Abstract: The injector solenoid valve of a diesel common rail system determines the performance of multiinjections.
Time delays caused by the inputs /outputs or the network communications strongly influence the
responsibility and stability of automotive electronic control (EC) systems. This paper analyzes the energizing
and dis-energizing processes of a typical high speed actuator, and presents an equation to estimate the energy
release rate. A drive circuit with high voltage was designed, in which different freewheel circuits were disposed
in different drive stages. The results show that the driver circuit with high voltages obviously shortens the
energizing and release processes. The current response during the build-up and fall-down of the common-rail
system injector-valve were shorten to 100-300 μs from original 500-1 000 μs. Therefore, the circuit ensures the
real-time performance and flexibility of the control system.

Key words: automotive electronic control (AEC) systems, drive circuit for actuator, response delay, freewheel
circuit