| 摘要 |
PURPOSE: An atmospheric pressure remaining device of a brake booster is provided to improve operation of the brake booster by flowing air into an atmospheric chamber through an impeller in lowering pressure while traveling at the high land. CONSTITUTION: An atmosphere inlet pipe(11) operating the atmospheric pressure and an air supply pipe(12) forcibly flowing air are connected in parallel in an atmospheric chamber(3) divided by a power piston(4) of a power cylinder(1), and an opening/closing valve(13) is installed movably to the pipes to open and close the air supply pipe or the atmospheric inlet pipe. An impeller(14) is installed to the air supply pipe to blow external air. A control unit(15) opens the air supply pipe with the opening valve in lowering pneumatic pressure of the atmospheric chamber less than atmospheric pressure, and applies power to the impeller to supply air to the atmospheric chamber with the impeller by closing the atmospheric inlet pipe.
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