JP4423990B2 - Engine exhaust purification system - Google Patents

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 having thus the particulate filter, when the amount of exhaust particulate trapped in Patikyure bets filter reaches saturation capacity available captured, burned the captured exhaust particulates, necessary to regenerate particulate filter 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 mm3, and the regeneration time requires 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, If the travel distance is not only shorter than the occupant of prediction, there is no refueling facilities nearby, there is a risk of falling worst, the vehicle is stopped.

The present invention has been made in consideration of the above-described problems, and its purpose is to reduce the vehicle travel 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;
Travel distance estimation means for estimating a travel distance that can be traveled from the current position of the vehicle when the fuel injection control means performs regeneration of the filter member based on the remaining fuel amount detected by the remaining fuel amount detection means And
The fuel injection control means, when the running distance estimated by said running distance estimating means is less than the predetermined value, by limiting the execution of the post injection are configured so as to restrict the regeneration of the filter member.

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 travel 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 travel distance and a vehicle stop associated with the regeneration of the filter 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 travel distance estimating means is configured to estimate the travel 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 travel distance is estimated to be short according to the increase in the fuel consumption. The estimation accuracy of the travel 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;
Travel distance estimation means for estimating a travel distance that can be traveled from the current position of the vehicle when the fuel injection control means performs regeneration of the filter member based on the remaining fuel amount detected by the remaining fuel amount detection means When,
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 determination means for determining whether or not there is a fuel refueling facility within the range of travel distance estimated by the travel distance estimation means when the exhaust particulate amount detected by the exhaust particulate amount detection 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 amount of remaining fuel in the fuel tank is small and there is no fuel supply facility within the estimated travel distance, regeneration of the filter member is restricted. Therefore, it is possible to suppress a decrease in the vehicle travel 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,
A first comparison means for comparing the arrival distance calculated by the travel distance and the travel distance calculating means which is estimated by the running distance estimator,
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 travel distance range estimated by the fuel refueling facility determination means, the first comparison means causes the reach distance to be greater than the travel distance. It is judged long, and when it is determined that there is no fuel filling stations in the travel path in a section of the travel distance in the traveling direction from the playback end point, limiting the reproduction of the filter member to restrict the execution of the post injection It is configured to do.

Here, even if in the estimated travel distance range there is refueling facility, reproduced by the positional relationship between the end and the refueling facilities, leading to the vehicle is stopped by a fuel shortage due to the regeneration of the filter member risk There is.

In other words, if the fueling facility is at a point in time before the end of regeneration and there is no fueling facility in the travel route section between the end of regeneration and the travel 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 a fourth aspect of the present invention, even when it is determined that there is refueling facilities within travel distance range, it is determined that the arrival distance is longer than traveling distance and traveling from the playback end time 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,
Comparing means for comparing the arrival distance calculated by the travel distance and the travel distance calculating means which is estimated by the running distance estimator,
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;
Comparing the running distance estimated by the travel distance estimating means, and a distance obtained by adding the distance to the fuel property calculated by arrival distance and the fuel property fueling distance calculation means calculated by the arrival distance calculation means A second comparing means,
Even if it is determined that there is no fuel refueling facility within the range of the travel distance estimated by the fuel refueling facility determination unit, the fuel injection control unit has an arrival distance that is greater than the travel distance by the first comparison unit. is determined also short, and when the traveling distance Ri by the said second comparison means is determined to longer than the distance obtained by adding the distance to reach the fueling facility executes the post injection the The filter member is configured to be regenerated.

Here, even if there is no fuel supply facility within the estimated travel distance range, there are cases where regeneration can be executed.

In other words, when the arrival distance is shorter than the travel distance and there is a fuel supply facility near the destination, the travel distance that can travel to the fuel supply 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 when it is determined that there is no fuel refueling facility within the range of the travel distance estimated by the fuel refueling facility determination unit, the reach distance travels by the first comparison unit. distance is determined shorter than, and when the rear above by Ri travel distance to the second comparing means is determined to longer than the distance obtained by adding the distance to reach the fueling facility, executing the post injection 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 travel distance estimating means is configured to estimate the travel distance as short as predicted that the regeneration efficiency is lowered based on the regeneration efficiency predicted by the regeneration efficiency predicting 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.

Also, the longer the predetermined time period to perform a post-degree predicted injected with easily reproduced, since that amount fuel consumption also increases, because the travel distance in correspondence to the increase in fuel consumption is also reduced estimated The estimation accuracy of the travel distance can be maintained.

According to the present invention, it is possible to suppress a decrease in the vehicle travel distance and a vehicle stop associated with the 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 airflow 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 for controlling 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 travel distance D is estimated based on the remaining fuel amount F detected by the fuel level sensor 29, the post-injection total consumption amount Fm, and the fuel consumption E. When the estimated travel distance D is equal to or less than a predetermined distance, 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, the differential pressure P is calculated based on each exhaust pressure read in step S11. Subsequently, in step S14, the particulate filter 12 captures the 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. estimating the travel distance D in the case.

In step S20, it is determined whether or not the travel 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 travel distance D is equal to or longer 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 travel 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 remaining fuel amount in the fuel tank is small and the travel 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 travel distance and a vehicle stop associated with the execution of regeneration 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 long, 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 travel distance D is also estimated to be short, so that the estimation accuracy of the travel 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 travel 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, the distance Da from the current position of the vehicle to the destination, the travel distance D estimated from the remaining fuel amount F, and the regeneration end point a that is 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: distance Da from the current position of the vehicle to the destination is longer than the travel distance D, and if the travel distance D refueling facility G to the running route in the interval does not exist, to prohibit playback.

Pattern 2: If the distance from the current position to the destination Da is longer than the travel distance D of the vehicle, and refueling facility G in the traveling path section of the travel distance D in the traveling direction from the playback end point a exists, reproduction Executed.

Pattern 3: Distance from the current position to the destination Da is longer than the traveling distance of the vehicle, and although the fuel filling stations G to the running route in the interval of travel distances D are present, running from the playback end point a direction of travel distance When there is no fuel supply facility G in the travel route section of D, regeneration is prohibited.

Pattern 4: If the distance from the current position to the destination Da is mileage shorter than D, and the travel distance D refueling facility G to the running route in the interval of the vehicle is present, reproduction is executed.

Pattern 5: distance from the current position to the destination Da is shorter than the travel distance D of the vehicle, the travel distance D is the shortest present around the destination from the distance Da and the destination from the current position to the destination of the vehicle When the distance is shorter than the sum of the distance Db to the fuel supply facility G, regeneration is prohibited.

Pattern 6: Distance from the current position to the destination Da is shorter than the travel distance D of the vehicle, the travel distance D is the shortest present around the destination from the distance Da and the destination from the current position to the destination of the vehicle 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 travel distance D calculated in step S39.

When it determines with YES by step S41, it progresses to step S42 and it is determined whether the fuel supply facility G exists in the travel route area of the travel distance D. FIG.

When it is determined NO at step S42, i.e., when the distance Da from the current position of the vehicle to the destination is longer than the travel distance D, and refueling facility G to the running route in the interval of travel distances D is absent, 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 refueling facility G is present in the travel path in a section of the travel distance D from the predicted regeneration completion time a in step S45.

When it is determined YES at the step S46, i.e., greater than the distance Da is the travel distance D from the current position of the vehicle to the destination, refueling facilities in the running path section of the travel distance D in the traveling direction from the playback end point a 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.

Further, when it is judged NO in step S46, i.e., greater than the distance Da is the travel distance D from the current position of the vehicle to a destination, although the refueling facility G is in the travel path in a section of the travel distance D, its refueling facility G in the front of the reproduction end point a, if there is no refueling facility G in the travel path section of the travel distance D from the playback end point a, since it is not possible to refueling after playing 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 it is determined YES at step S52, that is, shorter than the distance Da is the travel distance D from the current position of the vehicle to the destination, if there is a refueling facility G to the running route in the interval of travel distances D, reproduction 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 travel 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 it is determined NO at step S54, that is, shorter than the distance Da is the travel distance D from the current position of the vehicle to the destination, the travel distance D is the distance Da and the destination 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)
Further, when it is determined YES at the step S54, that is, shorter than the distance Da is the travel distance D from the current position of the vehicle to the destination, the travel distance D is 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, embodiments according to Embodiment 2, pattern 1 distance Da from the current position of the vehicle to the destination is longer than the travel distance D, and not the refueling facility G is present in the travel path in a section of the travel distance D In this case, since fuel refueling cannot be performed after the regeneration is completed, regeneration is prohibited, and it is possible to suppress a decrease in the travel distance of the vehicle and stop of the vehicle accompanying regeneration execution.

Also, longer than the distance Da is the travel distance D from the current position of the vehicle to the destination, if the case where the pattern 2 is present refueling facility G in the traveling path section of the travel distance D in the traveling direction from the reproduction end time 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.

Also, longer than the distance Da is the travel distance D from the current position of the vehicle to the destination, but the travel route in the interval of travel distance D refueling facility G is, than the fuel filling stations G reproduction end 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 travel distance D from the regeneration end time point a before the regeneration, since the fuel cannot be refueled after regeneration, the regeneration is prohibited and the regeneration is performed. A reduction in the travel distance of the accompanying vehicle and a vehicle stop can be suppressed.

Moreover, shorter than the distance Da is the travel distance D from the current position of the vehicle to the destination, in the case of the pattern 4 which exists refueling facilities G to the running route in the interval of travel distances D, the destination be performed reproduction Therefore, the regeneration is executed, and the particulate filter 12 can be regenerated early.

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

Moreover, shorter than the distance Da is the travel distance D from the current position of the vehicle to the destination, the travel distance D is, fuel shortest present in the vicinity of the destination from the distance Da and the destination from the current position to the destination of the vehicle 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 the predetermined period T in which the post-injection is executed so that it is predicted that the particulate filter 12 is difficult to regenerate, that is, the regeneration time is set longer, the 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 travel distance D is also estimated to be short, so that the estimation accuracy of the travel 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 travel distance D, and the distance Db from the destination to the shortest fuel supply facility G existing around the destination are calculated. Although the example in which the comparison or the prediction of the playback end point a is performed by the engine control control unit 50 has been shown, at least one or all of these processes may be performed by the navigation control control unit 60. .

  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. 5 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.

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, travel 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;
Travel distance estimation means for estimating a travel distance that can be traveled from the current position of the vehicle when the fuel injection control means performs regeneration of the filter member based on the remaining fuel amount detected by the remaining fuel amount detection means And
In that said fuel injection control means, when the running distance estimated by said running distance estimating means is less than the predetermined value, that is configured to restrict execution of the post injection to limit the reproduction of the filter member 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 engine exhaust gas purification apparatus according to claim 1, wherein the travel distance estimating means is configured to estimate the travel 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;
Travel distance estimation means for estimating a travel distance that can be traveled from the current position of the vehicle when the fuel injection control means performs regeneration of the filter member based on the remaining fuel amount detected by the remaining fuel amount detection means When,
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 determination means for determining whether or not there is a fuel refueling facility within the range of travel distance estimated by the travel distance estimation means when the exhaust particulate amount detected by the exhaust particulate amount detection 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 travel 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;
A first comparison means for comparing the arrival distance calculated by the travel distance and the travel distance calculating means which is estimated by the running distance estimator,
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 travel distance range estimated by the fuel refueling facility determination means, the first comparison means causes the reach distance to be greater than the travel distance. When it is determined that there is no fuel refueling facility in the travel route section of the travel 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;
A first comparison means for comparing the arrival distance calculated by the travel distance and the travel distance calculating means which is estimated by the running distance estimator,
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;
Comparing the running distance estimated by the travel distance estimating means, and a distance obtained by adding the distance to the fuel property calculated by arrival distance and the fuel property fueling distance calculation means calculated by the arrival distance calculation means A second comparing means,
Even if it is determined that there is no fuel refueling facility within the range of the travel distance estimated by the fuel refueling facility determination unit, the fuel injection control unit has an arrival distance that is greater than the travel distance by the first comparison unit. is determined also short, and when the running distance Ri by the said second comparison means is determined to longer than the distance obtained by adding the distance to reach the fueling facility executes the post injection the 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 travel distance estimating means is configured to estimate a travel 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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