发明名称 |
Vacuum booster apparatus and a brake apparatus |
摘要 |
A vacuum booster apparatus used for a brake apparatus positively decreases a degree of opening of a throttle valve when it is required while an unnecessary decrease in the degree of opening of the throttle valve is positively prevented. A first pressure chamber of a vacuum booster is connected to an intake pipe of the engine on a downstream side of a throttle valve. A second pressure chamber of the vacuum booster is selectively connectable to one of the first pressure chamber and atmosphere. The vacuum booster boosts an operating force applied to a brake operating member based on a pressure difference between the first pressure chamber and the second pressure chamber. A throttle-opening-degree control device controls a negative pressure in the first pressure chamber by controlling the degree of opening of the throttle valve. The throttle-opening-degree control device decreases the degree of opening of the throttle valve only for a limited time when the negative pressure in the first pressure chamber is smaller than a predetermined necessary negative pressure determined by an operating-force relating amount related to the operating force applied to the brake operating member.
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申请公布号 |
US2002060496(A1) |
申请公布日期 |
2002.05.23 |
申请号 |
US20020046178 |
申请日期 |
2002.01.16 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
MIZUTANI YASUJI;SUZUKI MOTOSHI;NITTA HIROFUMI |
分类号 |
B60W10/04;B60T8/48;B60T13/52;B60T13/66;B60T13/68;B60T13/72;B60T17/00;B60W10/06;B60W10/18;B60W10/184;F02D9/02;F02D11/10;F02D29/02;(IPC1-7):B60T8/44 |
主分类号 |
B60W10/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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