| 摘要 |
<p>PURPOSE: A line pressure control system for an automatic transmission is provided to form line pressure stably by a regulator valve, to cut down expenses by simplifying the structure, and to improve freedom of design by reducing the length of the system. CONSTITUTION: A line pressure control system of an automatic transmission is composed of a regulator valve(23) controlling line pressure(f) according to P,N,D,3,2 and L-ranges by receiving hydraulic pressure from an oil pump(21). The oil pump generates hydraulic pressure with driving in actuating an engine. The regulator valve controls line pressure with balance between the resultant force of variable control pressure(g) and an elastic member(25) and the resultant force of line pressure and P,N,D,3,2 and L range pressure(h). Variable control pressure is controlled by a solenoid valve(27), and line pressure is operated in driving the oil pump. Line pressure is regulated stably, and expenses are reduced with simple structure.</p> |
