JPH0517112U - Parti-cure rate trap filter playback device - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In an engine equipped with a particulate trap filter, intake and exhaust are throttled during regeneration of the filter to raise exhaust temperature and reduce engine noise when a heating device is not used. . [Structure] At the time of regeneration, at least one of the air supply throttle shutter 3 and the exhaust throttle shutter is throttled to increase the engine speed, at the same time delay the fuel injection timing, or perform exhaust gas recirculation, and the engine is increased by the amount of the exhaust gas temperature rise. The engine speed is reduced by reducing the rotation speed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a particulate trap filter regeneration device.

[0002]

[Prior Art]

 In a diesel engine, in order to remove and purify the particulates in the exhaust gas, a particulate trap filter is installed in the exhaust passage, and when the filter is clogged, the particulate matter is regenerated by a heating device installed upstream of the filter. It burns to regenerate the filter.

Regarding the regeneration of the filter, the applicant of the present application discloses in Japanese Patent Application No. 1-108912 that at the time of regeneration, at least one of the intake shutter and the exhaust shutter is closed to increase the engine load to raise the exhaust temperature and use the heating device. We are proposing a technology to regenerate the filter.

[0004]

[Problems to be solved by the device]

 In the above-mentioned proposed technology, specifically, for example, only particulate matter is collected when the vehicle is running, and when it is collected for a predetermined amount or for a predetermined time, the vehicle is temporarily stopped and the engine supply / exhaust is throttled to reduce the rotation speed. The temperature of the exhaust gas is raised by raising the temperature to around medium speed.

However, this technique has a problem that the engine noise is large.

An object of the present invention is to provide a particulate trap filter that reduces engine noise.

[0007]

[Means for Solving the Problems]

 According to the present invention, the particulate trap filter is provided in the exhaust passage of the engine, and the regeneration device is provided with means for increasing the engine speed by restricting intake air and exhaust gas at the time of regeneration of the filter. During the regeneration period, control means is provided to delay the fuel injection timing from that during normal operation.

Further, according to the present invention, in a regeneration device equipped with a particulate trap filter in an exhaust passage of an engine, and means for restricting intake and exhaust during regeneration of the filter to increase an engine speed, The regeneration device is provided with control means for performing exhaust gas recirculation during the regeneration period.

The control means is preferably composed of a controller formed by a microcomputer.

[0010]

[Action]

 In the particulate trap filter regeneration device configured as described above, during regeneration, the controller throttles the supply / exhaust gas to raise the engine speed, and at the same time delays the fuel injection timing from that during normal operation. The exhaust temperature rises by delaying this injection timing. Therefore, the engine speed can be reduced by the increase in the exhaust temperature, and the engine noise can be reduced accordingly.

Further, the controller performs the exhaust gas return at the same time as the supply and exhaust throttle and the engine speed increase. Due to this exhaust gas recirculation, the amount of gas exhausted from the engine, that is, the heat capacity, decreases, and the intake air temperature rises and the exhaust gas temperature rises. Therefore, similarly to the above, the engine noise is reduced.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an intake passage 2 of the engine 1 is provided with a normally open intake throttle shutter 3, and an exhaust passage 5 is provided with a trap 6, a normally full exhaust throttle shutter 7 and an exhaust passage 5 from the upstream side. The muffler 8 is inserted in series.

Both of these shutters 3 and 7 are connected to a trap reproduction controller 10 which is a control means. The controller 10 is connected to the regeneration start command switch 11, the engine rotation sensor 12, the engine load sensor 13, the timer 14 of the fuel injection pump 9, and the timer controller 16 to which the accelerator sensor 13 is connected. There is.

The trap regeneration controller 10 is composed of a microcomputer, and when the regeneration start command switch 11 is turned on as shown in FIG. 2, the accelerator actuator 15, for a predetermined time, that is, a regeneration time (for example, 10 minutes), The opening of each of the intake throttle shutter 3 and the exhaust throttle shutter 7 is opened to a specified opening, and an injection timing delay (crank angle, for example, 3 to 5 degrees) command signal is output to the timer controller 16. ..

Next, the operation will be described with reference to FIG.

When the regeneration start command switch 11 is turned on, the trap regeneration controller 10 outputs a control signal to the accelerator actuator 15, the intake throttle shutter 3, and the exhaust throttle shutter 7 to set their respective opening degrees to the prescribed opening degrees. At the same time as opening, the engine speed is raised from the idling speed to the specified speed (for example, 50% of the rated speed) (steps S1, S2, S3), and then the injection timing retard command signal is sent to the timer controller 16. It is output and the injection timing is delayed by, for example, 3 to 5 degrees in crank angle (step S4). Then, when a predetermined time (for example, 10 minutes) has elapsed (YES in step S5), the injection timing delay command signal to the timer controller 16 is turned OFF to return to the normal injection timing (step S6), and the exhaust throttle shutter 7, A control signal is output to the intake throttle shutter 3 and the accelerator actuator 15 to fully open them (steps S7, S8, S9), and the control ends. By delaying the injection timing in step S4, the exhaust gas temperature rises accordingly.

FIG. 4 shows an embodiment of another aspect of the present invention. In this embodiment, an EGR passage 4 that connects the intake passage 2 and the exhaust passage 5 is provided. The EGR passage 4 is provided with an orifice 4a and an EGR valve 17 is interposed. The EGR valve 17 is connected to the trap regeneration controller 10A, and other parts corresponding to FIG. 1 in FIG. 4 are denoted by the same reference numerals and duplicate description will be omitted.

In FIG. 5, when the regeneration start command switch 11 is turned on, the trap regeneration controller 10A outputs a control signal to the intake throttle shutter 3 and the exhaust throttle shutter 7 to set their respective opening degrees to the specified opening degrees. Open (steps S11, S12). Next, a control signal is output to the axel actuator 15, the engine speed is increased from the idling speed to a specified speed (for example, 50% of the rated speed) (step S13), and the control signal is output to the EGR valve 17. Then, the valve is opened and exhaust gas recirculation is performed (step S14). When a predetermined time (for example, 10 minutes) has elapsed (YES in step S15), a control signal is output to the EGR valve 17, the valve is closed to stop the exhaust gas recirculation (step S16), and the control signal is sent to the accelerator actuator 15. Is output to return to the idling speed (step S17), a control signal is output to the exhaust throttle shutter 7 and the intake throttle shutter 3, and each is fully opened (steps S18 and S19) to end the control. By performing exhaust gas recirculation in step S14, the amount of gas exhausted from the engine, that is, the heat capacity, is correspondingly reduced, and the intake temperature rises and the exhaust temperature rises.

[0020]

[Effect of the device]

 Since the present invention is configured as described above, at the time of regeneration, the injection timing is delayed or exhaust gas recirculation is performed to reduce the engine speed and the engine noise as much as the exhaust gas temperature rises. I can do it.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is an operation timing chart.

FIG. 3 is a control block diagram.

FIG. 4 is an overall structural view showing an embodiment of another aspect of the present invention.

FIG. 5 is a control flowchart diagram.

[Explanation of symbols]

 3 ... intake throttle shutter 4 ... EGR passage 5 ... exhaust passage 6 ... trap 7 ... exhaust throttle shutter 10, 10A ... trap regeneration controller 11 ... regeneration start command switch 14 ... ..Timer 15 ... Accelerator actuator 16 ... Timer controller 17 ... EGR valve

Claims (2)

[Scope of utility model registration request] 1. A regenerator equipped with a particulate trap filter in an exhaust passage of an engine, which restricts intake air and exhaust during regeneration of the filter to increase engine speed, wherein the regenerator has a regeneration period. A particulate trap filter regenerator characterized in that a control means for delaying the fuel injection timing from the normal operation is provided. 2. A regenerator equipped with a particulate trap filter in an exhaust passage of an engine, which restricts intake air and exhaust at the time of regenerating the filter to increase engine speed. A particulate trap filter regenerator characterized by being provided with a control means for performing exhaust gas recirculation.