JP6392658B2 - Diesel engine control device - Google Patents

Description

  The present invention relates to a control device for a diesel engine.

  Some general vehicles and industrial vehicles are equipped with a diesel engine as a power source. A vehicle equipped with a diesel engine is equipped with a particulate collection filter called DPF (Diesel Particulate Filter) for collecting particulate matter contained in the exhaust gas. It is trying not to discharge. However, there is a limit to the amount of particulate matter that can be collected by the particulate collection filter. Therefore, a process called automatic regeneration is programmed in advance in the control device mounted on the vehicle. In the automatic regeneration process, when it is determined that particulate matter equal to or more than the automatic regeneration determination amount has accumulated on the particulate collection filter, and when a predetermined condition is satisfied, the exhaust gas temperature is forcibly increased to collect the particulate matter. The particulate matter deposited on the filter is burned and incinerated in the particulate collection filter to regenerate the collection function of the particulate collection filter (to prevent clogging of the filter). When the automatic regeneration is executed, the temperature of the exhaust gas is raised and the particulate matter is burned and incinerated in the particulate collection filter, so that the temperature of the exhaust pipe including the particulate collection filter is several hundred [° C.]. Rise above. Further, in contrast to the above-described process called automatic playback that is automatically executed without the user's knowledge, a process called manual playback that is executed according to the user's intention is programmed in advance in the control means. In manual regeneration, in a vehicle parked in a safe place and in an idling state, when the user instructs execution of manual regeneration, the temperature of the exhaust gas is forcibly raised for a predetermined time, and particulate trapping is performed. The particulate matter accumulated in the collecting filter is burned and incinerated.

  For example, in Patent Document 1, a working machine equipped with a diesel engine is provided with a display device having a display screen and a display control device, and when the user gives a regeneration prohibition instruction from a regeneration prohibition switch, execution of the automatic regeneration is compulsory. Prohibited. On the display screen, the allowable accumulation amount set to an amount larger than the automatic regeneration determination amount and the estimated accumulation amount estimated to be accumulated on the particulate collection filter are displayed. Thus, by providing the regeneration prohibition switch, when working in an environment where there are combustibles in the surroundings, automatic regeneration is prevented from being executed without the user's knowledge. Also, by displaying the current amount of particulate matter and the allowable amount of deposit on the display screen, whether the work should be continued or moved from a manual regeneration switch to a safe place where there are no flammables around. By instructing regeneration, it is possible to appropriately determine whether to incinerate particulate matter called manual regeneration.

JP 2011-37334 A

  In the invention described in Patent Document 1, when the user turns on the regeneration prohibition switch, the temperature of the exhaust pipe including the particulate collection filter even if automatic regeneration is executed, for example, in the temperature environment surrounding the work machine. Even if the temperature does not rise to a temperature that affects surrounding combustibles, automatic regeneration is always prohibited. In this case, since the opportunity to perform manual regeneration increases, it is not preferable. If there is an opportunity to perform automatic regeneration safely, it is more preferable to perform automatic regeneration.

  The present invention was devised in view of the above points, and in a situation where automatic regeneration should be restricted, the opportunity to perform automatic regeneration safely can be used effectively and safely. It is an object of the present invention to provide a diesel engine control device capable of increasing the number of times of automatic regeneration.

  In order to solve the above-mentioned problems, a control device for a diesel engine according to the present invention takes the following means. A first aspect of the present invention is a control device for a diesel engine mounted on a vehicle, and the vehicle is included in an exhaust gas from the diesel engine provided in an exhaust path of the diesel engine. It is equipped with a particulate collection filter that collects particulate matter. When the control device determines that a predetermined amount or more of the particulate matter is deposited on the particulate collection filter, the control device forcibly increases the temperature of the exhaust gas when the predetermined condition is satisfied. Whether or not there is a special environment that may restrict the execution of the automatic regeneration means, and automatic regeneration means for regenerating the function of the particulate collection filter by burning and incinerating particulate matter deposited on the particulate collection filter Special environment determining means for determining whether or not the exhaust pipe temperature estimating means for estimating the temperature of the exhaust pipe including the particulate collection filter, and the special environment determining means determine that the environment is not a special environment, or the special environment When it is determined that the environment determination means is a special environment and the exhaust pipe temperature estimated by the exhaust pipe temperature estimation means is less than a predetermined exhaust pipe temperature, the automatic regeneration means The automatic regeneration when the special environment determination means determines that the environment is a special environment and the exhaust pipe temperature estimated by the exhaust pipe temperature estimation means is equal to or higher than the predetermined exhaust pipe temperature. And automatic regeneration permitting means for prohibiting execution of the means and interrupting execution of the automatic regeneration means when the automatic regeneration means is being executed.

  In the first aspect of the present invention, there is an opportunity (when the exhaust pipe temperature is lower than the predetermined exhaust pipe temperature) where the automatic regeneration can be performed safely in a situation where the automatic regeneration should be restricted (in a special environment). If there is, automatic reproduction can be appropriately performed, so that the number of times of automatic reproduction can be increased more safely.

  Next, a second invention of the present invention is a control apparatus for a diesel engine according to the first invention, wherein the exhaust gas temperature detecting means for detecting the temperature of the exhaust gas, and the outside air around the vehicle And an outside air temperature detecting means for detecting an outside air temperature, which is a temperature, and a running speed detecting means for detecting the running speed of the vehicle. Then, the control device detects the temperature of the exhaust gas detected using the exhaust gas temperature detection means, the outside air temperature detected using the outside air temperature detection means, and the travel detected using the travel speed detection means. Based on the speed, the temperature of the exhaust pipe including the particulate collection filter is estimated.

  In the second aspect of the invention, the temperature of the exhaust pipe including the particulate collection filter (the temperature of the surface of the exhaust pipe exposed to the outside air) can be estimated appropriately.

  Next, a third invention of the present invention is a control device for a diesel engine according to the second invention, wherein the control device is determined to be a special environment by the special environment determination means and When it is determined that the exhaust pipe temperature estimated by the exhaust pipe temperature estimating means is equal to or higher than the predetermined exhaust pipe temperature and the execution of the automatic regeneration means is interrupted, the execution of the automatic regeneration means is resumed after the interruption When the special environment determining means determines that the environment is a special environment and the exhaust pipe temperature estimated by the exhaust pipe temperature estimating means is less than the predetermined exhaust pipe temperature, and the detected traveling speed is equal to or higher than the predetermined speed. In some cases, the execution of the automatic regeneration means that has been suspended is resumed.

  In the third aspect of the present invention, there is an opportunity (exhaust pipe temperature is lower than a predetermined exhaust pipe temperature) where automatic regeneration can be performed safely in a situation where automatic regeneration should be restricted (in a special environment). If the execution of the automatic regeneration means is started after it is determined that there is, the execution of the automatic regeneration means can be resumed at an appropriate timing. For this reason, it is possible to appropriately avoid resuming and interrupting the automatic regeneration means in a short time (a phenomenon called so-called control hunting).

  Next, a fourth invention of the present invention is a control device for a diesel engine according to the third invention, wherein the control device is configured to perform the predetermined operation based on an outside air temperature detected using the outside air temperature detecting means. Find the speed.

  In the fourth aspect of the invention, after the execution of the automatic regeneration means is interrupted, the predetermined speed for allowing the automatic regeneration means to resume is changed according to the outside air temperature. Thereby, the restart of the automatic regeneration means after interruption can be executed at a more appropriate timing.

It is a figure explaining the schematic structure of the diesel engine control system containing the control apparatus of the diesel engine of this invention. It is a flowchart explaining the example of the process sequence of a control apparatus. It is a figure explaining the example of operation | movement of the automatic reproduction | regeneration based on the flowchart shown in FIG.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.
● [Diesel engine control system schematic configuration (Fig. 1)]
First, the configuration of a diesel engine control system including the diesel engine control device 25 of the present invention will be described in order with reference to FIG.

  The intake path 11 is a path of air taken in by the diesel engine 10, is connected to the intake manifold of the diesel engine 10, and is provided with intake air amount detection means 31. Then, the intake air amount detection means 31 outputs a detection signal corresponding to the flow rate of the air taken in by the diesel engine 10 to the control device 25.

  The diesel engine 10 is provided with an injector 35 for injecting fuel in each cylinder. The injector 35 supplies an appropriate amount of fuel to each cylinder at an appropriate timing based on the drive signal from the control device 25. The diesel engine 10 also includes a crank rotation detection means 34 (rotation sensor) that outputs a detection signal corresponding to the rotation of the crankshaft, and a cylinder detection means (a cylinder discrimination sensor) that outputs a detection signal indicating that a specific cylinder is in the compression process. There are various detection means (sensors) such as a cooling water temperature detection means (a water temperature sensor, not shown) that outputs a detection signal corresponding to the temperature of the coolant for cooling the engine. Description of these will be omitted.

  The exhaust path 12 is a path through which the exhaust gas of the diesel engine 10 flows, and is connected to the exhaust manifold of the diesel engine 10. The exhaust path 12 is provided with NOx detection means 32, fuel addition valve 21, exhaust gas temperature detection means 61A, 61B, 61C, oxidation catalyst 41, particulate collection filter 42, and the like.

  The NOx detection means 32 is a NOx sensor and outputs a detection signal corresponding to the amount of NOx in the exhaust gas to the control device 25.

  The fuel addition valve 21 is provided on the upstream side of the oxidation catalyst 41, and temporarily injects fuel when supporting activation of the oxidation catalyst 41 based on a drive signal from the control device 25. The fuel addition valve 21 may be omitted, and fuel injection (so-called post-injection) for supporting the activation of the oxidation catalyst 41 may be performed from the cylinder injector 35 at the timing of the exhaust process.

  The oxidation catalyst 41 is a catalyst that renders hydrocarbon (HC) and carbon monoxide (CO) harmless. The particulate collection filter 42 is a so-called DPF (Diesel Particulate Filter) that collects particulate matter in the exhaust gas.

  The exhaust gas temperature detection means 61 </ b> A, 61 </ b> B, 61 </ b> C is a temperature sensor that detects the temperature (gas temperature) of the exhaust gas, and outputs a detection signal to the control device 25. The exhaust gas temperature detection means 61A, 61B, 61C respectively include an exhaust gas inlet part of the oxidation catalyst 41, an exhaust gas outlet part of the oxidation catalyst 41, an exhaust gas inlet part of the particulate collection filter 42, and a particulate collection filter. 42 at the exhaust gas outlet. Note that the number and positions of the exhaust gas temperature detection means are not limited to the numbers and positions shown in the example of FIG.

  The control device 25 has a storage device such as a CPU and a memory. In addition to the detection signal from the intake air amount detection means 31, the detection signal from the NOx detection means 32, the detection signals from the exhaust gas temperature detection means 61A, 61B, and 61C, the control device 25 has a special signal. A signal from the environment switch 51, a special environment signal indicating whether or not the navigation device 51A is in a special environment, a signal from the manual regeneration switch 57, a detection signal from the outside air temperature detection means 37, a detection signal from the traveling speed detection means 38 Various signals and detection signals such as a detection signal, a detection signal from the accelerator pedal depression amount detection means 33, a detection signal from the crank rotation detection means 34, and the like are input. In addition, the input to the control apparatus 25 is not limited to these. In addition to the drive signal to the injector 35 and the drive signal to the fuel addition valve 21, the control device 25 includes a control signal to the special environment display means 52, a control signal to the manual regeneration prompting display means 55, Etc., various drive signals and control signals are output. In addition, the output from the control apparatus 25 is not limited to these.

  The special environment display means 52 is, for example, a display lamp. When the special environment switch 51 is operated to the side of the special environment by an operation from the occupant, or the area in the map where the navigation device 51A is currently traveling When a special environment signal indicating that it is a special environment is input when it is determined that the vehicle is in a special environment, it is lit at etc. to inform the user that the vehicle is currently traveling in the special environment To do. The special environment switch 51 is operated by the user himself / herself when traveling in a special environment. The special environment indicates a special environment that may restrict the execution of automatic regeneration, and the place where the vehicle is traveling is not on a paved road, but around a vehicle such as grassland or farmland. It is an environment where flammables such as hay exist.

  The manual regeneration prompting display means 55 is a display lamp, for example, and is turned on from the control device 25 when it is determined that particulate matter larger than the deposition amount to be subjected to manual regeneration processing is accumulated on the particulate collection filter 42. Is done. When the user confirms that the manual regeneration prompting display means 55 is turned on, the user stops the vehicle in a safe place where there is no flammable material and then operates the manual regeneration switch 57 to deposit on the particulate collection filter 42. The function of the particulate collection filter 42 can be regenerated by burning and burning the particulate matter.

  The outside air temperature detection means 37 is a temperature sensor that detects the temperature of the outside air around the vehicle, and outputs a detection signal to the control device 25.

  The travel speed detection means 38 is a speed detection sensor that detects the speed of the vehicle, and outputs a detection signal corresponding to the travel speed of the vehicle to the control device 25.

  The accelerator pedal depression amount detection means 33 is an angle detection sensor that detects the depression amount of the accelerator pedal by the user, and outputs a detection signal corresponding to the depression amount of the accelerator pedal to the control device 25.

[Processing procedure of control device 25 (FIG. 2)]
Next, the processing of the control device 25 will be described using the flowchart shown in FIG. The control device 25 executes the automatic reproduction when it is determined that the automatic reproduction can be safely performed even in the special environment.

  The control device 25 starts the processing shown in FIG. 2 at a predetermined timing such as a predetermined time interval (for example, every 100 [ms]), and proceeds to step S10.

  In step S10, the control device determines whether or not an automatic regeneration execution condition is satisfied. If it is determined that the execution condition is satisfied (Yes), the process proceeds to step S15, and if it is determined that it is not satisfied ( No) goes to step S45A. For example, the control device automatically determines that a predetermined amount or more of a particulate matter is deposited on the particulate collection filter and if a predetermined condition such as the vehicle is in steady running rather than being accelerated or decelerated is satisfied. It is determined that the playback execution condition is satisfied.

  When the process proceeds to step S45A, the control device stops automatic regeneration and proceeds to step S55A. For example, in the process of stopping automatic regeneration, when injection of fuel from a fuel addition valve or post injection from an injector of a cylinder in an exhaust process is performed, the injection is stopped and forcibly raised. The exhaust gas temperature is returned to the temperature of the exhaust gas before the automatic regeneration is executed. In step S55A, the control device sets an interruption flag (for automatic regeneration) to OFF and proceeds to step S60A. In step S60A, the control device sets the automatic regeneration execution flag to OFF and ends the process.

  When it progresses to step S15, a control apparatus determines whether it is a special environment, and when it is a special environment (Yes), it progresses to step S20, and when it is not a special environment (No), it progresses to step S45C. For example, when the special environment switch 51 shown in FIG. 1 is provided, when the special environment switch 51 is operated in the ON state, it is determined that the environment is a special environment, and the special environment switch 51 is operated in the OFF state. Is determined not to be a special environment. Note that the program that causes the control device to execute the process of step S15 corresponds to a special environment determination unit that determines whether or not the program is a special environment that may restrict the execution of the automatic reproduction unit.

  When the process proceeds to step S45C, the control device executes automatic regeneration and proceeds to step S50C. For example, the process of executing automatic regeneration is (when it is determined that a predetermined amount or more of particulate matter has been deposited on the particulate collection filter and the predetermined condition is satisfied (already determined under the automatic regeneration execution condition) ) Injecting fuel from the fuel addition valve or post-injecting from the injector of the cylinder in the exhaust process, etc., forcibly raises the temperature of the exhaust gas and burns and incinerates the particulate matter deposited on the particulate collection filter And regenerating the function of the particulate collection filter. A program that causes the control device to execute the automatic reproduction processing corresponds to automatic reproduction means.

  In step S50C, the control device determines whether or not the automatic regeneration completion condition is satisfied. If the completion condition is satisfied (Yes), the process proceeds to step S55C, and the completion condition is not satisfied ( No) goes to step S60D.

  When the process proceeds to step S55C, the control device sets the interruption flag (for automatic regeneration) to OFF and proceeds to step S60C. In step S60C, the control device sets the automatic regeneration execution flag to OFF and ends the process. When the process proceeds to step S60D, the control device sets the automatic regeneration execution flag to ON and ends the process.

  Further, when the process proceeds to step S20, the control device determines whether or not the (automatic regeneration) interruption flag is set to ON, and when it is set to ON (Yes), the control apparatus proceeds to step S25 and turns on. If it is not set (No), the process proceeds to step S35. Note that the interruption flag (for automatic reproduction) is set to OFF or ON in steps S55A, S55B, and S55C as shown in FIG.

  When the process proceeds to step S25, the control device detects the outside air temperature based on the detection signal from the outside air temperature detecting means, obtains the restart vehicle speed (corresponding to a predetermined speed) according to the detected outside air temperature, and proceeds to step S30. . For example, a map of restart vehicle speed corresponding to the outside air temperature is stored in advance in the storage device, and the restart vehicle speed is obtained from the map and the outside air temperature. For example, the restart vehicle speed is set to a lower value as the outside air temperature is lower.

  In step S30, the control device detects the vehicle speed (vehicle traveling speed) based on the detection signal from the traveling speed detecting means, and determines whether or not the detected vehicle speed is equal to or higher than the restart vehicle speed obtained in step S25. judge. The control device proceeds to step S35 when the vehicle speed is equal to or higher than the restart vehicle speed (Yes), and proceeds to step S45B when the vehicle speed is less than the restart vehicle speed (No).

  When the process proceeds to step S35, the control device detects the exhaust gas temperature detected based on the detection signal from the exhaust gas temperature detection means, the outside air temperature detected based on the detection signal from the outside air temperature detection means, and the traveling speed detection. Based on the vehicle speed detected based on the detection signal from the means, the temperature of the exhaust pipe including the particulate collection filter (the temperature of the surface of the exhaust pipe exposed to the outside air) is estimated, and the process proceeds to step S40. For example, the exhaust pipe temperature is estimated by subtracting the amount of heat released from the outside air temperature and the vehicle speed from the exhaust gas temperature. The program for causing the control device to execute the process of step S35 corresponds to exhaust pipe temperature estimating means for estimating the temperature of the exhaust pipe including the particulate collection filter.

  In step S40, the control device determines whether or not the estimated exhaust pipe temperature is lower than a predetermined temperature (corresponding to a predetermined exhaust pipe temperature), and if the estimated exhaust pipe temperature is lower than the predetermined temperature (Yes). The process proceeds to step S45C, and if the estimated exhaust pipe temperature is equal to or higher than the predetermined temperature (No), the process proceeds to step S45B. The predetermined temperature is set to, for example, about 300 [° C.], which is a temperature at which hay is ignited, but is not limited to 300 [° C.], and is appropriately set according to the environment. The processing after step S45C is as described above.

  When the process proceeds to step S45B, the control device stops the automatic regeneration and proceeds to step S50B. Note that the process of stopping the automatic reproduction is as described in the process of step S45A.

  In step S50B, the control device determines whether or not the automatic regeneration execution flag is set to ON. If it is set to ON (Yes), the process proceeds to step S55B, and if it is not set to ON (No) ) Terminates the process. As shown in FIG. 2, the automatic regeneration execution flag is set to OFF or ON in steps S60A, S60B, S60C, and S60D.

  When the process proceeds to step S55B, the control device sets an interruption flag (for automatic regeneration) to ON, and the process proceeds to step S60B. In step S60B, the control device sets the automatic regeneration execution flag to OFF and ends the process.

  When the program for causing the control device to execute the processing shown in FIG. 2 determines that the special environment determining means determines that the environment is not a special environment, or when the special environment determining means determines that the environment is a special environment, and the exhaust pipe temperature estimation When the exhaust pipe temperature estimated by the means is lower than the predetermined exhaust pipe temperature, the execution of the automatic regeneration means is permitted, and when the special environment judging means judges that the environment is a special environment and the exhaust pipe temperature estimating means If the exhaust pipe temperature estimated in the above is equal to or higher than the predetermined exhaust pipe temperature, the automatic regeneration means is prohibited and the automatic regeneration means is suspended when the automatic regeneration means is being executed. Equivalent to.

● [Example of automatic playback operation (Fig. 3)]
An example of the automatic regeneration operation by the processing of the control device described with reference to the flowchart of FIG. 2 will be described with reference to FIG. In FIG. 3, the horizontal axis is set to time.

  In the period from (start) to time t3, it is determined that the environment is not a special environment. In this non-special environment period, the automatic regeneration execution condition is satisfied from the time when it is not satisfied at time t1, and the process flows to steps S10, S15, and S45C shown in FIG. 2, and automatic regeneration is executed. In step S50C, the automatic regeneration execution flag is set to ON and automatic regeneration is performed until the automatic regeneration completion condition is satisfied (until time t2). At time t2, the automatic regeneration completion condition (combustion incineration of the fine particles accumulated in the fine particle repair filter) is established, and the process flows to steps S10, S15, S45C, S50C, and S55C shown in FIG. This shows a state in which the automatic reproduction execution condition is not satisfied in the process (not shown) due to the normal completion of the reproduction.

  In the period from time t3 to time t10, it is determined that the environment is a special environment. For example, in the invention described in Japanese Patent Application Laid-Open No. 2011-37334, when a regeneration prohibiting switch (corresponding to a special environment switch) is turned on, automatic regeneration is unconditionally prohibited. However, in the present application, even in a special environment, when the estimated temperature of the exhaust pipe (the temperature of the surface of the exhaust pipe exposed to the outside air) is lower than a predetermined temperature (for example, the ignition temperature of hay, etc.) Automatic playback is executed. In the example of FIG. 3, after it is determined that the environment is a special environment at time t3, the automatic regeneration execution condition is satisfied from the time when it is not satisfied at time t4, and steps S10, S15, S20, S35, S40, and S45C shown in FIG. The process has started and execution of automatic playback has started. However, at time t5, it is determined that the (estimated) temperature of the exhaust pipe has become equal to or higher than the predetermined temperature, and the process proceeds to steps S10, S15, S20, S35, S40, and S45B shown in FIG. Has been. At time t5, since the automatic reproduction that has been performed is stopped (suspended), the process flows to steps S10, S15, S20, S35, S40, S45B, S50B, and S55B shown in FIG. 2, and the suspension flag is turned ON. Is set.

  When the interruption flag is set to ON at time t5, the process proceeds to steps S10, S15, S20, S25, and S30 shown in FIG. 2, and automatic regeneration may be resumed until the vehicle speed becomes equal to or higher than the restart vehicle speed. Disappear. Thereby, it is possible to avoid repeating execution and interruption of automatic regeneration in a short period of time (a phenomenon called so-called control hunting).

  When the vehicle speed is equal to or higher than the restart vehicle speed at time t6 and the estimated exhaust pipe temperature is lower than the predetermined temperature, the process proceeds to steps S10, S15, S20, S25, S30, S35, S40, and S45C shown in FIG. (That is, if the restart vehicle speed is equal to or higher than the restart vehicle speed in automatic regeneration, the exhaust pipe temperature is set to a value lower than the predetermined temperature), and automatic regeneration is resumed. At time t7, since the vehicle speed is less than the restart vehicle speed, the process flows to steps S10, S15, S20, S25, S30, and S45B shown in FIG. 2, and automatic regeneration is interrupted again.

  At time t8, when the vehicle speed becomes equal to or higher than the restart vehicle speed and the estimated exhaust pipe temperature is lower than the predetermined temperature, the process proceeds to steps S10, S15, S20, S25, S30, S35, S40, and S45C shown in FIG. The process flows and automatic playback resumes. Then, automatic regeneration is executed during the period from time t8 to time t9, and automatic regeneration completion conditions (combustion incineration of particulates deposited in the particulate repair filter is completed) are established at time t9, and steps S50C, S55C, Processing flows to S60C.

  As described above, the control device (of the diesel engine) described in the present embodiment can perform automatic regeneration safely under a situation where it is determined that the environment is a special environment and automatic regeneration should be restricted. It is possible to effectively use the case where the temperature of the exhaust pipe (the temperature of the surface of the exhaust pipe exposed to the outside air), which is an opportunity, is lower than a predetermined temperature, and to increase the number of times of automatic regeneration safely. This can reduce the frequency of manual regeneration, which is laborious and time consuming, and is thus very preferable.

  The diesel engine control device 25 of the present invention is not limited to the configuration, structure, operation, processing procedure, and the like described in the present embodiment, and various modifications, additions, and deletions can be made without changing the gist of the present invention. Is possible.

  Further, the above (≧), the following (≦), the greater (>), the less (<), etc. may or may not include an equal sign. The numerical values used in the description of the present embodiment are examples, and are not limited to these numerical values.

  In the diesel engine control system shown in FIG. 1, the example in which the oxidation catalyst and the particulate collection filter are separately configured has been described. However, a catalyst (particulate collection) in which various catalysts and the particulate collection filter are integrated. Filter) may be used.

DESCRIPTION OF SYMBOLS 10 Diesel engine 11 Intake path 12 Exhaust path 21 Fuel addition valve 25 Control apparatus 31 Intake air amount detection means 32 NOx detection means 33 Accelerator pedal depression amount detection means 34 Crank rotation detection means 35 Injector 37 Outside air temperature detection means 38 Travel speed detection means 41 Oxidation catalyst 42 Particulate collection filter 51 Special environment switch 51A Navigation device 52 Special environment display means 55 Manual regeneration prompting display means 57 Manual regeneration switch 61A-61C Exhaust gas temperature detection means

Claims (4)

A control device for a diesel engine mounted on a vehicle,
The vehicle is equipped with a particulate collection filter that is provided in an exhaust path of the diesel engine and collects particulate matter contained in exhaust gas from the diesel engine,
Exhaust gas temperature detecting means for detecting the temperature of the exhaust gas;
An outside air temperature detecting means for detecting an outside air temperature which is a temperature of the outside air around the vehicle;
Travel speed detecting means for detecting the travel speed of the vehicle,
The control device includes:
When it is determined that a predetermined amount or more of particulate matter has been deposited on the particulate collection filter, the exhaust gas temperature is forcibly increased to deposit on the particulate collection filter when a predetermined condition is satisfied. Automatic regeneration means for regenerating the function of the particulate collection filter by burning and incinerating the particulate matter thus obtained;
Special environment determination means for determining whether or not the environment is a special environment that may restrict execution of the automatic regeneration means;
Exhaust pipe temperature estimating means for estimating the temperature of the exhaust pipe including the particulate collection filter;
The exhaust pipe temperature estimated by the exhaust pipe temperature estimation means when the special environment judgment means judges that it is not a special environment, or when the special environment judgment means judges that it is a special environment, and the exhaust pipe temperature estimated by the exhaust pipe temperature estimation means When the temperature is lower than the temperature, the execution of the automatic regeneration means is permitted, and the exhaust pipe temperature estimated by the exhaust pipe temperature estimation means when the special environment judgment means judges that the environment is a special environment is Automatic regeneration permitting means for prohibiting execution of the automatic regeneration means when the exhaust pipe temperature is higher than the exhaust pipe temperature and interrupting execution of the automatic regeneration means when the automatic regeneration means is being executed. And
Based on the temperature of the exhaust gas detected using the exhaust gas temperature detection means, the outside air temperature detected using the outside air temperature detection means, and the running speed detected using the running speed detection means, Estimating the temperature of the exhaust pipe containing the particulate collection filter,
When the special environment determining means determines that the environment is a special environment and the exhaust pipe temperature estimated by the exhaust pipe temperature estimating means is determined to be equal to or higher than the predetermined exhaust pipe temperature, the execution of the automatic regeneration means is interrupted. In this case, when the execution of the automatic regeneration means is resumed after the interruption, the exhaust pipe temperature estimated by the exhaust pipe temperature estimation means when the special environment determination means determines that the special environment is determined and the exhaust pipe temperature estimation means When the temperature is lower than the exhaust pipe temperature and the detected traveling speed is equal to or higher than a predetermined speed, the execution of the automatic regeneration means that has been suspended is resumed.
Diesel engine control device. A control device for a diesel engine mounted on a vehicle,
The vehicle is equipped with a particulate collection filter that is provided in an exhaust path of the diesel engine and collects particulate matter contained in exhaust gas from the diesel engine,
A travel speed detecting means for detecting the travel speed of the vehicle;
The control device includes:
When it is determined that a predetermined amount or more of particulate matter has been deposited on the particulate collection filter, the exhaust gas temperature is forcibly increased to deposit on the particulate collection filter when a predetermined condition is satisfied. Automatic regeneration means for regenerating the function of the particulate collection filter by burning and incinerating the particulate matter thus obtained;
Special environment determination means for determining whether or not the environment is a special environment that may restrict execution of the automatic regeneration means;
Exhaust pipe temperature estimating means for estimating the temperature of the exhaust pipe including the particulate collection filter;
The exhaust pipe temperature estimated by the exhaust pipe temperature estimation means when the special environment judgment means judges that it is not a special environment, or when the special environment judgment means judges that it is a special environment, and the exhaust pipe temperature estimated by the exhaust pipe temperature estimation means When the temperature is lower than the temperature, the execution of the automatic regeneration means is permitted, and the exhaust pipe temperature estimated by the exhaust pipe temperature estimation means when the special environment judgment means judges that the environment is a special environment is Automatic regeneration permitting means for prohibiting execution of the automatic regeneration means when the exhaust pipe temperature is higher than the exhaust pipe temperature and interrupting execution of the automatic regeneration means when the automatic regeneration means is being executed. And
When the special environment determining means determines that the environment is a special environment and the exhaust pipe temperature estimated by the exhaust pipe temperature estimating means is determined to be equal to or higher than the predetermined exhaust pipe temperature, the execution of the automatic regeneration means is interrupted. In this case, when the execution of the automatic regeneration means is resumed after the interruption, the exhaust pipe temperature estimated by the exhaust pipe temperature estimation means when the special environment determination means determines that the special environment is determined and the exhaust pipe temperature estimation means When the temperature is lower than the exhaust pipe temperature and the detected traveling speed is equal to or higher than a predetermined speed, the execution of the automatic regeneration means that has been suspended is resumed.
Diesel engine control device. A control device for a diesel engine according to claim 1 ,
The control device includes:
Obtaining the predetermined speed based on the outside air temperature detected using the outside air temperature detecting means;
Diesel engine control device. A control device for a diesel engine according to claim 2 ,
An outside air temperature detecting means for detecting an outside air temperature which is a temperature of outside air around the vehicle,
The control device includes:
Obtaining the predetermined speed based on the outside air temperature detected using the outside air temperature detecting means;
Diesel engine control device.