The increasing air pollution from internal combustion engines remains a critical environmental concern, primarily due to harmful emissions such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). Although catalytic converters are commonly used in petrol engines, their efficiency varies under different operating conditions. This paper presents the design and development of a modified AdGreen-based emission control system aimed at reducing multiple pollutants in petrol engines. The proposed system utilizes a specially formulated AdGreen solution consisting of urea (20%), hydrogen peroxide (5%), calcium hydroxide (10%), and distilled water (65%). The system is integrated into the exhaust line using a dual-pipe configuration, where controlled injection is achieved through an ESP32-based control unit, relay-driven pumps, and RPM-based actuation. Experimental analysis was carried out using a gas analyzer (PEA 205N) on a petrol engine. The results show a significant reduction in emissions, with carbon monoxide reduced to 0.003% and hydrocarbons reduced to 0 ppm. The system offers a low-cost, retrofit, and efficient solution for emission control, contributing to cleaner and greener automotive technologies.

The modified ADGreen-based emission control system presents an effective and economical solution for reducing pollutants in petrol engines. By integrating chemical injection with electronic control, the system achieves significant emission reduction. The experimental results validate the performance of the system, showing substantial improvements over conventional catalytic converters. The proposed system can be further developed for large-scale implementation, contributing to sustainable and eco-friendly transportation.

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