JPH0327816U - - Google Patents

Description

[Brief explanation of drawings]

Figures 1 a and b are claims correspondence diagrams of the present invention, Figure 2
The figure is a block diagram showing the first embodiment of the present invention, Figure 3 is a flowchart of the same embodiment, Figures 4 and 5 are diagrams showing the contents of the map, and Figure 6 is the control characteristic line of the throttle valve. 7 is a block diagram showing a second embodiment of the present invention, FIG. 8 is a flowchart of the same embodiment, and FIG. 9 is a control characteristic diagram of the bypass valve. 1... Engine, 3... Exhaust passage, 4... Filter, 5... Throttle valve, 7... Temperature sensor, 8, 9...
Exhaust pressure sensor, 10...control unit, 11...rotation speed sensor, 13...engine load sensor, 21...bypass passage.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Adjustment of exhaust pressure according to the opening degree of a filter that collects particulate in the exhaust passage and a valve body inserted into the exhaust passage downstream of the filter. A throttle valve, an exhaust pressure detection means for detecting the exhaust pressure in the exhaust passage, an engine rotation speed detection means for detecting the engine rotation speed, an engine load detection means for detecting the engine load, and the exhaust temperature in the exhaust passage. an exhaust temperature detection means for detecting the engine speed; a determination means for determining filter regeneration based on a comparison between a prescribed pressure set according to the engine speed and the engine load and the exhaust pressure in the exhaust passage; An exhaust gas purification device for a diesel engine, comprising a throttle valve opening/closing control means for controlling the throttle valve to close when the exhaust gas temperature at the time when the determination means makes a regeneration determination is lower than a specified temperature, wherein the engine load is set at a predetermined level during filter regeneration. 1. An exhaust gas purification device for a diesel engine, comprising a throttle valve full-open control means that controls the throttle valve to be fully open when the exhaust gas temperature reaches a high load region, even when the exhaust temperature is lower than a specified temperature. (2) A filter that collects particulates in the exhaust passage, a throttle valve that adjusts the exhaust pressure according to the opening degree of a valve body inserted into the exhaust passage downstream of the filter, and a Exhaust pressure detection means for detecting exhaust pressure, engine rotation speed detection means for detecting engine rotation speed, engine load detection means for detecting engine load, and exhaust temperature detection means for detecting exhaust temperature in the exhaust passage. , a determining means for determining filter regeneration based on a comparison between a prescribed pressure set according to the engine speed and the load of the engine and exhaust pressure in the exhaust passage, and a regeneration determination being performed by the determining means. and a throttle valve opening/closing control means for controlling the throttle valve to close when the exhaust gas temperature is lower than a specified temperature, the exhaust gas purification device for a diesel engine comprising: a bypass passage that bypasses the filter and the throttle valve. Exhaust purification for a diesel engine, characterized in that it is equipped with bypass passage full-open control means for controlling communication of the bypass passage to be fully opened regardless of the exhaust temperature when the engine load reaches a predetermined high load range during filter regeneration. Device.