Patent ID: 7475951

Claim:
A control system for a brake vacuum pump, the system performing the driving control of the vacuum pump that is connected to a vacuum chamber of a brake booster into which a negative pressure occurring in an intake manifold of an engine is introduced, and that assists the introduction of the negative pressure into the vacuum chamber, the system comprising: intake pipe relative pressure detecting means for determining an intake pipe relative pressure, which is a differential pressure between the intake pipe negative pressure in the intake manifold and the atmospheric pressure; booster relative pressure detecting means for determining a booster relative pressure, which is a differential pressure between the negative pressure in the vacuum chamber and the atmospheric pressure; and pump operation determining means for operating the vacuum pump when the intake pipe relative pressure is higher than a preset first threshold value and simultaneously the booster relative pressure is higher than a preset second threshold value, and wherein the first threshold value is set to a low value relative to the second threshold value.