JP7232675B2 - INTAKE HOSE DETERIORATION DETERMINATION METHOD AND VEHICLE OPERATION CONTROL DEVICE - Google Patents

Description

The present invention relates to a method for determining deterioration of an intake hose that connects a compressor that constitutes a turbocharger and an engine in a vehicle equipped with a turbocharger, and more particularly to a method that improves reliability and simplifies the configuration.

In internal combustion engines, it is well known that a turbocharger (supercharging device) is used to supercharge the intake air of the internal combustion engine because it is an effective means for reducing emissions. For example, see Patent Document 1, etc.)
Conventionally, rubber hoses (intake hoses) are often used for connection between the compressor that constitutes such a turbocharger and the intake manifold of the engine.

For this reason, deterioration due to environmental conditions, etc., is more likely to occur than those using metal members, leading to intake leaks due to deterioration, and in the worst case, driving due to the suspension of supercharging control. Since there is fear of impossibility, it is necessary to reliably grasp and monitor the state of deterioration.
Conventionally, most of the monitoring of the deteriorated state of the intake hose has been performed visually or by palpation by hand.

JP 2009-168007 A

However, it is generally difficult to objectify judgment criteria for visual inspection and palpation, and the accuracy of judgment largely depends on the skill of the operator, so there is a problem that the reliability of judgment is not constant.

The present invention has been made in view of the above-mentioned actual situation, and makes it possible to objectively and reliably grasp the deterioration of a rubber intake hose without depending on the operator's skill level, and to determine deterioration with high reliability. It is an object of the present invention to provide a method for determining deterioration of an intake hose and a vehicle operation control device that make it possible.

In order to achieve the object of the present invention, the intake hose deterioration determination method according to the present invention includes:
A method for determining deterioration of an intake hose connecting a compressor and an engine constituting a supercharging device mounted on a vehicle,
determining whether or not the intake hose has deteriorated based on the magnitude of expansion of the cross-sectional area of the intake hose according to the boost pressure when boost pressure control is in a steady state ;
In determining whether the intake hose has deteriorated based on the expansion of the cross-sectional area of the intake hose, if the cross-sectional area of the intake hose during supercharging is below a predetermined cross-sectional area expansion threshold, the intake hose Determining that the hose has deteriorated,
The cross-sectional area expansion threshold corresponds to the minimum cross-sectional area that can be determined as normal for the intake hose during supercharging,
The cross-sectional area expansion threshold is corrected based on the intake air temperature and the cooling water temperature, and the corrected cross-sectional area expansion threshold is used for comparison with the calculated cross-sectional area.
Further, in order to achieve the object of the present invention, a vehicle motion control device according to the present invention includes:
A vehicle motion control device having an electronic control unit capable of executing vehicle motion control processing,
The electronic control unit is
The supercharging pressure control of the supercharging device mounted on the vehicle can be executed, and the deterioration determination of the intake hose connecting the compressor and the engine constituting the supercharging device can be executed,
Determination of deterioration of the intake hose is
When the boost pressure control is in a steady state, it is determined whether or not the intake hose has deteriorated based on the magnitude of expansion of the cross-sectional area of the intake hose according to the boost pressure,
The electronic control unit is
In determining whether the intake hose has deteriorated based on the expansion of the cross-sectional area of the intake hose, if the cross-sectional area of the intake hose during supercharging is below a predetermined cross-sectional area expansion threshold value, the intake hose is configured to determine that the deterioration of
The cross-sectional area expansion threshold corresponds to the minimum cross-sectional area that can be determined as normal for the intake hose during supercharging,
Furthermore, the electronic control unit
The cross-sectional area expansion threshold is corrected based on the intake air temperature and the cooling water temperature, and the corrected cross-sectional area expansion threshold is used for comparison with the calculated cross-sectional area.

According to the present invention, deterioration of the intake hose is determined based on the degree of expansion of the cross-sectional area of the intake hose. Therefore, it is possible to ensure objective, more certain and reliable deterioration determination by eliminating unstable factors.

1 is a configuration diagram showing a configuration example of a vehicle motion control device according to an embodiment of the present invention; FIG. 1 is a schematic diagram schematically showing a schematic configuration of an intake hose and its surroundings whose deterioration is determined by a vehicle motion control device according to an embodiment of the present invention; FIG. 4 is a subroutine flowchart showing the procedure of intake hose deterioration determination processing according to the first embodiment of the present invention; It is a table showing an example of a temperature correction coefficient table used for correcting a cross-sectional area expansion threshold value in intake hose deterioration determination processing according to the first embodiment of the present invention. 9 is a subroutine flowchart showing the procedure of intake hose deterioration determination processing according to the second embodiment of the present invention; FIG. 6A is a schematic diagram illustrating a boost pressure rise time used for deterioration determination in intake hose deterioration determination processing according to the second embodiment of the present invention, and FIG. FIG. 6(B) is a schematic diagram for explaining the relationship between the change in supercharging pressure and the boost pressure rise time. It is a table showing an example of a temperature correction coefficient table used in the intake hose deterioration determination process in the second embodiment of the present invention. FIG. 5 is a subroutine flow chart showing a procedure for concurrently executing an intake hose deterioration determination process according to the first embodiment of the present invention and an intake hose deterioration determination process according to a second embodiment of the present invention; FIG. FIG. 4 is a subroutine flow chart showing a procedure when the intake hose deterioration determination process in the first embodiment of the present invention and the intake hose deterioration determination process in the second embodiment are executed in chronological order; FIG.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 9. FIG.
The members, arrangement, etc., described below do not limit the present invention, and can be modified in various ways within the spirit and scope of the present invention.
First, a configuration example of a vehicle motion control device to which an intake hose deterioration determination method according to an embodiment of the present invention is applied will be described with reference to FIGS. 1 and 2. FIG.
A vehicle motion control system according to the embodiment of the present invention is configured with an electronic control unit 100 mounted on a motor vehicle 50 as a main component.

The electronic control unit 100 is configured to be able to execute operation control of the engine 51 as an internal combustion engine, and itself is basically installed in a conventional automobile capable of electronic control. is identical to
That is, the electronic control unit 100 according to the embodiment of the present invention is configured to be able to execute various controls necessary for vehicle running control, such as rotation control of the engine 51 and fuel injection control, as in the conventional art. is assumed.

Furthermore, it is assumed that the motor vehicle 50 in the embodiment of the present invention is equipped with a supercharging device.
That is, intake air compressed by a compressor 52 is supplied to the engine 51 through the intake hose 1 (see FIG. 2). As is well known, this compressor 52 constitutes a supercharger together with a turbine (not shown). Therefore, it is assumed that the electronic control unit 100 is configured to be able to perform the conventional boost pressure control.

An air filter 53 is provided on the upstream side of the intake pipe 5 connected to the compressor 52, and the airflow sensor 2 is provided at an appropriate portion of the air filter 53 (see FIG. 2). . A supercharging pressure sensor 3 is provided at an appropriate portion of the intake hose 1 near an intake port (not shown) of the engine 51 (see FIG. 2).

The electronic control unit 100 includes the engine speed, vehicle speed, cooling water temperature of the engine 51, intake air temperature, and the like detected by sensors (not shown), as well as the intake flow rate detected by the airflow sensor 2 and the boost pressure sensor 3. Various detection signals necessary for operation control of the engine 51 such as supercharging pressure are input and supplied to fuel injection control processing and intake hose deterioration determination processing to be described later.

In addition, the electronic control unit 100 executes intake hose deterioration determination processing as described later, and when it is determined that the intake hose is abnormal, the instrument panel (“INP” in FIG. 1) provided inside the automobile 50 (notated as )) 4 can be executed for notification operation such as turning on the notification lamp 4a.

Next, intake hose deterioration determination processing according to the first embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG.
First, the intake hose deterioration determination process according to the embodiment of the present invention executed by the electronic control unit 100 will be generally described.
The rubber intake hose 1 generally tends to harden as deterioration progresses, but as the hardening increases, cracks are more likely to occur. If it disappears, deterioration of vehicle operation characteristics such as deterioration of exhaust characteristics and deterioration of fuel consumption will be caused.

In the intake hose deterioration determination process according to the embodiment of the present invention, as described above, hardening of the rubber intake hose 1, which causes air leakage, is detected at an early stage, deterioration of supercharging characteristics, and eventually vehicle operating characteristics. This makes it possible to prevent deterioration as much as possible.
For this reason, the inventor of the present application focused on the curing of the rubber intake hose 1, and as a result of diligent testing and research, a difference occurs in the change in the cross-sectional area of the intake hose 1 during supercharging as the curing progresses. I came to find out.

In the intake hose deterioration determination process according to the embodiment of the present invention, the deterioration of the intake hose 1 is determined based on the degree of change in cross-sectional area due to hardening of the rubber intake hose 1 .

Specifically, when the processing is started by the electronic control unit 100, first, it is determined whether or not the intake air temperature, which is one of the determination environmental conditions, exceeds the reference intake air temperature Tin. (see step S310 in FIG. 3).
The reason for judging the intake air temperature in this way is that when the intake air temperature is low, the rubber intake hose 1 tends to harden, and even if the deterioration judgment is made in such a state, it cannot be distinguished from the case of hardening due to deterioration. , it is difficult to obtain an accurate determination result.

If it is determined in step S310 that the intake air temperature has exceeded the reference intake air temperature Tin (if YES), the process proceeds to step S320, which will be described below. On the other hand, if it is determined in step S310 that the intake air temperature does not exceed the reference intake air temperature Tin (in the case of NO), it is determined that the intake hose deterioration determination process is not to be executed, and the series of processes is terminated. Become. It should be noted that after the series of processes is completed, the main routine (not shown) is temporarily returned to, and the execution is started again from step S310 at a predetermined timing.

In step S320, it is determined whether or not the coolant temperature (engine coolant temperature), which is one of the determination environmental conditions, exceeds the reference coolant temperature Twa.
The reason why the cooling water temperature is determined in this way is that when the cooling water temperature is low, it cannot be said that the engine 51 is operating sufficiently. This is because there is a fear that cannot be secured.

Thus, when it is determined in step S320 that the cooling water temperature exceeds the reference cooling water temperature Twa (if YES), the process proceeds to step S330, which will be described below. On the other hand, if it is determined in step S320 that the cooling water temperature does not exceed the reference cooling water temperature Twa (in the case of NO), the series of processes will end, as in step S310.

At step 330, it is determined whether the supercharging control is in a steady state.
Here, the steady state of supercharging pressure control means a state in which the supercharging pressure is maintained at a substantially constant pressure. Since specific judgment criteria differ depending on vehicle specifications, etc., it is preferable to determine them based on test results and simulation results in consideration of them.
As a specific example of judgment criteria, one of the judgment criteria for judging that the boost pressure control is in a steady state is when the fluctuation range of the boost pressure is within ±50 hPa and is maintained for 3 seconds or more. can do.

Thus, if it is determined in step S330 that it is in a steady state (in the case of YES), the process proceeds to step S340. On the other hand, if it is determined in step S330 that the steady state is not established (if NO), the series of processes will end as in step S310.

In step S340, the cross-sectional area of the intake hose 1 is calculated.
That is, the hose cross-sectional area is calculated as follows.
First, assuming that the cross-sectional area of the hose is S and the length of the intake hose 1 is L, the volume V of the air in this hose is expressed by Equation 1 below. It is assumed that the length L of the intake hose 1 remains unchanged from the start of use of the vehicle 50 .

V=S×L Expression 1

Applying the well-known gas equation represented by Equation 2 to Equation 1 to derive a basic equation for calculating the cross-sectional area S of the hose results in Equation 3 below.

PV=n×R×T Expression 2

Here, P is the pressure, specifically the supercharging pressure detected by the supercharging pressure sensor 3 . Also, n is the mass of the gas, that is, the amount of intake air, and more specifically, the value detected by the air flow sensor 2 . Additionally, R is the molar gas constant.

Scurr=Mcurr×R×Tcurr/(Pcurr×L) Expression 3

Here, Mcurr is the amount of intake air (Kg/h) at the time of calculation of the latest hose cross-sectional area Scurr, and the value detected by the airflow sensor 2 is used. Tcurr is the temperature of the intake air at the time when the hose cross-sectional area Scurr is calculated. Specifically, the intake air temperature (° C.) detected by a temperature sensor (not shown) is used. Furthermore, Pcurr is the pressure (hPa) at the time of calculation of the latest hose cross-sectional area Scurr, and specifically, the supercharging pressure detected by the supercharging pressure sensor 3 is used.

In addition, instead of the actual intake air temperature detected by the sensor, the above Tcurr can model the intake air amount and temperature to the intake pipe 5 and calculate the theoretical intake air temperature (model value). A model value calculated based on the intake air temperature model may be used.
In step S340, the latest hose cross-sectional area Scurr is calculated based on Equation (3).

Next, it is determined whether or not the hose cross-sectional area Scurr calculated as described above exceeds the cross-sectional area expansion threshold (see step S350 in FIG. 3).
The intake hose deterioration determination method according to the embodiment of the present invention assumes that the cross-sectional area of the intake hose 1 expands due to supercharging. If the expansion of the cross-sectional area is not sufficient, it is determined that the intake hose 1 is likely to be deteriorated and that the intake hose 1 is out of order.
The cross-sectional area expansion threshold is a criterion for determining whether or not the expansion of the cross-sectional area of the intake hose 1 is normal as described above.

Such a cross-sectional area expansion threshold is preferably determined based on test results and simulation results in consideration of vehicle specifications and the like.
Moreover, since the appropriate value of the cross-sectional area expansion threshold differs depending on the supercharging pressure, it is determined for each main supercharging pressure.

The cross-sectional area expansion threshold value selected for each supercharging pressure in this manner is tabulated as a supercharging pressure/cross-sectional area expansion threshold correspondence table associated with the supercharging pressure, and stored in the electronic control unit 100 as appropriate. It is stored in the area in advance and used.

In step S350, the cross-sectional area expansion threshold corresponding to the supercharging pressure at this time is read from the above-described supercharging pressure/cross-sectional area expansion threshold correspondence table and used. It should be noted that cross-sectional area expansion thresholds for supercharging pressure that are not included in the supercharging pressure/cross-sectional area expansion threshold correspondence table are preferably obtained by, for example, an interpolation method.

Also, the cross-sectional area expansion threshold is usually determined as described above at room temperature. On the other hand, since the cross-sectional area expansion threshold tends to fluctuate depending on the temperature, in step S350, the cross-sectional area expansion threshold read from the supercharging pressure/cross-sectional area expansion threshold correspondence table as described above is set at that point in time. It is preferable to use it after correcting it according to the temperature.
As a specific correction method, for example, a method of multiplying the cross-sectional expansion threshold obtained using the table as described above by a correction coefficient determined according to the temperature at that time can be considered.

In this case, the correction coefficient is, for example, as shown in FIG. 4, with the intake air temperature and the engine cooling water temperature (water temperature) as parameters, and a correction coefficient predetermined for the combination of these two temperatures. is stored in advance in an appropriate storage area of the electronic control unit 100. For combinations of intake air temperature and engine cooling water temperature that are not included in the correction coefficient table, it is preferable to determine corresponding correction coefficients by a so-called interpolation method or the like.

Therefore, when it is determined in step S350 that the hose cross-sectional area Scurr calculated in step S340 exceeds the cross-sectional area expansion threshold value (if YES), it is determined that the intake hose 1 is not abnormal. (Step S360 in FIG. 3), the series of processes is terminated.

On the other hand, if it is determined in step S350 that the hose cross-sectional area Scurr does not exceed the cross-sectional area expansion threshold value (if NO), it is provisionally determined that there is a possibility that an abnormality has occurred in the intake hose 1, and that the number of occurrences of abnormality has decreased. It will be counted (see step S370 in FIG. 3).

If it is determined in step S350 that the hose cross-sectional area Scurr does not exceed the cross-sectional area expansion threshold value (if NO), it is considered that there is a possibility that an abnormality has occurred in the intake hose 1; In consideration of the possibility of erroneous determination due to etc., in the embodiment of the present invention, from the viewpoint of ensuring more certainty and reliability, when the NO determination in step S350 is made a predetermined number of times, the final Generally, it is determined that the intake hose 1 is abnormal.
Therefore, in step S370, the NO determination in step S350 is tentatively taken as the occurrence of an abnormality, and the number of occurrences of abnormality is counted.

Therefore, in step S380, it is determined whether or not the count value of the number of occurrences of abnormality has exceeded the reference number of times Ns. It is assumed that there is an abnormality, and the notification process is executed (see step S390 in FIG. 3).
The notification process means a process, an operation, or the like for informing a vehicle user, driver, or the like that the intake hose 1 has deteriorated (abnormality) by means of sound, display, or the like.

For example, an informing operation such as turning on the informing lamp 4a on the instrument panel 4 provided in the automobile 50 is executed.
It should be noted that, of course, the notification processing is not limited to lighting the notification lamp 4a, and may be performed by displaying a desired figure, characters, etc. on a display device such as a liquid crystal display element, or by ringing a ringing element. is preferably executed by combining them arbitrarily.

Next, a second embodiment of the intake hose deterioration determination method will be described with reference to FIGS. 5 to 7. FIG.
The method for judging deterioration of the intake hose in the first embodiment makes it possible to judge the deterioration of the intake hose 1 when the supercharging pressure is in a steady state. The intake hose deterioration determination method in the embodiment makes it possible to determine the deterioration of the intake hose 1 when the supercharging pressure is in a transient state.

The configuration of the vehicle motion control device to which the intake hose deterioration determination method in the second embodiment is applied is basically the same as the configuration described with reference to FIGS. 1 and 2 in the first embodiment. Since it is assumed that they are the same, the detailed description will be omitted here.

First, the intake hose deterioration determination process in the second embodiment will be generally described.
When the rubber intake hose 1 deteriorates and hardens, the boost pressure rise time during supercharging tends to be shorter than in the normal case. The intake hose deterioration determination in the second embodiment of the present invention focuses on the boost pressure rise time, and determines whether or not the intake hose 1 has deteriorated based on the boost pressure rise time. .

Specifically, when the processing is started by the electronic control unit 100, first, it is determined whether or not the intake air temperature, which is one of the determination environmental conditions, exceeds the reference intake air temperature Tin. (see step S110 in FIG. 5).
The reason for judging the intake air temperature in this way is that when the intake air temperature is low, the rubber intake hose 1 tends to harden, which does not significantly affect the rise time of the supercharging pressure, which is the object of judgment in this deterioration judgment. This is because there is a fear that an accurate judgment cannot be secured without giving.

The determination in step S110 is repeated until it is determined that the intake air temperature exceeds the reference intake air temperature Tin. Then proceed to processing.
In step S120, it is determined whether or not the cooling water temperature (engine cooling water temperature), which is one of the determination environmental conditions, exceeds the reference cooling water temperature Twa.

The reason why the cooling water temperature is determined in this way is that when the cooling water temperature is low, it cannot be said that the engine 51 is operating sufficiently. This is because there is a fear that cannot be secured.

If it is determined in step S120 that the cooling water temperature exceeds the reference cooling water temperature Twa (if YES), the process proceeds to step S130 described below, while the cooling water temperature exceeds the reference cooling water temperature Twa. If it is determined that it does not exceed (NO), the process returns to the previous step S110, and the series of processes is repeated.

At step 130, it is determined whether or not an instruction to increase the boost pressure has been issued.
As described above, the electronic control unit 100 according to the embodiment of the present invention is premised on being able to execute the same boost pressure control process as in the conventional art, and this boost pressure increase instruction is This occurs in the process of executing the supercharging pressure control process.
Therefore, in step S130, there is no need to newly determine whether or not an instruction to increase the boost pressure is necessary. It suffices to apply the presence or absence.

Accordingly, if it is determined in step S130 that an instruction to increase the boost pressure has been issued (if YES), the process proceeds to step S140, which will be described below, while an instruction to increase the boost pressure is issued. If it is determined that it has not (NO), the process returns to the previous step S110, and the series of processes is repeated.

In step S140, measurement of boost pressure rise time Tbup is started.
The measurement of the boost pressure rise time Tbup is continued until it is determined that the boost pressure exceeds the determination reference pressure Pref (see step S150 in FIG. 5), and it is determined that the boost pressure exceeds the determination reference pressure Pref. At the point in time, the boost pressure rise time Tbup is determined.

Now, referring to FIG. 6, the measurement of the boost pressure rise time will be described.
First, the supercharging pressure normally rises relatively slowly from the point at which the supercharging pressure increase instruction is issued until it reaches a certain level of supercharging pressure, and then at a faster rate than before. tend to rise.
This change in boost pressure is basically the same regardless of whether the intake hose 1 is abnormal. It tends to take less time.

For example, in FIG. 6A, an example of change in intake air amount in response to an instruction to increase the boost pressure is indicated by a two-dot chain characteristic line. This example is an example in which an instruction to increase the boost pressure is given at time t1, and the intake air amount increases as the instruction pressure, that is, the target boost pressure increases over time. .

In FIG. 6B, an example of the boost pressure rise characteristic when the intake hose 1 is normal is shown by the solid characteristic line, and the boost pressure rise when the intake hose 1 is deteriorated and hardened. An example of the rising characteristic is indicated by a dashed-dotted characteristic line.
When the intake hose 1 deteriorates, the boost pressure rise time to the judgment reference pressure, which is where the boost pressure increases, varies, and the time tends to become shorter as the deterioration progresses.

In the embodiment of the present invention, attention is focused on the difference in boost pressure rise time caused by the deterioration of the intake hose 1 as described above, and this difference is used for deterioration determination.
That is, as described above, the supercharging pressure at the point where the rate of increase of the supercharging pressure increases more than before, that is, the supercharging pressure at the point corresponding to the inflection point, is set as the judgment reference pressure Pref, and the supercharging pressure increase instruction is given. The time from the point of occurrence until the boost pressure reaches this determination reference pressure is measured as boost pressure rise time Tbup.

The measured boost pressure rise time Tbup is compared with a threshold time as described later (see step S170 in FIG. 5).
Here, the threshold time Tbref is a criterion for determining whether or not the boost pressure rise time Tbup is normal.
For example, in FIG. 6(B), the dotted characteristic line is an example of a change in boost pressure that serves as a reference for determining whether or not the boost pressure rise time Tbup is normal. The time until the supercharging pressure reaches the judgment reference pressure is the threshold time Tbref.

The reference characteristic line, threshold time, and judgment reference pressure differ according to the diameter and length of the intake hose 1 and the gradient (rate of change) of the indicated pressure. It is preferable to take this into consideration and determine based on test results and simulation results.

After the boost pressure rise time Tbup is measured, the threshold time Tbref is corrected (see step S160 in FIG. 5).
As described above, the threshold time Tbref is determined based on test results and simulation results. A temperature is selected that results in relatively ideal pressure control. Therefore, the threshold time Tbref determined in this way should be called a standard value.

Therefore, in the embodiment of the present invention, in order to improve the accuracy of determination, when performing deterioration determination, the threshold time Tbref set in advance as a standard value is corrected using the intake air temperature and the cooling water temperature. The threshold time Tbref thus obtained is used for determination in step S170 described below.

Here, the above-described correction of the threshold time Tbref is performed by multiplying the threshold time Tbref by a correction coefficient. As the correction coefficient, for example, as shown in FIG. 7, a correction coefficient corresponding to the intake air temperature and cooling water temperature at that time is selected from a correction coefficient table that is tabulated in advance based on test results and simulation results. Correction coefficients for combinations other than the combinations of intake air temperature and cooling water temperature listed in the correction coefficient table are preferably obtained using a so-called interpolation method.

That is, if the time obtained by correction is, for example, corrected threshold time Tbref(am), corrected threshold time Tbref(am) is obtained as corrected threshold time Tbref(am)=threshold time Tbref×K. Here, "K" is a correction coefficient, and is a value determined using a correction coefficient table as illustrated in FIG.

The correction coefficient table is constructed so that the corresponding correction coefficients are selected using the intake air temperature and the cooling water temperature as parameters for selection of correction coefficients.
Note that the correction coefficients shown in FIG. 7 are merely examples, and are not limited to these.

Next, it is determined whether or not the boost pressure rise time Tbup exceeds the correction threshold time Tbref(am) (see step S170 in FIG. 5).
When it is determined that the boost pressure rise time Tbup exceeds the correction threshold time Tbref(am) (in the case of YES), it is determined that the intake hose 1 is normal, and the series of processes is terminated. The Rukoto.

On the other hand, when it is determined that the boost pressure rise time Tbup does not exceed the correction threshold time Tbref(am) (in the case of NO), deterioration determination times are counted (see step S190 in FIG. 5).
Determination that the boost pressure rise time Tbup does not exceed the correction threshold time Tbref(am) means that the intake hose 1 has deteriorated. Therefore, it may be possible to immediately determine that there is an abnormality and take necessary safety measures. is performed, the intake hose 1 is determined to be abnormal.

Therefore, in step S190, the number of deterioration determinations, which is the number of times it is determined that the boost pressure rise time Tbup does not exceed the correction threshold time Tbref(am), is counted.
Next, it is determined whether or not the number of deterioration determination times exceeds the reference number (step S200 in FIG. 5). will proceed to the processing of

On the other hand, if it is determined in step S200 that the number of deterioration determination times has not exceeded the reference number of times (if NO), the series of processes is terminated, and the process returns to the main routine (not shown). In the main routine, this series of processing is started again after other required processing is executed.
Since the optimum value of the reference frequency differs depending on the specific specifications of the supercharging device, the length and diameter of the intake hose, etc., it is preferable to determine the reference frequency based on test results, simulation results, and the like.

In step S210, since the number of times of deterioration determination exceeds the reference number of times, it is determined that the intake hose 1 has definitely deteriorated, and an abnormality is determined, and the notification process is executed.
The notification process means a process, an operation, or the like for informing a vehicle user, driver, or the like that the intake hose 1 has deteriorated (abnormality) by means of sound, display, or the like.

For example, an informing operation such as turning on an informing lamp 53a on a dashboard 53 provided in the automobile 50 is executed.
It should be noted that, of course, the notification processing is not limited to lighting the notification lamp 53a, and may be performed by displaying desired graphics, characters, etc. on a display device such as a liquid crystal display element, or by ringing a ringing element. is preferably executed by combining them arbitrarily.

The above-described embodiment is based on the premise that the vehicle motion control device executes only one of the two intake hose deterioration determination processes described above. Both of the hose deterioration determination process may be executed.

Procedures for executing two intake hose deterioration determination processes will be described below with reference to FIGS. 8 and 9. FIG.
First, for the convenience of the following description, the intake hose deterioration determination process, the procedure of which has been described with reference to FIG. Suppose that the whole processing procedure is represented as step S305.
Further, the intake hose deterioration determination process, the procedure of which has been described with reference to FIG. and

First, the processing procedure shown in FIG. 8 will be described.
The processing procedure shown in FIG. 8 shows an example in which the steady-state deterioration determination process and the transient deterioration determination process are executed simultaneously in parallel.
Details of each processing procedure are as described above with reference to FIG. Since it is as described above, detailed description will be omitted here.

Next, the processing procedure shown in FIG. 9 will be described.
The processing procedure shown in FIG. 9 shows an example in which the steady state deterioration determination processing and the transient deterioration determination processing are executed in time series.
That is, in this example, the transient degradation determination process (see step S105 in FIG. 9) and then the steady state degradation determination process (see step S305 in FIG. 9) are sequentially performed.
In this case, after the series of processes in the transient degradation determination process is completed, the steady state degradation determination process is executed without returning to the main routine.

The execution order of the transient degradation determination process and the steady state degradation determination process is not necessarily limited to the order shown in FIG. 9, and the transient degradation determination process is executed after the steady state degradation determination process. Also good.
In this case, in the steady-state deterioration determination process, after a series of processes is completed, the transitional deterioration determination process is executed without returning to the main routine.

Here, from the viewpoint of the magnitude of the load on the processing capacity of the electronic control unit 100, two processes are executed simultaneously in parallel as shown in FIG. Comparing the cases of execution, the electronic control unit 100 The load on the processing power of is large. Therefore, in selecting either the processing procedure shown in FIG. 8 or the processing procedure shown in FIG. is.

It can be applied to vehicles for which it is desired to objectively and reliably grasp the deterioration of the intake hose.

DESCRIPTION OF SYMBOLS 1... Intake hose 2... Air flow sensor 3... Boost pressure sensor 100... Electronic control unit 51... Engine 52... Compressor

Claims (8)

A method for determining deterioration of an intake hose connecting a compressor and an engine constituting a supercharging device mounted on a vehicle,
determining whether or not the intake hose has deteriorated based on the magnitude of expansion of the cross-sectional area of the intake hose according to the boost pressure when boost pressure control is in a steady state;
In determining whether the intake hose has deteriorated based on the expansion of the cross-sectional area of the intake hose, if the cross-sectional area of the intake hose during supercharging is below a predetermined cross-sectional area expansion threshold, the intake hose Determining that the hose has deteriorated,
The cross-sectional area expansion threshold corresponds to the minimum cross-sectional area that can be determined as normal for the intake hose during supercharging,
A method for determining deterioration of an intake hose, comprising: correcting the cross-sectional area expansion threshold based on intake air temperature and cooling water temperature; and using the corrected cross-sectional area expansion threshold for comparison with the calculated cross-sectional area. In the intake hose deterioration determination method according to claim 1 , a second intake hose deterioration determination method is separately executed,
The second intake hose deterioration determination method includes:
When the vehicle operation control device that controls the operation of the supercharging device issues an instruction to increase the boost pressure under a predetermined determination environmental condition, the actual boost pressure reaches the determination reference pressure from the time when the increase instruction is issued. measuring the supercharging pressure rise time until the Hose deterioration judgment method. 3. A method for judging deterioration of an intake hose according to claim 2 , wherein said judging environmental condition is that an intake air temperature exceeds a reference intake air temperature and a cooling water temperature exceeds a reference cooling water temperature. 4. The intake hose according to claim 3 , wherein the threshold time is corrected based on the intake air temperature and the cooling water temperature, and the corrected threshold time, which is the corrected threshold time, is used for comparison with the boost pressure rise time. Degradation judgment method. A vehicle motion control device having an electronic control unit capable of executing vehicle motion control processing,
The electronic control unit is
The supercharging pressure control of the supercharging device mounted on the vehicle can be executed, and the deterioration determination of the intake hose connecting the compressor and the engine constituting the supercharging device can be executed,
Determination of deterioration of the intake hose is
When the boost pressure control is in a steady state, it is determined whether or not the intake hose has deteriorated based on the magnitude of expansion of the cross-sectional area of the intake hose according to the boost pressure,
The electronic control unit is
In determining whether the intake hose has deteriorated based on the expansion of the cross-sectional area of the intake hose, if the cross-sectional area of the intake hose during supercharging is below a predetermined cross-sectional area expansion threshold value, the intake hose is configured to determine that the deterioration of
The cross-sectional area expansion threshold corresponds to the minimum cross-sectional area that can be determined as normal for the intake hose during supercharging,
Furthermore, the electronic control unit
A vehicle characterized in that the cross-sectional area expansion threshold is corrected based on intake air temperature and cooling water temperature, and the corrected cross-sectional area expansion threshold is used for comparison with the calculated cross-sectional area. Motion controller. The vehicle motion control device according to claim 5 ,
The electronic control unit separately enables execution of a second intake hose deterioration determination,
The second intake hose deterioration determination is
It is determined whether or not there is an instruction to increase the supercharging pressure in the supercharging device under predetermined judging environmental conditions. A boost pressure rise time is measured until the determination reference pressure is reached, and if it is determined that the measured boost pressure rise time does not exceed a predetermined threshold time, it is determined that the intake hose has deteriorated. A vehicle motion control device characterized by: When the intake air temperature exceeds the reference intake air temperature and the cooling water temperature exceeds the reference cooling water temperature, the electronic control unit determines whether or not there is an instruction to increase the supercharging pressure assuming that the determination environmental condition is satisfied. 7. The vehicle motion control system of claim 6 , wherein the vehicle motion control system is configured to: The electronic control unit is configured to correct the threshold time based on the intake air temperature and the cooling water temperature, and use the corrected threshold time, which is the threshold time after correction, for comparison with the boost pressure rise time. 8. The vehicle motion control device according to claim 7 , characterized by:

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