| 摘要 |
<p>The electrical power circuit in accordance with the invention enables to control, in a fast, safe and reliable manner, the flame glow plug located in the intake manifold and the magnetic valve in a diesel engine cold start system, the said diesel engine cold start system being composed of a battery and an alternator for generating electric energy, a controller, an engine computer, a flame glow plug, an electromagnetic valve, interconnecting cables, and ducts for supplying fuel under pressure. The said circuit comprises two transistors (Tr1, Tr2) with an intrinsic diode, connected in series, and two IPS switches (Sw1, Sw2), wherein the source terminals (S1, S2) of the transistors (Tr1, Tr2) are connected together, while the drain (D1) of the first transistor (Tr1) is connected to the supply voltage (Ubatt) of the battery or alternator, and the drain (D2) of the second transistor (Tr2) is used as the power point (P1) of the first switch (Sw1) for the flame glow plug (FGP) and of the second switch (Sw2) for the magnetic valve (MV), both gates (G1, G2) of the transistors (Tr1, Tr2) being connected together and coupled to the signal from the control electronics (CE). There may be zero, one, or more additional transistors connected in parallel to each of the transistors (Tr1, Tr2), while at the power point (Pl) there may be connected, in addition to the IPS switches for the flame glow plug (FGP) and the magnetic valve (MV), zero, one, or more additional IPS switches in parallel, or as additional switches for additional electrical loads. The circuit as a whole enables the electric current to be switched off in case the battery polarity is reversed and in case there is a failure of the IPS switches.</p> |
