Hiroaki Ohhara

Exhaust gas purifying method

Exhaust emission purifying catalyst device

exhaust gas cleaning systems

Catalyst unit, for reducing emission levels, particularly of nitrogen oxides, in internal combustion engine vehicle exhaust gas has upstream region of high concentration of noble metal and downstream region of lower concentration

Purifying catalyst and engine

Abgasreinigungskatalysator Exhaust gas purifying catalyst

Abgasreinigungsverfahren Exhaust gas cleaning systems

Exhaust emission control device of an internal combustion engine

Exhaust gas emission control device for e.g. four-cylinder petrol engine, has variation controlling device that operates based on cycle and amplitude that are determined to increase oxygen and carbon mono-oxide concentrations

Abgasreinigungsvorrichtung für Verbrennungsmotoren