KR102583208B1 - Control apparatus for mild hybrid vehicle and method for diagnosing belt failure thereof - Google Patents

Abstract

A control device for a mild hybrid vehicle according to a preferred embodiment of the present invention includes a diagnostic mode determination unit that determines whether the failure diagnosis mode for the belt connecting the engine and the starter generator is operated while the vehicle is running, and a diagnostic mode determination unit that operates in the failure diagnosis mode. In this case, it includes a calculation unit that calculates the average value of the tension of the belt in a power generation situation of the vehicle, and a failure determination unit that determines whether the belt is broken using the average value of the tension of the belt and a preset reference value.

Description

Control device for mild hybrid vehicle and its belt failure diagnosis method {CONTROL APPARATUS FOR MILD HYBRID VEHICLE AND METHOD FOR DIAGNOSING BELT FAILURE THEREOF}

The present invention relates to a control device for a mild hybrid vehicle and a belt failure diagnosis method thereof.

A hybrid electric vehicle uses both an internal combustion engine and battery power. In other words, hybrid vehicles efficiently combine the power of the internal combustion engine and the power of the motor.

Hybrid vehicles can be divided into mild type and hard type depending on the power sharing ratio of the engine and motor.

A mild-type hybrid vehicle (hereinafter referred to as a mild hybrid vehicle) is equipped with a mild hybrid starter & generator (MHSG) that starts the engine or generates power by the output of the engine instead of an alternator.

A hard-type hybrid vehicle is separately equipped with a starter generator that starts the engine or generates power by the output of the engine and a drive motor that drives the vehicle.

Mild hybrid vehicles do not have a driving mode that drives the vehicle with only the torque of the starter generator, but the engine torque can be assisted according to driving conditions by using the starter generator, and the battery (for example, a 48V battery) can be charged through regenerative braking. can do. Accordingly, the fuel efficiency of the mild hybrid vehicle can be improved.

Mild hybrid vehicles are equipped with a belt that connects the engine and the starter generator, and the belt is used for the purpose of organic power transmission between parts connected to the engine. Additionally, mild hybrid vehicles require smooth interlocking that the driver cannot perceive when starting the vehicle after turning off the engine while coasting.

Therefore, in a mild hybrid vehicle, it is necessary to detect a failure of the belt connecting the engine and the starter generator and maintain the tension of the belt optimally.

Republic of Korea Patent Publication No. 10-2018-0050996

Accordingly, the present invention was developed in consideration of the above-mentioned circumstances. By calculating the tension of the belt and periodically checking the belt in consideration of the operating state of the starter generator while the vehicle is running, the present invention prevents vehicle accidents due to belt failure in advance. The purpose is to provide a control device for a mild hybrid vehicle that improves reliability and stability of the vehicle and a method for diagnosing its belt failure.

A control device for a mild hybrid vehicle according to a preferred embodiment of the present invention for achieving the above object includes a diagnostic mode determination unit that determines whether a failure diagnosis mode is operated for a belt connecting the engine and the starter generator while the vehicle is running; When operating in the failure diagnosis mode, a calculation unit that calculates an average value of the tension of the belt in a coasting power generation situation of the vehicle; and a failure determination unit that determines whether the belt is broken using an average value of the tension of the belt and a preset reference value.

The diagnostic mode determination unit may compare the driving distance of the vehicle with a preset threshold distance, and if the driving distance is greater than or equal to the threshold distance according to the comparison result, it may be determined that a malfunction diagnosis of the belt is necessary.

When the driving distance is greater than or equal to the threshold distance, the diagnostic mode determination unit may check the torque and RPM values of the engine and whether or not the starter generator is in assist operation.

The diagnostic mode determination unit may operate in the failure diagnosis mode when the torque of the engine is greater than or equal to a preset reference torque, the RPM value is greater than or equal to the preset reference RPM, and assist operation of the starter generator is confirmed.

When operating in the failure diagnosis mode, the calculation unit may calculate an average value of the tension of the belt using dynamics values including the moment of inertia, acceleration, and torque of the starter generator.

When operating in the failure diagnosis mode, the failure determination unit may generate a target torque for the belt diagnosis and compensate the torque of the engine by considering a difference between the target torque for the belt diagnosis and the target torque according to the power generation.

The failure determination unit may calculate a difference between the reference value and the hysteresis value considering the error range, compare the difference with an average value of tension of the belt, and determine whether the belt is broken according to the comparison result.

The failure determination unit may perform a count to increase the count value if the difference value is greater than or equal to the average value of the tension of the belt, and may determine that the belt has failed if the count value is greater than or equal to a preset failure count.

If it is determined that the belt is broken, the failure determination unit may limit and set the torque of the starter generator to a minimum torque.

The belt failure diagnosis method of the control device of a mild hybrid vehicle according to a preferred embodiment of the present invention for achieving the above object is a diagnostic method for determining whether the failure diagnosis mode is operated for the belt connecting the engine and the starter generator while the vehicle is running. mode judgment step; When operating in the failure diagnosis mode, an average value calculation step of calculating an average value of the tension of the belt in a coasting power generation situation of the vehicle; and a failure determination step of determining whether the belt is broken using an average value of the tension of the belt and a preset reference value.

Before the diagnostic mode determination step, a driving distance determination step of comparing the driving distance of the vehicle with a preset threshold distance and determining that a failure diagnosis of the belt is necessary if the driving distance is greater than or equal to the threshold distance as a result of the comparison. It can be included.

The diagnostic mode determination step may include checking the torque and RPM value of the engine and whether the starter generator is in assist operation when the driving distance is greater than or equal to the threshold distance.

The diagnosis mode determination step includes operating in the failure diagnosis mode when the torque of the engine is greater than or equal to a preset reference torque, the RPM value is greater than or equal to the preset reference RPM, and assist operation of the starter generator is confirmed. More may be included.

In the average value calculation step, when operating in the fault diagnosis mode, the average value of the tension of the belt may be calculated using dynamics values including the moment of inertia, acceleration, and torque of the starter generator.

The average value calculation step includes generating a target torque for the belt diagnosis when operating in the failure diagnosis mode, and compensating the torque of the engine by considering the difference between the target torque for the belt diagnosis and the target torque according to the power generation. It can be included.

In the failure determination step, the difference between the reference value and the hysteresis value considering the error range is calculated, the difference is compared with the average value of the tension of the belt, and it can be determined whether the belt is broken according to the comparison result. .

After the failure determination step, a count step of performing a count to increase the count value if the difference value is greater than or equal to an average value of tension of the belt; and a count determination step of determining that the belt has failed when the preset count value is greater than or equal to a preset failure count.

If it is determined that the belt is broken after the count determination step, a torque limiting step of limiting the torque of the starter generator to a minimum torque may be included.

According to the control device for a mild hybrid vehicle and its belt failure diagnosis method according to a preferred embodiment of the present invention, the belt tension is calculated by considering the operating state of the starter generator in the vehicle's driving state and the belt is periodically inspected. It has the effect of improving the reliability and stability of vehicles by preventing vehicle accidents due to breakdowns.

In addition, the belt protection mode is activated until the belt is replaced to limit the motor torque, thereby reducing the force applied to the belt and extending the life of the belt.

Figure 1 is a diagram for explaining the system configuration of a mild hybrid vehicle.
Figure 2 is a block diagram of a control device for a mild hybrid vehicle according to a preferred embodiment of the present invention.
Figure 3 is a diagram for explaining belt tension according to the rotation direction of the engine and the starter generator.
Figure 4 is a diagram showing the torque of the engine and starter generator for each driving situation of a mild hybrid vehicle.
Figure 5 is a flow chart of a belt failure diagnosis method of a control device for a mild hybrid vehicle according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. First, when adding reference signs to components in each drawing, it should be noted that the same components are given the same reference numerals as much as possible even if they are shown in different drawings. In addition, preferred embodiments of the present invention will be described below, but the technical idea of the present invention is not limited or restricted thereto, and of course, it can be modified and implemented in various ways by those skilled in the art.

Figure 1 is a diagram for explaining the system configuration of a mild hybrid vehicle.

Referring to FIG. 1, the mild hybrid vehicle 100 includes a control device 110, an engine 120, a starter generator 130, a battery 140, a belt drive system 150, and a super charger 160. Includes. The mild hybrid vehicle 100 includes various components in addition to those described above, but these are omitted from the description of the present invention.

The control device 110 calculates the tension of the belt of the belt drive system 150 in consideration of the operating state (dynamics) of the starter generator 130 in the vehicle's driving state and periodically checks the belt to prevent vehicle accidents due to belt failure. It is characterized by improving the reliability and stability of the vehicle by preventing it in advance.

The engine 120 converts chemical energy into mechanical energy by burning fuel and air. The engine 120 may include a plurality of combustion chambers into which fuel and air flow, an ignition device that ignites the fuel and air introduced into the combustion chamber, and an injector that injects fuel. The engine 120 is connected to an intake manifold so that air can flow into the combustion chamber. Exhaust gas generated during the combustion process of the engine 120 is collected in the exhaust manifold and then discharged outside the engine. The injector may be mounted within the combustion chamber or on the intake manifold.

The engine 120 transmits the power of the vehicle by inputting torque to the input shaft of the transmission. The torque output from the output shaft of the transmission is transmitted to the axle via a differential gear device. As the axle rotates the wheel, the mild hybrid vehicle 100 can travel by the torque of the engine 120.

The starter generator 130 may be a type of MHSG (Mild Hybrid Starter & Generator) motor device. The starter generator 130 converts electrical energy into mechanical energy or mechanical energy into electrical energy. That is, the starting power generation 130 may be generated by starting the engine 120 or by the output of the engine 120. Additionally, the starting power generation 130 may assist the torque of the engine 120. The mild hybrid vehicle 100 can use the combustion torque of the engine 120 as its main power and use the torque of the starter generator 130 as auxiliary power. The engine 120 and the starter generator 130 may be connected through a belt drive system 150.

The battery 140 may supply electricity to the starter generator 130 or may be charged through electricity recovered through the starter generator 130 in a regenerative braking mode. Battery 140 may be a 48V battery. The mild hybrid vehicle 100 may further include a low voltage DC-DC converter (LDC) that converts the voltage supplied from the battery 140 into low voltage and a 12V battery that supplies low voltage to an electric load that uses low voltage.

The belt drive system 150 may include a pair of pulleys connected to the engine 120 and the starter generator 130 and a belt connecting the pulleys. The belt drive system 150 may transmit the power of the engine 120 to the starter generator 130 using the friction force of the belt and pulley, or may transmit the power of the starter generator 130 to the engine 120. The belt drive system 150 may be equipped with a tensioner that maintains positive belt tension to prevent the belt from loosening during high-speed driving.

The super charger 160 may be a type of electric super charger (e-SC) that is driven by power from the battery 140 to supply air to the engine 120. The supercharger 160 may be driven to compensate for the torque of the engine 120 when a failure of the belt drive system 150 is diagnosed.

Figure 2 is a block diagram of a control device for a mild hybrid vehicle according to a preferred embodiment of the present invention.

Referring to Figures 1 and 2, the control device 110 of a mild hybrid vehicle according to a preferred embodiment of the present invention calculates the tension of the belt by considering the operating state (dynamics) of the starter generator in the driving state of the vehicle. By periodically checking the belt, vehicle accidents due to belt failure are prevented in advance and the reliability and stability of the vehicle are improved.

The control device 110 for a mild hybrid vehicle according to a preferred embodiment of the present invention may include an input unit 111, a diagnostic mode determination unit 113, a calculation unit 115, and a failure determination unit 117. .

The input unit 111 can receive various information about the vehicle. The input unit 111 may receive driving distance information from the vehicle's odometer. Mileage information can be used as a parameter to determine whether to enter a diagnostic mode for belt diagnosis.

The input unit 111 may receive torque of the starting generator 130 from a motor sensor. The input unit 111 may receive an input of the moment of inertia, which is a constant according to the specifications of the starting generator 130, from the user. The input unit 111 may receive the acceleration of the starter generator 130 from an acceleration sensor. The input unit 111 may receive RPM (Rotation Per Minute) of the engine 120 from the engine sensor. The torque, moment of inertia, acceleration, or RPM of the engine 120 of the starter generator 130 as described above may be used to calculate the dynamics value of the starter generator 130. The dynamics value of the starter generator 130 can be used to calculate a reference value used to diagnose belt failure.

The dynamics value of the starter generator 130 can be expressed as Equation 1 below.

<Equation 1>

은 시동 발전기(130)의 스펙에 따른 상수인 관성 모멘트를 나타낼 수 있다.

는 시동 발전기(130)의 가속도를 나타낼 수 있다. 여기서, 시동 발전기(130)의 가속도에 필요한 모터 속도는 엔진(120)의 RPM을 통해 계산될 수 있다. 모터 속도는 엔진(120)의 속도에 벨트 구동 시스템(150)의 풀리비를 곱하여 계산될 수 있다.In equation 1,

may represent the moment of inertia, which is a constant according to the specifications of the starting generator 130.

may represent the acceleration of the starter generator 130. Here, the motor speed required for acceleration of the starter generator 130 may be calculated through the RPM of the engine 120. Motor speed can be calculated by multiplying the speed of the engine 120 by the pulley ratio of the belt drive system 150.

은 모터 토크를 나타낼 수 있다.

은 벨트 장력(F_belt)과 폴리 유효 반지름(r_pully)의 곱셈으로 계산될 수 있다.

may represent the motor torque.

can be calculated by multiplying the belt tension (F_belt) and the pulley effective radius (r_pully).

The diagnostic mode determination unit 113 may compare driving distance information and a preset threshold distance while the vehicle is driving. The diagnosis mode determination unit 113 may determine that diagnosis of a belt failure of the belt drive system 150 is necessary when the driving distance information is greater than or equal to a threshold distance. At this time, the diagnosis mode determination unit 113 may request operation in the failure diagnosis mode.

On the other hand, it is easier to confirm belt failure when the belt tension is strong than when the tension is weak. Accordingly, a situation in which strong tension is applied to the belt while the vehicle is running may be a situation in which the torque of the engine 120 and the starter generator 130 are opposite. In addition, in order to enter the assist mode that uses the torque of the starter generator 130 as auxiliary power, the driver's required torque must be high because the starter generator 130 assists the torque to satisfy the user's required torque.

Accordingly, the diagnostic mode determination unit 113 can check the torque and RPM values of the engine 120 and whether the starter generator 130 is in the assist mode before operating in the belt failure diagnosis mode. The diagnostic mode determination unit 113 may determine the torque assist mode when the torque of the starter generator 130 has the same positive direction as the torque of the engine 120.

On the other hand, since the tensioner is used to maintain a certain degree of constant belt tension, there is no significant effect in situations where the belt tension is intentionally strong. The belt failure diagnosis mode is a situation in which the tensioner is operating while the vehicle is traveling at high speed, and the tensioner operation is reflected in the reference value, so the tensioner operation is not greatly considered in belt failure diagnosis.

The calculation unit 115 may calculate a reference value used to diagnose a belt failure of the belt drive system 150 in normal times. The calculation unit 115 may calculate the average value of the belt tension Tl using the dynamics value of the starter generator 130 in a coast regen situation as the vehicle coasts. The average value of belt tension (Tl) may be defined as a reference value.

Here, in order to generate a reference value in the same situation as when diagnosing a belt failure, a negative torque must be requested as the target torque. Additionally, in response to the increasing negative torque, the torque of the engine 120 is increased using the supercharger 160 so that the total torque sum is not affected. The reason for increasing the torque of the engine 120 using the supercharger 160 is to quickly increase the torque of the engine 120 in a situation where there is no user-required torque.

When operating in the belt failure diagnosis mode, the failure determination unit 117 calculates the belt tension Tl in the coasting power generation mode in which the starter generator 130 generates negative torque, so the engine 120 is in an idle state. When , a target torque value for belt failure diagnosis can be generated. At this time, even if the target torque value is input, the coasting power generation mode has not yet been entered, so the target torque is not input to the starting generator 130.

If the starter generator 130 outputs a negative torque greater than the existing target charge value, a strange feeling such as a sudden decrease in vehicle speed may occur, which may affect vehicle drivability.

Accordingly, the failure determination unit 117 may drive the supercharger 160 to compensate for the difference between the target torque for belt diagnosis and the target torque due to existing coasting power generation with the torque of the engine 120. That is, the failure determination unit 117 increases the torque of the engine 120 using the supercharger 160 so that the total torque amount remains unchanged. This does not affect the drivability of the vehicle.

When operating in the belt failure diagnosis mode, the calculation unit 115 may calculate the average value of the belt tension (Tl) for a specific time according to the coasting power generation mode. Here, the reason why belt failure diagnosis is performed in the coasting power generation mode is because the power generation mode is when the starter generator 130 continues to produce negative torque. That is, although the torque of the starter generator 130 may have a negative value while the vehicle is running, the torque of the starter generator 130 is not constant and continuously changes in order to reduce the torque of the engine 120.

In addition, since the target torque of the starter generator 130 in coasting power generation mode changes depending on the vehicle speed and gear number, the failure determination unit 117 maintains a constant torque to minimize the impact on drivability when diagnosing a belt failure. The starting generator 130 can be driven with a fixed target torque to output. The failure determination unit 117 may compensate for the difference between the target torque for diagnosing a belt failure and the target torque due to coasting force development with the torque of the engine 120.

The failure determination unit 117 may determine whether the belt tension is abnormal using the reference value (T_ref) calculated by the calculation unit 115. The failure determination unit 117 may additionally consider a hysteresis value to consider the error range.

The failure determination unit 117 may compare the difference between the reference value and the hysteresis value with the average value of the belt tension. If the difference value is less than the average value, the failure determination unit 117 may determine that the belt tension is normal. When the failure determination unit 117 determines that the belt tension is normal, it may end the belt failure diagnosis mode and initialize parameters related to the failure diagnosis. At this time, the failure determination unit 117 can maintain the reference value and reset the reference value when the belt is replaced. Additionally, the failure determination unit 117 may initialize the reference value when it is determined that the belt is under maintenance and the warning light is turned off.

If the difference between the reference value and the hysteresis value is greater than or equal to the average value, the failure determination unit 117 may determine that the belt tension Tl is in a failure state. The failure determination unit 117 may perform a count when determining the failure status of the belt tension Tl. The failure determination unit 117 may determine that the final belt has failed if the count is greater than a certain count (failure count). The failure count can be set appropriately according to the user's needs.

When it is finally determined that the belt tension Tl is in a failure state, the failure determination unit 117 may output a belt failure notification so that the user can be notified.

The failure determination unit 117 may operate the belt protection mode to prevent the belt from deteriorating further due to excessive tension being applied to the belt.

When operating in the belt protection mode, the failure determination unit 117 may drive the starter generator 130 with minimum torque to prevent large tension from being applied to the belt.

Figure 3 is a diagram for explaining belt tension according to the rotation direction of the engine and the starter generator.

Figure 3(a) shows a situation where the tension of the belt increases as the engine 120 rotates. The failure determination unit 117 can easily determine belt failure when the belt tension increases.

Figure 3(b) shows a situation where the tension of the belt increases as the starter generator 130 rotates. At this time, the starter generator 130 rotates to start the engine 120 after the vehicle stops.

Figure 3(c) shows a situation where the tension of the belt increases as the engine 120 and the starter generator 130 rotate. At this time, while the vehicle is running, the rotation direction of the engine 120 and the starter generator 130 are the same and the torque direction is opposite.

Figure 4 is a diagram showing the torque of the engine and starter generator for each driving situation of a mild hybrid vehicle.

Referring to FIG. 4 , the mild hybrid vehicle 100 may be driven including a driver acceleration situation, a coasting regen situation, and a belt diagnosis situation.

In a driver acceleration situation, the driver's requested torque, the torque of the engine 120, and the torque of the starter generator 130 according to the assist mode may have positive torque values. The total torque of the engine 120 and the starting generator 130 may have a positive torque value.

In a coasting regen situation, the driver's required torque may have a torque value of 0. Additionally, the torque of the engine 120 may have a positive torque value. Additionally, the torque of the starter generator 130 according to the assist mode may have a negative torque value. Additionally, the total torque of the engine 120 and the starting generator 130 may have a negative torque value.

In a belt diagnosis situation, the driver's required torque may have a torque value of 0. Additionally, the torque of the engine 120 may have a positive torque value. Additionally, the torque of the starter generator 130 according to the assist mode may have a negative torque value. Additionally, the total torque of the engine 120 and the starting generator 130 may have a negative torque value. At this time, in order to diagnose belt failure, the torque of the engine 120 is increased by the increased torque of the starter generator 130, so there is no change in the total torque.

Figure 5 is a flow chart of a belt failure diagnosis method of a control device for a mild hybrid vehicle according to a preferred embodiment of the present invention.

Referring to FIGS. 1, 2, and 5, the belt failure diagnosis method of the control device of a mild hybrid vehicle according to a preferred embodiment of the present invention is based on the operating state (dynamics) of the starter generator 130 in the driving state of the vehicle. By calculating the tension of the belt and periodically inspecting the belt, vehicle accidents due to belt failure are prevented in advance, thereby improving reliability and stability of the vehicle.

In the driving distance determination step (S510), the diagnostic mode determination unit 113 may compare the driving distance while the vehicle is driving with a preset threshold distance (Thd). The diagnosis mode determination unit 113 may determine that diagnosis of a belt failure of the belt drive system 150 is necessary when the vehicle's driving distance is greater than or equal to a critical distance. The diagnosis mode determination unit 113 may determine that diagnosis of a belt failure of the belt drive system 150 is not necessary when the driving distance of the vehicle is less than the critical distance.

In the reference value calculation step (S520), if it is determined that belt failure diagnosis is not necessary, the calculation unit 115 calculates a reference value used to determine belt failure using the dynamics value of the starter generator 130. can do.

In the diagnosis mode request step (S530), if it is determined that belt failure diagnosis is necessary, the diagnosis mode determination unit 113 may request operation in the failure diagnosis mode.

In the diagnosis mode determination step (S540), the diagnosis mode determination unit 113 determines the torque (Eng. TQ) and RPM value (Eng. RPM) of the engine 120 and the starter generator (130) before operating in the belt failure diagnosis mode. ) can be checked to see whether it is in assist mode. The diagnostic mode determination unit 113 may determine the torque assist mode when the torque of the starter generator 130 has the same positive direction as the torque of the engine 120. The diagnostic mode determination unit 113 determines that the torque (Eng. TQ) of the engine 12 is more than the reference torque (THD), the RPM value (Eng. RPM) is more than the reference RPM (THD), and the torque assist mode is in operation. If it is determined that it is, it can operate in belt failure diagnosis mode.

In the average value calculation step (S550), when operating in the belt failure diagnosis mode, the failure determination unit 117 may generate a target torque value for belt failure diagnosis when the engine 120 is in an idle state. The failure determination unit 117 may drive the supercharger 160 to compensate for the difference between the target torque for belt diagnosis and the target torque due to existing coasting power generation with the torque of the engine 120. When operating in the belt failure diagnosis mode, the calculation unit 115 may calculate the average value of the belt tension (Tl) for a specific time using the dynamics value of the starter generator 130 according to the coasting power generation mode.

In the failure determination step (S560), the failure determination unit 117 may compare the difference between the reference value (T_ref) and the hysteresis value (hyst) with the average value of the belt tension (Tl).

In the mode ending step (S570), the failure determination unit 117 may determine that the belt tension is normal if the difference value is less than the average value. When the failure determination unit 117 determines that the belt tension is normal, it may end the belt failure diagnosis mode and initialize parameters related to the failure diagnosis.

In the count step (S580), the failure determination unit 117 may perform a count when the difference between the reference value and the hysteresis value is greater than or equal to the average value.

In the count determination step (S590), the failure determination unit 117 may compare the count with a preset specific count (failure count). The failure determination unit 117 may determine that the final belt has failed if the count is greater than or equal to the failure count. The failure count can be set appropriately according to the user's needs.

In the failure notification step (S600), if it is finally determined that the belt tension Tl is in a failure state, the failure determination unit 117 may output a belt failure notification so that the user can be notified.

In the protection mode operation step (S610), the failure determination unit 117 may operate the belt protection mode to prevent further deterioration due to excessive tension on the belt.

In the torque limiting step (S620), the failure determination unit 117 may drive the starter generator 130 with a minimum torque when operating in the belt protection mode to prevent a large tension from being applied to the belt.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications, changes, and substitutions can be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the attached drawings are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments and the attached drawings. .

Steps and/or operations according to the invention may occur simultaneously in different embodiments, in different orders, in parallel, for different epochs, etc., as would be understood by those skilled in the art. You can.

Depending on the embodiment, some or all of the steps and/or operations may include executing instructions, programs, interactive data structures, clients and/or servers stored on one or more non-transitory computer-readable media. At least a portion may be implemented or performed using one or more processors. The one or more non-transitory computer-readable media may illustratively be software, firmware, hardware, and/or any combination thereof. Additionally, the functionality of the “modules” discussed herein may be implemented in software, firmware, hardware, and/or any combination thereof.

100: Mild hybrid vehicle
110: control device
111: input unit
113: Diagnostic mode determination unit
115: Calculation unit
117: Failure determination unit
120: engine
130: Starter generator
140: battery
150: Belt drive system
160: Supercharger

Claims (18)

A diagnostic mode determination unit that determines whether a failure diagnosis mode is operated for the belt connecting the engine and the starter generator while the vehicle is running;
When operating in the failure diagnosis mode, a calculation unit that calculates an average value of the tension of the belt in a coasting power generation situation of the vehicle; and
a failure determination unit that determines whether the belt is broken using an average value of the tension of the belt and a preset reference value;
A control device for a mild hybrid vehicle comprising a. According to claim 1,
The diagnostic mode determination unit,
A control device for a mild hybrid vehicle, characterized in that: comparing the driving distance of the vehicle with a preset threshold distance, and determining that a failure diagnosis of the belt is necessary when the driving distance is greater than or equal to the threshold distance according to the comparison result. According to claim 2,
The diagnostic mode determination unit,
A control device for a mild hybrid vehicle, characterized in that it checks the torque and RPM value of the engine and whether or not the assist operation of the starter generator is performed when the driving distance is greater than or equal to the threshold distance. According to claim 3,
The diagnostic mode determination unit,
Control of a mild hybrid vehicle, characterized in that it operates in the failure diagnosis mode when the torque of the engine is more than a preset reference torque, the RPM value is more than a preset reference RPM, and assist operation of the starter generator is confirmed. Device. According to claim 1,
The calculation unit,
A control device for a mild hybrid vehicle, characterized in that, when operating in the fault diagnosis mode, the average value of the tension of the belt is calculated using dynamics values including the moment of inertia, acceleration, and torque of the starter generator. According to claim 5,
The failure determination unit,
When operating in the failure diagnosis mode, the target torque for the belt diagnosis is generated, and the torque of the engine is compensated by considering the difference between the target torque for the belt diagnosis and the target torque according to the power generation. controller. According to claim 6,
The failure determination unit,
A control device for a mild hybrid vehicle, characterized in that the reference value is determined in consideration of the error range, the determined reference value is compared with an average value of the tension of the belt, and the control device determines whether the belt is broken according to the comparison result. According to claim 7,
The failure determination unit,
If the determined reference value is greater than or equal to the average value of the tension of the belt, a count is performed to increase the count value, and if the count value is greater than or equal to a preset failure count, the control of the mild hybrid vehicle is characterized in that it is determined that the belt has failed. Device. According to claim 8,
The failure determination unit,
A control device for a mild hybrid vehicle, characterized in that when it is determined that the belt is broken, the torque of the starter generator is limited to a minimum torque. A diagnosis mode determination step of determining whether a failure diagnosis mode is operated for a belt connecting the engine and the starter generator while the vehicle is running;
When operating in the failure diagnosis mode, an average value calculation step of calculating an average value of the tension of the belt in a coasting power generation situation of the vehicle; and
A failure determination step of determining whether the belt is broken using an average value of the tension of the belt and a preset reference value;
A belt failure diagnosis method of a control device of a mild hybrid vehicle comprising a. According to claim 10,
Before the diagnostic mode determination step, a driving distance determination step of comparing the driving distance of the vehicle with a preset threshold distance and determining that a malfunction diagnosis of the belt is necessary if the driving distance is greater than or equal to the threshold distance as a result of the comparison;
A method for diagnosing belt failure in a control device of a mild hybrid vehicle, further comprising: According to claim 11,
The diagnostic mode determination step is,
A belt failure diagnosis method for a control device of a mild hybrid vehicle, comprising the step of checking the torque and RPM value of the engine and whether or not the assist operation of the starter generator is performed when the driving distance is greater than or equal to the threshold distance. According to claim 12,
The diagnostic mode determination step is,
When the torque of the engine is more than a preset reference torque, the RPM value is more than a preset reference RPM, and assist operation of the starter generator is confirmed, the step of operating in the failure diagnosis mode. Method for diagnosing belt failure in the control unit of a mild hybrid vehicle. According to claim 10,
The average value calculation step is,
Belt failure diagnosis of the control device of a mild hybrid vehicle, characterized in that when operating in the failure diagnosis mode, the average value of the tension of the belt is calculated using dynamics values including the moment of inertia, acceleration, and torque of the starter generator. method. According to claim 14,
The average value calculation step is,
When operating in the failure diagnosis mode, generating a target torque for the belt diagnosis, and compensating the torque of the engine by considering the difference between the target torque for the belt diagnosis and the target torque according to the power generation. Method for diagnosing belt failure in the control unit of a mild hybrid vehicle. According to claim 15,
The failure determination step is,
Belt of the control device of a mild hybrid vehicle, characterized in that the reference value is determined considering the error range, the determined reference value is compared with the average value of the tension of the belt, and whether the belt is broken is determined according to the comparison result. Fault diagnosis method. According to claim 16,
After the failure determination step, a count step of performing a count to increase the count value if the determined reference value is greater than or equal to an average value of tension of the belt; and
A count determination step of determining that the belt has failed when the count value is greater than or equal to a preset failure count;
A method for diagnosing belt failure in a control device of a mild hybrid vehicle, further comprising: According to claim 17,
If it is determined that the belt is broken after the count determination step, a torque limiting step of limiting the torque of the starter generator to a minimum torque;
A method for diagnosing belt failure in a control device of a mild hybrid vehicle, further comprising:

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