Electronic circuit arrangement for triggering solenoid valves

An apparatus for controlling solenoid valves in a fuel injection system for an internal combustion engine, comprising:

• a plurality of solenoid valves;
• a plurality of first transistors, each coupled in series to a respective solenoid valve;
• a plurality of first diodes, each being coupled on its input between a respective solenoid valve and a first transistor;
• a transistor coupled to the output of each first diode through a first collecting point and directly connected to each solenoid valve through a second collecting point and through a conducting element having no active components;
• a quench capacitor coupled to the output of each first diode and to the second transistor through the first collecting point and coupled to each of the first transistors through a third collecting point;
• a second diode coupled to the solenoid valves and to the second transistor through the second collecting point;
• and
• a resistor coupled to the capacitor and to the first transistors through the third collecting point.

An apparatus for controlling solenoid valves in a fuel injection system for an internal combustion engine comprising:

• a plurality of solenoid valves;
• a plurality of first transistors, each coupled in series to a respective solenoid valve;
• a plurality of first diodes, each being coupled by its input between a respective solenoid valve and a first transistor;
• a supplementary circuit coupled to the solenoid valves, first transistors and first diodes, including
• a second transistor coupled to the output of each of the first diodes through a first collecting point and coupled to each of the solenoid valves through a second collecting point;
• a capacitor coupled to the second transistor and to each of the first diodes and coupled to each of the first transistors;
• and
• a second diode coupled to each of the solenoid valves and to the second transistor through the second collecting point, the second diode coupling the second transistor to a voltage source.