KR100387511B1 - Method For Fail Decision Of PG-B Sensor In Automatically Transmission - Google Patents

Abstract

The automatic transmission detects the speed of the transfer drive gear to diagnose the failure of the PG-B sensor that detects the vehicle speed.

The present invention is a process for determining whether the information detected in the driving mode of the forward gear satisfies the failure condition of the set PG-B sensor, and if it is determined that the failure condition is satisfied, fixing the current gear stage, and the current shift However, after fixing, the process of checking the failure of the PG-B sensor, if it is determined that the failure of the PG-B sensor, outputting the self-diagnosis code and fixing the current shift stage for a predetermined time, and the shift lever after the set time If the "D" range position is a three-speed fixed, "2", "L" range is characterized in that it comprises a process for maintaining a two-speed fixed.

Therefore, it is possible to prevent the three-speed fixed running due to the failure of the vehicle speed sensor, thereby eliminating unnecessary replacement and repair of the PG-B sensor.

In addition, it provides the reliability of maintenance by eliminating false diagnosis which diagnoses the failure of the vehicle speed sensor as the failure of the PG-B sensor when the vehicle is in service and receives the reliability of the consumer by not performing the failure diagnosis on the instantaneous vehicle speed input due to noise. To provide.

Description

Method for Fail Decision Of PG-B Sensor In Automatically Transmission}

The present invention relates to an automatic transmission, and more particularly, to a method of diagnosing a failure of a sebaceous sensor of an automatic transmission for diagnosing a failure of a PG-B sensor detecting a vehicle speed by detecting a rotation speed of a transfer drive gear. It is about.

In the conventional automatic transmission, a method for diagnosing a breakdown-related failure of a PG-B sensor and performing control therefor includes a PG-B having a shift lever positioned at a range of "D '," 2 "and" L ". Shift control when the current vehicle speed (No) detected from the sensor lasts for a predetermined time, preferably 1 sec or more, than the vehicle speed (Vss) detected by the reed switch. The means judges the failure of the PG-B sensor and maintains the three speed lock if the shift lever is located in the "D" range, and the two speed lock if the shift lever is located in the "2" and "L" range. To keep the car stable.

In addition, the current turbine speed is detected while the current shift stage maintains the speeds of "2", "3" and "4" while the shift lever is located in the ranges of "D '," 2 "and" L ". The vehicle speed No detected by the PG-B sensor is "0" or detected by the reed switch when (Nt) is equal to or greater than the set rotational speed (1000 RPM) or the current engine rotation speed (Ne) is equal to or greater than the set rotational speed (3000 RPM). If the vehicle speed (Vss) is maintained at "0" for a predetermined time, preferably 240 msec or more continuously, the shift control means judges that the PG-B sensor is broken and the shift lever is located in the "D" range. The third speed is maintained until the ignition off point, and the second speed is maintained until the ignition off point when the shift lever is positioned in the "2" and "L" ranges.

Also, while the shift lever is located in the ranges "D", "2", and "L", the current shift stage is maintained at "1" speed and the opening ratio of the throttle valve TH is set to a value (15% or more). The engine speed Ne is set at the set speed (3000 RPM) and the vehicle speed (No) detected from the PG-B sensor is "0" or the vehicle speed (Vss) detected from the reed switch is "0" for a certain time. Preferably, if it is maintained for 5 seconds or more, the shift control means determines that the PG-B sensor is broken and, if the shift lever is located in the "D" range, maintains the 3-speed fixed until the ignition off point, and the shift lever is "2". If it is located in the "L" range, it maintains the 2nd speed until the ignition off point.

In addition, the current rate of the vehicle detected by the PG-B sensor is maintained at a constant speed, preferably 900 RPM or more, for example, a rate at which the change rate of the vehicle speed is set, for example, 40 RPM or more per one cycle (per 20 msec). Is reduced, the shift control means judges that the PG-B sensor is faulty, and if the shift lever is located in the "D" range, it maintains three speeds until the ignition is turned off, and the shift lever is in the "2" and "L" ranges. If it is located at, it maintains 2 speed fixed until the ignition off point.

As described above, the conventional automatic transmission determines the disconnection determination criterion of the PG-B sensor based on the vehicle speed signal, so that the failure of the PG-B sensor is judged as a failure of the PG-B sensor even when there is a problem in the actual vehicle signal. It has a disadvantage.

That is, the signal of the PG-B sensor is normally output, but there is a problem in that even if the vehicle speed signal is not input due to the disconnection or failure of the vehicle speed sensor, the failure of the PG-B sensor is determined. However, when the signal of the vehicle speed sensor is abnormally input due to the instantaneous noise problem, for example, even when the maximum value is instantaneously input, it is judged as a failure of the PG-B sensor due to the difference between the input values of the vehicle speed sensor and the PG-B sensor. The problem occurs.

In addition, when the 3 speed is fixed due to the failure of the PG-B sensor, the 3 speed is fixed after a certain delay time, so if another shift occurs between them, the normal speed is changed because the vehicle speed of the PG-B sensor is abnormal. There is a problem that the control shock is not carried out, the shift shock occurs.

The present invention has been invented to solve the above problems, the object of which is to determine the rate of change of the signal (No) and the vehicle speed (Vss) output from the PG-B sensor to prohibit downshift shifting, and after a certain time By comparing the turbine speed or engine speed with the vehicle speed (No) from the PG-B sensor, the final failure of the PG-B sensor can be determined to diagnose the actual failure of the PG-B sensor.

In addition, the vehicle speed limit value is set so that when noise is input within the limit vehicle speed value, the instantaneous change rate can be determined to determine whether there is an abnormality in the vehicle speed signal, thereby providing reliability in determining the failure of the PG-B sensor.

1 is a configuration block diagram of a PG-B sensor failure diagnosis apparatus of an automatic transmission according to the present invention.

2A and 2B are flow charts of one embodiment for performing PG-B sensor fault diagnosis of an automatic transmission in accordance with the present invention.

The present invention for realizing the above object comprises the steps of determining whether the information detected in the driving mode of the forward gear satisfies the failure condition of the set PG-B sensor;

Fixing the current shift stage when it is determined that the failure condition is satisfied;

Checking a failure of the PG-B sensor after fixing the current shift stage;

Outputting a self-diagnosis code and fixing the current shift stage for a predetermined time when it is determined that the PG-B sensor has been broken;

After the set time, if the shift lever is in the "D" range position 3 speed, "2", "L" range is characterized in that it comprises a step of maintaining the second speed fixed.

The failure possibility determination of the PG-B sensor may include determining whether the PG-B signal (No) detected in the forward driving mode is greater than or equal to the set reference rotation speed;

If the signal No of the PG-B sensor is equal to or greater than the reference rotation speed, calculating a rate of change per cycle to determine whether the PG-B sensor decreases by more than the set reference value;

Determining whether the current vehicle speed Vss is included in the reference value range when the rate of change per cycle is not reduced by more than the reference value;

Determining whether the vehicle speed Vss is within a set reference value by calculating a rate of change of the current period and the previous period when the vehicle speed Vss is included in the range of the reference value;

If the rate of change of the vehicle speed (Vss) is included in the reference value range, calculating the PG-B signal (No) vs. the vehicle speed (Vss) to determine whether the PG-B signal (No) is reduced below the reference value compared to the vehicle speed (Vss). and;

If it is determined that the change rate per cycle of the PG-B sensor is lower than the reference value or the PG-B sensor signal (No) is reduced below the reference value relative to the vehicle speed (Vss), it is determined that there is a possibility of failure of the PG-B sensor. It characterized in that it comprises a process of fixing the current gear.

In addition, the failure confirmation of the PG-B sensor may include determining whether the vehicle speed Vss detected in a state in which the current shift stage is fixed is greater than or equal to a set reference speed;

Determining whether the turbine speed Nt or the engine speed Ne is equal to or greater than the reference speed when the vehicle speed Vss is equal to or less than the set reference speed;

If the vehicle speed Vss is equal to or greater than the reference speed or the turbine speed Nt or the engine speed Ne is equal to or greater than the reference speed, whether the current PG-B sensor signal No is detected at a speed of "0". Judging process;

Determining whether the state is maintained for one or more cycles when the signal (No) of the PG-B sensor is detected at a speed of "0";

If the signal (No) of the PG-B sensor is maintained for one period at a speed of "0", characterized in that it comprises the step of outputting a failure diagnostic code of the PG-B sensor.

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

As can be seen in Figure 1 PG-B sensor failure diagnosis apparatus of the automatic transmission according to the present invention is a vehicle speed detection unit 10, the engine speed detection unit 20, the turbine speed detection unit 30, PG-B sensor ( 40, the controller 50, the actuator 60 and the display 70, the vehicle speed detector 10 is a reed switch built in the cluster to detect the current traveling speed and outputs an electrical signal for it. In addition, the engine speed detection unit 20 detects the current engine speed (RPM) and outputs the information about it as an electrical signal, the turbine speed detection unit 30 in the torque converter consisting of the impeller, the stator and the turbine Detect the number of revolutions of the turbine on the output side and output an electrical signal for it, PG-B sensor 40 detects the number of revolutions on the output side in the automatic transmission and outputs an electrical signal for it.

The control unit 50 controls the overall shifting operation in the automatic transmission, and analyzes the information detected in the state of the forward gear in which the shift lever is located in the ranges "D", "2", and "L" to analyze the PG-B. Diagnose the abnormality of sensor and control it.

The actuator 60 controls the line pressure and the duty pressure according to the control signal applied from the controller 50 to perform shift control suitable for the current vehicle condition, and the display unit 70 controls the PG-B in the current vehicle being operated. When a sensor abnormality is detected, the contents of the diagnostic code and a warning message are output according to the control signal of the controller 50.

An operation of an embodiment of diagnosing a failure of a PG-B sensor in the present invention including the above function will be described with reference to FIG. 2.

When the automatic transmission vehicle starts the next driving located in the "D", "2" and "L" ranges in which the shift lever is in the forward gear state, the control unit 50 is a vehicle speed detection unit 10 including a reed switch provided in a cluster. Information on the current vehicle speed Vss and information on the current engine speed from the engine speed detection unit 20, information on the rotation speed of the current turbine from the turbine speed detection unit 30 and the PG-B sensor 40 The information of the current vehicle speed No is read and the appropriate shift control is performed (S101).

In the state where the shift control is being carried out as described above, the controller 50 determines whether the signal No detected by the PG-B sensor 40 is a set reference speed, preferably 900 RPM or more (S102). If it is determined that the reference speed is greater than or equal to the reference speed, it is determined whether the rate of change of the PG-B signal No per cycle is reduced to the reference value or more (S103) (S104).

If it is determined that the PG-B signal (No) is reduced to, for example, 40 RPM or more per one cycle (20 msec), the fixed time set to prevent the inadvertent downshift or the third speed fixed by the wrong input signal determination, preferably Gives the current gear stage fixed for 100 msec (S105).

If it is determined in step S104 that the rate of change of the PG-B signal No per cycle is less than or equal to the reference value, it is determined whether the current vehicle speed Vss detected is included in the range of the reference value, preferably 45 KPH or more and 200 KPH. (S106).

The reference value range setting of the vehicle speed Vss is set in order not to perform a failure determination of the PG-B sensor when the vehicle speed is instantaneously inputted to the highest vehicle speed due to the inflow of noise.

If it is determined that the current vehicle speed is included in the range of the reference value, the change rate of the vehicle speed (Vss) of the previous period and the current period is calculated (S107) to determine whether it is included within the set reference value, for example, 20 KPH (S108). ).

If the rate of change of the vehicle speed Vss remains within the range of the reference value, the reduction rate of the PG-B signal No compared to the current vehicle speed Vss is calculated to determine whether the set reference value is preferably 30% or less. (S109) (S110).

When it is determined that the reduction is greater than the reference value, the current shift stage is fixed for a predetermined time, preferably 100 msec, set for three-speed fixing or unintentional downshift due to a wrong input signal determination (S105).

The current vehicle speed (Vss) is maintained at a set reference speed, preferably 45KPH or more, in order to determine whether the PG-B sensor is actually broken in a state where the current shift stage is fixed for a predetermined time set according to the above conditions. It is determined whether or not (S111).

If the current vehicle speed Vss is maintained below the set reference speed, the turbine speed Nt or the engine speed Ne is a reference speed, preferably the turbine speed is 1000 RPM or more, and the engine speed is 3000 RPM It is determined whether the above is maintained (S112).

If it is determined that the current vehicle speed Vss is maintained above the set reference speed or the turbine speed Nt or the engine speed Ne is maintained above the set reference speed, the signal of PG-B (No) It is determined whether is detected as a state of "0" (S113).

If the signal No of the PG-B is detected as "0" in the above, it is determined whether the set period is maintained continuously, preferably 250 msec or more (S114).

If the signal No of the PG-B is "0" but is not detected for a predetermined period, the counter value is increased (S115), and the current shift stage is fixed. It returns to the operation and repeats the above-described operation (S116).

If it is detected that the signal (No) of the PG-B has been maintained for more than one period set to "0", it is determined that the PG-B sensor is broken and outputs a diagnostic code and at the same time drives a timer. (S117) (S118).

Subsequently, it is determined whether the countered time has elapsed, preferably 1 second (that is, 250 msec x 4 times), which is 4 cycles, and when it is determined that the set time has elapsed, it is determined that the PG-B sensor has failed and a warning message is issued. Output and at the same time control the actuator 60 to maintain the three-speed fixed when the current shift lever is located in the "D" range, when the shift lever is located in the "2" or "L" range 2 It keeps the speed fixed to keep the vehicle running.

When the shift lever is positioned in the "P", "R", or "N" range in the above-mentioned diagnosis of the PG-B sensor, and during creep control, during up / down shifting or the "N" range The disconnection detection operation is not performed while controlling to the "D" range at.

As described above, the present invention determines the rate of change of the signal (No) and the vehicle speed (Vss) of the PG-B sensor to perform the current shift stage fixing, and after a certain time, the turbine speed or the engine speed and the PG- By comparing the vehicle speed from the signal (No) of the B sensor and finally determining whether the PG-B sensor is broken, the three-speed fixed driving due to the failure of the vehicle speed sensor is prevented, and unnecessary replacement and repair of the PG-B sensor is caused. This is excluded.

In addition, it provides the reliability of maintenance by eliminating false diagnosis which diagnoses the failure of the vehicle speed sensor as the failure of the PG-B sensor when the vehicle is in service and receives the reliability of the consumer by not performing the failure diagnosis on the instantaneous vehicle speed input due to noise. To provide.

Claims (8)

Determining whether the information detected in the driving mode of the forward gear satisfies the set fault condition of the PG-B sensor; Fixing the current shift stage when it is determined that the failure condition is satisfied; Checking a failure of the PG-B sensor after fixing the current shift stage; Outputting a self-diagnosis code and fixing the current shift stage for a predetermined time when it is determined that the PG-B sensor has been broken; If the shift lever is in the "D" range position after the set time, the three-speed, if the "2", "L" range, and the second speed fixing method comprising the step of maintaining a fixed speed of the automatic transmission, characterized in that The method of claim 1, The failure condition of the PG-B sensor may include determining whether the PG-B signal (No) detected in the forward driving mode is greater than or equal to a set reference speed; If the signal No of the PG-B sensor is equal to or greater than the reference rotation speed, calculating a rate of change per cycle to determine whether the PG-B sensor decreases by more than the set reference value; Determining whether the current vehicle speed Vss is included in the reference value range when the rate of change per cycle is not reduced by more than the reference value; Determining whether the vehicle speed Vss is within a set reference value by calculating a rate of change of the current period and the previous period when the vehicle speed Vss is included in the range of the reference value; If the rate of change of the vehicle speed (Vss) is included in the reference value range, calculating the PG-B signal (No) vs. the vehicle speed (Vss) to determine whether the PG-B signal (No) is reduced below the reference value compared to the vehicle speed (Vss). and; If it is determined that the change rate per cycle of the PG-B sensor is lower than the reference value or the PG-B sensor signal (No) is reduced below the reference value relative to the vehicle speed (Vss), it is determined that there is a possibility of failure of the PG-B sensor. Fiji ratio sensor failure determination method of an automatic transmission comprising the step of fixing the current gear stage. The method of claim 1, The failure confirmation of the PG-B sensor may include determining whether the vehicle speed Vss detected while the current shift stage is fixed is greater than or equal to a set reference speed; Determining whether the turbine speed Nt or the engine speed Ne is equal to or greater than the reference speed when the vehicle speed Vss is equal to or less than the set reference speed; If the vehicle speed Vss is equal to or greater than the reference speed or the turbine speed Nt or the engine speed Ne is equal to or greater than the reference speed, whether the current PG-B sensor signal No is detected at a speed of "0". Judging process; Determining whether the state is maintained for one or more cycles when the signal (No) of the PG-B sensor is detected at a speed of "0"; If the signal (No) of the PG-B sensor is maintained for one period at the speed of "0" in the above, the method for determining the failure of the Fiji ratio sensor of the automatic transmission comprising the step of outputting a failure diagnostic code of the PG-B sensor . The method of claim 1, Fiji ratio sensor failure determination method of the automatic transmission, characterized in that the current gear stage fixed after outputting the diagnostic mode of the PG-B sensor is maintained for 4 cycles 1 second. The method of claim 1, The failure determination of the PG-B sensor is not performed during shift control by the shift lever in the "P", "R", "N" range, creep control and up / down shift control. Judgment method. The method of claim 2, The reference rotational speed of the PG-B sensor is set to 900 RPM, the reference value for comparing the rate of change of the PG-B sensor is set to 40 RPM per 20msec per cycle, the current vehicle speed (Vss) range of 45KPH or more and 200KPH or less Fiji ratio of the automatic transmission, characterized in that the reference value of the change rate of the vehicle speed (Vss) per cycle is set to 20KPH, and the reference value of the rate of reduction of the PG-B sensor signal (No) is set to 30% relative to the vehicle speed (Vss). How to determine sensor failure. The method according to claim 3, Fiji of the automatic transmission characterized in that the reference vehicle speed (Vss) in the fixed state gear stage is set to 45KPH or more, the turbine speed (Nt) is set to 1000RPM, the engine speed (Ne) is set to 3000RPM How to determine non-sensor failure. The method of claim 2 or 6, The vehicle speed (Vss) range is set to prevent the recognition of noise as the maximum vehicle speed sebum ratio sensor failure determination method of the automatic transmission.