| 摘要 |
<p>A hydraulic control for automatic gear-box for motor vehicles comprises shifting valves (1, 10, 100) for applying a working pressure to the shift couplings/brakes (A, C'). The shifting points of the shifting valves and the working pressure depend on the load of the motor (position of the accelerator pedal) and on the speed and are applied as control pressures (choke and regulation pressures) to the shifting valves (1, 10, 100). To improve the shifting quality in vehicles with supercharged engines, the intake pressure (PL, lines 61, 71) is applied to at least one additional shifting valve either directly (61) as a control pressure or via a pressure transformer (pressure transducer 7). The intake pressure (PL) is transmitted to the spring room (15, 150) of the shifting valve so as to maintain the spring pressure against the piston and to increase the application pressure for the brake or clutch to be released.</p> |
