KR100302301B1 - Apparatus and method for controlling change of speed in automatic transmission - Google Patents

Abstract

PURPOSE: An apparatus and method for controlling the change of speed in an automatic transmission are provided to improve comfortability in the change of speed by smoothly changing speed without a shock of the change of speed. CONSTITUTION: An apparatus for controlling the change of speed in an automatic transmission is composed of a detecting unit(10) for the driving state of a vehicle which outputs an electronic signal according to the driving state of the vehicle; a TCU(Transmission Control Unit)(20) which outputs a duty control signal of down shift from fourth speed to second speed; a first actuator(31) which releases a fourth gear speed pressure applied on an end clutch by the duty control signal of down shift from fourth speed to second speed; and a second actuator(32) providing a rear clutch with a second gear speed pressure by the duty control signal of down shift from fourth speed to second speed.

Description

Transmission control device and method of automatic transmission

The present invention relates to a shift control apparatus and a method of an automatic transmission. More specifically, the driver shifts the shift lever of a power-on 4-speed vehicle from a D range to a 2 range so that the shift stage is changed from 4 speeds to 2 speeds. The present invention relates to a shift control apparatus and a method of an automatic transmission for controlling an automatic transmission when a power state is changed from on to off by operating an accelerator pedal of a manipulator during downshifting.

In general, in a vehicle equipped with an automatic transmission, when the shift lever is located at the D range and the vehicle is traveling at four speeds, the driver decelerates the vehicle speed at a constant speed by using a brake when the vehicle speed is to be reduced according to the driver's deceleration will. In this case, the automatic transmission downshifted the speed change gear from the 4th speed to the desired speed change speed according to the speed change pattern stored in the memory.

However, unlike the above, when the driver changes the shift lever from the D range to the 2 range and simultaneously depresses the accelerator pedal without using the brake to decelerate the vehicle speed in a four-speed vehicle, it is conventionally shown in FIG. As shown in (b), the vehicle was driven by performing the power-on 4 → 2 shift control stored in the memory.

However, in the above-described conventional technique, the control logic is precisely controlled when the driver shifts the shift lever from the D range to the 2 range at the same time and presses the accelerator pedal without using the brake to decelerate the vehicle speed for four weeks. By outputting the power-on 4 → 2 shift control duty stored in the memory because it is not made, there is a problem that the vehicle speed of the vehicle is temporarily increased and then decelerated without the vehicle deceleration in accordance with the driver's deceleration intention.

Therefore, an object of the present invention is to solve the above problems, if the driver converts the shift lever from the D range to the second range during the four-speed drive, and then operate the accelerator pedal to change the power state from power on to off It is to provide a shift control device and a method of the automatic transmission that can improve the shifting feeling by smoothly shifting without shift shock when shifting by applying a manual power-off 4 → 2 downshift shift control corresponding thereto. .

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

2 is a flowchart illustrating a shift control method of an automatic transmission according to an embodiment of the present invention;

3 is a hydraulic circuit diagram of an automatic transmission according to an embodiment of the present invention,

4A and 4B are shift control duty pattern diagrams of an automatic transmission according to an exemplary embodiment of the present invention.

5A and 5B are shift control duty pattern diagrams of a conventional automatic transmission.

The present invention for achieving the above object,

Vehicle driving state detection means for detecting a signal that is variable and output according to a driving state of the vehicle and outputting the signal as a corresponding electric signal;

The electric power output from the vehicle driving state sensing means receives a predetermined power stored in the memory by detecting a time point at which the state of power is changed during power-on 4 → 2 downshift shifting by a shift lever operation of a driver. A TCU outputting an off 4? 2 downshift duty control signal;

A first actuator which releases the four-speed pressure acting on the end clutch (E / C) by receiving the power-off 4? 2 downshift shift duty control signal output from the TCU;

And a second actuator for supplying and coupling the second speed pressure supplied from the oil pump to the rear clutch R / C by receiving the power-off 4 → 2 downshift shift duty control signal output from the TCU. .

Another invention for achieving the above object,

Outputting a power-on 4-> 2 downshift shift control signal stored in a memory when the shift lever is converted from the D range to the 2 range while the 4 speed drive is performed;

Determining a power state according to a driver's accelerator pedal operation during power-on 4? 2 downshift shifting;

Determining whether the engagement duty is 100% output to the second actuator when the power state determined in the step is power off;

If the power-off signal according to the accelerator pedal operation of the driver is output while the engagement duty of 100% is output to the second actuator in the step, the engagement duty of 100% is output to the second actuator for a predetermined time t2. And outputting a power-off 4? 2 downshift shift control signal for lowering and outputting the engagement duty to 0% when the predetermined time t2 elapses.

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. 1, a configuration of a power-off shift control apparatus for manual power-on 4 → 2 shifting of an automatic transmission according to an exemplary embodiment of the present invention is described below.

A vehicle driving state sensing means 10 for detecting a signal that is variable and output according to a driving state of the vehicle and outputting the signal as a corresponding electric signal;

Receiving an electric signal output from the vehicle driving state sensing means 10 detects the time when the shift stage is changed to the power-off state during power-on 4 → 2 downshift shifting by the shift lever operation of the driver and stored in the memory A TCU 20 for outputting a predetermined power off 4? 2 down shift duty control signal;

The actuator 30 is configured to receive a power-off 4 → 2 downshift shifting duty control signal output from the TCU 20 to perform shifting.

In the above configuration, the vehicle driving detecting 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 an output shaft rotational speed of the vehicle and outputs a corresponding signal corresponding to the traveling speed of the vehicle;

A turbine shaft rotation speed sensing unit 13 for sensing a rotation speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and outputting a corresponding signal;

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;

An accelerator pedal switch 15 for outputting a variable on / off signal of the switch according to an accelerator pedal operation state of a driver;

The shift lever detection unit 16 detects a position that is variable according to the shift lever operation of the driver and outputs a corresponding signal.

In addition, in the above-described configuration, the actuator 30

A first actuator 31 duty-controlled by the engagement duty control signal output from the TCU 20 to release the four speed pressure acting on the end clutch E / C;

The second actuator 32 is duty controlled to the engagement duty control signal output from the TCU 20 to supply and couple the second speed pressure supplied from the oil pump to the rear clit R / C.

The power-off control method during power-on 4 → 2 shifting of the automatic transmission according to the embodiment of the present invention made by the above configuration will be described with reference to FIG. 2.

When the driver changes the shift lever from the D range to the 2 range in a vehicle traveling at 4 speeds in the D range, the TCU 20 determines whether a manual power-on 4 → 2 shift control signal is output (S10 and S50).

When the shift lever is changed from the D range to the 2 range by the driver and the manual power-on 4 → 2 shift control signal is output, the TCU 20 turns on the power-on stored in the memory as shown in FIG. The actuator 30 outputs the duty control signal corresponding to section A of the 4? 2 downshift shift control signal (S100).

The signal output from the TCU 20 to the pressure control solenoid valve (PCSW) that is the actuator 30 is as follows.

When the driver converts the shift lever to the second range while driving the power-on 4 speed, the TCU 20 outputs the PCSV-A power-on 4 → 2 downshift initial duty Drs, which is the first actuator 31, and the second actuator 32. 100% of engagement duty is output to the PCSV-B.

Accordingly, PCSV-A, which is the first actuator 31 of the actuator 30, is duty-controlled by the initial duty Drs value according to the power-on 4-> 2 downshift shift control duty signal output from the TCU 20. Release the four speed pressure acting on the illustrated end clutch (E / C).

In addition, the second actuator 32 PCSV-B is duty controlled according to the 100% power 4? 2 downshift duty signal output from the TCU 20, and as shown in FIG. 3, the rear clutch exhaust valve (Rear Clutch Exhaust) The fourth speed pressure supplied to the valve is released and the pod of the rear clutch exhaust valve is switched to the second speed.

As described above, the driver operates the accelerator pedal when the driver shifts the shift lever from the D range to the 2 range and then performs the power-on 4 → 2 downshift shift control at the shift stage. The TCU 20 is in a state of power. It is determined whether the power is varied from the power on to the power off (S110).

If it is determined that the state of the power according to the driver's accelerator pedal operation is changed from power on to power off, the TCU 20 determines whether 100% engagement duty is continuously output to the second actuator 32 PCSV-B. Determine (S120).

That is, as shown in Fig. 3A, a 100% engagement duty is output from the TCU 20 to the PCSV-B, which is the second actuator 32, to release the four speed pressure acting on the rear clutch exhaust valve. This is to determine whether the power state is changed from power on to power off by the driver's accelerator pedal operation during the duty control.

Therefore, even if the power state according to the driver's accelerator pedal operation is changed from the power on to the power off, if the TCU 20 determines that 100% of engagement duty is output to the second actuator 32 PCSV-B, the TCU ( 20) continuously outputs 100% engagement duty for a predetermined time t2 set in the second actuator 32 to completely release the four-speed pressure acting on the rear clutch exhaust valve, and the first actuator 31, PCSV-A. A sustain duty Da2 for constantly releasing the control pressure acting on the end clutch E / C for the power-off 4? 2 downshift is output (S130).

As described above, the TCU 20 continuously determines whether the set predetermined time t2 has elapsed while continuously outputting the 100% engagement duty for the predetermined time t2 set in the second actuator 32 PCSV-B (S140). .

When the predetermined time t2 for continuously outputting 100% engagement duty to the second actuator 32 PCSV-B has elapsed, the TCU 20 lowers the duty value by 0% for tf for a predetermined time. It outputs to the 2nd actuator 32 (S150).

When the TCU 20 outputs a duty to the PCSV-B of the second actuator 32 at 0%, it starts to supply the line pressure supplied from the oil pump to the rear clutch R / C.

However, when the predetermined time t2 for continuously outputting the 100% engagement duty to the second actuator 32 PCSV-B does not pass, the TCU 20 continues to operate the second actuator 32 PCSV-B. Returning to step S130 of outputting the 100% engagement duty.

However, after the predetermined time t2 set above has elapsed, the duty is lowered to 0% in the second actuator 32 PCSV-B to supply a predetermined amount of line pressure to the rear clutch R / C for a predetermined time tf. As it starts, the TCU 20 determines whether tf, which is the predetermined predetermined time, warns (S160).

When tf, which is a predetermined time set by lowering the duty to 0% in the PCSV-B which is the second actuator 32, the TCU 20 is the second actuator 32 for the rapid rise of the turbine NT. The line pressure supplied to the rear clutch R / C is reduced by outputting the engagement duty with the duty value Db1 and the slope a to PCSV-B (S170).

In the above-described TCU 20, which outputs the engagement duty with the duty value Db1 and the slope a to the PCSV-B, which is the second actuator 32, and rapidly raises the turbine Nt, the shift stage is a target shift stage. It is determined whether the shift is started (S, B) inward (S180).

The method of determining whether the shift stage starts shifting at the second speed, which is the target shift stage (S.B), may be determined by Equation 1 below.

[Equation 1]

Thread Nt ≥ △ Nt1

(In the above, the actual Nt is the value of the current turbine Nt, ΔNt1 is the fourth speed Nt + 70rpm.)

Therefore, when it is determined that the shift stage starts shifting at the second speed, which is the target shift stage (SB), the TCU 20 increases the duty value to Δd and sets the engagement duty of the slope ß to the second actuator 32. It outputs to PCSV-B which is (S190).

호 하는 계합듀티 출력단계(S170)를 계속 수행한다.However, if it is not determined that the shift stage starts shifting to the 2nd speed, which is the target shift stage (SB), the duty is shifted to Db1 until it is determined that the shifting stage starts shifting to the 2nd speed, which is the target shift stage (SB). And tilt

The call continues the engagement duty output step (S170).

기울기로 계합듀티를 출력하여 파워 오프 4 →2 다운 쉬프트를 수행중인 TCU(20)는 변속단이 목표 변속단으로 변속을 완료되었는가를 판단한다(S200).However, it is determined that the shift stage starts shifting to the second shift speed (SB), which is the target shift stage.

The TCU 20 outputting the engagement duty with the slope and performing the power-off 4?

The method of determining whether the shift stage is shifted to the target shift may be determined by Equation 2 below.

[Equation 2]

Thread Nt ≥ △ Nt2

(In the above, the actual Nt is the value of the current turbine Nt, and ΔNt2 is the second speed. Nt-50 rpm.)

Therefore, when the shift stage is determined that the shift is completed to the target shift stage, the TCU 20 increases the Δd in step S190 as shown in FIG. After outputting to the second actuator PCSV-B during t3, the power-off 4 → 2 downshift duty control is terminated (S210 and S220).

However, unlike the above (S120), as shown in FIG. 4 (b), the time when the power state according to the driver's accelerator pedal operation is changed from power on to power off is 100% for the PCSV-B which is the second actuator 32. If it is determined that the TDU 20 outputs the engagement duty of 0% in order to release the four speed pressure acting on the rear clutch exhaust valve after the engagement duty of the output is output, the TCU 20 determines the first actuator ( 31) Outputs engagement duty Da2 to PCSV-A, and outputs 0% engagement duty to the second actuator 32 PCSV-B for a predetermined time tf to completely output the four-speed pressure acting on the rear clutch exhaust valve. After the release step (S150) is performed in the same way.

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, the shift control apparatus and the method of the automatic transmission according to the embodiment of the present invention, the driver shifts the shift lever of the four-speed driving vehicle from the D range to the 2 range, and the shift stage is powered on. If the power state is changed to power-off due to the accelerator pedal operation during operation, the manual power-off 4 → 2 downshift shift control signal is outputted and the duty control is performed from the time when the power state is changed to smooth the shift without shift shock. There is an effect to perform, and to improve the feeling of shifting.

Claims (5)

An automatic transmission comprising: a vehicle driving state detecting means for detecting a signal that is variable and output according to a driving state of a vehicle and outputting the signal as a corresponding electric signal; A predetermined power stored in the memory is detected by detecting the time when the shift stage is changed to the power-off state during power-on 4 → 2 downshift shifting by receiving the electric signal output from the vehicle driving state sensing means. A TCU outputting an off 4? 2 downshift duty control signal; A first actuator configured to release the four-speed pressure acting on the end clutch (E / C) by receiving the power-off 4? 2 downshift shift duty control signal output from the TCU; And a second actuator configured to receive the power-off 4 → 2 downshift shift duty control signal output from the TCU and supply and couple the second speed pressure supplied from the oil pump to the rear clutch R / C. Transmission control of automatic transmission. The apparatus of claim 1, wherein the vehicle driving detection unit comprises: a throttle valve opening degree detection unit configured to detect an opening degree of a throttle valve whose opening and closing state is variable in association with an operation state of an accelerator pedal, and output a corresponding signal; A vehicle speed detection unit configured to detect an output shaft rotation speed of the vehicle and output a corresponding signal corresponding to the traveling speed of the vehicle; A blown shaft rotation speed sensing unit configured to detect a rotation speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and output a corresponding signal; An engine rotation speed detection unit configured to detect a rotational speed of the crankshaft which is variable according to an operating state of the engine and output a corresponding signal; An accelerator pedal switch for varying and outputting an on / off signal of the switch according to an accelerator pedal operation state of a driver; A shift control apparatus for an automatic transmission comprising a shift lever detection unit for detecting a variable position according to a shift lever operation of a driver and outputting a corresponding signal. A shift control method of an automatic transmission, the method comprising: outputting a power-on 4? 2 downshift shift control signal stored in a memory when a shift lever is changed from a D range to a second range by a driver during four-speed driving; Determining a power state according to a driver's accelerator pedal operation during power-on 4? 2 downshift shifting; Determining whether the engagement duty is 100% output to the second actuator when the power state determined in the step is power off; If the power-off signal according to the accelerator pedal operation of the driver is output while the engagement duty of 100% is output to the second actuator in the above step, the engagement duty of 100% is output to the second actuator for a predetermined time t2. And outputting a power-off 4? 2 downshift shift control signal for lowering and outputting the engagement duty to 0% when the predetermined time t2 elapses. The method according to claim 3, wherein when the power-on 4 → 2 downshift shift control signal stored in the memory is output, the initial duty Dsr is output to the first actuator, and the duty value is output as Da2 when the power state is changed from power on to off. Making a step; Outputting a duty of 100% to the second actuator, and continuously outputting a duty of 100% for a predetermined time t2 when the power state is changed from power on to power off. The power-off 4? 2 downshift shift control signal is output from this time when the power state according to the accelerator pedal operation of the driver is changed from on to off while the engagement duty of 0% is output to the second actuator. Shift control method of an automatic transmission comprising a.

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