Effects of Inversed-delta Injection using TAIZAC with Discharge Valve on Diesel Engine Performance

Our research team has been pursuing the development of the TAIZAC (TAndem Injectors Zapping ACtivation) injector, aiming to implement inversed-delta injection rate shaping more easily for improving thermal efficiency by concurrently mitigating late combustion and reducing cooling losses. In this study, we introduced a redesigned TAIZAC injector incorporating a discharge valve. This modification not only facilitates a more aggressive inversed-delta injection but also streamlines the structure compared to the conventional TAIZAC configuration that relies on three separate injectors, including a discharge injector. Additionally, it improves both the flexibility of hardware integration and the adaptability of injection rate shaping. At a common rail pressure of 130 MPa, the enhanced inversed-delta injection using the newly developed TAIZAC achieved a 1.2-point gain in indicated thermal efficiency, along with a significant reduction in cooling losses, when compared with the 3-injector TAIZAC implementation.