KR20230104328A - Control apparatus for mild hybrid vehicle and method for diagnosing belt failure thereof - Google Patents

Abstract

A control apparatus for a mild hybrid vehicle according to a preferred embodiment of the present invention includes a diagnosis mode determining unit for determining whether a belt connecting an engine and a starter generator operates in a fault diagnosis mode while the vehicle is running, and a device operating in the fault diagnosis mode. In this case, a calculation unit for calculating an average value of the tension of the belt in the inertia power generation situation of the vehicle, and a failure determination unit for determining whether the belt is out of order using the average value of the belt tension and a preset reference value.

Description

Control device of mild hybrid vehicle and method for diagnosing its belt failure

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

Hybrid electric vehicles use both an internal combustion engine and battery power. That is, the hybrid vehicle efficiently combines and uses the power of the internal combustion engine and the power of the motor.

A hybrid vehicle may be classified into a mild type and a hard type according to a power sharing ratio between an engine and a motor.

A mild hybrid vehicle (hereinafter, referred to as a mild hybrid vehicle) includes a mild hybrid starter & generator (MHSG) that starts an engine instead of an alternator or generates power based on the output of the engine.

A hybrid vehicle of the hard type includes a starter generator that starts an engine or generates power by 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 only with the torque of the starter generator, but the engine torque can be assisted according to the driving condition using the starter generator, and the battery (e.g., 48V battery) is charged through regenerative braking. can do. Accordingly, fuel efficiency of the mild hybrid vehicle may be improved.

A mild hybrid vehicle is equipped with a belt connecting an engine and a starter generator, and the belt is used for organic power transmission between the engine and connected parts. In addition, in a mild hybrid vehicle, when the engine is turned off during coasting driving and then started, a smooth linkage that the driver cannot recognize is required.

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

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

Accordingly, the present invention has been made in view of the above circumstances, and calculates the tension of the belt in consideration of the operating state of the starter generator in the driving state of the vehicle and periodically checks the belt to prevent vehicle accidents due to belt failure in advance. An object of the present invention is to provide a control device for a mild hybrid vehicle that improves reliability and stability of the vehicle and a method for diagnosing a belt failure thereof.

In order to achieve the above object, a control apparatus for a mild hybrid vehicle according to a preferred embodiment of the present invention includes a diagnosis mode determining unit for determining whether a fault diagnosis mode for a belt connecting an engine and a starter generator is operating while the vehicle is running; a calculation unit calculating an average value of tension of the belt in a state of coasting power generation of the vehicle when operating in the failure diagnosis mode; and a failure determining unit for determining whether the belt has failed using an average value of the tension of the belt and a preset reference value.

The diagnosis mode determiner may compare the driving distance of the vehicle with a predetermined threshold distance, and determine that the belt failure diagnosis is required when the driving distance is greater than or equal to the threshold distance according to the comparison result.

The diagnosis mode determiner may check torque and RPM values of the engine and whether the starter generator assists when the driving distance is equal to or greater than the critical distance.

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

The calculation unit may calculate an average value of tension of the belt using a dynamics value including a moment of inertia, acceleration, and torque of the starter generator when operating in the fault diagnosis mode.

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

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

The failure determination unit may perform a count of increasing a count value when the difference value is equal to or greater than the average value of the tension of the belt, and may determine that the belt failure occurs when the count value is equal to or greater than a preset failure count.

The failure determination unit may limit the torque of the starter generator to a minimum torque when it is determined that the belt is out of order.

A method for diagnosing a belt failure of a control device of a mild hybrid vehicle according to a preferred embodiment of the present invention for achieving the above object is a diagnosis method for determining whether a failure diagnosis mode is operating for a belt connecting an engine and a starter generator while the vehicle is running. mode judgment step; an average value calculation step of calculating an average value of the tension of the belt in a state of coasting power generation of the vehicle when operating in the failure diagnosis mode; and a failure determination step of determining whether or not the belt has failed using an average value of the tension of the belt and a preset reference value.

Prior to the diagnosis mode determining step, a mileage determining step of comparing the mileage of the vehicle with a preset threshold distance and determining that the belt failure diagnosis is necessary when the mileage is equal to or greater than the threshold distance as a result of the comparison; can include

The determining of the diagnostic mode may include checking torque and RPM values of the engine and whether the starter generator operates when the driving distance is equal to or greater than the threshold distance.

The diagnosis mode determining step includes operating in the fault diagnosis mode when the torque of the engine is greater than or equal to a predetermined reference torque, the RPM value is greater than or equal to a predetermined reference RPM, and the assist operation of the starter generator is confirmed. can include more.

In the calculating the average value, the average value of the tension of the belt may be calculated using a dynamics value including a moment of inertia, acceleration, and torque of the starter generator when operating in the failure diagnosis mode.

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

In the failure determination step, a difference value between a hysteresis value considering an error range and a reference value is calculated, and the difference value is compared with an average value of the tension of the belt to determine whether the belt is out of order according to the comparison result. .

a count step of performing a count of increasing a count value when the difference value is equal to or greater than the average value of the tension of the belt after the failure determination step; and a count determination step of determining that the belt is out of order when the previous count value is greater than or equal to a preset failure count.

The method may further include a torque limiting step of limiting and setting the torque of the starter generator to a minimum torque when it is determined that the belt is out of order after the count determining step.

According to a control device for a mild hybrid vehicle and a method for diagnosing a belt failure thereof according to a preferred embodiment of the present invention, the tension of a belt is calculated in consideration of the operation state of a starter generator in a driving state of the vehicle and the belt is checked periodically. There is an effect of improving reliability and stability of a vehicle by preventing a vehicle accident due to a breakdown in advance.

In addition, by operating the belt protection mode until the belt is replaced to limit the motor torque, there is an effect of reducing the force applied to the belt and extending the life of the belt.

1 is a diagram for explaining the system configuration of a mild hybrid vehicle.
2 is a block diagram of a control device for a mild hybrid vehicle according to a preferred embodiment of the present invention.
3 is a diagram for explaining belt tension according to rotational directions of an engine and a starter generator.
4 is a diagram showing torque of an engine and a starter generator for each driving situation of a mild hybrid vehicle.
5 is a flowchart of a method for diagnosing a belt failure in a control device of 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 accompanying drawings. First, in adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, although preferred embodiments of the present invention will be described below, the technical idea of the present invention is not limited or limited thereto and can be modified and implemented in various ways by those skilled in the art.

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

Referring to FIG. 1 , a 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. include The mild hybrid vehicle 100 includes more various components in addition to the above-described components, but they 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 driving state of the vehicle, and periodically checks the belt, thereby causing a vehicle accident due to a belt failure. It is characterized in that the reliability and stability of the vehicle are improved by preventing 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 are introduced, an ignition device that ignites the fuel and air introduced into the combustion chambers, and an injector that injects fuel. The engine 120 may be connected to an intake manifold so that air may be introduced into the combustion chamber. Exhaust gas generated during the combustion process of the engine 120 is collected in the exhaust manifold and then discharged to the outside of the engine. The injector can be mounted in the combustion chamber or on the intake manifold.

The engine 120 transmits 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 the differential gear unit. As the axle rotates the wheels, the mild hybrid vehicle 100 can travel by the torque of the engine 120 .

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

The battery 140 may supply electricity to the starter generator 130 or be charged with 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) converting the voltage supplied from the battery 140 into a low voltage and a 12V battery supplying the low voltage to electric loads using the low voltage.

The belt driving 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 power of the engine 120 to the starter generator 130 or transmit power of the starter generator 130 to the engine 120 using frictional force between the belt and the pulley. The belt driving system 150 may include a tensioner that properly maintains the positive tension of the belt to prevent the belt from loosening during high-speed driving.

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

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 FIGS. 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 in consideration of the operating state (dynamics) of the starter generator in the driving state of the vehicle and By periodically checking the belt, it is characterized in that vehicle accidents due to belt failure are prevented in advance to improve reliability and stability of the vehicle.

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 diagnosis mode determination unit 113, a calculation unit 115, and a failure determination unit 117. .

The input unit 111 may receive various types of vehicle information. The input unit 111 may receive mileage information from an odometer of the vehicle. The mileage information may be used as a parameter for determining whether to enter a diagnosis mode for diagnosing a belt.

The input unit 111 may receive torque of the starter generator 130 from a motor sensor. The input unit 111 may receive a moment of inertia that is a constant according to specifications of the starter 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 an engine sensor. The above-described torque, moment of inertia, acceleration of the starter generator 130, or RPM of the engine 120 may be used to calculate the dynamics value of the starter generator 130. The dynamics value of the starter generator 130 may be used to calculate a reference value used for diagnosing a belt failure.

The dynamics value of the starter generator 130 can be expressed as in 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 a moment of inertia that is a constant according to the specifications of the starter 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 RPM of the engine 120 . Motor speed may be calculated by multiplying the speed of engine 120 by the pulley ratio of 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 motor torque.

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

The diagnosis mode determiner 113 may compare travel distance information with a preset threshold distance while the vehicle is driving. The diagnosis mode determining unit 113 may determine that a belt failure diagnosis of the belt driving system 150 is necessary when the mileage information is greater than or equal to a critical 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 identify belt failure when the belt tension is stronger than when the belt tension is weak. Accordingly, a situation in which a strong tension is applied to the belt while driving the vehicle may be a situation in which torques of the engine 120 and the starter generator 130 are opposite. In addition, in order to enter the assist mode using the torque of the starter generator 130 as auxiliary power, the driver's requested torque must be high because the starter generator 130 assists the torque to satisfy the user's requested torque.

Accordingly, the diagnosis mode determination unit 113 may 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 diagnosis mode determiner 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 constant belt tension to a certain extent, it does not have a significant effect in a situation where the belt tension is deliberately applied strongly. The belt failure diagnosis mode is a situation in which the tensioner is operating in a high-speed driving situation of the vehicle, and since the tensioner operation is reflected in the reference value, the operation of the tensioner is not greatly considered when diagnosing a belt failure.

The calculation unit 115 may calculate a reference value used for diagnosing a belt failure of the belt driving system 150 in normal times. The calculation unit 115 may calculate an average value of the belt tension Tl using the dynamics value of the starter generator 130 in a coast regen situation according to coasting of the vehicle. An 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, negative torque must be requested as the target torque. In addition, for the increasing negative torque, the torque of the engine 120 is increased using the supercharger 160 so that the total torque is not affected. The reason why the torque of the engine 120 is increased by using the super charger 160 is to quickly increase the torque of the engine 120 in a situation where there is no torque requested by the user.

The fault determination unit 117 calculates the belt tension Tl in the case of the belt fault diagnosis mode operation and the coasting power generation mode in which the starter generator 130 generates negative torque, so that the engine 120 is in an idle state. When , a target torque value for diagnosing a belt failure may be generated. At this time, even if the target torque value is input, since the inertial power generation mode has not yet been entered, the corresponding target torque is not input to the starter generator 130.

When the starter generator 130 outputs a larger negative torque than the existing target charging amount value, a sense of heterogeneity, such as a sudden decrease in vehicle speed, may occur, which may affect vehicle drivability.

Accordingly, the failure determination unit 117 may drive the super charger 160 to compensate for the difference between the target torque for belt diagnosis and the target torque according to the 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 super charger 160 so that the total torque amount remains constant. This does not affect the drivability of the vehicle.

The calculation unit 115 may calculate an average value of the belt tension Tl for a specific time according to the coasting power generation mode when operating in the belt failure diagnosis mode. Here, the reason why the belt failure diagnosis is performed in the inertial power generation mode is that the case where the starter generator 130 continues to generate negative torque is the power generation mode. That is, although the torque of the starter generator 130 may have a negative value while the vehicle is driving, the state of 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 changes depending on the vehicle speed and gear stage in the inertia power generation mode, the failure determination unit 117 determines a constant torque to minimize the influence on drivability when diagnosing a belt failure. It is possible to drive the starter generator 130 with a fixed target torque to output. The failure determination unit 117 may compensate a difference value between a target torque for diagnosing a belt failure and a target torque according to coasting power generation with the torque of the engine 120 .

The failure determination unit 117 may determine whether or not 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 in order to consider the error range.

The failure determination unit 117 may compare the difference between the reference value and the hysteresis value with an average value of the belt tension. The failure determination unit 117 may determine that the belt tension is normal when the difference value is less than the average value. When the belt tension is determined to be normal, the failure determination unit 117 may terminate the belt failure diagnosis mode and initialize parameters related to failure diagnosis. At this time, the failure determination unit 117 may maintain the reference value and reset the reference value when the belt is replaced. In addition, the failure determination unit 117 may initialize the reference value when it is determined that the belt is being serviced and the warning light is turned off.

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

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

The failure determination unit 117 may operate the belt protection mode so that the belt is not deteriorated further due to a high tension applied to the belt.

When the belt protection mode is operated, the failure determination unit 117 may drive the starter generator 130 with minimum torque so that a large tension is not applied to the belt.

3 is a diagram for explaining belt tension according to rotational directions of an engine and a starter generator.

Figure 3 (a) shows a situation where the tension of the belt increases according to the rotation of the engine 120. The failure determining unit 117 can easily determine the belt failure when the belt tension increases.

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

(c) of FIG. 3 shows a situation in which the belt tension increases as the engine 120 and the starter generator 130 rotate. At this time, while the vehicle is running, rotational directions of the engine 120 and the starter generator 130 are the same and torque directions are opposite.

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

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

In the driver's 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 a positive torque value. A total torque obtained by adding the torques of the engine 120 and the starter generator 130 may have a positive torque value.

In a coasting regen situation, the driver's requested torque may have a torque value of 0. Also, the torque of the engine 120 may have a positive torque value. Also, the torque of the starter generator 130 according to the assist mode may have a negative torque value. Also, the total torque obtained by adding the torques of the engine 120 and the starter generator 130 may have a negative torque value.

In a belt diagnosis situation, the driver's requested torque may have a torque value of zero. Also, the torque of the engine 120 may have a positive torque value. Also, the torque of the starter generator 130 according to the assist mode may have a negative torque value. Also, the total torque obtained by adding the torques of the engine 120 and the starter generator 130 may have a negative torque value. At this time, the torque of the engine 120 is increased by the increased torque of the starter generator 130 to diagnose the belt failure, so there is no change in the total torque.

5 is a flowchart of a method for diagnosing a belt failure in a control device of a mild hybrid vehicle according to a preferred embodiment of the present invention.

Referring to FIGS. 1, 2, and 5 , a method for diagnosing a belt failure of a control device of a mild hybrid vehicle according to a preferred embodiment of the present invention is an operating state (dynamics) of the starter generator 130 in a driving state of the vehicle. It is characterized in that the reliability and stability of the vehicle are improved by calculating the tension of the belt and periodically checking the belt in consideration of preventing a vehicle accident due to a belt failure in advance.

In the driving distance determining step ( S510 ), the diagnosis mode determining unit 113 may compare the driving distance while the vehicle is driving with a predetermined threshold distance THD. The diagnosis mode determining unit 113 may determine that a belt failure diagnosis of the belt driving system 150 is necessary when the driving distance of the vehicle is greater than or equal to a critical distance. The diagnosis mode determiner 113 may determine that the belt failure diagnosis 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 the belt failure diagnosis is not necessary, the calculation unit 115 calculates the reference value used to determine the belt failure using the dynamics value of the starter generator 130. can do.

In the diagnosis mode request step (S530), when it is determined that the belt failure diagnosis is necessary, the diagnosis mode determining 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 check whether the assist mode is present or not. The diagnosis mode determiner 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 diagnosis mode determining unit 113 determines whether the torque (Eng. TQ) of the engine 12 is greater than or equal to the reference torque (THD), the RPM value (Eng. RPM) is greater than or equal to the reference RPM (THD), and the torque assist mode is in operation. If it is determined that it is, it may operate in a 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 diagnosing a belt failure when the engine 120 is in an idle state. The failure determination unit 117 may drive the super charger 160 to compensate for a difference between the target torque for belt diagnosis and the target torque according to the existing coasting power generation, with the torque of the engine 120 . When operating in the belt failure diagnosis mode, the calculator 115 may calculate an average value of the belt tension Tl for a specific period of time using the dynamics value of the starter generator 130 according to the coasting 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 an 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 when the difference value is less than the average value. When the belt tension is determined to be normal, the failure determination unit 117 may terminate the belt failure diagnosis mode and initialize parameters related to 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 predetermined specific count (failure count). The failure determination unit 117 may determine that the final belt has failed when the count is greater than or equal to the failure count. The failure count can be appropriately set according to the user's needs.

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

In the protection mode operation step ( S610 ), the failure determination unit 117 may operate the belt protection mode so that the belt is not deteriorated further due to high tension applied thereto.

In the torque limiting step (S620), the failure determination unit 117 may drive the starter generator 130 with the minimum torque during the belt protection mode operation so that a large tension is not applied to the belt.

The above description is merely an example of the technical idea of the present invention, and those skilled in the art can make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings. .

Steps and/or actions in accordance with the present invention may occur concurrently in different embodiments, in different orders, or in parallel, or for different epochs, etc., as would be understood by one skilled in the art. can

In some embodiments, some or all of the steps and/or actions may include instructions, programs, interactive data structures, clients and/or servers stored on one or more non-transitory computer-readable media. At least some of them may be implemented or performed using one or more processors that do. The one or more non-transitory computer-readable media may illustratively be software, firmware, hardware, and/or any combination thereof. Additionally, the functions of a “module” 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: diagnosis 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 diagnosis mode determining unit for determining whether a fault diagnosis mode is operating for a belt connecting an engine and a starter generator while the vehicle is running;
a calculation unit calculating an average value of the tension of the belt in the state of coasting power of the vehicle when operating in the failure diagnosis mode; and
a failure determination unit determining whether the belt is out of order by using an average value of the tension of the belt and a predetermined reference value;
A control device for a mild hybrid vehicle comprising a. According to claim 1,
The diagnosis mode determination unit,
Comparing the driving distance of the vehicle with a predetermined threshold distance, and determining that the belt failure diagnosis is necessary when the driving distance is equal to or greater than the threshold distance according to the comparison result. According to claim 2,
The diagnosis mode determination unit,
The control device for a mild hybrid vehicle, characterized in that for checking torque and RPM values of the engine and whether an 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 diagnosis mode determination unit,
Control of the mild hybrid vehicle, characterized in that operating in the failure diagnosis mode, when the torque of the engine is equal to or greater than the preset reference torque, the RPM value is equal to or greater than the preset reference RPM, and the assist operation of the starter generator is confirmed. Device. According to claim 1,
The calculator,
The mild hybrid vehicle control device according to claim 1 , wherein an average value of tension of the belt is calculated using a dynamics value including a moment of inertia, acceleration, and torque of the starter generator when operating in the fault diagnosis mode. According to claim 5,
The failure determination unit,
When operating in the failure diagnosis mode, the target torque for belt diagnosis is generated, and the torque of the engine is compensated by considering a difference between the target torque for belt diagnosis and the target torque according to coasting power generation. controller. According to claim 6,
The failure determination unit,
Calculating a difference value between the reference value and the hysteresis value considering the error range, comparing the difference value with an average value of the tension of the belt, and determining whether the belt is out of order according to the comparison result of the mild hybrid vehicle controller. According to claim 7,
The failure determination unit,
When the difference value is equal to or greater than the average value of the tension of the belt, a count value is increased, and when the count value is equal to or greater than a preset failure count, the control device for a mild hybrid vehicle, characterized in that determining that the belt is out of order . According to claim 8,
The failure determination unit,
When it is determined that the belt is out of order, the control device of the mild hybrid vehicle, characterized in that for limiting the torque of the starter generator to a minimum torque. A diagnosis mode determination step of determining whether a fault diagnosis mode is operated for a belt connecting an engine and a starter generator while the vehicle is driving;
an average value calculation step of calculating an average value of the tension of the belt in a state of coasting power generation of the vehicle when operating in the failure diagnosis mode; and
a failure determination step of determining whether the belt is out of order by using an average value of the tension of the belt and a predetermined reference value;
A method for diagnosing a belt failure of a control device of a mild hybrid vehicle comprising a. According to claim 10,
a mileage determination step of comparing the mileage of the vehicle with a preset threshold distance before the diagnosis mode determining step, and determining that the belt failure diagnosis is necessary when the mileage is equal to or greater than the threshold distance as a result of the comparison;
A method for diagnosing a belt failure of a control device of a mild hybrid vehicle, further comprising: According to claim 11,
In the step of determining the diagnosis mode,
and checking torque and RPM values of the engine and whether an assist operation of the starter generator is performed when the driving distance is equal to or greater than the critical distance. According to claim 12,
In the step of determining the diagnosis mode,
Operating in the fault diagnosis mode when the torque of the engine is equal to or greater than the preset reference torque, the RPM value is equal to or greater than the preset reference RPM, and the assist operation of the starter generator is confirmed. A method for diagnosing a belt failure in a control unit of a mild hybrid vehicle. According to claim 10,
The average value calculation step,
Belt failure diagnosis of the control device of a mild hybrid vehicle, characterized in that when operating in the failure diagnosis mode, an average value of the tension of the belt is calculated using a dynamics value including a moment of inertia, acceleration, and torque of the starter generator method. 15. The method of claim 14,
The average value calculation step,
When operating in the failure diagnosis mode, generating a target torque for belt diagnosis, and compensating for the torque of the engine in consideration of a difference between the target torque for belt diagnosis and the target torque according to coasting power generation. A method for diagnosing a belt failure in a control unit of a mild hybrid vehicle. According to claim 15,
The failure determination step,
Calculating a difference value between the reference value and the hysteresis value considering the error range, comparing the difference value with an average value of the tension of the belt, and determining whether the belt is out of order according to the comparison result of the mild hybrid vehicle A method for diagnosing belt failures in control units. 17. The method of claim 16,
a count step of performing a count of increasing a count value when the difference value is equal to or greater than the average value of the tension of the belt after the failure determination step; and
a count determination step of determining that the belt is out of order when the count value is greater than or equal to a preset failure count;
A method for diagnosing a belt failure of a control device of a mild hybrid vehicle, further comprising: 18. The method of claim 17,
a torque limiting step of limiting and setting the torque of the starter generator to a minimum torque when it is determined that the belt is out of order after the count determination step;
A method for diagnosing a belt failure of a control device of a mild hybrid vehicle, further comprising:

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