| 摘要 |
PROBLEM TO BE SOLVED: To change brake pressure smoothly with simple constitution. SOLUTION: In the brake pressure control device, when a first directional control valve 16 is in the state wherein a brake fluid pressure output means is communicated to a first liquid pressure passage 21 and a wheel brake BR is communicated to a second liquid pressure passage 22, a second directional control valve 17 is switchingly controlled to switch the state wherein a third liquid pressure passage 23 connected to a plunger pump 5B is communicated to the first liquid pressure passage 21 and a fourth liquid pressure passage 24 connected to the plunger pump 5B in parallel with the third liquid pressure passage 23 is communicated to the second liquid pressure passage 22 and the state wherein the third liquid pressure passage 23 is communicated to the second liquid pressure passage 22 and the fourth liquid pressure passage 24 is communicated to the first liquid pressure passage 21, a first one-way valve 18 allowing circulation of brake fluid to the plunger pump 5B side is interposed in the third liquid pressure passage 23, and a second one-way valve 19 allowing circulation of brake fluid from the plunger pump 5B is interposed in the fourth liquid pressure passage 24. COPYRIGHT: (C)2009,JPO&INPIT
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