KR20150107309A - Method for precharge resistance fail-safe of hybrid vehicle - Google Patents

Abstract

The present invention relates to a fail-safe method for preventing pre-charge resistance damage of a hybrid vehicle. Therefore, the present invention accesses a fail-safe logic that an error flag is displayed by a controller to light a warning light and display a system checking state under a pre-charging fail condition. Moreover, the present invention sets error delay time of a predetermined period to prevent a step (turning on/off operation of a pre-charge relay) after the restart preparation step from progressing during the error delay time in order to control an excessive start of the driver to rapidly induce an after-sale service.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fail safe method for pre-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fail safe method for preventing pre-charge resistance burn-out of a hybrid vehicle, and more particularly, to a fail safe method for preventing pre- And a fail-safe method for preventing pre-charge resistance burn-out.

Typically, the hybrid vehicle is driven using motor power using high-voltage battery power in addition to engine power.

When the vehicle is started, a high voltage power source is connected to the hybrid system by turning on the main relay to supply the high voltage battery power to the hybrid system including the motor.

However, when the main relay is directly turned on, a sudden current flow, that is, a battery is temporarily short-circuited at the moment of attaching the main relay, and a main relay sticking phenomenon occurs due to an inrush current flow. And the capacitor of the inverter to be damaged.

In order to prevent the deterioration of the main relay and the elements constituting the hybrid system, the precharge relay is used to delay the voltage rise of the high voltage battery and to prevent the sudden current flow, Thereby preventing the development and damage of elements constituting the hybrid system.

3 is a schematic system configuration diagram of a hybrid vehicle.

A high voltage battery 10 and an inverter 20 are electrically connected to each other and a main relay 12 and a precharge relay 14 between the high voltage battery 10 and the inverter 20 are turned on / And a capacitor 22 is connected to the front end of the inverter 20. [

Also, the main relay 12 is composed of a (+) stage main relay 12-1 and a (-) stage main relay 12-2.

At this time, the precharge resistor R is connected to the rear end of the precharge relay 14 to limit the amount of current flowing from the high voltage battery 10, and the magnitude of the current flowing according to the size of the precharge resistor R The specification of the precharge relay is determined based on the magnitude of the flowing current.

Therefore, when the vehicle is started, the controller first turns on the precharge relay 14 so that the power from the high voltage battery is first charged to the capacitor 22 while attenuating the current through the precharge resistor R, And prevents sudden current flow, thereby preventing the main relay from sticking and damage to the elements constituting the hybrid system.

Hereinafter, a normal starting process of the hybrid vehicle will be described with reference to FIG.

First, after the parking position ("P" Position), the brake switch ON ("Brake" Switch ON) and the smart button ON are confirmed after the ignition on step S101, the controller (HCU) enters the startup logic (S102).

If it is determined that there is no abnormality in the various controllers (MCU, GCU, etc.) (S103), if there is no abnormality, the high voltage relay ON sequence is entered and the precharge relay among the main relay and the precharge relay is first turned ON (S104).

Of course, the precharge relay is turned on and the (-) stage main relay is also turned on for the current flow of the high voltage battery (S105).

Therefore, the pre-charge relay is turned on and the current of the high-voltage battery flows through the pre-charge resistor to the inverter. At this time, the DC link voltage of the inverter is increased by a pre- Precharging is performed on the capacitor.

Next, after the time counting step S106 for a predetermined time (for example, 200 msec), the precharging state of the capacitor is determined (S107).

That is, it is determined whether or not the capacitor voltage CAP_volt is equal to or higher than a reference value (for example, 80%).

If the voltage of the capacitor is higher than the reference value, the main relay 12, that is, the (+) terminal relay is turned on (S108), and the precharge relay is turned off simultaneously (S108).

Accordingly, when the main relay is turned on, the high-voltage battery power is normally supplied to the hybrid system including the inverter and the motor. Then, "READY" is displayed (S110) Driving is performed (S111).

On the other hand, in the case of the precharging judgment condition, when the capacitor voltage CAP_volt is below the reference value, a precharging fail condition is caused because the capacitor is short-circuited.

When the precharging fail condition is satisfied, the precharge relay and the main relay are turned off (S112), the warning lamp ("Warning Lamp") is lit in the cluster (S113), the smart button is turned off (S114) State.

However, if the driver tries to restart in the fast on / off mode several times despite the restart inhibition in which the smart button is turned off, the pre-charge relay is repeatedly attached / dropped at the occurrence of a short circuit of the capacitor / Off condition, resulting in a significant increase in the amount of heat generated by the pre-charge resistor, which leads to a problem of resistance burnout, which leads to a problem of increased A / S maintenance parts and costs in the future.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a fail safe logic which allows a controller to enter an error flag, The present invention provides a fail safe method for preventing burn-out of a pre-charge resistor of a hybrid vehicle that can prevent the pre-charge resistance from being burned out.

It is another object of the present invention to provide a vehicle control system and a vehicle control system which allow a user to set an error delay time for a predetermined time after a precharging fail condition is entered and the precharge relay and the main relay are turned off, Even if an attempt is made to restart the vehicle, it is possible to prevent the driver from making too much start-up and to promptly perform the maintenance of the A / S by preventing the step after the re-start preparatory step (on / off operation of the pre- have.

According to an aspect of the present invention, Entering the startup logic after the startup preparation step is completed; A precharge relay and a main relay are turned on upon entering the startup logic; Determining a precharging fail condition for the capacitor when the precharge relay and the main relay are sequentially turned on; Turning off the pre-charge relay and the main relay in the controller when the precharging fail condition is satisfied, and displaying a pre-charge error flag; A precharging fail safe step of turning on a warning lamp informing the cluster that it is a precharging failure and indicating that the "system checking" is recognizable by the driver based on the precharging error flag; The present invention provides a fail safe method for preventing pre-charge resistance burn-out of a hybrid vehicle.

In particular, the precharging fail safe step further comprises: setting an error delay time of a predetermined time for preventing or delaying restart.

Preferably, after the starting preparation step, the step of determining whether or not there is an error delay time for precharging failsafe is further performed. If it is determined that the error delay time is not terminated, And the on / off operation of the precharge relay is interrupted, so that the current flow is blocked by the precharge resistor.

More preferably, the step of determining whether a pre-charge error flag is present before the pre-charge relay-on after the startup logic is further advanced is performed, and if a pre-charge error flag is determined to exist, a precharging fail- .

Through the above-mentioned means for solving the problems, the present invention provides the following effects.

First, when entering the precharging failure condition, the fail-safe logic is executed such that the controller displays an error flag to turn on the warning light and system check so that the driver can see the fail-safe logic. Therefore, it is possible to minimize the number of restarts and to prevent the precharge resistance from being burned down.

[0050] [50] First, when the precharge failure condition is entered and the precharge relay and the main relay are turned off and the warning light is turned on in the cluster, the error delay time is set to a predetermined time, The driver does not have to repeat the start preparatory step during the error delay time, thereby avoiding the repetitive re-start of the driver. Thus, / S maintenance can be induced.

1 is a flowchart illustrating a fail-safe method for preventing pre-charge resistance burn-out of a hybrid vehicle according to the present invention;
2 is a flowchart showing a normal startup process of the hybrid vehicle,
3 is a configuration diagram briefly showing a configuration of a hybrid system for explaining a precharging step of a hybrid vehicle.

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

1 is a flowchart illustrating a fail-safe method for preventing pre-charge resistance burn-out of a hybrid vehicle according to the present invention.

First, after the startup preparation step of turning on the smart button after confirming the parking position ("P" Position), the brake switch on ("Brake" Switch ON), etc. after the ignition on step (S201) (S203), it is determined whether there is an error delay time (S202).

If the smart button is turned on after confirming the parking position ("P" Position) and the brake switch ON ("Brake" switch ON), as described in detail below, (ERR_Delay_timer ≠ 0), the step after the start preparation step (the on / off operation of the precharge relay, etc.) does not proceed until the error delay time set by entering the logic, that is, the error delay time for preventing or delaying restart, do.

Therefore, the startup logic (S203) by the controller (HCU) after the startup preparatory step is not performed, and the driver eventually has to repeat only the above-described startup preparatory steps.

On the other hand, when the time delay time has elapsed (ERR_Delay_timer = 0), it is determined whether there is any abnormality in various controllers (MCU, GCU, etc.) (S204) ).

At this time, if there is a precharge error flag floating in the controller, the following precharge fail safe logic is entered immediately, while if there is no precharge error flag (PRECHAR_ERROR_FLAG = 0), high voltage relay on sequence is entered, The precharge relay is first turned on (S206), and at this time, the precharge relay is turned on for the current flow of the high voltage battery and the (-) main relay is also turned on (S207).

Therefore, the pre-charge relay is turned on and the current of the high-voltage battery flows through the pre-charge resistor to the inverter. At this time, the DC link voltage of the inverter is increased by a pre- Precharging is performed on the capacitor.

Next, after the time counting step S208 for a predetermined time (for example, 200 msec), the precharging state of the capacitor is determined (S209).

That is, it is determined whether or not the capacitor voltage CAP_volt is equal to or higher than a reference value (for example, 80%).

If the voltage of the capacitor is higher than the reference value, the main relay, the (+) terminal relay is turned on (S210) and the precharge relay is turned off simultaneously (S211).

Accordingly, when the main relay is turned on, high-voltage battery power is normally supplied to the hybrid system including the inverter, the motor, and the like, and "READY" is displayed (S212) Driving is performed (S213).

On the other hand, in the case of the precharging judgment condition, when the capacitor voltage CAP_volt is below the reference value, a precharging fail condition is caused because the capacitor is short-circuited.

When the precharging fail condition is satisfied, the controller turns off the precharge relay and the main relay (S214), and the precharge error flag (PRECHAR_ERROR_FLAG = 1) is turned on (S215).

Accordingly, the controller causes the warning lamp ("Warning Lamp") to light up in the cluster (S216) and the smart button is turned off (S217).

In addition, a message "SYSTEM CHECKING" is displayed on the display of the cluster or AVN system according to the precharge error flag floating in the controller (S218).

Accordingly, the driver recognizes a warning message indicating that the vehicle is in a freezing failure state, as well as a message indicating that the current system is being checked. Thus, the driver can easily recognize that the current vehicle state is in a non-driving state, It is possible to prevent burn-out.

That is, even if the smart button is turned off to inhibit the restart, if the driver attempts to restart the motor on the fast on / off mode several times, the precharging relay is repeatedly attached / The on / off condition becomes so that the heat generation amount of the pre-charge resistance is greatly increased to cause the burnout of the resistance. However, the driver recognizes a message indicating that the current system is being checked as well as the warning lamp of the cluster, It can be easily recognized that it is impossible, and the number of starting times can be minimized to prevent the precharge resistance from being burned out.

On the other hand, if the controller displays the precharge error flag (PRECHAR_ERROR_FLAG = 1), an error delay time of a predetermined time is set in order to prevent or delay the restart (S219).

If the error delay time is not terminated (ERR_Delay_timer? 0) after the start preparation step of turning on the smart button as described above, the error delay time is set, that is, the step after the start preparation step And the on / off operation of the precharge relay and the like) does not proceed.

Therefore, since the on / off operation of the precharge relay, including the entry of the startup logic by the controller HCU after the startup preparation step, is not performed, the current flow of the high-voltage battery can not be prevented by the precharge resistance, It is possible to prevent the pre-charge burn-out due to the prevention of the driver's accident, and the driver has to repeat the start preparation step during the error delay time, so that it is possible to avoid the repetitive re-start of the driver and induce prompt A / S maintenance.

10: High voltage battery
12: Main relay
12-1: (+) Step main relay
12-2: (-) Step main relay
14: Precharge relay
20: Inverter
22: Capacitor

Claims (6)

A start preparation step;
Entering the startup logic after the startup preparation step is completed;
A precharge relay and a main relay are turned on upon entering the startup logic;
Determining a precharging fail condition for the capacitor when the precharge relay and the main relay are sequentially turned on;
Turning off the pre-charge relay and the main relay in the controller when the precharging fail condition is satisfied, and displaying a pre-charge error flag;
A precharging fail safe step of turning on a warning lamp informing the cluster that it is a precharging failure and indicating that the "system checking" is recognizable by the driver based on the precharging error flag;
Wherein the pre-charge resistance of the hybrid vehicle is determined based on a difference between the pre-charge resistance and the pre-charge resistance.
The method according to claim 1,
The precharging fail safe step comprises:
Further comprising the step of setting an error delay time for a predetermined period of time to prevent or delay the restart of the hybrid vehicle.
The method according to claim 1,
Further comprising the step of determining whether there is an error delay time for precharging fail safe after the start preparation step.
The method of claim 3,
Wherein when the error delay time is not terminated, the start logic entry after the start preparation step is blocked and the on / off operation of the precharge relay is cut off, thereby blocking the current flow to the precharge resistor. Fail safe method for preventing pre-charge resistance burn-out.
The method according to claim 1,
Further comprising the step of determining whether a precharge error flag is present before precharge relaying after entering the start logic.
The method of claim 5,
And if the precharge error flag is determined to exist, a precharging fail safing step is performed. The fail safe method for preventing burn-out of a pre-charge resistor of a hybrid vehicle.

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