发明授权
US4949597A Hydraulic system for controlling shift in automatic transmission 失效
用于控制自动变速箱换档的液压系统

Hydraulic system for controlling shift in automatic transmission
摘要:
A single sequence valve is connected to a 3-4 shift valve thereby defining a drain circuit. The sequence valve is responsive to hydraulic pressures which act on a fourth speed apply chamber of a band brake and a high clutch, respectively. The sequence valve normally defines the drain circuit, but delivers hydraulic fluid to the 3-4 shift valve, then to the fourth speed apply chamber of the band brake after a command for a 4-2 downshift has taken place until the hydraulic pressure in the high clutch drops to a predetermined value.
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