KR20170060434A

KR20170060434A - Apparatus and Method for controlling Idle Stop and Go function

Info

Publication number: KR20170060434A
Application number: KR1020150164873A
Authority: KR
Inventors: 임재완
Original assignee: 현대자동차주식회사
Priority date: 2015-11-24
Filing date: 2015-11-24
Publication date: 2017-06-01

Abstract

An idle stop and go (ISG) control device according to an embodiment of the present invention includes an engine; And a restart start-on signal generating unit for generating a restart start-on signal (a signal for stopping the restart of the engine in advance in the auto stop state) in accordance with the environment information while maintaining the engine in an auto stop state by executing an idle stop and go a controller for generating a restart pre-on signal; A start driver for generating a drive signal for restarting the engine in accordance with the restart start-on signal; And a starter motor for restarting the engine in response to the drive signal.

Description

[0001] ISG CONTROLLER AND METHOD [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vehicle control, and more particularly, to an apparatus and method for controlling an environment of a vehicle during a restart in an auto-stop state of an idle stop and go (ISG) function so as to restart the vehicle.

Efforts are being made to reduce the carbon dioxide concentration in the combustion of vehicles all over the world, and at the same time, there is also a way to improve the fuel efficiency of the vehicle in accordance with the high oil price era.

One approach to this endeavor is the ISG (Idle Stop & Go) system. In fact, it has been proven that the ISG system can reduce the amount of carbon dioxide generated in the vehicle and increase the fuel efficiency.

Here, the ISG system is an engine control system that stops the engine when the vehicle stops and prevents the engine from burning, and then drives the engine again when the vehicle rises to enable the vehicle to move.

Such an ISG system does not use the fuel because it does not perform engine combustion at the time of stopping the vehicle, and therefore it becomes possible to prevent the carbon dioxide concentration from being discharged while improving the fuel economy of the vehicle.

Such an ISG system includes a method of starting an engine using an electric motor and a method of starting an engine using a hydraulic motor. A common method for passenger cars is to use an electric motor as a starter.

In a commercial vehicle equipped with a large engine, the capacity and / or size of the motor / inverter is large and the cost is very high. On the other hand, a method of using a hydraulic motor using the mechanical force of hydraulic pressure is advantageous in terms of cost and / or layout, and is suitable for a commercial vehicle.

However, in the case of such an ISG system, there is a problem in that it gives a sense of heterogeneity at the time of departure when a rapid acceleration is required after restarting. In addition, there is a problem that a little time is required until restarting at the start.

1. Korean Patent Publication No. 10-2014-0061167 2. Japanese Laid-Open Patent No. 2009-264289

It is an object of the present invention to provide an apparatus and method for controlling an idle stop and go (ISG) that prevents a driver from feeling a sense of difference when restarting in an auto-stop state.

It is another object of the present invention to provide an ISG control apparatus and a method for eliminating a little time from a start to a restart.

In order to achieve the above object, the present invention provides an idle stop and go (ISG) control device that prevents a driver from feeling a sense of heterogeneity when restarting in an auto-stop state.

The ISG control device includes:

engine;

And a restart start-on signal generating unit for generating a restart start-on signal (a signal for stopping the restart of the engine in advance in the auto stop state) in accordance with the environment information while maintaining the engine in an auto stop state by executing an idle stop and go a controller for generating a restart pre-sinal;

A start driver for generating a drive signal for restarting the engine in accordance with the restart start-on signal; And

And a starter motor for restarting the engine in response to the drive signal.

Also, the restart start-on signal may be generated only during the vehicle braking state.

The vehicle braking state may be performed when an auto vehicle hold function is performed or when a brake pedal is selected.

The automatic vehicle hold function may be automatically selected when a predetermined time elapses after selecting the vehicle hold function selection button provided in the vehicle or after the brake pedal is selected after the ISG function is executed.

Also, the restart start-on signal may be generated before the accelerator pedal is selected.

Also, the controller may confirm whether the driver's seat door is opened or closed during the vehicle braking state before generating the restart start-on signal.

The environment information may be any one of traffic light information, forward vehicle presence information, navigation information, and PAS (Parking Assistant System) information.

In addition, the traffic light information may include an elapsed time at which the traffic light changes from a red signal to a blue signal.

The forward vehicle presence / absence information may include whether the front vehicle is on and off, such as a brake, and whether the front vehicle is moving.

The starter motor may be an electric motor or a hydraulic motor.

According to another embodiment of the present invention, there is provided an ISG function execution step of executing an idle stop and go (ISG) function to maintain an engine in an auto-stop state; An environment information acquiring step of the controller acquiring environmental information of the vehicle in the auto stop state; An on-signal generating step of generating a restart pre-on signal for turning on the engine in advance in the auto-stop state according to the environment information; A drive signal generating step for generating a drive signal for restarting the engine in accordance with the restart start pre-on signal; And a restarting step in which the starting motor restarts the engine in accordance with the driving signal.

In this case, the step of generating the on-signal includes checking whether the driver's seat door is opened or closed during the vehicle braking state before the controller generates the restart start-on signal.

According to the present invention, it is possible to operate smoothly when the driver desires a rapid acceleration after the signal is changed, thereby reducing the sense of heterogeneity at the start in the AUTO STOP state.

In addition, another advantage of the present invention is that the signal is changed so that the start-up time is shortened.

1 is a block diagram of an idle stop and go (ISG) control apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating an ISG (Idle Stop and Go) control process according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Should not.

Hereinafter, an apparatus and method for controlling an idle stop and go (ISG) according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an idle stop and go (ISG) control apparatus according to an embodiment of the present invention. Referring to FIG. 1, the ISG control apparatus 200 includes a controller 210, a parking assistance system (PAS) 220 that supports parking of the vehicle and detects front and rear obstacles, a navigation unit An accelerator pedal sensor 240 for sensing acceleration or non-acceleration of the accelerator pedal 241 and an accelerator pedal 241, a detection sensor 280 for sensing the opening and closing of the door of the vehicle, a brake pedal 271, A brake sensor 270 for detecting whether the vehicle is in a braking state or not, an image sensor 260 for recognizing the state of a signal lamp, a start driver 250 for performing restarting of the engine 290, 290 and a starter motor 251 for restarting the starter motor. 1, a transmission, a battery, a turn-on lamp, an oil pump, and the like are constituted for convenience of understanding.

The PAS 220 searches the parking available area using the detection information of the front and rear obstacles received through the distance measuring sensor 221 when the vehicle slowly passes beside the parking space and displays a parking locus for parking the vehicle to the parking available area . Thereafter, the driver is instructed to stop the vehicle and operate the vehicle within the normal range.

The controller 210 performs an idle stop and go (ISG) function to acquire environmental information of the vehicle while maintaining the engine 290 in an auto-stop state, and restarts the engine in the auto- And generates a pre-on restart start on signal. Here, the environment information may be traffic light information, forward vehicle presence information, navigation information, and PAS (Parking Assistant System) information.

The start driver 250 generates a drive signal for restarting the engine 290 in accordance with a restart start-on signal generated by the controller 210. [

The starter motor 251 performs a function of restarting the engine 290 in response to a drive signal generated from the starter driver 250. Generally, in the idle stop and go (IGS) function, the engine 290 stops the combustion and stops the driving when the vehicle is stopped. The manner in which the engine 290 is controlled to be in such an auto-stop state is a well-known technique, and a detailed description thereof will be omitted.

When the driver releases his / her foot from the brake pedal 270 and depresses the accelerator pedal 241 to start the vehicle in such an auto stop state, the brake sensor 270 and the accelerator pedal sensor 240 sense this driver operation, And transmits the auto-stop cancel signal to the controller 210. [

However, in one embodiment of the present invention, the engine 290 is released from the auto-stop state in advance according to the traffic light condition and / or the environment of the vehicle before the auto-stop cancel signal is generated so that the driver can foot the brake pedal 270 And the vehicle is driven as soon as the accelerator pedal 241 is depressed.

Therefore, the driver can not sense the sense of heterogeneity when he / she restarts from the traffic light after stopping. In other words, the traffic light signal changes from red to blue and then makes it run smoothly when you want to accelerate quickly. This is because there is no time from auto stop to re-start according to the ISG function.

Of course, in one embodiment of the present invention, a restart start-on signal for this restart is generated only during the vehicle braking state. That is, the vehicle can suddenly pop out due to restarting. Thus, a restart start pre-ON signal is generated only when the vehicle is completely braked.

This braking state is executed when the auto vehicle hold function is executed or when the brake pedal 271 is depressed by the driver. Here, the automatic vehicle hold function may be selected by selecting a vehicle hold function selection button provided separately in the vehicle. That is, when the driver selects the vehicle hold function selection button for executing the vehicle hold function in the vehicle, the vehicle can immediately be said to execute the automatic vehicle hold function.

Alternatively, the automatic vehicle hold function can be implemented in software. That is, the vehicle automatically executes the vehicle hold function when a predetermined time elapses after the brake pedal 271 is selected after the ISG function is executed. These nodals are already applied to the vehicle, so that further explanation will be omitted.

On the other hand, when the restart start pre-on signal is generated, the start driver 250 restarts the engine 290 through the start motor 251 to execute the restart pre-on signal. The starter motor 215 may be an electric motor or a hydraulic motor.

The engine 290 includes a continuously variable valve timing (CVVT), a double over head camshaft (DOHC), a continuous valve timing (CVT), a gasoline direct injection (GDI) (Common Rail Direct Injection, CRDI), High Direction Turbo Intercooler (HTI), Variable Geometry Turbocharge (VGT) engine, and LPi (Liquid Propane Injection) engine using gas as fuel.

The door open / close sensor 280 detects whether the door of the driver's seat is open or closed. The driver checks whether the driver's seat door is open or closed during the vehicle braking state before generating the restart start-on signal.

The restart start-on signal for restarting the engine 290 after the auto-stop according to the execution of the ISG function is generated in the following cases.

(1) Traffic light information: When a traffic light sensed by the image sensor 260 changes from a red signal to a blue signal, a re-start pre-on signal is generated.

(2) Presence or absence of forward vehicle: When the forward vehicle is sensed ahead by the image sensor 260 and / or the PAS 220, a rebooting pre-ON signal is generated at the moment when the front vehicle is moved as soon as the brake of the front vehicle is turned off.

(3) Navigation information: When the destination is set by the navigation unit 230, a restart start-on signal is generated by using the rotation and straightness information.

(4) PAS information: When an obstacle is detected in the front and rear of the auto stop by the PAS 220, a restart start pre-ON signal is not generated.

(5) Braking state: A restart start pre-ON signal is generated only when the brake pedal 271 is selected by the auto-stop state or by the brake sensor 270.

FIG. 2 is a flowchart illustrating an ISG (Idle Stop and Go) control process according to an embodiment of the present invention. Referring to FIG. 2, the controller 210 (FIG. 1) executes an idle stop and go (ISG) function to maintain the engine (290 in FIG. 1) in an auto-stop state (step S210).

It is confirmed whether or not the vehicle is in the braking state in the auto-stop state (step S220). Further, it is determined whether the vehicle is in the auto-hold state or the brake pedal 271 is operating. If it is determined in step S220 that the vehicle is not in the braking state, the auto-stop state is maintained.

Otherwise, if it is determined in step S220 that the driver's seat is in the braking state, it is checked whether the driver's seat door is open (step S230). In addition, the driver can open the door uneventfully during the braking state. Therefore, it is intended to protect the driver by preventing the vehicle from being restarted while the door is opened. Of course, this step can be applied not only to the driver's door but also to the opening and closing of other doors.

If the driver's door is open in step S230, the flow proceeds to the auto-stop maintenance step S210. On the other hand, if the door is not open in step S230, it is checked whether a destination is set in the navigation (step S240).

If it is determined in step S240 that the destination is set, if the route to the destination is straight ahead, check whether there is a remaining time counter of the current red traffic light, confirm that the remaining time counter is changed to blue traffic light for 1 second or less, (Steps S260, S270, and S251).

On the other hand, if it is determined in step S240 that the route to the destination is the left turn, it is confirmed that the left turn signal light has changed to blue (step S241).

On the other hand, if the destination is not set in step S240, it is checked whether the turn signal lamp is turned on (step S250). If it is determined in step S250 that the turn signal lamp is on, the flow advances to step S260. Otherwise, if it is determined in step S250 that the turn signal lamp is not turned on, the process proceeds to step S241.

After step S251, the controller 210 of FIG. 1 confirms whether a vehicle ahead exists by using the image sensor 260 and / or the PAS 220 (step S271).

If it is determined in step S271 that there is a preceding vehicle, it is checked whether the brake or the like of the preceding vehicle is off or moving. If it is confirmed, the engine 290 is restarted (steps S273, S275, S290).

Otherwise, if it is determined in step S271 that there is no preceding vehicle, the PAS 220 is used to check whether there is an obstacle ahead of the vehicle, and if there is no obstacle ahead, the engine 290 is restarted (steps S280 and S290).

FIG. 2 shows that the environment information of the vehicle such as traffic light information, forward vehicle presence information, navigation information, and PAS (Parking Assistant System) information is integrally connected and implemented. However, It is also possible to implement.

200: ISG control device
210:
220: parking assistant system (PAS) 221: distance measuring sensor
230: Navigation unit
240: accelerator pedal sensor 241: accelerator pedal
250: Operation driver 251: Starting motor
260: Image sensor
270: Brake sensor 271: Brake pedal
280: Door opening / closing sensor
290: engine

Claims

engine;
And a restart start-on signal generating unit for generating a restart start-on signal (a signal for stopping the restart of the engine in advance in the auto stop state) in accordance with the environment information while maintaining the engine in an auto stop state by executing an idle stop and go a controller for generating a restart pre-sinal;
A start driver for generating a drive signal for restarting the engine in accordance with the restart start-on signal; And
A starter motor for restarting the engine in accordance with the drive signal;
And an ISG control device.

The method according to claim 1,
Wherein the restart pre-on signal is generated only during a vehicle braking state.

3. The method of claim 2,
Wherein the vehicle braking state is performed when an auto vehicle hold function is executed or when a brake pedal is selected.

The method of claim 3,
Wherein the automatic vehicle hold function is automatically executed when a predetermined time elapses after selecting the vehicle hold function selection button provided in the vehicle or after the brake pedal is selected after executing the ISG function.

The method according to claim 1,
Wherein the re-start pre-on signal is generated before the accelerator pedal is selected.

3. The method of claim 2,
Wherein the controller confirms whether the driver's seat door is open or closed during the vehicle braking state before generating the restart start-on signal.

The method according to claim 1,
Wherein the environment information is any one of traffic light information, forward vehicle presence information, navigation information, and PAS (Parking Assistant System) information.

8. The method of claim 7,
Wherein the traffic light information includes an elapsed time at which the traffic light changes from a red signal to a blue signal.

8. The method of claim 7,
Wherein the forward vehicle presence / absence information includes information on whether the front vehicle is on and off, such as a brake, and whether the front vehicle is moving.

The method according to claim 1,
Wherein the starter motor is an electric motor or a hydraulic motor.

An ISG function execution step of causing the controller to perform an idle stop and go (ISG) function to maintain the engine in an auto-stop state;
An environment information acquiring step of the controller acquiring environmental information of the vehicle in the auto stop state;
An on-signal generating step of generating a restart pre-on signal for turning on the engine in advance in the auto-stop state according to the environment information;
A drive signal generating step for generating a drive signal for restarting the engine in accordance with the restart start pre-on signal;
A restarting step in which the starting motor restarts the engine in accordance with the driving signal;
Gt; ISG < / RTI >

12. The method of claim 11,
Wherein the restart pre-on signal is generated only during a vehicle braking state.

13. The method of claim 12,
Wherein the vehicle braking state is performed when an auto vehicle hold function is executed or when a brake pedal is selected.

14. The method of claim 13,
Wherein the automatic vehicle hold function is automatically executed when a predetermined time elapses after the vehicle hold function selection button provided in the vehicle is selected or the brake pedal is selected after the ISG function is executed.

12. The method of claim 11,
Wherein the re-start pre-on signal is generated before the accelerator pedal is selected.

13. The method of claim 12,
And generating the on-signal by checking whether the driver's seat door is opened or closed during the vehicle braking state before the controller generates the restart start-on signal.

12. The method of claim 11,
Wherein the environment information is any one of traffic light information, forward vehicle presence information, navigation information, and PAS (Parking Assistant System) information.

18. The method of claim 17,
Wherein the traffic light information includes an elapsed time at which the traffic light changes from a red signal to a blue signal.

18. The method of claim 17,
Wherein the front vehicle presence / absence information includes information on whether the front vehicle is on and off, such as a brake, and whether the front vehicle is moving.

12. The method of claim 11,
Wherein the starter motor is an electric motor or a hydraulic motor.