The Performance of a Car with Various Engine Power Systems – Part II
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Summary
This study addresses the challenge of reducing exhaust emissions and improving fuel efficiency in older internal combustion engine vehicles, particularly in regions where fleet replacement is economically constrained. The research compares the performance of a standard carburetor fuel supply system against a modern electronic gasoline injection system (LH-Motronic) combined with a three-component catalytic converter. The primary motivation is to evaluate whether retrofitting older vehicles with injection technology can meet modern environmental standards, specifically Euro-2 norms, while enhancing operational efficiency. The experimental design involved comparative road, bench, and computational tests on a VAZ-21051 passenger car. Bench tests were conducted on a stationary loading stand (SGEU-55) to measure torque, air flow, and fuel consumption by weight. Exhaust gas analysis utilized chemiluminescent and other gas analyzers to determine concentrations of CO, hydrocarbons (HC), NOx, and CO2. Road tests simulated the European Urban Ride Cycle and included steady-state driving and acceleration dynamics. Computational models were also employed to estimate fuel consumption and emissions based on the experimental data. The results demonstrate significant improvements with the injection system. In urban driving conditions, the injection system reduced average fuel consumption by 7.3% compared to the carburetor. During acceleration to 90 km/h, the injection system reduced acceleration time by 4.81% and fuel consumption by 7.75%. However, at constant speeds, fuel consumption remained comparable between the two systems. Bench tests indicated that the injection system reduced idle fuel consumption by 11.1% and increased engine power by 6.6% under full load. Crucially, the injection system enabled the vehicle to comply with Euro-2 emission standards, with specific emissions of CO, HC, and NOx well below regulatory limits. The total emissions reduced to the level of CO aggressiveness decreased by 3.5 times, confirming the superior efficiency of the catalytic neutralization system when paired with electronic injection. The significance of this work lies in providing empirical evidence that retrofitting older vehicles with electronic injection systems and catalytic converters is a viable strategy for reducing environmental impact and improving fuel economy. This approach offers a practical solution for countries with aging vehicle fleets, allowing them to meet stricter environmental regulations without the immediate economic burden of complete fleet replacement. The study confirms that electronic feedback systems provide better control over the air-fuel mixture, leading to more effective exhaust gas cleaning and lower socio-economic damage from pollution.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | OpenAlex-citations | — | — | 1 | 2026-06-18 |
| archive | success | unpaywall | — | — | 2 | 2026-06-25 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-19 |
| chunk | success | chunk | — | — | 1 | 2026-06-19 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-19 |
| promote | success | — | — | — | 1 | 2026-06-18 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-19 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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