KR19980036574A - Shift control method of automatic transmission - Google Patents

Abstract

The present invention relates to a shift control method of an automatic transmission. When driving starts, it is determined whether the shift lever is in the D range, and when the shift lever is in the D range, it is determined whether the over-driver switch is operated. When the over-driver switch is turned on, in the duty control subroutine according to the D-range over-driver switch-on shift pattern stored in the memory map, when the driver releases the accelerator pedal during the 5-speed shift stage, In order to prevent a stop, a minimum 5-speed maintenance vehicle speed is set, and the shift stage is directly skipped to 3 speeds in consideration of the driver's willingness to shift, and when the over driver is switched off, Duty control subroutine by stored D range over driver switch-off shift pattern In this case, when the driver releases the accelerator pedal while the vehicle is shifting to the fourth speed, the shift speed is set to the four-speed maintenance minimum vehicle, and when the vehicle speed is lower than the four-speed maintenance minimum vehicle speed, By shifting down into the engine and setting the shift pattern in consideration of engine stop, body vibration, and noise, it is an automatic transmission and reflects the driver's intention so that the shift occurs as much as the shift lever selects. By additionally configuring a manual mode that prevents the RPM from entering the red zone, the automatic transmission can enjoy the same driving as the manual transmission, improves the merchandise of the vehicle, and has the effect of enabling sports driving.

Description

Shift control method of automatic transmission

The present invention relates to a shift control method of an automatic transmission, and more particularly, to shift a sport equipped with a shift lever by adding a manual mode in order to fully reflect a driver's intention such as a manual transmission. The present invention relates to a shift control method of an automatic transmission capable of traveling.

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 control device 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. The engine stall can be reduced due to the driver's malfunction or immaturity of the driver while driving, and thus the driving operation can be facilitated even for a beginner.

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

The action of the planetary gear arrangement is switched in accordance with the selective movement of the friction element, which consists of a clutch or brake, 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 which is geared with the subordinate gear by the driven gear geared to the drive gear and controls the rotational operation 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.

Therefore, in the conventional automatic transmission operating as described above, L range was mainly used at the start of the vehicle on the steep slope, and 2 range was selected and used when the propulsion force was required on the ramp during slow motion, and in the D range during normal driving. When high speed driving was required while driving from 2 to 4 speeds, the shift stage by operating the over driver switch was changed to 5 speed.

However, since the driver shifts the shift sequentially according to the opening amount of the throttle valve and the preset shift pattern caused by the vehicle speed, the shift lever is operated according to the driver's will at that time. There is a problem that can not be satisfied by the driver driving a vehicle equipped with an automatic transmission because it is not possible to shift by the selection.

Therefore, in order to solve the above-mentioned conventional problems, the automatic transmission and the driver's intention to reflect the driver's intention to make the shift as much as possible according to the selection of the shift lever, and to stop the engine or the engine RPM to enter the red zone. It is to provide a transmission control method of the automatic transmission having the effect that can enjoy the same driving as the manual transmission, improve the vehicle's merchandise, and have a sports driving effect by additionally configuring the manual mode to prevent.

According to an aspect of the present invention, there is provided a method including: determining whether a shift lever has a D range when driving starts; Determining whether the over-driver switch is activated when the shift lever is in the D range; When the driver is disengaged from the accelerator pedal during the five-speed shift stage in performing the duty control subroutine according to the D-range over-driver switch-on shift pattern stored in the memory map when the over-driver switch is turned on. Setting a five-speed maintenance minimum vehicle speed to prevent a stop of the engine; Performing a skip down shift directly to the third gear speed in consideration of the driver's willingness to shift; When the over driver is switched off, the driver takes his foot off the accelerator pedal during the four-speed shift of the vehicle in performing the duty control subroutine according to the D range over driver switch-off shift pattern stored in the memory map. Setting the speed change stage to a four-speed maintenance minimum vehicle speed; When the vehicle speed is lower than the four-speed maintenance minimum vehicle speed, the shift stage is downshifted to three speeds, and the shift pattern is set in consideration of engine stop, vehicle vibration, and noise.

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;

3A to 3E are shift pattern diagrams of an automatic transmission according to an exemplary 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. 1, a shift control apparatus of an automatic transmission according to an exemplary embodiment of the present invention is configured to detect a vehicle driving state that receives a signal that is variable and output according to a driving state of the vehicle and outputs the signal as a corresponding electric signal. Means (10); A control means (20) for receiving a signal output from the vehicle driving state detecting means (10) and outputting a duty control signal according to a shift pattern stored in a memory map of a corresponding shift range in accordance with a driver's shifting will; The driving means 30 receives the duty control signal output from the control means 20 and shifts the shift stage to the target shift stage in accordance with the shifting intention before operation.

In the above, the vehicle driving state detection means 10, the throttle valve opening degree detection unit 11 for detecting the degree of opening of the throttle valve whose opening and closing state is variable in conjunction with the operation state of the accelerator pedal and outputs a corresponding signal; A vehicle speed detector 12 which detects a driving speed of the vehicle and outputs a corresponding signal; A shift stage sensing unit 13 configured to detect a variable state of the shift stage and output 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; A turbine shaft rotational speed sensing unit 15 for sensing a rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and outputting a corresponding signal; When the shift lever is changed and selected by the driver's willingness to output a corresponding signal, the shift lever detection unit 16 detects the signal and outputs the corresponding electric signal.

Therefore, the control means 20 determines whether the position of the shift lever is the D range (S100).

When the shift lever is not in the D range, the control means 20 determines whether the shift lever is in the D3 range (S110).

However, in the case where the shift lever is in the D range, the control means 20 determines whether the over driver switch is turned on (S101).

In the above case, when the over driver switch is turned on, the control means 20 performs a duty control subroutine according to the D range over driver switch on shift pattern stored in the memory map as shown in FIG. In performance, set the 5-speed minimum vehicle speed as shown in the dotted line when the driver takes off the accelerator pedal during 5-speed driving, and directly skips down to the 3-speed to reflect the driver's willingness to shift. (Skip Down) Shifts, and shifts the power-up shift by the driver's accelerator pedal and puts hysteresis on the downshift to set the upshift shift as shown in the solid line to perform duty control and return to the initial stage. (S102).

However, when the over driver is switched off, the control means 20 is the duty control subroutine by the D range over driver switch off shift pattern stored in the memory map as shown in FIG. In performing the step, when the shift stage is changed from the 5th speed to the 4th speed, when the speed change stage becomes the 4th speed and the RPM of the engine turns into the red zone, the engine is dangerous, and the actual practice shown to prevent this is shown. Likewise, set the gearshift speed to the maximum allowable speed of 4 speeds (determining the maximum speed of the 4th speed by the maximum RPM of the engine) and set up shift line with hysteresis to prevent the driver from stepping on the accelerator pedal. When the gear shift stage is set to 4 speed minimum vehicle speed as shown in the dotted line, and if it is lower than this, downshift the gear shift speed to 3 speed. It sets the shift schedule in consideration of the vibration, noise, etc. (S103).

When the shift lever is not in the D3 range, the control means 20 determines whether the shift lever is in the 2 range (S120).

However, when the shift lever position is D3, the control means 20 performs the duty control subroutine according to the shift pattern stored in the memory map as shown in (c) of FIG. When the opening amount of the throttle valve is changed according to the acceleration will, the shift stage is upshifted to 4 speeds as shown in the solid line shown in consideration of the maximum RPM of the engine, and when the driver takes off the accelerator pedal while driving at 4 speeds. In order to prevent the RPM from entering the red zone, the speed change stage is set to 3 speeds as shown in the dotted line, and the shift pattern is set by hysteresis (S111).

That is, in the above shift pattern, the engine RPM increases when the shift lever is changed to the D3 range when the shift lever is in the D range over-driver switch operation on (shift speed 5 speed), so that the RPM of the engine does not enter the red zone. It is set by the set shift pattern.

If the shift lever is not in the second range, the control means 20 determines whether the shift lever is in the L range (S130).

When the shift lever is in the L range, the control means 20 performs the duty control subroutine according to the shift pattern stored in the memory map, as shown in FIG. When the opening amount of the throttle valve is variable according to the acceleration will, the shift stage is set to 2 speeds as shown in the solid line considering the maximum RPM of the engine. As shown in the dotted line, the shift pattern for setting the shift stage to 1 speed is set in consideration of hysteresis and RPM of the engine (S131).

In addition, in the L range where the shift stage is 1 speed, when the opening amount of the throttle valve is changed by the driver's acceleration will without changing the position of the shift lever, the RPM of the engine rapidly rises, so the RPM of the engine reaches the red zone. In the engine control means, no further shifting by the fuel cutoff control is performed.

However, if the position of the shift lever is not the L range in the above, the control means 20 returns to perform the corresponding shift control.

However, when the shift lever is positioned in two ranges, the control means 20 performs the duty control subroutine according to the shift pattern stored in the memory map as shown in FIG. When the opening amount of the throttle valve is variable according to the driver's acceleration will, the shift stage is set to 3 speeds as shown in the solid line considering the maximum RPM of the engine. As shown in the dotted line, the shift pattern for setting the shift stage to 2 speed is set in consideration of hysteresis and RPM of the engine (S121).

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, in the embodiment of the present invention, the automatic transmission and the driver's intention to reflect the driver's intention to make the shift as much as possible according to the selection of the shift lever, and add a manual mode to prevent the engine stop or the engine RPM enters the danger zone. It can be configured to enjoy the same driving as a manual transmission as well as an automatic transmission, improve the merchandise of the vehicle, and can provide a shift control method of the automatic transmission having an effect capable of sports driving.

Claims (8)

Determining whether the shift lever is in the D range when driving starts; Determining whether the over-driver switch is activated when the shift lever is in the D range; When the driver is disengaged from the accelerator pedal during the five-speed shift stage in performing the duty control subroutine according to the D-range over-driver switch-on shift pattern stored in the memory map when the over-driver switch is turned on. Setting a five-speed maintenance minimum vehicle speed to prevent a stop of the engine; Performing a skip down shift directly to the third gear speed in consideration of the driver's willingness to shift; A shift control method for an automatic transmission comprising a step of performing a duty control by setting an up shift shift by putting hysteresis on the down shift when shifting a power-on down shift by a driver's accelerator pedal operation. The method of claim 1, wherein when the over driver is switched off, when the shift stage is changed from five to four speeds in performing the duty control subroutine according to the D-range over-driver switch-off shift pattern stored in the memory map. In order to prevent this, the speed is set to 4 speed allowable maximum speed (determined to 4 speed maximum vehicle speed by the maximum RPM of the engine) and hysteresis is prevented. Setting up shift lines; Setting the speed change stage to the four-speed maintenance minimum vehicle speed when the driver takes his / her foot off the accelerator pedal while the vehicle travels in the fourth gear speed; The shift control method of the automatic transmission further comprises the step of setting the shift pattern in consideration of the engine stop, body vibration, noise, and the like by downshifting the shift stage to three speeds when the vehicle speed is lower than the minimum four-speed maintenance speed. The method of claim 1, further comprising: determining whether the shift lever is in the D3 range when the shift lever is not in the D range; When the shift lever position is D3, when performing the duty control subroutine according to the shift pattern stored in the memory map, considering the maximum RPM of the engine when the opening amount of the throttle valve is changed according to the driver's acceleration will. The shift stage is shifted up to 4 speeds, the shift speed is set to 3 speeds so that the engine RPM does not enter the red zone when the driver takes off the accelerator pedal while driving at 4 speeds, and the shift pattern is set by hysteresis. Shift control method of an automatic transmission comprising a. The engine is set so that the RPM of the engine does not enter the red zone because the RPM of the engine increases when the shift lever is changed to the D3 range while the shift lever is in the D range over driver switch operation state (5 speed stage). The shift control method of the automatic transmission further comprising the setting by the shift pattern. The method of claim 3, further comprising: determining whether the shift lever is in the second range when the shift lever is not in the D3 range; When the shift lever is positioned in two ranges, when performing the duty control subroutine according to the shift pattern stored in the memory map, the maximum RPM of the engine is changed when the opening amount of the throttle valve is varied according to the driver's acceleration will. The shift speed is set to 3 speeds, and the shift pattern is set to 2 speeds in consideration of hysteresis and the RPM of the engine when the pedal is released from the 3rd speed. Transmission control method of the transmission. The method of claim 5, further comprising: determining whether the shift lever is in the L range when the shift lever is not in the 2 range; When the shift lever is in the L range, the maximum RPM of the engine is increased when the opening amount of the throttle valve is varied according to the driver's acceleration in performing the duty control subroutine according to the shift pattern stored in the memory map. And setting the shift stage to the second speed in consideration of hysteresis and the RPM of the engine when the foot is released from the accelerator pedal during driving of the shift speed to the second speed. How to control the shifting of an automatic transmission. The shift control method according to claim 6, further comprising returning to perform the shift control when the shift lever is not in the L range. In the L range with the gear shift speed of 1 speed, when the opening amount of the throttle valve is changed by the driver's acceleration will without changing the position of the shift lever, the RPM of the engine rises so that the RPM of the engine reaches the red zone. A shift control method for an automatic transmission comprising a step of allowing upshift shifting only once and then not shifting by fuel cutoff control of the engine control means.