KR101252894B1 - Method and Apparatus for Providing Torque Sensor Failsafe - Google Patents

Abstract

The present invention relates to a method and apparatus for providing fail safe for a torque sensor.

The present invention provides a signal detecting unit for detecting signal values of a main signal and a sub signal output from a torque sensor; And a controller configured to determine whether the torque sensor is fixed based on signal values of the main signal and the sub-signal, and to control the motor assist based on the determined result.

According to the present invention, there is an effect of improving stability by providing a torque sensor fail safe function capable of determining the stuck state of the torque sensor and controlling the motor assist according to the determination result.

Torque sensor, fixation, motor assist, fail safe

Description

Method and device for providing fail safe for torque sensor {Method and Apparatus for Providing Torque Sensor Failsafe}

The present invention relates to a method and apparatus for providing fail safe for a torque sensor. More specifically, the present invention relates to a method and apparatus for providing fail safe for a torque sensor that improves stability by providing a torque sensor fail safe function capable of determining a stuck state of the torque sensor and controlling motor assist according to the determination result. will be.

In failsafe for the conventional torque sensor, if the output signal of the torque sensor is abnormal, it prevents the motor assist or limits the output, so that the problem of the torque sensor can be detected and stability Can be improved.

However, the main signal and the sub-signal output from the torque sensor move with the same signal value under normal conditions, and the output is fixed at the same voltage (for example, 1.2V) even when the torque sensor is fixed by internal and external influences. Due to the feature, even if the torque sensor is stuck, it does not detect this and determines that it is in a normal state to perform the motor assist.

As such, the conventional torque sensor fail-safe function, which does not detect the steady state and the stuck state of the torque sensor, can quickly rotate the handle to the left / right ends without steering the steering wheel as soon as the driver starts in the fixed state of the torque sensor. Can cause problems that can pose a major threat to the safety of the driver.

In order to solve the above problems, the present invention has a main object to improve the stability by providing a torque sensor fail safe function that can determine the fixed state of the torque sensor and control the motor assist according to the determination result.

In order to achieve the above object, the present invention includes a signal sensing unit for sensing the signal values of the main signal and the sub-signal output from the torque sensor; And a controller configured to determine whether the torque sensor is fixed based on the signal values of the main signal and the sub-signal, and to control a motor assist based on the determined result. Provide a fail safe device.

In addition, the present invention, the signal sensing step of detecting the signal value of the main signal and the sub-signal output from the torque sensor; A torque sensor stuck state determining step of determining whether the torque sensor is stuck based on a signal value of the main signal and the sub-signal; And a motor assist control step of controlling a motor assist based on the determined result.

As described above, the present invention provides an effect of improving stability by providing a torque sensor fail safe function capable of determining a fixed state of the torque sensor and controlling the motor assist according to the determination result.

First, in the failsafe of the conventional torque sensor, if the output signal of the torque sensor is abnormal, by preventing the motor assist or limiting the output, it detects a problem of the torque sensor and responds to it. Stability could be improved, but the main signal and the sub signal output from the torque sensor move with the same signal value under normal conditions, and the same voltage (for example, 1.2V) even when the torque sensor is fixed by internal and external influences. Due to the feature that the output is fixed, even if the torque sensor is stuck, it does not detect this and determines that it is in a normal state to perform the motor assist.

In other words, in the conventional torque sensor fail-safe function, the normal state and the fixed state of the torque sensor are not detected. In the fixed state of the torque sensor, as soon as the driver starts the steering wheel, the steering wheel moves quickly to the left / right end without steering steering. This can cause problems that can rotate and pose a significant threat to the driver's safety.

Accordingly, the present invention relates to determining the stuck state of the torque sensor and controlling the motor assist accordingly. Hereinafter, some embodiments of the present invention will be described in more detail with reference to exemplary drawings.

In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same elements as much as possible even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

1 is a schematic view of a torque sensor failsafe device 100 according to an embodiment of the present invention.

Referring to FIG. 1, a torque sensor fail safe apparatus 100 according to an embodiment of the present invention may include a signal detector configured to detect signal values of a main signal and a sub signal output from a torque sensor 10. 110; And a controller for determining whether the torque sensor 10 is fixed based on the signal values of the main signal and the sub-signals sensed by the signal detection unit 110, and controlling the motor assist based on the determined result. 120 and the like.

The controller 120 may be maintained for a predetermined time because the detected signal value of the main signal or sub-signal is less than a predetermined fixation determination voltage, or the signal value of the detected main signal or sub-signal is changed for a predetermined time. Is not generated or if the detected signal values of the main signal and the sub-signal are different, it may be determined (referred to) that the torque sensor 10 is stuck.

The control unit 120 stops the motor assist, stores the trouble code when it is determined that the torque sensor 10 is in a fixed state according to the above-described method, and stores an electronic control unit (ECU: Electronic). Stop the Control Unit (11).

When the torque sensor fail safe device 100 according to an exemplary embodiment of the present invention determines that the torque sensor 10 is stuck, the corresponding warning light may be turned on to inform the driver of the fact.

However, even if the motor assist is stopped by determining that the torque sensor 10 is in a stuck state according to the present invention, the vehicle may be ignited on in the handle lock state in the parking mode. If the torque output changes, immediately start the motor assist which has been stopped.

2 is a flowchart illustrating a torque sensor fail safe providing method according to an exemplary embodiment of the present invention.

2, the torque sensor fail-safe providing method according to an exemplary embodiment of the present invention includes a signal sensing step (S200) of detecting signal values of a main signal and a sub-signal output from the torque sensor 10; A torque sensor stuck state determination step (S202) of determining whether the torque sensor 10 is stuck based on a signal value of the main signal and the sub-signal; And a motor assist control step S204 for controlling the motor assist based on the determined result.

In the above-described torque sensor fixation state determination step (S202), the fixation state of the torque sensor 10 is determined using the signal values of the main signal and the sub-signals detected in the signal detection step (S200), and the detected main signal Alternatively, the signal value of the sub-signal is less than the predetermined fixation determination voltage and continues for a predetermined time, or the signal value of the detected main signal or sub-signal does not change for a certain time, or the detected main signal and the sub-signal If the signal value is different, it may be determined that the torque sensor 10 is stuck.

In the above-described motor assist control step (S204), if it is determined that the torque sensor 10 is stuck in the preceding torque sensor stuck state determination step (S202), the motor assist is stopped, and the corresponding trouble code is stored. The electronic control unit (ECU) 11 is stopped.

3 is a flowchart illustrating a torque sensor fail safe providing method according to another exemplary embodiment of the present invention.

Referring to FIG. 3, in the torque sensor fail safe providing method according to another embodiment of the present invention, a main signal (TSM) and a sub signal (TSS) output from the torque sensor 10 may be used. In step S302, the controller detects a signal value of S300, and determines whether the detected main signal TSM or the sub-signal TSS is less than a predetermined fixation determination voltage Ref_Level.

As a result of the determination, when the detected main signal TSM or the sub-signal TSS does not fall below the preset fixation determination voltage Ref_Level, the controller 100 determines to be in a normal state so as to perform motor assist. However, when it is determined that the detected main signal TSM or the sub-signal TSS is less than the predetermined fixation determination voltage Ref_Level, the motor assist is stopped and the disabled time is determined. Counting is performed (S304).

As such, when a signal related to the operation of the motor assist is received while counting the stop time (S304), the counting of the stop time is stopped, and the counted stop time until then exceeds a preset predetermined time of 10 minutes. It is determined (S306).

As a result of this determination, if it is determined that the counted down time exceeds 10 minutes, it stores the trouble code (DTC) and turns off the electronic control unit (ECU) system 11. Perform the operation (S308). Meanwhile, if the counted stop time does not exceed 10 minutes because the detected main signal TSM or the sub-signal TSS is equal to or greater than the preset fixation determination voltage Ref_Level, the detected main signal TSM or the sub-signal ( It is determined whether the amount of change of the TSS exceeds zero (S310). That is, since the change amount of the main signal TSM or the sub-signal TSS is greater than zero in the normal torque sensor 10, the normal state and the abnormal state of the torque sensor 10 are determined in S310. .

If it is determined that the change amount of the main signal TSM or the sub-signal TSS exceeds zero in S310, and the torque sensor 10 is in a normal state, the motor assist is performed to perform motor assist (S314). Otherwise, if the change amount of the main signal TSM or the sub signal TSS becomes zero in S310, the torque sensor 10 is determined to be in an abnormal state, and the disable time is reset (Reset, Clear). (S312), and again, the motor assist is stopped (Disable Motor Assist) and the counting the Stop Time (Disable Time) is performed (S304).

As described above, according to the present invention, there is an effect of improving stability by providing a torque sensor fail safe function capable of determining the stuck state of the torque sensor 10 and controlling the motor assist according to the determination result.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing embodiments of the present invention. As the storage medium of the computer program, a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a view schematically showing a torque sensor fail safe device according to an embodiment of the present invention;

2 is a flowchart illustrating a torque sensor fail safe providing method according to an embodiment of the present invention;

3 is a flowchart illustrating a torque sensor fail safe providing method according to another exemplary embodiment of the present invention.

Description of the Related Art

10: torque sensor

11: electronic control unit (ECU)

100: torque sensor fail safe device

110: signal detector

120:

Claims (4)

In torque sensor failsafe devices, A signal detector for detecting signal values of the main signal and the sub signal output from the torque sensor; And When it is determined whether the signal values of the main signal and the sub-signal are equally less than a predetermined fixation determination voltage, and if the signal values of the main signal and the sub-signal are equally less than the fixation determination voltage, the torque sensor is determined. The motor assist stops the motor assist, counts the stop time of the motor assist, and predicts the stop time of the motor assist in anticipation that the output signal values of the main signal and the sub-signal are equally fixed to a specific voltage. When a signal related to the operation of the signal is received, the count of the stop time is stopped and it is determined whether the counted stop time until the stop time exceeds a preset predetermined time, and the counted stop time exceeds the predetermined time. If it is determined that the torque sensor is considered stuck, Save the trouble code and stop the electronic control unit system, and if it is determined that the counted stop time does not exceed the predetermined time, it is determined whether the change amount of the main signal or the sub signal occurs and the change amount does not occur. If it is determined that the torque sensor is in a fixed state is continuously predicted to reset the counted down time and the stop of the motor assist to continue counting again the stop time, if it is determined that the change amount occurs the torque sensor is in a normal state To control motor assist to be performed again Torque sensor fail safe device comprising a. delete delete In a failsafe providing method, Sensing signal values of the main signal and the sub signal output from the torque sensor; Determining whether the signal values of the main signal and the sub-signal are equally less than a predetermined fixation determination voltage; When the signal values of the main signal and the sub-signal are equally less than the fixation determination voltage, the signal values of the main signal and the sub-signal output from the torque sensor are equally fixed to a specific voltage. Anticipating stopping the motor assist and counting a stop time of the motor assist; During the counting of the stop time, when a signal related to the operation of the motor assist is received, stopping the counting of the stop time and determining whether the stop time counted up to the time when the stop time has exceeded a predetermined predetermined time; If it is determined that the counted pause time has exceeded the predetermined time, storing the trouble code and stopping the electronic control unit system by finally considering that the torque sensor is stuck; Determining whether the change amount of the main signal or the sub-signal is generated when it is determined that the counted stop time does not exceed the predetermined time; If it is determined that the amount of change has not occurred, continuously predicting that the torque sensor is in a fixed state, resetting the counted stop time, and counting the stop time again while continuing to stop the motor assist; And If it is determined that the change amount has occurred, controlling the motor assist to be performed again, considering that the torque sensor is in a normal state. Fail-safe providing method for a torque sensor comprising a.

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