KR20130023547A - Fault detection diagnosis apparatus of rotational direction of auto transmission output shaft and method thereof - Google Patents

Fault detection diagnosis apparatus of rotational direction of auto transmission output shaft and method thereof Download PDF

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Publication number
KR20130023547A
KR20130023547A KR1020110086388A KR20110086388A KR20130023547A KR 20130023547 A KR20130023547 A KR 20130023547A KR 1020110086388 A KR1020110086388 A KR 1020110086388A KR 20110086388 A KR20110086388 A KR 20110086388A KR 20130023547 A KR20130023547 A KR 20130023547A
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KR
South Korea
Prior art keywords
output shaft
automatic transmission
speed
detected
reverse gear
Prior art date
Application number
KR1020110086388A
Other languages
Korean (ko)
Inventor
박정철
Original Assignee
주식회사 현대케피코
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Publication date
Application filed by 주식회사 현대케피코 filed Critical 주식회사 현대케피코
Priority to KR1020110086388A priority Critical patent/KR20130023547A/en
Publication of KR20130023547A publication Critical patent/KR20130023547A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/38—Inputs being a function of speed of gearing elements
    • F16H59/40—Output shaft speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/16—Inhibiting or initiating shift during unfavourable conditions, e.g. preventing forward reverse shift at high vehicle speed, preventing engine over speed
    • F16H2061/168—Forced shifts into neutral for safety reasons, e.g. in case of transmission failure or emergency braking

Abstract

Disclosed are an apparatus and a method for diagnosing an error in the direction of rotation of an automatic transmission output shaft. This apparatus and method is characterized in that the automatic transmission retracts through the output shaft rotational direction of the automatic transmission and the rotational speed detected by the sensor for sensing the output shaft rotational direction exceeds the reference speed and the output shaft rotational direction detected by the sensor. It is determined whether the state of the gear, and if the determination result is exceeding the reference speed and the reverse gear state, it is diagnosed that the rotation direction detected by the sensor is incorrectly detected. Accordingly, when the rotation direction detection is wrong, it is possible to prevent the rotation direction information from being used during the shift control, thereby preventing the wrong shift control in advance.

Description

Fault detection diagnosis apparatus of rotational direction of auto transmission output shaft and method

The present invention relates to a vehicle automatic transmission, and more particularly to a technique for detecting the output speed and the rotation direction of the output shaft of the automatic transmission.

One of the important variables for controlling the vehicle automatic transmission is the output speed of the automatic transmission, that is, the rotation speed of the output shaft. This rotation speed is a key factor in determining whether to shift and controlling the best shift. Therefore, if a failure occurs in the output shaft speed sensor of the automatic transmission, a problem occurs in the shift control, it is important to diagnose the failure of the speed sensor. To this end, the invention related to the output shaft speed sensor failure diagnosis method of a conventional vehicle automatic transmission is known through the Patent Publication No. 10-2003-0073392. This method performs an output shaft speed sensor failure determination control operation when the vehicle is driving forward, and if it is a failure, detects the turbine speed and the engine speed and compares the detected value with the respective set value to determine the output shaft speed sensor failure. The shift control operation set according to FIG. Accordingly, even if the output shaft speed sensor of the automatic transmission fails, it is possible to secure the stability of the vehicle.

Meanwhile, a speed sensor capable of detecting not only the rotational speed of the output shaft of the automatic transmission but also the rotational direction is applied to the output of the automatic transmission. Therefore, it is possible to determine whether the vehicle moves forward or backward along with the rotation speed of the automatic transmission output shaft, thereby enabling more optimal shift control. However, if the direction of rotation is incorrectly detected due to the poor performance of the direction sensor, the shift control may be completely shifted. In particular, if the vehicle is actually moving forward and judges backward, it may cause serious problems in shift control.

It is an object of the present invention to provide a technical solution capable of diagnosing a wrong detection of a rotation direction of an automatic transmission output shaft.

According to an aspect of the present invention, there is provided an automatic transmission output shaft rotational direction detection apparatus for detecting an automatic transmission output shaft rotational speed and an output shaft rotational direction, and the sensed output shaft rotational speed. Determines that the automatic transmission is in the reverse gear state by exceeding the reference speed and the detected output shaft rotation direction. If the determination result is greater than the reference speed and the reverse gear state, the detected rotation direction is incorrectly detected. And a control unit. Here, the reference speed is an automatic transmission output shaft rotational speed compared to the engine maximum rotational speed in the reverse gear state.

On the other hand, the automatic transmission output shaft rotation direction detection detection method according to an aspect of the present invention for achieving the above object is whether the output shaft rotational speed of the automatic transmission detected by the sensor exceeds the reference speed and by the sensor Determining whether the automatic transmission is in the reverse gear state based on the detected output shaft rotation direction of the automatic transmission; and if the determination result is greater than the reference speed and the reverse gear state, the detected rotation direction is incorrectly detected. It includes a step. Here, the reference speed is an automatic transmission output shaft rotational speed compared to the engine maximum rotational speed in the reverse gear state.

The automatic transmission output shaft rotational direction detection device and method according to the present invention can diagnose whether the output shaft rotational direction detection of the automatic transmission by the direction recognition speed sensor is correct or wrong. Accordingly, when the rotational direction detection is wrong, it is possible to prevent the rotational direction information from being used during the shift control, thereby preventing the wrong shifting control in advance.

1 is a block diagram of an automatic transmission output shaft rotational direction detection device according to an embodiment of the present invention.
Figure 2 is a flow diagram of the automatic transmission output shaft rotational direction detection detection method according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

1 is a block diagram of an automatic transmission output shaft rotational direction detection device according to an embodiment of the present invention.

As shown in the drawing, the automatic transmission output shaft rotational direction detection device includes a direction-recognition speed sensor 100 and a control unit 200. The direction recognition speed sensor 100 is a rotation speed sensor capable of detecting a direction and detects an output shaft rotation speed (output speed) and an output shaft rotation direction of the automatic transmission. For this purpose, the direction recognition speed sensor 100 is preferably installed at the output of the automatic transmission. The control unit 200 is a transmission control unit (TCU). The control unit 200 may collect information such as brake signal on / off, engine rotation speed, transmission output speed, and rotation direction. In one embodiment, the control unit 200 receives the brake signal on / off and engine rotation speed information from the engine control unit (Engine Control Unit) through the controller area network (CAN) communication, the direction recognition speed sensor 100 Receives the information about the rotation speed and direction of the output shaft from the automatic transmission.

Hereinafter, with reference to Figure 1 will be described an operation example of the automatic transmission output shaft rotation direction error detection diagnostic apparatus. The control unit 200 determines whether the rotation speed detected by the direction recognition speed sensor 100 exceeds the reference speed. Here, the reference speed means the rotation speed of the output shaft of the automatic transmission that can be derived from the maximum engine speed in the reverse gear ratio. Normally, the reverse gear ratio of the automatic transmission is similar to the value of the low stage (between the first and second stages). That is, the control unit 200 determines whether the sensed rotational speed exceeds the output shaft rotational speed of the automatic transmission which can come out at the maximum engine speed in the reverse gear ratio. In addition, the control unit 200 determines whether the automatic transmission is in the forward gear state or the reverse gear state through the rotation direction detected by the direction recognition speed sensor 100. In one embodiment, the control unit 200 determines that the direction of the current input from the direction recognition speed sensor 100 is in the forward gear state when the direction is positive (+), and is negative (-). If it is (reverse direction), it is determined that it is in reverse gear.

If it is determined that the rotation speed exceeds the reference speed and is in the reverse gear state, the control unit 200 diagnoses that the direction recognition speed sensor 100 incorrectly detects the rotation direction of the output shaft of the automatic transmission. Do not consider the direction of rotation. In other words, even if the driver puts the reverse gear in the highest speed, the speed of the vehicle should be below a certain speed. Therefore, it is impossible for a reverse to yield a value that is greater than the engine speed that can be achieved at the maximum engine speed. By applying such a physical situation, the control unit 200 is incorrectly sensed the rotation direction when the rotation speed is more than a certain speed in the situation determined to be backward through the rotation direction detected by the direction recognition speed sensor 100. It is reasonable to see.

2 is a flowchart illustrating a method for diagnosing false detection of an automatic transmission output shaft rotation direction according to an exemplary embodiment of the present invention.

First, the control unit 200 determines whether there is no electric error in the direction recognizing speed sensor 100 (S100). If there is no electric error in the direction recognition speed sensor 100, the control unit 200 determines whether there is no electric error in power supply to the direction recognition speed sensor 100 (S200). If it is determined that there is no electrical error in the power supply, the control unit 200 determines whether the battery voltage for the power supply is a predetermined value or more (S300). For example, a normal battery voltage should be at least 10V. If there is no problem with the battery voltage as a result of the determination, the control unit 200 determines whether there is no error in the brake signal and whether the brake is off (S400). If there is no error in the brake signal and the brake signal is off, the control unit 200 determines whether the engine rotational speed exceeds the engine rotational reference speed at which the vehicle does not have an error and whether there is no abnormality in CAN communication (S500). For example, the engine speed reference speed should be 400 rpm. If the engine rotation speed exceeds the engine rotation reference speed and there is no problem in CAN communication, the control unit 200 determines whether the output shaft rotation speed of the automatic transmission detected by the direction recognition speed sensor 100 exceeds the reference speed. (S600). Here, the reference speed means the rotation speed of the output shaft of the automatic transmission that can be maximized from the maximum engine speed in the reverse gear ratio. In one embodiment, the reference speed may be 3000 rpm.

When the output shaft rotation speed of the automatic transmission exceeds the reference speed, the control unit 200 determines whether it is in the forward gear state or the reverse gear state through the output shaft rotation direction of the automatic transmission detected by the direction recognition speed sensor 100. Determine (S700). In one embodiment, the control unit 200 is determined to be in the forward gear state when the direction of the current input from the direction recognition speed sensor 100 is positive, and if it is negative, it is the reverse gear state. I think that. If the direction of the current is negative, the control unit 200 diagnoses that the direction recognition speed sensor 100 has a problem in detecting the rotation direction, although the electrical failure does not occur, and the direction recognition speed sensor 100 during the shift control. Ignoring the rotation direction information detected by (S800). And if the amount of current direction, the control unit 200 diagnoses that the direction recognition speed sensor 100 is normal, and performs the shift control in consideration of the rotation direction information in addition to the rotation speed information during the shift control as in the conventional ( S900). That is, the control unit 200 first checks whether there is an electrical failure, and if there is no electrical failure, secondly physically verifies the rotation direction detection result of the direction recognition speed sensor 100 using the physical characteristics of the vehicle state. In addition, as soon as it is determined that the rotational direction detection is wrong, the use of the rotational direction information for shift control is stopped.

So far I looked at the center of the preferred embodiment for the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

100: direction recognition speed sensor 200: control unit

Claims (4)

A sensor for sensing an output shaft rotational speed and an output shaft rotational direction; And
And if the detected output shaft rotation speed exceeds the reference speed and the detected output shaft rotation direction determines whether the automatic transmission is in the reverse gear state, and if the determination result is greater than the reference speed and the reverse gear state, the detected rotation. A control unit for diagnosing that the direction is misdetected;
Automatic transmission output shaft rotational direction detection detection device comprising a. The method of claim 1,
And said reference speed is an automatic transmission output shaft rotational speed misalignment detection apparatus, wherein the automatic transmission output shaft rotational speed is compared with an engine maximum rotational speed in the reverse gear state. Determining whether the automatic transmission is in the reverse gear state based on whether the output shaft rotation speed of the automatic transmission sensed by the sensor exceeds a reference speed and the output shaft rotation direction of the automatic transmission sensed by the sensor; And
Diagnosing the detected rotation direction as being incorrectly sensed when the determination result is greater than the reference speed and the reverse gear state;
Automatic transmission output shaft rotational direction detection detection method comprising a. The method of claim 3,
And the reference speed is an output shaft rotational speed of the automatic transmission compared to an engine maximum rotational speed in the reverse gear state.
KR1020110086388A 2011-08-29 2011-08-29 Fault detection diagnosis apparatus of rotational direction of auto transmission output shaft and method thereof KR20130023547A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110086388A KR20130023547A (en) 2011-08-29 2011-08-29 Fault detection diagnosis apparatus of rotational direction of auto transmission output shaft and method thereof

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Application Number Priority Date Filing Date Title
KR1020110086388A KR20130023547A (en) 2011-08-29 2011-08-29 Fault detection diagnosis apparatus of rotational direction of auto transmission output shaft and method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108119646A (en) * 2016-11-28 2018-06-05 上海汽车集团股份有限公司 The method for diagnosing faults and device of vehicle speed probe
CN110806315A (en) * 2019-11-20 2020-02-18 北京工业大学 Gearbox composite fault diagnosis method based on inversion editing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108119646A (en) * 2016-11-28 2018-06-05 上海汽车集团股份有限公司 The method for diagnosing faults and device of vehicle speed probe
CN110806315A (en) * 2019-11-20 2020-02-18 北京工业大学 Gearbox composite fault diagnosis method based on inversion editing
CN110806315B (en) * 2019-11-20 2021-04-16 北京工业大学 Gearbox composite fault diagnosis method based on inversion editing

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