KR102623868B1 - Solenoid power supply monitoring control method and system - Google Patents

Abstract

The solenoid power terminal monitoring and control method of the present invention includes the steps of monitoring a current for supplying power to a solenoid; If the overcurrent generated in supplying power to the solenoid exceeds a predetermined reference value, starting to count the failure diagnosis time; Changing the element that performs power control of the solenoid from the main power control FET to the auxiliary control FET; If the overcurrent remains in a state exceeding a predetermined reference value until the failure diagnosis time is reached, determining a final failure and performing failure measures; and resetting the counted delay time if the overcurrent falls below the predetermined reference value before reaching the failure diagnosis time.

Description

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

The present invention relates to a solenoid power terminal monitoring control method and system method for monitoring the occurrence of solenoid power terminal failure by increasing the diagnosis time of over current (Over Current) and preventing misdiagnosis through a cross-control diagnostic method of solenoid power (Power). will be.

When overcurrent occurs during the solenoid power supply process, there is a possibility of burnout of the power control stage, so a short diagnosis time was applied to protect HW. Accordingly, a solenoid power supply failure was diagnosed even when overcurrent occurred in the power supply to the solenoid for a short period of time without affecting the driver.

First, we will look at overcurrent failures and diagnosis types during the solenoid power supply process.

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

Methods for diagnosing a power supply failure to a solenoid include a method of diagnosing by measuring the voltage at the power supply terminal (S1), and a method of diagnosing by checking the occurrence of overcurrent in the solenoid power control FET (S2). You can.

In the case of the power supply voltage measurement diagnosis (S1) shown, it is diagnosed when the feedback voltage of the power supply terminal is outside a certain range due to disconnection or short circuit of the power supply terminal, and over current detection (S2) ), if overcurrent occurs due to intermittent grounding with the ground level of the power supply terminal, the composite power semiconductor recognizes this and diagnoses the fault.

Currently, in the case of diagnosing a solenoid power supply over current, even if the above-mentioned S1 or S2 method is followed, if the overcurrent occurs for more than a certain period of time, it is diagnosed as a failure. However, in order to prevent unnecessary failure diagnosis due to a short diagnosis time, if the diagnosis time is extended for the corresponding failure, there is a possibility of the power control FET being burned out. Therefore, unnecessary fault diagnosis occurs and short diagnosis time is achieved.

If the diagnosis time is shortened, the fault will be diagnosed even if there is an intermittent short circuit that does not affect the vehicle's operation, which may impair the driver's drivability and cause safety problems due to sudden shocks.

To explain a more detailed example, even if an overcurrent occurs in the solenoid power supply stage, the hydraulic pressure of the transmission is not immediately changed, so there is no effect on transmission HW burnout or drivability. However, the power control FET can be damaged even by a short period of overcurrent, which shortens the diagnosis time. This can lead to unnecessary fault diagnosis, which can actually impede drivability and safety.

Republic of Korea Registered Publication No. 10-1509985

The present invention seeks to provide a solenoid power terminal monitoring and control method and system that can ensure driver drivability and safety through solenoid power control when a solenoid power terminal failure occurs.

A solenoid power terminal monitoring and control method according to an aspect of the present invention includes monitoring a current for supplying power to a solenoid; If the overcurrent generated in supplying power to the solenoid exceeds a predetermined reference value, starting to count the failure diagnosis time; Changing the element that performs power control of the solenoid from the main power control FET to the auxiliary control FET; If the overcurrent remains in a state exceeding a predetermined reference value until the failure diagnosis time is reached, determining a final failure and performing failure measures; and resetting the counted delay time if the overcurrent falls below the predetermined reference value before reaching the failure diagnosis time.

Here, determining whether the overcurrent generated at the power supply end 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 the occurrence of overcurrent in the auxiliary power control FET for the solenoid.

Here, the step of changing the element that performs power control of the solenoid from the main power control FET to the auxiliary control FET includes the steps of turning off the main power control FET; And it may include the step of controlling the auxiliary power control FET to be turned on.

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

Here, whether the failure diagnosis time has been reached can be determined by: increasing the continuous diagnosis counter; checking whether the continuous diagnosis counter exceeds a predetermined set diagnosis time; If a predetermined set diagnosis time is not exceeded, starting the delay counter at 0; increasing the delay counter; And if the delay counter is greater than the number of set delay times, the next solenoid power stage overcurrent measurement can be performed.

Here, in order to diagnose noise signals generated during vehicle operation as errors, in the step of increasing the continuous diagnosis counter, there is also a diagnosis counter that counts the number of overcurrent diagnoses during unit operation from vehicle start to driving and ignition off. The method may further include increasing the diagnosis count and comparing the diagnosis count with a predetermined set diagnosis count, and performing an error action if the diagnosis count counter is not greater than the preset set diagnosis count.

Here, when the vehicle speed is greater than 0, a step of detecting the vehicle speed 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 from the main power control FET to the auxiliary control FET, a step of waiting for a predetermined maximum current tracking delay time 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 that supplies vehicle power to the solenoid as driving power; An auxiliary power control FET that supplies vehicle power to the solenoid instead of the main power control FET; And in order to prevent overcurrent burnout of the main power control FET, a solenoid power control device that cross-controls the auxiliary power control FET and the main power control FET during overcurrent occurrence diagnosis when the solenoid power terminal overcurrent is measured. there is.

Here, the solenoid power control device includes: monitoring current for supplying power to the solenoid; If the overcurrent generated in supplying power to the solenoid exceeds a predetermined reference value, starting to count the failure diagnosis time; Changing the element that performs power control of the solenoid from the main power control FET to the auxiliary control FET; If the overcurrent remains in a state exceeding a predetermined reference value until the failure diagnosis time is reached, determining a final failure and performing failure measures; And if the overcurrent falls below the predetermined reference value before reaching the failure diagnosis time, resetting the counted delay time can be performed.

Here, the solenoid power control device can check whether the failure diagnosis time has been reached using a continuous diagnosis counter that counts as the number of overcurrent measurements performed repeatedly.

Here, the solenoid power control device can perform diagnosis on frequently occurring noise signals by applying a diagnosis count counter that counts the number of overcurrent diagnoses during unit operation from vehicle start to driving and ignition-off.

Here, when the detected vehicle speed of the vehicle is greater than 0, the solenoid power control device may perform the next overcurrent detection process without changing the main power control FET to ON control.

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

Implementing the solenoid power terminal failure control method and/or system according to the spirit of the present invention with the above-described configuration has the advantage of improving the driver's drivability by preventing unnecessary failure diagnosis.

The solenoid power terminal failure control method and/or system of the present invention has the advantage of improving driver safety through solenoid power control when normal judgment is made after temporary failure diagnosis.

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

1 is a block diagram showing 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 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 in the solenoid power stage monitoring and control system of Figure 1 in the situation of Figure 2.
Figure 4 is a timing diagram showing a method of performing crossover control for a power control FET (Solenoid Power HW) according to the spirit of the present invention.
Figure 5 is a flowchart showing an embodiment of a solenoid power stage monitoring and control method according to the spirit of the present invention described above.
Figure 6 is a timing diagram showing the maximum current tracking delay time that occurs when changing solenoid Off/On control.
7A and 7B are timing diagrams illustrating the counting process of a continuous diagnostic counter that counts overcurrent fault diagnostics.
FIG. 8 is a flowchart showing a solenoid power end monitoring and control method according to an embodiment that reflects solutions to problems in vehicle application described above with respect to the solenoid power end monitoring and control method of FIG. 5. FIG.
Figure 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 intended only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may be referred to as a first component without departing from the scope of the present invention.

When a component is mentioned as being connected or connected to another component, it can be understood that it may be directly connected to or connected to the other component, but other components may exist in between. .

The terms used herein are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly indicates otherwise.

In this specification, terms such as include or have are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, including one or more other features or numbers, It can be understood that the existence or addition possibility of steps, operations, components, parts, or combinations thereof is not excluded in advance.

Additionally, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

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

Figure 3 shows the possibility of HW burnout due to overcurrent in 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 must be taken to prevent failure, but the current measurement value may momentarily increase due to external noise generated during vehicle operation. As shown in FIG. 2, it is desirable to wait and check whether the overcurrent state is maintained for a predetermined fault diagnosis time. However, during the waiting time, overcurrent continues to flow into the FET, etc., which may cause damage to the FET as shown in FIG. 3.

Figure 4 is a timing diagram showing 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 the occurrence of solenoid power over current (Solenoid Power Over Current) is measured, a diagnostic method (i.e., monitoring control method) that performs cross-control on the power control FET (Solenoid Power HW), which causes overcurrent burnout in a relatively short period of time. is presented, and through this, the fault diagnosis time can be substantially increased to prevent intermittent diagnosis of overcurrent.

Figure 5 is a flowchart showing an embodiment of a solenoid power stage monitoring and control method according to the spirit of the present invention described above.

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

The solenoid power stage monitoring and control method according to the spirit of the present invention shown can prevent misdiagnosis by increasing diagnostic accuracy while preventing damage to the power control FET.

Specifically, applying a control method when a power supply failure to the solenoid occurs prevents unnecessary overcurrent diagnosis that does not affect the driver, and also provides a control method for solenoid power when normal is determined after a temporary failure. It can improve driver safety and drivability.

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

Below, we will look at the problems and specific solutions for them as specific examples that can result from excessive or too relaxed overcurrent determination.

When a relaxed overcurrent determination is applied, if the overcurrent of the solenoid power occurs for a long period of time, the power control FET is burned out.

In response to this, the present invention proposes a solution that turns off the control of the existing power control FET when overcurrent is detected, prevents damage to the existing power control FET, and turns on a separate auxiliary power control FET for solenoid power control. Through crossover control, burnout of the power control FET that generates overcurrent that is maintained for a long time is prevented. This is the main idea of the invention mentioned above, but it has been organized once again according to the frame of the problem-solution method.

Figure 6 is a timing diagram showing the maximum current tracking delay time that occurs when changing solenoid Off/On control.

On the other hand, when controlling the solenoid from the Off state to the On state, a delay occurs in the current as shown in FIG. 5, which may make it inappropriate to detect the occurrence of overcurrent in the early stages of Off-On control. .

Regarding this, as a solution proposed by the present invention, the overcurrent detection operation can be excluded during the maximum current tracking delay time that occurs when the control of the solenoid is changed from the Off state to the On state.

7A and 7B are timing diagrams illustrating the counting process of a continuous diagnostic counter that counts overcurrent fault diagnosis.

In addition, when the power control FET is turned off according to the spirit of the present invention described above, no overcurrent is generated for the relevant FET, so it is not possible to diagnose the continuously maintained overcurrent, which is called overcurrent. It is expensive to provide a separate means of measuring time to measure the time that is continuously maintained.

Regarding this, as a solution proposed by the present invention, the fault diagnosis is maintained when cross-controlling the main solenoid FET and the auxiliary solenoid FET by applying a continuous diagnosis counter that counts as the number of overcurrent measurements performed repeatedly (e.g., 3 times in a row). make it possible

It is common for overcurrent diagnosis to alternate as shown in FIG. 6A according to FET crossover control. However, if overcurrent diagnosis continues as shown in FIG. 6B due to failure of one FET, etc., the continuous diagnosis counter saturates more quickly, More rapid action may follow.

Additionally, noise signals that occur frequently can be diagnosed by applying a diagnosis count counter (e.g., 7 times accumulated) that counts the number of overcurrent diagnoses during unit operation from the vehicle's start to driving and ignition-off.

In addition, when the solenoid power stage of the vehicle is changed (main power control FET ⇔ auxiliary power control FET), there may be a delay in hydraulic pressure change, albeit for a short period of time, which may cause danger to the vehicle in operation.

Regarding this, as a solution proposed by the present invention, after a temporary failure is determined and controlled by the auxiliary FET (power stage), when normal is determined and changed back to the main FET (power stage), the vehicle speed condition is checked and only when the vehicle is stopped. Change the solenoid power stage so that it does not affect the hydraulic pressure change. In theory, 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), but in practice, in this case, the effect of the hydraulic pressure change is not significant, so the vehicle speed condition may not be applied.

FIG. 8 is a flowchart showing a solenoid power end monitoring and control method according to an embodiment that reflects solutions to the problems in vehicle application described above with respect to the solenoid power end monitoring and control method of FIG. 5.

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

The flowchart in FIG. 8 does not express the start state, but rather expresses the repetitive cycle process. When the start 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 terminal for the solenoid in FIG. 5 (S200) exceeds a predetermined reference value, and in FIG. 8, the step of determining whether the overcurrent occurs in the main power control FET for the solenoid (S201) and the solenoid It was divided into a step (S202) to determine the occurrence of overcurrent in the auxiliary power control FET.

In step S400 of FIG. 5, when overcurrent of the main power control FET occurs while the main power control FET is activated, as shown in FIG. 8, a step of controlling the main power control FET to turn off (S421); and controlling the auxiliary power control FET to turn on (S441). Similarly, when overcurrent occurs in the main power control FET while the auxiliary power control FET is activated, controlling the auxiliary power control FET to turn off (S422); and controlling the main power control FET to turn on (S442).

In FIG. 8, the overcurrent determination steps (S201, S202) performed before the failure diagnosis time counting starts and the overcurrent judgment steps (S501, S502) performed after the counting starts are integrated and expressed. The overcurrent determination measured during the fault diagnosis time in step S500 of FIG. 5 is performed by steps S501 and S502 of FIG. 8, and the determination of whether the fault diagnosis time has elapsed is the step of increasing the continuous diagnosis counter in FIG. 8 ( S510); and checking whether the continuous diagnosis counter exceeds a predetermined set diagnosis time (S520). The 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, a step of starting the 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), the step of measuring the solenoid power terminal overcurrent can be proceeded.

In summary, in FIG. 8, failure diagnosis time counting is performed based on whether the continuous diagnosis counter exceeds a predetermined set diagnosis time (the number of times is more accurate, but is expressed in hours to emphasize that it is for determining whether the waiting time has elapsed). . This method is highly economical because it does not require a separate time counter and can determine the elapse of time based on the number of times each overcurrent determination step (S201, S202, S501, S502) is performed.

After 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 OFF (S620), which is an unusual situation in which a setting state error occurs during the repetitive overcurrent detection process. This is to understand 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. Depending on the implementation, the cumulative number of overcurrent occurrences during unit driving of the vehicle is determined beforehand. inspection; and/or a vehicle speed check may be performed.

In checking the cumulative number of overcurrent occurrences, frequently occurring noise signals can be diagnosed as errors by applying a diagnostic counter that counts the number of overcurrent diagnostics during unit operation from vehicle start to driving to ignition off. .

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 set diagnosis number (S700). If the diagnosis count counter is greater than the predetermined set diagnosis count, change the main power control FET to ON control, otherwise, perform an alarm/action as an error.

In FIG. 8, if the diagnosis count counter is additionally greater than the predetermined set diagnosis count, a step (S820) of checking the vehicle speed is performed. If the vehicle speed is greater than 0, the main power control FET is not changed to ON control and the next overcurrent is continued. Proceeding to the detection process, when the vehicle speed is 0, controlling the auxiliary power control FET to be OFF (S840); and a step of controlling the ON of the main power control FET (S850).

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

Steps S820, S840, S850, and S880 of FIG. 8 can be viewed as a subdivision of step S800 of FIG. 5, and in step S880, the continuous diagnosis counter can be reset.

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

Figure 9 is a block diagram showing an embodiment of a solenoid power stage monitoring 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 that supplies vehicle power 40 as driving power to the solenoid 20; An auxiliary power control FET (120) that supplies vehicle power (40) to the solenoid (20) instead of the main power control FET (110); And in order to prevent overcurrent burnout of the main power control FET (110), when overcurrent at the solenoid power terminal is measured, the auxiliary power control FET (120) and the main power control FET (110) are cross-controlled during overcurrent occurrence diagnosis. It includes a solenoid power control device 140 that does.

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

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

However, under the leadership of the solenoid power control device 140, the solenoid power end monitoring control method according to the spirit of the present invention as shown in Figures 5 and/or 8 is performed, and the solenoid power end monitoring control method includes In terms of HW, a cross-capable connection structure of the main power control FET 110 and the auxiliary power control FET 120 is required.

When performing the solenoid power terminal monitoring control method, the solenoid power control device 140 can check whether the failure diagnosis time has been reached using a continuous diagnosis counter that counts as the number of overcurrent measurements performed repeatedly.

In addition, the solenoid power control device 140 can perform diagnosis on frequently occurring noise signals by applying a diagnosis count counter that counts the number of overcurrent diagnoses during unit operation from vehicle start to driving and ignition off. there is.

Additionally, when the detected vehicle speed of the vehicle is greater than 0, 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 control device 140 performs the solenoid power terminal monitoring control method by not performing overcurrent detection for a predetermined maximum current tracking delay time after changing from the main power control FET to the auxiliary control FET. can do.

Those skilled in the art to which the present invention pertains should understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features, and that the embodiments described above are illustrative in all respects and not restrictive. Just do it. The scope of the present invention is indicated by the claims described later rather than the detailed description, and all changes or modified forms 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 to power the solenoid;
If the overcurrent generated in supplying power to the solenoid exceeds a predetermined reference value, starting to count the failure diagnosis time;
Changing the element that performs power control of the solenoid from the main power control FET to the auxiliary power control FET;
If the overcurrent remains in a state exceeding a predetermined reference value until the failure diagnosis time is reached, determining a final failure and performing failure measures; and
If the overcurrent falls below the predetermined reference value before reaching the failure diagnosis time, resetting the counted delay time.
Including,
Whether or not the above fault diagnosis time is reached is,
incrementing a continuous diagnostic counter (counted as the number of overcurrent measurements performed repeatedly);
checking whether the continuous diagnosis counter exceeds a predetermined set diagnosis time;
If a predetermined set diagnosis time is not exceeded, starting the delay counter at 0;
increasing the delay counter; and
If the delay counter is greater than the number of set delay times, proceed to the next solenoid power stage overcurrent measurement.
Solenoid power stage monitoring control method performed by .
According to paragraph 1,
To determine whether the overcurrent generated in the power supply terminal to the solenoid exceeds a predetermined standard value,
Determining whether an overcurrent occurs in the main power control FET for the solenoid; and
Determining whether overcurrent occurs in the auxiliary power control FET for the solenoid
Solenoid power stage monitoring control method performed by .
According to paragraph 1,
The step of changing the element that performs power control of the solenoid from the main power control FET to the auxiliary control FET is,
Controlling the main power control FET to turn off; and
Controlling the auxiliary power control FET on
Solenoid power stage monitoring control method including.
delete delete According to paragraph 1,
To diagnose noise signals that occur while driving a vehicle as errors,
In the step of increasing the continuous diagnosis counter, the diagnosis counter that counts the number of overcurrent diagnoses during unit operation from vehicle start to driving and ignition-off is also increased,
Comparing the diagnosis count counter with a predetermined set diagnosis count, and performing error action if the diagnosis count counter is not greater than the preset set diagnosis count.
A solenoid power stage monitoring control method further comprising:
According to paragraph 1,
If the vehicle speed is greater than 0, the main power control FET is not changed to ON control and the vehicle speed is detected in order to proceed to the next overcurrent detection process.
A solenoid power stage monitoring control method further comprising:
According to paragraph 1,
Immediately after the step of changing from the main power control FET to the auxiliary power control FET,
Step of waiting for a predetermined current tracking maximum delay time
A solenoid power stage monitoring control method that performs.
Main power control FET that supplies vehicle power to the solenoid as driving power;
An auxiliary power control FET that supplies vehicle power to the solenoid instead of the main power control FET; and
In order to prevent overcurrent burnout of the main power control FET, a solenoid power control device that cross-controls the auxiliary power control FET and the main power control FET during overcurrent occurrence diagnosis when an overcurrent occurrence in the solenoid power supply terminal is measured.
Including,
The solenoid power control device,
Check whether the failure diagnosis time has been reached using a continuous diagnosis counter that counts as the number of overcurrent measurements performed repeatedly, and take troubleshooting actions according to the failure diagnosis time.
Whether or not the above fault diagnosis time is reached is,
incrementing a continuous diagnostic counter (counted as the number of overcurrent measurements performed repeatedly);
checking whether the continuous diagnosis counter exceeds a predetermined set diagnosis time;
If a predetermined set diagnosis time is not exceeded, starting the delay counter at 0;
increasing the delay counter; and
If the delay counter is greater than the number of set delay times, proceed to the next solenoid power stage overcurrent measurement.
A solenoid power stage supervisory control system performed by.
According to clause 9,
The solenoid power control device,
monitoring the current to power the solenoid;
If the overcurrent generated in supplying power to the solenoid exceeds a predetermined reference value, starting to count the failure diagnosis time;
Changing the element that performs power control of the solenoid from the main power control FET to the auxiliary control FET;
If the overcurrent remains in a state exceeding a predetermined reference value until the failure diagnosis time is reached, determining a final failure and performing failure measures; and
If the overcurrent falls below the predetermined reference value before reaching the failure diagnosis time, resetting the counted delay time.
A solenoid power end supervisory control system that performs a solenoid power end supervisory control method including.
delete According to clause 10,
The solenoid power control device,
A solenoid power supply monitoring and control system that performs diagnosis of frequently occurring noise signals by applying a diagnosis count counter that counts the number of overcurrent diagnoses during unit operation from vehicle start to driving and ignition off.
According to clause 10,
The solenoid power control device,
A solenoid power stage monitoring 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 clause 10,
The solenoid power control device,
A solenoid power supply monitoring control system that does not perform overcurrent detection for a predetermined maximum current tracking delay time after changing from the main power control FET to the auxiliary power control FET.