KR100738127B1 - Belt tension force control system and method of belt-driven ISG vehicle - Google Patents

Abstract

The present invention relates to a belt tension control system and a control method of an intermittent driving vehicle equipped with a belt driven ISG. The present invention relates to a belt tension connected to an ISG when an external control signal is applied in a dual power system vehicle that implements an idle stop / high function. Start by the ISG by installing a variable tensioner to increase and increasing the belt tension by using the variable tensioner when the belt tension demand calculated based on the belt and battery status information is higher than the reference value when the engine restarts by the ISG. The present invention relates to a belt tension control system and a control method of an intermittent driving vehicle equipped with a belt driven ISG configured to secure an appropriate torque for starting an engine.

Dual power system, ISG, belt, variable tensioner, tension control

Description

Belt tension control system and method for belt-driven ISG vehicle

1 schematically shows the configuration of a typical dual power supply system employing a 42V belt driven ISG;

2 is a block diagram showing the configuration of a belt tension control system according to the present invention;

Figure 3a and Figure 3b is a cross-sectional view showing the internal configuration and operating state of the variable tensioner employed in the present invention,

4a and 4b is a view showing a belt tension state according to the operating mode of the variable tensioner in the present invention,

5 is a view showing a temperature sensor in the present invention,

6 is a flowchart illustrating a control process according to the present invention;

Fig. 7 is a graph showing the relationship between the belt temperature estimate value and the crankshaft ambient temperature measurement value measured by the temperature sensor.

<Explanation of symbols for the main parts of the drawings>

100: ISG sprocket 101: belt

102: crank sprocket 103: tensioner idler

104: tensioner arm 110: temperature sensor

120: BMS 130: MCU

140: solenoid controller 150: variable tensioner

151: tensioner body 152: return spring

153: moving object 154: rod

155: solenoid actuator 156: solenoid

156a: Supporting End 157: Female Coil

The present invention relates to a belt tension control system and a control method of an intermittent driving vehicle equipped with a belt driven ISG, and more particularly, connected to the ISG when an external signal is applied in a dual power system vehicle that implements an idle stop / high function. By installing a variable tensioner to increase the belt tension and increasing the belt tension by using the variable tensioner when the belt tension demand calculated based on the belt and battery condition information is higher than the reference value when the engine restarts by the ISG, the ISG is increased. The present invention relates to a belt tension control system and a control method of an intermittent driving vehicle equipped with a belt-driven ISG configured to secure sufficient torque for starting an engine by starting with the engine.

The electric device of the car can be compared to the nervous system of a person, and the electric device can be exerted in its excellent performance only when the electric device is normally operated.

Engine electric devices (starters, ignition devices, charging devices) and lighting devices are generally used as electric devices in automobiles. However, as the vehicle is more electronically controlled, most systems including chassis electric devices are becoming more electronic. .

On the other hand, various electric appliances such as lamps, audio, heaters, air conditioners, etc. installed in a vehicle are supplied with power from a battery when the vehicle is stopped and from a generator when the vehicle is stopped. Power generation capacity is being used.

However, in recent years, with the development of the information technology industry, various new technologies (motor-driven steering devices, the Internet, etc.) aiming at increasing the convenience of automobiles have been applied to vehicles. It is expected to continue.

Therefore, the existing 14V power supply system is unable to supply enough power to the vehicle to which the new technology is applied, and therefore, it is required to introduce a power supply system capable of supplying more power. System.

In other words, the power supply system of automobiles is doubled to 14V / 42V, and the power efficiency is increased by supplying the voltage of 42V to the clocks and motors requiring high power, and the low-power devices use the existing 14V power system. .

Referring to FIG. 1, a dual power supply system of an automobile includes an integrated starter generator (ISG) having a starter function and generating high power, and controlling the amount of power generation and the starter function of the ISG 31. Motor control unit (MCU) 36 which performs general control of ISG driving, etc., 36V battery 32 which stores power generated from power generation system of 42V ISG 31, and controls this 36V battery 32 Battery management system (BMS: 33) to manage, various high-power devices (not shown) equipped with a 42V motor driven by the 36V battery 32, the voltage from the 36V battery 32 DC / A bidirectional DC / DC converter 35 for converting to direct current, a 12V battery 37 for charging the voltage converted from the DC / DC converter 35, and a low power device driven by the 12V battery 37 voltage (not shown) ) And the like.

Among the various components of the dual power supply system, the ISG 31 replaces the existing starter and alternator, and as a starter by receiving 42V power supplied from a 36V battery 32 under the control of the MCU 36 at initial startup. In operation, the engine operates as an alternator during normal operation of the engine.

The 42V power generated from the ISG 31 is stored in the 36V battery 32. The power of the 36V battery 32 is stored in the water pump, the electric air conditioner compressor, the fuel pump, and the radiator with the 42V motor applied under the control of the MCU 36. Drives high-power devices such as fans, wipers, condenser fans, and power windows.

Current 42V system vehicles can be classified into direct type with 42V ISG installed between engine and transmission, and belt driven type with 42V ISG connected to engine and belt at current alternator seat.

1 is a diagram schematically showing a typical intermittent driving vehicle configuration in which a 42V belt driven ISG is employed.

On the other hand, the intermittent driving vehicle that wants to improve fuel efficiency through the idle stop has the idle stop & go function of the hybrid vehicles.

Here, the idle stop / high function means that the engine is automatically stopped under a predetermined condition such as when the vehicle stop state is maintained for a predetermined time or more, and when a restart is requested by the driver's will and the vehicle's own condition. A function that automatically restarts the engine (Go) via the starter or ISG to enable normal operation.

This feature prevents fuel consumption unrelated to driving wheels when the engine is idle, which provides about 15% fuel economy and reduced emissions during urban traffic congestion.

On the other hand, in the intermittent driving vehicle employing the 42V belt driven ISG, the role of this belt is important because the ISG acting as the starter and the alternator is connected to the belt and the power is transmitted. Affects belt life, noise, etc.

As a related technology, the balance of force against the tension change of a belt in an ordinary vehicle is adjusted by using an autotensioner, which has positive effects such as improving the overall transmission efficiency of the belt drive system, improving fuel efficiency, extending the life and reducing the noise. Providing.

In the case of an idle high / stop function vehicle (intermittent driving vehicle) employing a belt-driven ISG, belt tension is a major factor in securing the torque required to start the engine in the engine restart process repeatedly performed by the ISG.

In other words, when the belt tension is increased, sufficient torque necessary for starting the engine can be secured through starting by the ISG, and the starting torque transmitted through the belt from the ISG can be increased.

However, the increase in belt tension is obviously advantageous for securing torque when starting the engine by the ISG but can reduce the belt life during the ISG power generation operation, which requires control of the belt tension associated with ISG operation. It is necessary to give proper control considering the control factor.

Currently, there are no techniques for increasing the starting torque through belt tension variable technology and belt tension control for idle stop / high function in dual power system vehicles employing ISG.

Therefore, the present invention has been invented to solve the above inconvenience, install a variable tensioner to increase the belt tension connected to the ISG when the external signal is applied in a dual power system vehicle that implements the idle stop / high function, When the engine is restarted by the ISG, the belt tension is increased by using the variable tensioner when the belt tension demand value calculated based on the belt and battery condition information is higher than the reference value, so that sufficient torque necessary for starting the engine is started by the ISG. An object of the present invention is to provide a belt tension control system and a control method for an intermittent driving vehicle equipped with a belt driven ISG configured to be secured.

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

The present invention provides a system for controlling a belt tension connected between a crank sprocket and an ISG sprocket in an intermittent driving vehicle equipped with a belt driven ISG.

A temperature sensor installed near the belt to detect the belt ambient temperature;

The belt temperature and belt slip constant are calculated from the belt ambient temperature detected by the temperature sensor in the engine restart condition by ISG, and the calculated belt temperature and belt slip constant and the battery voltage / current and charge state information inputted from the BMS are calculated. A MCU which calculates a belt tension requirement for starting the ISG on the basis of the current state and outputs a signal for increasing the belt tension before starting the engine when the belt tension requirement is higher than the reference value;

A solenoid controller for applying operating power to the following solenoid actuator when a signal is applied from the MCU;

A variable tensioner having a solenoid actuator for operating a rod in the tensioner body in a direction in which belt tension is increased when operating power is applied from the solenoid controller;

Characterized in that it comprises a.

Here, the solenoid actuator is a solenoid for supporting the rear end of the return spring through the support end formed in the tip of the tensioner body, and when the power is applied, the return spring, the moving body and the rod in the direction of increasing the belt tension Characterized in that it comprises a excitation coil for operating.

In addition, the MCU outputs a signal for releasing the belt tension increase state in the state that the engine start is completed, the solenoid controller is characterized in that the power off the solenoid actuator when the release signal is input from the MCU.

On the other hand, the present invention is a method for controlling the belt tension connected between the crank sprocket and the ISG sprocket in an intermittent driving vehicle equipped with a belt driven ISG,

The MCU calculates the belt temperature and belt slip constant from the belt ambient temperature detected by the temperature sensor near the belt in the engine restart condition by the ISG, and calculates the belt temperature and belt slip constant and the battery voltage / current and charge input from the BMS. Calculating a belt tension requirement for starting the ISG in the current state based on the state information;

If the calculated belt tension request value is less than the reference value, the MCU outputting a signal for increasing the belt tension before starting the engine;

Applying a operating power to a solenoid actuator provided in a variable tensioner by a solenoid controller when a signal is applied from the MCU;

Increasing the belt tension by operating the rod inside the tensioner body by the solenoid actuator by an operating power source applied from the solenoid controller;

Characterized in that it comprises a.

The MCU may determine a state in which engine starting is completed and output a signal for releasing a belt tension increase state;

Disconnecting power of the solenoid actuator by the solenoid controller when a release signal is input from the MCU;

It characterized in that it further comprises.

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

The present invention relates to a belt tension control system and a control method of an intermittent driving vehicle equipped with a belt-driven ISG, and increases the belt tension connected to the ISG when an external signal is applied in a dual power system vehicle implementing an idle stop / high function. A variable tensioner is installed to increase the belt tension by using the variable tensioner when the belt tension demand calculated based on the belt and battery status information is higher than the reference value when the engine restarts by the ISG. The present invention relates to a belt tension control system and a control method of an intermittent driving vehicle equipped with a belt-driven ISG configured to secure sufficient torque for starting an engine.

2 is a block diagram showing the configuration of the belt tension control system according to the present invention, Figures 3a and 3b is a cross-sectional view showing the internal configuration and operating state of the variable tensioner employed in the present invention, Figure 3a The state before the solenoid actuator is actuated, FIG. 3B shows the state in which the solenoid actuator is actuated.

Figures 4a and 4b is a view showing the belt tension state according to the operating mode of the variable tensioner in the present invention, Figure 4a shows the belt tension state (general belt tension mode) during the power generation operation of the ISG, Figure 4b The belt tension is increased (belt tension increase mode) by the variable tensioner when the engine is started.

The variable tensioner 150 employed in the present invention is configured by adding a solenoid actuator 155 that operates to forcibly increase the thruster force when a signal is applied from the outside to the existing tensioner configuration.

The variable tensioner 150 is installed on a belt 101 which transmits a driving force between the crank sprocket 102 and the ISG sprocket 100 and contacts the belt 101 to impart tension. The tensioner idler 103 and the tensioner arm 104 interlocking with the tensioner idler 103, the rod 154 for changing the position of the tensioner idler 103 by pressing the end portions of the tensioner arm 104, the tensioner main body ( The basic configuration such as the moving body 153 and the return spring 152 in the inside of the 151 is the same as that of the existing tensioner.

3A and 3B, the solenoid actuator 155 including the solenoid 156 and the excitation coil 157 is additionally installed inside the tensioner main body 151, and the solenoid 156 is provided. Is installed to support the rear end of the return spring 152 through the support end 156a formed at the front end.

The solenoid actuator 155 is controlled by the solenoid controller 140. When the solenoid controller 140 applies power to operate the solenoid actuator 155, the excitation coil 157 is energized, the solenoid is energized. 156 advances and pushes the return spring 152.

When the return spring 152 is pushed forward by the solenoid 156 as described above, the movable body 153 and the rod 154 inside the tensioner main body 151 are moved forward, so that the rod 154 As the tensioner arm 104 is pushed forward, the tensioner arm 104 moves the tensioner idler 103 in a direction in which the belt tension increases.

The variable tensioner 150 has an additional function of forcibly increasing the thruster of the tensioner and the tension of the belt by operating the solenoid actuator 155 when a signal is applied from the outside in addition to the basic function of the auto tensioner by the existing mechanical spring operating structure. do.

On the other hand, the belt tension control system according to the present invention is installed in the vicinity of the belt in the engine room includes a temperature sensor 110 for detecting the belt ambient temperature, the temperature sensor in this invention is shown in Figures 2 and 5 Reference numeral 110 is used.

5 is a view showing a temperature sensor for estimating the belt temperature in the present invention, reference numeral 11 denotes a crank shaft of the engine, reference numeral 100 denotes a sprocket (ISG sprocket) of 42V ISG, reference numeral 102 denotes a crank sprocket And reference numeral 101 denotes a belt for transmitting a driving force between the crank sprocket 102 and the ISG sprocket 100.

The temperature sensor 110 is a temperature sensor installed to estimate the temperature of the belt 101, the belt temperature in the present invention is estimated by measuring the belt ambient temperature.

As a preferred embodiment, the temperature sensor 110 may be installed around the engine crankshaft near the belt 101 to detect the crankshaft ambient temperature as the belt ambient temperature, which is output from the temperature sensor 110. The detection signal is input to the MCU (or ISG controller) 130 and used by the MCU 130 to calculate the belt temperature and the belt slip constant.

As described above, the belt ambient temperature detected by the temperature sensor 110, that is, the crankshaft ambient temperature, is used to calculate the belt temperature and the belt slip constant, and it is difficult to directly detect the belt temperature. On the basis of the MCU 130 calculates the belt temperature and the belt slip constant from the belt ambient temperature detected by the temperature sensor 110.

In addition, in the present invention, the MCU 130 receives the output signal of the temperature sensor 110 as described above and at the same time the current battery voltage / from a battery management system (hereinafter referred to as BMS; 120) to control and manage the 36V battery Current and state of charge information is received.

In a dual power system, the BMS measures battery voltage / current, calculates the state of charge accurately, and provides it as a vehicle control variable.

The MCU 130 calculates the belt temperature and the belt slip constant from the output signal of the temperature sensor 110, and calculates the belt temperature and the belt slip constant and the battery voltage / current and charge state information input from the BMS 120. On the basis of this, the belt tension requirement for starting the ISG at the present state is calculated.

Examples of belt temperatures and belt slip constants used to calculate belt tension are as follows.

The belt temperature is estimated by measuring the belt ambient temperature. When the temperature of the temperature sensor 110 for detecting the belt ambient temperature (engine crankshaft ambient temperature) is about 60 ° C, the belt temperature is about 45 ° C. When the engine crankshaft ambient temperature is about 90 ° C, the belt temperature has a temperature distribution of about 85 ° C.

Obtaining the belt slip constant from the belt temperature utilizes pre-stored data, that is, data in which the belt slip constant is stored with respect to the belt temperature (Look Up Table).

7 is a graph showing the relationship between the belt temperature estimate value and the crankshaft ambient temperature measurement value measured by the temperature sensor.

This can be changed according to each system because the temperature of the belt can be changed according to the cooling structure of the engine, this example is an experimental example of a specific vehicle.

In addition, when the temperature of the belt is low, a higher tension is required, and the belt slip constant may affect the temperature of the belt.

Belt slip is largely dependent on the wrap angle around the force of the belt across the idler, and the coefficient of friction has a value of 0.4 to 0.6 for each system.

In addition, the MCU 130 compares the calculated belt tension request value with the reference value at the start of the ISG. If the belt tension demand value is equal to or greater than the reference value, the MCU 130 outputs a signal for increasing the belt tension to the solenoid controller 140 in a state before starting the engine. It is supposed to be.

When the signal is applied from the MCU 130, the solenoid controller 140 drives the solenoid actuator 155 to increase the belt tension.

Hereinafter, a process of controlling the belt tension using the variable tensioner in the intermittent driving vehicle equipped with the ISG will be described in detail.

6 is a flowchart illustrating a control process according to the present invention.

First, the MCU 130 determines whether the current condition corresponds to the engine restart condition, that is, the restart condition by the ISG after the idle stop while driving the vehicle, and if it corresponds to the restart condition, input from the temperature sensor 110 and the BMS 120. Based on the belt ambient temperature information and the battery voltage / current and state of charge information, the belt tension requirement for starting the ISG is calculated.

Thereafter, the MCU 130 compares the belt tension request value with a preset input reference value. If the belt tension demand value is less than the reference value in the current state, the MCU 130 does not output a separate signal to maintain the belt tension as it is (general belt tension mode). 4A), on the other hand, when the reference value is greater than or equal to the reference value, a signal for increasing the belt tension is output to the solenoid controller 140.

The solenoid controller 140 applies power for operating the solenoid actuator 155 when a signal is applied from the MCU 130, and the solenoid actuator 155 has an excitation coil (S) by a power applied from the solenoid controller 140. As the 157 is energized, the solenoid 156 moves forward.

As the solenoid 156 moves forward, the return spring 152, the moving body 153, and the rod 154 move forward to push the tensioner arm 104 as shown in FIG. 4B, and thus the tensioner arm ( 104 moves the tensioner idler 103 in the direction in which the tension of the belt 101 increases.

In the state in which the tension of the belt 101 is increased (belt tension increase mode) as described above, the MCU 130 performs motor starting torque calculation, restart torque determination, and ISG start control according to a normal procedure, thereby starting the engine. You lose.

Thereafter, after the engine is started by the ISG completely, the MCU 130 outputs a signal for releasing the belt tension increase state to the solenoid controller 140, in which the solenoid controller 140 cuts off the power supply to the solenoid. The actuator 155 is turned off.

After the solenoid actuator 155 is turned off, the belt tension is returned to FIG. 4A with the return spring 152, the moving body 153, the rod 154, the tensioner arm 104, and the tensioner idler 103 all restored to their original state. As it is then reduced (normal belt tension mode).

As described above, in the present invention, the belt tension is increased only when the engine is started by the ISG to secure sufficient torque necessary for starting the engine, thereby preventing the belt life from being shortened by the high torque.

In addition, when the ISG performs the power generation process after restarting the engine as shown in FIG. 6, while the MCU 130 performs normal ISG power generation control and the solenoid actuator 155 is turned off, the variable tensioner 150 forces the thrust. It operates in the normal belt tension mode, which is basically performed without increasing.

In this way, when the engine is started, the belt tension is increased to secure sufficient torque for starting the engine by starting with the ISG, and the high torque can reduce the belt life. In normal driving, the belt tension is kept small to maintain the structure suitable for ISG power generation.

As described above, according to the belt tension control system and control method of the intermittent driving vehicle equipped with the belt-driven ISG according to the present invention, the ISG when the external signal is applied in the dual power system vehicle that implements the idle stop / high function By installing a variable tensioner to increase the belt tension connected to the belt, and increasing the belt tension by using the variable tensioner when the belt tension demand value calculated based on the belt and battery status information at the engine restart by the ISG is above the reference value In addition, it is effective to secure sufficient torque necessary for starting the engine through starting by the ISG.

In particular, high torques can reduce belt life, and are therefore configured to increase belt tension only at engine start, providing the effect of increasing belt life and replacement cycles.

Claims (5)

delete delete delete A method of controlling belt tension connected between a crank sprocket and an ISG sprocket in an intermittent driving vehicle equipped with a belt driven ISG, The MCU 130 calculates the belt temperature and the belt slip constant from the belt ambient temperature detected by the temperature sensor 110 near the belt in the engine restart condition by the ISG, and calculates the belt temperature and the belt slip constant and the BMS 120. Calculating a belt tension request value for starting the ISG in the current state based on the battery voltage / current and the state of charge information inputted in the step; If the calculated belt tension request value is less than the reference value, MCU 130 outputs a signal for increasing the belt tension before starting the engine; When the signal is applied from the MCU (130), the solenoid controller (140) applying the operating power to the solenoid actuator (155) provided in the variable tensioner (150); Increasing the belt tension by the solenoid actuator 155 operating the rod 154 inside the tensioner main body 151 by the operating power applied from the solenoid controller 140; Belt tension control method of the intermittent driving vehicle is equipped with a belt-driven ISG comprising a. delete

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