Patent ID: 7216479

Claim:
A brake control method for an exhaust emission control system for a vehicle internal combustion engine, the internal combustion engine being adapted to supply fuel into a combustion chamber during an expansion stroke to increase an exhaust gas temperature to promote exhaust purification, comprising: detecting an actual brake force correlation value of an actual braking force that can be actually generated by a vacuum brake booster; determining a required braking force correlation value of a required braking force required to be generated by the vacuum brake booster based on at least one of a vehicle inclination and a stroke of a brake pedal depressed by a driver; and restricting an exhaust emission purification promoting operation of an exhaust emission purification promoting device for promoting purification of exhaust emitted from the internal combustion engine, by controlling an opening and closing valve provided in an exhaust passage for selectively controlling an amount of flow of an exhaust in an exhaust passage, such that negative pressure developed in an air intake system of the internal combustion engine approximates an atmospheric pressure, and the supply of fuel during the expansion stroke, when the correlation value of the determined required braking force is greater than the correlation value of the actual braking force.