KR20030046629A - Apparatus for shift control on automatic transmission and method thereof - Google Patents

Abstract

PURPOSE: A shift control method of an automatic transmission and its method are provided to improve the shifting feeling by compensating hydraulic pressure after the shifting with making an engine torque into account. CONSTITUTION: In detecting a shifting demand, a shifting to a target gear is performed through a duty control(S102,S103). In finishing the shifting, a recover time of a set engine torque is counted and another shifting demand is checked during the counting(S104,S105,S106). In detecting the shifting demand during the counting, a passing time of the counter is calculated(S108). A shifting to a target gear is performed by calculating a compensating value of hydraulic pressure from the passing time of the counter(S110). Thereby, the generation of shifting shock is eliminated by minimizing the effect of a torque reduction control.

Description

Transmission control device and method of automatic transmission {APPARATUS FOR SHIFT CONTROL ON AUTOMATIC TRANSMISSION AND METHOD THEREOF}

The present invention relates to an automatic transmission, and more particularly, in the automatic transmission performing the total control, when the rear shift occurs in a state where the engine torque is not completely recovered after the completion of the previous shift, the hydraulic pressure of the rear shift is corrected and controlled. The present invention relates to a shift control apparatus and a method of an automatic transmission to improve a shift feeling.

Conventional automatic transmission using a total control that automatically shifts to the target shift stage through hydraulic control according to the driving speed, the opening ratio of the throttle valve linked to the driver's acceleration pedal drive, and the vehicle's various condition conditions. The control device controls the output of the hydraulic pressure set in the same manner as the shift control of the single downshift when the downshift shift occurs immediately after the preceding shift, that is, when the downshift shift occurs after the downshift shift or after the downshift shift occurs. It is configured to be.

For example, in the case of the 3-2 shift, the 3-2 shift immediately after the 4-3 shift or the 3-2 shift immediately after the 2-3 shift is the same to engage the 2nd speed, which is the target shift stage. Hydraulic control is set.

Therefore, in the case of the automatic transmission control device using the total control, the shift feeling and the durability are secured, but even if the electric signal for torque reduction is terminated immediately after the total control, the actual torque recovery of the engine takes some time.

Normal engine torque is restored after the passage of approximately 1 sec after shifting.

Therefore, if another shift occurs after the end of the shift to a certain shift stage and before the engine torque is normally restored completely, the shift control apparatus outputs a hydraulic pressure set to the target shift stage in the same manner as the speed shift control to perform the rear shift. As a result, there is a problem of generating a tie-up shock during the backward shift under the influence of the engine torque lowered by the preceding shift.

The tie-up shock magnitude is inversely proportional to the time until the engine torque recovers normally after the end of the preceding shift.

In other words, if the following shift occurs immediately after the completion of the preceding shift, a very large tie-up shock occurs. However, if the reverse shift occurs after sufficient time for the engine torque to fully recover after the preceding shift, the tie-up shift shock does not occur. Will not.

The present invention has been invented to solve the above problems, the object of which is to measure the time interval with the subsequent shift after the preceding shift in the automatic transmission using the total control and inversely proportional to the measured time By correcting and controlling the hydraulic pressure of the rear shift, the influence of the torque reduction control used at the previous shift is minimized to improve the shift feeling.

That is, in consideration of the engine torque recovered after the end of the previous shift, the shift feeling is improved by performing hydraulic pressure correction for the rear shift.

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

Figure 2 is a flow diagram of an embodiment for performing the hydraulic pressure correction control during the sequential shift in the automatic transmission according to the present invention.

3 is a torque relationship timing diagram between a preceding shift and a backward shift in an automatic transmission according to the present invention.

4 is a graph showing the relationship between the engine torque and the correction hydraulic pressure in the automatic transmission according to the present invention.

The present invention for realizing the above object comprises the steps of performing a shift to the target gear shift through the duty control when the shift request of the vehicle is detected; Counting the set engine torque recovery time when the shift to the target shift stage is completed, and determining whether a trailing shift request is detected while the counter is in progress; Calculating an elapsed time (T1) of the counter when a post-shifting request is detected while the counter is in progress; And calculating a hydraulic pressure correction value from the calculated counter elapsed time T1 to perform a shift of a target shift stage.

The hydraulic correction value calculated from the counter value in the above is characterized in that it is inversely proportional to the measurement time from the preceding shift to the backward shift.

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

As can be seen in FIG. 1, the shift control apparatus of the automatic transmission according to the present invention includes a throttle detector 10, a vehicle speed detector 20, an oil temperature detector 30, an engine speed detector 40, and a controller 50. And an actuator 60, the throttle detector 10 detects the opening degree of the throttle valve operated in conjunction with the accelerator pedal driven by the driver and outputs an electrical signal thereto.

The vehicle speed detector 20 includes a PG-B sensor and detects a current vehicle speed by detecting rotation speed of a transfer driven gear and outputs an electrical signal thereto.

The oil temperature detection unit 30 detects the temperature of the transmission oil for operating the engagement element and the friction element by driving the solenoid valve in accordance with the detection of the shift signal and outputs an electrical signal thereto.

The engine speed detector 40 detects the number of revolutions of the engine by counting the number of revolutions of the crankshaft, and then outputs an electrical signal thereto.

The controller 50 sets the target shift stage when the shift request of the upshift shift or the downshift is detected in the state of driving in synchronization with a certain shift stage, and then controls the oil pressure so that the shift to the target shift stage proceeds. For example, when the shifting request is detected after the shift to the target shift stage is completed, the shifting time is calculated. Perform step shifting.

The actuator 60 is driven according to the control signal applied from the controller 50 to drive the hydraulic pressure for the shift of the target shift stage.

In the configuration of the present invention including the function as described above, the operation of performing the hydraulic pressure correction when the following shift occurs before the engine torque is recovered after the preceding shift is as follows.

The controller 50 detects and analyzes the general information of the vehicle in the state of maintaining the driving at a predetermined speed by synchronizing an arbitrary shift stage and determines whether there is a shift request due to a change in the throttle opening degree (S101) (S102). .

When it is detected that there is a shift request, the controller 50 reads the current vehicle speed and the opening degree of the detected throttle valve from the set map table, sets the target speed change stage, and then sets the target speed change by duty control through the actuator 60. The shift to the step is performed (S103).

After the shift to the target shift stage is determined as described above, it is determined whether the shift is completed (S104). If it is determined that the shift is completed, the set time is counted until the reduced and controlled engine torque is recovered during the shift progress (S105). ).

As shown in FIG. 3, in the process of countering the engine torque recovery time as described above, it is detected whether a rear shift request occurs (S106). If a rear shift request is not detected, the engine torque recovery time is continuously returned to S105. When a new shift request is detected, it is determined whether or not the counter value of the engine torque recovery time is completed (S107).

When the counter of the engine torque recovery time is completed and the rear shift request is generated while the engine torque is normally restored, the shift to the target shift stage is performed by the normal duty control set for the shift stage (S111). If the engine torque is detected as a backward shift request in a state in which the normal speed is not normally restored, the elapsed time T1 until the trailing shift is generated from the counter value after completion of the preceding shift is calculated (S108).

Thereafter, the hydraulic correction value for shifting to the target shift stage is calculated based on the elapsed time T1 (S109), and the shift of the target shift stage is performed by duty control through the corrected hydraulic pressure (S110). ).

The calculation of the hydraulic pressure correction value in consideration of the elapsed time T1 from the completion of the preceding shift to the occurrence of the backward shift can be seen from the relationship between the recovery of the engine torque and the required hydraulic pressure after the torque reduction control shown in FIG. 4. Similarly, since it takes about 800 ms to recover the engine torque by 90% or more after the end of the shift, the time limit that actually requires correction hydraulic pressure is about 600 ms.

That is, if another shift occurs before the engine torque is completely recovered, the control hydraulic pressure P for the backward shift should be controlled at a pressure slightly lower than the hydraulic value tuned to the target shift stage in the normal torque state. It is determined from the relational expression of adding the correction hydraulic pressure to the reference duty hydraulic pressure as follows.

P = P (reference duty) + Pc (calibration hydraulic pressure)

Here, Pc is a value inversely proportional to the engine torque recovery time from the end of the shift to the time when the backward shift occurs.

As described above, the present invention calculates the hydraulic correction value according to the elapsed time from the previous shift to the time when the backward shift occurs after the shift is completed and before the torque recovery time has elapsed. By shifting, the influence of the torque reduction control used in the previous shift is minimized to eliminate the occurrence of tie-up shift shock, thereby improving the shifting feeling.

In addition, since the shifting speed of the sequential shifting is improved without changing the hardware of the automatic transmission, relative cost reduction is achieved, and the shifting speed of the sequential shifting is improved without using a one-way clutch (OWC), thereby providing a relatively light weight.

Claims (5)

Throttle detecting means for detecting an opening rate of a throttle valve which is varied in accordance with the driver's deceleration will; Vehicle speed detecting means for detecting information of a current traveling speed; Oil temperature detecting means for detecting a temperature of the transmission oil for driving the engagement element and the friction element; Engine speed detection means for detecting current engine speed information; Hydraulic pressure is controlled so that the shift to the target shift stage is progressed according to the shift demand, and when the trailing shift request is detected after the shift is completed, the hydraulic correction is inversely proportional to the elapsed time by counting the time at which the trailing shift request occurs after the preceding shift. Control means for controlling the shift of the target shift stage with respect to the following shift request; And a driving means driven according to a control signal applied from the control means to drive hydraulic pressure for shift synchronization. Performing a shift to a target shift stage through duty control when a shift request of the vehicle is detected; Counting the set engine torque recovery time when the shift to the target shift stage is completed, and determining whether a subsequent shift request is detected while the counter is in progress; Calculating an elapsed time (T1) of the counter when a post-shifting request is detected while the counter is in progress; And shifting a target shift stage by calculating a hydraulic pressure correction value from the calculated counter elapsed time (T1). The method of claim 2, The shift control method of the automatic transmission characterized in that the shift of the target shift stage is performed by the normal duty control when the following shift is detected after the counter of the engine torque recovery time is completed. The method of claim 2, And the hydraulic pressure correction value calculated from the counter value is inversely proportional to the measurement time. The method of claim 2, The hydraulic pressure P calculated for the following shift control is set to P (reference duty) + Pc (correction hydraulic pressure), where Pc (correction hydraulic pressure) is an engine torque recovery from the end of the shift to the time when the rear shift occurs. A shift control method of an automatic transmission, characterized in that the value is inversely proportional to time.