Controller for internal-combustion engine with supercharger

Abstract

Abstract PURPOSE:To aim at simpification in control of a supercharged engine, by causing a lag angle compensation value to be kept within the limits of tolerance and avoiding the occurrence of knocking with supercharging pressure compensated by means of decompression, when the lag angle compensation value at ignition timing by knock signals exceeds said tolerance. CONSTITUTION:A compressor 32 belonging to an exhaust turbosupercharger 31 is interposed in the suction passage of an engine 30 while a turbine 33 in the supercharger 31 is as well interposed in the exhaust system of the engine 30; a supercharged engine is composed of these arrangements. And, a blowoff valve 35 is installed in the suction passage extending from the outlet port of the compressor 32 to a suction manifold 34 of the engine 30 whereby a sudden rise in supercharging pressure attending on the sudden closure of a throttle valve 36 installed at the downstream of the blowoff valve 35 is prevented, thus avoiding the occurrence of surging in the compressor 32. On the other hand, in an exhaust passage extending from an exhaust manifold 37 of the engine 30 to the inlet port of the turbine 33, an exhaust bypass valve 39 is installed, which closes or opens an exhaust bypassway 38 bypassing the turbine 33, and at this time the opening of this bypass valve 39 is adjusted to control supercharging pressure to the compressor 32.

Inventors

• 👤 Yuji Hirabayashi
• 👤 平林　雄二

Bibliographic Details