KR20160067454A

KR20160067454A - Method and system of contorlling shift for vehicle

Info

Publication number: KR20160067454A
Application number: KR1020140172871A
Authority: KR
Inventors: 정동훈; 양종태
Original assignee: 현대자동차주식회사
Priority date: 2014-12-04
Filing date: 2014-12-04
Publication date: 2016-06-14

Abstract

The present invention relates to a method and an apparatus for controlling a gear shift for a vehicle which use acceleration of a vehicle to predict a vehicle speed after starting a gear shift, and use the vehicle speed as an input of a gear shift map to consistently control a time point at which an engine RPM changes. According to an embodiment of the present invention, the method for controlling a gear shift for a vehicle comprises: a step of detecting data for performing gear shift control; a step of determining whether time until a time point at which a transmission input shaft RPM changes after starting a gear shift can be provided as a gear shift map based on the detected data; a step of predicting a vehicle speed or a transmission output shaft rotation count after the time point at which the transmission input shaft RPM changes if the time can be provided as the gear shift map; a step of calculating a target gear end using the predicted vehicle speed or transmission output shaft rotation count; and a step of controlling a gear shift according to the calculated target gear end.

Description

TECHNICAL FIELD [0001] The present invention relates to a shift control system for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vehicle speed change control method and apparatus, and more particularly to a vehicular speed change control method and apparatus, To a shift control method and apparatus.

Customer satisfaction with regard to the driving performance of a vehicle depends on how much the vehicle travels in accordance with the customer's tendency. However, since the performance characteristic of the vehicle is determined as one performance characteristic for the same vehicle type, there may be a difference between the driving behavior of the customer and the response of the vehicle. Accordingly, the customer often complains about the driving performance of the vehicle. That is, it is possible to maximize the satisfaction of the customer regarding the driving performance by grasping the driving behavior of the customer and controlling the shift so that the vehicle responds to the driving propensity of the customer.

On the other hand, in evaluating the running performance of the vehicle, the shift time occupies a very large portion. The step-variable transmission changes the engine operating point by shifting the gear ratio according to the shift map (gear range change map) for the purpose of improving fuel economy and driving performance. Most shifts occur during vehicle speed change, but merely a shift line referencing the vehicle speed causes a change in shift point of the driver depending on the vehicle speed change rate difference.

The shifting proceeds to three steps of judging whether or not the shifting is started by the shifting diagram, preparing the shifting via the clutch, and changing the RPM of the engine according to the clutch operation. Particularly, when the upper shift occurring when the accelerator pedal is depressed (the gear ratio is lowered to lower the engine RPM) is repeated under various conditions, the shift timing of the other engine RPM changes in the clutch operation, have. Accordingly, there is a need to control the constant shifting point of time which the driver can feel to be constant.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a vehicle speed control system, And to provide a vehicle speed change control method and apparatus.

According to an aspect of the present invention, there is provided a vehicular shift control method including: detecting data for performing a shift control; Determining, based on the detected data, whether a time from a start of the shift to a time point at which the transmission input shaft RPM changes can be provided as a shift map; Predicting a vehicle speed or a transmission output shaft speed after a time point at which the transmission input shaft RPM changes, if the time can be provided by the shift line; Calculating a target gear stage based on the predicted vehicle speed or transmission output shaft revolution speed; And controlling the shift according to the calculated target gear position.

If the time is not available as a shift map, the method may further comprise calculating a target gear in real-time vehicle speed.

The step of predicting the vehicle speed or the transmission output shaft speed after the time point at which the transmission input shaft RPM changes is performed based on the vehicle acceleration and the transmission output shaft change rate based on the rate of change of the transmission output shaft .

The data may include information relating to at least one of a position value of the accelerator pedal, a speed of the vehicle, an acceleration, a speed change stage, a transmission input shaft RPM, and a transmission output shaft RPM.

According to another aspect of the present invention, there is provided a vehicular shift control device including: a data detector for detecting data for a shift control; And the time from when the transmission input shaft RPM changes, to the time when the transmission input shaft RPM changes, based on the detected data, And a controller for controlling the shift according to the calculated target gear stage.

The shift control may include a change of a shift pattern, a sense of tightening to a target speed change stage, a change of an engine torque map, and a change of an engine torque filter.

The controller can calculate the target gear stage in the real-time vehicle speed when the time from the start of the shift to the point of time when the transmission input shaft RPM changes can not be provided by the shift map.

The controller calculates an increase amount during a time from the start of the shift to the time when the transmission input shaft RPM is changed based on the acceleration of the vehicle and the transmission output shaft change rate to calculate the vehicle speed or the transmission output shaft speed after the time point at which the transmission input shaft RPM changes Can be predicted.

As described above, according to the embodiment of the present invention, the shifting point of time can be varied, and the change point of the engine RPM felt by the driver at the shifting time point can be consistently maintained even if the vehicle acceleration is varied.

In addition, when the shift map is set so that the engine RPM is lowered to reach the maximum engine RPM on a flat ground basis, it is possible to prevent the engine oververaging phenomenon exceeding the maximum engine RPM in the downhill area compared to the flat area. .

1 is a block diagram schematically showing a vehicular transmission according to an embodiment of the present invention.
2 is a flowchart showing a vehicle shift control method according to an embodiment of the present invention.
3 is a graph showing changes in the transmission input shaft RPM according to time in the vehicular transmission control method according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Parts of the methods herein may be executed by at least one controller. The term controller refers to a hardware device comprising a memory and a processor adapted to perform one or more steps that can be interpreted in an algorithmic fashion. The memory is adapted to store algorithmic steps and the processor is adapted to perform the algorithmic steps in particular to perform one or more methods described in more detail below.

Further, control logic in accordance with embodiments of the present invention may be embodied as non-volatile computer readable media on a computer readable medium including executable program instructions that are executed by a processor, controller, or the like have. Examples of computer readable media include, but are not limited to, ROM, RAM, compact disk (CD) -ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage devices. The computer-readable medium may be distributed over a network connected to the computer system, for example, a computer-readable medium in a distributed manner by a telematics server or a controller area network (CAN) have.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms as used herein encompass a plurality of forms, unless the context clearly dictates otherwise. It will be understood that terms such as " comprises "and / or" comprising "or the like, when used in this specification, indicate that there are presently disclosed features, integers, steps, operations, elements and / Elements, steps, elements, components, and / or groups thereof are not intended to be exclusive or inclusive. As used herein, the term "and / or" includes any and all combinations of one or more of the items mentioned in the list.

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

1 is a block diagram schematically showing a vehicular transmission according to an embodiment of the present invention.

1, the vehicular transmission according to the embodiment of the present invention includes a data detector 10, a controller 20, and a transmission 30.

The data detector 10 detects data for the shift control, and the data detected by the data detector 10 is transmitted to the controller 20. The data detector 10 includes an accelerator pedal position sensor 11, a speed change stage sensor 12, a vehicle speed sensor 13, a transmission input speed sensor 14, a transmission output speed sensor 15 and an acceleration sensor 16, .

An accelerator position sensor (APS) 11 detects the degree to which the driver depresses the accelerator pedal. When the accelerator pedal is fully depressed, the position value of the accelerator pedal is 100%, and when the accelerator pedal is not depressed, the position of the accelerator pedal may be 0%.

The accelerator pedal position sensor 11 may use a throttle position sensor (TPS) mounted in the intake passage instead of APS. Accordingly, in the present specification and claims, it should be understood that the accelerator pedal position sensor 11 includes a throttle valve opening sensor, and the position value of the accelerator pedal includes the opening degree of the throttle valve.

The speed change stage sensor 12 detects the currently engaged speed change stage.

The vehicle speed sensor 13 measures the speed of the vehicle and is mounted on the wheel of the vehicle.

On the other hand, based on the signal of the accelerator pedal position sensor 11 and the signal of the vehicle speed sensor 13, the target speed change stage can be calculated using the speed change pattern, and the shift to the target speed change stage is controlled. That is, in the case of an automatic transmission having a plurality of planetary gear sets and a plurality of friction elements, the hydraulic pressure supplied to or released from the plurality of friction elements is regulated. Further, in the case of the dual clutch transmission, the currents applied to the plurality of synchronizer mechanisms and the actuators are controlled.

The transmission input speed sensor 14 detects the input shaft RPM of the transmission.

The transmission output speed sensor 15 detects the output shaft RPM of the transmission.

The acceleration sensor 16 detects the acceleration of the vehicle. The acceleration sensor 16 may be mounted separately from the vehicle speed sensor 13 to directly detect the acceleration of the vehicle or calculate the acceleration of the vehicle by differentiating the vehicle speed detected by the vehicle speed sensor 13. [

The controller 20 may determine the vehicle speed after the time point at which the transmission input shaft RPM changes, or the vehicle speed after the time when the transmission input shaft RPM changes, if the time from the start of the shift based on the data detected by the data detector 10 to the time when the transmission input shaft RPM changes, Calculates a target gear position by predicting the transmission output shaft revolution number, and controls the shift according to the calculated target gear position. At this time, the controller 20 calculates an increase amount for a time period from the start of the shift to the time when the transmission input shaft RPM changes, based on the vehicle acceleration and the transmission output shaft change rate, The transmission output shaft speed can be predicted.

On the other hand, when the time from the start of the shift to the point of time when the transmission input shaft RPM is changed can not be provided by the shift map, the controller 20 calculates the target gear position in real time vehicle speed to control the shift.

For this purpose, the controller 20 may be implemented with one or more processors operated by a set program, and the set program may be one programmed to perform each step of the shift control method according to an embodiment of the present invention have.

The various embodiments described herein may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

According to a hardware implementation, the embodiments described herein may be implemented as application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays May be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and electrical units for performing other functions.

According to a software implementation, embodiments such as the procedures and functions described herein may be implemented with separate software modules. Each of the software modules may perform one or more of the functions and operations described herein. Software code can be implemented in a software application written in a suitable programming language.

Hereinafter, a vehicle shift control method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart of a vehicle shift control method according to an embodiment of the present invention.

The vehicle shift control method according to the embodiment of the present invention starts by detecting data of the vehicle for shift control (SlOO).

When the data detector 10 detects the data for the shift control, the controller 20 determines based on the detected data whether or not the time from the start of the shift to the time point at which the transmission input shaft RPM changes can be provided by the shift map S110).

The time to the point of time when the transmission input shaft RPM changes after the start of the shift is shown in Fig.

3 is a graph showing changes in the transmission input shaft RPM according to time in the vehicular transmission control method according to the embodiment of the present invention.

As shown in FIG. 3, the transmission input shaft RPM gradually increases according to the vehicle acceleration until the target gear stage is determined and the shift is started. The transmission input shaft RPM which is increased after a predetermined time is drastically reduced for shifting. This time is the time when the transmission input shaft RPM changes and the time T from the start of the shift to the time when the transmission input shaft RPM changes, .

The time T up to the time point at which the transmission input shaft RPM changes after the start of the shift can be controlled through the clutch hydraulic pressure control and learning so as to be constant with respect to all the shifts.

The controller 20 predicts the vehicle speed or the transmission output shaft speed after the point at which the transmission input shaft RPM changes, if the time from the start of the shifting to the point of time when the transmission input shaft RPM changes is provided as a shift map S120).

At this time, the controller 20 calculates an increase amount during the time from the start of the shift to the time point when the transmission input shaft RPM changes, based on the acceleration of the vehicle and the transmission output shaft change rate, The output shaft revolution number can be predicted.

If the vehicle speed or the transmission output shaft speed after the time point at which the transmission input shaft RPM changes is predicted in step S120, the controller 20 calculates the target gear speed with the predicted vehicle speed or transmission output shaft RPM (S130).

When the target gear stage is calculated using the predicted vehicle speed or transmission output shaft RPM, the engine RPM at the point of time when the input shaft RPM changes, regardless of the change amount of the transmission input shaft RPM during the time until the transmission input shaft RPM changes, Can be kept constant.

Alternatively, if the time from the start of the shift to the time point when the transmission input shaft RPM is changed can not be provided in the shift map, the controller 20 calculates the target gear in the real-time vehicle speed (S140).

When the target gear stage is calculated in step S130 or step S140, the controller 20 controls the shift according to the calculated target gear stage (S160).

As described above, according to the embodiment of the present invention, the change point of time can be varied, and the change point of the engine RPM felt by the driver at the shift time can be consistently maintained even if the vehicle acceleration is varied.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

Claims

Detecting data for performing shift control;
Determining, based on the detected data, whether a time from a start of the shift to a time point at which the transmission input shaft RPM changes can be provided as a shift map;
Predicting a vehicle speed or a transmission output shaft speed after a time point at which the transmission input shaft RPM changes, if the time can be provided by the shift line;
Calculating a target gear stage based on the predicted vehicle speed or transmission output shaft revolution speed; And
Controlling the shifting according to the calculated target gear stage;
And the vehicle speed control method.

The method according to claim 1,
If the time is not available in the variable speed line,
And computing a target gear position in real-time vehicle speed.

The method according to claim 1,
The step of predicting a vehicle speed or a transmission output shaft speed after a time point at which the transmission input shaft RPM changes,
Based on the acceleration of the vehicle and the rate of change of the transmission output shaft, the amount of increase during the time from the start of the shift to the point of time when the transmission input shaft RPM changes.

The method according to claim 1,
Wherein the data includes information relating to at least one of a position value of the accelerator pedal, a speed of the vehicle, an acceleration, a speed change stage, a transmission input shaft RPM, and a transmission output shaft RPM.

A data detector for detecting data for shift control; And
If the time from when the transmission input shaft RPM changes to the time point when the transmission input shaft RPM changes can be provided by the shift map based on the detected data, the vehicle speed or the transmission output shaft rotation speed after the point at which the transmission input shaft RPM changes, And controls the shift according to the calculated target gear stage:
And the vehicle speed change control device.

6. The method of claim 5,
Wherein the shift control includes a change of a shift pattern, a sense of engagement to a target speed change stage, a change of an engine torque map, and a change of an engine torque filter.

6. The method of claim 5,
Wherein the controller calculates the target gear position in real time vehicle speed when the time from the start of the shift to the point of time when the transmission input shaft RPM changes is not available in the shift map.

6. The method of claim 5,
The controller calculates an increase amount during a time from the start of the shift to the time when the transmission input shaft RPM is changed based on the acceleration of the vehicle and the transmission output shaft change rate to determine the vehicle speed or the transmission output shaft speed after the point at which the transmission input shaft RPM changes And estimates the vehicle speed.

6. The method of claim 5,
Wherein the data includes information related to at least one of a position value of the accelerator pedal, a speed of the vehicle, an acceleration, a speed change stage, a transmission input shaft RPM, and a transmission output shaft RPM.