Abstract: A method of initiating regeneration of a particulate filter for a diesel engine having a common rail injection system permitting, at each engine cycle and in each cylinder of the engine, a fuel injection strategy performing one or more of the following injections; a main injection; a first pre-injection preceding the main injection and performed at the compression stroke; a second pre-injection preceding the main injection and following the first pre-injection; a first post-injection following the main injection; and a second post-injection following the first post-injection and performed at the exhaust stroke; the second pre-injection and the first post-injection being performed close enough to the main injection to participate, together with the main injection, in the actual fuel combustion phase, and wherein the timing of one or more of the injections performed is varied with respect to the timing of the injections in particulate filter non-regenerating conditions.

Abstract: A method of initiating regeneration of a particulate filter for a diesel engine having a common rail injection system permitting, at each engine cycle and in each cylinder of the engine, a fuel injection strategy performing one or more of the following injections: a main injection; a first pre-injection preceding the main injection and performed at the compression stroke; a second pre-injection preceding the main injection and following the first pre-injection; a first post-injection following the main injection; and a second post-injection following the first post-injection and performed at the exhaust stroke; the second pre-injection and the first post-injection being performed close enough to the main injection to participate, together with the main injection, in the actual fuel combustion phase.

Abstract: An injection method applicable to engines featuring a Denox catalyst for reducing the nitric oxide content of exhaust gas. In addition to the main injection phase, the method presents a post-injection phase predominantly performed during the exhaust stroke of the engine, so that the diesel fuel injected does not contribute--or only to a very limited extent--towards combusion, but is supplied directly to the Denox catalyst to increase its efficiency. The method involves no alterations to the injection system, by virtue of post-injection being controlled and optimized by the central unit controlling injection as a whole.

Abstract: An automatic regeneration initiating method presenting, in addition to the main injection phase, an auxiliary post-injection phase, for injecting a given quantity of fuel directly into the cylinders during the expansion stroke when the temperature in the combustion chamber is still high enough for its combustion, so as to increase the temperature of the exhaust gas and initiate combustion of the filtered particulate. By appropriately regulating the amount of fuel injected and the timing of the post-injection phase, incomplete combustion products are formed for assisting combustion of the dry particulate and lowering its ignition temperature.

Abstract: The structure has a number of sleeves fitted about the conduits of a supply circuit supplying fuel to the injectors of an engine. Each sleeve is tubular, and has a bellows type main body, two opposite end portions, and an outlet fitting extending from one of the end portions. The sleeves are fitted to the conduits by fitting the end portions in fluidtight manner to fittings at opposite ends of the conduits. The outlet fitting of each sleeve is then connected to a catch header by a respective connecting line, which connects the inner cavity of the main body to the catch header to enable any fuel leakage from the conduits to flow into the catch header.