KR101661867B1 - Apparatus and method for diagnosing abnormal state of inhibitor switch - Google Patents

Apparatus and method for diagnosing abnormal state of inhibitor switch Download PDF

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Publication number
KR101661867B1
KR101661867B1 KR1020150187719A KR20150187719A KR101661867B1 KR 101661867 B1 KR101661867 B1 KR 101661867B1 KR 1020150187719 A KR1020150187719 A KR 1020150187719A KR 20150187719 A KR20150187719 A KR 20150187719A KR 101661867 B1 KR101661867 B1 KR 101661867B1
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South Korea
Prior art keywords
inhibitor switch
information
switch
failure state
speed
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KR1020150187719A
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Korean (ko)
Inventor
김연태
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주식회사 현대케피코
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K20/00—Arrangement or mounting of change-speed gearing control devices in vehicles
    • B60K20/02—Arrangement or mounting of change-speed gearing control devices in vehicles of initiating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
    • B60W50/0205—Diagnosing or detecting failures; Failure detection models
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • G01R31/025—

Abstract

The present invention relates to an apparatus and method for diagnosing failure of an inhibitor switch. In order to achieve the above object, there is provided an apparatus for diagnosing failure of an inhibitor switch, comprising: an information collector, which is output from an inhibitor switch and periodically collects switch output information indicating a position of a shift lever; And a tactile sensor for detecting a tactile angle with respect to the surface of the shift lever and generating tactile sense information, wherein the tactile sensor includes a failure occurrence determination unit for determining whether the inhibitor switch is malfunctioning based on the switch output information, When the tactile angle is not detected on the surface of the shift lever but the output of the inhibitor switch is changed, the inhibitor switch is judged to be in a failure state.

Figure R1020150187719

Description

[0001] APPARATUS AND METHOD FOR DIAGNOSING ABNORMAL STATE OF INHIBITOR SWITCH [0002]

The present invention relates to an apparatus and method for diagnosing failure of an inhibitor switch, and more particularly, to a failure diagnosis apparatus and method capable of improving the diagnostic accuracy of an inhibitor switch and identifying the types of failures in the event of a failure.

Control of the inhibitor switch in an automatic transmission that controls the hydraulic pressure via electrical control is very important. See FIG. If the driver moves the shift lever according to the driving situation to turn the automatic transmission into the P, R, N or D state, the inhibitor switch outputs a signal according to the position of the shift lever. As shown in Fig. 8, the signal of the inhibitor switch may include four, and each signal may represent P stage, R stage, N stage and D stage, respectively

The shift control unit determines the state of the shift lever based on the signal of the inhibitor switch and controls the solenoid for controlling the hydraulic pressure. Here, the applied transmission oil operates the clutch or the brake to form a gear stage through the planetary gear set (see Fig. 1).

That is, in order to drive the vehicle, the precise position of the inhibitor lever must be determined, and logic for determining the position must be implemented. If an appropriate location and signal is not applied, the system should be made more stable by performing fault diagnosis accordingly.

In this regard, Korean Patent Publication No. 2012-0137147 (entitled "Inhibitor Switch Fault Diagnosis Method and Shift Control System") exists. As disclosed in Korean Patent Publication No. 2012-0137147, the failure diagnosis of the conventional inhibitor switch adopts a method of determining that there is only one output through the inhibitor switch and that the failure is determined to be normal. That is, according to the conventional fault diagnosis method, only one of the P signal, the R signal, the N signal, and the D signal needs to be outputted. When two signals, three signals, or four signals are output from the inhibitor switch , And diagnoses it as a failure.

However, in this method, the position of the shift lever is in the D-stage. However, there is a problem in that, even when the R-stage signal is recognized in the shift control section, the shift control section can not detect the mistaken- In addition, in the case of the above example, there may be various failure causes such as the above-described possibility of false recognition, disconnection at the D-stage connection portion, and short-circuit at the R-stage connection portion. The conventional technology has a problem that it can not detect such a failure and also can not grasp the cause of the failure.

In this case, for example, while the driver is traveling in the D-stage, the driver wants to travel in the forward direction, but the vehicle can be controlled in the R-end, that is, the backward direction. In this case, the transmission control unit operates the solenoid according to the R-stage, which may cause problems due to the formation of the oil pressure on the valve body, thereby causing a great shock in the transmission. In addition, there is a problem that the transmission itself may be damaged and a vehicle accident may occur in severe cases.

Korea Patent Publication No. 2012-0137147 (Name: Inhibitor Switch Fault Diagnosis Method and Shift Control System)

The present invention can accurately detect a situation in which the shift control section misrecognizes the lever position due to the occurrence of an electric disconnection or a short circuit due to an external environmental cause although the inhibitor lever state is normal and accordingly the failure of the inhibitor switch can be detected more accurately And an object thereof is to provide an apparatus and method for diagnosing failure of an inhibitor switch capable of diagnosing faults and diagnosing fault types in the event of faults.

According to an aspect of the present invention, there is provided an apparatus for diagnosing failure of an inhibitor switch, comprising: an information collecting unit that is output from an inhibitor switch and periodically collects switch output information indicating a position of a shift lever; And a tactile sensor for detecting a tactile angle with respect to the surface of the shift lever and generating tactile sense information, wherein the tactile sensor includes a failure occurrence determination unit for determining whether the inhibitor switch is malfunctioning based on the switch output information, When the tactile angle is not detected on the surface of the shift lever but the output of the inhibitor switch is changed, the inhibitor switch is judged to be in a failure state.

Further, the information collecting unit may further collect speed information of the engine, speed information of the turbine, and speed information of the vehicle.

Further, in the failure diagnostic apparatus for an inhibitor switch according to an embodiment of the present invention, when the inhibitor switch is determined to be in a failure state, And a failure type determination unit for determining whether the beater switch is in an electrical failure state or a mechanical failure state.

The failure type determination unit may determine that the inhibitor switch is in a mechanical failure state when the speed change amount of the engine exceeds the first threshold value during the shift preparation time when the inhibitor switch is determined to be in a failure state.

The failure type determination unit may determine that the inhibitor switch is in the mechanical failure state when the speed change amount of the turbine exceeds the second threshold value during the shift preparation time when the inhibitor switch is determined to be in a failure state.

In addition, when the inhibitor switch is determined to be in a failure state, the failure type determination unit may determine that the inhibitor switch is in a mechanical failure state when the acceleration variation amount of the vehicle exceeds the third threshold value during the actual shift time.

When the inhibitor switch is determined to be in a failure state, the failure type determination unit determines whether the inhibitor switch is in a mechanical failure state based on the engine speed information, the turbine speed information, and the vehicle speed information, When the speed of the turbine and the acceleration of the vehicle are normal, the inhibitor switch can be judged as an electrical fault condition.

Further, the information collecting unit may further collect lever position information of the shift lever from the shift lever.

Further, the failure occurrence determination unit can determine whether the inhibitor switch is faulty by comparing the lever position information and the switch output information.

Further, the apparatus for diagnosing an inhibitor switch according to an embodiment of the present invention further includes a monitoring unit for performing monitoring when the shift lever is positioned at the D-stage and the speed of the vehicle is equal to or higher than a predetermined monitoring reference speed, The comparison of the lever position information and the switch output information through the determination unit may be made when the monitoring is performed.

According to another aspect of the present invention, there is provided a method for diagnosing failure of an inhibitor switch, comprising: collecting, by an information collecting unit, switch output information output from an inhibitor switch and indicating a position of a shift lever; Sensing a tactile angle with respect to a surface of the shift lever by a tactile sensor, and generating tactile sense information; And judging whether or not the inhibitor switch is faulty based on the switch output information by the fault occurrence judging unit, wherein the step of judging whether the inhibitor switch is faulty or not comprises the steps of: When the output of the Beater switch is changed, the inhibitor switch is judged to be in a failure state.

Further, the fault diagnosis method of the inhibitor switch of the present invention may further include the step of collecting speed information of the engine, speed information of the turbine, and speed information of the vehicle by the information collecting unit.

According to another aspect of the present invention, there is provided a method for diagnosing failure of an inhibitor switch, comprising the steps of: detecting at least one of speed information of the engine, speed information of the turbine, And determining whether an electrical failure or a mechanical failure of the inhibitor switch is present.

The step of determining whether the inhibitor switch is in an electrical failure state or a mechanical failure state includes the steps of: when the inhibitor switch is judged to be in a failure state, when the speed change amount of the engine exceeds a first threshold value during the shift preparation time, The beater switch can be judged as a mechanical failure state.

The step of determining whether the inhibitor switch is in an electrical failure state or a mechanical failure state includes the steps of: when the inhibitor switch is judged to be in a failure state, if the speed variation of the turbine during the shift preparation time exceeds a second threshold value, Can be judged as a mechanical failure state.

In addition, the step of determining whether the inhibitor switch is in an electrical failure state or a mechanical failure state includes: when the inhibitor switch is determined to be in a failure state, when the vehicle acceleration variation amount exceeds the third threshold value during the actual shift time, It can be judged as a mechanical failure state.

The step of determining whether the inhibitor switch is in an electrical failure state or a mechanical failure state may include determining whether the inhibitor switch is in a failure state based on the speed information of the engine, the speed information of the turbine, It is possible to judge whether the mechanical failure has occurred or not and to determine that the inhibitor switch is in an electrical failure state when the engine speed, the turbine speed, and the vehicle acceleration are normal.

Further, the fault diagnosis method of the inhibitor switch of the present invention may further comprise the step of collecting lever position information of the shift lever from the shift lever by the information collecting unit.

Also, the step of determining whether the inhibitor switch is malfunctioned may be further performed by comparing the lever position information and the switch output information.

Further, in the fault diagnosis method of an inhibitor switch according to the present invention, monitoring may be performed by the monitoring unit when the shift lever is positioned at the D-stage and the speed of the vehicle is equal to or higher than a predetermined monitoring reference speed, The comparison of the lever position information and the switch output information through the step of determining whether the beater switch is faulty may be performed when monitoring is performed.

According to the fault diagnosis apparatus and method of the inhibitor switch of the present invention, it is possible to prevent a fault situation in which a signal of the inhibitor switch is output differently from the position of the shift lever, and to detect the type of the fault Failure) can be grasped.

Further, according to the fault diagnosis apparatus and method of the inhibitor switch of the present invention, the willingness of the driver to travel can be taken into consideration, and the diagnosis accuracy of the inhibitor switch can be further improved, thereby improving the stability.

1 is a block diagram of a shift system to which a fault diagnosis apparatus according to an embodiment of the present invention is applied.
2 is a block diagram of an apparatus for diagnosing failure of an inhibitor switch according to an embodiment of the present invention.
FIG. 3 and FIG. 4 are graphs for explaining a method for determining a type of a fault through a fault type determination unit according to an embodiment of the present invention.
5 is a flowchart illustrating a fault diagnosis method of an inhibitor switch according to an embodiment of the present invention.
6 is a flowchart illustrating a process for determining whether an inhibitor switch fails or not according to an exemplary embodiment of the present invention.
FIG. 7 is a flowchart illustrating a method for determining a failure type of an inhibitor switch according to an embodiment of the present invention. Referring to FIG.
8 is a conceptual diagram for illustrating an inhibitor switch.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Hereinafter, the inhibitor switch failure diagnosis apparatus 100 according to the embodiment of the present invention will be described. 1 is a block diagram of a shift system to which a fault diagnosis apparatus 100 according to an embodiment of the present invention is applied. As described above, in the shift system, when the driver operates the shift lever 13, the inhibitor switch 14 outputs a signal in accordance with the position of the shift lever 13, The solenoid 15 is controlled to control the hydraulic pressure. At this time, when the passage of the valve body is formed by the opening and closing of the solenoid 15, the planetary gear set 16 is actuated by the internal clutch and brake to form the gear (for example, Stage or first-stage to eight-stage), and as a result, the gear ratios of the stages are different, and the output speed is determined.

However, when the inhibitor switch 14 is defective as described above, there may be a situation where the inhibitor switch 14 outputs a signal that does not correspond to the position of the shift lever 13. Therefore, the fault diagnosis apparatus 100 of the inhibitor switch according to the embodiment of the present invention is capable of correctly diagnosing whether the inhibitor switch 14 is faulty or not, and informing the driver or the operator of the failure through the display unit . In addition, the fault diagnosis apparatus 100 of the inhibitor switch according to the embodiment of the present invention is characterized in that, when a fault is detected, the kind of the fault is accurately grasped and the information of the fault is also informed to the driver or the operator.

The failure diagnostic apparatus 100 of the inhibitor switch according to an embodiment of the present invention includes an engine 11, a turbine 12, a shift lever 13, an inhibitor switch 14, and a planetary gear set 16, the speed information of the engine, the speed information of the turbine, the lever position information of the shift lever, the switch output information of the inhibitor switch, and the speed information of the gear shaft. To this end, a speed sensor (not shown) may be further provided for each of the engine 11, the turbine 12 and the planetary gear set 16, and a position sensor (not shown) . The shift lever 13 may further include a tactile sensor and a load sensor for determining the driver's will to travel, as described below. Further, the failure diagnosis apparatus 100 according to the embodiment of the present invention can further collect the speed information of the vehicle from the vehicle speed sensor 50. [

The fault diagnosis apparatus 100 of the inhibitor switch according to an embodiment of the present invention performs monitoring of the transmission system based on the collected information and determines whether the failure of the inhibitor switch 14 has occurred or not based on the collected information, You can also identify the type of fault. Now, referring to FIG. 2, description will be made of a fault diagnosis method through the fault diagnosis apparatus 100 of the inhibitor switch according to an embodiment of the present invention.

2 is a block diagram of an apparatus 100 for diagnosing failure of an inhibitor switch according to an embodiment of the present invention. 2, an apparatus 100 for diagnosing failures of an inhibitor switch according to an embodiment of the present invention includes an information collecting unit 110, a monitoring unit 120, a will determination unit 130, A determination unit 140, and a fault type determination unit 150. [ Hereinafter, an apparatus 100 for diagnosing failure of an inhibitor switch according to an embodiment of the present invention will be described with reference to FIG.

The information collecting unit 110 collects information from the structures included in the transmission system. Specifically, the information collecting unit 110 collects a signal (hereinafter referred to as switch output information) output from the inhibitor switch and lever position information indicating the position of the shift lever from a position sensor provided on the shift lever. The collection function through the information collection unit 110 may be repeated periodically.

The monitoring unit 120 performs monitoring on an inhibitor switch based on information collected through the information collecting unit 110. [ Here, the monitoring through the monitoring unit 120 can be divided into a preparation stage and an execution stage. The reason why the monitoring is divided into the respective stages is to diagnose whether or not the failure diagnosis of the inhibitor switch is more accurately diagnosed.

That is, it is preferable that the fault diagnosis method of the inhibitor switch according to the embodiment of the present invention is performed after the monitoring is performed, and the precondition for monitoring is that the brake is off, Or more. Here, the predetermined monitoring reference speed may be variably set, preferably from 3 to 7 km / h, more preferably 5 km / h. Monitoring through the monitoring unit 120 may be performed in consideration of the driver's will to be described below. In the following description, it is assumed that the shift lever is located at the D-stage. This is in many cases actually located at the D-stage during the running of the vehicle, and there is a prerequisite for the speed for the above-mentioned monitoring.

The drive will determination unit 130 uses the load sensor 41 and the tactile sensor 42 to determine the driver's will to operate. Here, the load sensor 41 may be installed near the driver's seat or on the seat to determine whether or not the driver is boarding the vehicle, and the tactile sensor 42 may be used to detect whether or not the tactile sensor is sensed in the shift lever.

The failure occurrence determination unit 140 determines whether the inhibitor switch is failed based on the switch output information collected through the information collection unit 110. [ In addition, the fault diagnosis apparatus 100 of the inhibitor switch according to an embodiment of the present invention performs a fault diagnosis in consideration of the willingness of the driver to travel. That is, if the driver is in a state of having a shift or a will to drive through the drive determination unit 130, the tactile sensor or the pressure can be sensed through the tactile sensor 42 because the user directly grips the lever and operates the lever. In this case, the output of the inhibitor switch also changes with the operation of the driver.

Conversely, there may be a situation where the driver does not directly change the shift lever but the output of the inhibitor switch changes. That is, there may be a situation where the output of the inhibitor switch is changed although no separate tactile sense or pressure is sensed in the shift lever. This is because the output of the inhibitor switch is changed irrespective of the driver's will, so that the failure occurrence determination unit 140 can determine that the inhibitor switch is in a failure state.

This is because it is impossible for the inhibitor lever to be changed from the D-stage to the P-stage, the R-stage or the N-stage without the driver's will in a situation where the vehicle is normally running. Therefore, when the signal of the inhibitor switch is changed (when the shift lever is at the D-stage or when the inhibitor switch is turned on) Is a P-stage, an R-stage or an N-stage), it can be determined that a fault has occurred due to an electric disconnection or a short circuit problem or an abnormal operation of the transmission control unit. This makes it possible to prevent a sudden failure and downshift of the planetary gear.

In addition, the fault diagnosis apparatus 100 according to an embodiment of the present invention can further determine whether or not a failure of the inhibitor switch occurs in addition to the above-described method. This is a method using a position sensor connected to the shift lever.

That is, the failure occurrence determining unit 140 can determine whether the inhibitor switch is broken by comparing the lever position information of the shift lever collected through the information collecting unit 110 with the switch output information of the inhibitor switch. Accordingly, when the output of the inhibitor switch is outputted in the R stage, the N stage, or the P stage although the shift lever is located at the D stage, it is possible to diagnose whether or not the inhibitor switch has failed through the comparison.

The failure type determination unit 150 performs a function when a failure occurs in the inhibitor switch through the failure occurrence determination unit 140 and determines a type of failure. Specifically, the failure type determination unit 150 determines whether a solenoid stuck has occurred in the solenoid connected to the shift control unit, and determines the type of failure based on whether or not the solenoid stuck occurs. 3 and 4.

Fig. 3 is a graph for explaining an example in which an excessive blow-up occurs during a shift, and Fig. 4 is a graph for explaining an example in which an acceleration variation is excessive. In FIGS. 3 and 4, the x-axis represents time, and specifically shows an axis indicated by dividing the shift time into three sections, that is, the shift preparation time, the actual shift time, and the shift completion time. 3, the y-axis represents the speed (rpm) of the engine or the turbine, and the y-axis represents the acceleration of the vehicle speed.

FIG. 3 shows an example in which excessive blow-up occurs at the engine or turbine speed, as in the circled portion. This indicates a situation in which the amount of change in the engine or turbine speed exceeds the predetermined threshold range during the shifting preparation time before the actual shifting in the shifting process. Then, as shown in Fig. 4, the acceleration of the vehicle changes within a predetermined range as shown by the shift preparation time and the shift completion time. However, when the amount of change in acceleration, such as the actual shift time, exceeds a preset range, it can be seen that the amount of change in acceleration is excessive.

The examples described with reference to FIGS. 3 and 4 show situations in which a solenoid stuck does not occur but a current anomaly exists. That is, the absence of a solenoid stuck means that it is not stuck, indicating that solenoid control and actuation are being performed. However, as shown in Fig. 3 and Fig. 4, abnormally solenoid and hydraulic pressure control cause a situation where the engine, turbine or vehicle acceleration is abnormally controlled. In this case, the failure type determination unit 150 determines that the solenoid stuck does not occur but determines that the inhibitor switch is an interlock of the transmission, and can determine that the inhibitor switch is a mechanical failure.

Conversely, a case where a solenoid stuck occurs will be described. The occurrence of the solenoid stuck means that the solenoid stuck, indicating that the solenoid remains in the original state. In other words, it can be confirmed that an abnormal electrical signal is coming in when there is no impact, but the signal can not be normally applied, and an electrical (software) defect is generated in the sense that it is abnormally detected in a situation where control can not be performed . The failure type determination unit 150 according to an embodiment of the present invention determines whether an inhibitor switch is a mechanical failure when a failure first occurs and may determine that the failure is an electrical failure if the failure is not a mechanical failure. Now, a method of determining whether or not the inhibitor switch is in a mechanical failure state through the failure type determination unit 150 will be described.

As described with reference to FIG. 3 and FIG. 4, the failure type determination unit 150 according to an embodiment of the present invention determines a mechanical failure of the inhibitor switch when a solenoid stuck has not occurred but an abnormality has occurred. Specifically, when determining that the inhibitor switch is in a failure state, the failure type determination unit 150 determines whether an excessive blow-up phenomenon occurs in the speed change amount of the engine or turbine or an excessive amount of acceleration change of the vehicle occurs It is possible to determine whether or not a mechanical defect exists. For this purpose, the speed information of the engine, the speed information of the turbine, and the speed information of the vehicle can be further collected through the government collection unit 110. Here, the speed information of the engine and the turbine can be collected from the speed sensor connected to the engine and the turbine as described with reference to Fig. 1, and the speed information of the vehicle can be collected from a speed sensor connected to the planetary gear set, .

The failure type determination unit 150 collects the above-described speed information, and can calculate the speed change amount of the engine or the speed, and the acceleration change amount of the vehicle based on the speed information of the engine or the turbine. That is, when the inhibitor switch is determined to be in a failure state, the failure type determination unit 150 may determine that the inhibitor switch is in a mechanical failure state when the speed variation amount of the engine exceeds the first threshold value or more. Likewise, when the inhibitor switch is determined to be in a failure state, the failure type determination unit 150 may determine that the inhibitor switch is in a mechanical failure state when the speed change amount of the turbine exceeds the second threshold value. The failure type determination unit 150 may determine that the inhibitor switch is in a mechanical failure state when the acceleration variation amount of the vehicle exceeds the third threshold value when it is determined that the inhibitor switch is in a failure state. Here, the first threshold value, the second threshold value and the third threshold value represent numerical values preset by the operator or the operator, and each threshold value can be variably adjusted.

If the inhibitor switch is determined to be in a fault state but the inhibitor switch is not determined to be a mechanical failure, the failure type determination unit 150 can determine that the electrical failure has occurred. That is, when the inhibitor switch is determined to be in a failure state, the failure type determination unit 150 may determine that the inhibitor switch is in an electrical failure state when the speed of the engine, the speed of the turbine, and the acceleration of the vehicle are normal.

When the occurrence of the failure and the type of the failure are determined, the failure type determination unit 150 keeps the present gear position. When the shift lever is in the D-stage state, the failure type determination unit 150 continuously displays the D- (30), thereby causing the driver to recognize the failure situation.

As described above, in the fault diagnosis of the conventional inhibitor switch, there is a fault diagnosis for the disconnection or short circuit. However, in a complex situation, the signal is normally output due to disconnection or short circuit. It is difficult to confirm the detection method.

On the other hand, the apparatus 100 for diagnosing failure of the inhibitor switch according to an embodiment of the present invention grasps the will of the driver on the basis of information detected from a tactile sensor connected to the inhibitor lever or a load sensor of the vehicle seat, The mechanical or electrical failure of the inhibitor switch can be judged by considering the brake off and the vehicle speed condition. If the information of the control stage other than the D stage is displayed without a signal to be sensed by the tactile sensor at this time, it is a mechanical or electrical problem other than the driver's will .

Accordingly, according to the fault diagnosis apparatus 100 of the inhibitor switch according to the embodiment of the present invention, when the shift lever is actually located at the D-stage but is recognized as another control stage due to some electrical problem, There is an advantage in that it can be determined whether it should be regarded as a D-stage or considered as another control stage, or whether it should be judged as a failure by an inappropriate control.

In addition, through an apparatus 100 for diagnosing failure of an inhibitor switch according to an embodiment of the present invention, an unexpected situation is determined, and the validity of the inhibitor switch is examined to analyze the problem. Here, if it is determined that there is a problem, the failure diagnosis can be performed, thereby preventing the occurrence of an abnormal shift or an interlock in the valve body, thereby damaging the clutch or brake of the transmission.

5 is a flowchart illustrating a fault diagnosis method of an inhibitor switch according to an embodiment of the present invention. In the following, description overlapping with the above-mentioned parts is omitted.

First, the information collecting unit collects information indicating information on each configuration of the transmission system (S110). Here, the step S110 may include periodically collecting the switch output information, which is output from the inhibitor switch, indicating the position of the shift lever. The step S110 may further include collecting lever position information of the shift lever from the position sensor connected to the shift lever, and collecting speed information of the engine, speed information of the turbine, and speed information of the vehicle from the speed sensor have.

Thereafter, a step of determining whether monitoring is possible by the monitoring unit (S120) is performed. Specifically, step S120 is a step of determining whether the shift lever is positioned at the D-stage and the speed of the vehicle is equal to or higher than a predetermined monitoring reference speed. In the case of the conditions for such monitoring, the above conditions are generally used in the transmission system and the description thereof is made above, so that further explanation is omitted. If it is determined through the determination in step S120 that the monitoring is possible, control is passed to step S130 to perform monitoring. Otherwise, control passes to step S110, where the above-described steps are performed again.

Step S140 is a step of generating tactile information from the tactile sensor connected to the shift lever and transmitting it to the information collecting unit. As described above, the fault diagnosis method of the inhibitor switch according to an embodiment of the present invention is characterized in that the diagnosis is performed in consideration of the shift or the will of the driver. For this purpose, it is required to determine whether the driver has boarded the vehicle and whether the driver has gripped the shift lever, and step S140 is a step for determining whether the driver holds the shift lever.

Step S150 is a step of determining a shift or a driver's will based on the tactile information received through step S140. In addition to the tactile sensor described above, the driver's will can be determined using a load sensor installed on the vehicle seat.

Thereafter, a step (S160) of judging whether or not the inhibitor switch has failed is performed. As described above, step S160 can be largely accomplished through two methods. In step S150, if the output of the inhibitor switch is changed when it is determined that there is no driver's intention to drive, the first failure determination method is determined to be in a failure state. After the monitoring is started in step S130, the second failure determination method in step S150 compares the lever position information collected through step S110 with the switch output information. If the information is different, it is determined that the lever position information is in a failure state Method. The method for determining whether or not a failure has occurred through step S160 will be described later with reference to FIG. 6, and a further explanation will be omitted.

Thereafter, in step S160, it is determined whether a failure has been detected in step S160. If it is determined in step S170 that a failure has not occurred, control is transferred to the return block. Otherwise, control is passed to step S180.

In step S180, it is determined whether an electrical failure or mechanical failure has occurred in the inhibitor switch based on at least one of the speed information of the engine, the speed information of the turbine, and the speed information of the vehicle collected through step S110. That is, in step S180, it is determined whether or not the inhibitor switch is mechanically broken by comparing the speed of the engine or the turbine with a predetermined threshold value, and comparing the amount of change in acceleration of the vehicle with a preset threshold value. It can be judged as an electrical failure.

In step S190, the fixed information for the fault type and the fault type determined through steps S160 and S180 is generated and displayed on the display unit.

6 is a flowchart illustrating a process for determining whether an inhibitor switch fails or not according to an exemplary embodiment of the present invention. Referring now to FIG. 6, a description will be given of a step of determining whether the inhibitor switch is malfunctioning (S160). In the following, description overlapping with the above-mentioned parts is omitted.

First, in step S140, it is determined whether a tactile sense is sensed (S161). As described above, the fault diagnosis method of the inhibitor switch according to the embodiment of the present invention is characterized by confirming the shift or running will of the driver. That is, when the tactile sense is detected, the driver can be confirmed that there is a shift or a will to drive. As a result of the determination in step S161, if it is determined that there is a shift or a will to drive to the driver, the control is transferred to step S163. Otherwise, control passes to step S162.

Step S162 is a step of determining whether the output of the inhibitor switch has changed. As described above, there is no problem when the driver makes a shift to a state with his or her will, but it is an abnormal situation that the shift is made irrespective of the driver's will. Accordingly, if the output of the inhibitor switch is changed while the tactile sense is not detected in step S162, control is passed to step S164 to determine that the inhibitor switch is in a failure state. Otherwise, control passes to step S163.

Step S163 compares the lever position information collected through step S110 with the switch output information. Here, the lever position information can be generated based on the position sensor connected to the shift lever. That is, if two pieces of information indicate the same stage, it is in a normal state, otherwise it is in a fault state. Accordingly, it is determined in step S163 whether the lever position information and the switch output information are identical. If the two information are identical to each other in step S163, control passes to step S165 to determine that the corresponding inhibitor switch is in a normal state. Otherwise, control is passed to step S164 to determine that the inhibitor switch is in a failure state do.

FIG. 7 is a flowchart illustrating a method for determining a failure type of an inhibitor switch according to an embodiment of the present invention. Referring to FIG. Referring to FIG. 7, description will now be made of a step of determining a failure type of the inhibitor switch according to an embodiment of the present invention (S180).

As described with reference to FIG. 2 to FIG. 5, a method of determining the failure type (mechanical failure or electrical failure) of the inhibitor switch according to an embodiment of the present invention determines whether the inhibitor switch corresponds to a mechanical failure , Otherwise, the corresponding inhibitor switch is judged as an electrical failure. Here, the mechanical failure can be made on the basis of whether an excessive blow-up has occurred in the engine or turbine speed change as described with reference to Figs. 3 and 4, and on whether the acceleration change of the vehicle is excessively large.

To this end, the speed variation of the engine is calculated first, and the step of comparing the speed variation of the engine with the predetermined first threshold value (S181) is performed. If the speed change amount of the engine is equal to or greater than the predetermined first threshold value in step S181, excessive blow-up occurs in the engine speed, so control is transferred to step S184 to determine that the inhibitor switch is a mechanical failure. Otherwise, control is passed to step S182.

The step S182 is a step of calculating a speed change amount of the turbine and comparing the speed change amount of the turbine with a predetermined second threshold value. If the speed change amount of the turbine is equal to or greater than the predetermined second threshold value in step S182, excessive blow-up occurs in the turbine speed, so control is transferred to step S184 to determine that the inhibitor switch is a mechanical failure. Otherwise, control is passed to step S183.

The step S183 is a step of calculating an acceleration change amount of the vehicle and comparing the acceleration change amount of the vehicle with a predetermined third threshold value. If the acceleration change amount of the vehicle is equal to or greater than the predetermined third threshold value in step S183, the acceleration of the vehicle is excessively changed. Therefore, control is transferred to step S184 to determine that the inhibitor switch is a mechanical failure. If it is confirmed that the engine speed, the turbine speed, and the vehicle acceleration change amount are all within the normal range through steps S181 to S183, it indicates that there is no impact but the signal can not be normally applied. Therefore, And the step of determining that the inhibitor switch is in an electrical failure state is performed.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Inhibitor switch fault diagnosis device
110: Information collecting unit 120: Monitoring unit
130: Running will determination unit 140: Failure occurrence determination unit
150: Fault type determination unit

Claims (20)

An information collecting unit that is output from the inhibitor switch and periodically collects switch output information indicating the position of the shift lever; And
And a failure occurrence determination unit for determining whether the inhibitor switch is malfunctioning based on the switch output information,
Further comprising a tactile sensor for sensing a tactile angle to the surface of the shift lever and generating tactile sense information,
Wherein the failure occurrence determination unit determines that the inhibitor switch is in a failure state when the tactile sense is not detected on the surface of the shift lever but the output of the inhibitor switch has changed,
The information collecting unit further collects the speed information of the engine, the speed information of the turbine, and the speed information of the vehicle,
A failure type determining unit for determining whether the inhibitor switch is in an electrical or mechanical failure state based on at least one of speed information of the engine, speed information of the turbine, and speed information of the vehicle, Further comprising a determination unit,
The fault type determination unit,
And determines whether or not the inhibitor switch is in a mechanical failure state based on the speed information of the engine, the speed information of the turbine, and the speed information of the vehicle when the inhibitor switch is determined to be in a failure state. And when the acceleration of the vehicle is normal, judges the inhibitor switch to be in an electrically faulty state. delete delete The method according to claim 1,
The fault type determination unit,
Wherein the inhibitor switch is in a mechanical failure state when the speed change amount of the engine exceeds a first threshold value during the shift preparation time when the inhibitor switch is judged to be in a failure state, Of the fault diagnosis apparatus. The method according to claim 1,
The fault type determination unit,
Wherein when the speed change amount of the turbine exceeds a second threshold value during a shift preparation time when the inhibitor switch is judged to be in a failure state, the inhibitor switch is judged as a mechanical failure state Diagnostic device. The method according to claim 1,
The fault type determination unit,
Wherein the inhibitor switch is in a mechanical failure state when the inhibit switch is judged to be in a failure state and the acceleration variation amount of the vehicle exceeds an third threshold value during the actual shift time, Diagnostic device. delete The method according to claim 1,
Wherein the information collecting unit further collects lever position information of the shift lever from the shift lever. 9. The method of claim 8,
Wherein the failure occurrence determination unit
Wherein the failure detector further determines whether the inhibitor switch is faulty by comparing the lever position information with the switch output information. 10. The method of claim 9,
Further comprising a monitoring unit for performing monitoring when the shift lever is positioned at the D-stage and the speed of the vehicle is equal to or higher than a predetermined monitoring reference speed,
Wherein the comparison of the lever position information and the switch output information through the failure occurrence determination unit is performed when the monitoring is performed. Periodically collecting switch output information output from the inhibitor switch by the information collecting unit and indicating the position of the shift lever;
Sensing a tactile sense with respect to a surface of the shift lever by a tactile sensor, and generating tactile sense information; And
And determining whether the inhibitor switch is malfunctioning based on the switch output information by the malfunction occurrence determination unit,
Wherein the step of determining whether the inhibitor switch is malfunctioned includes determining that the inhibitor switch is in a malfunction state when no tactile sense is sensed at the surface of the shift lever but the output of the inhibitor switch is changed,
Collecting speed information of the engine, speed information of the turbine, and speed information of the vehicle by the information collecting unit; And
Wherein when the inhibitor switch is determined to be in a failure state, the failure type determination unit determines whether the inhibitor switch is in a failure state based on at least one of speed information of the engine, speed information of the turbine, Further comprising the step of:
The step of determining whether the inhibitor switch is in an electrical or mechanical failure state comprises:
And determines whether or not the inhibitor switch is in a mechanical failure state based on the speed information of the engine, the speed information of the turbine, and the speed information of the vehicle when the inhibitor switch is determined to be in a failure state. And determining that the inhibitor switch is in an electrical failure state when the acceleration of the vehicle is normal. delete delete 12. The method of claim 11,
The step of determining whether the inhibitor switch is in an electrical or mechanical failure state comprises:
Wherein the inhibitor switch is in a mechanical failure state when the speed change amount of the engine exceeds a first threshold value during the shift preparation time when the inhibitor switch is judged to be in a failure state, Fault diagnosis method. 12. The method of claim 11,
The step of determining whether the inhibitor switch is in an electrical or mechanical failure state comprises:
Wherein when the speed change amount of the turbine exceeds a second threshold value during a shift preparation time when the inhibitor switch is judged to be in a failure state, the inhibitor switch is judged as a mechanical failure state Diagnostic method. 12. The method of claim 11,
The step of determining whether the inhibitor switch is in an electrical or mechanical failure state comprises:
Wherein the inhibitor switch is in a mechanical failure state when the inhibit switch is judged to be in a failure state and the acceleration variation amount of the vehicle exceeds an third threshold value during the actual shift time, Diagnostic method. delete 12. The method of claim 11,
Further comprising the step of collecting lever position information of the shift lever from the shift lever by the information collecting unit. 19. The method of claim 18,
The step of determining whether the inhibitor switch is malfunctioned comprises:
And comparing the lever position information with the switch output information. 20. The method of claim 19,
Further comprising monitoring by the monitoring unit if the shift lever is positioned at the D-end and the speed of the vehicle is equal to or greater than a predetermined monitoring reference speed,
Wherein the comparison of the lever position information and the switch output information through the step of determining whether the inhibitor switch is faulty is performed when the monitoring is performed.
KR1020150187719A 2015-12-28 2015-12-28 Apparatus and method for diagnosing abnormal state of inhibitor switch KR101661867B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180126128A (en) 2017-05-16 2018-11-27 현대자동차주식회사 Detecting method of gear-position for shift-by-wire system

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Publication number Priority date Publication date Assignee Title
KR20020058903A (en) * 2000-12-30 2002-07-12 이계안 Method for detecting error of input speed sensor of automatic transmission for a vehicle
KR20050022664A (en) * 2003-08-29 2005-03-08 현대자동차주식회사 Apparatus and method for preventing a shift lever manipulation error of an automatic transmission
KR20120137147A (en) 2011-06-10 2012-12-20 현대자동차주식회사 Method for diagnosing inhibitor switch fail and shift control system for the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020058903A (en) * 2000-12-30 2002-07-12 이계안 Method for detecting error of input speed sensor of automatic transmission for a vehicle
KR20050022664A (en) * 2003-08-29 2005-03-08 현대자동차주식회사 Apparatus and method for preventing a shift lever manipulation error of an automatic transmission
KR20120137147A (en) 2011-06-10 2012-12-20 현대자동차주식회사 Method for diagnosing inhibitor switch fail and shift control system for the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180126128A (en) 2017-05-16 2018-11-27 현대자동차주식회사 Detecting method of gear-position for shift-by-wire system

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