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发明公开
CN101608685A 自动变速器 有权 转让

自动变速器
摘要：
本发明涉及一种自动变速器，其不需要学习控制而实现自D档位向N档位切换时被释放的低速制动器的释放响应性和防止冲击这两者。低速制动器具备第一、第二活塞和对应于各活塞的第一、第二液压室，具有只可切换第一液压室的工作油的排出速度的第一切换阀，在油温从低温到极低温区域中，仅在从自D档位向N档位的开始切换时点到传递转矩开始变化之前的一定时间内，用第一切换阀增大工作油的排出速度，在极其低温区域中，直到释放结束都为增大排出速度的状态。由此，尽管温度引起的粘度变化，也能够增大低速制动器的释放，并且增大工作油的排出的只是第一液压室部分，因此对工作油整体的影响小，可抑制冲击发生。
摘要（英）：

An automatic transmission includes: a frictional engagement element arranged to be switched from an engagement state to a disengagement state at a switching from a running range to a neutral range, and including: frictional plates; a first piston arranged to push the frictional plates; a second piston arranged to push the frictional plates; a first hydraulic chamber arranged to receive a hydraulic fluid for pushing the first piston; and a second hydraulic chamber arranged to receive a hydraulic fluid for pushing the second piston; a first discharge speed switching section arranged to switch only a discharge speed of the hydraulic fluid of the first hydraulic chamber; and a control unit configured to increase the discharge speed of the hydraulic fluid of the first hydraulic chamber during a predetermined time period by the first discharge speed switching section at the switching from the running range to the neutral range.

公开/授权文献
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