JP2005220882A - Emission control device of engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a decrease in cruising distance of a car or the stop of a car which result from the execution of a regeneration of a filter member under such a condition that a small amount of fuel remains in a fuel tank. <P>SOLUTION: An emission control device comprises the filter member which captures exhaust fine particulates in the exhaust gas, an oxidation catalyst which is arranged in an exhaust passage on the upstream side rather than the filter member, an exhaust particulate amount detection means to detect a parameter relating to the amount of the exhaust particulates captured by the filter member, a fuel injection control means which carries out post-injection in a predetermined-period expansion stroke following the main injection performed near the compression stroke top dead center when the amount of the exhaust particulates becomes equal to or larger than a predetermined amount, to thereby regenerate the filter member, and a cruising distance estimating means to presume the cruising distance of the car when the regeneration of the filter member is performed depending on the residual fuel. The fuel injection control means is so constructed that it restrains the post-injection from being performed when the cruising distance is equal to or lower than the predetermined value, thereby inhibiting the regeneration of the filter member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an engine exhaust purification device, and more particularly to an engine exhaust purification device that includes a filter member that captures exhaust particulates in an exhaust passage.

Conventionally, in an engine, for example, a diesel engine, exhaust particulates (particulates) such as carbon contained in exhaust gas can be captured by a filter member arranged in an exhaust passage so as not to be released to the atmosphere, a so-called particulate filter. Has been done.
When the particulate filter is provided in this way, it is necessary to regenerate the particulate filter by burning the captured exhaust particulates when the exhaust particulate amount captured by the particulate filter reaches a saturation capacity that can be captured. There is.
Therefore, in Patent Document 1 below, when the amount of exhaust particulate trapped by the particulate filter exceeds a predetermined value, fuel is additionally injected immediately before the exhaust valve is closed separately from normal fuel injection. The particulate filter flows into the oxidation catalyst disposed upstream of the particulate filter, burns the unburned fuel with the oxidation catalyst, and raises the temperature of the exhaust gas flowing into the particulate filter. It is disclosed that the exhaust particulate trapped in the above is burned and removed.

JP-A-8-42326

However, according to Patent Document 1 described above, since the particulate filter is regenerated by additionally injecting fuel immediately before the exhaust valve is closed, a considerable amount of fuel is consumed.
For example, if the engine speed is 2250 rpm, the additional injection quantity is 20 mm ³ and the regeneration time is 6 minutes, 5.4 liters of fuel will be consumed.
Usually, the occupant determines the fueling timing based on the remaining fuel amount in the fuel tank displayed on the meter.
However, the regeneration of the particulate filter described above is performed regardless of the occupant's intention when the amount of exhaust particulates exceeds a predetermined amount, and therefore fuel consumption that is not predicted by the occupant proceeds in a state where the remaining fuel amount is small, Not only will the following distance be shorter than the occupant's prediction, but if there is no fuel refueling facility nearby, there is a possibility that the vehicle will stop in the worst case.

  The present invention has been made in consideration of the above-described problems, and its object is to reduce the vehicle rear-end distance and stop the vehicle accompanying the regeneration of the filter member when the amount of remaining fuel in the fuel tank is small. An object of the present invention is to provide an exhaust emission control device for an engine that can be suppressed.

In order to achieve the above object, the present invention provides the following solution as a solution. That is, in the first configuration of the present invention, a filter member that is disposed in the exhaust passage of the engine and captures exhaust particulates in the exhaust gas;
An oxidation catalyst disposed in the exhaust passage upstream of the filter member;
Exhaust particulate amount detection means for detecting a parameter related to the amount of exhaust particulate captured by the filter member;
A fuel injection valve for injecting fuel into the combustion chamber of the engine;
Fuel injection control means for controlling the injection timing of fuel injected from the fuel injection valve,
The fuel injection control means performs an expansion stroke for a predetermined period following the main injection injected near the top dead center of the compression stroke when the exhaust particulate quantity detected by the exhaust particulate quantity detection means exceeds a predetermined amount. In an exhaust emission control device for an engine configured to perform post-injection and burn and remove the exhaust particulate captured by the filter member to regenerate the filter member,
A remaining fuel amount detecting means for detecting the remaining fuel amount in the fuel tank;
Subsequent distance estimating means for estimating the subsequent distance of the vehicle when regeneration of the filter member is executed by the fuel injection control means based on the remaining fuel quantity detected by the remaining fuel quantity detecting means,
The fuel injection control means is configured to restrict the regeneration of the filter member by restricting the execution of post-injection when the subsequent distance estimated by the subsequent distance estimating means is less than or equal to a predetermined value.

  According to the first configuration of the present invention, when the remaining fuel amount in the fuel tank is small and it is determined that the following distance of the vehicle is equal to or less than the predetermined value, the regeneration of the filter member is limited. It is possible to suppress a decrease in the vehicle following distance and a vehicle stop associated with execution of filter regeneration in a state where the amount of remaining fuel is small.

In the second configuration of the present invention, destination setting means for enabling the destination to be set by the occupant;
Current position detecting means for detecting the current position of the vehicle;
Map information storage means for storing map information in advance;
The destination set by the destination setting means and the current position detected by the current position detection means are compared with the map information stored in the map storage means to select a travel route to the destination and to the passenger Providing route selection means,
Traffic information obtaining means capable of obtaining traffic information related to engine load information in the traveling direction of the vehicle,
Ease of reproduction of the filter member in the traveling direction of the travel route based on at least one of the map information stored in the map information storage means and the traffic information obtained by the traffic information obtaining means. Reproducibility prediction means for predicting,
The fuel injection control means is configured such that a predetermined period of time for performing the post-injection is lengthened so as to be predicted to be difficult to regenerate by the reproducibility predicting means.
The subsequent distance estimating means is configured to estimate the subsequent distance as short as predicted to be difficult to reproduce by the reproducibility predicting means.

The regeneration of the particulate filter becomes easier as the temperature of the exhaust gas flowing into the particulate filter is higher, in other words, the higher the engine load during regeneration is, and the regeneration time can be shortened.
Whether or not the vehicle can travel in a high engine load state is affected by the traveling environment of the vehicle. For example, when there are many traffic lights / intersections, the vehicle is stopped immediately after starting the vehicle. The travel frequency at high engine load decreases, or the more the downhill, the less the accelerator pedal is depressed. Thus, the traveling frequency at a high engine load decreases.
According to the second configuration of the present invention, the predetermined period for performing the post-injection that is predicted to be difficult to regenerate, that is, the regeneration time is lengthened, so that the regeneration time in consideration of the regeneration efficiency can be secured, and the filter member Can be reliably executed.
In addition, the predetermined period for performing the post-injection is lengthened so that it is predicted that it is difficult to regenerate, and the fuel consumption increases accordingly. Therefore, the subsequent distance is estimated to be short corresponding to the increase in the fuel consumption. In addition, the estimation accuracy of the subsequent distance can be maintained.

In the third configuration of the present invention, a filter member that is disposed in the exhaust passage of the engine and captures exhaust particulates in the exhaust gas;
An oxidation catalyst disposed in the exhaust passage upstream of the filter member;
Exhaust particulate amount detection means for detecting a parameter related to the amount of exhaust particulate captured by the filter member;
A fuel injection valve for injecting fuel into the combustion chamber of the engine;
Fuel injection control means for controlling the injection timing of fuel injected from the fuel injection valve,
The fuel injection control means performs an expansion stroke for a predetermined period following the main injection injected near the top dead center of the compression stroke when the exhaust particulate quantity detected by the exhaust particulate quantity detection means exceeds a predetermined amount. In an exhaust emission control device for an engine configured to perform post-injection and burn and remove the exhaust particulate captured by the filter member to regenerate the filter member,
A remaining fuel amount detecting means for detecting the remaining fuel amount in the fuel tank;
Subsequent distance estimation means for estimating the subsequent distance of the vehicle when regeneration of the filter member is executed by the fuel injection control means based on the remaining fuel quantity detected by the remaining fuel quantity detection means;
Destination setting means that allows the passenger to set the destination;
Current position detecting means for detecting the current position of the vehicle;
Map information storage means for storing map information including fuel supply facility information in advance;
The destination set by the destination setting means and the current position detected by the current position detection means are compared with the map information stored in the map storage means to select a travel route to the destination and to the passenger Providing route selection means,
Fuel refueling facility determining means for determining whether or not there is a fuel refueling facility within the range of the subsequent distance estimated by the subsequent distance estimating means when the amount of exhaust particulate detected by the exhaust particulate amount detecting means exceeds a predetermined amount And
The fuel injection control means is configured to restrict the regeneration of the filter member by restricting the execution of post-injection when the fuel refueling facility judging means determines that there is no fuel refueling facility.

  According to the third configuration of the present invention, when it is determined that the remaining fuel amount in the fuel tank is small and there is no fuel supply facility within the estimated subsequent distance range, the regeneration of the filter member is limited. Therefore, it is possible to suppress a decrease in the vehicle subsequent distance and a vehicle stop that accompany the regeneration of the filter when the amount of remaining fuel in the fuel tank is small.

In the fourth configuration of the present invention, when the exhaust particulate amount detected by the exhaust particulate amount detecting means exceeds a predetermined amount, the destination from the current position of the vehicle on the travel route selected by the travel route selecting means is determined. A reach distance calculating means for calculating a reach distance up to,
First comparison means for comparing the subsequent distance estimated by the subsequent distance estimation means and the arrival distance calculated by the arrival distance calculation means;
A regeneration end point predicting unit that predicts a regeneration end point in the travel route when the filter member is regenerated by the fuel injection control unit,
Even when the fuel injection control means determines that the fuel refueling facility is within the subsequent distance range estimated by the fuel refueling facility determination means, the first comparison means has a reaching distance that is greater than the subsequent distance. When it is determined that there is no refueling facility in the travel route section of the subsequent distance in the traveling direction from the end of regeneration, the regeneration of the filter member is restricted by restricting the execution of post-injection. It is configured as follows.

Here, even when the fuel refueling facility is within the estimated subsequent distance range, depending on the positional relationship between the end of regeneration and the fuel refueling facility, the vehicle may stop due to fuel shortage due to regeneration of the filter member. There is.
In other words, if the fueling facility is at a point before the end of regeneration and there is no fueling facility in the travel route section between the end of regeneration and the following distance, the occupant will run out of fuel at the end of regeneration. Even if it tries to recognize and refuel, there is no fuel refueling facility, so the vehicle is stopped.
According to the fourth configuration of the present invention, even when it is determined that the fuel supply facility is within the subsequent distance range, it is determined that the reach distance is longer than the subsequent distance, and the subsequent time from the end of regeneration is determined. When it is determined that there is no fuel refueling facility in the distance travel route section, the regeneration of the filter member is restricted by restricting the execution of post-injection. You can avoid stopping.

In the fifth configuration of the present invention, when the exhaust particulate amount detected by the exhaust particulate amount detecting means exceeds a predetermined amount, the destination from the current position of the vehicle on the travel route selected by the travel route selecting means is determined. A reach distance calculating means for calculating a reach distance up to,
Comparison means for comparing the subsequent distance estimated by the subsequent distance estimation means with the arrival distance calculated by the arrival distance calculation means;
Fuel refueling facility distance calculating means for calculating the distance from the destination to the fuel refueling facility at the shortest distance around the destination;
The subsequent distance estimated by the subsequent distance estimation means is compared with the distance obtained by adding the arrival distance calculated by the arrival distance calculation means and the distance to the fuel facility calculated by the fuel facility refueling distance calculation means. A second comparing means,
Even if it is determined that there is no fuel refueling facility within the range of the subsequent distance estimated by the fuel refueling facility determining unit, the fuel injection control unit is configured so that the reaching distance is greater than the subsequent distance by the first comparing unit. Is determined to be shorter and the second comparison means determines that the subsequent distance is longer than the distance obtained by adding the arrival distance and the distance to the fuel supply facility, the post-injection is performed and The filter member is configured to be regenerated.

Here, even if there is no fuel supply facility within the estimated subsequent distance range, regeneration may be performed.
In other words, when the arrival distance is shorter than the following distance and there is a fueling facility near the destination, the following distance that can be traveled to the fueling facility near the destination after reaching the destination even if regeneration is performed If there is, it is desired to immediately perform regeneration to suppress clogging of the filter member.
According to the fifth configuration of the present invention, even if it is determined that there is no fuel refueling facility within the range of the subsequent distance estimated by the fuel refueling facility determination unit, the first comparison unit determines that the reach distance is subsequent. When it is determined that the distance is shorter than the distance, and the second comparison means determines that the subsequent distance is longer than the distance obtained by adding the arrival distance and the distance to the fuel supply facility, post-injection is executed. Since the regeneration of the filter member is executed, the filter member can be prevented from being clogged while avoiding the stop of the vehicle.

In the sixth configuration of the present invention, the filter in the direction of travel is based on at least one of the map information stored in the map information storage means and the traffic information obtained by the traffic information obtaining means. A reproduction efficiency predicting means for predicting a reproduction efficiency when executing reproduction of a member;
The fuel injection control means is configured such that the predetermined period for performing the post-injection is lengthened as the regeneration efficiency is predicted to decrease based on the regeneration efficiency predicted by the regeneration efficiency prediction means,
The subsequent distance estimating means is configured to estimate the subsequent distance as short as the reproduction efficiency is predicted to decrease based on the reproduction efficiency predicted by the reproduction efficiency prediction means.

According to the sixth configuration of the present invention, since the predetermined period for performing the post-injection that is predicted to be difficult to regenerate, that is, the regeneration time is lengthened, it is possible to secure the regeneration time considering the ease of regeneration, Regeneration of the filter member can be performed reliably.
In addition, since the predetermined period for performing the post-injection becomes longer and the fuel consumption increases correspondingly as it is predicted to be easily regenerated, the subsequent distance is estimated to be shorter corresponding to the increase in the fuel consumption. In addition, the estimation accuracy of the subsequent distance can be maintained.

  According to the present invention, it is possible to suppress a decrease in the vehicle following distance and a vehicle stop associated with regeneration of the filter member in a state where the amount of remaining fuel in the fuel tank is small.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram relating to the present embodiment, in which 1 is a four-cylinder diesel engine, and an intake passage 2 and an exhaust passage 3 are connected to the diesel engine 1.
In the intake passage 2, an air cleaner 4, an air flow sensor 5, a blower 6 a of a VGT turbocharger (variable geometry turbo) 6, an intercooler 7, an intake throttle valve 8, an intake air temperature are sequentially provided from the upstream side to the downstream side. A sensor 9 and an intake pressure sensor 10 are provided.
In the exhaust passage 3, a turbine 6 b of a VGT turbocharger (variable geometry turbo) 6 sequentially from the upstream side to the downstream side thereof, a movable vane 6 c that controls the flow rate of exhaust gas flowing into the turbine 6 b, and an oxidation catalyst 11. A particulate filter 12 is disposed.
Exhaust pressure sensors 13 and 14 are disposed upstream and downstream of the particulate filter 12, and detect the amount of exhaust particulates accumulated on the particulate filter 12 based on the differential pressure between the exhaust pressure sensors 13 and 14. It is configured as follows.
The particulate filter 12 is provided with a temperature sensor 15.
An exhaust gas recirculation passage 16 that connects the intake passage 2 and the exhaust passage 3 is provided. A negative pressure actuator type exhaust gas recirculation valve 17 and an exhaust gas are disposed in the middle of the exhaust gas recirculation passage 16. And a cooler 18 for cooling with the cooling water.
A fuel injection pump 19 supplies fuel from a fuel tank (not shown) to a common rail 20 as a pressure accumulating means.
The common rail 20 is connected to a fuel injection valve 21 (only one is shown in FIG. 1) disposed in the combustion chamber 1a of each cylinder, and the common rail 20 includes a fuel injection pressure sensor 22 and a common rail 19 interior. A safety valve 23 is provided for opening the valve when the pressure of the fuel accumulated in the tank reaches an allowable pressure or more and relieving the fuel on the fuel tank side.
Reference numeral 50 denotes a control unit for engine control. The above-described various sensors, the engine speed sensor 24, the range position detection sensor 25, the vehicle speed sensor 26, the accelerator pedal sensor 27 for detecting the opening degree of the accelerator pedal, and the opening degree of the brake pedal. Detection signals from a brake pedal sensor 28 that detects the amount of fuel and a fuel level sensor 29 that detects the amount of remaining fuel in a fuel tank (not shown) are input. The various actuators are configured to be controlled.
Reference numeral 60 denotes a navigation control unit, which is set by manual input by the occupant for each signal and display 61 received by the GPS antenna 30 and the receiving antenna 31 for receiving information from outside the vehicle. The destination is input, and the selected travel route is displayed on the display 61 together with the map.

Next, an input / output relationship with various sensors and various actuators for the engine control control unit 50 and the navigation control control unit 60 according to this embodiment will be described with reference to FIG.
The control unit 50 for engine control includes an exhaust pressure sensor 13, 14, an engine speed sensor 24, a range position detection sensor 25 for detecting a shift range position of the automatic transmission, a vehicle speed sensor 26, an accelerator pedal sensor 27, Detection signals from the brake pedal sensor 28 and the fuel level sensor 29 are input.
The control unit 50 for engine control is configured to control the intake throttle valve 8, the movable vane 6c, the exhaust gas recirculation valve 17, and the fuel injection valve 21, respectively, based on various input detection signals.

The regeneration of the particulate filter 12 is achieved by fuel injection control from the fuel injection valve 21.
Specifically, as shown by (a) in FIG. 3, in addition to the main injection injected near the top dead center of the compression stroke, as shown in (b) of FIG. 3, in the expansion stroke after the main injection. Additional injection of a predetermined amount for a predetermined period is performed.
As a result, the temperature of the exhaust gas flowing into the particulate filter 12 can be effectively increased by the oxidation reaction in the post-injection oxidation catalyst 11, and the exhaust particulate trapped by the particulate filter 12 can be burned and removed. The particulate filter 12 can be regenerated.
Further, the engine control control unit 50 predicts the ease of regeneration of the particulate filter 12 in the traveling direction of the travel route selected based on the number of intersections obtained from the navigation control control unit 60, and the like. A predetermined period T in which post-injection is executed according to the prediction, that is, a regeneration period is set, and fuel efficiency E is estimated.
Further, the total post-injection consumption Fm when the post-injection is additionally executed based on the predetermined period T in which the post-injection is executed and the post-injection amount per unit time is calculated.
Then, the subsequent distance D is estimated based on the remaining fuel amount F, the post-injection total consumption amount Fm, and the fuel consumption E detected by the fuel level sensor 29. When the estimated subsequent distance D is equal to or less than the predetermined distance, the fuel injection is performed. The post-injection additional execution from the valve 21 is prohibited.

In addition, the navigation control control unit 60 receives information from the GPS antenna 30 that receives a signal from an artificial satellite and detects the current position of the vehicle, a beacon installed on the side of the road, and a vehicle. Purpose set by manual input by the occupant for each signal and display 61 received by the receiving antenna 31 capable of receiving traffic regulation information, traffic jam information, etc. transmitted from an information center capable of receiving The ground is entered. Further, detection signals from the exhaust pressure sensors 13 and 14 are input via the control unit 50 for engine control.
The control unit 60 for navigation control includes map information storage means 60a that stores map information stored in advance, and includes map information stored in the map information storage means 60a, received traffic regulation information, traffic jam information, and the like. The travel route is selected so as to be the shortest route based on the above, and the selected travel route is displayed on the display 61 together with the map.
The control unit 60 for navigation control is configured to provide the map information stored in the map information storage means 60a and various received information to the control unit 50 for engine control.

(Embodiment 1)
Next, travel route selection control by the navigation control control unit 60 according to the first embodiment will be described with reference to the flowchart of FIG.
In step S1 of FIG. 4, the current position of the vehicle received by the GPS antenna 30, the traffic regulation information received by the receiving antenna 31, traffic jam information and accident information, and map information from the map information storage means 60a in the control unit 60 The number of intersections and road gradient information, and exhaust pressure detected by the exhaust pressure sensors 13 and 14 are read.
In step S2, a travel route that is the shortest route is selected by comparing the input destination and the current position of the vehicle with map information, and in step S3, the travel route selected in step S2 is displayed on the display 61. To do. For example, as shown in FIG. 5, the selected travel route A is displayed.

In step S4, the differential pressure P is calculated based on each exhaust pressure read in step S1, and in step S5, captured by the particulate filter 12 based on the exhaust pressure differential pressure P calculated in step S4. The captured amount M is calculated.
In step S6, it is determined whether the trapped amount M calculated in step S5 is equal to or greater than a first predetermined amount α (for example, a value corresponding to the saturation of the particulate filter 12).
When YES is determined in the step S6, the process proceeds to a step S7, and various kinds of information that the control unit 50 for navigation control including or obtains the number of signals in the traveling direction of the selected travel route A is used for engine control. Output to the control unit 50.
If NO is determined in step S6, the process of step S7 is bypassed and the process returns.

Next, regeneration control of the particulate filter 12 according to the first embodiment will be described based on the flowchart of FIG.
6 includes the detection signals of various sensors such as the exhaust pressure sensors 13 and 14, the engine speed sensor 24, the accelerator pedal sensor 27, the fuel level sensor 29, and the number of signals from the control unit 60 for navigation control. Read various information.
In step S12, the main injection amount of the main injection injected near the top dead center of the compression stroke is set based on the map of the engine speed and the accelerator opening, and the main injection timing is set to the engine speed and the fuel injection. It is set based on a map of the amount (calculated based on the engine speed and the accelerator opening).

In step S13, a differential pressure P is calculated based on each exhaust pressure read in step S11. Subsequently, in step S14, captured by the particulate filter 12 based on the exhaust pressure differential pressure P calculated in step S13. The captured amount M is calculated.
In step S15, it is determined whether or not the trapped amount M calculated in step S14 is greater than or equal to a first predetermined amount α (for example, a value corresponding to saturation of the particulate filter 12).
When YES is determined in the step S15, the process proceeds to a step S16 so as to set a predetermined period T (regeneration time) for executing the post injection according to the number of signals. More specifically, the greater the number of signals, the lower the frequency of travel in an engine high load state in which the particulate filter 12 is easy to regenerate, and it can be predicted that regeneration is difficult. To do.
Further, in step S17, a post-injection total consumption amount Fm when the post-injection T after the predetermined period set in step S16 is executed is calculated. Specifically, it is calculated by multiplying the post-injection amount per unit time by a predetermined period T.
In step S18, the fuel efficiency E is estimated according to the number of signals. Specifically, the fuel efficiency E represents the fuel efficiency with respect to the main injection, and it is considered that the greater the number of signals, the more frequently the vehicle is started and stopped. It is estimated that the greater the fuel consumption, the worse the fuel consumption.
In step S19, the post-injection is executed based on the remaining fuel amount F detected by the fuel level sensor 29, the post-injection total consumption amount Fm calculated in step S17, and the fuel consumption E estimated in step S18. The subsequent distance D in the case is estimated.

In step S20, it is determined whether or not the subsequent distance D estimated in step S19 is greater than or equal to a predetermined distance.
When YES is determined in step S20, that is, when the remaining fuel amount F is large and the subsequent distance D is equal to or larger than the predetermined distance, the process proceeds to step S21, and the post injection amount and the post injection timing are set.
In step S22, the main injection set in step S12 and the post-injection set in step 21 are executed, and the particulate filter 12 is regenerated.
In step S23, a timer for measuring a period for performing the post-injection is counted, and in step S24, it is determined whether or not the timer counted in step S23 is equal to or longer than the predetermined period T set in step S16.
When YES is determined in the step S24, that is, when the predetermined period T for which the post injection is to be executed has not yet elapsed, the process returns before the process of the step S21.
If NO is determined in step S24, that is, if the post-injection is performed for a predetermined period T, the regeneration is terminated in step S25 and the process returns.

  Further, when NO is determined in step S20, that is, when the remaining fuel amount F is small and the vehicle travels by performing post-injection, it is determined that the subsequent distance D that can travel from the current position is shorter than the predetermined distance. In this case, regeneration is prohibited in step S26, and only the main injection set in step S12 is executed in step S27.

When NO is determined in step S15, the process proceeds to step S28, and a second predetermined amount β (for example, approximately 0 equivalent) in which the captured amount M calculated in step S14 is set smaller than the first predetermined amount α. Or less).
When it is determined NO in step S28, the captured amount M is still large, so that the process proceeds to step S29, and it is determined whether regeneration is in progress.
If YES is determined in the step S29, the process proceeds to a step S21 so that the reproduction process is continued thereafter.
If YES is determined in step S28 or NO is determined in step S29, no regeneration is necessary, so that the process proceeds to step 30 and only the main injection set in step S12 is executed.

  As described above, according to the first embodiment, regeneration of the particulate filter 12 is prohibited when it is determined that the amount of remaining fuel in the fuel tank is small and the subsequent distance D of the vehicle is equal to or less than a predetermined distance. Therefore, it is possible to suppress a decrease in the vehicle subsequent distance and a vehicle stop associated with the regeneration execution of the particulate filter 12 in a state where the amount of remaining fuel in the fuel tank is small.

  Further, since the predetermined period T in which the post-injection is performed so that the number of intersections is predicted to be difficult to regenerate the particulate filter 12, that is, the regeneration time is set longer, the regeneration time considering the regeneration efficiency can be secured, The regeneration of the particulate filter 12 can be executed reliably.

  Further, if the predetermined period T for performing the post-injection is set longer as the number of intersections is predicted to be difficult to regenerate the particulate filter 12, the fuel consumption increases accordingly, but this increase in fuel consumption Accordingly, the subsequent distance D is also estimated to be short, so that the estimation accuracy of the subsequent distance D can be maintained.

(Embodiment 2)
Next, Embodiment 2 will be described with reference to FIGS.
In the first embodiment, an example is shown in which uniform regeneration is prohibited when the estimated subsequent distance D is equal to or less than a predetermined distance. However, in the second embodiment, whether regeneration is prohibited is executed in consideration of the presence or absence of a fuel supply facility. An example of determining the above will be shown.
Specifically, the pattern is divided into six patterns shown in FIG. 7, and the distance Da from the current position of the vehicle to the destination, the subsequent distance D estimated from the remaining fuel amount F, and the regeneration end point a predicted to end the regeneration. Based on the presence or absence of the fuel supply facility G, it is determined whether regeneration is prohibited or executed.
Pattern 1: When the distance Da from the current position of the vehicle to the destination is longer than the subsequent distance D and there is no fuel supply facility G in the travel route section of the subsequent distance D, regeneration is prohibited.
Pattern 2: When the distance Da from the current position of the vehicle to the destination is longer than the subsequent distance D and the fuel supply facility G exists in the travel route section from the regeneration end point a to the subsequent distance D in the traveling direction, the regeneration is performed. Executed.
Pattern 3: The distance Da from the current position of the vehicle to the destination is longer than the subsequent distance, and the fuel supply facility G exists in the travel route section of the subsequent distance D, but the subsequent distance in the traveling direction from the regeneration end point a When there is no fuel supply facility G in the travel route section of D, regeneration is prohibited.
Pattern 4: When the distance Da from the current position of the vehicle to the destination is shorter than the subsequent distance D and the fuel supply facility G exists in the travel route section of the subsequent distance D, regeneration is executed.
Pattern 5: The distance Da from the current position of the vehicle to the destination is shorter than the subsequent distance D, and the subsequent distance D is the shortest distance Da from the current position of the vehicle to the destination and the destination to the destination. When the distance is shorter than the sum of the distance Db to the fuel supply facility G, regeneration is prohibited.
Pattern 6: The distance Da from the current position of the vehicle to the destination is shorter than the subsequent distance D, and the subsequent distance D is the distance Da from the current position of the vehicle to the destination and the shortest distance from the destination to the destination. If it is longer than the sum of the distance to the fuel supply facility G, regeneration is executed.
Hereinafter, specific control of the second embodiment will be described based on a flowchart relating to regeneration control of the particulate filter 12 shown in FIG.
The control by the control unit 60 for navigation control is the same as that in the first embodiment, and thus the description thereof is omitted.

The processing from step S31 to step S39 in FIG. 8 is the same as the processing from step S11 to step S19 in FIG.
In step S40, a distance Da from the current position of the vehicle to the destination is calculated.
In step S41, it is determined whether or not the distance Da calculated in step S40 is longer than the subsequent distance D calculated in step S39.
When YES is determined in the step S41, the process proceeds to a step S42 to determine whether or not the fuel supply facility G exists in the travel route section of the subsequent distance D.
When it is determined NO in step S42, that is, when the distance Da from the current position of the vehicle to the destination is longer than the subsequent distance D and there is no fuel supply facility G in the travel route section of the subsequent distance D, If the regeneration is executed, the vehicle may be stopped. Therefore, the process proceeds to step S43, the regeneration is prohibited, and only the main injection is executed in step S44. (Pattern 1)

If YES is determined in the step S42, the process proceeds to a step S45 so as to predict the reproduction end point a when the reproduction is started from the current position of the vehicle. Specifically, it is predicted from the average vehicle speed before a predetermined time and the predetermined period T set in step S36.
In step S46, it is determined whether or not the fuel supply facility G exists in the travel route section of the subsequent distance D from the regeneration end point a predicted in step S45.
When it is determined YES in step S46, that is, the distance Da from the current position of the vehicle to the destination is longer than the subsequent distance D, and the fuel supply facility is in the travel route section from the regeneration end point a to the subsequent distance D in the traveling direction. If G exists, fuel can be supplied after the regeneration is completed even if the remaining fuel amount F decreases. Therefore, the process proceeds to step S47, and after setting the post-injection amount and post-injection timing, in step S48, The main injection set in step S32 and the post-injection set in step S47 are executed to perform regeneration. (Pattern 2)
The post-injection is continued for the predetermined period T set in step S36 by the processing of steps S49 to S51, as in the processing of S23 to S25 of the first embodiment.

  When NO is determined in step S46, that is, the distance Da from the current position of the vehicle to the destination is longer than the subsequent distance D, and the fuel supply facility G is in the travel route section of the subsequent distance D. If the fuel refueling facility G is in front of the regeneration end point a and there is no fuel refueling facility G in the travel route section of the subsequent distance D from the regeneration end point a, fuel cannot be refueled after the regeneration end. Then, the process proceeds to steps S43 and S44 to prohibit reproduction. (Pattern 3)

Moreover, when it determines with NO by step S41, it progresses to step S52 and it is determined whether the fuel supply facility G exists in the travel route area to the destination.
When YES is determined in step S52, that is, when the distance Da from the current position of the vehicle to the destination is shorter than the subsequent distance D and the fuel supply facility G exists in the travel route section of the subsequent distance D, the regeneration is performed. Since it is possible to reach the destination even if is executed, the process proceeds to step S47, and thereafter reproduction is similarly executed in steps S47 to S51. (Pattern 4)

When NO is determined in step S52, the process proceeds to step S53, and a distance Db from the destination to the shortest distance fuel supply facility G existing around the destination is calculated.
In subsequent step S54, it is determined whether or not the subsequent distance D is longer than the distance Da from the current position of the vehicle to the destination plus the distance Db from the destination to the fuel supply facility G at the shortest distance.
When NO is determined in step S54, that is, the distance Da from the current position of the vehicle to the destination is shorter than the subsequent distance D, and the subsequent distance D is equal to the distance Da from the current position of the vehicle to the destination. If the distance Db is shorter than the distance Db to the shortest fuel refueling facility G existing around the destination, the fuel cannot be refueled after reaching the destination, so the process proceeds to step S43. In S44, reproduction is prohibited. (Pattern 5)

  When YES is determined in step S54, that is, the distance Da from the current position of the vehicle to the destination is shorter than the subsequent distance D, and the subsequent distance D is equal to the distance Da from the current position of the vehicle to the destination. If it is longer than the distance obtained by adding the distance from the destination to the shortest fuel refueling facility G existing around the destination, the fuel can be supplied even after reaching the destination while regenerating, and the process proceeds to step S47. Thereafter, similarly, reproduction is executed in steps S47 to S51. (Pattern 6)

When NO is determined in step S35, the process proceeds to step S55, and a second predetermined amount β (for example, substantially zero equivalent) in which the captured amount M calculated in step S34 is set smaller than the first predetermined amount α. Or less).
When NO is determined in step S55, the captured amount M is still large, so that the process proceeds to step S56 and it is determined whether or not regeneration is in progress.
If YES is determined in the step S56, the process proceeds to a step S47 so as to continue the reproduction process thereafter.
If YES is determined in step S55, or if NO is determined in step S56, there is no need for regeneration. Therefore, the process proceeds to step 57, and only the main injection set in step S32 is executed.

  As described above, according to the second embodiment, the pattern 1 in which the distance Da from the current position of the vehicle to the destination is longer than the subsequent distance D and the fuel supply facility G does not exist in the travel route section of the subsequent distance D. In this case, since fuel refueling cannot be performed after the regeneration is completed, regeneration is prohibited, and a decrease in the subsequent distance of the vehicle and regeneration of the vehicle due to regeneration can be suppressed.

  Further, in the case of the pattern 2 where the distance Da from the current position of the vehicle to the destination is longer than the subsequent distance D and the fuel refueling facility G exists in the travel route section of the subsequent distance D in the traveling direction from the regeneration end point a, Since fuel supply after the completion of regeneration is possible, regeneration is executed, and early regeneration of the particulate filter 12 can be performed.

  In addition, although the distance Da from the current position of the vehicle to the destination is longer than the subsequent distance D and the fuel refueling facility G is in the travel route section of the subsequent distance D, the fuel refueling facility G is closer to the regeneration end point a. In the case of the pattern 3 in which the fuel supply facility G does not exist in the travel route section of the subsequent distance D from the regeneration end time point a before the regeneration, since the fuel cannot be refueled after the regeneration, the regeneration is prohibited and the regeneration is performed. A reduction in the following distance of the accompanying vehicle and a vehicle stop can be suppressed.

  Further, in the case of the pattern 4 in which the distance Da from the current position of the vehicle to the destination is shorter than the subsequent distance D and the fuel supply facility G is present in the travel route section of the subsequent distance D, even if regeneration is executed, the destination is Therefore, the regeneration is executed, and the particulate filter 12 can be regenerated early.

  Further, the distance Da from the current position of the vehicle to the destination is shorter than the subsequent distance D, and the subsequent distance D is the distance Da from the current position of the vehicle to the destination and the shortest fuel existing around the destination from the destination. In the case of the pattern 5 which is shorter than the distance obtained by adding the distance Db to the fueling facility G, since fuel cannot be supplied after reaching the destination, regeneration is prohibited, and the following distance of the vehicle is reduced as the regeneration is performed. Stopping can be suppressed.

  Further, the distance Da from the current position of the vehicle to the destination is shorter than the subsequent distance D, and the subsequent distance D is the distance Da from the current position of the vehicle to the destination and the shortest fuel existing around the destination from the destination. In the case of the pattern 6 longer than the distance obtained by adding the distance to the fueling facility G, the fuel can be supplied even after reaching the destination. Therefore, regeneration is performed, and the particulate filter 12 can be regenerated early. it can.

  In addition, since a predetermined period T in which post-injection is performed so that it is predicted that the particulate filter 12 is difficult to regenerate, that is, the regeneration time is set longer, a regeneration time considering the ease of regeneration can be secured, and the particulates The regeneration of the filter 12 can be executed reliably.

  Further, since the predetermined period T in which the post-injection is executed, that is, the regeneration time is set to be long enough to predict that it is difficult to regenerate the particulate filter 12, the fuel consumption increases accordingly. Accordingly, the subsequent distance D is also estimated to be short, so that the estimation accuracy of the subsequent distance D can be maintained.

In the first and second embodiments, the example in which the ease of regenerating the particulate filter 12 is predicted according to the number of intersections, but other predictions are made according to road gradient information, traffic jam information, and time zones. You may do it.
For example, for road gradients, the higher the climb gradient, the higher the frequency of driving in the engine high load state, so it is predicted that it is easier to regenerate, and the greater the degree of congestion, the lower the frequency of driving in the engine high load state. Predicted that it is difficult to regenerate, and when the vehicle's traffic time zone is in the morning or evening commuting time zone, it is predicted that it is difficult to regenerate because the frequency of driving under high engine load conditions is reduced compared to other time zones can do.

In the first and second embodiments, since the regeneration of the particulate filter 12 is prioritized, the regeneration period T is set uniformly as the regeneration period T in which exhaust particulates captured by the particulate filter 12 can be completely removed. Although an example has been shown, the distance from the current position of the vehicle to the fuel supply facility in the travel route section may be calculated, and the regeneration time T may be variably set so as to ensure the calculated distance. .
In this way, it is possible to perform early regeneration of the particulate filter 12 while securing the amount of remaining fuel necessary for the fuel supply facility, and it is possible to suppress clogging of the particulate filter 12.

In the first and second embodiments, the distance Da from the current position of the vehicle to the destination, the subsequent distance D,
Although the calculation and comparison of each distance Db from the destination to the shortest fuel refueling facility G existing around the destination, or the prediction of the regeneration end point a is shown by the engine control control unit 50, At least one or all of these processes may be performed by the control unit 60 for navigation control.

  Further, when the regeneration of the particulate filter 12 is prohibited, a display 61 or a dedicated notification device may be provided to notify the occupant that the regeneration is prohibited.

  In the first and second embodiments, an example in which the engine is applied to a diesel engine has been described. However, the engine may be applied to a gasoline engine.

The whole block diagram concerning the embodiment of the present invention. The figure which shows the input-output relationship with respect to the control unit which concerns on embodiment of this invention. Explanatory drawing of the reproduction | regeneration control which concerns on embodiment of this invention. The flowchart regarding the navigation control which concerns on Embodiment 1 of this invention. The figure which shows the example of a display screen of the driving route which concerns on Embodiment 1 of this invention. 3 is a flowchart regarding reproduction control according to the first embodiment of the present invention. The figure which showed typically the aspect of the regeneration control which concerns on Embodiment 2 of this invention. The flowchart regarding the reproduction | regeneration control which concerns on Embodiment 2 of this invention.

Explanation of symbols

1: diesel engine 11: oxidation catalyst 12: particulate filter (filter member)
13, 14: Exhaust pressure sensor (exhaust particulate quantity detection means)
21: Fuel injection valve 29: Fuel level sensor (remaining fuel amount detection means)
30: GPS antenna (current position detection means)
31: Receiving antenna (means for obtaining traffic information)
50: Control unit for engine control (fuel injection control means, exhaust particulate amount calculation means, subsequent distance estimation means, reach distance calculation means, regeneration end point prediction means, first comparison means, second comparison means)
60: Control unit for navigation control (travel route setting means, fuel supply facility determination means)
60a: Map information storage means 61: Display (destination setting means)

Claims (6)

A filter member disposed in the exhaust passage of the engine and capturing exhaust particulates in the exhaust gas;
An oxidation catalyst disposed in the exhaust passage upstream of the filter member;
Exhaust particulate amount detection means for detecting a parameter related to the amount of exhaust particulate captured by the filter member;
A fuel injection valve for injecting fuel into the combustion chamber of the engine;
Fuel injection control means for controlling the injection timing of fuel injected from the fuel injection valve,
The fuel injection control means performs an expansion stroke for a predetermined period following the main injection injected near the top dead center of the compression stroke when the exhaust particulate quantity detected by the exhaust particulate quantity detection means exceeds a predetermined amount. In an exhaust emission control device for an engine configured to perform post-injection and burn and remove the exhaust particulate captured by the filter member to regenerate the filter member,
A remaining fuel amount detecting means for detecting the remaining fuel amount in the fuel tank;
Subsequent distance estimating means for estimating the subsequent distance of the vehicle when regeneration of the filter member is executed by the fuel injection control means based on the remaining fuel quantity detected by the remaining fuel quantity detecting means,
The fuel injection control means is configured to restrict the regeneration of the filter member by restricting the execution of post-injection when the subsequent distance estimated by the subsequent distance estimating means is less than a predetermined value. An exhaust gas purification device for an engine. Destination setting means that allows the passenger to set the destination;
Current position detecting means for detecting the current position of the vehicle;
Map information storage means for storing map information in advance;
The destination set by the destination setting means and the current position detected by the current position detection means are compared with the map information stored in the map storage means to select a travel route to the destination and to the passenger Providing route selection means,
Traffic information obtaining means capable of obtaining traffic information related to engine load information in the traveling direction of the vehicle,
Ease of reproduction of the filter member in the traveling direction of the travel route based on at least one of the map information stored in the map information storage means and the traffic information obtained by the traffic information obtaining means. Reproducibility prediction means for predicting,
The fuel injection control means is configured such that a predetermined period of time for performing the post-injection is lengthened so as to be predicted to be difficult to regenerate by the reproducibility predicting means.
2. The exhaust emission control device for an engine according to claim 1, wherein the subsequent distance estimating means is configured to estimate the subsequent distance as short as predicted to be difficult to reproduce by the reproducibility predicting means. . A filter member disposed in the exhaust passage of the engine and capturing exhaust particulates in the exhaust gas;
An oxidation catalyst disposed in the exhaust passage upstream of the filter member;
Exhaust particulate amount detection means for detecting a parameter related to the amount of exhaust particulate captured by the filter member;
A fuel injection valve for injecting fuel into the combustion chamber of the engine;
Fuel injection control means for controlling the injection timing of fuel injected from the fuel injection valve,
The fuel injection control means performs an expansion stroke for a predetermined period following the main injection injected near the top dead center of the compression stroke when the exhaust particulate quantity detected by the exhaust particulate quantity detection means exceeds a predetermined amount. In an exhaust emission control device for an engine configured to perform post-injection and burn and remove the exhaust particulate captured by the filter member to regenerate the filter member,
A remaining fuel amount detecting means for detecting the remaining fuel amount in the fuel tank;
Subsequent distance estimation means for estimating the subsequent distance of the vehicle when regeneration of the filter member is executed by the fuel injection control means based on the remaining fuel quantity detected by the remaining fuel quantity detection means;
Destination setting means that allows the passenger to set the destination;
Current position detecting means for detecting the current position of the vehicle;
Map information storage means for storing map information including fuel supply facility information in advance;
The destination set by the destination setting means and the current position detected by the current position detection means are compared with the map information stored in the map storage means to select a travel route to the destination and to the passenger Providing route selection means,
Fuel refueling facility determining means for determining whether or not there is a fuel refueling facility within the range of the subsequent distance estimated by the subsequent distance estimating means when the amount of exhaust particulate detected by the exhaust particulate amount detecting means exceeds a predetermined amount And
The fuel injection control means restricts the regeneration of the filter member by restricting the execution of post-injection when it is determined that there is no fuel refueling facility within the range of the subsequent distance estimated by the fuel refueling facility determining means. An exhaust emission control device for an engine characterized by comprising: The reach distance for calculating the reach distance from the current position of the vehicle to the destination on the travel route selected by the travel route selection means when the exhaust particulate amount detected by the exhaust particulate amount detection means exceeds a predetermined amount A calculation means;
First comparison means for comparing the subsequent distance estimated by the subsequent distance estimation means and the arrival distance calculated by the arrival distance calculation means;
A regeneration end point predicting unit that predicts a regeneration end point in the travel route when the filter member is regenerated by the fuel injection control unit,
Even when the fuel injection control means determines that the fuel refueling facility is within the subsequent distance range estimated by the fuel refueling facility determination means, the first comparison means has a reaching distance that is greater than the subsequent distance. When it is determined that there is no fuel refueling facility in the travel route section of the subsequent distance in the traveling direction from the end of regeneration, the regeneration of the filter member is restricted by restricting the execution of post-injection. The engine exhaust gas purification apparatus according to claim 3, wherein the engine exhaust gas purification apparatus is configured as described above. The reach distance for calculating the reach distance from the current position of the vehicle to the destination on the travel route selected by the travel route selection means when the exhaust particulate amount detected by the exhaust particulate amount detection means exceeds a predetermined amount A calculation means;
First comparison means for comparing the subsequent distance estimated by the subsequent distance estimation means and the arrival distance calculated by the arrival distance calculation means;
Fuel refueling facility distance calculating means for calculating the distance from the destination to the fuel refueling facility at the shortest distance around the destination;
The subsequent distance estimated by the subsequent distance estimation means is compared with the distance obtained by adding the arrival distance calculated by the arrival distance calculation means and the distance to the fuel facility calculated by the fuel facility refueling distance calculation means. A second comparing means,
Even if it is determined that there is no fuel refueling facility within the range of the subsequent distance estimated by the fuel refueling facility determining unit, the fuel injection control unit is configured so that the reaching distance is greater than the subsequent distance by the first comparing unit. Is determined to be shorter and the second comparison means determines that the subsequent distance is longer than the distance obtained by adding the arrival distance and the distance to the fuel supply facility, the post-injection is performed and The engine exhaust gas purification apparatus according to claim 3, wherein the filter member is regenerated. Ease of reproduction of the filter member in the traveling direction of the travel route based on at least one of the map information stored in the map information storage means and the traffic information obtained by the traffic information obtaining means. Reproducibility prediction means for predicting,
The fuel injection control means is configured such that a predetermined period of time for performing the post-injection is lengthened so as to be predicted to be difficult to regenerate by the reproducibility predicting means.
6. The subsequent distance estimating means is configured to estimate the subsequent distance as short as predicted to be difficult to reproduce by the reproducibility predicting means. The engine exhaust gas purification apparatus as described.

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