| 摘要 |
An IC engine has an exhaust gas-driven turbocharger with periodic admission of extra fuel and/or air upstream of the turbine for an additional boost. This additional boost is ignited catalytically by the electrical heating of a catalyst. This occurs during while the engine is still cold or during periods of acceleration. Catalytic firing ceases above a certain critical temperature. The catalyst heating is a function of engine load and catalyst temperature. A separate pipe by-passes the catalyst between exhaust manifold and turbine. This by-pass pipe has an electrically controlled check valve. This valve also controls a third pipe leading from the manifold directly to the main exhaust catalyst box, by-passing the turbine altogether. ADVANTAGE - Simple and robust turbocharger giving reduced harmful exhaust emissions during cold engine operation and acceleration. |
