Abstract: The diagnostic method for a Diesel engine for determining whether this engine, or at least one device connected thereto, is affected by one or several malfunctions negatively influencing the degree of pollution of the exhaust gases produced by this engine, comprises the steps of analyzing the level of an exhaust gas or the evolution of this level, alone or together with the level or evolution of the level of another gas, according to a predetermined state of the engine and characterizing, from said analysis, any malfunction (s) affecting the Diesel engine and/or the devices associated with it. The invention also concerns a device for implementing this method and a computer program executable on the device.

Abstract: An electromagnetic and/or electric interference suppression device that reduces the severity of electromagnetic and/or electric interference of an asymmetric system. The suppression device utilizes an antenna to develop a voltage that is ideally equal to the interference voltage developed from interference signals. A tuned circuit having two opposing diodes, a capacitor, and an inductor mounted in series with each other, to create a voltage that approximates as closely as possible the interference voltage, neutralizing its effect on an asymmetric system.