Patent ID: 6773374
Filing Date: 2004-08-10
Classification: B60T,F02D,Y10T

Abstract:
A brake negative pressure control apparatus for an internal combustion engine of an in-cylinder direct fuel injection type which is configured to set a combustion mode to a stratified combustion or a homogeneous stoichiometric combustion based on a required output in accordance with at least an opening of an accelerator pedal and an operating condition of said internal combustion engine, and is equipped with a brake booster for increasing a braking force of a brake with a negative pressure introduced from an intake pipe, said apparatus comprising:negative pressure detecting means for detecting a negative pressure within said brake booster; combustion mode setting disabling means for disabling said combustion mode to be set to said stratified combustion when the detected negative pressure is lower than a first predetermined negative pressure; and control means for controlling a throttle valve opening in accordance with a target throttle valve opening in a homogeneous combustion mode when said combustion mode setting disabling means disables said combustion mode to be set to the stratified combustion.