The invention discloses a method for judging and controlling air leakage of a
brake system. The method comprises the following steps: starting self-inspection; if yes, the air pressure of the
brake air tank uploaded by the air
pressure sensor is received; judging whether the air pressure of the
brake air tank reaches a driving permitting condition or not; if yes, allowing the vehicle READY, or not allowing the vehicle READY; whether the air pressure of the brake air tank meets the
air pump closing condition or not is judged, if yes, the VCU instructs the
air pump to continue working, and if not, the VCU instructs the
air pump to stop working; judging whether the working time is greater than a time threshold set by the VCU or not; if yes, the VCU sends an inflation
timeout alarm to the instrument through the
CAN bus, and otherwise, the VCU instructs the air pump to continue working; judging whether the actual vehicle speed is smaller than a vehicle speed threshold
value set by the VCU or not; if yes, the VCU instructs the air pump to stop working; otherwise, vehicle READY is allowed; by the adoption of the technical scheme, it is ensured that braking air pressure exists in the traveling process, and traveling safety is improved.