Patent ID: 7848868
Filing Date: 2010-12-07
Classification: F02D,F02M,Y10T

Abstract:
1. A control apparatus for a pressure reducing valve provided with a fuel accumulating device of a fuel injection system mounted on a vehicle for injecting the fuel into an internal combustion engine installed in the vehicle and is actuated in order to discharge a fuel accumulated in the fuel accumulating device in response to a command signal with a delay time being defined as an interval between a time when the command signal is outputted from a control unit of the fuel injection system and a further time when the pressure reducing valve starts to move for adjusting a degree of opening thereof, the control apparatus comprising: engine condition detecting means for detecting either an operating state or an operating condition of the internal combustion engine, either the operating state or the operating condition at least including fuel pressure in the fuel accumulating device sequentially; target reducing time estimating means for estimating a target reducing time when the fuel pressure in the fuel accumulating device reaches at a predetermined target value of the fuel pressure in the fuel accumulating device; delay time estimating means for estimating the delay time in accordance with either the operating state or the operating conditions of the internal combustion engine detected by the engine condition detecting means; a time distance estimating means for estimating a time distance which needs until the fuel pressure in the fuel accumulating device reaches the target value; and a valve control command outputting means for outputting the command signal to the pressure reducing valve to adjust the degree of opening of the pressure reducing valve when the time distance estimated by the time distance estimating means becomes to be shorter than the delay time estimated by the delay time estimating means such that the pressure reducing valve starts to change the degree of opening thereof when the fuel pressure in the fuel accumulating device arrives at the target value.