JP2000024440A - Device for measuring quantity of collected particulates for particulate filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for measuring the quantity of collected particulates by which the clogged state of a particulate filter, that is, the quantity of collected particulates can be accurately measured. SOLUTION: This device for measuring the quantity of collected particulates, by which the quantity of particulates collected by a particulate filter 6 for removing particulates contained in waste gas is measured, is provided with a revolution detecting sensor 16 for detecting the revolution of a diesel engine 2, an exhaust pressure detecting sensor 18 for detecting the exhaust pressure of an exhaust route 4, and a collected-quantity estimating means for estimating the quantity of particulates collected by the particulate filter 6. The collected- quantity estimating means estimates the quantity of particulates collected by the particulate filter 6 based on both the number of the revolutions at the time when the revolution of the engine 2 is changed from a fall to a rise and the minimum of the exhaust pressure to a prescribed time from that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trapping amount measuring device for measuring a trapping amount trapped in a particulate filter for removing particulates contained in exhaust gas of a diesel engine.

[0002]

2. Description of the Related Art Diesel engines have higher thermal efficiency than gasoline engines and use light oil or heavy oil as fuel, so that they are economical to operate and are mounted on large trucks and buses. In recent years, attention has been paid to its driving economy, and it is being installed in small and medium-sized passenger cars.

Since light oil and heavy oil have a higher carbon content than gasoline, when they are used as fuel for diesel engines, unburned particulates, that is, fine carbon powder and mixtures thereof are contained in exhaust gas. This causes problems such as exhaust gas being turned into black smoke and foul odor. Therefore, vehicles equipped with a diesel engine are equipped with a particulate filter in order to remove the particulates contained in the exhaust gas and purify the exhaust gas. The particulate filter includes a filter member for removing particulates in exhaust gas,
This filter member is provided in series in the exhaust path of the diesel engine. By providing the filter member in this manner, the particulates in the exhaust gas are collected by the filter member, and the particulates in the exhaust gas can be removed, thereby purifying the exhaust gas to be discharged.

[0004] In order to collect particulates in exhaust gas, the filter member is clogged by the collected particulates when the operation time of the diesel engine is prolonged. When clogging occurs, the passage resistance when passing through the filter member increases, the exhaust resistance of the exhaust gas increases, and the operating efficiency of the diesel engine decreases.

[0005] In order to prevent a decrease in operating efficiency due to clogging of the filter member, regeneration of the filter member is performed after some operation. The regeneration of the filter member is performed, for example, by supplying combustion air to the filter member while heating the filter member with a heater. In this regeneration, the particulates trapped in the filter member are burned, the particulates are converted into carbon dioxide and water vapor, and the converted carbon dioxide gas and water vapor are discharged through an exhaust path, and thus the filter member The collected particulates are removed.

In order to operate the diesel engine efficiently, it is necessary to detect the clogged state of the filter member and periodically regenerate the filter member. As a device for indirectly detecting a clogged state of a filter member, for example, a device disclosed in JP-A-6-123216 is known. This known device includes a rotational speed detecting means for detecting a rotational speed of a diesel engine, and an exhaust pressure detecting means for detecting an exhaust pressure of exhaust gas (specifically, an exhaust pressure acting on a particulate filter). Operating time integrating means for integrating the operating time of the diesel engine. In this device, the clogged state of the filter member is estimated based on the detection signal of the rotation speed detecting means and the detection signal of the exhaust pressure detecting means. Also,
An exhaust pressure expectation value is obtained based on the integration time of the operation time integration means and the detection signal of the pressure detection means, and an abnormality of the particulate filter is detected based on the exhaust pressure expectation value and the detection pressure of the pressure detection means. I have.

[0007]

However, in the conventional apparatus, the clogged state of the filter member is estimated simply by using the detection signals of the rotational speed detecting means and the exhaust pressure detecting means. It cannot be estimated accurately. That is, the pressure of the exhaust gas of the diesel engine does not follow the fluctuation of the engine rotation, and if the detection signal of the exhaust pressure detection means at the same time as a certain rotation speed is used as it is, the exhaust pressure is not accurately indicated. For this reason, the clogged state of the filter member cannot be accurately estimated.

In order to eliminate such inconvenience, it is conceivable to filter the detection signal of the exhaust pressure detecting means. However, when the filtering is performed, a processing delay occurs. It becomes difficult to accurately estimate the clogging state.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a particulate filter collecting amount measuring apparatus capable of accurately estimating a clogged state of a particulate filter and thereby measuring a collecting amount of the particulate filter. is there.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a trapping amount measuring device for measuring a trapping amount collected by a particulate filter for removing particulates contained in exhaust gas of a diesel engine. Rotation speed detection means for detecting the rotation speed of the diesel engine,
An exhaust pressure detecting means for detecting an exhaust pressure of an exhaust path of the diesel engine; and a trapping amount estimating means for estimating a trapping amount trapped by the particulate filter; The estimating means, when the rotation speed at the time when the rotation speed of the diesel engine changes from falling to rising is smaller than the rotation speed within a predetermined time from the change time, the rotation speed at the change time and the predetermined speed. A trapping amount measuring device for a particulate filter, wherein a trapping amount trapped in the particulate filter is estimated based on a minimum value of the exhaust pressure in a time period.

According to the present invention, the rotational speed of the diesel engine at the time when the rotational speed of the diesel engine changes from decreasing to increasing and the minimum value of the exhaust pressure within a predetermined time from the time of the change are used. The rotational speed of the diesel engine is detected by the rotational speed detecting means, and the exhaust pressure of the exhaust gas is detected by the exhaust pressure detecting means. By using the rotation speed at the change time in this way, it becomes easy to specify the rotation speed to be measured, and by using the minimum value of the exhaust pressure within a predetermined time from this change time, the exhaust pressure corresponding to the rotation speed is obtained. Can be detected, and thus the amount of trapped by the particulate filter can be accurately estimated. When the rotation speed at the change point is smaller than the rotation speed within the predetermined time, it is determined that the rotation speed of the diesel engine is the minimum value, and the trapping amount estimating means determines the rotation speed at the change point and the minimum value of the exhaust pressure. The amount of trapped by the particulate filter is estimated based on. On the other hand, when the rotation speed at the change time becomes larger than the minimum value of the rotation speed within the predetermined time, that is, when the rotation speed within the predetermined time becomes smaller than the rotation speed at the change time, the rotation speed of the diesel engine is reduced. If the number is not the minimum value, the collection amount is not estimated by the collection amount estimation means.

The present invention also relates to a trapping amount measuring apparatus for measuring a trapping amount trapped by a particulate filter for removing particulates contained in exhaust gas of a diesel engine. Means for detecting the number of rotations, exhaust pressure detecting means for detecting the exhaust pressure in the exhaust path of the diesel engine, and trapping for estimating the trapped amount trapped by the particulate filter. A collecting amount estimating unit, wherein the collecting amount estimating unit is configured such that the rotational speed at the time when the rotational speed of the diesel engine changes from rising to decreasing is greater than the rotational speed within a predetermined time from the changing time. The particulate matter based on the rotation speed at the time of the change and the maximum value of the exhaust pressure within the predetermined time. It is a collection quantity measuring device of the particulate filter and estimates the trapped amount trapped by the filter.

According to the present invention, the rotational speed of the diesel engine at the time when the rotational speed of the diesel engine changes from rising to decreasing and the maximum value of the exhaust pressure within a predetermined time from the time of the change are used. The rotational speed of the diesel engine is detected by the rotational speed detecting means, and the exhaust pressure of the exhaust gas is detected by the exhaust pressure detecting means. By using the rotation speed at the change time in this way, it becomes easy to specify the rotation speed to be measured, and by using the maximum value of the exhaust pressure within a predetermined time from this change time, the exhaust pressure corresponding to the rotation speed is obtained. Can be detected, and thus the amount of trapped by the particulate filter can be accurately estimated. In particular, since the rotation speed at the time when the rotation speed changes from rising to falling is used, the rotation speed is high and the exhaust pressure is high, so that the influence of the exhaust gas pulsation can be further reduced. When the rotation speed at the change point is higher than the rotation speed within the predetermined time, the rotation amount at the change point and the maximum value of the exhaust pressure are determined by the trapping amount estimation means as the maximum value of the rotation speed of the diesel engine. The amount of trapped by the particulate filter is estimated based on. On the other hand, when the rotation speed at the time of the change becomes smaller than the maximum value of the rotation speed within the predetermined time, that is, when the rotation speed within the predetermined time becomes larger than the rotation speed at the change time, the rotation of the diesel engine is started. If the number is not the maximum value, the collection amount is not estimated by the collection amount estimation means.

Further, the present invention relates to a trapping amount measuring device for measuring a trapping amount trapped by a particulate filter for removing particulates contained in exhaust gas of a diesel engine. Means for detecting the number of rotations, exhaust pressure detecting means for detecting the exhaust pressure in the exhaust path of the diesel engine, and trapping for estimating the trapped amount trapped by the particulate filter. Collection amount estimating means, the collection amount estimating means, when the rotation speed of the diesel engine is continuously maintained in a predetermined range for a predetermined time,
A trapping amount measuring device for a particulate filter, wherein a trapping amount trapped in the particulate filter is estimated based on the rotation speed and a maximum value of the exhaust pressure within the predetermined time. .

According to the present invention, when the rotation speed of the diesel engine is maintained within the predetermined range for a predetermined time, the range of the rotation speed at that time and the maximum value of the exhaust pressure within the predetermined time are used. The trapping amount estimating means estimates the trapping amount of the particulate filter based on these. The fact that the engine speed is maintained within a predetermined range for a predetermined time means that the engine speed is stable, the influence of fluctuations in the engine speed can be reduced, and the exhaust pressure within the aforementioned predetermined time can be reduced. By using the maximum value, it is possible to detect the exhaust pressure corresponding to the rotation speed in a predetermined range, and thus it is possible to accurately estimate the amount collected by the particulate filter. When the rotation speed of the diesel engine is not maintained within the predetermined range for a predetermined time, it is determined that the rotation speed is not stable, and the collection amount is not estimated by the collection amount estimation unit.

Further, the present invention is further provided with a trapping amount storage means for storing the trapping amount estimated by the trapping amount estimating means, wherein the trapping amount storage means comprises a trapping amount estimating means. The maximum value of the trapping amount estimated by the above is stored and held.

According to the present invention, the collection amount storage means stores the maximum value of the collection amount estimated by the collection amount estimation means. The amount of particulates collected by the particulate filter increases as the operating time of the diesel engine increases, and unless the regeneration or replacement is performed, the collected amount may not substantially decrease. Absent. Therefore, by storing and holding the maximum value of the collection amount by the collection amount storage unit, the influence of a detection error or the like can be reduced.

Further, according to the present invention, a trapping amount calculating means for calculating a trapping amount estimated by the trapping amount estimating means, and a calculated trapping amount calculated by the trapping amount calculating means are stored. And a collection amount storage means for collecting
The collection amount calculating means calculates a new collection amount by calculating the collection amount stored in the collection amount storage means and the collection amount estimated by the collection amount estimation means as required. Is determined.

According to the present invention, the trapping amount calculating means calculates the trapping amount stored in the trapping amount storage means and the trapping amount estimated by the trapping amount estimating means as required, and newly calculates the trapping amount. In order to determine a proper trapping amount, it is possible to accurately estimate the trapping amount of the particulate filter with less influence of the measurement error.

Further, according to the present invention, the collected amount storage means includes:
A maximum value of the trapping amount calculated and estimated by the trapping amount calculating means is stored and held.

According to the present invention, the collection amount storage means stores the maximum value of the collection amount calculated by the collection amount calculation means. As described above, since the amount of particulates collected by the particulate filter increases as the operation time of the diesel engine increases, the maximum value of the collected amount is stored and held by the arithmetically-collected amount storage means. By doing so, the influence of a detection error or the like can be reduced.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an apparatus for measuring a trapped amount of a particulate filter according to the present invention.

First Embodiment FIG. 1 is a block diagram schematically showing a part of a control system of a vehicle provided with a first embodiment of a trapping amount measuring device for a particulate filter according to the present invention. FIG. 2 is a diagram for explaining the operation of estimating the trapping amount in the control system of FIG. 1, and FIG. 3 is a flowchart for explaining the operation of the control system of FIG.

Referring mainly to FIG. 1, an intake path (not shown) and an exhaust path 4 are connected to a diesel engine 2 mounted on a vehicle such as a truck, a bus, or a passenger car. The fuel for combustion is supplied to the engine 2 through the passage, and is directly injected into the engine 2 by, for example, a fuel injection pump (not shown), and the exhaust gas generated by the combustion is discharged to the atmosphere through the exhaust passage 4. .

In the exhaust passage 4, a particulate filter 6 is provided in series. The particulate filter 6 has a container 8 provided in the exhaust path 4, and a filter member 10 is stored in the container 8. A heater 12 for heating the filter member 10 is provided upstream of the filter member 10, and a regenerating device 14 is provided in association with the heater 12. The regenerating device 14 regenerates the filter member 10 using the idle time of the diesel engine 2. When reproducing the filter member 10, the reproducing device 14
Supplies electric power from an external power supply (not shown) to the heater 12, and the heater 12 heats the filter member 10. The filter member 10 may be made of, for example, ceramic, may be made of metal, or may be made of ceramic fiber.

In connection with the diesel engine 2, there is provided a rotation speed detecting means for detecting the rotation speed. The rotational speed detecting means is, for example, a diesel engine 2
The rotation speed detection sensor 16 directly detects the rotation speed of the motor. In addition, a sensor that detects the number of revolutions of the crankshaft of the diesel engine 2, a sensor that detects the number of injections of a fuel injection pump (not shown), a sensor that detects the number of ripples of the exhaust pressure, or the like is used as the number of revolutions detecting means. The rotation speed can be detected using the detection signal of such a sensor.

The exhaust passage 4 is provided with exhaust pressure detecting means for detecting the exhaust pressure of the exhaust gas from the diesel engine 2. The exhaust pressure detecting means comprises an exhaust pressure detecting sensor 18 for directly detecting the exhaust pressure, and in this embodiment, detects a pressure difference from the atmospheric pressure.
This exhaust pressure detection sensor 18 is
Can be arranged at any position from the exhaust side to the high pressure side of the particulate filter 6, and the exhaust pressure is detected in the form of a reading value, a current signal, the number of pulses, a voltage signal, or the like.

The detection signals from the rotation speed detection sensor 16 and the exhaust pressure detection sensor 18 are sent to the control means 20. The control means 20 is composed of, for example, a microprocessor, and estimates the amount of collected particulates collected by the particulate filter 6 as described later.
Display means 22 is provided in connection with the control means 20. The display means 22 is constituted by, for example, a warning lamp or the like, and is turned on based on the reproduction signal generated by the control means 20 when the trapped amount of the particulates in the particulate filter 6 becomes equal to or more than a predetermined value. It informs that the regeneration of the curated filter 6 is necessary.

As another embodiment of the present invention, the display means 2
Reference numeral 2 has a plurality of indicator lights, for example, six LED indicator lights, and selectively turns on each LED indicator light in accordance with the amount of collected particulates in the particulate filter 6, and provides the driver with the particulate filter 6. You may make it notify a collection state. Thereby, the driver can easily grasp the state of the particulate filter 6,
The management of the particulate filter 6 becomes easy.

With this configuration, the exhaust gas generated by operating the diesel engine 2 is discharged through the exhaust path 4. When the exhaust gas flows through the particulate filter 6, the particulate contained in the exhaust gas is collected by the filter member 10, and the exhaust gas from which the particulate has been removed is discharged through the exhaust path 4. When reproducing the particulate filter 6, the reproducing device 14
Is supplied to the heater 12 from the
Heats the filter member 10, and the particulates collected by the filter member 10 are burned to be converted into carbon dioxide gas and water vapor and discharged to the atmosphere through the exhaust path 4. At the time of this regeneration, if necessary, combustion air is supplied to the particulate filter 6, thereby promoting combustion at the time of regeneration.

In the trapping amount measuring apparatus according to the first embodiment, the trapping amount of the particulates collected by the particulate filter 6 is measured as follows. Referring to FIG. 2 together with FIG. 1, in this embodiment, the control means 20 constituting a part of the trapping amount measuring device includes
4. It includes a rotational speed comparing means 26, an exhaust pressure storing means 28 and an exhaust pressure comparing means 30. In this embodiment, the rotation speed comparison unit 26 compares the previously detected rotation speed with the currently detected rotation speed, and determines a change point in time when the rotation speed of the diesel engine 2 changes from falling to rising. For example, as shown in FIG. 2, when the current detected rotational speed is smaller than the previous detected rotational speed and the rotational speed is falling, and the current detected rotational speed is larger than the previous detected rotational speed, The rotation speed comparison means 26 determines the time point at which the rotation speed changes (the rotation speeds N1 and N2 in FIG. 2). The rotation number storage means 24 stores the rotation number of the diesel engine 2, that is, the rotation number detected by the rotation number detection sensor 16, and stores the rotation number at the time when the rotation number changes from falling to rising. When the rotation speed detected by the rotation speed detection sensor 16 becomes smaller than the rotation speed stored in the rotation speed storage unit 24, the rotation speed stored in the rotation speed storage unit 24 is cleared. Further, the exhaust pressure storing means 28 stores the exhaust pressure detected by the exhaust pressure detecting sensor 18, and the exhaust pressure comparing means 30 stores the exhaust pressure stored in the exhaust pressure storing means 28 and the detected exhaust pressure of the exhaust pressure detecting sensor 18. And it is determined that the exhaust pressure detected by the exhaust pressure detection sensor 30 is small, and the exhaust pressure storage means 28 stores the detected exhaust pressure at this time. Therefore, the exhaust pressure storage means 2
8 stores the minimum value of the detected exhaust pressure.

The control means 20 includes a timer 32. The timer 32 determines when the rotation speed of the diesel engine 2 changes from falling to rising (for example, when the rotation speed is N1,
Timing is started from (N2), and is measured for a predetermined time T1 (see FIG. 2), for example, 2 seconds. The timer time T1 of the timer 32 is a period during which the exhaust pressure is measured, and the exhaust pressure storage means 28 stores the minimum value of the exhaust pressure during the predetermined time T1. The predetermined time T1 can be set to an appropriate time for measuring the amount of trapped particulates.

The control means 20 further includes a collection amount estimation means 34, a collection estimation amount storage means 36, a collection amount storage means 38, and a reproduction signal generation means 40. The estimated collection amount storage means 36 stores, for example, the contents shown in Table 1 as a map. That is, the estimated trapping amount storage means 36 stores the relationship between the rotational speed (rpm) of the diesel engine 2, the exhaust pressure of the exhaust gas (mmHg), and the trapped amount of particulates (g / liter). I have.

[0034]

[Table 1]

The collection amount estimating means 34 includes a rotational speed storing means 2
4 based on the rotation speed stored in the storage unit 4 and the exhaust pressure stored in the exhaust pressure storage unit 28.
The collected amount of particulates is read from the map stored in 6, and the read collected amount is estimated as the amount collected by the filter member 10, and the estimated amount is measured as the collected amount. The estimated amount storage means 38 stores the collected amount estimated by the collected amount estimation means 34, and the reproduction signal generation means 4
0 indicates that a reproduction signal is generated when the estimated amount stored in the estimated amount storage means 38 becomes a predetermined value, for example, 15 g / liter or more, and this reproduced signal is sent to the display means 22.

Also, as described above, in the configuration in which the display means 22 has six LED indicators, the reproduction signal generation means 4
0 sends a reproduction signal corresponding to the estimated amount stored in the estimated amount storage means 38 to the display means 22, and the display means 22 turns on each LED display lamp in accordance with the reproduced signal, Can be displayed.

The estimation of the trapping amount by the control means 20 is performed as follows. Referring to FIG. 3 together with FIG.
In step S1, first, it is determined whether or not the rotational speed of the diesel engine 2 has been switched from a lowering state to an increasing state. The change in the rotational speed from the lowering state to the rising state is determined by the rotational speed comparing means 26. You. When the rotation speed of the engine 2 changes from falling to rising, the process proceeds to step S2, and the rotation speed at the time of the change from falling to rising, that is, the rotation speed detected by the rotation speed sensor 16 is stored in the rotation speed storage means 24. Next, the process proceeds to step S3, where the timer 32
Is started, and the exhaust pressure of the exhaust path 4 is detected from the time when the timer 32 starts measuring the time. Next, in step S4, the exhaust pressure of the exhaust path 4, that is, the exhaust pressure detected by the exhaust pressure detection sensor 18, is stored in the exhaust pressure storage unit.

Thereafter, the process proceeds to step S5, where the timer 32
Is determined to be a predetermined time T1, 2 seconds in this embodiment, and if the predetermined time T1 is not measured, the process proceeds from step S5 to step S6. In step S6, the rotation speed of the diesel engine 2 is detected. Then, in step S7, it is determined whether the detected rotation speed is equal to or higher than the rotation speed stored in the rotation speed storage means 24. This determination is made by the rotation speed comparison unit 26. When the detected rotation speed is equal to or higher than the stored rotation speed, the process proceeds to step S8, and the exhaust pressure detection sensor 18 detects the exhaust pressure. Then, in step S9, it is determined whether or not the detected exhaust pressure value is smaller than the exhaust pressure value stored in the exhaust pressure storage means 28. If the detected exhaust pressure is small, the process proceeds to step S10, where the exhaust pressure storage means 28 Is updated to the newly detected exhaust pressure value. On the other hand, if the detected exhaust pressure value is equal to or greater than the stored exhaust pressure value, the exhaust pressure value is not updated, and the exhaust pressure storage means 28 retains the stored exhaust pressure value. Thus, the minimum value of the detected exhaust pressure is stored in the exhaust pressure storage means 28. Step S5 after step S10
Then, the above-described steps S5 to S10 are repeatedly performed for a predetermined time T1.

If the detected rotation speed is smaller than the stored rotation speed in step S7, the process proceeds to step S11.
Then, the rotation speed stored in the rotation speed storage unit 24 is cleared, and the exhaust pressure stored in the exhaust pressure storage unit 28 is cleared in step S12, and thereafter, the process returns to step S1. The fact that the detected rotational speed is lower than the stored rotational speed means that the rotational speed of the diesel engine 2 is not the minimum value, and therefore, the amount of trapped particulates cannot be accurately estimated, and the process returns to step S1. The operation of estimating the trapping amount is performed from the beginning.

When the timer 32 has counted the predetermined time T1 as described above, the process proceeds from step S5 to step S13. In step S13, the timer 32 is reset. Next, in step S <b> 14, the collection amount of the particulate matter collected by the particulate filter 6 is estimated. The estimation of the trapping amount is based on the rotation speed stored in the rotation speed storage means 24, in other words, the predetermined time T.
1, the minimum value (N1, N2) of the rotation speed and the exhaust pressure stored in the exhaust pressure storage means 28, in other words, the minimum value (P1, P2) of the exhaust pressure within the predetermined time T1.
Is performed by reading from the map stored in the estimated collection amount storage means 36 based on the above. For example, the rotation speed of the diesel engine 2 (the rotation speed stored in the rotation speed storage means 24) is 1100 rpm, and the exhaust pressure (differential pressure from the atmospheric pressure) at that time (the exhaust pressure stored in the exhaust pressure storage means 28). ) Is 200 mmHg, the collection amount is 6 mm.
g / liter, and the estimated 6 g / liter is measured as the trapped amount. In this embodiment, the collection amount is estimated using the minimum value of the rotation speed and the minimum value of the exhaust pressure within the predetermined time T1, so that the collection amount can be accurately determined using the rotation speed and the exhaust pressure corresponding thereto. Can be estimated.

When the collection amount is estimated, step S1 is performed.
It is determined whether or not the collection amount estimated in step S14 is larger than the collection amount stored in the estimated amount storage means 38. If the collection amount is large, the process proceeds to step S16 and a new operation is performed. The estimated collection amount is stored in the collection amount storage unit 38 as the collection amount, and then the process proceeds to step S17. On the other hand, if the estimated trapping amount is equal to or smaller than the stored trapping amount, the process directly proceeds from step S15 to step S17, and the trapping amount stored in the trapping amount storage means 38 is not updated.
In general, the trapped amount of particulates increases as the operation time increases, and the trapped amount hardly decreases.In this embodiment, the trapped amounts are equal.
Alternatively, when the size becomes smaller, the trapped amount is excluded because of the measurement error.

Thereafter, in step S17, the trapping amount stored in the estimated amount storage means 38 is set to a predetermined value, for example, 1
It is determined whether it is 5 g / liter or more. If the trapping amount is equal to or more than the predetermined value, the process proceeds to step S18, where the reproduction signal generation unit 40 generates a reproduction signal, the generated reproduction signal is sent to the display unit 22, and the display unit 22 is turned on. As described above, when the amount of the particulates collected by the particulate filter 6 increases, the display means 22
Lights up, and the driver can know that it is time to perform the regeneration work of the particulate filter 6 by such lighting. The display means 22 does not light up until the collection amount reaches a predetermined value.

The above-described operation of estimating the trapping amount is repeatedly performed at a predetermined time interval. When the trapping amount of the particulates of the particulate filter 6 increases, the display means 22 is turned on as described above. . Then, the driver operates the regenerating device 14 to regenerate the particulate filter 6 as described above, and by regenerating, the particulate filter 6 returns to the original state.

As described above, when the display means 22 is configured to have six LED indicators, instead of the operations in steps S17 and S18 described above, the capture amount stored in the estimated amount storage means 38 is replaced. The reproduction signal generation means 40 generates a reproduction signal in accordance with the collected amount, and the generated reproduction signal is sent to the display means 22, and each L of the display means 22 is transmitted.
The ED indicator lights up according to the collected amount. Even with such a configuration, more particulates are collected,
The driver knows that it is time to perform the regeneration operation of the particulate filter 6, and can reproduce the particulate filter 6 by the regeneration device 14. Further, since the driver can grasp the trapping amount, the driver can grasp the state of the particulate filter 6 and the management becomes easy.

Second Embodiment In the first embodiment described above, a predetermined time T1 has elapsed from the point in time when the rotational speed of the diesel engine changes from falling to rising.
Although the amount of trapped particulates is estimated using the minimum value of the rotation speed and the minimum value of the exhaust pressure within the engine, instead of this, a predetermined amount is determined from the time when the rotation speed of the diesel engine changes from rising to falling. The trapped amount of particulates can be estimated using the maximum value of the number of revolutions and the maximum value of the exhaust pressure in time, and in this case, achieved by a configuration substantially similar to the control system of the vehicle shown in FIG. can do. FIG. 4 is a flowchart for explaining an operation of a control system of a vehicle equipped with the measuring device of the second embodiment, and FIG. 5 is a diagram for explaining an operation for estimating a trapping amount in the control. It is.

In the second embodiment, the configuration is substantially the same as that of the first embodiment shown in FIG. 1, and the estimating operation is different.
The estimation operation of the second embodiment will be described with reference to FIG. 1 (refer to FIG. 1 for the configuration).

In the second embodiment, the estimation of the trapping amount by the control means 20 is performed as follows. In step S21, first, it is determined whether or not the rotation speed of the diesel engine 2 has been switched from the rising state to the falling state. The switching from the rising state to the falling state is determined by the rotation speed comparison means 26. When the rotation speed of the engine 2 is switched from rising to falling, the process proceeds to step S22, and the rotation speed at the time of the change from rising to falling is stored in the rotation speed storage unit
Is stored. Next, the process proceeds to step S23, in which the timer 32 starts counting, and the exhaust pressure of the exhaust path 4 is detected from the time when the timer 32 starts counting. Next, in step S24, the exhaust pressure of the exhaust path 4 is stored in the exhaust pressure storage unit.

Thereafter, the flow advances to step S25, where the timer 3
2 is a predetermined time T2 (see FIG. 5) (this predetermined time T2 is
The predetermined time T1 in the first embodiment may be equal to or different from the predetermined time T1). In this embodiment, it is determined whether or not 2 seconds have been measured. The process proceeds from step S25 to step S26. In step S26, the rotation speed of the diesel engine 2 is detected. Then, in step S27, it is determined whether the detected rotation speed is equal to or less than the rotation speed stored in the rotation speed storage means 24. When the detected rotation speed is equal to or lower than the stored rotation speed, the process proceeds to step S28, and the exhaust pressure detection sensor 18 detects the exhaust pressure. And
In step S29, it is determined whether or not the detected exhaust pressure value is greater than the exhaust pressure value stored in the exhaust pressure storage means 28. If the detected exhaust pressure is large, step S3 is performed.
The process proceeds to 0, and the exhaust pressure value stored in the exhaust pressure storage means 28 is updated to the newly detected exhaust pressure value. On the other hand, if the detected exhaust pressure value is equal to or less than the stored exhaust pressure value, the exhaust pressure value is not updated, and the exhaust pressure storage means 28 retains the stored exhaust pressure value. In this way, the maximum value of the detected exhaust pressure is stored in the exhaust pressure storage means 28. After step S30, the process returns to step S25, and the above-described steps S25 to S30 are repeatedly performed for a predetermined time T2.

When the detected rotation speed becomes larger than the stored rotation speed in step S27, step S3 is performed.
The program proceeds to 1 to clear the rotation speed stored in the rotation speed storage means 24, clears the exhaust pressure stored in the exhaust pressure storage means 28 in step S32, and thereafter returns to step S21. The fact that the detected rotation speed is higher than the stored rotation speed means that the rotation speed of the diesel engine 2 is not the maximum value, and therefore, the amount of trapped particulates cannot be estimated accurately, and the process returns to step S21. The operation of estimating the trapping amount is performed from the beginning.

When the timer 32 measures the predetermined time T2 as described above, the process proceeds from step S25 to step S33.
Then, the timer 32 is reset. Next, in step S34, the collection amount of the particulates collected by the particulate filter 6 is estimated. The estimation of the trapping amount is based on the rotation number stored in the rotation number storage means 24, in other words, the maximum value (N3, N4) of the rotation number within the predetermined time T2 and the exhaust pressure stored in the exhaust pressure storage means 28, In other words, it is performed by reading from the map stored in the estimated collection amount storage means 36 based on the maximum value (P3, P4) of the exhaust pressure within the predetermined time T2. In this case, for example, a map having the same contents as in Table 1 can be used. For example, the rotation speed of the diesel engine 2 (the rotation speed stored in the rotation speed storage means 24) is 1500 rpm, and the exhaust pressure (differential pressure from the atmospheric pressure) at that time (the exhaust pressure stored in the exhaust pressure storage means 28). ) Is 300 mmHg, the collection amount is 9 g.
Per liter, and the estimated 9 g / liter is measured as the collected amount. In the second embodiment, the trapping amount is estimated using the maximum value of the rotation speed and the maximum value of the exhaust pressure within the predetermined time T2. Therefore, the trapping amount is estimated using the rotation speed and the exhaust pressure corresponding thereto. It can be accurately estimated.

When the collection amount is estimated, step S3
Then, it is determined whether or not the collection amount estimated in step S34 is larger than the collection amount stored in the estimated amount storage means 38. If the collection amount is large, the process proceeds to step S36, and the process proceeds to step S36. The estimated collection amount is stored in the collection amount storage unit 38 as the collection amount, and then the process proceeds to step S37. On the other hand, if the estimated trapping amount is equal to or smaller than the stored trapping amount, the process directly proceeds from step S35 to step S37, and the trapping amount stored in the trapping amount storage means 38 is not updated.

Thereafter, in step S37, it is determined whether or not the trapped amount stored in the estimated amount storage means 38 is equal to or greater than a predetermined value. When the collection amount is equal to or more than the predetermined value,
Proceeding to step S38, the reproduction signal generation means 40 generates a reproduction signal, the generated reproduction signal is sent to the display means 22, and the display means 22 is turned on. Note that the display unit 22 does not light up until the collection amount reaches the predetermined value.

In the second embodiment as well, the above-described operation of estimating the trapping amount is repeatedly performed at predetermined time intervals. When the trapping amount of the particulates of the particulate filter 6 increases, the display means 22 is displayed. Lights up as described above. Then, the driver operates the regenerating device 14 to regenerate the particulate filter 6 as described above, and by regenerating, the particulate filter 6 returns to the original state.

Also, in the second embodiment, similarly to the first embodiment, the display means 22 may be configured to have six LED display lamps. In this case, in the above-described steps S37 and S38, Instead of the operation, the reproduction signal generation unit 40 generates a reproduction signal in accordance with the trapping amount stored in the estimated amount storage unit 38, and the generated reproduction signal is sent to the display unit 22 for display. Each LED of means 22
The indicator lamp lights up according to the amount collected. Even with such a configuration, the collected particulates increase, and the driver knows that it is time to perform the regeneration work of the particulate filter 6, and the regeneration device 14 reproduces the particulate filter 6. can do. Further, since the driver can grasp the trapping amount, the driver can grasp the state of the particulate filter 6 and the management becomes easy.

Third Embodiment FIG. 6 is a block diagram schematically showing a part of a control system of a vehicle provided with a third embodiment of a trapping amount measuring device for a particulate filter according to the present invention. FIG. 7 is a flowchart for explaining the operation of the control system in FIG. The diesel engine 2 and its related configuration in the third embodiment are substantially the same as those in the first embodiment, and therefore, are denoted by the same reference numerals and description thereof is omitted.

Referring mainly to FIG. 6, the control means 52 in the third embodiment includes a rotation speed range storage means 54, a rotation speed determination means 56, an exhaust pressure storage means 58, and an exhaust pressure comparison means 60. I have. In the third embodiment, the rotation speed range storage means 54 stores the predetermined rotation speed range of the diesel engine 2, specifically, the same range as the rotation speed range stored in the estimated collection amount storage means (described later) ( rp
m), that is, a first range (950 ≦ N ≦ 1050),
The second range (1350 ≦ N ≦ 1450), the third range (1750 ≦ N ≦ 1850), and the fourth range (2150 ≦
N ≦ 2250) and the fifth range (2550 ≦ N ≦ 26)
50) is stored. The range of the number of revolutions can be set as appropriate according to the type of the engine 2 and the like, and many smaller ranges can be provided. The rotation speed determination means 56 determines whether the rotation speed of the diesel engine 2 falls within any of the first to fifth ranges, and if the rotation speed falls within any of the first to fifth ranges, will be described later. The operation of estimating the amount of collected particulates is performed. The exhaust pressure storage means 58 stores the exhaust pressure detected by the exhaust pressure detection sensor 18, and the exhaust pressure comparison means 60 stores the exhaust pressure stored in the exhaust pressure storage means 58 and the exhaust pressure detected by the exhaust pressure detection sensor 18. And it is determined that the exhaust pressure detected by the exhaust pressure detection sensor 18 is large, and the exhaust pressure storage means 58 stores the detected exhaust pressure at this time. Therefore, the exhaust pressure storage means 58 stores the maximum value of the detected exhaust pressure.

The control means 52 further includes a timer 62, a collection amount estimation means 64, a collection estimation amount storage means 66, an estimation amount storage means 68, and a reproduction signal generation means 70, as in the first embodiment. In. The timer 32 starts measuring the time when the rotation speed of the diesel engine 2 falls in any of the first to fifth ranges, and measures a predetermined time, for example, 15 seconds. The time measured by the timer 32 is a period during which the exhaust pressure is measured, and the exhaust pressure storage means 58 stores the maximum value of the exhaust pressure during the predetermined time. The predetermined time in the third embodiment can be set to an appropriate time for measuring the amount of collected particulates, for example, about 1 to 30 seconds.

The estimated collection amount storage means 56 stores, for example, the contents shown in Table 2 as a map. That is, the collection estimated amount storage means 56 stores the relationship between the rotation speed (rpm) of the diesel engine 2, the exhaust pressure of the exhaust gas (mmHg), and the collection amount of particulates (g / liter). I have.

[0059]

[Table 2]

The trapping amount estimating means 64 is based on the rotational speed range of the diesel engine 2 (any one of the first to fifth ranges) and the exhaust pressure stored in the exhaust pressure storing means 58. The collection amount of particulates is read from the map stored in the collection estimation amount storage means 66, and the read collection amount is estimated as the amount collected by the filter member 10, and this estimated amount is used as the collection amount. Measured. The estimated amount storage means 68 stores the collection amount estimated by the collected amount estimation means 64, and the reproduction signal generation means 70 stores the estimated amount stored in the estimated amount storage means 68 at a predetermined value, for example, 15
When the amount becomes g / liter or more, a reproduction signal is generated, and this reproduction signal is sent to the display means 22.

Also, in the second embodiment, as in the first embodiment, the display means 22 may have a configuration having six LED display lamps. In this case, the reproduction signal generation means 70 The reproduction signal corresponding to the estimated amount stored in the amount storage means 68 is sent to the display means 22 and
Can turn on each LED display lamp in response to the reproduction signal, and can display the trapped amount.

The other configuration in the third embodiment is as follows.
It is substantially the same as the first embodiment described above,
The operation of estimating the trapping amount by the control means 52 will be described with reference to FIG. In step S41, first, it is determined whether or not the rotational speed of the diesel engine 2 has fallen into a predetermined set range, that is, any one of the first to fifth ranges. You. When the rotation speed of the engine 2 falls within the set range, step S
Proceeding to 42, the timer 62 starts counting the time, and the exhaust pressure of the exhaust path 4 is detected from the time when the timer 62 starts counting. Next, in step S43, the exhaust path 4
, Ie, the exhaust pressure detected by the exhaust pressure sensor 18 is stored in the exhaust pressure storage means 58.

Thereafter, the process proceeds to step S44, where the timer 6
It is determined whether or not 2 has counted a predetermined time, 15 seconds in this embodiment.
From 44, the process proceeds to step S45. In step S45,
The rotation speed of the diesel engine 2 is detected, and then in step S46, it is determined whether the detected rotation speed has deviated from the set range (any of the first to fifth ranges) entered in step S41. You. This determination is made by the rotation speed determination means 56. If the detected rotation speed is continuously within the set range, the process proceeds to step S47, and the exhaust pressure detection sensor 18 detects the exhaust pressure. Then, in step S48, it is determined whether or not the detected exhaust pressure value is larger than the exhaust pressure value stored in the exhaust pressure storage means 58. If the detected exhaust pressure is large, the process proceeds to step S49, and the exhaust pressure storage means 58 Is updated to the newly detected exhaust pressure value. On the other hand, if the detected exhaust pressure value is equal to or less than the stored exhaust pressure value, the exhaust pressure value is not updated, and the exhaust pressure storage means 58 holds the stored exhaust pressure value. Thus, the maximum value of the detected exhaust pressure is stored in the exhaust pressure storage means 58. After step S49, the process returns to step S44,
Steps S44 to S49 described above are repeatedly performed for a predetermined time.

In step S46, the engine 2
If the number of rotations is out of the above set range, step S50
Then, the exhaust pressure stored in the exhaust pressure storage means 58 is cleared, and the process returns to step S41. Engine 2
That the number of rotations is out of the set range means that the number of rotations is not stable, and therefore the amount of trapped particulates cannot be accurately estimated. The estimation operation is performed from the beginning.

When the timer 62 has counted the predetermined time as described above, the process proceeds from step S44 to step S51. In step S51, the timer 62 is reset. Next, in step S52, the amount of particulates collected by the particulate filter 6 is estimated. The estimation of the trapping amount is based on engine 2
, Ie, the range in which the engine 2 is included in the first to fifth ranges, and the exhaust pressure stored in the exhaust pressure storage means 58, in other words, the maximum exhaust pressure within a predetermined time. This is performed by reading from the map stored in the estimated collection amount storage means 66 based on the values. For example, if the rotational speed of the diesel engine 2 is
If the exhaust pressure (differential pressure from the atmospheric pressure) (exhaust pressure stored in the exhaust pressure storage means 28) at that time is 200 mmHg, the trapping amount is estimated to be 5 g / liter, The collected 5 g / liter is measured as the collected amount. In this embodiment, the trapping amount is estimated using the range of the number of revolutions maintained for a predetermined time and the maximum value of the exhaust pressure within the predetermined time, so that the trapping is performed using the number of revolutions and the corresponding exhaust pressure. Accumulation can be estimated accurately.

When the collection amount is estimated, step S5
Then, it is determined whether or not the collection amount estimated in step S52 is larger than the collection amount stored in the estimated amount storage means 68. If the collection amount is large, the process proceeds to step S54, and the process proceeds to step S54. Is stored in the collection amount storage means 68 as the collection amount, and then the process proceeds to step S55. On the other hand, if the estimated trapping amount is equal to or smaller than the stored trapping amount, the process directly proceeds from step S53 to step S55, and the trapping amount stored in the trapping amount storage means 38 is not updated.

Thereafter, as described above, step S5
In 5, it is determined whether or not the trapping amount stored in the estimated amount storage means 68 is equal to or more than a predetermined value, for example, 15 g / liter. A signal is generated, and the display means 22 is turned on by the reproduced signal.

The above-described operation of estimating the trapping amount is repeatedly performed at a predetermined time interval. When the trapping amount of the particulates of the particulate filter 6 increases, the display means 22 is turned on as described above. The same effect as that of the first embodiment is achieved.

Also, in the third embodiment, when the display means 22 has a configuration having six LED display lamps, the estimated amount storage means 68 is used instead of the operations in steps S55 and S56 described above. In accordance with the collected amount, the reproduction signal generation unit 70 generates a reproduction signal, and the generated reproduction signal is sent to the display unit 22, and each LED indicator of the display unit 22 changes to the collection amount. Lights accordingly. Even with such a configuration, the amount of collected particulates increases, and the driver knows that it is time to perform the regeneration operation of the particulate filter 6, and the regeneration device 14
Thus, the particulate filter 6 can be reproduced. Further, since the driver can grasp the trapping amount, the driver can grasp the state of the particulate filter 6 and the management becomes easy.

Although various embodiments of the trapping amount measuring apparatus according to the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made without departing from the scope of the present invention. Modifications are possible.

For example, in the above-described embodiment, the trapping amount estimated by the trapping amount estimating means is stored in the estimating amount storage means, and the trapping amount estimated by the trapping amount estimating means is thereafter stored in the estimating amount storing means. When the estimated amount is larger than the estimated amount stored in the storage unit, the estimated amount is updated to a larger value. It is also possible to configure so that the data is always updated and stored in the storage means.

For example, in the above-described embodiment,
The estimated amount estimated by the collected amount estimating means is directly estimated as the collected amount. However, in order to more accurately estimate the collected amount, the following configuration can be employed. That is, the control means is further provided with a trapping amount calculating means, and the trapping amount stored in the trapping amount storage means by the trapping amount calculating means and the trapping amount estimated by the trapping amount estimating means are calculated as required. For example, the stored amount and the estimated amount are simply averaged, or the stored amount and the estimated amount and a certain weight (for example, 1:
3 and a weight of 1: 4). In such a case, the calculated trapped amount calculated by the trapped amount calculation means is stored in the estimated amount storage means, and the calculated estimated amount stored in the estimated amount storage means is updated. In this case, it is preferable that the estimated amount storage means stores and holds the maximum value of the collection amount calculated and estimated by the collection amount calculation means, as described above.

[0073]

According to the trapping amount measuring apparatus of the present invention, the rotational speed of the diesel engine at the time when the rotational speed of the diesel engine changes from falling to rising,
The minimum value of the exhaust pressure within a predetermined time from this change point is used. The rotational speed of the diesel engine is detected by the rotational speed detecting means, and the exhaust pressure of the exhaust gas is detected by the exhaust pressure detecting means. By using the rotation speed at the change point in this way, it is possible to easily specify the rotation speed to be used for estimating the trapping amount, and by using the minimum value of the exhaust pressure within a predetermined time from the change time, The corresponding exhaust pressure can be detected, and thus the amount of trapped by the particulate filter can be accurately estimated.

According to the trapping amount measuring apparatus of the second aspect of the present invention, the rotation speed of the diesel engine at the time when the rotation speed of the diesel engine changes from rising to falling, and the rotation speed of the diesel engine within a predetermined time from this time point The maximum value of the exhaust pressure is used. The rotational speed of the diesel engine is detected by the rotational speed detecting means, and the exhaust pressure of the exhaust gas is detected by the exhaust pressure detecting means. By using the rotation speed at the change point in this way, it is possible to easily specify the rotation speed to be used for estimating the trapped amount, and by using the maximum value of the exhaust pressure within a predetermined time from the change time, The corresponding exhaust pressure can be detected, and thus the amount of trapped by the particulate filter can be accurately estimated. In particular, since the rotation speed at the time when the rotation speed changes from rising to falling is used, the rotation speed is high and the exhaust pressure is high, so that the influence of the dynamic range of the exhaust pressure (the setting difference increases when the dynamic range is small) ) Can be reduced.

According to the trapping amount measuring device of the third aspect of the present invention, when the rotational speed of the diesel engine is maintained within the predetermined range for a predetermined period of time, the range of the rotational speed at that time and the predetermined range are determined. The maximum value of the exhaust pressure within the time is used,
The collection amount estimating means estimates the collection amount of the particulate filter based on these. The fact that the engine speed is maintained within a predetermined range for a predetermined time means that the engine speed is stable, the influence of fluctuations in the engine speed can be reduced, and the exhaust pressure within the aforementioned predetermined time can be reduced. By using the maximum value, it is possible to detect the exhaust pressure corresponding to the rotation speed in a predetermined range, and thus it is possible to accurately estimate the amount collected by the particulate filter.

According to the trapping amount measuring device of the present invention, the trapping amount storage means stores the maximum value of the trapping amount estimated by the trapping amount estimating means. The amount of particulates collected by the particulate filter increases as the operating time of the diesel engine increases, and unless the regeneration or replacement is performed, the collected amount may not substantially decrease. Absent. Therefore, by storing and holding the maximum value of the collection amount by the collection amount storage unit, the influence of a detection error or the like can be reduced.

Further, according to the trapping amount measuring apparatus of the present invention, the trapping amount calculating means includes the trapping amount stored in the trapping amount storage means and the trapping amount estimated by the trapping amount estimating means. Since the amount is calculated as required to determine a new trapping amount, the effect of the measurement error can be reduced, and the trapping amount of the particulate filter can be accurately estimated.

Further, according to the trapping amount measuring device of the present invention, the trapping amount storage means stores the maximum value of the trapping amount calculated by the trapping amount calculating means. As described above, since the amount of particulates collected by the particulate filter increases as the operation time of the diesel engine increases, the maximum value of the collected amount is stored and held by the arithmetically-collected amount storage means. By doing so, the influence of a detection error or the like can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a part of a control system of a vehicle including a first embodiment of a trapping amount measuring device for a particulate filter according to the present invention.

FIG. 2 is a diagram for explaining an operation of estimating a trapping amount in the control system of FIG. 1;

FIG. 3 is a flowchart for explaining the operation of the control system of FIG. 1;

FIG. 4 is a flowchart for explaining an operation of a control system of a vehicle including a second embodiment of the trapping amount measuring device for a particulate filter according to the present invention.

FIG. 5 is a diagram for explaining an operation of estimating a trapping amount in a control system that performs the flowchart of FIG. 4;

FIG. 6 is a block diagram schematically showing a part of a control system of a vehicle including a third embodiment of a trapping amount measuring device for a particulate filter according to the present invention.

FIG. 7 is a flowchart for explaining the operation of the control system of FIG. 6;

[Explanation of symbols]

 2 Diesel engine 4 Exhaust path 6 Particulate filter 10 Filter member 12 Heater 14 Regeneration device 16 Revolution detection sensor 18 Exhaust pressure detection sensor 20, 52 Control means 24 Revolution storage means 26 Revolution comparison means 28, 58 Exhaust pressure storage Means 30, 60 Exhaust pressure comparison means 34, 64 Estimated collection amount means 36, 66 Estimated collection amount storage means 38, 68 Estimated amount storage means 54 Revolution speed range storage means 56 Revolution determination means 7

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Kusumoto 1-2-28 Goshodori, Hyogo-ku, Kobe City, Hyogo Prefecture Inside Fujitsu Ten Limited (72) Inventor Yasuhiro Hamasaki 2-1-1 Toyota-cho, Kariya City, Aichi Prefecture F term in Toyota Industries Corporation (reference) 3G090 AA02 BA04 CA01 CB12 DA03 DA18 DB04 4D058 JB03 JB06 NA04 PA20 RA19 SA08 UA01 UA30

Claims (6)

[Claims] 1. A trapping amount measuring device for measuring a trapping amount trapped by a particulate filter for removing particulates contained in exhaust gas of a diesel engine, wherein a rotational speed of the diesel engine is detected. Rotation speed detecting means, exhaust pressure detecting means for detecting the exhaust pressure of the exhaust path of the diesel engine, and trapping amount estimation for estimating the trapping amount trapped by the particulate filter. The trapping amount estimating means, when the rotation speed of the diesel engine at a change point when the rotation speed of the diesel engine has changed from falling to rising is smaller than the rotation speed within a predetermined time from the change time point, Based on the rotation speed at the time of the change and the minimum value of the exhaust pressure within the predetermined time, the particulate matter is captured by the particulate filter. Collection quantity measuring device of the particulate filter and estimates the trapped amount that is. 2. A trapping amount measuring device for measuring a trapping amount trapped by a particulate filter for removing particulates contained in exhaust gas of a diesel engine, wherein a rotational speed of the diesel engine is detected. Rotation speed detecting means, exhaust pressure detecting means for detecting the exhaust pressure of the exhaust path of the diesel engine, and trapping amount estimation for estimating the trapping amount trapped by the particulate filter. The trapping amount estimating means, when the rotation speed of the diesel engine at the time when the rotation speed changes from rising to falling is greater than the rotation speed within a predetermined time from the change time, Based on the rotation speed at the time of change and the maximum value of the exhaust pressure within the predetermined time, the particulate matter is captured by the particulate filter. Collection quantity measuring device of the particulate filter and estimates the trapped amount that is. 3. A trapping amount measuring device for measuring a trapping amount trapped by a particulate filter for removing particulates contained in exhaust gas of a diesel engine, wherein a rotational speed of the diesel engine is detected. Rotation speed detecting means, exhaust pressure detecting means for detecting the exhaust pressure of the exhaust path of the diesel engine, and trapping amount estimation for estimating the trapping amount trapped by the particulate filter. Means, the trapping amount estimating means, when the rotation speed of the diesel engine is maintained for a predetermined time continuously for a predetermined time, the rotation speed and the maximum value of the exhaust pressure within the predetermined time An apparatus for measuring the collection amount of a particulate filter, the collection amount being estimated by the particulate filter based on the estimated amount. 4. A trapping amount storage means for storing the trapping amount estimated by the trapping amount estimating means, wherein the trapping amount storage means is estimated by the trapping amount estimating means. The collection amount measuring device for a particulate filter according to any one of claims 1 to 3, wherein the maximum value of the collection amount is stored and held. 5. A trapping amount calculating means for calculating the trapping amount estimated by the trapping amount estimating means, and a trapping amount for storing the calculated trapping amount calculated by the trapping amount calculating means. Collection amount storage means is further provided, and the collection amount calculation means calculates the collection amount stored in the collection amount storage means and the collection amount estimated by the collection amount estimation means as required. The trapping amount measuring device for a particulate filter according to any one of claims 1 to 3, wherein a new trapping amount is determined by calculating the trapping amount. 6. The trapping means for a particulate filter according to claim 5, wherein said calculated trapping amount storage means stores and holds the maximum value of the trapping amount calculated and estimated by said trapping amount calculating means. Collection measuring device.