KR101744985B1 - ISG Control Method for Preventing Abnormal Engine Start - Google Patents

Abstract

The present invention can be applied to an idle stop and go logic with a clutch ON signal or a key start ON signal or an intake air amount detection signal together with a vehicle speed < 1 KPH and an engine revolution number & The abnormal engine start prevention logic in which the ISG stop determination is once again verified by using the signal information value is added to thereby surely prevent the abnormal start of the engine from being unintended by the driver, The state of the engine is stopped when it is required to switch to the state, and the reliability of the idle stop and go logic can be greatly enhanced.

Description

{ISG Control Method for Preventing Abnormal Engine Start}

The present invention relates to an idle stop and go control, and more particularly to an idle stop control method capable of preventing an abnormal start of an engine, which may occur when the vehicle is not in a neutral state, will be.

In general, the idle stop and go function is an idle stop control of the engine, and the fuel economy can be realized by repeatedly executing the operation of turning off the engine or performing the key operation according to the drawing conditions.

In the idle stop and go function, the abnormal start of the engine, which is not intended by the driver, must be prevented, and a control circuit using the ECU is configured for this purpose.

Such a control circuit of the idle stop and go normally constitutes a start relay circuit between the ECU and the battery and the motor so that the engine can be started only when the neutral signal of the vehicle is sensed, It is possible to prevent abnormal start of the engine.

Fig. 2 shows a control circuit having a start relay circuit for preventing an abnormal engine start.

As shown in the figure, the control circuit includes an ECU 1 for determining an engine state through various sensors, a neutral switch element (not shown) installed on a line leading from the ground GND to the ECU 1 And a start relay element 3 which is installed in a line connected to the ECU 1 to supply battery power to the motor 4 and sensed by the ECU 1. [

As described above, since the control circuit of the idle stop and go further includes the neutral switch element 2, the ECU 1 can start the engine only when the neutral signal that senses the neutral state of the vehicle is activated It is possible to prevent the abnormal start of the engine (Abnormal Start).

However, the neutral switch element 2 of the control circuit has a problem in that when a circuit breakage Ka occurs between the ground and the ECU 1 or when a disconnection line Kb between the battery and the motor 4 is generated, ) Can not be prevented.

This means that even if the idle stop and go control circuit is equipped with the neutral switch element 2, the driver's unintended abnormal start of the engine can not be completely prevented.

On the other hand, Fig. 3 shows another control circuit for preventing an abnormal engine start (Abnormal Start).

As shown in the figure, the control circuit further includes an ISG relay element 5 in the control circuit configuration of FIG. 2, thereby preventing an abnormal start of the engine.

The ISG relay element 5 forms a power supply circuit for applying the power supply of the start relay element 3 through the neutral switch element 2 so that when a disconnection Ka is generated between the ground and the ECU 1 The power source of the start relay element 3 can be supplied to the motor 4 by the ISG relay element 5.

In this case, the ISG relay element 5 can stably maintain the battery power supplied to the motor 4, thereby preventing the abnormal start of the engine.

However, even when the idle stop and go control circuit is equipped with the double neutral switch element 2 and the ISG relay element 5 as described above, when the disconnection line Kb between the battery and the motor 4 is generated There is a limit that can not prevent the abnormal engine starting (Abnormal Start).

Therefore, even if the idle stop and go control circuit makes a hardware multiple configuration of the safety element, if the physical damage such as the circuit break (Kb) between the battery and the motor 4 can not be prevented, The abnormal start of the engine can not be completely prevented.

The present invention, which has been made in view of the above-mentioned problems, has an object of providing a vehicle speed control apparatus and a vehicle speed control method for a vehicle in which an unintentional unsteady state of a driver is detected in a software manner by using an information value such as a clutch, intake air amount, vehicle speed, By preventing the engine starting (Abnormal Start), it is possible to stably prevent the abnormal engine starting when the engine stop is required even in the case of the hardware failure of the control circuit, and also to prevent the abnormality And an object of the present invention is to provide an eye control method for preventing engine startup.

In order to accomplish the above object, the present invention provides an ISG control method for preventing an abnormal engine start, comprising: an ISG stop step of recognizing an ISG stop state according to an idle stop and go logic condition;

A condition part for judging whether or not a failure occurs in the start relay circuit of the ISG control circuit when the ISG stop step is executed;

A condition establishing step of determining whether a current vehicle speed and an engine speed are detected and a value necessary for switching an ISG stop state if the start relay circuit is normal when the conditional step is executed;

Wherein when the value required for switching the ISG stop state is satisfied at the time of executing the condition establishing step, it is possible to operate the braking section of the vehicle using the vehicle state information value acquired from the sensor together with the current vehicle speed and the engine speed detection value A condition executing step of calculating a control value;

An ISG stop which meets a condition to stop the vehicle by operating the braking unit with the control value outputted in the execution of the condition execution step and to switch to the ISG stop state according to the Idle Stop and Go logic condition Establishing step;

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The fuel injection is stopped when the start relay circuit fails (Fail) in the conditional step.

In the condition establishing step, a value required for switching the ISG stop state is set to a vehicle speed < 1 KPH and an engine speed > 300 RPM.

In the condition execution step, the vehicle state information value includes a clutch ON signal, a key start ON signal, and an intake air amount detection signal information value.

In the condition execution step, the control value includes a clutch ON signal or a key start signal, which is the vehicle state information value, together with the vehicle speed < 1 KPH and the engine revolution number & (Key Start) On signal or the intake air amount detection signal information value.

The information value of the vehicle speed < 1 KPH and the engine speed > 300 RPM is input to the AND element, and the clutch ON signal information value or the key start ON signal information value or the intake air amount detection The signal information value is input to the OR element, and the control value is calculated using the AND element and the logic circuit through the OR element.

The present invention can prevent an unintentional abnormal start of the engine from occurring by preventing the unintentional engine start from occurring by using the current vehicle speed and the engine speed together with the information such as the clutch, intake air amount, vehicle speed and engine speed (RPM) So that it does not increase the cost due to the additional hardware.

In addition to the hardware configuration using the relay circuit for preventing an unexpected abnormal engine start of the driver, the present invention further enhances the reliability by reinforcement of the software logic.

FIG. 1 is a flowchart of an eye control method for preventing an abnormal engine start according to the present invention, and FIGS. 2 and 3 are diagrams of a conventional eye control circuit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

Fig. 1 shows a method of controlling an eye for controlling an abnormal engine start according to the present embodiment. The control circuit for executing the eye control method includes an idle Stop and Go) control circuit.

As shown, the control logic for preventing the driver from unintended abnormal engine start (Abnormal Start) is executed when switching to the ISG Stop state of Idle Stop and Go as in step S10 .

In step S20, it is determined whether or not the engine is stopped by determining whether the start relay element 3 constituting the control circuit is failed or not. If it is determined that the engine fails, the failure of the start relay element 3 ), The process proceeds to step S30 where the engine is stopped by stopping the fuel injection.

However, if it is determined that the failure of the starter relay device 3 is not a failure, the process goes to step S40 to determine the vehicle speed and the engine speed RPM of the current vehicle, .

At this time, if the vehicle speed is greater than 1 KPH and the engine speed is less than 300 RPM, feedback is returned to step S10 until the condition of S40 is satisfied.

On the other hand, when the vehicle speed is less than 1 KPH and the engine speed is greater than 300 RPM, the engine is not stopped and the possibility of abnormal engine start (Abnormal Start) is determined as in step S50.

The abnormality engine startup possibility determination is performed through the ECU logic circuit A. The ECU logic circuit A receives information values (vehicle speed < 1KPH, engine revolution speed > 300RPM) for the vehicle speed and the engine speed And calculates a logical value using the detected and measured vehicle state information value (a).

The ECU logic circuit A is a conventional logic circuit composed of AND elements and OR elements as basic elements and receiving these signal values and outputting control values. The ECU logic circuit A includes a control circuit Value is transmitted to the braking portion B of the vehicle, and the braking portion B is operated according to the result.

In this embodiment, the information value (vehicle speed <1 KPH, engine speed> 300 RPM) of the vehicle speed and the engine speed is input to the AND element of the ECU logic circuit A, and the vehicle state information value .

The vehicle state information value a is an intake air amount detection signal together with a clutch ON signal and a key start ON signal, and the intake air amount detection signal means that the air amount> 0.

As described above, the ECU logic circuit A uses the clutch ON signal, the key start ON signal or the intake air amount detection signal together with the vehicle speed < 1 KPH / engine revolution speed > 300RPM information value Thereby outputting the control value.

The control value outputted through the ECU logic circuit A means that there is a possibility of an abnormal engine start (Abnormal Start).

The control value output from the ECU logic circuit A by the execution of step S50 is transmitted to the braking section B and the braking section B which has received the control value sequentially executes the logic as in steps S60 and S70, It is possible to prevent the abnormal start of the engine from occurring.

The braking portion B is described as being limited to the ABS / ESP, but usually refers to all kinds of electronic braking devices.

Step S60 means that the control value from the ECU logic circuit A is transmitted to the ABS / ESP, which is the braking section B, by means of CAN communication, which is a vehicle network communication, so that the ABS / ESP is ready for operation.

Then, in step S70, ABS / ESP is activated to indicate that the vehicle is stopped and the engine is stopped.

Thus, the abnormal start of the engine can be prevented even if the engine is stopped according to the idle stop and go operating condition, so that the engine can be switched to the ISG stop state as in step S10.

As described above, when the clutch ON signal or the key start ON signal or the intake air amount detection signal is detected together with the vehicle speed < 1 KPH and the engine revolution number > 300 RPM information value in the idle stop and go logic When the abnormal engine start prevention logic in which the ISG stop determination is once again verified using the signal information value is added and the state is to be changed to the ISG stop state, the abnormal operation of the driver due to the unintended abnormal engine start Start) can be prevented.

This prevents the driver from unintentionally aborting the abnormal start of the engine. This can surely cause the engine to stop when the vehicle is to be switched to the ISG stop state, which causes the reliability of the idle stop and go logic Can be greatly increased.

1: ECU 2: Neutral switch element (NGS)
3: Start relay element 4: Motor
5: ISG relay element
A: ECU logic circuit a: Vehicle status information
B:

Claims (7)

An ISG stop step recognizing transition to an ISG Stop state according to an Idle Stop and Go logic condition;
A condition part for judging whether or not a failure occurs in the start relay circuit of the ISG control circuit when the ISG stop step is executed;
A condition establishing step of determining whether a current vehicle speed and an engine speed are detected and a value necessary for switching an ISG stop state if the start relay circuit is normal when the conditional step is executed;
Wherein when the value required for switching the ISG stop state is satisfied at the time of executing the condition establishing step, it is possible to operate the braking section of the vehicle using the vehicle state information value acquired from the sensor together with the current vehicle speed and the engine speed detection value A condition executing step of calculating a control value;
The vehicle is stopped by operating the braking unit with the control value output in the execution of the condition execution step, and the ISG stop that satisfies the condition of switching to the ISG stop state according to the idle stop and go logic condition Establishing step,
The value required for switching the ISG stop state is a vehicle speed information value and an engine speed information value and the vehicle state information value is a clutch on signal or a key start on signal or an intake air amount Wherein the braking unit is an electronic braking device and the electronic braking device is operated to stop the vehicle with the output of the control value.

2. The method according to claim 1, wherein the fuel injection is stopped when the start relay circuit fails in the conditional step.
2. The method according to claim 1, wherein the value required for switching the ISG stop state in the condition establishing step is smaller than 1 KPH for the vehicle speed and the engine speed is greater than 300 RPM. Way.
delete The method according to claim 1, wherein in the condition execution step, the vehicle speed is less than 1 KPH, and the engine speed is greater than 300 RPM.
The vehicle control system according to claim 1, wherein each information value of the vehicle speed and the engine speed is input to an AND element, and the clutch on signal value or the key start on signal information value or Wherein the intake air amount detection signal information value is input to the OR element and the control value is calculated using the AND element and the logic circuit through the OR element.
The method according to claim 1, wherein the electronic braking device is ABS or ESP.

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