JP2019044692A - Regeneration control device - Google Patents

Abstract

To provide a regeneration control device capable of inhibiting PM regeneration control from affecting traveling of a vehicle.SOLUTION: A regeneration control device includes: particulate matter amount acquisition section for acquiring the amount of particulate matters collected by a filter in an exhaust system of a vehicle; a road information acquisition section for acquiring road information around the vehicle; a determination section for determining whether regeneration control of the particulate matters collected by the filter is executed based on the amount of the particulate matters and the road information; and a regeneration control section for executing the regeneration control on the basis of a determination result by the determination section.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a regeneration control device that performs regeneration control of particulate matter collected by a filter.

  Conventionally, a regeneration control that is provided in an exhaust system of an internal combustion engine, collects particulate matter (hereinafter referred to as PM (Particulate Matter)) in exhaust gas discharged from the internal combustion engine, and burns the collected PM. There is known an exhaust emission control device that performs the above (for example, see Patent Document 1).

Japanese Patent No. 5338996

  However, when PM regeneration control is performed, the load on the exhaust system increases due to injection of fuel for burning the PM, which may affect the running of the vehicle.

  An object of the present invention is to provide a regeneration control device capable of suppressing the influence of traveling of a vehicle due to regeneration control of PM.

The reproduction control apparatus according to the present invention is
A particulate matter amount acquisition unit for acquiring the amount of particulate matter collected by a filter in the exhaust system of the vehicle;
A road information acquisition unit for acquiring road information around the vehicle;
A determination unit that determines whether to perform regeneration control of the particulate matter collected by the filter based on the particulate matter amount and the road information;
A reproduction control unit that executes the reproduction control based on a determination result of the determination unit;
Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress affecting driving | running | working of a vehicle resulting from regeneration control of PM.

It is a schematic block diagram which shows the exhaust system to which the regeneration control apparatus which concerns on this Embodiment was applied. It is a block diagram which shows the reproduction | regeneration control apparatus which concerns on this Embodiment. It is a flowchart which shows an example of the operation example of reproduction | regeneration control in a reproduction | regeneration control apparatus. It is a figure which shows the relationship between road information and the estimated speed of a vehicle. It is a block diagram which shows the reproduction | regeneration control apparatus which concerns on a modification. It is a flowchart which shows an example of the operation example of the reproduction | regeneration control in the reproduction | regeneration control apparatus which concerns on a modification.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an exhaust system to which the regeneration control apparatus according to the present embodiment is applied. FIG. 2 is a block diagram showing the playback control apparatus according to the present embodiment.

  As shown in FIG. 1, the vehicle 1 is provided with an internal combustion engine 2, an exhaust system 10, a road information storage unit 20, and a regeneration control device 100. The internal combustion engine 2 is a diesel engine, for example, and sends exhaust gas to the exhaust pipe 11 of the exhaust system 10.

In the exhaust pipe 11, an oxidation catalyst 12, a DPF (diesel particulate filter) 13 as an example of a filter, a NO _X purification catalyst 14, and the like are provided in order from the exhaust upstream side. PM sensors 15 are provided in the exhaust pipe 11 upstream of the DPF 13 and the exhaust pipe 11 downstream of the DPF 13.

  The PM sensor 15 detects the amount of PM collected by the DPF 13 and outputs the detected amount of PM to the regeneration control device 100. Note that the PM sensor 15 may be provided in the exhaust pipe 11 on either the upstream side or the downstream side of the DPF 13.

  The road information storage unit 20 stores road information indicating information on the road at the current position of the vehicle 1, information on a road on which the vehicle 1 will travel, and the like, and outputs the road information to the reproduction control device 100.

  The regeneration control device 100 performs regeneration control for burning the PM collected by the DPF 13. The regeneration control device 100 performs regeneration control based on the PM amount detected by the PM sensor 15 and the road information from the road information storage unit 20.

  As illustrated in FIG. 2, the regeneration control apparatus 100 includes a PM amount acquisition unit 110, a road information acquisition unit 120, a determination unit 130, and a regeneration control unit 140 as an example of a particulate matter amount acquisition unit.

  The PM amount acquisition unit 110 acquires the PM amount detected by the PM sensor 15 and outputs the PM amount to the determination unit 130.

  The road information acquisition unit 120 acquires road information from the road information storage unit 20 and outputs the road information to the determination unit 130. The road information acquisition unit 120 may acquire road information received from the outside.

  The determination unit 130 determines whether to perform regeneration control of PM collected by the DPF 13 based on the PM amount and road information. The determination by the determination unit 130 is performed when the amount of PM collected by the DPF 13 is in a range that is greater than or equal to the first predetermined amount and less than the second predetermined amount.

  The first predetermined amount is, for example, a reference PM amount that enables regeneration control when more PM is collected in the DPF 13. The second predetermined amount is a PM amount that is larger than the first predetermined amount and is an upper limit value that can be collected by the DPF 13.

  By the way, when the regeneration control of PM is executed, the load on the exhaust system 10 increases due to injection of fuel for burning PM and the like, which may affect the running of the vehicle 1. .

  For example, when the road on which the vehicle 1 travels is an upward slope, the travel resistance of the vehicle 1 increases. When regeneration control is performed at such a time, a load applied to the vehicle 1 is further added due to the execution of the regeneration control, which affects the traveling of the vehicle 1.

  Accordingly, the determination unit 130 determines that the regeneration control is not executed when the road on which the vehicle 1 travels is an uphill according to the road information and the PM amount is less than the second predetermined amount. Thereby, it can suppress affecting the driving | running | working of the vehicle 1 in an uphill grade. Note that the inclination angle of the gradient in the upward gradient can be arbitrarily set according to the road surface condition or the like.

  Further, in the case of a downward gradient, the gravity load is added to the traveling of the vehicle 1 and the traveling load of the vehicle 1 becomes light. Therefore, it is desirable to actively execute the regeneration control when the vehicle is descending.

  Therefore, the determination unit 130 determines that the regeneration control is to be executed when the slope of the road on which the vehicle 1 travels is a downward slope and the PM amount is equal to or greater than the first predetermined amount based on the road information.

  This reduces the occurrence of an excessive amount of PM trapped in the DPF 13 when the vehicle is going uphill after the downhill, thereby suppressing the influence on the traveling of the vehicle 1. Can do.

  The regeneration control unit 140 can execute the regeneration control of PM when the PM amount is not less than the first predetermined amount and not more than the second predetermined amount, and performs the regeneration control based on the determination result of the determination unit 130. To do. Thereby, the determination result of the determination part 130 can be reflected in execution of reproduction | regeneration control.

  Further, the determination unit 130 determines not to execute the regeneration control when the PM amount is less than the first predetermined amount. When the PM amount is less than the first predetermined amount, the PM is not collected by the DPF 13 as much as regeneration control is performed, and therefore it is possible to suppress wasteful regeneration control. When the PM amount is less than the first predetermined amount, the regeneration control unit 140 may be set not to execute the regeneration control.

  Moreover, the determination part 130 determines with performing regeneration control, when PM amount is a 2nd predetermined amount. This is because when the PM amount is equal to or greater than the second predetermined amount, the regeneration control needs to be performed regardless of the road information because it is equal to or greater than the upper limit value of the PM collection amount in the DPF 13. When the PM amount is the second predetermined amount, the regeneration control unit 140 may be set to automatically perform regeneration control.

  Next, an example of the reproduction control operation in the reproduction control apparatus 100 will be described. FIG. 3 is a flowchart illustrating an example of an operation example of the reproduction control in the reproduction control apparatus 100. The process in FIG. 3 is executed while the vehicle 1 is traveling, for example.

  As illustrated in FIG. 3, the determination unit 130 determines whether or not the PM amount is equal to or greater than a first predetermined amount (step S <b> 101). As a result of the determination, if the PM amount is less than the first predetermined amount (step S101, NO), the process transitions to step S107.

  On the other hand, when the PM amount is greater than or equal to the first predetermined amount (step S101, YES), the determination unit 130 determines whether or not the PM amount is less than the second predetermined amount (step S102). As a result of the determination, if the PM amount is equal to or greater than the second predetermined amount (step S102, NO), the process transitions to step S104.

  On the other hand, when the PM amount is less than the second predetermined amount (step S102, YES), the determination unit 130 determines whether or not the road on which the vehicle 1 is traveling has a downward slope (step S103).

  As a result of the determination, if the road has a downward slope (step S103, YES), the determination unit 130 outputs a regeneration control execution command to the regeneration control unit 140 (step S104). After step S104, the process proceeds to step S107.

  On the other hand, when the road is not downwardly inclined (step S103, NO), the determination unit 130 determines whether or not the road is upwardly inclined (step S105). As a result of the determination, when the road is an uphill slope (step S105, YES), the process returns to step S102.

  On the other hand, when the road is not ascending (step S105, NO), the determination unit 130 determines whether or not to perform regeneration control (step S106).

  As a result of the determination, when it is determined that the regeneration control is to be executed (step S106, YES), the process proceeds to step S104. Note that the determination of execution of regeneration control in step S106 may be performed based on, for example, whether or not the PM amount is a third predetermined amount that is within a range between the first predetermined amount and the second predetermined amount. However, it may be performed so as to always be YES.

  On the other hand, when it determines with not performing reproduction | regeneration control (step S106, NO), the determination part 130 determines whether the vehicle 1 stopped (step S107). Note that the vehicle 1 being stopped means, for example, a state in which a key in the vehicle 1 is turned off.

  As a result of the determination, when the vehicle 1 is not stopped (step S107, NO), the process returns to step S101. On the other hand, when the vehicle 1 is stopped (step S107, YES), this control is ended.

  According to the present embodiment configured as described above, when the determination unit 130 determines that the road on which the vehicle 1 travels is uphill according to the road information and the PM amount is less than the second predetermined amount, regeneration control is performed. Is determined not to be executed. Thereby, it can suppress affecting the driving | running | working of the vehicle 1 in an uphill grade.

  In addition, when the slope of the road on which the vehicle 1 travels according to the road information is a downward slope and the PM amount is equal to or greater than the first predetermined amount, it is determined that the regeneration control is executed. At this time, it is possible to actively control reproduction. This reduces the occurrence of an excessive PM collection amount in the DPF 13 when traveling on a road that is located on an ascending slope after a descending slope, and thus affects the traveling of the vehicle 1. This can be suppressed.

Next, a modified example will be described.
In the vehicle 1, there is a case where control (hereinafter referred to as “coasting control”) that is switched between driving traveling and coasting traveling is performed in accordance with road information and vehicle information. The vehicle information is information indicating the operation content of the driver, the speed of the vehicle 1, and the like. Drive travel is a travel state in which the output shaft of the transmission is connected to a drive source. Inertia traveling is a traveling state in which the output shaft is not connected to a drive source.

  For example, as shown in FIG. 4, the coasting control is executed when a downward gradient exists immediately after the upward gradient from the middle of the upward gradient. The coasting control is executed before the apex position on the condition that the speed of the vehicle 1 is equal to or higher than the allowable minimum speed Vmin at the apex position where the road changes from an ascending gradient to a descending gradient.

  The upper diagram in FIG. 4 shows road information on which the vehicle 1 travels, and the lower diagram shows the estimated speed of the vehicle 1 at each position estimated at the current position L0.

  In the example shown in FIG. 4, for example, when the moving average speed is the target speed V, the vehicle speed during coasting is the allowable maximum speed Vmax = V + V1 or less and the allowable minimum speed Vmin = V−V1 or more. Is set as follows.

  In the example shown in FIG. 4, the coasting control is scheduled to be executed at a position L1 that is some distance away from the current position L0 at the current position L0.

  Specifically, at the position of the current position L0, the estimated speed at the position L1 is within the range from the allowable minimum speed Vmin to the allowable maximum speed Vmax, and the estimated speed at the uphill peak position Lt is the allowable minimum speed Vmin. It is determined whether or not the above condition is satisfied. In the determination, when the condition is satisfied, the coasting control is scheduled to be performed at the position of the position L1.

  In the example shown in FIG. 4, the estimated speed from the position L1 to the position Lt is estimated to gradually decrease due to the upward gradient, and the estimated speed after the position Lt is the downward gradient. It shows a case where it is estimated to increase gradually due to.

  Here, for example, when the coasting control is scheduled to be performed and the regeneration control is performed, a load resulting from the regeneration control is applied to the vehicle 1. Therefore, there is a possibility that the estimated speed does not follow the position L1, and the coasting control, that is, the traveling of the vehicle 1 may be affected.

  In the reproduction control device 100 according to the modification, it is determined whether or not the reproduction control is executed according to whether or not the coasting control is scheduled to be executed. By doing in this way, it can suppress affecting driving | running | working of the vehicle 1 resulting from reproduction | regeneration control. Details of the reproduction control apparatus 100 according to the modification will be described below.

  As illustrated in FIG. 5, the reproduction control apparatus 100 according to the modification includes a vehicle information acquisition unit 150 in addition to the configuration illustrated in FIG. 2. The vehicle information acquisition unit 150 acquires vehicle information that is a parameter related to inertia control of the vehicle 1. The vehicle information includes, for example, an accelerator sensor that detects the amount of depression of the accelerator pedal, a brake switch that detects whether or not the brake pedal is depressed, a shift lever, a turn signal switch, and a vehicle speed that detects the speed of the vehicle 1, although not shown. Information obtained from a sensor or the like. The vehicle information acquisition unit 150 outputs the vehicle information to the determination unit 130.

  The determination unit 130 determines whether the coasting control of the vehicle 1 is scheduled to be executed based on the road information and the vehicle information. Specifically, when determining that the coasting control is scheduled to be executed, the determination unit 130 determines whether to execute the regeneration control according to the distance from the current position to the position where the coasting control is started. .

  When the distance from the current position to the position where coasting control is started is less than a predetermined distance and the PM amount is less than a second predetermined amount, the determination unit 130 does not execute regeneration control. judge. For example, the predetermined distance is set to such a distance that the vehicle 1 does not reach the position L1 between the execution of the regeneration control and the completion thereof.

  By doing so, it is possible to suppress the speed of the vehicle 1 from becoming a speed different from the estimated speed when the position L1 where the coasting control is scheduled to be performed due to the regeneration control is reached. it can. Therefore, since inertial running can be performed as scheduled, it is possible to suppress the influence on the running of the vehicle 1 due to the regeneration control.

  In addition, the determination unit 130 determines to perform the regeneration control when the distance from the current position to the position where the coasting control is started is equal to or greater than a predetermined distance and the PM amount is equal to or greater than the first predetermined amount.

  In this way, since the regeneration control is positively performed at a position some distance away from the position L1 at which the coasting control is started, the regeneration control may be completed at the position L1 at which the coasting control is started. it can. Therefore, since inertial running can be performed as scheduled, it is possible to suppress the influence on the running of the vehicle 1 due to the regeneration control.

  Next, an example of the reproduction control operation in the reproduction control apparatus 100 according to the modification will be described. FIG. 6 is a flowchart showing an example of the operation example of the reproduction control in the reproduction control apparatus 100 according to the modification. The process in FIG. 6 is executed while the vehicle 1 is traveling, for example.

  As illustrated in FIG. 6, the determination unit 130 determines whether or not the PM amount is equal to or greater than a first predetermined amount (step S201). As a result of the determination, if the PM amount is less than the first predetermined amount (step S201, NO), the process transitions to step S207.

  On the other hand, when the PM amount is greater than or equal to the first predetermined amount (step S201, YES), the determination unit 130 determines whether or not the PM amount is less than the second predetermined amount (step S202). If the result of determination is that the PM amount is greater than or equal to the second predetermined amount (step S202, NO), the process transitions to step S205.

  On the other hand, when the PM amount is less than the second predetermined amount (step S202, YES), the determination unit 130 determines whether or not the coasting control is scheduled to be executed (step S203).

  As a result of the determination, when the coasting control is scheduled to be executed (step S203, YES), the determination unit 130 determines whether or not the execution distance that is the distance from the current position L0 to the position where the coasting control is started is equal to or greater than a predetermined distance. Is determined (step S204).

  As a result of the determination, if the execution distance is equal to or greater than the predetermined distance (step S204, YES), the determination unit 130 outputs a regeneration control execution command to the regeneration control unit 140 (step S205). On the other hand, when the execution distance is less than the predetermined distance (step S204, NO), the process proceeds to step S207.

  Returning to the determination in step S203, when the coasting control is not scheduled to be executed (step S203, NO), the determination unit 130 determines whether or not to execute the regeneration control (step S206).

  If the result of determination is that playback control is to be executed (step S206, YES), the process transitions to step S205. Note that the regeneration control execution determination in step S206 may be performed under the same conditions as in step S106 in the flowchart shown in FIG. 3, or based on whether the road on which the vehicle 1 travels is an uphill or a downhill. It may be broken.

  On the other hand, when the regeneration control is not executed (step S206, NO), the determination unit 130 determines whether or not the vehicle 1 has stopped (step S207). As a result of the determination, when the vehicle 1 is not stopped (step S207, NO), the process returns to step S201. On the other hand, when the vehicle 1 is stopped (step S207, YES), this control ends.

  According to the modification configured as described above, the speed of the vehicle 1 becomes a speed different from the estimated speed when reaching the position L1 where the coasting control is scheduled to be performed due to the regeneration control. This can be suppressed. Therefore, since inertial running can be performed as scheduled, it is possible to suppress the influence on the running of the vehicle 1 due to the regeneration control.

  Further, since the regeneration control is positively performed at a position some distance from the position L1 where the coasting control is started, the regeneration control can be completed at the position L1 where the coasting control is started. Therefore, since inertial running can be performed as scheduled, it is possible to suppress the influence on the running of the vehicle 1 due to the regeneration control.

  In addition, each of the above-described embodiments is merely an example of actualization in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

  The regeneration control device according to the present disclosure is useful as a regeneration control device that can suppress the influence on the traveling of the vehicle due to the regeneration control of PM.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Internal combustion engine 10 Exhaust system 11 Exhaust pipe 12 Oxidation catalyst 13 DPF
14 NO _X purification catalyst 15 PM sensor 20 road information storage unit 100 regeneration control device 110 PM amount acquisition unit 120 road information acquisition unit 130 determination unit 140 regeneration control unit

Claims (7)

A particulate matter amount acquisition unit for acquiring the amount of particulate matter collected by a filter in the exhaust system of the vehicle;
A road information acquisition unit for acquiring road information around the vehicle;
A determination unit that determines whether to perform regeneration control of the particulate matter collected by the filter based on the particulate matter amount and the road information;
A reproduction control unit that executes the reproduction control based on a determination result of the determination unit;
A reproduction control apparatus comprising: The regeneration control unit has a range in which the amount of the particulate matter is greater than or equal to the first predetermined amount, greater than the first predetermined amount, and less than or equal to a second predetermined amount that is an upper limit value that can be collected by the filter. The playback control can be executed, and
The determination unit determines whether or not to execute the regeneration control in a range that is greater than or equal to the first predetermined amount and less than the second predetermined amount;
The reproduction control apparatus according to claim 1. The determination unit determines to execute the regeneration control when a road on which the vehicle travels is a downward slope and the amount of the particulate matter is equal to or greater than the first predetermined amount.
The reproduction | regeneration control apparatus of Claim 2. The determination unit determines not to execute the regeneration control when the road is an uphill slope and the amount of the particulate matter is less than the second predetermined amount.
The reproduction | regeneration control apparatus of Claim 2. A vehicle information acquisition unit that acquires vehicle information that is a parameter relating to inertia control of the vehicle;
The determination unit
Determining whether or not the coasting control is scheduled to be executed based on the road information and the vehicle information;
When it is determined that the coasting control is to be executed, it is determined whether to execute the regeneration control according to a distance from a current position to a position where the coasting control is started.
The reproduction | regeneration control apparatus of Claim 2. The determination unit, when the distance from the current position to the position where the coasting control is started is equal to or greater than a predetermined distance, and the amount of particulate matter is equal to or greater than the first predetermined amount, Determining that the reproduction control is to be executed;
The reproduction | regeneration control apparatus of Claim 5. The determination unit, when the distance from the current position to the position where the coasting control is started is less than a predetermined distance, and the amount of the particulate matter is less than the second predetermined amount, Determining that the reproduction control is not executed;
The reproduction | regeneration control apparatus of Claim 5.

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