JPS63128220U - - Google Patents

Description

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing an embodiment of this invention, Figure 2
The figure is a catalyst temperature-aldehyde generation characteristic diagram showing the effect, and Figure 3 is a block diagram showing another example.
FIG. 4 is a flowchart showing an example of control operation, FIG. 5 is a diagram of exhaust temperature vs. rack position characteristics, FIG. 6 is a configuration diagram showing still another embodiment, and FIG. 7 is a catalyst temperature in a conventional device. - Aldehyde generation amount characteristic diagram. 1...Catalyst, 2...Burner, 3...Plug, 6
... Solenoid valve, 8 ... Plug switch, 9 ... Temperature comparator, 10 ... Thermocouple.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In an internal combustion engine in which a catalyst is interposed in the middle of an exhaust passage, an exhaust temperature raising means for raising the exhaust temperature upstream of the catalyst, a catalyst temperature detecting means for detecting the catalyst temperature, and the catalyst An exhaust purification device for an internal combustion engine, comprising a control means for operating the exhaust gas temperature raising means when the temperature is in a temperature range where aldehydes are likely to be generated. 2. The exhaust gas purification device for an internal combustion engine according to claim 1, wherein the exhaust temperature raising means is a burner that burns fuel. 3. The exhaust gas purification device for an internal combustion engine according to claim 1, wherein the exhaust gas temperature raising means is an injection charge increasing device for a fuel injection pump.