KR20200128271A - ISG Control Method - Google Patents

Abstract

Disclosed is an ISG control method. According to an embodiment of the present invention, the ISG control method for implementing an idle stop & go (ISG) function of a vehicle without a battery sensor comprises: an engine starting type determination step of determining whether starting of an engine is initial starting or starting by ISG; an initial starting step of measuring a battery starting voltage (Vs) when the starting of the engine is initial starting in the engine starting type determination step, and starting the engine when the starting voltage (Vs) is greater than or equal to a preset reference voltage; an ISG entering ready step of measuring a charging voltage (Vc) after starting the engine, and performing an ISG entering ready operation when the measured charging voltage (Vc) is greater than or equal to a reference value; and an ISG entering prohibition step of starting the engine when a voltage difference between a starting voltage (Vs) and a re-starting voltage (Vr) is less than a reference value after the engine is stopped by an ISG function and, at the same time, performing an ISG entering prohibition request. According to the present invention, the control method can implement the ISG function by determining a vehicle condition only with minimum conditions such as a vehicle and an environment for a vehicle without a battery sensor or a vehicle with a broken battery sensor.

Description

ISG Control Method {ISG Control Method}

The present invention relates to an ISG control method, and more particularly, to a control method for implementing the ISG function of a vehicle without a battery sensor or a vehicle in which the battery sensor has failed.

At this point in which fuel economy improvement is becoming a hot topic, the ISG system is being widely applied worldwide. The ISG system receives information such as vehicle speed, engine rotation speed, and coolant temperature and commands the engine to stop when idle. In other words, the ISG system automatically stops the engine while idling when the vehicle is stopped due to waiting for a signal while driving in the city, and restarts the engine when the vehicle attempts to start after a predetermined time. The ISG system is also expressed as an idle stop control device. The ISG system can achieve a fuel economy effect of about 5 to 15% in actual fuel economy mode. Vehicles equipped with such an ISG system are called ISG vehicles.

In the case of an ISG vehicle according to the prior art, a battery sensor capable of monitoring the state of a rechargeable battery must be installed. The ISG control method according to the prior art is a method of performing an ISG function together with data obtained from a battery sensor after detecting operating state information of a vehicle.

However, in the case of a battery sensor according to the prior art, there is a problem that it cannot be mounted in a low-cost vehicle due to a high manufacturing cost. In some cases, even in the case of a vehicle equipped with a battery sensor, the ISG function is performed when the battery sensor is broken. There is a problem that it cannot be done.

Therefore, there is a need for a technology capable of solving the problems according to the prior art mentioned above.

Korean Patent Publication No. 10-2012-0059231 (published on June 08, 2012)

It is an object of the present invention to provide a control method for implementing an ISG function by determining a vehicle condition through a minimum condition for a vehicle in which a battery sensor is not installed or a vehicle in which the battery sensor is broken.

An ISG control method according to an aspect of the present invention for achieving this purpose is a control method for implementing an idle stop & go (ISG) function of a vehicle without a battery sensor, and whether the engine is initially started or is An engine start type determination step of determining whether it is started by means of; In the engine start-up type determination stage, when the engine is initially started, the engine controller (ECU) measures the battery starting voltage (Vs), and then starts the engine when the starting voltage (Vs) is higher than the preset reference voltage. Initial start-up phase; An ISG entry ready step of measuring the charging voltage Vc by the engine controller (ECU) after starting the engine and performing an ISG entry ready when the measured charging voltage Vc is greater than or equal to the reference value; And an ISG entry prohibition step of performing engine startup when the voltage difference between the starting voltage (Vs) and the restart voltage (Vr) is less than the reference value after stopping the engine by the ISG function and simultaneously performing an ISG entry prohibition request; Can be

In one embodiment of the present invention, the ISG control method, after starting the engine, when the charging voltage (Vc) is less than the reference value, outputs an alternator inspection state or a charging failure state to the vehicle operator, and enters the inspection state The generator check entry step; may be a configuration that further includes.

In an embodiment of the present invention, the ISG control method comprises, after starting the engine, when the charging voltage Vc is less than the reference value, the amount of voltage change per unit time is measured by the engine controller (ECU), and the measured value is the starting voltage If the voltage drop compared to (Vs) is confirmed, it is determined as a jump start, and a jump start determination step of performing an ISG entry prohibition request; may further include a configuration.

In one embodiment of the present invention, the ISG control method comprises, after starting the engine, when the charging voltage Vc is less than the reference value, the current generation voltage is measured in real time by the engine controller (ECU), and the voltage is If the stabilization is not possible and the voltage elevation change occurs in conjunction with the engine rotation speed, it is determined as a jump start due to insufficient battery capacity, and a jump start determination step of performing an ISG entry prohibition request; may further include a configuration.

In an embodiment of the present invention, in the ISG entry ready step, when the charging voltage Vc is greater than or equal to the reference value, the minimum charging time is calculated by the engine controller (ECU) and the calculated minimum charging time is greater than or equal to the reference value. You can perform an entry ready.

In this case, if the calculated minimum charging time is less than the reference value, the minimum charging time is calculated in real time by the engine controller (ECU), and the calculated minimum charging time is monitored in real time if it is more than the reference value, and at the same time, ISG entry ready is performed. I can't.

In addition, the process of calculating the minimum charging time in real time and monitoring in real time whether the calculated minimum charging time is greater than or equal to a reference value can be performed only at the initial start-up.

In one embodiment of the present invention, the ISG control method is, when the voltage difference between the starting voltage (Vs) and the restart voltage (Vr) measured by the engine controller (ECU) after stopping the engine by the ISG function is greater than or equal to the reference value. , The engine controller (ECU) calculates the current consumption voltage and, when the calculated consumption voltage is greater than or equal to the reference value, the ISG restart regression step of performing an ISG entry ready step after starting the engine, may further include a configuration including: .

In this case, in the ISG restart regression step, when the voltage difference between the starting voltage (Vs) and the restart voltage (Vr) by the engine controller (ECU) is greater than or equal to the reference value, a reference voltage that can be started is calculated and the calculated reference If the voltage is less than or equal to the restart voltage Vr, the configuration may further include a process of performing an ISG entry ready step after starting the engine.

In addition, the ISG restart regression step may further include a process of counting the number of ISG entries.

In this case, the ISG control method may further include a forced charging step of calculating the number of ISG entries and performing a forced charging when the calculated number of ISG entries exceeds a preset reference value.

In one embodiment of the present invention, in the initial starting step, a preset reference voltage compared to the starting voltage Vs may be a preset value calculated in proportion to the engine coolant temperature.

In an embodiment of the present invention, a preset reference value compared with the calculated minimum charging time may be a preset value calculated in proportion to a battery voltage and a generator voltage at startup.

As described above, according to the ISG control method of the present invention, a vehicle or a battery sensor without a battery sensor by including a step of determining an engine start type of a specific configuration, an initial start step, an ISG entry ready step, and an ISG entry prohibition step. It is possible to provide a control method for implementing the ISG function by judging the vehicle condition with only the minimum conditions such as vehicle and environment for a vehicle with a faulty failure.

1 is a flowchart showing an ISG control method according to an embodiment of the present invention.
2 is a flow chart showing an ISG control method according to another embodiment of the present invention.
3 is a flow chart illustrating an ISG control method according to another embodiment of the present invention.
4 is a flow chart illustrating an ISG control method according to another embodiment of the present invention.
5 is a table showing a preset reference voltage compared with the starting voltage Vs in the initial starting stage.
6 is a table showing a preset reference value compared with the calculated minimum charging time.
7 is a table showing the voltage consumption per hour according to the battery use temperature.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to a conventional or dictionary meaning, but should be interpreted as meanings and concepts consistent with the technical idea of the present invention.

Throughout this specification, when a member is said to be located "on" another member, this includes not only the case where the member is in contact with the other member, but also the case where another member exists between the two members. Throughout this specification, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

1 is a flow chart showing an ISG control method according to an embodiment of the present invention.

The ISG control method (S100) according to the present invention is a control method for implementing an idle stop & go (ISG) function of a vehicle in which a battery sensor is not installed or a vehicle in which the battery sensor has failed, and an engine start type determination step for performing a specific process (S110), an initial start-up step (S120), an ISG entry ready step (S130), and an ISG entry prohibition step (S140).

In the case of a battery sensor according to the prior art, it serves to measure the state of the battery. The battery sensor measures the current value flowing through the battery and then provides the measured data to an engine control unit (ECU), and the engine controller implements the ISG function based on this. Specifically, the battery sensor continuously analyzes the state of the battery and provides information on key parameters such as a state of charge, a functional state (power function), and a health state (aging) of the battery. The battery sensor according to the prior art is a configuration necessary for the stable start/stop system operation of the vehicle, and the battery sensor automatically controls the engine by notifying whether sufficient energy remains in the battery in an upper control device such as an engine control device or a body control device. And allow it to start again. In addition, the battery sensor allows electrical devices such as radios and ventilation fans to continue to operate when stationary. In hybrid vehicles, the accuracy of the battery sensor and a specific algorithm are essential for measuring the internal resistance (Rint) of the battery. The battery sensor is mounted directly on the battery and can monitor the battery as well as detect defective electronic components in the vehicle by monitoring the current in a key-off state. In addition, the battery sensor enhances the self-diagnosis function of the car so that it can warn even failures that may not be caused by the battery.

However, if the battery sensor is absent or malfunctions, it is not possible to accurately measure the state of the battery. In this case, the present invention can perform ISG control based on the detected voltage value by detecting a specific voltage value in a specific situation and a specific location using an engine controller (ECU).

Specifically, the engine start-up type determination step (S110) is a step of determining whether the engine is initially started or is started by ISG. The engine start type determination step (S110) may be performed by the passenger's ignition key operation, and the engine start type determination step (S110) is performed to restart the engine when certain conditions are satisfied after the engine is stopped by the ISG function. Can be done.

In the initial starting step (S120), when starting the engine in the engine starting type determination step (S110) is the initial starting, after measuring the battery starting voltage (Vs) by the engine controller (ECU), the starting voltage (Vs) is This is the step of starting the engine when the voltage exceeds the preset reference voltage.

At this time, a preset reference voltage value compared with the battery starting voltage Vs measured by the engine controller ECU can be found in the table shown in FIG. 5. It is preferable that the preset reference voltage value is stored in an internal memory of a controller (not shown) in charge of controlling the ISG. The reference voltage values stored in the internal memory are called when the initial start-up step S120 is performed and become a reference value to which the measured start-up voltage Vs is compared.

As shown in FIG. 5, the reference voltage is preferably set in proportion to the cooling water temperature, and it is of course possible to change data based on the experimental value according to the reference or the intention of the designer.

In the initial start-up step (S120), if the measured battery start-up voltage Vs is less than the preset reference voltage, it is determined that the start-up is impossible and outputs it to the operator through visual or audio means.

The ISG entry ready step (S130) is, after starting the engine, measuring the charging voltage Vc by the engine controller (ECU), and then performing the ISG entry ready when the measured charging voltage Vc is more than the reference value. This is the step. At this time, the reference value compared with the measured charging voltage Vc is a preset value, and as mentioned above, it is preferable that the reference value is stored in the internal memory of the controller (not shown) in charge of controlling the ISG. The reference value stored in the internal memory becomes a reference value that is called when performing the ISG entry ready step (S130) and compared with the measured charging voltage (Vc).

In some cases, as shown in part A of FIG. 2, when the charging voltage Vc is greater than or equal to the reference value, the minimum charging time is calculated, and the ISG entry ready can be performed only when the calculated minimum charging time is greater than or equal to the reference value. In this case, the preset reference value compared with the calculated minimum charging time may be a preset value calculated in proportion to the battery voltage and the generator voltage at startup, as shown in FIG. 6. In addition, it is preferable that the preset reference value is stored in an internal memory of a controller (not shown) in charge of ISG control as mentioned above. The reference value stored in the internal memory becomes a reference value that is called and compared with the calculated minimum charging time when performing the corresponding process.

In this case, if the calculated minimum charging time is less than the reference value, it is preferable to calculate the minimum charging time in real time, monitor in real time whether the calculated minimum charging time is more than the reference value, and control not to perform ISG entry ready at the same time. In this case, the process of calculating the minimum charging time in real time and monitoring in real time whether the calculated minimum charging time is greater than or equal to the reference value is preferably performed only at the first start-up. In this case, it is possible to shorten the time required for re-entry to the ISG when restarting by the ISG function.

Hereinafter, an example of calculating the minimum charging time will be described.

In the case of a motorcycle, for example, a small capacity generator is mounted on the motorcycle. It is assumed that the specifications of the generator mounted on the motorcycle are 14V and 280W at 5,000 rpm per minute.

In the case of 14V while driving, the value of (280W x 0.3 (charging efficiency 30%) / 14V) x (14V (current voltage) / 14V (reference voltage)) = 6 Ah can be obtained.

In case of 12V while driving, the value of (280W x 0.3 (charging efficiency 30%) / 14V) x (12V (current voltage) / 14V (reference voltage)) = 5.1 Ah (approximately 15% charging efficiency decrease) can be obtained. .

If the idle state is maintained at 14 V, the value of (280W x 0.3 (charging efficiency 30%) x (1,500rpm/1,500rpm) / 14V) = 1.8 Ah can be obtained.

At this time, for 6Ah, the 1Ah charging time is 10 minutes, and for 5.1Ah, the 1Ah charging time is 12 minutes. In some cases, when a voltage abnormality occurs (for example, at a jump start), a factor value of 1.5 times is added to calculate the required charging time.

In addition, if the number of ISG uses exceeds the reference value within one driving cycle, force charging for at least 30 minutes (about 30% of the battery capacity) is required.

Assuming that the average battery capacity mounted on the motorcycle is 6 to 8 A, the charging time required for full charge during discharge is 1 to 1.5 hours.

Hereinafter, a method of calculating the above-mentioned charge per hour will be described as an example.

Assume that the specifications of the large-capacity generator mounted on the vehicle are 14V, 180Ah.

In the case of 14V, the value of (180W x 0.3 (charging efficiency 30%)) x (14V (current voltage) / 14V (reference voltage)) = 54 Ah can be obtained.

In the case of 12V, the value of (180W x 0.3 (charging efficiency 30%)) x (12V (current voltage) / 14V (reference voltage)) = 46.2 Ah can be obtained. (Approximately 15% reduction in charging efficiency)

By calculating the minimum charging time by the method described above, engine stop by the ISG function can be performed according to specific conditions.

On the other hand, in the process of performing the ISG entry ready step (S130), when the charging voltage Vc is less than the reference value, the generator check entry step in which the alternator check status or the charging defect status is output to the operator and enters the check state It is preferable that (S150) is performed.

In some cases, as shown in FIG. 4, in the process of performing the ISG entry ready step (S130), when the charging voltage Vc is less than the reference value, the amount of voltage change per unit time is measured by the engine controller (ECU), If the measured value is compared with the starting voltage Vs and the voltage drop is confirmed, it is determined as a jump start, and a jump start determination step S161 of performing an ISG entry prohibition request may be performed. In addition, if the charging voltage (Vc) is less than the reference value, the current generation voltage is measured in real time by the engine controller (ECU), and if the voltage is not stabilized within a preset time and there is a change in voltage elevation in connection with the engine speed, A jump start determination step S162 of determining a jump start due to insufficient battery capacity and performing an ISG entry prohibition request may be performed.

The jump start mentioned above refers to starting the engine using an external power source when the amount of power of the battery is insufficient or the state of the battery is not normal.

In the ISG entry prohibition step (S140), after stopping the engine by the ISG function, when the voltage difference between the starting voltage Vs and the restart voltage Vr is less than the reference value, starting the engine and simultaneously executing the ISG entry prohibition request to be.

1 to 4, the ISG control method S100 according to the present embodiment may further include an ISG restart regression step S170 for performing a specific process.

Specifically, in the ISG restart regression step (S170), after the engine is stopped by the ISG function, when the voltage difference between the starting voltage Vs and the restart voltage Vr is greater than the reference value, the current consumption voltage is calculated and the calculated consumption voltage is If it is more than the reference value, after starting the engine, the ISG entry ready step (S130) is performed.

In this case, as the reference value compared with the calculated voltage consumption, as shown in FIG. 7, the voltage consumption per hour according to the battery use temperature may be set as the reference value. In addition, it is preferable that the preset reference value is stored in an internal memory of a controller (not shown) in charge of ISG control as mentioned above. The reference value stored in the internal memory becomes a reference value that is called up and compared with the calculated consumed voltage calculated during the corresponding process.

In addition, in the ISG restart regression step (S170), when the voltage difference between the starting voltage (Vs) and the restart voltage (Vr) is greater than or equal to the reference value, a reference voltage that can be started is calculated, and the calculated reference voltage is the restart voltage (Vr). ) Or less, after starting the engine, the ISG entry ready step (S130) may be further included.

In some cases, as shown in FIGS. 3 and 4, the ISG restart regression step (S170) may further perform a process (S180) of counting the number of ISG entries.

In this case, the ISG entry count is calculated, and when the calculated ISG entry count exceeds a preset reference value, a forced charging execution step (S190) of performing a forced charging may be further performed.

As described above, according to the ISG control method of the present invention, a vehicle or a battery sensor without a battery sensor by including a step of determining an engine start type of a specific configuration, an initial start step, an ISG entry ready step, and an ISG entry prohibition step. It is possible to provide a control method for implementing the ISG function by judging the vehicle condition with only the minimum conditions such as vehicle and environment for a vehicle with a faulty failure.

In addition, according to an embodiment of the present invention, by including the step of entering the generator inspection to perform a specific process, it is possible to effectively detect the inspection status or the charging failure status of the generator during the ISG control operation, thereby effectively preventing the occurrence of safety accidents. I can.

In addition, according to an embodiment of the present invention, by including a jump start determination step that performs a specific process, it is possible to effectively detect whether the state of the vehicle is the jump start state while performing the ISG control operation, and at the same time request the ISG entry prohibition. By performing this, it is possible to prevent unwanted entry to the ISG from being performed, and as a result, it is possible to ensure effective operation of the vehicle.

In addition, according to an embodiment of the present invention, in the ISG entry ready step, when the charging voltage Vc is greater than or equal to the reference value, the minimum charging time is calculated, and the ISG entry ready is performed only when the calculated minimum charging time is greater than or equal to the reference value, By calculating the minimum charging time in real time and monitoring in real time whether the calculated minimum charging time is greater than or equal to the reference value, it is possible to effectively shorten the time required for ISG control, thereby implementing an efficient ISG control method. I can.

In addition, according to an embodiment of the present invention, by including an ISG restart regression step that controls the return to the ISG entry ready stage only under certain conditions, it is possible to implement an effective ISG function reflecting the state of the engine. If the state is a state in which the ISG function cannot be implemented, it can effectively respond to prevent the occurrence of safety accidents.

In the above detailed description of the present invention, only special embodiments according thereto have been described. However, it should be understood that the present invention is not limited to a particular form mentioned in the detailed description, but rather, it is understood to include all modifications, equivalents, and substitutes within the spirit and scope of the present invention as defined by the appended claims. Should be.

That is, the present invention is not limited to the specific embodiments and description described above, and any person having ordinary knowledge in the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims, various modifications are implemented. It is possible, and such modifications will fall within the protection scope of the present invention.

S100: ISG control method
S110: Engine start type determination step
S120: Initial start-up phase
S130: ISG entry ready phase
S140: ISG entry prohibition phase
S150: Generator check entry phase
S161: Jump start judgment step
S162: Jump start determination step
S170: ISG restart regression step
S180: The process of counting the number of ISG entries
S190: Forced charging step

Claims (13)

As a control method (S100) for implementing the ISG (idle stop & go) function of a vehicle without a battery sensor,
An engine start type determination step (S110) of determining whether the engine is initially started or is started by ISG;
In the engine start-up type determination step (S110), when the engine is initially started, the battery starting voltage (Vs) is measured by the engine controller (ECU), and the engine starts when the starting voltage (Vs) is higher than a preset reference voltage. Initial start-up step (S120) to perform;
After starting the engine, after measuring the charging voltage Vc by the engine controller (ECU), when the measured charging voltage Vc is greater than or equal to the reference value, an ISG entry ready step (S130) of performing an ISG entry ready (S130); And
After stopping the engine by the ISG function, when the voltage difference between the starting voltage (Vs) and the restart voltage (Vr) is less than the reference value, starting the engine and simultaneously performing an ISG entry prohibition request (S140);
ISG control method comprising a.
The method of claim 1,
The ISG control method (S100),
After starting the engine, if the charging voltage (Vc) is less than the reference value, the generator (alternator) inspection state or a state of defective charging output to the operator, and the generator inspection entry step (S150) to enter the inspection state;
ISG control method further comprising a.
The method of claim 1,
The ISG control method (S100),
After starting the engine, if the charging voltage (Vc) is less than the reference value, the amount of voltage change per unit time is measured by the engine controller (ECU), and if the measured value is compared with the starting voltage (Vs) and the voltage drop is confirmed, it is judged as a jump start. And, a jump start determination step (S161) of performing an ISG entry prohibition request;
ISG control method further comprising a.
The method of claim 1,
The ISG control method (S100),
After starting the engine, if the charging voltage (Vc) is less than the reference value, the current generation voltage is measured in real time by the engine controller (ECU), and the voltage is not stabilized within a preset time and the voltage rises and falls in conjunction with the engine speed. If it occurs, it is determined as a jump start due to insufficient battery capacity, and a jump start determination step (S162) of performing an ISG entry prohibition request;
ISG control method further comprising a.
The method of claim 1,
In the ISG entry ready step (S130), when the charging voltage Vc is greater than or equal to the reference value, the minimum charging time is calculated by the engine controller (ECU), and the ISG entry ready is performed only when the calculated minimum charging time is equal to or greater than the reference value. ISG control method characterized by.
The method of claim 5,
If the calculated minimum charging time is less than the reference value, the minimum charging time is calculated in real time by the engine controller (ECU), and the calculated minimum charging time is monitored in real time to see if it is more than the reference value, and at the same time, the ISG entry ready is not performed. ISG control method characterized by.
The method of claim 6,
ISG control method, characterized in that the process of calculating the minimum charging time in real time and monitoring in real time whether the calculated minimum charging time is greater than or equal to a reference value is performed only at initial startup.
The method of claim 1,
The ISG control method (S100),
If the voltage difference between the starting voltage (Vs) and the restart voltage (Vr) measured by the engine controller (ECU) is more than the reference value after stopping the engine by the ISG function, the current consumption voltage is calculated and calculated by the engine controller (ECU). When the consumed voltage is greater than or equal to the reference value, an ISG restart regression step (S170) of performing an ISG entry ready step (S130) after starting the engine;
ISG control method further comprising a.
The method of claim 8,
In the ISG restart regression step (S170), when the voltage difference between the starting voltage (Vs) and the restart voltage (Vr) measured by the engine controller (ECU) is greater than or equal to a reference value, a reference voltage that can be started is calculated and calculated. If the reference voltage is less than the restart voltage (Vr), after performing the engine start, ISG control method comprising the step of performing the ISG entry ready step (S130).
The method of claim 8,
The ISG restart regression step (S170) further comprises a process (S180) of counting the number of ISG entries.
The method of claim 1,
The ISG control method (S100),
Compulsory charging execution step (S190) of calculating the number of ISG entry and performing a forced charging when the calculated number of ISG entries exceeds a preset reference value;
ISG control method further comprising a.
The method of claim 1,
In the initial starting step (S120), the ISG control method, characterized in that the preset reference voltage compared to the starting voltage (Vs) is a preset value calculated in proportion to the engine coolant temperature.
The method of claim 5, 6 or 7,
The ISG control method, characterized in that the preset reference value compared with the calculated minimum charging time is a preset value calculated in proportion to the battery voltage and the generator voltage at startup.

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