KR101367285B1 - method for ensuring the reliability of speed sensors for hybrid vehicle - Google Patents

Abstract

The present invention monitors each of the speed sensors as described above for each shift mode of the hybrid vehicle, and detects abnormal operation when an error between the monitored result and the normal value is greater than or equal to the reference value. At this time, when abnormal operation is detected more than a certain number of times, the speed sensor is determined to be faulty, and when the speed sensor returns to normal detection within a predetermined number of times, the speed sensor is normally determined. According to the present invention, it is possible to continuously secure the reliability of the output information output from the speed sensor of the hybrid vehicle, and to drive the driver safely based on the obtained output information.

Description

Method for ensuring the reliability of speed sensors for hybrid vehicle}

The present invention relates to a method for securing reliability of vehicle speed sensors, and more particularly to a method for detecting abnormal operation of hybrid vehicle speed sensors.

Recently, the demand for eco-friendly cars has increased due to the demand for improving fuel economy and tightening regulations on emission of harmful components of exhaust gases. Hybrid electric vehicles are attracting attention as a realistic alternative. In other words, the hybrid electric vehicle is a vehicle in which driving by an engine and driving by an electric motor are combined, such as driving by an engine, driving by an electric motor, and driving appropriately combined according to the state of the vehicle or the driving conditions of the vehicle. The driving state is maintained while appropriately varying the various driving modes.

Such hybrid vehicles are equipped with various speed sensors that detect driving information such as vehicle speed. These various speed sensors are connected with the control unit, and the control unit should analyze the detection signals provided from the various speed sensors so that the vehicle can exhibit the best driving performance under the optimum conditions.

That is, since the detection information from the speed sensors in the hybrid vehicle should provide high reliability, if necessary, it is determined whether the detection information is abnormally operated and informs the driver and the control unit of the failure information of each speed sensor to the vehicle. By making appropriate measures be taken, a method for improving driver safety is required.

Accordingly, an object of the present invention is to compare the output values detected from the speed sensors connected to the planetary gear set in the hybrid vehicle with the information expected when the vehicle is in a normal situation, and determine whether the speed sensors are abnormally operated, thereby determining the respective speeds. To ensure the reliability of the sensors.

The method for securing the reliability of the hybrid vehicle speed sensors of the present invention for achieving the above object, the first motor speed sensor and the output shaft speed sensor belonging to the first speed sensor group on the first planetary gear set side, and the second Collecting a speed value from a second motor speed sensor, an engine speed sensor, and an input shaft speed sensor belonging to the second speed sensor group on the planetary gear set side; a first detection value (D_b) of an element in which the brake operates in the planetary gear set; Comparing the first reference value REF1 to the first reference value REF1, and comparing the first detected value D_b with the second detected value D_b. Compared to the), and determining the failure of the first and second speed sensors.

According to the present invention, the speed sensor of the first motor, the speed sensor of the second motor, the engine speed sensor, the input shaft speed sensor (PG-A) and the output shaft speed sensor (PG-B) are monitored in real time, As clutches and brakes are actuated on the sun gear, carrier and ring gear, the expected sensor values are calculated for normal operation. By comparing these calculated values with the values obtained directly from the sensor, it is possible to secure the stability of the operation control by determining whether each speed sensor connected to the planetary gear is abnormally operated and improving its reliability.

In addition, even if the speed sensor of the first motor, the speed sensor of the second motor, the engine speed sensor, the input shaft speed sensor (PG-A) and the output shaft speed sensor (PG-B) detect an abnormal signal through a transient disturbance, the normal determination logic Through it is possible to ensure a high reliability of each speed sensor, it is possible to ensure the stability of the operation control.

1 is a block diagram showing an arrangement structure of the speed sensors according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a process of determining abnormality of speed sensors for a hybrid vehicle having the arrangement of FIG. 1.
3 is a flowchart illustrating an abnormality determination process of FIG. 2 in detail.

The present invention discloses a method for determining abnormal detection of a first motor, a second motor, an engine, an input shaft speed sensor PG-A, and an output shaft speed sensor PG-B of a hybrid vehicle. Also disclosed is a method of making normal determination as well as the abnormal detection.

In general, the present invention monitors the presence or absence of each of the speed sensors as described above, and detects abnormal operation when an error between the monitored result and the normal value is greater than or equal to the reference value. At this time, when abnormal operation is detected more than a certain number of times, the speed sensor is determined to be faulty, and when the speed sensor returns to normal detection within a predetermined number of times, the speed sensor is normally determined.

By doing so, the reliability of the output information output from the speed sensor of the hybrid vehicle can be secured continuously, and the driver can be safely driven based on the secured output information.

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

1 is a view showing an arrangement structure of speed sensors in a hybrid vehicle according to an embodiment of the present invention.

Referring to FIG. 1, in an arrangement structure of speed sensors in a hybrid vehicle according to an embodiment of the present disclosure, a plurality of speed sensors may be classified into a first speed sensor group and a second speed sensor group.

The first speed sensor group is speed sensors that directly or indirectly cooperate with a first planetary gear set (not shown) constituting the planetary gear set combination 20,

Output shaft speed sensor 190 (PG-B) for detecting the output shaft speed (out speed) of the first motor speed sensor 110 and the planetary gear set combination 20 to detect the rotational speed of the first motor (MG1) (MG1) ).

The second speed sensor group is speed sensors that directly or indirectly interlock with a second planetary gear set (not shown) that is geared in a predetermined manner according to the first planetary gear set and the shift mode.

The second motor speed sensor 150 for detecting the rotational speed of the second motor 15 (MG2), the speed sensor 130 and the planetary gear set combination 20 of the engine for detecting the rotational speed of the engine 13 (ENG) It includes an input shaft speed sensor 170 (PG-A sensor) for detecting the input shaft speed (input speed) of the.

Here, the first planetary gear set may include a first ring gear, a first sun gear, and a first carrier, and the second planetary gear set may include a second ring gear, a second sun gear, and a second carrier. Each gear is operated to be engaged and disengaged via a plurality of clutches and brakes according to a predetermined method for each shift mode. The shift mode may include an engine driving mode, an electric driving mode, and a mixed driving mode in which an engine driving mode and an electric driving mode are mixed. Accordingly, the first planetary gear set and the first gear may be configured in a gear coupling structure determined for each mode. 2 The planetary gear set is geared.

Accordingly, in a particular mode, the specific speed sensor connected to the first planetary gear set outputs a detection value associated with (or the same) as the specific speed sensor connected to the second planetary gear set. In view of this point, the present invention detects whether or not an abnormal operation (or output) of each speed sensor.

On the other hand, although not shown in detail in the drawings, the planetary gear set combination 20 composed of the first and second planetary gear set shifts the rotation from the input shaft in accordance with the gear ratio corresponding to the selected gear stage and outputs to the output shaft. This output rotation is distributed and transmitted to the left and right rear wheels 26 by the differential gear device 29 to drive the vehicle.

The control unit 22 illustrated in FIG. 1 receives the detected values from the speed sensors 110, 130, 170, 150, and 190 included in the first and second speed sensor groups, respectively, The failure of each speed sensor by comparing the detected value between the first planetary gear set side speed sensor and the second planetary gear side speed sensor according to the gear engagement structure between the first planetary gear set and the second planetary gear set for each mode. Determine whether or not the output is normal.

The determination result is transmitted to the display unit to inform the driver of the failure output and the normal output from time to time.

Hereinafter, a detailed process of determining whether a failure output of the speed sensors having the arrangement as shown in FIG. 1 will be described in detail with reference to FIGS. 2 to 3. For convenience of explanation, the speed sensors included in the first speed sensor group are referred to as first speed sensors, and the speed sensors included in the second speed sensor group are referred to as second speed sensors, respectively, for convenience.

Accordingly, the first speed sensor includes a first motor speed sensor 110 and an output shaft speed sensor 190. In this case, the value obtained from the first speed sensor is calculated by the value obtained from the first motor speed sensor 110, the value obtained from the output shaft speed sensor 190, and calculated from the two sensors 110 and 190. It may be any one of these values.

It is assumed that the second speed sensor is any one of the second motor speed sensor 150, the engine speed sensor 130, and the input shaft speed sensor 170. In addition, the detection value of the element that operates the brake in the planetary gear set is referred to as the first detection value D1, and the detection value that is compared with the normal detection value among the elements in which the clutch operates is detected by the second detection. This is called the value D2.

2 is a flowchart illustrating a normal and abnormal determination process of the speed sensors according to an embodiment of the present invention.

Referring to FIG. 2, first, the control unit 22 of FIG. 1 collects detection values detected from the first planetary gear set side first speed sensor group constituting the planetary gear set combination 20. At the same time, the detection values detected from the second planetary gear set-side second speed sensor group geared in a predetermined manner for each of the first planetary gear set and the shift mode are collected (S210).

Subsequently, the control unit 22 cooperates with the first speed sensor according to the detection value D_b when the brake is activated in the first speed sensor of the first speed sensor group and the gear engagement structure when the clutch is operated. The detected value D_c of the second speed sensor of the second speed sensor group is compared and processed according to the procedure shown in FIG. 3, and it is determined whether there is a failure (S220).

Subsequently, it is determined whether the first and second speed sensors are broken according to the processing result of step S220, and the driver is notified through the display unit (S230).

FIG. 3 is a flowchart showing step S220 of FIG. 2 in detail.

Referring to FIG. 3, among the detection values D_b and D_c collected in the step S210 of FIG. 2, whether the brake is the first detection value D_b of the element on which the brake operates, among the elements on which the clutch operates. It is determined whether the second detection value D_c is compared with the normal detection value (S310 and S320). Here, when the detection values D_b and D_c collected in the step S210 of FIG. 2 are not the first detection value D_b, the detection values D_b and D_c collected in the step S210 of FIG. 2, it is determined whether the detected value D_c is detected (S320).

When the detected values D_b and D_c collected in the step S210 of FIG. 2 are the first detected value D_b of the element in which the brake operates, the first detected value D_b and the first reference value REF1. ) Is compared (S330).

If the first detection value D_b is smaller than the first reference value REF1, the output of the first speed sensor outputting the first detection value D_b is determined to be normal (S340). At this time, the first detection value D_b determined to be normal is used to determine whether the second speed sensor is normally output in the future as in the following steps S350 and S360.

Meanwhile, the detection values D_b and D_c collected in the step S210 of FIG. 2 are not the first detection values D_b of the elements in which the brake operates, and the normal detection among the elements in which the clutch operates. When the second detection value D_c is compared with the value, it is checked whether the first detection value D_b is normal (S350).

As a result of the check, when the first detection value D_b is normal, the absolute value of the difference between the first detection value D_b and the second detection value D_c is compared with the second reference value REF2 (S360).

As a result of the comparison, when the absolute value of the difference between the first detection value D_b and the second detection value D_c is smaller than the second reference value REF2, the output of the second speed sensor is determined to be normal (S340). The determination result is provided to the driver via the display unit.

If the absolute value of the difference between the first detection value D_b of the first speed sensor and the second detection value D_c of the second speed sensor is greater than the second reference value REF2, the output of the second speed sensor is abnormal. It is determined (S370). That is, the output state of the first speed sensor is normal, and the output state of the second speed sensor is determined to be abnormal, respectively, and the determination results are provided to the driver through the display unit. At this time, the control unit 22 counts the abnormal output number of the first speed sensor and the abnormal output number of the second speed sensor through steps S330 and S360 of FIG. 3, respectively, and counts the abnormal number of abnormal outputs. Compare the reference number of times (S380).

If the counted abnormal output number is greater than the reference number, the control unit 22 determines the output state of the speed sensor as a failure (S390). At this time, if the counted abnormal output number is less than the reference number, the output state of the speed sensor is continuously monitored.

In addition, when the speed sensor abnormally outputs the detection value and outputs the detection value in the normal range again within the reference number of times, the speed sensor is abnormally determined to be normal.

As described above, the present invention continuously secures the reliability of the speed sensors of the hybrid vehicle and provides the driver with the detected value of the reliable speed sensor, thereby enabling the driver to drive safely.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It will be understood that the invention may be practiced.

Claims (5)

The first detection value detected when the brake is actuated by the first speed sensor of the first speed sensor group and the second speed sensor of the second speed sensor group which interlocks with the first speed sensor according to the gear fastening structure Collecting a second detection value detected when actuated;
Determining whether the first speed sensor is normal by comparing the first detection value with a first reference value;
If it is determined that the first speed sensor is normal, comparing the difference between the first detection value and the second detection value and the second reference value to determine whether the second speed sensor is faulty;
Method for ensuring the reliability of the hybrid vehicle speed sensor comprising a.
delete The method of claim 1, wherein determining whether there is a failure
Determining the second speed sensor as abnormal when the calculated difference value is higher than a second reference value.
Judging the second speed sensor as a failure when the calculated number of abnormal operations is higher than the reference number of times when the calculated difference value is higher than the second reference value.
Method for ensuring the reliability of the hybrid vehicle speed sensor, characterized in that.
The method of claim 1, wherein the first speed sensor,
At least one of the first motor speed sensor for detecting the rotational speed of the first motor and the output shaft speed sensor of the automatic transmission,
The second speed sensor,
At least one of a second motor speed sensor detecting a rotation speed of a second motor, an engine speed sensor detecting an engine speed, and an input shaft speed sensor detecting an input shaft speed of the automatic transmission. How to get confidence.
The method of claim 4, wherein the detected value of the first speed sensor is
At least one of a detection value from the first motor speed sensor, a detection value from the output shaft speed sensor, and a detection value calculated using the first motor speed sensor and the output shaft speed sensor. To ensure their reliability.

Images