amount and the engine speed (S110). .

When the state of the power is off in the above, the control means 20 determines whether the value of the throttle valve opening amount is 10% or more of the set reference value (S120).

When the value of the throttle valve opening amount is 10% or more, which is the set reference value, the control means 20 determines that the driver has an intention to accelerate, and stops the shift control and returns to the main routine.

However, when the value of the throttle valve opening amount is 10% or less of the set reference value, the solenoid valve switching time T shown in FIG. 3 is calculated and calculated by the set arithmetic equation (S130).

Referring to FIG. 3 with the method of calculating the solenoid valve switching time T above, as shown in Table 1 below, when the shift stage is changed from 1 speed to 2 speeds, the solenoid valve 2 (S / When the throttle valve opening amount is greater than 10% of the set reference value, the control signal for switching the power state from on to off at the conversion point is output as shown in FIG. When the throttle valve opening degree of solenoid valve 1 (S / V 1) is 0%, a control signal for switching from on to off after the set T seconds (20 ms) is output.

TABLE 1

Therefore, the method of setting the solenoid valve switching time T in the above is the (throttle valve opening degree, delay time) of the solenoid valve 2 (S / V # 2) and the (throttle valve opening degree) of the solenoid valve 1 (S / V # 1). , Delay time) becomes (0,20) (10,0);

In relation to

A relation of T = -2X +20 is obtained.

In the above, T is a shift delay time (ms) and X is a throttle opening amount (%).

Therefore, when the opening amount of the throttle valve is 5%, the shift delay time T = -2 × 5 + 20, so that the shift delay time is 10 (ms).

As the solenoid valve switching time T is set in the above, the control means 20 determines whether the solenoid valve switching time T set above has passed (S140).

When the solenoid valve switching time T has elapsed, the control means 20 outputs the actual solenoid valve drive control signal to the drive means 30 (S150).

Therefore, as shown in FIG. 4, at the point A, which is a shift point on the shift pattern, a decrease time is naturally given to the point B (engine RPM after 20ms) when the engine RPM naturally decreases, and the engine torque drops due to the engine RPM dropping. To shift the gearshift.

The above embodiments are described as the most preferred embodiments, and the present invention is not limited thereto, and the embodiments can be easily described from the above embodiments.

As described above, when a shift in which the shift pattern is changed by the throttle valve opening amount and the vehicle speed occurs while driving, the state of the power is turned off by judging the state of the power based on the throttle valve opening amount and the engine speed. When the throttle valve opening amount is greater than or equal to the set reference value, and if the throttle valve opening amount is greater than or equal to the set reference value, if it is determined that the driver is willing to accelerate, the shift control is not performed and the throttle valve opening amount is less than or equal to the set reference value. When the solenoid valve switching time T has elapsed by setting the solenoid valve switching time T as shown in Fig. 3 by calculating by the set arithmetic formula and determining that the above-described solenoid valve switching time T has elapsed, By outputting the actual solenoid valve drive command, It is possible to provide a shift control method during a power-off up / down shift having an effect of improving shift convenience when shifting up or down shifts.

Claims (4)

In the automatic transmission with multi-stage transmission ratio, the sensing means for distinguishing the power on / off shift state, and the automatic transmission with control means for controlling the converting means, And shifting a time point at which the actual speed change stage is converted, not at the conversion point on the speed shift pattern diagram. The method of claim 1, further comprising: setting a shift stage at which the shift pattern is changed by the throttle valve opening amount and the vehicle speed when the vehicle starts to run, and determining whether a corresponding shift signal is output; Determining the state of power based on the current throttle valve opening amount and the engine speed when the shift signal is output; Determining whether the value of the throttle valve opening amount is equal to or less than a set reference value when the power state is off; Calculating and calculating the solenoid valve switching time T by a set arithmetic expression when the value of the throttle valve opening amount is equal to or less than a set reference value; Determining whether the set solenoid valve switching time T has elapsed by setting the solenoid valve switching time T in the above; And outputting an actual solenoid valve driving control signal when the solenoid valve switching time T has elapsed. The shift control at the time of power-off up / down shifting according to claim 1, wherein when the value of the opening amount of the throttle valve is equal to or higher than the set reference value, it is determined that the driver is willing to accelerate and the shift control is stopped and returned to the main routine. Way. The method of calculating the solenoid valve switching time T is the throttle valve opening degree of the solenoid valve 2 (S / V # 2) and the throttle valve opening of the solenoid valve 1 (S / V # 1). And a solenoid valve switching time in accordance with the condition of the throttle valve opening amount in the linear relationship between the highest setting and the lowest setting with a linear relationship of delay time).