KR20230037400A - Failure diagnosis method for load in vehicle - Google Patents

Abstract

The present invention relates to a method for diagnosing a failure of a vehicle load. The method for diagnosing the failure of the vehicle load according to a preferred embodiment of the present invention, as the method for diagnosing the failure of the vehicle load driven by a high-side driver or a low-side driver, comprises: a comparison step of comparing an output terminal voltage of the vehicle load with a failure diagnosis table prepared in advance, and determining a current status of the vehicle load according to a comparison result; and a fault location determination step of controlling the high-side driver or the low-side driver for each current status, and determining a fault location according to whether an overcurrent occurs or whether the vehicle load operates based on a control result.

Description

Fault diagnosis method of vehicle load {FAILURE DIAGNOSIS METHOD FOR LOAD IN VEHICLE}

The present invention relates to a method for diagnosing a failure of a vehicle load.

The automatic transmission provided in the vehicle may perform automatic shifting according to the driving speed of the vehicle, the opening rate of the throttle valve, and the condition of the vehicle (eg, oil temperature, coolant temperature, intake air temperature, air amount, etc.). A push-pull solenoid is used as a load for load (LOAD).

In general, a push-pull solenoid is a one-way actuator that converts an electric signal into a linear motion, and a magnetic core and a plunger are installed on the same shaft. The actuator has an electromagnetic coil wound around a magnet core and a plunger in a cylindrical shape. The plunger is pushed to one side by the return spring and is installed apart from the magnet core by a predetermined distance. An opposite mechanism for operation is connected to one end of the plunger. At this time, when a current flows through the electromagnetic coil, the magnet core and the plunger are magnetized in the axial direction and attracted to each other and moved by a predetermined length to drive the mechanism connected to the other side.

A vehicle that normally operates with an automatic transmission detects whether the solenoid is out of order to provide stability, and if it is determined that the solenoid is out of order, it can enter the Limp Home Mode and continue driving to the repair center. making it possible

The push-pull solenoid operates by receiving current supplied through two high side channels (HS (High Side) 2ch) and one low side channel (LS (Low Side) 1ch).

Referring to FIG. 1 , in the conventional push-pull solenoid failure diagnosis technology, the control unit 10 checks the output voltage of each channel of the push-pull solenoid 40 to determine SCB (Short Circuit to Battery) and SCG (Short Circuit to Ground), and fault conditions including OL (Open Load) are diagnosed. At this time, an ADC (Analog Digital Converter) circuit is configured to check the output voltage of each channel of the push-pull solenoid 40 .

However, the conventional fault diagnosis technology requires a total of three ADC circuit configurations to diagnose one push-pull solenoid. In vehicles using a plurality of push-pull solenoids, there is a problem in that the entire circuit configuration becomes complicated as the configuration of the diagnostic ADC circuit increases.

In addition, as a plurality of resistance elements are used to configure a 3-channel pull-up/pull-down circuit, the size and cost of a printed circuit board (PCB) increase.

In addition, since a micro controller unit (MCU) with a large number of ports is required due to the use of a large number of ports, there is a problem in that the price of the MCU increases.

Republic of Korea Patent No. 10-1978349

Accordingly, the present invention has been devised in view of the above circumstances, and configures the entire circuit by applying one diagnostic ADC configuration and performing fault diagnosis of the push-pull solenoid using the voltage of the diagnostic ADC and a previously prepared fault diagnosis table. It is an object of the present invention to provide a method for diagnosing vehicle loads that reduces complexity and prevents cost increase.

In order to achieve the above object, a fault diagnosis method of a vehicle load according to a preferred embodiment of the present invention is a fault diagnosis method of a vehicle load driven by a high-side driver or a low-side driver, wherein the voltage of the output terminal of the vehicle load and the a comparison step of comparing prepared failure diagnosis tables and determining a current state of the vehicle load according to a comparison result; and a fault location determination step of controlling the high-side driver or the low-side driver for each current state and determining a fault location according to whether an overcurrent occurs or whether the vehicle load operates based on a control result. .

The vehicle load may be a solenoid having a first output terminal and a second output terminal connected to the high side driver and having a third output terminal connected to the low side driver.

Prior to the comparing step, a voltage sensing step of sensing a voltage of the third output terminal of the vehicle load may be further included, and the comparing step may compare the voltage of the third output terminal with the fault diagnosis table.

The failure diagnosis table may include SCB failure, normal, SCG failure, or OL failure.

The fault location determining step may include a low side control step of turning on the low side driver when the current state is an SCB failure in the comparison step; and a first overcurrent detection step of detecting whether an overcurrent occurs in a lowside port connected to the third output terminal when the lowside driver is turned on.

The fault location determination step may include a first fault determination step of determining that the low-side port has an SCB fault when an overcurrent occurs in the low-side port in the first overcurrent detection step; and a second failure determining step of determining that an SCB failure of a high side port connected to the first output terminal or the second output terminal is determined when an overcurrent does not occur in the low side port in the first overcurrent detecting phase. can do.

In the fault location determining step, when the current state is an SCG failure or an OL failure in the comparing step, a first high side for controlling to turn on a first high side switching element of the high side driver connected to the first output terminal control step; and a second overcurrent sensing step of detecting whether an overcurrent occurs in a first high side port connected to the first output terminal when the first high side switching element is turned on.

The fault location determining step may include a third fault determining step of determining that an SCG failure of the first high-side port occurs when an overcurrent occurs in the first high-side port in the second overcurrent detecting step. .

The fault location determination step may include turning on a second high-side switching element of the high-side driver connected to the second output terminal when overcurrent does not occur in the first high-side port in the second overcurrent detection step. a second high-side control step of doing; and a third overcurrent sensing step of detecting whether an overcurrent occurs in a second high side port connected to the second output terminal when the second high side switching element is turned on.

The fault location determining step may further include a fourth fault determining step of determining that the second high side port has an SCG fault when an overcurrent occurs in the second high side port in the third overcurrent detecting step. there is.

The fault location determination step may further include an operation determination step of determining whether the vehicle load is operating when overcurrent does not occur in the second high-side port in the third overcurrent detection step.

The fault location determination step may include: a fifth failure determination step of determining that the low-side port SCG failure occurs when the operation of the vehicle load is detected in the operation determination step; and a sixth failure determination step of determining an OL failure when the operation of the vehicle load is not sensed in the operation determination step.

In the voltage sensing step, the voltage of the diagnostic power supply passes through the first output terminal to which a first resistor for pulling up the voltage of the diagnostic power supply is connected or the second output terminal to which a second resistor to pull up the voltage of the diagnostic power supply is connected. When applied to the third output terminal, a voltage between a third resistor and a fourth resistor connected to the third output terminal and pulling down a voltage to ground may be sensed.

According to the fault diagnosis method of a vehicle load according to a preferred embodiment of the present invention, by applying one diagnosis ADC configuration and performing fault diagnosis of a push-pull solenoid using the voltage and fault diagnosis table of the diagnosis ADC, the overall circuit It has the effect of reducing configuration complexity and preventing cost increase.

1 is a schematic circuit diagram of a solenoid failure diagnosis device according to the prior art.
2 is a schematic circuit diagram of an apparatus for diagnosing a failure of a vehicle load according to a preferred embodiment of the present invention.
3 is a diagram for explaining a process of generating a failure diagnosis table according to a preferred embodiment of the present invention.
4 is a flow chart of a method for diagnosing a failure of a vehicle load according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, although preferred embodiments of the present invention will be described below, the technical idea of the present invention is not limited or limited thereto and can be modified and implemented in various ways by those skilled in the art.

2 is a schematic circuit diagram of an apparatus for diagnosing a failure of a vehicle load according to a preferred embodiment of the present invention.

Referring to FIG. 2 , an apparatus 100 for diagnosing a failure of a vehicle load according to a preferred embodiment of the present invention performs failure diagnosis of a load 200 used for automatic transmission of a vehicle, and includes a control unit 110, a high It includes a side driver 120, a low side driver 130, and an analog-to-digital converter 140.

The controller 110 may diagnose whether the vehicle load 200 is out of order before driving the vehicle load 200 . Here, the vehicle load 200 may be a push-pull solenoid, but is not limited thereto. A diagnostic power supply (V1) of approximately 5V for fault diagnosis of the vehicle load 200 is supplied to the first output terminal (out1) of the vehicle load 200 through each of the first high-side port (P1) and the second high-side port (P2). ) and the second output terminal out2. A first diode D1 and a first resistor R1 may be connected between the diagnostic power supply V1 and the first high-side port P1. A second diode D1 and a second resistor R2 may be connected between the diagnostic power source V1 and the second high side port P2. Also, a third resistor R3 and a fourth resistor R4 for diagnosing a failure of the vehicle load 200 may be connected between the low side port P3 and the ground.

When the voltage of the diagnostic power supply V1 is supplied to the vehicle load 200, the controller 110 may receive the voltage of the third output terminal out3 of the vehicle load 200 from the analog-to-digital converter 140. there is. Here, the analog-to-digital converter unit 140 may obtain a voltage corresponding to the third output terminal out3 of the vehicle load 200 by sensing the voltage between the third resistor R3 and the fourth resistor R4. .

The control unit 110 may diagnose whether the vehicle load 200 has a failure by using the voltage of the third output terminal out3 of the vehicle load 200 and a failure diagnosis table prepared in advance. Here, the failure diagnosis table may indicate a failure state for each voltage level of the third output terminal out3 of the vehicle load 200 . The fault state may include Short Circuit to Ground (SCG), Open Load (OL), Short Circuit to Battery (SCB), and Normal.

When a failure state is confirmed through the voltage of the third output terminal (out3) of the vehicle load 200 and the failure diagnosis table, the control unit 110 uses the high side driver 120 or the low side driver to accurately determine the location where the failure has occurred. (130) can be turned on (Turn On) control. The controller 110 may determine the location of the failure based on whether an overcurrent occurs in the high side driver 120 or the low side driver 130 and whether the vehicle load 200 is operating. Here, overcurrent generated in the high-side driver 120 or the low-side driver 130 may be sensed through a separate current sensor (not shown). The operation of the vehicle load 200 may be detected through a separate motion detection sensor (not shown). The operation of the vehicle load 200 may be a plunger movement when the vehicle load 200 is a solenoid.

The high-side driver 120 may include a plurality of switching elements for supplying a driving voltage to the vehicle load 200 . The plurality of switching elements may include a first high-side switching element SW1 and a second high-side switching element SW2. The first high-side switching element SW1 may be connected to the first output terminal out1 of the vehicle load 200 through the first high-side port P1. The second high-side switching element SW2 may be connected to the second output terminal out2 of the vehicle load 200 through the second high-side port P2.

The first high-side switching element SW1 and the second high-side switching element SW2, when the SCG failure state is confirmed through the voltage of the third output terminal out3 of the vehicle load 200 and the failure diagnosis table, the SCG Turn-on operation can be performed to determine the location of the failure.

In one embodiment, when an overcurrent is detected in the first high-side port P1 while the first high-side switching device SW1 is turned on, it may be determined that the first high-side port P1 has an SCG failure.

In one embodiment, when an overcurrent is detected in the second high-side port P2 while the second high-side switching device SW2 is turned on, it may be determined that the second high-side port P2 has an SCG failure.

The low side driver 130 may include a low side switching element SW3 for supplying a ground voltage to the vehicle load 200 . The low side switching element SW3 may be connected to the third output terminal out3 of the vehicle load 200 through the low side port P3.

The low-side switching element (SW3), when the voltage of the third output terminal (out3) of the vehicle load 200 and the failure diagnosis table of the SCB is confirmed, turns on to accurately determine the location of the SCB failure. can

In one embodiment, when an overcurrent is detected in the low-side port P3 while the low-side switching element SW3 is turned on, it may be determined that the SCB of the low-side port P3 has failed.

In one embodiment, if an overcurrent is not sensed in the low-side port P3 while the low-side switching element SW3 is turned on, it may be determined that the SCB failure of the high-side ports P1 and P2 occurs.

As described above, the analog-to-digital converter unit 140 may sense the voltage between the third resistor R3 and the fourth resistor R4. The analog-to-digital converter unit 140 may include a separate resistance element (not shown) and a capacitor (not shown) to protect input ports and stabilize input power. The analog-to-digital converter unit 140 may convert the analog sensing voltage into a digital value and transmit the converted digital value to the controller 110 . Through this, the control unit 110 may perform fault diagnosis of the vehicle load 200 using the voltage level converted to a digital value.

As described above, in the fault diagnosis apparatus 100 of a vehicle load according to a preferred embodiment of the present invention, as the analog-to-digital converter unit 140 is configured as a single unit, components are reduced compared to the prior art, thereby reducing the configuration complexity of the entire circuit and reducing cost. It has the effect of preventing rise.

3 is a diagram for explaining a process of generating a failure diagnosis table according to a preferred embodiment of the present invention.

Referring to FIG. 3 , the vehicle load 200 may include a circuit including inductors L3 and L4 and resistors R3 and R4. The fault diagnosis table may be generated by considering the voltages of the 'A' node, the 'B' node, and the 'C' node connected to the output terminal of the vehicle load 200 for each fault state.

Meanwhile, a first resistor R1 connected between the 'A' node and the power supply V1, a second resistor R2 connected between the 'B' node and the power supply V1, and an output terminal of the vehicle load 200 The sixth resistor R6 connected between R and the ground is a reference resistor and may have a resistance value of approximately 10K. The fifth resistor R5 is connected between node 'C' and the output terminal of the vehicle load 200, and may have a resistance value of approximately 42.4K.

In addition, a first capacitor C1 is connected between the 'C' node and the ground, and may have a capacitance value of approximately 10n. In addition, a second capacitor C2 is connected between the 'A' node and the ground, and may have a capacitance value of approximately 22nF. In addition, a third capacitor C3 is connected between the 'B' node and the ground, and may have a capacitance value of approximately 22nF.

Hereinafter, an example of the voltage at the measurement location for each failure state will be described.

Table 1 shows the voltage at the measurement location for each SCB fault condition.

fault condition measuring position A B C SCB A 13.5V 13.5V 13.5V B 13.5V 13.5V 13.5V C 13.5V 13.5V 13.5V A+B 13.5V 13.5V 13.5V A+C 13.5V 13.5V 13.5V B+C 13.5V 13.5V 13.5V A+B+C 13.5V 13.5V 13.5V

Referring to Table 1, when an SCB failure occurs, the same voltage (13.5V) is measured regardless of the location of the SCB failure and the voltage measurement location. This can be used to set the voltage level for the SCB failure state of the failure diagnosis table.

Table 2 shows the voltage at the measurement location for each SCG fault condition.

fault condition measuring position A B C SCG A 0V 700μV 350μV B 700μV 0V 350μV C 350μV 350μV 0V A+B 0V 0V 0V A+C 0V 350μV 0V B+C 350μV 0V 0V A+B+C 0V 0V 0V

Referring to Table 2, when an SCG failure occurs, various voltages are measured according to the SCB failure occurrence location and the voltage measurement location. However, two voltage levels are measured at the ‘C’ node. This can be used to set the voltage level for the SCG failure state of the failure diagnosis table.

Table 3 shows the voltage at the measurement location for each OL failure condition.

fault condition measuring position A B C OL A 5V 2.5V 2.5V B 2.5V 5V 2.5V C 5V 5V 0V A+B 5V 5V 0V A+C 5V 5V 0V B+C 5V 5V 0V A+B+C 5V 5V 0V

Referring to Table 3, when an OL failure occurs, at least two voltages are measured at individual measurement positions according to the OL failure occurrence position and the voltage measurement position. However, at the 'C' node, the voltage level according to the OL of the 'A' node and the 'B' node and the voltage level according to the OL of the other nodes are measured differently. This can be used to set the voltage level for the OL failure state of the failure diagnosis table.

Table 4 shows the voltage at the measurement location for each steady state.

situation measuring position Normal A B C 3.333V 3.333V 3.333V

Referring to Table 4, in the normal state, the same voltage (3.333V) is measured regardless of the voltage measurement position. This can be used to set the voltage level for the normal state of the fault diagnosis table.

Table 5 shows a failure diagnosis table.

SCG/OL Normal SCB ~2.8V 3.0~3.6V 4.5V~

Referring to Table 5, the fault diagnosis table may be prepared in consideration of the voltage level of the 'C' node in the fault state and normal state of Tables 1 to 4. The fault diagnosis table may indicate an SCG or OL state for a voltage level of about 2.8V or less, a normal state for a voltage level of 3.0 to 3.6V, and an SCB state for a voltage level of 4.5V or more. This fault diagnosis table may be used for fault diagnosis of the vehicle load 200 .

4 is a flow chart of a method for diagnosing a failure of a vehicle load according to a preferred embodiment of the present invention.

1 and 4 , a method for diagnosing a fault of a vehicle load according to a preferred embodiment of the present invention uses a voltage level of a third output terminal (out3) of a vehicle load 200 and a previously prepared fault diagnosis table. It is characterized in that the state is determined, the high side driver 120 or the low side driver 130 is additionally controlled, and the location of the failure is finally determined according to whether overcurrent occurs or whether the solenoid moves. The method for diagnosing a vehicle load failure may include steps S410 to S550.

First, in the voltage sensing step ( S410 ), the analog-to-digital converter unit 140 may sense the voltage of the third output terminal out3 of the vehicle load 200 . The vehicle load 200 may be a push-pull solenoid having at least three output terminals out1, out2, and out3. Here, a first resistor R1 that pulls up the voltage of the diagnostic power supply V1 may be connected to the first output terminal out1. In addition, a second resistor R2 for pulling up the voltage of the diagnostic power supply V1 may be connected to the second output terminal out2.

When the voltage of the diagnostic power supply V1 is applied to the third output terminal out3 via the first output terminal out1 or the second output terminal out2, the analog-to-digital converter unit 140 outputs the voltage to the third output terminal out3. A voltage between the third resistor R3 and the fourth resistor R4 connected to pull down the voltage to the ground may be sensed.

The analog-to-digital converter unit 140 may convert the analog sensing voltage into a digital value and transmit the converted digital value to the controller 110 .

In the comparison step ( S420 ), the control unit 110 may compare the voltage of the third output terminal (out3) of the vehicle load 200 with a previously prepared failure diagnosis table. The controller 110 may determine the current state of the vehicle load 200 according to the comparison result. The current state may include SCB failure, normal, SCG failure, or OL failure.

After the comparison step (S420), the controller 110 controls the high-side driver 120 or the low-side driver 130 for each current state, and determines whether an overcurrent has occurred or whether the vehicle load has operated based on the control result. According to this, the location of the failure can be determined. This failure location determination step may include steps S430 to S550.

In the low-side control step (S430), the control unit 110 determines the low-side switching element of the low-side driver 130 ( SW3) can be turned on. At this time, a current flowing through the low-side port P3 may be sensed through a separate current sensing device (not shown).

In the first overcurrent detection step ( S440 ), the controller 110 may determine whether the current flowing through the low side port P3 is an overcurrent. The controller 110 may determine whether the current is overcurrent by considering whether the current flowing through the low side port P3 exceeds a predetermined reference current. The reference current may be set according to the user's needs.

In the first failure determination step S450, the control unit 110 may determine that the SCB failure of the low side port P3 occurs when an overcurrent occurs in the low side port P3.

In the second failure determination step S460, the controller 110 may determine that the SCB failure of the high side ports P1 and P2 occurs when the overcurrent does not occur in the low side port P3.

Meanwhile, in the first high-side control step (S470) after the comparison step (S420), the controller 110 determines whether the current state of the vehicle load 200 is SCG or OL failure through the comparison result of the comparison step (S420). , the first high-side switching element SW1 of the high-side driver 120 may be turned on. At this time, a current flowing through the first high-side port P1 may be sensed through a separate current sensing device (not shown).

In the second overcurrent detection step ( S480 ), the controller 110 may determine whether the current flowing through the first high-side port P1 is an overcurrent. The controller 110 may determine whether the current is overcurrent by considering whether the current flowing through the first high-side port P1 exceeds a preset reference current. The reference current may be set according to the user's needs.

In the third failure determination step S490 , the controller 110 may determine that the first high side port P1 has an SCG failure when an overcurrent occurs in the first high side port P1 .

In the second high-side control step (S500), the controller 110 turns the second high-side switching element SW2 of the high-side driver 120 when overcurrent does not occur in the first high-side port P1. you can control it. At this time, a current flowing through the second high-side port P2 may be sensed through a separate current sensing device (not shown). In addition, it is possible to detect whether the vehicle load 200 operates through a separate motion detection sensor (not shown).

In the third overcurrent detection step ( S510 ), the controller 110 may determine whether the current flowing through the second high-side port P2 is an overcurrent. The controller 110 may determine whether the current is overcurrent by considering whether the current flowing through the second high side port P2 exceeds a predetermined reference current.

In the fourth failure determination step S520, the controller 110 may determine that the second high side port P2 has an SCG failure when an overcurrent occurs in the second high side port P2.

In the operation determination step S530 , the control unit 110 may determine whether the vehicle load 200 operates when overcurrent does not occur in the second high side port P2 . When the vehicle load 200 is a push-pull solenoid, the controller 110 may determine whether the vehicle load 200 operates based on whether the plunger exceeds a reference position.

In the fifth failure determination step ( S540 ), when the operation of the vehicle load 200 is sensed, the control unit 110 may determine that the SCG failure of the low side port P3 occurs.

In the sixth failure determination step ( S550 ), the control unit 110 may determine an OL failure when the operation of the vehicle load 200 is not sensed.

The controller 110 may notify the outside of the location of the failure determined in the first failure determination step (S450) to the sixth failure determination step (S550) so that follow-up measures can be taken.

The above description is merely an example of the technical idea of the present invention, and those skilled in the art can make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings. .

Steps and/or actions in accordance with the present invention may occur concurrently in different embodiments, in different orders, or in parallel, or for different epochs, etc., as would be understood by one skilled in the art. can

In some embodiments, some or all of the steps and/or actions may include instructions, programs, interactive data structures, clients and/or servers stored on one or more non-transitory computer-readable media. At least some of them may be implemented or performed using one or more processors that do. The one or more non-transitory computer-readable media may illustratively be software, firmware, hardware, and/or any combination thereof. Additionally, the functions of a “module” discussed herein may be implemented in software, firmware, hardware, and/or any combination thereof.

100: solenoid fault diagnosis device
110: control unit
120: high side driver
130: low side driver
140: analog-to-digital converter unit
200: solenoid

Claims (13)

In the fault diagnosis method of a vehicle load driven by a high-side driver or a low-side driver,
a comparison step of comparing the output terminal voltage of the vehicle load with a failure diagnosis table prepared in advance, and determining a current state of the vehicle load according to a comparison result; and
a fault location determination step of controlling the high-side driver or the low-side driver for each current state and determining a fault location according to whether an overcurrent occurs or whether the vehicle load operates based on a control result;
A method for diagnosing a failure of a vehicle load comprising a. According to claim 1,
The vehicle load is
and a solenoid having a first output terminal and a second output terminal connected to the high-side driver and a third output terminal connected to the low-side driver. According to claim 2,
Prior to the comparing step, a voltage sensing step of sensing a voltage of the third output terminal of the vehicle load is further included,
Wherein the comparing step compares the voltage of the third output terminal with the failure diagnosis table. According to claim 2,
The failure diagnosis method of the vehicle load, characterized in that the failure diagnosis table includes SCB failure, normal, SCG failure, or OL failure. According to claim 4,
The fault location determination step,
a low side control step of turning on the low side driver when the current state is an SCB failure in the comparison step; and
a first overcurrent detection step of detecting whether an overcurrent occurs in a lowside port connected to the third output terminal when the lowside driver is turned on;
A method for diagnosing a failure of a vehicle load, comprising: According to claim 5,
The fault location determination step,
a first failure determination step of determining that an SCB failure of the low side port occurs when an overcurrent occurs in the low side port in the first overcurrent detection step; and
a second failure determination step of determining that an SCB failure of a high side port connected to the first output terminal or the second output terminal is caused when an overcurrent does not occur in the low side port in the first overcurrent detection step;
A method for diagnosing a failure of a vehicle load, further comprising: According to claim 4,
The fault location determination step,
a first high-side control step of turning on a first high-side switching element of the high-side driver connected to the first output terminal when the current state is an SCG failure or an OL failure in the comparing step; and
a second overcurrent detection step of detecting whether an overcurrent occurs in a first high-side port connected to the first output terminal when the first high-side switching element is turned on;
A method for diagnosing a failure of a vehicle load, comprising: According to claim 7,
The fault location determination step,
a third failure determination step of determining that an SCG failure of the first high-side port occurs when an overcurrent occurs in the first high-side port in the second overcurrent detection step;
A method for diagnosing a failure of a vehicle load, comprising: According to claim 8,
The fault location determination step,
A second high-side control step of turning on a second high-side switching element of the high-side driver connected to the second output terminal when no overcurrent occurs in the first high-side port in the second overcurrent detection step. ; and
a third overcurrent sensing step of detecting whether an overcurrent occurs in a second high side port connected to the second output terminal when the second high side switching element is turned on;
A method for diagnosing a failure of a vehicle load, further comprising: According to claim 9,
The fault location determination step,
a fourth failure determination step of determining that an SCG failure of the second high-side port occurs when an overcurrent occurs in the second high-side port in the third over-current detection step;
A method for diagnosing a failure of a vehicle load, further comprising: According to claim 10,
The fault location determination step,
an operation determination step of determining whether the vehicle load is operating when overcurrent does not occur in the second high-side port in the third overcurrent detection step;
A method for diagnosing a failure of a vehicle load, further comprising: According to claim 11,
The fault location determination step,
a fifth failure determination step of determining that the SCG failure of the low-side port is determined when the operation of the vehicle load is detected in the operation determination step; and
a sixth failure determination step of determining that an OL failure occurs when the operation of the vehicle load is not detected in the operation determination step;
A method for diagnosing a failure of a vehicle load, further comprising: According to claim 3,
The voltage sensing step,
The voltage of the diagnostic power supply passes through the first output terminal to which a first resistor for pulling up the voltage of the diagnostic power supply is connected, or the second output terminal to which a second resistor to pull up the voltage of the diagnostic power supply is connected, and the voltage of the diagnostic power supply is to the third output terminal. If approved,
The method for diagnosing a fault in a vehicle cupping, characterized in that sensing a voltage between a third resistor and a fourth resistor connected to the third output terminal and pulling down a voltage to ground.

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