| 摘要 |
To reliably establish a shift in a hydraulic pressure control device for an automatic transmission in which a control valve applies a control pressure, by way of a shift valve, to a plurality of friction engaging elements, the hydraulic pressure control device is designed to establish an intermediate shift pattern. The hydraulic pressure control device includes an electronic control unit that establishes shift pattern 3 to produce the second and third gear stages and shift pattern 5 to produce the third, fourth and fifth gear stages in which ON-OFF solenoid valves under energization are combined to produce both the second and third gear stages. The hydraulic pressure control device also establishes shift pattern 4 during the transfer from shift pattern 3 to shift pattern 5 which prevents application of the control pressure from one of the control valves supplying control pressure to one of the friction engaging elements in the shift pattern 3, with the ON-OFF solenoid valves under energization being combined to produce the third gear stage.
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