US 7,607,292 B2 · Fuel addition apparatus

Abstract

In a transient state, where the temperature at the distal end of a fuel adding valve enters a high temperature region, an addition amount for preventing clogging is not simply added in accordance with a map, but instead, delay in the rise of the temperature of the fuel adding valve in the transient state is taken into consideration, and the addition amount for preventing clogging is calculated on the basis of the elapsed time after the point in time when the temperature at the distal end of the fuel adding valve enters the distal end high temperature region and the drive state of the engine (for example, the number of rotations of the engine), and thus, addition is carried out (steps ST4 to ST6). Such addition control makes it possible to add an appropriate fuel addition amount for the rise in temperature of the fuel adding valve in the transient state, and thus, wasteful fuel addition is reduced.

Claims6

Dependent claims

A fuel addition apparatus for adding fuel into an exhaust passage of an internal combustion engine, the fuel addition apparatus comprising:

a fuel adding valve for adding fuel into the exhaust passage of the internal combustion engine having a nozzle and nozzle hole exposed to the interior of the exhaust passage;
a crank position sensor for determining whether the fuel adding valve itself has entered a high temperature region on the basis of number of rotations of the engine and the amount of fuel injected into the engine;
an addition amount calculating section which calculates a fuel addition amount on the basis of the elapsed time after the point in time when the temperature of said fuel adding valve itself enters the high temperature region and based on the number of rotations of the engine;
and
an addition controlling section which controls addition of fuel on the basis of said calculated fuel addition amount and said elapsed time to prevent wasteful fuel addition,
wherein clogging of the nozzle hole due to calking of substances such as soot and SOF deposited thereon, or adhered thereto, is limited or prevented.

3 more elements

Dependencies are inferred from the claim text.

Fuel addition apparatus

Life of this patent

Fuel addition apparatus

Life of this patent

Abstract

Claims6