Patent ID: 6929584

Claim:
A hydraulic pressure control apparatus for an automatic transmission for a vehicle, comprising: a plurality of hydraulic friction engaging devices which are selectively operated to selectively establish a speed of the automatic transmission; a plurality of electromagnetic control valve devices which change a combination of the plurality of hydraulic friction engaging devices being operated so as to selectively establish a first predetermined speed and a second predetermined speed; a driving state switching valve switched by an operation by a driver, which switches a driving state of the automatic transmission by supplying a hydraulic fluid fed under pressure from a hydraulic pump to a predetermined hydraulic fluid path; and a switching valve which is switched from a first position to a second position according to a change in a position of the driving state switching valve when all of the plurality of electromagnetic control valve devices stop working, the switching valve operating the hydraulic friction engaging devices in a combination to establish the first predetermined speed when in the first position, and in a combination to establish the second predetermined speed when in the second position.