Use of Taguchi Method to Optimize the Operating Parameters of a High-Pressure Injector Driving Circuit

Abstract

This paper develops a superior injector driving circuit for a 500c.c. motorcycle GDI engine. The POWER MOSFET component is introduced in the design of the three-pulse injector driving circuit. Experiments for the designed electric driving circuit are investigated to verify its feasibility. The experiments of the H.P. injector driving circuit are conducted for the fuel injection quantity of the H.P. injector under 80~100 bar fuel pressure, 1200~2000 μs injection pulse duration and DC 55~65V power supply voltage. PWM control is introduced to the last pulse 3A holding current for fast cut-off response time of the H.P. injector. Next, Taguchi method was used to lead the design of experiments (DOE). The fuel injection quantities were measured in the various control parameters as engine speeds, power supply voltages, injector driving currents, and fuel supply pressures by the designed injector driving circuit. Effect of these control parameters of the high-pressure (H.P.) injector driving circuit on the fuel injection quantity are analyzed in the paper. Taguchi orthogonal array optimizes the operating parameters of the H.P. fuel injecting system. Results show that the three-pulse POWER MOSFET injector driving circuit is capable of operating stably and assure the accurate injection quantity of the H.P. injector.

Optimization of Operating Parameters for Stable and High Operating Performance of a GDI Fuel Injector System

“…A major mutation compared with the first experiment was the insufficient fuel injection quantity in the experiment. The results in a previous paper showed that the needle of the high-pressure injector sometimes cannot continuously and effectively be held, resulting in insufficient injection quantity and engine misfire from many engine tests [21]. The novelty and contribution of this present draft is some improvements and discussions of this problem.…”

Power losses and dynamic response analysis of ultra-high speed solenoid injector within different driven strategies

“…Since drive strategy is crucial in precise control the solenoid injector, it is necessary to design a higher efficiency drive strategy to reduce the power losses and improve the dynamic response. The peak&hold circuit and magnetic flux bypass have been used to address this issue [1,2], however, there are no reports about how to evaluate the reasons. The power losses and dynamic response of the solenoid injector are determined by the drive strategies, the soft magnetic materials, the magnetic circuit structure, fuel pressure, preload spring and damping forces.…”

An Experimental Characterization for Injection Quantity of a High-pressure Injector in GDI Engines

“…The experiments of the HP injector driving circuit were conducted for the fuel injection quantity of the HP injector by controlling the fuel pressure and voltage across the solenoid coil, which further increased the response speed of the valve. Experimental results showed that the current drive circuit is feasible and reliable to implement for injection quantity of the HP injector [9]. The injector drive circuit was designed in a three-stage driving current with adjustable pulse width modulation (PWM) duties added to last pulse operation, and simulated by using PSpice software.…”