KR20230099304A - Solenoid power supply monitoring control method and system - Google Patents

Abstract

A solenoid power supply monitoring method, of the present invention, may comprise the steps of: monitoring currents for power supply for a solenoid; initiating counting of a failure diagnosis time when overcurrent generated in supplying power to the solenoid exceeds a predetermined reference value; changing a device performing power supply control of the solenoid to a sub-control FET from a main power supply control FET; when the overcurrent exceeds the predetermined reference value until the failure diagnosis time is up, determining final failure and performing a failure measure; and when the overcurrent drops the predetermined reference value or less before the time is up to the failure diagnosis time, resetting the counted delay time. According to the present invention, the method can ensure an operation and safety of an operator through the solenoid power control when a solenoid power supply is failed.

Description

Solenoid power stage monitoring control method and system {SOLENOID POWER SUPPLY MONITORING CONTROL METHOD AND SYSTEM}

The present invention relates to a solenoid power stage monitoring and control method and system method for monitoring the occurrence of a solenoid power stage failure to prevent misdiagnosis by increasing the diagnosis time of over current through a cross-control diagnosis method of solenoid power. will be.

Short diagnosis time was applied for HW protection because there is a possibility of burnout of the power control stage when an overcurrent occurs in the process of supplying power to the solenoid (Solenoid Power Supply). Accordingly, even when an overcurrent occurs in the power supply to the solenoid for a short time that does not affect the driver, the solenoid power supply failure was diagnosed.

First, in the process of supplying power to the solenoid (Solenoid Power Supply), the overcurrent (Over Current) failure and diagnosis types will be looked at.

1 is a block diagram illustrating a concept of diagnosing a power supply failure for a solenoid according to the prior art.

As a method of diagnosing the power supply failure for the solenoid, a method of diagnosing by measuring the voltage of the power supply terminal (S1) and a method of diagnosing by checking the occurrence of over current in the solenoid power control FET (S2) are used. can

In the case of the illustrated power supply voltage measurement diagnosis (S1), diagnosis is made when the feedback voltage of the power supply terminal is out of a certain range due to disconnection and short circuit of the power supply terminal, and overcurrent detection (S2 ), if overcurrent occurs due to intermittent grounding with the ground level of the power supply stage, the composite power semiconductor recognizes it and diagnoses the failure.

Currently, in the case of diagnosing solenoid power supply over current, even if the above-described S1 method or S2 method is followed, when over current occurs for a predetermined time or longer, it is diagnosed as a failure. However, in order to prevent unnecessary failure diagnosis due to a short diagnosis time, when the diagnosis time is long in the case of a corresponding failure, there is a possibility of burnout of the power control FET. Therefore, it takes a short diagnosis time at the risk of unnecessary fault diagnosis.

If the diagnosis time is short, fault diagnosis is made even for intermittent short circuits that do not interfere with vehicle behavior, which can cause problems with driver's drivability and safety due to sudden shock.

In more detail, even if an overcurrent occurs in the solenoid power supply stage, the hydraulic pressure of the transmission is not immediately changed, so the transmission HW is not damaged and the drivability is not affected. However, the power control FET can be burnt out even with a short overcurrent, so the diagnosis time is shortened. This may substantially impair drivability and safety by performing unnecessary fault diagnosis.

Republic of Korea Registration No. 10-1509985

An object of the present invention is to provide a solenoid power stage monitoring and control method and system capable of ensuring driver's drivability and safety through solenoid power control when a solenoid power stage failure occurs.

A method for monitoring and controlling a solenoid power stage according to an aspect of the present invention includes monitoring a current for supplying power to a solenoid; Initiating counting of fault diagnosis time when the overcurrent generated in power supply to the solenoid exceeds a predetermined reference value; changing a device that controls power of the solenoid from a main power control FET to an auxiliary control FET; determining that the overcurrent exceeds a predetermined reference value until the failure diagnosis time is reached, determining that the overcurrent is a final failure, and taking a failure action; and resetting the counted delay time if the overcurrent falls below the predetermined reference value before reaching the fault diagnosis time.

Here, the determination of whether the overcurrent generated in the power supply terminal for the solenoid exceeds a predetermined reference value includes determining whether an overcurrent occurs in the main power control FET for the solenoid; and determining whether an overcurrent occurs in an auxiliary power control FET for the solenoid.

Here, the step of changing the element for controlling the power supply of the solenoid from the main power control FET to the auxiliary control FET includes controlling the main power control FET to be turned off; and controlling the auxiliary power control FET to be turned on.

Here, whether the fault diagnosis time has been reached can be confirmed using a continuous diagnosis counter counted as the number of overcurrent measurements that are repeatedly performed.

Here, whether or not the failure diagnosis time has been reached may include increasing the continuous diagnosis counter; checking whether the continuous diagnosis counter exceeds a predetermined set diagnosis time; starting a delay counter at 0 if the predetermined set diagnosis time is not exceeded; incrementing the delay counter; and if the delay counter is greater than the number of set delay times, measuring the overcurrent of the next solenoid power supply stage.

Here, in order to diagnose a noise signal generated during vehicle operation as an error, in the step of increasing the continuous diagnosis counter, a diagnosis number counter counting the number of overcurrent diagnoses during unit operation from starting the vehicle to driving and turning off is also included. and comparing the diagnosis number counter with a predetermined number of diagnosis times, and performing an error action if the diagnosis number counter is not greater than the predetermined number of diagnosis times.

Here, when the vehicle speed is greater than 0, a step of detecting the vehicle speed of the vehicle may be further included in order to proceed to the next overcurrent detection process without changing the main power control FET to ON control.

Here, immediately after the step of changing the main power supply control FET to the auxiliary control FET, a step of waiting for a predetermined maximum delay time following the current may be performed.

A solenoid power stage monitoring and control system according to another aspect of the present invention includes a main power control FET for supplying vehicle power to a solenoid as driving power; an auxiliary power control FET supplying vehicle power to the solenoid instead of the main power control FET; and a solenoid power control device for cross-controlling the auxiliary power control FET and the main power control FET during overcurrent occurrence diagnosis when an overcurrent occurrence of the solenoid power supply stage is measured to prevent overcurrent burnout of the main power control FET. there is.

Here, the solenoid power control device includes: monitoring a current for power supply to the solenoid; Initiating counting of fault diagnosis time when the overcurrent generated in power supply to the solenoid exceeds a predetermined reference value; changing a device that controls power of the solenoid from a main power control FET to an auxiliary control FET; determining that the overcurrent exceeds a predetermined reference value until the failure diagnosis time is reached, determining that the overcurrent is a final failure, and taking a failure action; and resetting the counted delay time if the overcurrent falls below the predetermined reference value before reaching the fault diagnosis time.

Here, the solenoid power control device may check whether the fault diagnosis time has been reached by using a continuous diagnosis counter counted as the number of overcurrent measurements that are repeatedly performed.

Here, the solenoid power control device may diagnose frequently generated noise signals by applying a diagnosis count counter counting the number of overcurrent diagnoses during unit operation from vehicle startup to engine off after driving.

Here, the solenoid power control device may perform the next overcurrent detection process without changing the main power control FET to ON control when the detected vehicle speed is greater than zero.

Here, the solenoid power control device may not perform overcurrent detection for a predetermined current follow-up maximum delay time after changing from the main power control FET to the auxiliary control FET.

When the method and/or system for controlling a solenoid power supply stage failure control according to the spirit of the present invention having the above configuration is implemented, there is an advantage in improving driver's drivability by preventing unnecessary failure diagnosis.

The method and/or system for controlling a failure of a solenoid power supply stage of the present invention has an advantage of improving safety of a driver through solenoid power control when a normal determination is made after a temporary failure diagnosis.

The solenoid power stage failure control method and/or system of the present invention has an advantage of preventing unnecessary loss of manpower and resources due to service sensors and quality response by increasing diagnostic consistency through cross-control of solenoid power.

1 is a block diagram illustrating a concept for diagnosing a power supply failure for a solenoid according to the prior art;
Figure 2 is a timing diagram showing a situation in which a problem occurs in the solenoid power stage monitoring and control system of Figure 1 according to the prior art.
Figure 3 is a block diagram showing the possibility of HW burnout due to overcurrent on the solenoid power stage monitoring and control system of Figure 1 in the situation of Figure 2;
4 is a timing diagram illustrating a method of performing crossover control for a power control FET (Solenoid Power HW) according to the spirit of the present invention.
5 is a flowchart illustrating an embodiment of a method for monitoring and controlling a solenoid power stage according to the spirit of the present invention described above.
6 is a timing diagram illustrating a maximum delay time for current tracking occurring when a solenoid Off/On control is changed.
7A and 7B are timing diagrams illustrating a counting process of a continuous diagnostic counter counting an overcurrent fault diagnosis.
8 is a flowchart illustrating a method for monitoring and controlling a solenoid power stage according to an embodiment in which solutions to problems in application to a vehicle described above with respect to the method for monitoring and controlling a solenoid power stage of FIG. 5 are reflected;
9 is a block diagram showing an embodiment of a solenoid power stage monitoring and control system according to the spirit of the present invention described above.

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. Terms are only for the purpose of distinguishing one element from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

When a component is referred to as being connected or connected to another component, it may be directly connected or connected to the other component, but it may be understood that another component may exist in the middle. .

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions may include plural expressions unless the context clearly dictates otherwise.

In this specification, the terms include or include are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features or numbers, It can be understood that the presence or addition of steps, operations, components, parts, or combinations thereof is not precluded.

In addition, shapes and sizes of elements in the drawings may be exaggerated for clearer description.

2 is a timing diagram illustrating a situation in which a problem occurs in the solenoid power stage monitoring and control system of FIG. 1 according to the prior art.

Figure 3 shows the possibility of HW burnout due to overcurrent on the solenoid power stage monitoring and control system of Figure 1 in the situation of Figure 2.

As shown, if the current measurement value according to the S2 method exceeds a predetermined overcurrent detection threshold, measures to prevent failure should be taken, but the current measurement value may increase instantaneously due to external noise generated during vehicle operation. Bar, as shown in FIG. 2, it is preferable to wait and check whether the overcurrent state is maintained for a predetermined fault diagnosis time. However, overcurrent continues to flow into the FET during the waiting time, and may cause damage to the FET as shown in FIG. 3 .

4 is a timing diagram illustrating a method of performing crossover control for a power control FET (Solenoid Power HW) according to the spirit of the present invention.

In the present invention, when a solenoid power supply stage overcurrent (Solenoid Power Over Current) is measured, a diagnosis method (i.e., monitoring and control method) of performing cross-control for the power control FET (Solenoid Power HW) in which overcurrent burnout occurs in a relatively short time , and through this, it is possible to substantially increase the fault diagnosis time to prevent intermittent diagnosis of overcurrent.

5 is a flowchart illustrating an embodiment of a method for monitoring and controlling a solenoid power stage according to the spirit of the present invention described above.

The illustrated solenoid power stage monitoring and control method includes monitoring a current for power supply to the solenoid (S100); If the overcurrent generated in the power supply to the solenoid exceeds a predetermined reference value (S200), starting counting the fault diagnosis time (S300); Changing the element for controlling the power supply of the solenoid from the solenoid main power supply control FET to an auxiliary control FET (S400); If the overcurrent maintains a state exceeding a predetermined reference value until the failure diagnosis time is reached (S500), determining that the failure is final and performing a failure action (S900); and resetting the counted delay time if the overcurrent falls below the predetermined reference value before reaching the fault diagnosis time (S800).

The method for monitoring and controlling the solenoid power stage according to the spirit of the present invention shown in the drawings can prevent misdiagnosis by increasing diagnosis accuracy while preventing burnout of the power control FET.

Specifically, applying the control method in case of a failure of the power supply to the solenoid prevents unnecessary overcurrent diagnosis that does not affect the driver, and also, a control method of solenoid power at the time of normal determination after a temporary failure occurs It can improve the driver's safety and drivability.

However, when the solenoid power stage monitoring and control method according to the flowchart of FIG. 4 is actually applied to a complex power semiconductor for power control of electrical equipment of a vehicle, failures may partially occur.

Hereinafter, problems and specific solutions to the problems will be described as specific examples that can be caused by excessive or too relaxed overcurrent determination.

In the case of applying the leisurely overcurrent judgment, when the overcurrent of the solenoid power occurs for a long time, the power control FET burns out.

In this regard, as a method proposed by the present invention, when overcurrent is detected, the control of the existing power control FET is turned off to prevent burnout of the existing power control FET, and a separate auxiliary power control FET for solenoid power control is turned on Through crossover control to control, burnout of the power control FET generated by overcurrent maintained for a long time is prevented. This is the main idea of the present invention mentioned above, but it is summarized once again according to the frame of the problem-solving method.

6 is a timing diagram illustrating a maximum delay time for current tracking occurring when a solenoid Off/On control is changed.

On the other hand, when controlling from the solenoid off state to the on state, as shown in FIG. 5, a delay occurs in the case of current, so it may be inappropriate to detect the occurrence of over current at the beginning of off-on control. .

In this regard, as a method proposed by the present invention, an overcurrent sensing operation can be excluded during the current tracking maximum delay time that occurs when the control is changed from the solenoid off state to the on state.

7A and 7B are timing diagrams illustrating a counting process of a continuous diagnosis counter that counts an overcurrent error diagnosis.

In addition, when the power control FET is turned off according to the spirit of the present invention described above, since overcurrent does not occur for the corresponding FET, it is impossible to diagnose the overcurrent that is continuously maintained, which is referred to as overcurrent. It is costly to provide a separate time measurement method for measuring the time that is maintained continuously.

In contrast, as a method proposed by the present invention, a continuous diagnosis counter (eg: 3 consecutive times) counted as the number of overcurrent measurements repeatedly performed is used to maintain fault diagnosis during crossover control of the main solenoid FET and the auxiliary solenoid FET. make it possible

It is common for overcurrent diagnosis to appear in alternating form as shown in FIG. 6A according to FET crossover control, but when overcurrent diagnosis continues as shown in FIG. Faster action may follow.

In addition, a frequently occurring noise signal can be diagnosed by applying a diagnosis count counter (eg, accumulated 7 times) counting the number of overcurrent diagnoses during unit operation from vehicle start-up to start-off.

In addition, when the vehicle's solenoid power stage is changed (main power control FET ⇔ auxiliary power control FET), a delay in oil pressure change may occur, although for a short time, which may cause danger to the vehicle in motion.

In this regard, as a method proposed by the present invention, when a temporary failure is determined and then controlled by the auxiliary FET (power stage) and then normal judged, when changing back to the main FET (power stage), the vehicle speed condition is checked and only when the vehicle is stopped Change the solenoid power supply so that it does not affect the oil pressure change. Theoretically, the vehicle speed condition should be checked in the same way when changing from the main FET (power stage) to the main FET (power stage).

FIG. 8 is a flowchart illustrating a method for monitoring and controlling a solenoid power stage according to an embodiment in which solutions to problems in application to a vehicle described above with respect to the method for monitoring and controlling a solenoid power stage of FIG. 5 are reflected.

The step of monitoring the current for supplying power to the solenoid of FIG. 5 (S100) is not shown in FIG. 8, but can of course be performed in the embodiment of FIG. 8 as well.

The flowchart of FIG. 8 does not represent the starting state, but represents the iterative cycle process. When the starting conditions are described, the continuous diagnosis counter is 0, the main solenoid FET is in the power-on state, and the auxiliary solenoid FET is in the power-off state. It is a state.

The step of determining whether the overcurrent generated in the power supply stage for the solenoid in FIG. 5 exceeds a predetermined reference value (S200) is the step of determining the occurrence of overcurrent in the main power control FET for the solenoid in FIG. 8 (S201) and the solenoid It is divided into a step (S202) of determining the occurrence of an overcurrent of the auxiliary power control FET for the.

Step S400 of FIG. 5 includes controlling the main power control FET to turn off as shown in FIG. 8 when an overcurrent in the main power control FET occurs in a state in which the main power control FET is activated (S421); and controlling the auxiliary power control FET to be turned on (S441). Similarly, when an overcurrent occurs in the main power control FET while the auxiliary power control FET is activated, controlling the auxiliary power control FET off (S422); and turning on the main power control FET (S442).

In FIG. 8 , the overcurrent determination steps (S201 and S202) performed before counting of the fault diagnosis time and the overcurrent determination steps (S501 and S502) performed after counting start are combined and expressed. Determination of the overcurrent measured during the fault diagnosis time in step S500 of FIG. 5 is performed by steps S501 and S502 of FIG. S510); and checking whether the continuous diagnosis counter exceeds a predetermined set diagnosis time (S520). Steps S510 and S520 are repeatedly performed during the fault diagnosis time. In order to accurately match the time elapsed by the number of times, starting a delay counter at 0 at each repetition (S560); increasing the delay counter (S570); And if the delay counter is greater than the number of set delay times (S580), a step of measuring the overcurrent of the solenoid power supply terminal may be performed.

In summary, the fault diagnosis time counting in FIG. 8 is performed depending on whether the continuous diagnosis counter exceeds a predetermined set diagnosis time (the count is more accurate, but expressed as time to emphasize that the waiting time has elapsed) . This is a method with excellent economic efficiency because it does not require a separate time counter and can determine the time elapsed by the number of executions of each overcurrent determination step (S201, S202, S501, S502).

After the steps of determining the occurrence of overcurrent in the auxiliary power control FET shown (S202, S502), it is checked again whether the main power control FET is turned OFF (S620), which is an exceptional situation in which a setting state error occurs in the repeated overcurrent detection process This is for understanding, and may be omitted depending on the implementation.

If the overcurrent occurrence of the auxiliary power control FET is not measured in the OFF control situation of the main power control FET, the main power control FET is changed to ON control. inspection; and/or a vehicle speed check.

In the inspection of the accumulated number of occurrences of overcurrent, a diagnosis count counter counting the number of overcurrent diagnoses during unit operation from vehicle start-up to start-off after driving is applied to diagnose frequently occurring noise signals as errors. .

To this end, in the step of increasing the continuous diagnosis counter (S510), the diagnosis number counter is also increased, and the diagnosis number counter is compared with a predetermined number of diagnosis numbers (S700). If the diagnosis number counter is greater than the predetermined set number of diagnosis times, the main power control FET is changed to ON control, otherwise an alarm/action is performed as an error.

In FIG. 8, if the number of times of diagnosis counter is greater than the predetermined number of times of diagnosis, a step of checking the vehicle speed (S820) is performed, and if the vehicle speed is greater than 0, the next overcurrent without changing the main power control FET to ON control. Proceeding to the detection process, when the vehicle speed is 0, controlling the auxiliary power control FET to be OFF (S840); and controlling ON of the main power control FET (S850).

Depending on the implementation, a step of waiting for a predetermined maximum delay time for current tracking may be performed after the step S850 in consideration of the current delay of the FET (Current Delay in Off→On control). The step of waiting for the current tracking maximum delay time may be performed in a manner similar to steps S560, S570, and S580 of FIG. 8 .

Steps S820, S840, S850, and S880 of FIG. 8 can be regarded as subdivided steps S800 of FIG. 5, and the continuous diagnosis counter can be reset in step S880.

The step of starting counting the fault diagnosis time (S300) of FIG. 8 was not explicitly implemented in FIG. 7, but it can be seen that it was substantially replaced and implemented by step S201 performed after step S640 was performed. there is.

9 is a block diagram showing an embodiment of a solenoid power stage monitoring and control system according to the spirit of the present invention described above.

The illustrated solenoid power stage monitoring and control system 100 includes a main power control FET 110 supplying vehicle power 40 to the solenoid 20 as driving power; an auxiliary power control FET 120 supplying vehicle power 40 to the solenoid 20 instead of the main power control FET 110; and cross-controlling the auxiliary power control FET 120 and the main power control FET 110 during overcurrent diagnosis when an overcurrent occurrence of the solenoid power supply stage is measured to prevent overcurrent burnout of the main power control FET 110. It includes a solenoid power control device 140 that does.

When applied to a general vehicle, it is advantageous in terms of economy that the solenoid power control device 140 is implemented in the form of an internal SW module of a composite power semiconductor that controls power supply to electric devices installed in the vehicle.

The vehicle includes a control unit 10 for the entire vehicle; And the solenoid driving IC 30 for instructing the opening and closing operation of the solenoid 20 is further included, and the solenoid power stage monitoring and control method according to the spirit of the present invention is performed.

However, the solenoid power stage monitoring and control method according to the spirit of the present invention as shown in FIG. 5 and / or 8 is performed by the solenoid power supply control device 140, and the solenoid power stage monitoring and control method In HW, a cross connection structure between the main power control FET 110 and the auxiliary power control FET 120 is required.

In performing the solenoid power stage monitoring and control method, the solenoid power supply control device 140 may check whether the fault diagnosis time has been reached by using a continuous diagnosis counter counted as the number of overcurrent measurements that are repeatedly performed.

In addition, the solenoid power control device 140 applies a diagnosis count counter that counts the number of overcurrent diagnoses during unit operation from vehicle start-up to start-off after driving to diagnose frequently occurring noise signals. there is.

In addition, when the detected vehicle speed is greater than zero, the solenoid power control device 140 may perform the next overcurrent detection process without changing the main power control FET to ON control.

In addition, the solenoid power supply control device 140 performs the solenoid power stage monitoring and control method in such a way that overcurrent detection is not performed for a predetermined current following maximum delay time after changing from the main power supply control FET to the auxiliary control FET can do.

Those skilled in the art to which the present invention pertains should understand that the embodiments described above are illustrative in all respects and not limiting, since the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. only do The scope of the present invention is indicated by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

20: solenoid
40: vehicle power
100: solenoid power stage monitoring control system
110: main power control FET
120: auxiliary power control FET
140: solenoid power control device

Claims (14)

monitoring the current for power supply to the solenoid;
Initiating counting of fault diagnosis time when the overcurrent generated in power supply to the solenoid exceeds a predetermined reference value;
changing a device that controls power of the solenoid from a main power control FET to an auxiliary control FET;
determining that the overcurrent exceeds a predetermined reference value until the failure diagnosis time is reached, determining that the overcurrent is a final failure, and taking a failure action; and
resetting the counted delay time if the overcurrent falls below the predetermined reference value before reaching the fault diagnosis time;
Solenoid power stage monitoring control method comprising a.
According to claim 1,
Determination of whether the overcurrent generated at the power supply stage for the solenoid exceeds a predetermined reference value,
Determining whether overcurrent occurs in the main power control FET for the solenoid; and
Determining overcurrent occurrence of auxiliary power control FET for solenoid
Solenoid power stage monitoring and control method performed by
According to claim 1,
The step of changing the element that controls the power supply of the solenoid from the main power control FET to the auxiliary control FET,
controlling the main power control FET to turn off; and
Controlling the auxiliary power control FET on
Solenoid power stage monitoring control method comprising a.
According to claim 1,
Whether or not the fault diagnosis time is reached,
A method for monitoring and controlling a solenoid power stage that is checked using a continuous diagnosis counter counted as the number of overcurrent measurements performed repeatedly.
According to claim 4,
Whether or not the fault diagnosis time is reached,
incrementing the continuous diagnostic counter;
checking whether the continuous diagnosis counter exceeds a predetermined set diagnosis time;
starting a delay counter at 0 if the predetermined set diagnosis time is not exceeded;
incrementing the delay counter; and
If the delay counter is greater than the number of set delay times, proceeding with the next solenoid power stage overcurrent measurement
Solenoid power stage monitoring and control method performed by
According to claim 5,
In order to diagnose noise signals generated during vehicle operation as errors,
In the step of increasing the continuous diagnosis counter, a diagnosis number counter counting the number of times of overcurrent diagnosis during unit operation from vehicle start-up to start-off after driving is also increased,
Comparing the diagnosis number counter with a predetermined set diagnosis number, and performing an error action if the diagnosis number counter is not greater than a predetermined set diagnosis number
Solenoid power stage monitoring control method further comprising a.
According to claim 1,
If the vehicle speed is greater than 0, detecting the vehicle speed of the vehicle to proceed to the next overcurrent detection process without changing the main power control FET to ON control
Solenoid power stage monitoring control method further comprising a.
According to claim 1,
Immediately after the step of changing from the main power control FET to the auxiliary control FET,
Waiting for a predetermined current follow-up maximum delay time
Solenoid power stage monitoring control method that performs.
a main power control FET supplying vehicle power to the solenoid as driving power;
an auxiliary power control FET supplying vehicle power to the solenoid instead of the main power control FET; and
Solenoid power control device for cross-controlling the auxiliary power control FET and the main power control FET during diagnosis of overcurrent occurrence when overcurrent occurrence of the solenoid power stage is measured to prevent overcurrent burnout of the main power control FET
A solenoid power stage monitoring control system comprising a.
According to claim 9,
The solenoid power control device,
monitoring the current for power supply to the solenoid;
Initiating counting of fault diagnosis time when the overcurrent generated in power supply to the solenoid exceeds a predetermined reference value;
changing a device that controls power of the solenoid from a main power control FET to an auxiliary control FET;
determining that the overcurrent exceeds a predetermined reference value until the failure diagnosis time is reached, determining that the overcurrent is a final failure, and taking a failure action; and
resetting the counted delay time if the overcurrent falls below the predetermined reference value before reaching the fault diagnosis time;
A solenoid power stage monitoring control system that performs a solenoid power stage monitoring control method comprising a.
According to claim 10,
The solenoid power control device,
A solenoid power stage monitoring and control system that checks whether the fault diagnosis time has been reached by using a continuous diagnosis counter counted as the number of overcurrent measurements that are repeatedly performed.
According to claim 10,
The solenoid power control device,
A solenoid power stage monitoring and control system that diagnoses frequently occurring noise signals by applying a diagnosis count counter that counts the number of overcurrent diagnoses during unit operation from vehicle start-up to engine-off.
According to claim 10,
The solenoid power control device,
A solenoid power stage monitoring and control system that performs the next overcurrent detection process without changing the main power control FET to ON control when the detected vehicle speed is greater than 0.
According to claim 10,
The solenoid power control device,
The solenoid power stage monitoring and control system does not perform overcurrent detection for a predetermined current tracking maximum delay time after changing from the main power control FET to the auxiliary control FET.

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