KR20150071440A

KR20150071440A - Controlling method of idle stop section for ISG

Info

Publication number: KR20150071440A
Application number: KR1020130158479A
Authority: KR
Inventors: 권건오
Original assignee: 현대자동차주식회사
Priority date: 2013-12-18
Filing date: 2013-12-18
Publication date: 2015-06-26
Also published as: KR101567162B1

Abstract

The present invention relates to a method for controlling an idle stop section of an ISG. The method comprises: a first step (S10) which particularly determines a vehicle operating speed; a second step (S20) which is operated in a normal operation mode if the vehicle speed is higher than 30km/h in the first step (S10); a third step (S30) which is operated in an idle stop mode if the vehicle speed is lower than 30km/h in the first step (S10); and a fourth step (S40) which is operated in an operation suspending mode if vehicle speed is 0km/h in the first step (S10), therefore the vehicle enters an idle stop mode from the point where the vehicle speed is lower than 30km/h, thereby improving marketability through an improvement of fuel efficiency by more than 5% when operating the vehicle in a low speed traffic situation as in the center of a city.

Description

[0001] The present invention relates to an idle stop section for an ISG,

The present invention relates to an idle stop section control method of an ISG, and more particularly, to an idle stop section control method of an ISG for increasing fuel idling by increasing an idle stop section in an ISG structure.

Generally, ISG (Idle Stop and Go) is a system developed to improve fuel efficiency. It automatically stops the engine after a few seconds from the stop of the vehicle and automatically performs the operation without the operation of the ignition key when the driver's will is detected .

That is, when the engine enters the idle (idle) stop mode in a slow-moving state where the engine is stopped or repeatedly stopped to wait for a signal during driving, when the engine is turned off and the driver's willingness to restart is detected, The fuel consumption loss due to unnecessary idling can be prevented.

However, since the conventional ISG system enters the idle stop mode only in the vehicle stop state, the effect of improving the fuel economy is limited.

Patent 1: Korean Patent Publication No. 10-2010-0064773

An object of the present invention is to provide an idle stop section control method of an ISG for solving the above problems, and in particular, to increase fuel idling by increasing an idle stop section in an ISG structure.

The present invention includes a first step of determining a vehicle traveling speed; A second step of operating in a normal traveling mode when the vehicle speed is 30 km / h or more in the first step; A third step of operating in an idle stop mode when the vehicle speed is less than 30 km / h in the first step; And a fourth step of operating in a travel stop mode when the vehicle speed is 0 km / h in the first step.

In the second step, in the normal traveling mode in which the vehicle speed is 30 km / h or more, the first switch that connects the DC converter and the 12V battery is turned ON, and the second switch that connects the 48V energy portion and the HSG formed by the generator- And a second step of turning off the switch.

The second mode of operation is to maintain the fuel supply after the second stage and to operate the operation mode of the HSG in the generator mode to supply electric power to the electrical equipment of the vehicle and to change the operation mode of the DC converter from 48V to 12V, It is preferable to include two steps.

And a third step of turning off the first switch and turning on the second switch in the idle stop mode in which the vehicle speed is less than 30 km / h in the third step.

A step 3-2 of determining an accelerator signal of the vehicle after the step 3-1; A third step of supplying fuel when the accelerator signal is ON in step 3-2 and operating the operation mode of the HSG as a restarting motor; And (3-2) when the accelerator signal is OFF in the step 3-2, the operation mode of the HSG is operated in the engine crankshaft deceleration control mode to mitigate the impact due to the fuel cutoff desirable.

It is preferable to further include a step 3-5 of interrupting the supply of the fuel when the accelerator signal is OFF in step 3-4, and notifying the passenger of the entry into the idle stop mode by voice or text.

(3-6) of determining the voltage of the 48V energy part in the step 3-4; If it is determined that the voltage of the 12V battery is lower than the reference voltage when the voltage of the 48V energy unit exceeds the reference value in the 3-6 step; If the 12V battery voltage is below the reference level, the first switch is turned on and the power source of the 48V energy unit is applied to the 12V battery to change the operation mode of the DC converter from 48V to 12V. It is preferable to further include a step.

If the voltage of the 48V energy part is lower than the reference voltage, the operation goes to the step 3-3. If the voltage of the 12V battery is higher than the reference voltage, .

In the fourth step, in the case of the travel stop mode in which the vehicle speed is 0 km / h, it is preferable to further include a fourth step of determining whether the brake switch OFF and the shift lever D step condition are satisfied at the same time.

If the condition is satisfied in the step 4-1, the process moves to the step 3-3, and if the condition is unsatisfactory, the vehicle is recognized as being stopped and the logic is terminated.

The present invention as described above is an invention having an effect of improving the fuel efficiency by improving the fuel efficiency of 5% or more when traveling in the low-speed slow-motion congestion zone of the city because the vehicle speed enters the idle stop mode from the point of less than 30 km / h.

1 is a flowchart showing an idle stop interval control method of the ISG of the present invention,
FIG. 2 is a schematic diagram showing a second step in the idle stop interval control method of the ISG of the present invention;
3 is a schematic diagram showing a third step in the idle stop interval control method of the ISG of the present invention.
4 is a schematic diagram showing a fourth step in the idle stop interval control method of the ISG of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, the idle stop interval control method of the present invention includes a first step S10 for determining a vehicle speed, a second step S20 for operating in a normal driving mode, A third step S30 of operating in a mode, and a fourth step S40 of operating in a travel stop mode.

As shown in FIG. 1, the first step S10 is a step of determining the traveling speed of the vehicle. The second step S20, the third step S30, or the third step S30, The process proceeds to step S40.

The second step S20 is a step of operating the vehicle in the normal traveling mode when the vehicle speed is 30 km / h or more in the first step S10, and allows a general driving situation to be performed.

2 to 4, the HSG 20 is connected to the engine 10 through a crankshaft S, and the HSG 20 is connected to the engine 10 via a DC (direct current) Converter 30 and is connected to the 48V energy unit 50 through the second switch 62 and the DC converter 30 is connected to the 12V battery 40 through the first switch 61. [

1 and 2, in the case of the normal driving mode in which the vehicle speed is 30 km / h or more in the second step S20, the first switch 61 is turned on and the second switch 62 is turned off It is preferable to include step 2-1 (S21).

In step 2-1 (S21), the fuel supply is maintained, and the operation mode of the HSG 20 is operated in the generator mode to supply electric power to the vehicle electrical components such as the engine room box and the indoor box, And a second-2 step (S22) for changing the operation mode of the converter 30 from 48V to 12V.

The third step S30 is a step of operating the vehicle in the idle stop mode when the vehicle speed is less than 30 km / h in the first step S10, and the ISG is ready to enter the idle stop condition.

1 and 3, in the idle stop mode in which the vehicle speed is less than 30 km / h in the third step S30, the first switch 61 is turned off and the second switch 62 is turned on It is preferable to include step 3-1 (S31).

If the accelerator signal is ON in the 3-2 step (S32) and the 3-2 step (S32) in which the accelerator signal of the vehicle is judged after the 3-1st step S31, (Step S33) of supplying fuel and operating the operation mode of the HSG 20 as a restarting motor, and when the accelerator signal is OFF in step 3-2 (S32) (Step S34) of operating the operation mode of the HSG 20 in the engine crankshaft deceleration control mode so as to enter the idle stop state because there is no vehicle acceleration will to mitigate the impact due to the fuel cutoff .

In addition, it is preferable to include step 3-5 (S35) of shutting off fuel supply when the accelerator signal is OFF in step 3-4 (S34) and informing the passenger of the entry into the idle stop mode by voice or letter.

On the other hand, in the 3-4 step S34, the voltage of the 48V energy unit 50 is determined in the steps of S36 and S36 to determine the voltage of the 48V energy unit 50, If the voltage of the 12V battery 40 is less than the reference value, the third switch S37 and the third switch S37 determine whether the voltage of the 12V battery 40 is lower than the reference value. (Step S38) that the power source of the 48V energy unit 50 is applied to the 12V battery 40 and the operation mode of the DC converter 30 is changed from 48V to 12V .

In this case, if the voltage of the 48V energy unit 50 does not exceed the reference value, that is, if the voltage of the 48V energy unit 50 is lower than the reference value in the step 3-6 (S36), the operation goes to the step 3-3 (S33). That is, when the voltage of the 48V energy unit 50 is detected to be below the reference level, the further deceleration control of the crankshaft S using the HSG 20 becomes impossible. Therefore, the HSG 20 operates as the restarting motor So that engine cranking is prepared and the fuel supply is made so that the engine can be restarted. After the restart, the first switch 61 is turned on again and the second switch 62 is turned off again so that the operation mode of the HSG 20 is operated in the generator mode and the DC converter 30 is turned on at 48 V It is transformed to 12V so that electric power can be supplied to the electric device.

On the other hand, if the voltage of the 12V battery 40 exceeds the reference value in the step 3-37 (S37), the process moves to the initial first step S10 so as to be in a standby state for the logic of the present invention.

The fourth step S40 is a step of operating in the travel stop mode when the vehicle speed is 0 km / h in the first step S10.

In this case, as shown in FIGS. 1 and 4, in the case of the travel stop mode in which the vehicle speed is 0 km / h in the fourth step S40, it is determined whether or not the conditions of the brake switch OFF and the shift lever D are satisfied at the same time (S41).

If the condition is satisfied in the 4-1st step (S41), the process moves to the 3-3 step (S33). That is, when the condition is satisfied, the brake switch is OFF and the shift lever is located at the D-stage, which means that the driver wants to move the vehicle, so the fuel supply for the engine cranking operation is started and the HSG 20 starts the engine So that it is possible to maintain normal driving condition conditions.

On the other hand, when the condition is unsatisfactory in the step 4-1 (S41), the vehicle is recognized as being stopped and the logic is terminated.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

S10: First step S20: Second step
S30: Third step S40: Fourth step

Claims

A first step of determining a vehicle traveling speed;
A second step of operating in a normal traveling mode when the vehicle speed is 30 km / h or more in the first step;
A third step of operating in an idle stop mode when the vehicle speed is less than 30 km / h in the first step;
And a fourth step of operating in a travel stop mode when the vehicle speed is 0 km / h in the first step.

The method according to claim 1,
In the second step, in the normal traveling mode in which the vehicle speed is 30 km / h or more, the first switch that connects the DC converter and the 12V battery is turned ON, and the second switch that connects the 48V energy portion and the HSG formed by the generator- And a second step of turning OFF the switch of the ISG.

The method of claim 2,
The second mode of operation is to maintain the fuel supply after the second stage and to operate the operation mode of the HSG in the generator mode to supply electric power to the electrical equipment of the vehicle and to change the operation mode of the DC converter from 48V to 12V, The method of claim 1, further comprising:

The method of claim 2,
Further comprising a third step of turning off the first switch and turning on the second switch in the idle stop mode in which the vehicle speed is less than 30 km / h in the third step. Way.

The method of claim 4,
A step 3-2 of determining an accelerator signal of the vehicle after the step 3-1;
A third step of supplying fuel when the accelerator signal is ON in step 3-2 and operating the operation mode of the HSG as a restarting motor;
And (3-2) when the accelerator signal is OFF in step 3-2, the operation mode of the HSG is operated in the engine crankshaft deceleration control mode to mitigate the impact due to the fuel cutoff Of the ISG.

The method of claim 5,
Stopping the supply of the fuel when the accelerator signal is OFF in step 3-4, and notifying the passenger of the arrival of the idle stop mode by voice or by letter. The idle stop interval control method of the ISG .

The method of claim 5,
(3-6) of determining the voltage of the 48V energy part in the step 3-4;
If it is determined that the voltage of the 12V battery is lower than the reference voltage when the voltage of the 48V energy unit exceeds the reference value in the 3-6 step;
If the 12V battery voltage is below the reference level, the first switch is turned on and the power source of the 48V energy unit is applied to the 12V battery to change the operation mode of the DC converter from 48V to 12V. Further comprising the step of: determining whether the idle stop interval is equal to or greater than a predetermined threshold value.

The method of claim 7,
If the voltage of the 48V energy part is lower than the reference voltage in the step 3-6, the operation goes to the step 3-3,
And if the voltage of the 12V battery exceeds the reference voltage in the step 3-7, the operation proceeds to the first step.

The method of claim 4,
And a fourth step of determining whether the brake switch OFF and the shift lever D step condition are simultaneously satisfied in the case of the travel stop mode in which the vehicle speed is 0 km / h in the fourth step. Way.

The method of claim 9,
If the condition is satisfied in the step 4-1, the process moves to the step 3-3, and if the condition is unsatisfactory, the vehicle is recognized as being stopped and the logic is terminated.