Method for the operation of an internal combustion engine with afterburner chamber and installation for carrying out the method

Claim 2

In a method for operating an internal combustion engine of the type having an afterburner combustion chamber arranged in the engine exhaust system downstream of exhaust valves associated with the main engine combustion chambers, said main engine combustion chambers being arranged between a relatively fixed cylinder head and cylinder block adjacent upper portions of cylinders of said cylinder block, said exhaust valves being movable to selectively close and open openings in a fixed part of said cylinder head; the improvement comprising: advancing the initial opening of the exhaust valves when the engine is in a middle rotational speed-or-load-range in response to a decrease in at least one of two control magnitudes consisting of engine rotational speed and engine load and advancing the initial opening of the exhaust valves in response to an increase in at least one of the two control magnitudes consisting of rotational speed and engine load.

Claim 3

A method according to claim 1, characterized in that the advance of the initial opening of the exhaust valves takes place in dependence on both control magnitudes.

Claim 4

A method according to claim 1, characterized in that the advance of the initial opening of the exhaust valves takes place in dependence on both control magnitudes.

Claim 5

A method according to claim 1, wherein the advance of the initial opening of the exhaust valves takes place in dependence on the engine rotational speed.

Claim 6

An installation for controlling the operation of a four-cycle internal combustion engine of the type having an afterburner combustion chamber in the engine exhaust system downstream of exhaust valves associated with the main engine combustion chambers, said main engine combustion chambers being arranged between a relatively fixed cylinder head and cylinder block adjacent upper portions of cylinders in said cylinder block, said exhaust valves being movable to selectively close and open openings in a fixed part of said cylinder block and head construction; said installation comprising: an exhaust system controlled by exhaust valve means, an afterburner chamber means arranged downstream of the exhaust valve means, valve adjusting means operatively connected with said exhaust valve means for adjusting the beginning of the opening of the exhaust valve means, and control means for actuating said adjusting means, said control means being operable from a middle speed and-load-range of the engine to advance the initial opening of the exhaust valve means in response to a decrease of at least one of the two control magnitudes consisting of engine load aNd engine rotational speed, wherein said control means is also operable, from a middle speed-or-load range of the engine, to advance the initial opening of the exhaust valve means with an increase in at least one of the two control magnitudes consisting of rotational speed and load of the engine.

Claim 7

An installation for controlling the operation of a four-cycle internal combustion engine of the type having an afterburner combustion chamber in the engine exhaust system downstream of exhaust valves associated with the main engine combustion chambers, said main engine combustion chambers being arranged between a relatively fixed cylinder head and cylinder block adjacent upper portions of cylinders in said cylinder block, said exhaust valves being movable to selectively close and open openings in a fixed part of said cylinder block and head construction; said installation comprising: an exhaust system controlled by exhaust valve means, an afterburner chamber means arranged downstream of the exhaust valve means, valve adjusting means operatively connected with said exhaust valve means for adjusting the beginning of the opening of the exhaust valve means, and control means for actuating said adjusting means, said control means being operable from a middle speed and-load-range of the engine to advance the initial opening of the exhaust valve means in response to a decrease of at least one of the two control magnitudes consisting of engine load aNd engine rotational speed, wherein said control means is also operable, from a middle speed-or-load range of the engine, to advance the initial opening of the exhaust valve means with an increase in at least one of the two control magnitudes consisting of rotational speed and load of the engine.

Claim 8

An apparatus according to claim 5, wherein the control means includes means for detecting the load of the internal combustion engine.

Claim 9

An installation according to claim 6, wherein said detecting means includes means for detecting the position of a throttle valve in a suction pipe of the engine.

Claim 10

An installation according to claim 6, wherein said detecting means includes means for detecting the position of a control rack in an injection pump of the engine.

Claim 11

An installation according to claim 6, wherein said control means includes centrifugal governor means for detecting the rotational speed of the engine.

Claim 12

An installation according to claim 5, wherein said control means is operable in dependence on both the load and rotational speed of the internal combustion engine.

Claim 13

An arrangement according to claim 5, wherein a diaphragm pump, operable in response to pulsating exhaust gas flow from said engine, is provided for pumping fresh air into said afterburner chamber.

Claim 14

An installation according to claim 11, wherein check valve means are provided upstream and downstream of said pump.

Claim 15

An installation for controlling the operation of a four-cycle internal combustion engine of the type having an afterburner combustion chamber in the engine exhaust system downstream of exhaust valves associated with the main engine combustion chambers, said main engine combustion chambers being arranged between a relatively fixed cylinder head and cylinder block adjacent upper portions of cylinders in said cylinder block, said exhaust valves being movable to selectively close and open openings in a fixed part of said cylinder block and head construction; said installation comprising: an exhaust system controlled by exhaust valve means, an afterburner chamber means arranged downstream of the exhaust valve means, valve adjusting means operatively connected with said exhaust valve means for adjusting the beginning of the opening of the exhaust valve means, and control means for actuating said adjusting means, said control means being operable from a middle speed and-load-range of the engine to advance the initial opening of the exhaust valve means in response to a decrease of at least one of the two control magnitudes consisting of engine load and engine rotational speed, wherein the control means is operable in dependence on the rotational speed of the internal combustion engine, wherein said control means comprises an adjusting mechanism operatively inserted between an exhaust valve controlling camshaft and an engine output shaft for varying the relative rate of rotation of said camshaft and output shaft in dependence on the speed of rotation of said output shaft, wherein said adjusting mechanism includes: a camshaft gear rotatably mounted on said camshaft, said gear being drivingly connected to said engine output shaft such that said gear rotates at a fixed relative speed with respect to the speed of said output shaft, a flange fixedly attached to said camshaft, and interconnecting means positioned between said flange and said gear for varying the relative position of said gear and said camshaft in dependence on the rotational speed of said gear, and wherein said interconnecting means includes axially extending pins fixed to said gear, adjusting segments fixed to said gear, setting segments on said flange, spring means between said setting and adjusting segments, and fly weights between said setting and adjusting segments, said fly weights being mounted for radial movement with respect to said gear axis for directly controlling the relative position of said setting and adjusting segments with respect to one another, said pins engaging said fly weights to limit their radial movement.

Claim 16

An installation for controlling the operation of a four-cycle internal combustion engine of the type having an afterburner combustion chamber in the engine exhaust system downstream of exhaust valves associated with the main engine combustion chambers, said main engine combustion chambers being arranged between a relatively fixed cylinder head and cylinder block adjacent upper portions of cylinders in said cylinder block, said exhaust valves being movable to selectively close and open openings in a fixed part of said cylinder block and head construction; said installation comprising: an exhaust system controlled by exhaust valve means, an afterburner chamber means arranged downstream of the exhaust valve means, valve adjusting means operatively connected with said exhaust valve means for adjusting the beginning of the opening of the exhaust valve means, and control means for actuating said adjusting means, said control means being operable from a middle speed and-load-range of the engine to advance the initial opening of the exhaust valve means in response to a decrease of at least one of the two control magnitudes consisting of engine load and engine rotational speed, wherein the control means is operable in dependence on the rotational speed of the internal combustion engine, wherein said control means comprises an adjusting mechanism operatively inserted between an exhaust valve controlling camshaft and an engine output shaft for varying the relative rate of rotation of said camshaft and output shaft in dependence on the speed of rotation of said output shaft, wherein said adjusting mechanism includes: a camshaft gear rotatably mounted on said camshaft, said gear being drivingly connected to said engine output shaft such that said gear rotates at a fixed relative speed with respect to the speed of said output shaft, a flange fixedly attached to said camshaft, and interconnecting means positioned between said flange and said gear for varying the relative position of said gear and said camshaft in dependence on the rotational speed of said gear, and wherein said interconnecting means includes axially extending pins fixed to said gear, adjusting segments fixed to said gear, setting segments on said flange, spring means between said setting and adjusting segments, and fly weights between said setting and adjusting segments, said fly weights being mounted for radial movement with respect to said gear axis for directly controlling the relative position of said setting and adjusting segments with respect to one another, said pins engaging said fly weights to limit their radial movement.

Claim 17

An arrangement according to claim 13, wherein, with a slowly moving gear, said spring means and pins are positioned such that an earlier initial opening of said exhaust valves is effected by said camshaft than is the case for normal middle range operation of the engine, whereby, with an increasing speed of the engine, the setting and adjusting segments are spread apart by the fly weights to cause later initial opening of said exhaust valves.