HMC is strengthening engine technologies aimed at reducing gas emissions. The diesel engines of passenger cars have become equipped with the Catalyzed Particulate Filter (CPF). These engines feature an exhaust gas purifying level of over 90%. The filter helps cut exhaust emissions dramatically. In the case of the small and middle size I-4 gamma engine, which has a variety of environment-friendly qualities, the Warm-up Catalytic Converter + Under-floor Catalytic Converter (WCC+UCC) is placed at the back of the vehicle to shorten the catalyst activation time, thereby improving catalyst purifying efficiency.

We reduced gas emissions and improved fuel efficiency by employing the offset crankshaft to reduce friction of the piston and aluminum cylinder blocks to bring down the weight of the engine. To improve gas emissions from mid- to large-sized commercial vehicles, we developed three commercial diesel engines. The 3.9L F engine and 5.9L G engine employ the third generation common rail system with high injection pressures of 1,800 bar, thereby satisfying the gas emission regulations of the Euro-IV and achieving high performance and low fuel consumption.