Search Results

The conventional active noise control technology for engine booming noise1 based on the Filtered-Reference LMS algorithm 2,3 has a conflict in between the ability of tracking a change of engine rpm and simultaneously controlling the low frequency (low rpm) region. As a result, the conventional approach is difficult to apply for booming noise for a low rotation engine, an important region for weight reduction of a vehicle. Because of these reasons, there are few applications of the conventional approach to reduce booming noise. The purpose of this study is to propose a less complex ANC system based on a Single-frequency Adaptive Notch (SAN) 2,4 algorithm. The system proposed in this paper solves the problem of good control performance in the low rotation or rpm region, assures the stability related to a mass production, and reduces the number of component parts in a manufacturing process.

Mitsubishi Motors Corporation presents the newly-developed 2-liter engine, which we have named SIRIUS DASH. The SIRIUS DASH engine, with its compound intake system, features great performance in both high and low speed ranges while keeping fuel consumption low. The compound intake system operates the 3 valves in 2 stages. When engine speed is low, just one intake valve is used, but when engine speed increases, two intake valves are used. And to make this engine truly extraordinary, we added a turbocharger with an intercooler, and equipped the whole thing with a total electonic control system. Generally, high performance engines which have large inlet ports and high speed type valve timing enabling them to intake sufficient air for high performance at high speeds. The problem is here that when speed is dropped, combustion becomes unstable at the expense of torque and fuel consumption.