Patent ID: 6694734
Filing Date: 2004-02-24
Classification: F02B,F02D,F02M,Y02T

Abstract:
A variable displacement supercharging system, comprising:a supercharger mounted on an engine; a flow passage area changing unit mounted on the supercharger and capable of changing an area of an exhaust gas flow passage leading towards a turbine of the supercharger; a command unit which commands the flow passage area changing unit to change the area of the exhaust gas flow passage such that the exhaust gas flow passage area assumes at least one of a maximum flow passage area and a minimum flow passage area based on an engine rotational speed and an engine load; a supercharging pressure detection unit which detects a supercharging pressure to the engine; an engine rotational speed detection unit which detects the engine rotational speed; an engine load detection unit which detects the engine load; a memory which stores target supercharging pressure values determined based on the engine rotational speed and the engine load; and an abnormality determination unit that determines an abnormality of the supercharger by comparing the target supercharging pressure, determined from the memory based on the detected engine rotational speed and the detected engine load, with the detected supercharging pressure, when the flow passage area change unit changes the flow passage area to assume one of the maximum flow passage area and the minimum flow passage area based on a command by the command means.