Transient Injection Quantity Control Strategy for Automotive Diesel Engine Start-Idle Based on Target Speed Variation Characteristics

Yingshu Liu, Degang Li (), Miao Yang, Hao Zhang, Liang Guo, Dawei Qu, Jianjiang Liu and Xuedong Lin
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Yingshu Liu: College of Automotive Engineering, Jilin University, Changchun 130025, China
Degang Li: College of Automotive Engineering, Jilin University, Changchun 130025, China
Miao Yang: College of Automotive Engineering, Jilin University, Changchun 130025, China
Hao Zhang: College of Automotive Engineering, Jilin University, Changchun 130025, China
Liang Guo: College of Automotive Engineering, Jilin University, Changchun 130025, China
Dawei Qu: College of Automotive Engineering, Jilin University, Changchun 130025, China
Jianjiang Liu: FAW Jiefang Commercial Vehicle Development Institute, Changchun 130011, China
Xuedong Lin: College of Automotive Engineering, Jilin University, Changchun 130025, China

Energies, 2025, vol. 18, issue 19, 1-19

Abstract: Active control of injection quantity during start-up idle optimizes automotive diesel engine starting performance, aligning with low-carbon goals. Conventional methods rely on a calibrated demand torque map adjusted by speed, temperature, and pressure variations, requiring extensive labor for calibration and limiting energy-saving and emission improvements. To address this problem, this paper proposes a transient injection quantity active control method for the start-up process based on the variation characteristics of target speed. Firstly, the target speed variation characteristics of the start-up process are optimized by setting different accelerations. Secondly, a transient injection quantity control strategy for the start-up process is proposed based on the target speed variation characteristics. Finally, the control strategy proposed in this paper was compared with the conventional starting injection quantity control method to verify its effectiveness. The results show that the start-up idle control strategy proposed in this paper reduces the cumulative fuel consumption of the start-up process by 25.9% compared to the conventional control method while maintaining an essentially unchanged start-up time. The emissions of hydrocarbon (HC), carbon monoxide (CO), and nitrogen oxides (NOx) exhibit peak reductions of 12.4%, 32.5%, and 62.9%, respectively, along with average concentration drops of 27.2%, 35.1%, and 41.0%. Speed overshoot decreases by 25%, and fluctuation time shortens by 23.6%. The results indicate that the proposed control method not only avoids complicated calibration work and saves labor and material resources but also effectively improves the starting performance, which is of great significance for the diversified development of automotive power sources.

Keywords: start-up to idle condition; transient injection quantity control strategy; target speed; RPM overshoot characteristic; active control of start-up performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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