KR101771823B1 - Failure Detecting System and Method of an Automatic Transmission - Google Patents

Failure Detecting System and Method of an Automatic Transmission Download PDF

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Publication number
KR101771823B1
KR101771823B1 KR1020150188650A KR20150188650A KR101771823B1 KR 101771823 B1 KR101771823 B1 KR 101771823B1 KR 1020150188650 A KR1020150188650 A KR 1020150188650A KR 20150188650 A KR20150188650 A KR 20150188650A KR 101771823 B1 KR101771823 B1 KR 101771823B1
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South Korea
Prior art keywords
automatic transmission
speed
speed sensor
output shaft
input shaft
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KR1020150188650A
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Korean (ko)
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KR20170078287A (en
Inventor
남창우
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주식회사 현대케피코
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Priority to KR1020150188650A priority Critical patent/KR101771823B1/en
Publication of KR20170078287A publication Critical patent/KR20170078287A/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
    • 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
    • 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
    • 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
    • F16H59/42—Input 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
    • F16H61/02—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 characterised by the signals used
    • F16H61/0202—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 characterised by the signals used the signals being electric
    • F16H61/0204—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • 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
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The present invention relates to a fault detection system and method for an automatic transmission capable of distinguishing a gear ratio failure from a transmission input shaft speed sensor failure when a problem does not occur in an automatic transmission output shaft signal. A fault detection system for an automatic transmission according to an embodiment of the present invention includes an automatic transmission and a gear wheel connected to the automatic transmission; A first speed sensor for detecting a speed of an input shaft of the automatic transmission and outputting a first detection signal; A second speed sensor for detecting a speed of an output shaft of the automatic transmission and outputting a second detection signal; A third speed sensor for detecting a speed of the gear wheel and outputting a third detection signal, and a second speed sensor for detecting a gear ratio failure of the automatic transmission based on the first detection signal, the second detection signal, A speed sensor, an electronic control unit (ECU) for distinguishing faults of the second speed sensor and the third speed sensor.

Description

Technical Field [0001] The present invention relates to a failure detection system and method for an automatic transmission,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission of a vehicle, and more particularly, to a failure detection system and method of an automatic transmission that can distinguish between a gear ratio failure and a transmission input shaft speed sensor failure when a problem does not occur in an automatic transmission output shaft signal.

Generally, an automatic transmission is a device that automatically changes the vehicle speed by grasping the driver's will and the state of the vehicle. When the state of the vehicle and the driver's intention are acquired from the automatic transmission controller, that is, the TCU through various sensors mounted on the vehicle and the shift is determined, a control signal for controlling the hydraulic pressure is applied to the shift solenoid mounted inside, Output. The solenoid that receives the control signal generates an appropriate hydraulic pressure for the clutch or brake. In this process, a clutch or a brake wears excessively to cause a slip, a foreign matter enters the solenoid, and a hydraulic pressure is not applied to each of the clutches and the brakes, do.

In the prior art, it is confirmed whether or not the automatic transmission that is the object of diagnosis has completed the current shift operation, and the sensor for detecting the input / output speed of the automatic transmission operates normally. Then, the difference between the calculated input speed and the measured input speed calculated by the gear ratio and the output speed of the automatic transmission is compared with a predetermined error value, and a gear ratio shift error is detected according to the input speed difference, that is, the error value. Then, it is checked whether or not the detected gear ratio deviation failure continues for the set time period. If it is confirmed that the error more than the setting value lasts longer than the set time, the diagnosis of the gear shift error is finalized.

However, in the prior art, since the automatic transmission input shaft and output shaft speed values are used for the diagnosis of the gear ratio failure, there is a case where the automatic transmission input shaft and the output shaft speed sensor malfunction due to failure of the gear ratio failure. That is, there is a problem in that a failure has actually occurred in the speed sensor but it is determined that the gear ratio is defective.

Korea Patent No. 10-2012-0058870 (Diagnosis and recovery method of gear ratio shift of automatic transmission)

The inventors of the present application recognize the above-mentioned problems and propose the following technical problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fault detection system and method for an automatic transmission that can detect whether the input / output speed of an automatic transmission is normal or a gear ratio deviation is defective.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a fault detection system and method for an automatic transmission that can check an input shaft speed sensor abnormality by comparing an automatic transmission input / output signal with a wheel speed signal .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fault detection system and method for an automatic transmission capable of detecting an automatic transmission output shaft speed sensor failure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fault detection system and method for an automatic transmission that can distinguish between a gear ratio failure and a transmission input shaft speed sensor failure when a problem does not occur in an automatic transmission output shaft signal.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a system and method for detecting a failure of an automatic transmission capable of detecting a failure of a wheel speed sensor.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to an aspect of the present invention, there is provided a failure detection system for an automatic transmission, including: an automatic transmission; a gear wheel connected to the automatic transmission; A first speed sensor for detecting a speed of an input shaft of the automatic transmission and outputting a first detection signal; A second speed sensor for detecting a speed of an output shaft of the automatic transmission and outputting a second detection signal; A third speed sensor for detecting a speed of the gear wheel and outputting a third detection signal, and a second speed sensor for detecting a gear ratio failure of the automatic transmission based on the first detection signal, the second detection signal, A speed sensor, an electronic control unit (ECU) for distinguishing faults of the second speed sensor and the third speed sensor.

The failure detection system for an automatic transmission according to an embodiment of the present invention is configured such that a value obtained by dividing a transmission gear ratio by an input shaft speed of the automatic transmission and an output shaft speed of the automatic transmission are equal to each other when the vehicle is not shifted during forward or reverse travel Wherein the first value is calculated by multiplying the value obtained by dividing the output shaft speed of the automatic transmission and the differential gear ratio by the same radius and if the first value is not equal to the speed of the gear wheel, It is determined that one of the first speed sensor, the second speed sensor, and the third speed sensor has failed.

The failure detection system for an automatic transmission according to an embodiment of the present invention is configured such that a difference between a value obtained by multiplying an output shaft speed of the automatic transmission by a transmission gear ratio and an input shaft speed of the automatic transmission differ from a set value, It is determined that the second speed sensor has failed.

A failure detection system for an automatic transmission according to an embodiment of the present invention calculates a second value by multiplying an output shaft speed of the automatic transmission by a shift gear ratio, and the second value is equal to the input shaft speed of the automatic transmission, And if the first value differs by more than the set value, it is determined that the third speed sensor has failed.

The failure detection system of the automatic transmission according to the embodiment of the present invention is characterized in that the speed of the gear wheel is equal to the first value and the input shaft speed of the automatic transmission is lower than a second value obtained by multiplying the speed of the automatic transmission output shaft by the transmission gear ratio And determines that the first speed sensor is broken if the difference between the input shaft speed of the automatic transmission and the second value is equal to or greater than a set value.

The failure detection system for an automatic transmission according to the embodiment of the present invention is characterized in that when the speed of the gear wheel is equal to the first value and the input shaft speed of the automatic transmission is smaller than the value obtained by multiplying the output shaft speed of the automatic transmission by the transmission gear ratio , It is determined that the gear ratio of the automatic transmission is out of order.

The fault detection system and method of an automatic transmission according to an embodiment of the present invention can distinguish and detect whether the input / output speed of the automatic transmission is normal or the gear ratio deviation is defective.

The system and method for detecting failure of an automatic transmission according to an embodiment of the present invention can check the presence or absence of an input shaft speed sensor by comparing an automatic transmission input / output signal with a wheel speed signal.

The fault detection system and method of an automatic transmission according to an embodiment of the present invention can detect an automatic transmission output shaft speed sensor failure.

The failure detection system and method of an automatic transmission according to an embodiment of the present invention can distinguish between a gear ratio failure and a transmission input shaft speed sensor failure when a problem does not occur in an automatic transmission output shaft signal.

A fault detection system and method of an automatic transmission according to an embodiment of the present invention can detect a failure of a wheel speed sensor.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 is a diagram showing a failure detection system of an automatic transmission according to an embodiment of the present invention.
2 is a diagram showing a detection method when the vehicle is in a normal state.
3 is a diagram showing a method of detecting an output shaft speed sensor failure of an automatic transmission.
4 is a diagram showing a wheel speed sensor failure detection method.
5 is a diagram showing a method of detecting an automatic transmission input shaft speed sensor failure.
6 is a view showing a method of detecting a gear ratio shift failure of an automatic transmission.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain parts that are described as being "below" other parts are described as being "above " other parts. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

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.

The system and method for detecting failure of an automatic transmission according to an embodiment of the present invention can check the presence or absence of a speed sensor by comparing a transmission input / output signal with a wheel speed signal. In addition, if there is no problem in the automatic transmission output shaft signal, it is possible to distinguish between the gear ratio failure and the transmission input shaft speed sensor failure.

1 is a diagram showing a failure detection system of an automatic transmission according to an embodiment of the present invention.

Referring to FIG. 1, a failure detection system 100 of an automatic transmission according to an embodiment of the present invention includes an automatic transmission 110, a gear wheel 120, a first speed sensor 130, a transmission input shaft speed sensor, A speed sensor 140, a transmission output shaft speed sensor, a third speed sensor 150, a wheel speed sensor, and an electronic control unit (ECU) 160.

The automatic transmission 110 is a device that automatically changes gears so as to automatically obtain the optimum torque conversion in accordance with the running speed and load of the automobile. That is, the operation of the clutch and the gear shift is automatically performed by the machine in accordance with the driving situation instead of the driver. The automatic transmission 110 includes a torque converter, a clutch plate, and a planetary gear. The torque converter transmits the power generated by the engine to the gear portion. The friction clutch transmits the power generated from the torque converter to the gear portion. The planetary gear is composed of gears. The gear ratio of the gear .

The gear wheel 120 is connected to the differential gear and rotates at a predetermined speed according to the output of the differential gear.

The first speed sensor 130 is disposed to correspond to the input shaft 112 of the automatic transmission 110 and detects the speed of the input shaft 112 of the automatic transmission 110. Generates the first detection signal DS1 according to the speed of the input shaft 112 of the detected automatic transmission 110 and outputs the generated first detection signal DS1 to the ECU 160. [

The second speed sensor 140 is disposed so as to correspond to the output shaft 114 of the automatic transmission 110 and detects the speed of the output shaft 114 of the automatic transmission 110. [ Generates the second detection signal DS2 according to the speed of the output shaft 114 of the detected automatic transmission 110 and outputs the generated second detection signal DS2 to the ECU 160. [

The third speed sensor 150 (wheel speed sensor) is arranged to correspond to the gear wheel 120, and detects the speed of the gear wheel 120. Generates the third detection signal DS3 according to the speed of the detected gear wheel 120 and outputs the generated third detection signal DS3 to the ECU 160. [

The ECU 160 receives the first detection signal DS1 input to the first speed sensor 130 and the second detection signal DS2 input from the second speed sensor 140 and the transmission output shaft speed sensor, And the third speed sensor 130 (140, 150) based on the third detection signal DS3 input from the third speed sensor 150 (wheel speed sensor) Can be detected.

The ECU 160 is connected to a first speed sensor 110 arranged to correspond to the input shaft 112 of the automatic transmission 110 on the basis of the first detection signal DS1, the second detection signal DS2 and the third detection signal DS3, It is possible to detect a failure of the battery 130.

Specifically, the ECU 160 is arranged to correspond to the output shaft 114 of the automatic transmission 110 on the basis of the first detection signal DS1, the second detection signal DS2 and the third detection signal DS3 A failure of the second speed sensor 140 can be detected. The ECU 160 further includes a third speed sensor 150 arranged to correspond to the gear wheel 120 based on the first detection signal DS1, the second detection signal DS2 and the third detection signal DS3, Can be detected. Then, the ECU 160 can detect a gear ratio misalignment of the automatic transmission 110 based on the first detection signal DS1, the second detection signal DS2, and the third detection signal DS3.

2 is a diagram showing a detection method when the vehicle is in a normal state.

A detection method when the vehicle is in a normal state will be described with reference to FIG.

ECU 160 determines whether or not the value obtained by dividing the transmission gear ratio by the automatic transmission input shaft speed detected by the first speed sensor 130 (transmission input shaft speed sensor) in a state in which no shift is made during forward or backward travel, It is confirmed whether the automatic transmission output speeds detected by the second speed sensor 140 (transmission output shaft speed sensor) are the same (S10).

Subsequently, the ECU 160 determines whether the value obtained by multiplying the value obtained by dividing the automatic transmission output speed detected by the second speed sensor 140 (transmission output shaft speed sensor) by the differential gear ratio is multiplied by the vehicle dynamic radius, It is confirmed whether the speeds of the gear wheels 120 detected by the sensor 150 (wheel speed sensor) are the same (S12).

If it is determined that the results of the first checking step S10 and the second checking step S12 are all the same, the first to third speed sensors 130, 140, 150 and the automatic transmission 110 It is judged that the vehicle operates normally because no failure occurs in the gear ratio. If any of the results of the first checking step (S10) and the second checking step (S12) is not satisfied, the first to third speed sensors (130, 140, 150) and the automatic transmission (Step S14).

3 is a diagram showing a method of detecting an output shaft speed sensor failure of an automatic transmission.

A method of detecting the failure of the output shaft speed sensor of the automatic transmission will be described with reference to FIG.

The ECU 160 determines whether or not the value obtained by multiplying the speed of the automatic transmission output shaft 114 detected by the second speed sensor 140 by the shift gear ratio and the speed of the automatic transmission input shaft 112 detected by the first speed sensor 130, (S20).

Then, the ECU 160 calculates a value obtained by multiplying the value obtained by dividing the automatic transmission output shaft speed detected by the second speed sensor 140 by the differential gear ratio and the value obtained by multiplying the value by the radius, and the value obtained by multiplying the gear wheel 120 detected by the third speed sensor 150, (Step S22).

It is determined that the second speed sensor 140 (transmission output shaft speed sensor) disposed to correspond to the output shaft 114 of the automatic transmission 110 has failed (S24) .

4 is a diagram showing a wheel speed sensor failure detection method.

A method of detecting a failure of the wheel speed sensor will be described with reference to FIG.

It is confirmed whether the value obtained by multiplying the speed of the automatic transmission output shaft 114 detected by the second speed sensor 140 by the shift gear ratio is equal to the speed of the automatic transmission input shaft 112 detected by the first speed sensor 130 (S30) .

Next, a value obtained by multiplying the value obtained by dividing the output gear ratio of the automatic transmission and the differential gear ratio detected by the second speed sensor 140 by the radius is compared with a value obtained by multiplying the wheel speed detected by the third speed sensor 50 by more than a set value (S32).

If the result of S30 is "same" and the result of S32 is "difference occurred", it is determined that the third speed sensor 150 arranged to correspond to the gear wheel 120 has failed (S34).

5 is a diagram showing a method of detecting an automatic transmission input shaft speed sensor failure.

A method of detecting a failure of the input shaft speed sensor of the automatic transmission will be described with reference to FIG.

It is determined whether the value obtained by multiplying the value obtained by dividing the speed of the output shaft 114 of the automatic transmission and the differential gear ratio detected by the second speed sensor 140 by the radius is equal to the wheel speed detected by the third speed sensor 150 S40).

Then, it is determined whether the speed of the automatic transmission input shaft 112 detected by the first speed sensor 130 is smaller than the speed of the automatic transmission output shaft 114 multiplied by the shift gear ratio. Then, it is determined whether the difference between the speed of the input shaft 112 of the automatic transmission and the speed of the automatic transmission output shaft 114 multiplied by the shift gear ratio is equal to or greater than a predetermined value (S42). That is, it is confirmed that the speed of the automatic transmission input shaft 112 is smaller than a value obtained by multiplying the speed of the automatic transmission output shaft 114 by the shift gear ratio, and that the difference is equal to or greater than a set value. Here, when a failure occurs in the first speed sensor 130, the speed of the engine is lowered to 0 rpm.

If the result of S40 is "same" and the result of S42 is "the speed of the automatic transmission input shaft 112 is smaller than the speed of the automatic transmission output shaft 114 multiplied by the shift gear ratio, Quot ;, it is determined that the first speed sensor 130 arranged to correspond to the input shaft 112 of the automatic transmission has failed (S44).

6 is a view showing a method of detecting a gear ratio shift failure of an automatic transmission.

A method of detecting a gear ratio shift failure of an automatic transmission will be described with reference to Fig.

It is determined whether the value obtained by multiplying the value obtained by dividing the speed ratio of the output shaft 114 of the automatic transmission and the differential gear ratio by the second speed sensor 140 by the radius is equal to the wheel speed detected by the third speed sensor 150 ).

Subsequently, it is determined whether or not the speed of the automatic transmission input shaft 112 detected by the first speed sensor 130 is greater than a value obtained by multiplying the speed of the automatic transmission output shaft 114 detected by the second speed sensor 140 by the speed change gear ratio (S54). Here, in the case of a failure in the gear ratio deviation, the speed of the automatic transmission input shaft 112 becomes higher than the actual gear ratio due to the clutch slip.

If the result of S52 is "same" and the result of S54 is "greater than the set value ", it is determined that the gear ratio of the automatic transmission 110 is out of order and a failure occurs (S54).

The fault detection system and method of an automatic transmission according to an embodiment of the present invention can distinguish and detect whether the input / output speed of the automatic transmission is normal or the gear ratio deviation is defective. In addition, the system and method for detecting failure of an automatic transmission according to an embodiment of the present invention can check the presence or absence of an input shaft speed sensor by comparing an automatic transmission input / output signal with a wheel speed signal.

The fault detection system and method of an automatic transmission according to an embodiment of the present invention can detect an automatic transmission output shaft speed sensor failure. The system and method for detecting failure of an automatic transmission according to an embodiment of the present invention can distinguish between a gear ratio failure and a transmission input shaft speed sensor failure when a problem does not occur in an automatic transmission output shaft signal. Further, a system and method for detecting a failure of an automatic transmission according to an embodiment of the present invention can detect a failure of a wheel speed sensor.

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 present invention as defined by the following claims and their equivalents. Only. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Automatic transmission failure detection system
110: automatic transmission 110,
120: Gear wheel
130: first speed sensor (transmission input shaft speed sensor)
140: Second speed sensor (transmission output shaft speed sensor)
150: Third sensor (wheel speed sensor)
160: electronic control unit (ECU)

Claims (6)

A gear wheel connected to an automatic transmission;
A first speed sensor for detecting a speed of an input shaft of the automatic transmission and outputting a first detection signal;
A second speed sensor for detecting a speed of an output shaft of the automatic transmission and outputting a second detection signal;
A third speed sensor for detecting the speed of the gear wheel and outputting a third detection signal,
Wherein a value obtained by dividing a speed ratio of the input shaft of the automatic transmission by a speed ratio of the output shaft of the automatic transmission is not equal to a value obtained by dividing a speed ratio of the input shaft of the automatic transmission during forward or backward travel, The first speed sensor, the second speed sensor, and the third speed sensor, the first speed sensor, the second speed sensor, the third speed sensor, and the third speed sensor, and if the speed of the gear wheel is not equal to the first value, An electronic control unit (ECU) judging that any one of the speed sensors has failed;
Lt; / RTI >
When the difference between the value obtained by multiplying the output shaft speed of the automatic transmission by the transmission gear ratio and the input shaft speed of the automatic transmission exceeds a predetermined value and the difference between the first value and the speed of the gear wheel exceeds a set value, It is determined that the second speed sensor has failed,
The ECU determines that the speed of the gear wheel is equal to the first value and the input shaft speed of the automatic transmission is greater than a value obtained by multiplying the output shaft speed of the automatic transmission by the shift gear ratio, When it is judged that the gear ratio is broken,
Automatic transmission failure detection system.
delete delete The method according to claim 1,
Wherein the ECU calculates a second value by multiplying an output shaft speed of the automatic transmission by a speed change gear ratio, wherein the input shaft speed of the automatic transmission is equal to the second value, And determines that the third speed sensor has failed if an abnormality occurs in the third speed sensor.
The method according to claim 1,
Wherein the ECU determines that the speed of the gear wheel is equal to the first value and the input shaft speed of the automatic transmission is smaller than a second value obtained by multiplying the speed of the automatic transmission output shaft by the shift gear ratio, And determines that the first speed sensor has failed if the difference between the first and second values is equal to or greater than the set value. delete
KR1020150188650A 2015-12-29 2015-12-29 Failure Detecting System and Method of an Automatic Transmission KR101771823B1 (en)

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KR1020150188650A KR101771823B1 (en) 2015-12-29 2015-12-29 Failure Detecting System and Method of an Automatic Transmission

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KR101771823B1 true KR101771823B1 (en) 2017-08-25

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