KR20180114292A - Shifting control method for vehicles - Google Patents

Abstract

The present invention relates to a technique for improving credibility of a failure diagnosis result by adding a failure diagnosis logic in accordance with a gear fastening failure. The present invention discloses a shifting control method for vehicles, comprising: a step of retrying gear fastening if gear fastening of a target transmission range for gear shifting is failed; a step of generating and integrating error counts if the gear fastening is failed in the gear fastening retrial step; and a step of controlling to drive by fastening one transmission range gear among transmission range gears excluding the gear of the target transmission range if the error count is less than a reference value.

Description

[0001] SHIFTING CONTROL METHOD FOR VEHICLES [0002]

The present invention relates to a shift control method for a vehicle, which improves the reliability of a fault diagnosis result by adding fault diagnosis logic according to a gear engagement failure.

Recently, there have been many developments of an automatic manual transmission (DCT, AMT) capable of simultaneously achieving the driving convenience of the automatic transmission, the fuel economy of the manual transmission, and the high power efficiency.

BACKGROUND ART [0002] An automatic manual transmission is a system that automatically performs clutch operation and gear shifting based on a manual transmission, and this operation is performed using a hydraulic or motor-driven actuator.

Particularly, in order to accurately shift the gear, a position sensor is required to measure the position of the shift finger in the shift direction for engaging / disengaging the gear. However, the position sensor increases the cost of the product, These disadvantages must be overcome because they are not applied to the motor actuator type.

Since the shift finger does not have a position sensor, the position of the speed change finger is determined using a rotor position sensor (Hall IC sensor) mounted on the motor for position / speed control of the BLDC motor, .

However, when an invalid signal is input to the Hall IC due to a contact failure or the like of the connector / wiring, the position error accumulation of the shift finger occurs, and the accumulation of the position error causes a problem .

Accordingly, if the Hall IC sensor is judged to be faulty when an invalid signal is input, the intermittent noise signal can be diagnosed frequently due to the Hall IC failure.

Particularly, the gear box of the manual transmission has a phenomenon in which the gear intermittently does not enter due to the braking during the gear engagement or the inferior perturbation during the cold. If such a phenomenon occurs, It is possible to cause excessive maintenance while judging the function abnormality as an actual failure.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-1628533 B

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a shift control method for a vehicle which increases the reliability of a fault diagnosis result by adding fault diagnosis logic according to a faulty gear engagement.

According to another aspect of the present invention, there is provided a gear shifting apparatus comprising: a gear engagement retrying step of retrying the gear engagement when a control unit fails to engage a gear at a target speed change stage for gear shifting; An error count integrating step of causing the control unit to generate an error count and to integrate the error count when the gear engagement fails due to the attempted gear tightening attempt; And a fail safe step of, when the error count is less than the reference value, controlling the one of the gears of the other gear step excluding the gear of the target gear step to be engaged and running .

In the attempted gear tightening attempt, the gear tightening retry can be performed a predetermined number of times.

In the fail-safe step, an upper or lower shift stage gear of the target shift stage where the gear engagement fails can be engaged.

A gear engagement request determination step of determining whether there is a request for engaging a target speed change gear that has failed in gear engagement after the fail safe step; And a gear engagement attempting step of attempting to engage the target speed change gear in which the gear engagement fails when the gear engagement request is made.

And diagnosing the control unit as a failure due to a failure in engagement of the speed change gear corresponding to the target speed change stage after the error count integration step, when the integrated error count is equal to or greater than the reference value.

And an error count reset step of resetting the accumulated error count when the gear engagement is attempted due to the gear engagement attempt after the gear engagement attempting step.

The present invention has the effect of improving the reliability of the diagnosis result by adding reliable diagnostic logic for diagnosis of the failure of the gear box. The present invention has the effect of suppressing frequent diagnosis of the gear box, Thereby improving the commerciality of the vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically shows the overall configuration of a hybrid DCT vehicle applicable to the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the case of the present invention, it may be applied to a hybrid vehicle equipped with a DCT transmission as shown in FIG.

Referring to the drawings, the coupling-side clutch and the releasing-side clutch are denoted by reference numerals CL1 and CL2, respectively, of the two clutches constituting the DCT, and the coupling-side clutch actuator and the releasing-side clutch actuator for engaging and disengaging them are CLA1 , CLA2, and the coupling-side input shaft and the release-side input shaft are indicated by reference numerals of INPUT1 and INPUT2, respectively.

The odd numbered gear actuator and the even numbered gear actuator for engaging and disengaging the respective speed change gears are denoted by GA1 and GA2, respectively.

However, this is only for convenience of understanding of the present invention, and the coupling side and the releasing side may be changed depending on the clutch which forms the current speed change stage and the clutch for forming the target speed change stage.

On the other hand, the vehicular transmission control method of the present invention can largely be configured to include a gear engagement retry phase, an error count integration phase, and a fail-safe phase.

1 and 2, the present invention will be described in detail. First, in the attempt of the gear engagement, the control unit C starts the gear engagement of the target speed change stage for shifting of the gear, , The gear engagement can be retried.

For example, when the first gear is fastened in order to shift to the first speed, if the first-gear first engaging operation fails, then the first gear is retried again.

At this time, the number of retry attempts of the gear engagement can be set to at least one reference number, so that the gear engagement retry can be performed within the reference number of times.

In the error count integration step, when the control unit C fails to engage the gear due to the gear retry attempt, it can generate an error count and accumulate the error count.

For example, the error count may be cumulatively accumulated in the control unit C, and if the gear engagement fails even with a gear retry attempt, one error count may be accumulated and stored.

In the fail safe step, when the error count is less than the reference value, the control unit C can control to engage and drive one of the gears of the other gear positions excluding the gear of the target gear position.

According to the above configuration, when the gear engagement fails even after the initial gear engagement and the gear engagement retrial, the error count is accumulated and it is determined whether the error count satisfies the set value.

As a result of the determination, if the accumulated error count does not reach the set value, the cause of the gear failure failure may be a state in which the gear is not temporarily fastened due to boking or perturbation failure. So that the vehicle can be driven to run by engaging another speed change gear capable of running at present.

Therefore, reliable diagnosis logic for fault diagnosis of the gearbox is added to improve the reliability of the diagnosis result, thereby restricting frequent diagnosis of the gearbox, restricting excessive maintenance, and improving the commerciality of the vehicle.

In addition, in the fail-safe step of the present invention, it is possible to fasten the gear stage gear of the upper or lower stage of the target gear stage where the gear engagement failed.

That is, when the target speed change stage in which the gear engagement fails is one stage, the second stage gear, which is the one-stage upper speed change stage, can be engaged.

For example, when the first gear fails to be engaged when the vehicle is started, the vehicle oscillates in two stages. In particular, in the case of a hybrid vehicle, the vehicle departs from the EV mode in which the drive motor alone drives the vehicle. So that the difference in the driving performance does not largely occur.

A gear engagement request determination step of determining whether there is a request for engagement of a target speed change gear that has failed in gear engagement after the failsafe step; And a gear engagement attempting step of attempting engagement of the speed change gear.

That is, when a situation occurs in which the first gear is not engaged and the first gear is engaged again as in the case before the stop of the vehicle while the vehicle is traveling at the remaining gear range (for example, 2/3/4/5/6 gear) , Try to tighten the first gear again. On the other hand, when there is no request for engagement of the first gear, the remaining gear range can be driven.

On the other hand, the present invention is characterized in that after the error count integration step, when the integrated error count is equal to or greater than the reference value, the control section (C) diagnoses a failure due to the engagement failure of the speed change gear corresponding to the target speed change stage The method further comprising the steps of:

That is, if the accumulated error count even after the gear tightening failure after the gear tightening retry is satisfied, the cause of the gear tightening failure is closer to the failure situation due to the poor gear tightening rather than the temporary cause due to boking or perturbation failure , And it is diagnosed as a failure situation of the gear box.

Accordingly, the reliability of the diagnostic result of the gearbox is improved, and the commerciality of the vehicle is improved.

In addition, the present invention may be configured to include an error count resetting step of resetting the accumulated error count at the gear engagement success due to the gear engagement attempt after the gear engagement attempt.

In this case, the error count stored in the controller C is set to the initial state to be 0, and the vehicle can be normally driven.

Hereinafter, a control flow of the vehicular transmission according to the present invention will be described.

Referring to Fig. 2, when the target speed change stage of the transmission gears in the gear box of the vehicle is one-stage, the first gear engagement is started (S10).

Then, it is determined whether or not the first stage gear engagement has failed (S20). If it is determined that the initial gear engagement fails, the first stage gear engagement is retried (S30).

In step S40, it is determined whether gear engagement has failed in step S30. If the gear engagement fails, one error count is added and the error count is accumulated in step S50.

Then, the accumulated error count value is compared with a reference value (S60). If the comparison result is less than the reference value, control is performed so that the vehicle travels by engaging one of the remaining speed change gears except for the first gear in accordance with the running state (S70).

After step S70, it is determined whether gear engagement of the first gear is required again according to the running state of the vehicle (S80). If it is determined that the gear engagement of the first gear is required as a result of the determination, On the other hand, if it is not required to engage the first gear, control is performed so that the vehicle travels while shifting the other gear except for the first gear (S60).

On the other hand, if it is determined in step S60 that the accumulated error count value is equal to or greater than the reference value, it is diagnosed as a failure condition corresponding to the first gear failure, in step S90, and the driver can be warned.

If it is determined that the gear engagement is successful, the error count value is reset to zero (S100) and the vehicle is normally driven so that the failure state due to the gear engagement failure is not certain.

As described above, the present invention improves the reliability of the diagnosis results by adding reliable diagnosis logic for fault diagnosis of the gearbox, thereby restricting frequent diagnosis of the gear box to limit excessive maintenance, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the specific embodiments set forth herein; rather, .

Claims (6)

A gear engagement retrying step of retrying the gear engagement when the control unit fails to engage the gear of the target speed change stage for shifting of the gear;
An error count integrating step of causing the control unit to generate an error count and to integrate the error count when the gear engagement fails due to the attempted gear tightening attempt; And
And a fail safe step of controlling the control unit to engage and shift one of the gears of the remaining gear steps excluding the gear of the target gear stage when the error count is less than the reference value. The method according to claim 1,
And the gear engagement retry is performed by a reference number of times in the gear engagement attempting step. The method of claim 2,
In the fail-safe step,
And engages the upper or lower shift stage gear of the target shift stage where the gear engagement failed. The method of claim 3,
After the fail-safe step,
A gear engagement request determination step of determining whether there is a request for engagement of the target speed change stage gear in which the gear engagement has failed;
And attempting to engage the target speed change gear that has failed in the gear engagement when the gear engagement is requested. The method according to claim 1,
After the error count integration step,
And diagnosing the control unit as a failure due to a failure in engagement of the speed change gear corresponding to the target speed change stage when the accumulated error count is equal to or greater than a reference value. The method according to claim 1,
After the gear tightening attempt,
And an error count resetting step of resetting the accumulated error count when the gear engagement is successful in accordance with the attempted gear engagement.

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