Motor brake for air-compressing internal combustion engines

Claim 1

A motor brake for an air-compressing internal combustion engine, comprising: a hydraulic linkage system disposed between a cam and an exhaust valve; an external regulating mechanism in the form of a high-speed solenoid valve that has a solenoid, with said linkage system communicating via a connecting line with said solenoid valve and a leakage oil compensation means of an engine lubricating-oil circuit; a control valve means that is disposed in an exhaust manifold of said engine and that upon actuation of said motor brake partially closes off said exhaust manifold together with activation of said solenoid valve; at least one sensor for activation of said solenoid valve; and a control unit, with signals of said at least one sensor, via the interposition of said control unit, being conveyed to said solenoid of said solenoid valve in such a way that, upon actuation of said motor brake during a specific time interval during lifting of a valve tappet of said linkage system via a secondary projection of said cam in a compression phase of said engine, said solenoid valve is closed, with said time interval being derived via a processing, in said control unit, of signals of said at least one sensor formed from a cam position and a camshaft speed, whereby said cam is divided into six sectors, with a first sector having a first angular range serving, via a primary projection of said cam, for the opening of said exhaust valve in an exhaust phase, a second sector having a second angular range serving for the filling of a cylinder space of said valve tappet, a third sector having a third angular range initiating closure of said solenoid valve, a fourth sector having a fourth angular range being provided with said secondary projection of said cam, a fifth sector having a fifth angular range serving for the reopening of said solenoid valve, and a sixth sector having a sixth angular range serving for the emptying of said cylinder space of said valve tappet.